Patent US4734633A successfully refreshed from Google Patents.
US4734633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control apparatus for a synchronous motor
Assignee: Toei Electric Co Ltd
•
Filing: 1985-06-05
•
Granted: 1988-03-29
•
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 21:24
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.
References Cited (Backward Citations)
GB1046983A
Cited
DE2734430A1
Cited
US4125796A
Cited
US4358722A
Cited
US4357569A
Cited
US4262241A
Cited
US4276504A
Cited
US4246528A
Cited
FR2451657A1
Cited
US4384242A
Cited
EP0085541A1
Cited
US4547719A
Cited
EP0089673A1
Cited
US4489266A
Cited
US4629958A
Cited
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 |