US6344725B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling a synchronous motor
Assignee: Mitsubishi Electric Corp
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Filing: 2001-03-28
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Granted: 2002-02-05
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Expires: 2021-03-28
Abstract
Abstract In the synchronous motor controlling apparatus and method of the invention, a current is detected and subjected to coordinate transformation onto gamma-delta axis assumed for the rotor. A correction term is obtained on the basis of the derived current and an arbitrarily given correction current instruction. A gamma-delta axis voltage instruction is computed by adding a value obtained by multiplying the correction term by a proper gain to a voltage equation in a steady state of the synchronous motor. Consequently, a control method of small computational load, which does not require gain adjustment according to the inertia of a motor load, can be attained.
Inventors
- 👤 Toshiyuki Kaitani
- 👤 Yoshihiko Kinpara
- 👤 Naoki Nishiguchi
- 👤 Katsushi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:38
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/06; H02P6/20; H02P21/00; H02P21/34; H02P6/08; H02P6/14; H02P6/16; H02P6/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A synchronous motor controlling apparatus for driving a synchronous motor having a structure in which a permanent magnet is disposed in a rotor, the apparatus comprising: a current detecting unit which detects a current passing to said synchronous motor; a current coordinate transforming unit which coordinate transforms the current detected by said current detecting unit onto a γ-δ axis assumed on said rotor; a correction term computing unit which calculates a correction term on the basis of a provided correction current instruction and the current coordinate transformed by said current coordinate transforming unit; and a voltage instruction computing unit which calculates a γ-δ axis voltage instruction on the basis of a voltage equation in a steady state of said synchronous motor and the correction term calculated by said correction term computing unit.
Claim 2
Dependent Claim
132 words
A synchronous motor controlling apparatus for driving a synchronous motor having a structure in which a permanent magnet is disposed in a rotor, the apparatus comprising: a current detecting unit which detects a current passing to said synchronous motor; a current coordinate transforming unit which coordinate transforms the current detected by said current detecting unit onto a γ-δ axis assumed on said rotor; a correction term computing unit which calculates a correction term on the basis of a provided correction current instruction and the current coordinate transformed by said current coordinate transforming unit; and a voltage instruction computing unit which calculates a γ-δ axis voltage instruction on the basis of a voltage equation in a steady state of said synchronous motor and the correction term calculated by said correction term computing unit.
Claim 3
Dependent Claim
100 words
A synchronous motor controlling method of controlling a synchronous motor having a structure in which a permanent magnet is disposed in a rotor, the method comprising the steps of: detecting a current passing to said synchronous motor; coordinate transforming the detected current onto a γ-δ axis assumed on said rotor; computing a correction term on the basis of the derived current and a provided correction current instruction; and computing a γ-δ axis voltage instruction by adding a value obtained by multiplying the correction term by a proper gain to a voltage equation in a steady state of said synchronous motor.
Claim 4
Dependent Claim
100 words
A synchronous motor controlling method of controlling a synchronous motor having a structure in which a permanent magnet is disposed in a rotor, the method comprising the steps of: detecting a current passing to said synchronous motor; coordinate transforming the detected current onto a γ-δ axis assumed on said rotor; computing a correction term on the basis of the derived current and a provided correction current instruction; and computing a γ-δ axis voltage instruction by adding a value obtained by multiplying the correction term by a proper gain to a voltage equation in a steady state of said synchronous motor.
Claim 5
Dependent Claim
49 words
The synchronous motor controlling method according to claim 2 , wherein the correction term, Icmp is calculated using the relation, I cmp= I x*− Iγ+K cmp· Iδ 2 , where, Ix* is the provided correction current instruction, Iγ and Iδ are coordinate transformed currents, and Kcmp is a constant.
Claim 6
Dependent Claim
47 words
The synchronous motor controlling method according to claim 3 , wherein the γ-δ axis voltage instruction is calculated without consideration of an interference term voltage of the γ-δ axis current when Iδ is positive, and calculated in consideration of the interference term voltage when Iδ is negative.
Claim 7
Dependent Claim
123 words
A synchronous motor controlling method of controlling a synchronous motor having a structure in which a permanent magnet is disposed in a rotor, the method comprising the steps of: detecting a current passing to said synchronous motor; coordinate transforming the detected current onto a γ-δ axis assumed for said rotor; computing a correction term on the basis of the derived current and a provided correction current instruction; and computing a γ-δ axis voltage instruction by adding a value obtained by multiplying the correction term by a proper gain to a voltage equation in a steady state of said synchronous motor wherein a direct current is passed to a detected magnetic pole position, and a primary side resistance of the synchronous motor is estimated.
Claim 8
Dependent Claim
123 words
A synchronous motor controlling method of controlling a synchronous motor having a structure in which a permanent magnet is disposed in a rotor, the method comprising the steps of: detecting a current passing to said synchronous motor; coordinate transforming the detected current onto a γ-δ axis assumed for said rotor; computing a correction term on the basis of the derived current and a provided correction current instruction; and computing a γ-δ axis voltage instruction by adding a value obtained by multiplying the correction term by a proper gain to a voltage equation in a steady state of said synchronous motor wherein a direct current is passed to a detected magnetic pole position, and a primary side resistance of the synchronous motor is estimated.
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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) | 2005-02-04 | 2005-08-06 | 2006-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-02-04 | 2009-08-06 | 2010-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-02-04 | 2013-08-06 | 2014-02-05 | $7700.00 | Window Closed / Lapsed |