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Patent US6348775B1 successfully refreshed from Google Patents.
US6348775B1
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Drive wave form synchronization for induction motors
Assignee: Borealis Technical Ltd
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Filing: 2000-05-11
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Granted: 2002-02-19
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Expires: 2020-05-11
Abstract
Abstract A polyphase induction motor is operated by an inverter drive system comprising a logic level controller. A number, preferably twelve or more, of independently driven phases causes harmonic fields, up to a number equal to the number of phases, to oscillate in synchrony with the fundamental oscillating field. A pulse-width modulation (“PWM”) carrier is used by the logic level controller to synthesize a desired drive alternating current, in which the pulsing distortion produced by the pulse width modulation produces a synchronous oscillating field in the driven polyphase induction motor.
Inventors
- 👤 Jonathan Sidney Edelson
- 👤 Brian Von Herzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:41
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; H02P27/06; H02P27/08; H02K; H02K3/00; H02K3/04; H02K3/28; H02K29/00; H02K29/03
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
100 words
An electrical induction machine comprising: a n phase order induction motor in which n is greater than three; a controller for synthesizing an alternating current having n phases, said alternating current inducing a first rotating magnetic field in windings of said motor, wherein said current is derived using pulse width modulation having a fixed number of pulses per cycle, said fixed number being less than n; wherein the timing and duration of said pulses is selected so that distortion in said current produces a second rotating magnetic field in said motor that is synchronous with said first rotating magnetic field.
Claim 2
Dependent Claim
100 words
An electrical induction machine comprising: a n phase order induction motor in which n is greater than three; a controller for synthesizing an alternating current having n phases, said alternating current inducing a first rotating magnetic field in windings of said motor, wherein said current is derived using pulse width modulation having a fixed number of pulses per cycle, said fixed number being less than n; wherein the timing and duration of said pulses is selected so that distortion in said current produces a second rotating magnetic field in said motor that is synchronous with said first rotating magnetic field.
Claim 3
Dependent Claim
34 words
An electrical induction machine as in claim 1 , wherein said pulse-width modulation technique comprises a fixed number of pulses per AC, cycle matched to a phase angle difference needed to drive individual phases.
Claim 4
Dependent Claim
24 words
An electrical induction machine as in claim 2 , wherein said number of pulses per AC cycle is less than said number of phases.
Claim 5
Dependent Claim
40 words
An electrical induction machine as in claim 2 , wherein said number of pulses per AC cycle is less than said number of phases and both said number of pulses and said number of phases are multiples of an integer.
Claim 6
Dependent Claim
16 words
An electrical induction machine as in claim 4 , wherein said integer is equal to three.
Claim 7
Dependent Claim
30 words
An electrical induction machine as in claim 5 , wherein said windings in said motor are connected in balanced groups each containing a number of phases equal to said integer.
Claim 8
Dependent Claim
48 words
An electrical induction machine as in claim 1 , wherein said pulse-width modulation technique comprises square wave pulses, wherein a voltage of said synthesized alternating current is controlled by adjusting a pulse duration and a frequency of said synthesized alternating current is controlled by adjusting a pulse period.
Claim 9
Dependent Claim
66 words
An electrical induction machine as in claim 1 , wherein a pulse-width modulation switching period is maintained constant by increasing a dead time between pulse periods, wherein a peak point of said synthesized waveform determines a maximum required difference between a positive and negative pulse duration, and wherein a total combined on time of both said positive and negative pulses is set to said maximum difference.
Claim 10
Dependent Claim
35 words
An electrical induction machine as in claim 1 , wherein said controller comprises a full bridge drive, and wherein small subsets of a total winding of said n phase order induction motor are independently connected.
Claim 11
Dependent Claim
101 words
A drive system comprising: electronics for synthesizing an alternating current having n phases to operate a n phase order induction machine in which n is greater than three, wherein said current is derived using pulse width modulation having a fixed number of pulses per cycle, said fixed number being less than n; wherein the timing and duration of said pulses is selected so that distortion in said current produces a rotating magnetic field in said motor that is synchronous with the primary rotating magnetic field developed in said motor; a logic level controller to provide pulse-width modulation signals to said electronics.
Claim 12
Dependent Claim
101 words
A drive system comprising: electronics for synthesizing an alternating current having n phases to operate a n phase order induction machine in which n is greater than three, wherein said current is derived using pulse width modulation having a fixed number of pulses per cycle, said fixed number being less than n; wherein the timing and duration of said pulses is selected so that distortion in said current produces a rotating magnetic field in said motor that is synchronous with the primary rotating magnetic field developed in said motor; a logic level controller to provide pulse-width modulation signals to said electronics.
Claim 13
Dependent Claim
33 words
A drive system as in claim 10 , wherein said pulse-width modulation technique comprises a fixed number of pulses per AC cycle matched to a phase angle difference needed to drive individual phases.
Claim 14
Dependent Claim
23 words
A drive system as in claim 11 , wherein said number of pulses per AC cycle is less than said number of phases.
Claim 15
Dependent Claim
39 words
A drive system as in claim 11 , wherein said number of pulses per AC cycle is less than said number of phases and both said number of pulses and said number of phases are multiples of an integer.
Claim 16
Dependent Claim
15 words
A drive system as in claim 13 , wherein said integer is equal to three.
Claim 17
Dependent Claim
29 words
A drive system as in claim 14 , wherein said windings in said motor are connected in balanced groups each containing a number of phases equal to said integer.
Claim 18
Dependent Claim
47 words
A drive system as in claim 10 , wherein said pulse-width modulation technique comprises square wave pulses, wherein a voltage of said synthesized alternating current is controlled by adjusting a pulse duration and a frequency of said synthesized alternating current is controlled by adjusting a pulse period.
Claim 19
Dependent Claim
65 words
A drive system as in claim 10 , wherein a pulse-width modulation switching period is maintained constant by increasing a dead time between pulse periods, wherein a peak point of said synthesized waveform determines a maximum required difference between a positive and negative pulse duration, and wherein a total combined on time of both said positive and negative pulses is set to said maximum difference.
Claim 20
Dependent Claim
32 words
A drive system as in claim 10 , further comprising a full bridge drive, and wherein small subsets of a total winding of a n phase order induction motor are independently connected.
Claim 21
Independent Claim
204 words
A method for producing a synchronized drive waveform for a n phase order induction machine in which n is greater than three, comprising the steps of: supplying electrical power from a DC power supply to n half-bridge circuits, wherein each of said half-bridge circuits comprises a positive switching element connected to a positive rail of said DC power supply and a negative switching element connect to a negative rail of said DC power supply; operating said switching elements according to an input control logic signal, wherein said control logic signal is a periodic waveform generated by a pulse-width modulation technique; outputting a drive waveform at each half-bridge to drive each phase, wherein said drive waveform is displaced in time by a phase angle that is equal to a physical angle of a winding in a stator; synthesizing an alternating current having n phases, wherein said current is derived using pulse width modulation having a fixed number of pulses per cycle, said fixed number being less than n; wherein the timing and duration of said pulses is selected so that distortion in said current produces a rotating magnetic field in said motor that is synchronous with the primary rotating magnetic field developed in said motor.
Claim 22
Independent Claim
204 words
A method for producing a synchronized drive waveform for a n phase order induction machine in which n is greater than three, comprising the steps of: supplying electrical power from a DC power supply to n half-bridge circuits, wherein each of said half-bridge circuits comprises a positive switching element connected to a positive rail of said DC power supply and a negative switching element connect to a negative rail of said DC power supply; operating said switching elements according to an input control logic signal, wherein said control logic signal is a periodic waveform generated by a pulse-width modulation technique; outputting a drive waveform at each half-bridge to drive each phase, wherein said drive waveform is displaced in time by a phase angle that is equal to a physical angle of a winding in a stator; synthesizing an alternating current having n phases, wherein said current is derived using pulse width modulation having a fixed number of pulses per cycle, said fixed number being less than n; wherein the timing and duration of said pulses is selected so that distortion in said current produces a rotating magnetic field in said motor that is synchronous with the primary rotating magnetic field developed in said motor.
Claim 23
Dependent Claim
31 words
The method of claim 19 , wherein said pulse-width modulation technique comprises a fixed number of pulses per AC cycle matched to a phase angle difference needed to drive individual phases.
Claim 24
Dependent Claim
21 words
The method of claim 20 , wherein said number of pulses per AC cycle is less than said number of phases.
Claim 25
Dependent Claim
37 words
The method of claim 20 , wherein said number of pulses per AC cycle is less than said number of phases and both said number of pulses and said number of phases are multiples of an integer.
Claim 26
Dependent Claim
13 words
The method of claim 22 , wherein said integer is equal to three.
Claim 27
Dependent Claim
27 words
The method of claim 23 , wherein said windings in said motor are connected in balanced groups each containing a number of phases equal to said integer.
Claim 28
Dependent Claim
45 words
The method of claim 19 , wherein said pulse-width modulation technique comprises square wave pulses, wherein a voltage of said synthesized alternating current is controlled by adjusting a pulse duration and a frequency of said synthesized alternating current is controlled by adjusting a pulse period.
Claim 29
Dependent Claim
63 words
The method of claim 19 , wherein a pulse-width modulation switching period is maintained constant by increasing a dead time between pulse periods, wherein a peak point of said synthesized waveform determines a maximum required difference between a positive and negative pulse duration, and wherein a total combined on time of both said positive and negative pulses is set to said maximum difference.
Claim 30
Dependent Claim
27 words
The method of claim 19 , wherein small subsets of a total winding of said n phase order induction machine are independently connected to full bridge drives.
References Cited (Backward Citations)
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