US4629958A
Expired / Lapsed
US
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Synchronous motor control system
Assignee: Fanuc Corp
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Filing: 1983-12-16
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Granted: 1986-12-16
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Expires: 2003-12-16
Abstract
Abstract A synchronous motor control system includes a sensor (112) for sensing the rotational angle of a synchronous motor (101), and a control circuit (108) for generating a sinusoidal value corresponding to the rotational angle sensed by the sensor (112) and for multiplying the sinusoidal value by an effective value current command. The multiplied output of the control circuit (108) is applied as a current command value to the armature winding of the synchronous motor (101). In this case, the arrangement is such that the control circuit (108) compensates the sensed rotational angle by the actual velocity of the synchronous motor (101) or by a rotational command velocity for the synchronous motor.
Inventors
- 👤 Mitsuo Kurakake
- 👤 Keiji Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:20
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/024
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
197 words
A synchronous motor control system for controlling a synchronous motor, comprising: a sensor for sensing a rotational angle of the synchronous motor and for generating a position signal; sinusoidal value generating means, coupled to said sensor, for generating a sinusoidal value corresponding to the position signal; computing control means, coupled to said sinusoidal value generating means, for multiplying an effective value current command by the sinusoidal value generated by said sinusoidal value generating means to produce three-phase current commands, for obtaining actual phase currents for the synchronous motor, and for computing digital three-phase AC signals based on the actual phase currents and the three-phase current commands; and synchronous motor drive means, coupled to said computing control means, for applying the digital three-phase AC signals to an armature winding of the synchronous motor as a current command value, said computing control means determining the actual velocity of the synchronous motor based on the position signal, and compensating the sensed rotational angle of the synchronous motor by advancing the rotational angle in proportion to the actual velocity of the synchronous motor, so that the sinusoidal value generated by said sinusoidal value generating means corresponds to the advanced rotational angle.
Claim 2
Dependent Claim
197 words
A synchronous motor control system for controlling a synchronous motor, comprising: a sensor for sensing a rotational angle of the synchronous motor and for generating a position signal; sinusoidal value generating means, coupled to said sensor, for generating a sinusoidal value corresponding to the position signal; computing control means, coupled to said sinusoidal value generating means, for multiplying an effective value current command by the sinusoidal value generated by said sinusoidal value generating means to produce three-phase current commands, for obtaining actual phase currents for the synchronous motor, and for computing digital three-phase AC signals based on the actual phase currents and the three-phase current commands; and synchronous motor drive means, coupled to said computing control means, for applying the digital three-phase AC signals to an armature winding of the synchronous motor as a current command value, said computing control means determining the actual velocity of the synchronous motor based on the position signal, and compensating the sensed rotational angle of the synchronous motor by advancing the rotational angle in proportion to the actual velocity of the synchronous motor, so that the sinusoidal value generated by said sinusoidal value generating means corresponds to the advanced rotational angle.
Claim 3
Dependent Claim
25 words
A synchronous motor control system according to claim 1, wherein said sinusoidal value generating means and said computing control means are formed by a microcomputer.
Claim 4
Dependent Claim
180 words
A synchronous motor control system for controlling a synchronous motor, connected to receive a rotational command velocity, comprising: a sensor for sensing a rotational angle of the synchronous motor and for generating a position signal; sinusoidal value generating means, coupled to said sensor, for generating a sinusoidal value corresponding to the position signal; computing control means, coupled to said sinusoidal value generating means, for multiplying an effective value current command by the sinusoidal value generated by said sinusoidal value generating means to produce three-phase current commands, for obtaining actual phase currents for the synchronous motor, and for computing digital three-phase AC signals based on the actual phase currents and the three-phase current commands; and synchronous motor drive means, coupled to said computing control means, for applying the digital three-phase AC signals to an armature winding of the synchronous motor as a current command value, said computing control means compensating the sensed rotational angle by the rotational command velocity for said synchronous motor, so that the sinusoidal value generated by said sinusoidal value generating means corresponds to the compensated rotational angle.
Claim 5
Dependent Claim
180 words
A synchronous motor control system for controlling a synchronous motor, connected to receive a rotational command velocity, comprising: a sensor for sensing a rotational angle of the synchronous motor and for generating a position signal; sinusoidal value generating means, coupled to said sensor, for generating a sinusoidal value corresponding to the position signal; computing control means, coupled to said sinusoidal value generating means, for multiplying an effective value current command by the sinusoidal value generated by said sinusoidal value generating means to produce three-phase current commands, for obtaining actual phase currents for the synchronous motor, and for computing digital three-phase AC signals based on the actual phase currents and the three-phase current commands; and synchronous motor drive means, coupled to said computing control means, for applying the digital three-phase AC signals to an armature winding of the synchronous motor as a current command value, said computing control means compensating the sensed rotational angle by the rotational command velocity for said synchronous motor, so that the sinusoidal value generated by said sinusoidal value generating means corresponds to the compensated rotational angle.
Claim 6
Dependent Claim
27 words
A synchronous motor control system according to claim 3, characterized in that said sinusoidal value generating means and said computing control means are constituted by a microcomputer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |