US3723718A — Simulation through rotating coordinate transforma…

Claim 1

Independent Claim 191 words

In a method for simulating the dynamic electromechanical behavioral characteristics of a rotating electrical machine, said characteristics being the electromechanical response of the machine as a function of electrical and mechanical inputs thereto and the machine parameters, comprising providing input signals which represent said electrical and mechanical inputs to said machine, deriving a modulation signal representing the departure of the rotor of said machine from its normal rotational speed, modulating an oscillator with said modulation signal to generate electrical output signals which contain phase modulated sines and cosines about a carrier frequency which is the analog of the scheduled rotor speed of said machine and have a phase modulation which is the analog of a mechanical phase angle of the rotor of said machine, and demodulating certain of said input signals relative to said output signals from said oscillator to provide additional output signals which represent the amplitude and the sine and cosine of the relative phase angle between the electrical and mechanical variables of said machine, said additional output signals representing the stator phase-winding variable of said machine resolved into a reference frame fixed with respect to the rotor thereof.

Claim 2

Dependent Claim 191 words

In a method for simulating the dynamic electromechanical behavioral characteristics of a rotating electrical machine, said characteristics being the electromechanical response of the machine as a function of electrical and mechanical inputs thereto and the machine parameters, comprising providing input signals which represent said electrical and mechanical inputs to said machine, deriving a modulation signal representing the departure of the rotor of said machine from its normal rotational speed, modulating an oscillator with said modulation signal to generate electrical output signals which contain phase modulated sines and cosines about a carrier frequency which is the analog of the scheduled rotor speed of said machine and have a phase modulation which is the analog of a mechanical phase angle of the rotor of said machine, and demodulating certain of said input signals relative to said output signals from said oscillator to provide additional output signals which represent the amplitude and the sine and cosine of the relative phase angle between the electrical and mechanical variables of said machine, said additional output signals representing the stator phase-winding variable of said machine resolved into a reference frame fixed with respect to the rotor thereof.

Claim 3

Dependent Claim 27 words

A method as in claim 1 including applying said additional output signals through circuit means to derive said modulation signal as a feedback signal for said oscillator.

Claim 4

Dependent Claim 225 words

In a method for simulating the dynamic electromechanical behavioral characteristics of a rotating electrical machine, said characteristics being the electromechanical response of the machine as a function of electrical and mechanical inputs thereto and the machine parameters, comprising providing input signals which represent said electrical and mechanical inputs to said machine applying modulation signals to an oscillator which are derived from at least one signal which is the analog of a mechanical input to said machine causing said oscillator to generate electrical output signals which contain phase modulated sinusoids about a carrier frequency which is the analog of the scheduled rotor speed of said machine and have a phase modulation which is the analog of the mechanical phase angle of the rotor of said machine, demodulating at least one signal representing a stator electrical inpUt to said machine with respect to said sinusoids, and deriving an additional output signal representing said stator electrical input signal referred to the rotor of said machine, deriving from said additional output signal, and at least one of said input signals representing a rotor variable of said machine, interaction signals representing the electrical and mechanical interaction of said machine, one of said interaction signals being representative of the departure of the rotor of said machine from its normal rotational speed and being applied as the modulation signal to said oscillator.

Claim 5

Dependent Claim 225 words

In a method for simulating the dynamic electromechanical behavioral characteristics of a rotating electrical machine, said characteristics being the electromechanical response of the machine as a function of electrical and mechanical inputs thereto and the machine parameters, comprising providing input signals which represent said electrical and mechanical inputs to said machine applying modulation signals to an oscillator which are derived from at least one signal which is the analog of a mechanical input to said machine causing said oscillator to generate electrical output signals which contain phase modulated sinusoids about a carrier frequency which is the analog of the scheduled rotor speed of said machine and have a phase modulation which is the analog of the mechanical phase angle of the rotor of said machine, demodulating at least one signal representing a stator electrical inpUt to said machine with respect to said sinusoids, and deriving an additional output signal representing said stator electrical input signal referred to the rotor of said machine, deriving from said additional output signal, and at least one of said input signals representing a rotor variable of said machine, interaction signals representing the electrical and mechanical interaction of said machine, one of said interaction signals being representative of the departure of the rotor of said machine from its normal rotational speed and being applied as the modulation signal to said oscillator.

Claim 6

Dependent Claim 132 words

In a method for simulating dynamic electromechanical behavioral characteristics of a rotating electrical machine by applying electrical signals to a simulation system, said characteristics being the electromechanical response of the machine as a function of electrical and mechanical inputs thereto and the machine parameters, comprising providing electrical signals representing rotating electrical machine variables from groups of rotating electrical machine variables, said groups of variables comprising (a) stator voltage and current, (b) rotor field voltage and current, and (c) rotor torque and speed, applying to said system, which includes oscillator and demodulator circuit means, electrical signals representing one variable from each of said groups (a), (b) and (c) of variables, and deriving from said system electrical signals as outputs which are the other variables from said groups (a), (b) and (c) of variables.

Claim 7

Dependent Claim 132 words

In a method for simulating dynamic electromechanical behavioral characteristics of a rotating electrical machine by applying electrical signals to a simulation system, said characteristics being the electromechanical response of the machine as a function of electrical and mechanical inputs thereto and the machine parameters, comprising providing electrical signals representing rotating electrical machine variables from groups of rotating electrical machine variables, said groups of variables comprising (a) stator voltage and current, (b) rotor field voltage and current, and (c) rotor torque and speed, applying to said system, which includes oscillator and demodulator circuit means, electrical signals representing one variable from each of said groups (a), (b) and (c) of variables, and deriving from said system electrical signals as outputs which are the other variables from said groups (a), (b) and (c) of variables.

Claim 8

Dependent Claim 53 words

In a method as in claim 4 wherein said variables are alternator variables, and said system includes a plurality of said circuit means interconnected therein, and input signals are applied to said system representing variables of a plurality of interconnected alternators for simulating the dynamic electromechanical behavioral characteristics of a plurality of alternators.

Claim 9

Dependent Claim 110 words

In a method for simulating a rotating electrical machine through the application of input signals to a system including interconnected coordinate transformation means and electronic circuit means comprising providing input signals representative of electrical and mechanical inputs supplied to said machine by mechanical and electrical connections exterior to said machine, applying said input signals to said system including interconnected coordinate transformation means and electronic circuit means, and generating electrical signals which represent variables of said electrical machine, and deriving from said system electrical signals indicative of resultant operational behavior of said machine in the form of electromechanical response thereof to said electrical and mechanical inputs and parameters of said machine.

Claim 10

Dependent Claim 110 words

In a method for simulating a rotating electrical machine through the application of input signals to a system including interconnected coordinate transformation means and electronic circuit means comprising providing input signals representative of electrical and mechanical inputs supplied to said machine by mechanical and electrical connections exterior to said machine, applying said input signals to said system including interconnected coordinate transformation means and electronic circuit means, and generating electrical signals which represent variables of said electrical machine, and deriving from said system electrical signals indicative of resultant operational behavior of said machine in the form of electromechanical response thereof to said electrical and mechanical inputs and parameters of said machine.

Claim 11

Dependent Claim 56 words

In a method as in claim 6 wherein said coordinate transformation means includes an oscillator, and said oscillator is modulated as a function of a mechanical input to said machine and generates electrical signals which contain information pertaining to trigonometric functions of the angle of the rotor of said machine relative to a fixed reference frame.

Claim 12

Dependent Claim 54 words

In a method as in claim 7 wherein said coordinate transformation means further includes a demodulator, and the output of said oscillator is applied as a reference input to said demodulator, and said input signals to said system include signals representing a stator electrical variable of said machine and are applied to said demodulator.

Claim 13

Dependent Claim 84 words

In a method as in claim 6 wherein said input signals represent machine variables from groups of machine variables, said groups of variables comprising, (a) stator voltage and current, (b) rotor field voltage and current, and (c) rotor torque and speed, input signals representative of one variable from each of said groups (a), (b), and (c) of variables are applied to said system, and said electrical signals derived from said system are the other variables from said groups (a), (b), and (c) of variables.

Claim 14

Dependent Claim 123 words

In a method for simulating the dynamic electromechanical behavioral characteristics of a rotating electrical machine utilizing a new use of a phase-locked-loop circuit, said characteristics being the electromechanical response of the machine as a function of electrical and mechanical inputs thereto and the machine parameters, comprising the steps of providing electrical input signals indicative of electrical and mechanical inputs to the rotating electrical machine, deriving additional signals from said input signals, applying said additional signals to a phase-locked-loop circuit, said phase-locked-loop circuit comprising an interconnected oscillator, demodulator and feedback circuit, certain of said additional signals being applied to said oscillator and to said demodulator, and deriving from said phase-locked-loop circuit output signals for providing an indication of the behavioral characteristics of said machine.

Claim 15

Dependent Claim 123 words

In a method for simulating the dynamic electromechanical behavioral characteristics of a rotating electrical machine utilizing a new use of a phase-locked-loop circuit, said characteristics being the electromechanical response of the machine as a function of electrical and mechanical inputs thereto and the machine parameters, comprising the steps of providing electrical input signals indicative of electrical and mechanical inputs to the rotating electrical machine, deriving additional signals from said input signals, applying said additional signals to a phase-locked-loop circuit, said phase-locked-loop circuit comprising an interconnected oscillator, demodulator and feedback circuit, certain of said additional signals being applied to said oscillator and to said demodulator, and deriving from said phase-locked-loop circuit output signals for providing an indication of the behavioral characteristics of said machine.

Claim 16

Dependent Claim 129 words

In a method for simulating the dynamic electromechanical behavioral characteristics of a rotating electrical machine utilizing a new use of an oscillator and demodulator circuit as a rotating coordinate transformer, said characteristics being the electromechanical response of the machine as a function of electrical and mechanical inputs thereto and the machine parameters, comprising the steps of providing electrical input signals indicative of electrical and mechanical inputs to the rotating electrical machine, deriving additional signals from said input signals, applying said additional signals to an interconnected oscillator and demodulator circuit forming a rotating coordinate transformer, certain of said additional signals being applied to the oscillator and to the demodulator of said circuit, and deriving from said circuit output signals for providing an indication of the behavioral characteristics of said machine.

Claim 17

Dependent Claim 129 words

In a method for simulating the dynamic electromechanical behavioral characteristics of a rotating electrical machine utilizing a new use of an oscillator and demodulator circuit as a rotating coordinate transformer, said characteristics being the electromechanical response of the machine as a function of electrical and mechanical inputs thereto and the machine parameters, comprising the steps of providing electrical input signals indicative of electrical and mechanical inputs to the rotating electrical machine, deriving additional signals from said input signals, applying said additional signals to an interconnected oscillator and demodulator circuit forming a rotating coordinate transformer, certain of said additional signals being applied to the oscillator and to the demodulator of said circuit, and deriving from said circuit output signals for providing an indication of the behavioral characteristics of said machine.

Claim 18

Dependent Claim 54 words

A method as in claim 11 wherein the modulation input of said oscillator of said circuit is derived from signals representing mechanical data of said machine, the signals applied to the demodulator of said circuit are derived from signals representing electrical data of said machine, and said output signals are derived from said demodulator.

Claim 19

Dependent Claim 83 words

In a method for simulating the rotation of the rotor of an electrical machine comprising providing an input signal representing the departure of said rotor from its normal rotational speed, and modulating an oscillator with said input signal, said oscillator having a center frequency which represents the normal rotational speed of said rotor, thereby generating from said oscillator an electrical signal which contains a sinusoid of the angle between a fixed reference frame and the reference frame of the rotor of said machine.

Claim 20

Dependent Claim 83 words

In a method for simulating the rotation of the rotor of an electrical machine comprising providing an input signal representing the departure of said rotor from its normal rotational speed, and modulating an oscillator with said input signal, said oscillator having a center frequency which represents the normal rotational speed of said rotor, thereby generating from said oscillator an electrical signal which contains a sinusoid of the angle between a fixed reference frame and the reference frame of the rotor of said machine.

Claim 21

Dependent Claim 91 words

In a method as in claim 13 further simulating the transformation of an electrical variable in the reference frame of the stator of said electrical machine to the reference frame of the rotor thereof, comprising providing a second input signal representing said stator electrical variable, applying said second input signal as an input to a demodulator, applying the output of said oscillator as a reference signal to said demodulator, and deriving as the output from said demodulator an electrical signal representing the transformation of said stator electrical variable to said rotor.

Claim 22

Dependent Claim 90 words

In a method as in claim 13 further simulating the transformation of an electrical variable in the reference frame of said rotor to the reference frame of the stator of said electrical machine, comprising generating a second input signal representing said rotor electrical variable, applying said second input signal as an input to a demodulator, applying the output of said oscillator as a reference signal to said demodulator, and deriving as the output from said demodulator an electrical signal representing the transformation of said rotor electrical variable to said stator.

Claim 23

Dependent Claim 58 words

In a method as in claim 14 wherein interaction between the rotor and stator electrical variables is simulated wherein said input signal representing the departure of said rotor from its normal rotational speed is generated in response to the output of said demodulator and applied as feedback to said oscillator for providing the modulating signal for said oscillator.

Claim 24

Dependent Claim 65 words

In a method as in claim 14 wherein interaction between the rotor and stator electrical variables is simulated wherein said input signal representing the departure of said rotor from its normal rotational speed is generated in response to the output of said demodulator by circuit means and is applied as feedback to said oscillator to cause said oscillator and demodulator to function as a phase-locked-loop.

Claim 25

Dependent Claim 127 words

In a simulation system for simulating dynamic electromechanical behavioral characteristics of an electrical alternator, comprising modulated oscillator means for modulating the signals applied thereto with respect to a center frequency and providing a reference output, demodulator means for demodulating input signals applied thereto and receiving said reference output of said oscillator means, a plurality of computing components interconnecting said oscillator and demodulator to form a computational circuit, means coupled with said circuit for applying electrical input signals thereto indicative of electrical and mechanical inputs to said alternator imposed by mechanical and electrical connections external to said alternator, and means coupled with said circuit for deriving therefrom electrical signals which are a function of said input signals and indicative of resulting electromechanical behavioral characteristic response of said alternator.

Claim 26

Dependent Claim 127 words

In a simulation system for simulating dynamic electromechanical behavioral characteristics of an electrical alternator, comprising modulated oscillator means for modulating the signals applied thereto with respect to a center frequency and providing a reference output, demodulator means for demodulating input signals applied thereto and receiving said reference output of said oscillator means, a plurality of computing components interconnecting said oscillator and demodulator to form a computational circuit, means coupled with said circuit for applying electrical input signals thereto indicative of electrical and mechanical inputs to said alternator imposed by mechanical and electrical connections external to said alternator, and means coupled with said circuit for deriving therefrom electrical signals which are a function of said input signals and indicative of resulting electromechanical behavioral characteristic response of said alternator.

Claim 27

Dependent Claim 99 words

In a system as in claim 18 wherein said oscillator means comprises a voltage controlled oscillator, said demodulator means comprises a phase detector, said computing components comprise first and second amplifiers and first and second multipliers, said phase detector having an output coupled as an input to the first of said amplifiers and to the first of said multipliers, said first amplifier having an output coupled to the second of said multipliers, and said multipliers having outputs coupled to the second of said amplifiers which has an output coupled to said voltage controlled oscillator for applying modulating signals thereto.

Claim 28

Dependent Claim 60 words

In a system as in claim 19 wherein said computing components further include third and fourth amplifiers, the output of said phase detector is coupled as an input to said third amplifier, the output of which is coupled to said fourth amplifier, and the output of said fourth amplifier is coupled as an input to said first and third amplifiers.

Claim 29

Dependent Claim 68 words

In a system as in claim 20 wherein said means for applying electrical input signals to said system include a plurality of signal input terminals, a first of which is coupled through another amplifier to an input of said phase detector, a second of which is coupled as an input to said fourth amplifier, and a third of which is coupled as an input to said second amplifier.

Claim 30

Dependent Claim 62 words

In a system as in claim 18 wherein said oscillator means comprises a voltage controlled oscillator, said demodulator means comprises first and second phase detectors, and said computing components comprise a plurality of amplifiers and multipliers interconnected with said first and second phase detectors and said voltage controlled oscillator to form two phase-locked-loops, both of said loops including said voltage controlled oscillator.

Claim 31

Dependent Claim 173 words

In a system as in claim 22 wherein the first of said phase-locked-loops includes said first phase detector, said voltage controlled oscillator, first and second amplifiers, and first and second multipliers, said first phase detector having an output coupled as an input to the first of said amplifiers and to the first of said multipliers, said fIrst amplifier having an output coupled to the second of said multipliers, the second of said phase-locked-loops includes said second phase detector, said voltage controlled oscillator, said second amplifier, said first and second multipliers, and a third amplifier, said second phase detector having an output coupled as an input to said third amplifier and to the second multiplier, and said third amplifier having an output coupled to said first multiplier, and said multipliers having outputs coupled to said second amplifier which has an output coupled to said voltage controlled oscillator for applying modulating signals thereto, and said voltage controlled oscillator has an output applied as a reference input to each of said first and second phase detectors.

Claim 32

Dependent Claim 115 words

In a system as in claim 23 including fourth and fifth amplifiers coupled with said first phase-locked-loop, the output of said first phase detector being coupled as an input to said fourth amplifier, the output of which is coupled to said fifth amplifier, and the output of said fifth amplifier being coupled as an input to said first and fourth amplifiers, and sixth and seventh amplifiers coupled with said second phase-locked-loop, the output of said second phase detector being coupled as an input to said sixth amplifier, the output of which is coupled to said seventh amplifier, and the output of said seventh amplifier being coupled as an input to said third and sixth amplifiers.

Claim 33

Dependent Claim 71 words

In a system as in claim 24 wherein said means for applying electrical input signals to said system include a plurality of signal input terminals, a first of which is coupled through another amplifier to an input of said first and second phase detectors, a second of which is coupled as an input to said fifth amplifier, and a third of which is coupled as an input to said second amplifier.

Claim 34

Dependent Claim 59 words

In a simulation system as in claim 25 wherein said means coupled with said system for deriving therefrom electrical signals which are a function of said input signals includes multiplier and amplifier means coupled with the output of said voltage controlled oscillator, and includes an output terminal of said second amplifier and an output terminal of said fourth amplifier.

Claim 35

Dependent Claim 140 words

In a system for simulating the dynamic electromechanical behavioral characteristics of a rotating electrical machine comprising means for supplying a plurality of electrical input signals, said electrical input signals being representative of electrical and mechanical inputs supplied to said machine by mechanical and electrical connections exterior to said machine, phase-locked-loop circuit means for receiving and processing said plurality of electrical input signals and for providing an analog simulation of the electromechanical response of said machine, said phase-locked-loop circuit means including an oscillator and demodulator, both of which receive additional signals which are derived from certain of said electrical input signals, and means for deriving from said phase-locked-loop circuit means electrical output signals indicative of the resulting behavioral characteristics of said machine in the form of the electromechanical response thereof to said electrical and mechanical inputs and parameters of said machine.

Claim 36

Dependent Claim 140 words

In a system for simulating the dynamic electromechanical behavioral characteristics of a rotating electrical machine comprising means for supplying a plurality of electrical input signals, said electrical input signals being representative of electrical and mechanical inputs supplied to said machine by mechanical and electrical connections exterior to said machine, phase-locked-loop circuit means for receiving and processing said plurality of electrical input signals and for providing an analog simulation of the electromechanical response of said machine, said phase-locked-loop circuit means including an oscillator and demodulator, both of which receive additional signals which are derived from certain of said electrical input signals, and means for deriving from said phase-locked-loop circuit means electrical output signals indicative of the resulting behavioral characteristics of said machine in the form of the electromechanical response thereof to said electrical and mechanical inputs and parameters of said machine.

Claim 37

Dependent Claim 126 words

In a system as in claim 27 wherein said oscillator has a center frequency which is representative of the normal rotor speed of said machine, said oscillator being coupled to said demodulator for providing a reference signal output to said demodulator, said electrical input signals including a variable signal representing a coordinate in a primary reference frame, said primary reference frame corresponding to the rotating electromagnetic field of the stator of said machine, said variable signal being supplied to said demodulator resulting in an additional output signal representing a variable in a secondary reference frame of said machine, said secondary reference frame representing the rotOr of said machine, and feedback circuit means for receiving said additional output signal and providing a modulation signal for said oscillator.

Claim 38

Dependent Claim 42 words

In a system as in claim 28 wherein said demodulator includes a phase detector, and said feedback circuit means includes amplifier and multiplier circuit means for receiving said additional output signal from said demodulator and supplying said modulation signal to said oscillator.

Claim 39

Dependent Claim 84 words

In a system as in claim 29 wherein said amplifier and multiplier circuit means comprises first and second amplifiers and first and second multipliers, said phase detector having an output coupled as an input to the first of said amplifiers and the first of said multipliers, said first amplifier having an output coupled to the second of said multipliers, and said multipliers having outputs coupled to the second of said amplifiers which has an output coupled to said oscillator for applying modulating signals thereto.

Claim 40

Dependent Claim 184 words

A rotating coordinate transformer for calculating the transformation of coordinates between a primary reference frame and a secondary reference frame which rotate relative to each other and at least one of which rotates with respect to a fixed reference frame, comprising means for supplying an input signal representing the departure of rotation of the secondary reference frame from its normal rotational speed, modulated oscillator means responsive to said input signal for generating an electrical signal which contains information pertaining to sines and cosines of the angle between the secondary reference frame and the fixed reference frame, said oscillator means generating a center frequency which is representative of the normal rotational speed of said secondary reference frame with respect to said fixed reference frame, means for supplying a signal representing a coordinate in said primary reference frame, and demodulator means having a reference input derived from an output of said oscillator means, and said demodulator means having as an additional input said signal representing a coordinate in said primary reference frame, and providing an output representing the same coordinate transformed to said secondary reference frame.

Claim 41

Dependent Claim 184 words

A rotating coordinate transformer for calculating the transformation of coordinates between a primary reference frame and a secondary reference frame which rotate relative to each other and at least one of which rotates with respect to a fixed reference frame, comprising means for supplying an input signal representing the departure of rotation of the secondary reference frame from its normal rotational speed, modulated oscillator means responsive to said input signal for generating an electrical signal which contains information pertaining to sines and cosines of the angle between the secondary reference frame and the fixed reference frame, said oscillator means generating a center frequency which is representative of the normal rotational speed of said secondary reference frame with respect to said fixed reference frame, means for supplying a signal representing a coordinate in said primary reference frame, and demodulator means having a reference input derived from an output of said oscillator means, and said demodulator means having as an additional input said signal representing a coordinate in said primary reference frame, and providing an output representing the same coordinate transformed to said secondary reference frame.

Claim 42

Dependent Claim 26 words

A rotating coordinate transformer as in claim 31 wherein said modulated oscillator means is a voltage controlled oscillator, and said demodulator means is a phase detector.

Claim 43

Dependent Claim 224 words

A rotating coordinate transformer for calculating the transformation of coordinates between a primary reference frame and a secondary reference frame which rotate relative to each other and at least one of which rotates with respect to a fixed reference frame, comprising means for supplying an input signal representing the departure of rotation of the secondary reference frame from its normal rotational speed, said secondary reference frame being the reference frame of the rotor of a rotating electrical machine, modulated oscillator means responsive to said input signal for generating an electrical signal which contains information pertaining to sines and cosines of the angle between the secondary reference frame and the fixed reference frame, said fixed reference frame being exterior to said machine, said oscillator means generating a center frequency which represents the normal rotational speed of said secondary reference frame with respect to said fixed reference frame, means for supplying a signal representing a coordinate in said primary reference frame, said primary reference frame corresponding to the rotating magnetic field generated by the stator of said machine, and demodulator means having a reference input derived from an output of said oscillator means, and said demodulator means having as an additional input said signal representing a coordinate in said primary reference frame, and providing an output representing the same coordinate transformed to said secondary reference frame.

Claim 44

Dependent Claim 224 words

A rotating coordinate transformer for calculating the transformation of coordinates between a primary reference frame and a secondary reference frame which rotate relative to each other and at least one of which rotates with respect to a fixed reference frame, comprising means for supplying an input signal representing the departure of rotation of the secondary reference frame from its normal rotational speed, said secondary reference frame being the reference frame of the rotor of a rotating electrical machine, modulated oscillator means responsive to said input signal for generating an electrical signal which contains information pertaining to sines and cosines of the angle between the secondary reference frame and the fixed reference frame, said fixed reference frame being exterior to said machine, said oscillator means generating a center frequency which represents the normal rotational speed of said secondary reference frame with respect to said fixed reference frame, means for supplying a signal representing a coordinate in said primary reference frame, said primary reference frame corresponding to the rotating magnetic field generated by the stator of said machine, and demodulator means having a reference input derived from an output of said oscillator means, and said demodulator means having as an additional input said signal representing a coordinate in said primary reference frame, and providing an output representing the same coordinate transformed to said secondary reference frame.

Claim 45

Dependent Claim 143 words

A rotating coordinate transformer comPrising means for supplying a modulation signal representing the departure of a rotating reference frame of a rotating electrical machine from its normal rotational speed, modulated oscillator means responsive to said input signal for generating an electrical signal which contains information pertaining to the sines and cosines of the angle between the rotating reference frame of said rotating electrical machine and a fixed reference frame, said oscillator means having a center frequency which is an analog of the scheduled rotational speed of said rotating reference frame, means for supplying a signal representing a primary reference frame coordinate, and demodulator means having a reference input derived from an output of said oscillator means, and said demodulator means having as an additional input said signal representing a primary reference frame coordinate, and providing an output representing a secondary reference frame coordinate.

Claim 46

Dependent Claim 143 words

A rotating coordinate transformer comPrising means for supplying a modulation signal representing the departure of a rotating reference frame of a rotating electrical machine from its normal rotational speed, modulated oscillator means responsive to said input signal for generating an electrical signal which contains information pertaining to the sines and cosines of the angle between the rotating reference frame of said rotating electrical machine and a fixed reference frame, said oscillator means having a center frequency which is an analog of the scheduled rotational speed of said rotating reference frame, means for supplying a signal representing a primary reference frame coordinate, and demodulator means having a reference input derived from an output of said oscillator means, and said demodulator means having as an additional input said signal representing a primary reference frame coordinate, and providing an output representing a secondary reference frame coordinate.

Claim 47

Dependent Claim 26 words

A coordinate transformer as in claim 34 wherein said rotating reference frame is a secondary reference frame representative of the rotor of said rotating electrical machine.

Claim 48

Dependent Claim 61 words

A coordinate transformer as in claim 34 wherein the coordinate transformation is computed according to the Park coordinate transformation and wherein said rotating reference frame corresponds to the rotor of said machine as a secondary reference frame, and said additional input signal represents a coordinate in the primary reference frame of the rotating electromagnetic field of the stator of said machine.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-03-26	1976-09-25	1977-03-27	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-03-26	1980-09-25	1981-03-27	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-03-26	1984-09-25	1985-03-27	$7700.00	Window Closed / Lapsed

Simulation through rotating coordinate transformation

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