US4734633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control apparatus for a synchronous motor
Assignee: Toei Electric Co Ltd
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Filing: 1985-06-05
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Granted: 1988-03-29
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Expires: 2005-06-05
Abstract
Abstract A speed control apparatus for a synchronous motor is provided with a resolver fixedly connected to a rotor of the motor, which produces a phase modulated signal corresponding to an angular position of revolving magnetic field in the motor, a circuit for converting the phase modulated signal into a rotational speed signal of the motor, a phase compensation circuit for advancing in phase a reference signal in accordance with the rotational speed signal, a multiplier for multiplying the phase modulated signal and a rotational speed instruction signal, a synchronous rectifier for synchronously rectifying the output of the multiplier by an output of the phase compensation circuit, and a current control loop circuit for receiving an output of the synchronous rectifier and for producing a signal having a phase angle delayed as much as the phase angle is advanced in the phase compensation circuit.
Inventors
- 👤 Tadahiro Ono
- 👤 Naoshi Miura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:42
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/16; H02P25/00; H02P25/02; H02P25/022; H02P25/024
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
A speed control apparatus for a synchronous motor comprising: means for designating a rotational speed of the motor; means for producing an angular position signal with respect to an angular position of a revolving magnetic field corresponding to that of a rotor on the motor; means for producing an armature current command signal in accordance with a speed instruction supplied from said speed designating means and said angular position signal supplied from said angular position signal producing means; rotational speed signal producing means responsive to said angular position signal for producing a speed signal corresponding to the speed of said motor; phase compensation means responsive to said speed signal for advancing a phase of said armature current command signal with respect to the angular position of said rotor of the motor; and means for producing a desired armature current on armature windings of the motor including a current control loop circuit responsive to said phase-advanced armature current command signal for outputting said desired armature current.
Claim 2
Dependent Claim
165 words
A speed control apparatus for a synchronous motor comprising: means for designating a rotational speed of the motor; means for producing an angular position signal with respect to an angular position of a revolving magnetic field corresponding to that of a rotor on the motor; means for producing an armature current command signal in accordance with a speed instruction supplied from said speed designating means and said angular position signal supplied from said angular position signal producing means; rotational speed signal producing means responsive to said angular position signal for producing a speed signal corresponding to the speed of said motor; phase compensation means responsive to said speed signal for advancing a phase of said armature current command signal with respect to the angular position of said rotor of the motor; and means for producing a desired armature current on armature windings of the motor including a current control loop circuit responsive to said phase-advanced armature current command signal for outputting said desired armature current.
Claim 3
Dependent Claim
42 words
A speed control apparatus for a synchronous motor as in claim 1, wherein said angular position signal producing means comprises a resolver fixedly connected to the rotor of said motor, said resolver producing a phase modulated signal as the angular position signal.
Claim 4
Dependent Claim
23 words
A speed control apparatus for a synchronous motor as in claim 1, wherein said rotational speed signal producing means comprises a tachometer generator.
Claim 5
Dependent Claim
37 words
A speed control apparatus for a synchronous motor as in claim 2, wherein said rotational speed signal producing means comprises a circuit means which converts the phase modulated signal supplied from the resolver into the speed signal.
Claim 6
Dependent Claim
45 words
A speed control apparatus for a synchronous motor as in claim 4, wherein said circuit means comprises a wave shaper for forming a rectangular wave from the phase modulated signal, a synchronous rectifier, a low pass filter, a differentiator in time and a switching circuit.
Claim 7
Dependent Claim
106 words
A speed control apparatus for a synchronous motor as in claim 4, wherein said armature current command signal producing means comprises a multiplier for multiplying the phase modulated signal supplied from the resolver and the signal supplied from the speed designating means, a synchronous rectifier for synchronously rectifying a signal supplied from the multiplier with a rectification reference signal supplied from the phase compensation device, and a reference signal generator for generating a reference signal applied to said phase compensation device, said rectification reference signal advancing in phase by a phase angle corresponding to the difference in phase between said speed signal and said reference signal.
Claim 8
Dependent Claim
129 words
A speed control apparatus for a synchronous motor as in claim 4, wherein said armature current command signal producing means comprises a synchronous rectifier for synchronously rectifying a phase modulated signal supplied from the resolver with a rectification reference signal supplied from the phase compensation device, a reference signal generator for generating a reference signal applied to said phase compensation device, and a multiplier for multiplying a signal supplied from said rectifier with a speed instruction signal of said speed designating means, said synchronous rectifier further comprising a digital type of rectifier, and said rectification reference signal advancing said armature current command signal in phase by a phase angle corresponding to the difference in phase between said speed signal and said reference signal supplied from said reference signal generator.
Claim 9
Dependent Claim
23 words
A speed control apparatus for a synchronous motor as in claim 6, wherein said synchronous rectifier is an analogue type of synchronous rectifier.
Claim 10
Dependent Claim
26 words
A speed control apparatus for a synchronous motor as in claim 6, wherein said reference signal generator comprises a sinusoidal wave generator and a wave shaper.
Claim 11
Dependent Claim
49 words
A speed control apparatus for a synchronous motor as in claim 6 or 9, wherein said phase compensation device comprises an integrator for integrating in time said reference signal, a logical comparator for comparing the speed signal with an output signal of the integrator, and a logical operation circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |