EP0089673A1
Expired / Lapsed
EP
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A circuit and a method for processing amplitude and phase variable multiphase signals which are required as current or voltage reference to drive synchronous motors
Assignee: SP EL Srl
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Filing: 1983-03-22
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Granted: —
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Expires: 2003-03-22
Abstract
Abstract This invention relates to a circuit and to a method for processing amplitude and phase variable multiphase signals, which are required as current or voltage reference to drive electric motors, comprising a synchro-resolver angular position trasducer (11), rigidly connected with a synchronous motor (10) with the same polar configuration and number of poles thereof, according to which the analog signals detected by said transducer (11) are modulated, demodulated and outputted out of phase by 90° with the signals relating to the roating magnetic field. The circuit moreover comprises a phase shifter device (14) and means (15) for modifying the amplitude of signals out-putted by said transducer (11) as a function of at least one control signal. The resultant of the signals processed by said means (14, 15) is supplied to an amplifier (19) to generate in the stator currents of determined amplitude and phases for driving said motor (10) complying with the magnetic laws thereof.
Inventors
- 👤 Luciano Franzolini
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 21:16
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/024
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
143 words
A circuit for generating amplitude and phase variable multiphase signals, which are required as current or voltage reference to drive any electric synchronous motor comprising: a multiphase angular position transducer of precision synchro-resolver type, rigidly connected with a synchronous motor, with the same polar configuration and number of poles as said motor but with the polar axis mechanically out of phase by 90°, the analog detected signals of which are modulated, demodulated and outputted from said transducer device, a phase shifter device and means for modifying the amplitude and polarity of the signals out putted by said transducer on the basis of at least one control signal; an amplifier supplied with the resultant of the signals sensed by said means for generating in the stator currents of determined amplitude and phase to drive said motor, complying with the magnetic laws of the latter.
Claim 2
Dependent Claim
143 words
A circuit for generating amplitude and phase variable multiphase signals, which are required as current or voltage reference to drive any electric synchronous motor comprising: a multiphase angular position transducer of precision synchro-resolver type, rigidly connected with a synchronous motor, with the same polar configuration and number of poles as said motor but with the polar axis mechanically out of phase by 90°, the analog detected signals of which are modulated, demodulated and outputted from said transducer device, a phase shifter device and means for modifying the amplitude and polarity of the signals out putted by said transducer on the basis of at least one control signal; an amplifier supplied with the resultant of the signals sensed by said means for generating in the stator currents of determined amplitude and phase to drive said motor, complying with the magnetic laws of the latter.
Claim 3
Dependent Claim
30 words
A circuit according to Claim 1, characterized in that the precision resolver type of angular position transducer of two-phase type is followed by a Scott transformer for three- phase conversion.
Claim 4
Dependent Claim
28 words
A circuit according to Claim 1, characterized in that in case of two-phase motors, the precision synchro type of angular position transducer is connected to a Scott transformer.
Claim 5
Dependent Claim
35 words
A circuit according to Claim 1, characterized in that said phase shifter device includes a circuit comprising impedances and at least one changeover switch element for each phase under the control of a digital signal.
Claim 6
Dependent Claim
23 words
A circuit according to Claim 1, characterized in that said signal amplitude modifying means comprise at least one amplitude modulating or multiplying element.
Claim 7
Dependent Claim
17 words
A circuit according to Claim 3, characterized in that said multiplying element is arranged downstream the transducer.
Claim 8
Dependent Claim
36 words
A circuit according to Claim 5, characterized in that said multiplying element is arranged upstream the transducer, that is for modifying the amplitude of said carrier for said transducer and accordingly of the signals subsequently outputted.
Claim 9
Independent Claim
158 words
A method to be carried out in a circuit for generating amplitude and phase variable multiphase signals, which are required as current or voltage reference to drive electric synchronous motors, characterized in that the initial mechanical phase shifting at 90° between the motor rotor and the synchro-resolver type of the used multiphase angular position transducer is carried out by the sequence of the following steps: (a) by a suitable digital control (CL) the phase shifter device (14) is operated on so as to shift the phases outputted from said transducer and suitably processed; (b) the polar axis of the transducer is locked and the motor rotor is allowed to freely rotate; (c) the motor is energized still allowing said rotor to freely rotate until aligned with that of the stator and stops as the torque is zero; (d) the polar axes of the rotor transducer are locked; and (e) the state of the displacement digital control is modified.
Claim 10
Independent Claim
158 words
A method to be carried out in a circuit for generating amplitude and phase variable multiphase signals, which are required as current or voltage reference to drive electric synchronous motors, characterized in that the initial mechanical phase shifting at 90° between the motor rotor and the synchro-resolver type of the used multiphase angular position transducer is carried out by the sequence of the following steps: (a) by a suitable digital control (CL) the phase shifter device (14) is operated on so as to shift the phases outputted from said transducer and suitably processed; (b) the polar axis of the transducer is locked and the motor rotor is allowed to freely rotate; (c) the motor is energized still allowing said rotor to freely rotate until aligned with that of the stator and stops as the torque is zero; (d) the polar axes of the rotor transducer are locked; and (e) the state of the displacement digital control is modified.
References Cited (Backward Citations)
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