US6771039B2
Expired / Lapsed
US
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Motor control apparatus and method
Assignee: Astemo Ltd
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Filing: 2002-12-27
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Granted: 2004-08-03
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Expires: 2022-12-27
Abstract
Abstract A motor control apparatus includes an inverter for applying voltage to a synchronous motor and a control apparatus 4 for calculating a voltage instruction value to be applied by a PWM signal. There are provided a current difference sensing unit of the synchronous motor, a current difference calculation unit for calculating a current change attributed to the voltage applied, and a position sensing unit for estimating a counter electromotive force direction according to the current change sensed by the current change sensing unit and the current change calculated by the current difference calculation unit. The magnetic pole position of the rotor of the synchronous motor is estimated according to the counter electromotive force direction estimated by the position sensing unit and the voltage applied to the synchronous motor is controlled according to the estimated magnetic pole position.
Inventors
- 👤 Yoshimi Sakurai
- 👤 Yoshitaka Iwaji
- 👤 Ryoso Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:05
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14; H02P6/16; H02P6/18; H02P21/00; H02P21/14; H02P21/18; H02P21/24
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
112 words
A motor control apparatus comprising a power converter for applying voltage to an AC motor and a control apparatus for controlling the voltage applied, said control apparatus including: current change sensing means for sensing a current change of the AC motor, current change calculation means for calculating a current change attributed to the voltage applied, and counter electromotive force estimation means for estimating a counter electromotive force direction according to the current change sensed by the current change sensing means and the current change calculated by the current change calculation means, wherein the voltage applied is controlled according to the counter electromotive force direction estimated by the counter electromotive force estimation means.
Claim 2
Dependent Claim
112 words
A motor control apparatus comprising a power converter for applying voltage to an AC motor and a control apparatus for controlling the voltage applied, said control apparatus including: current change sensing means for sensing a current change of the AC motor, current change calculation means for calculating a current change attributed to the voltage applied, and counter electromotive force estimation means for estimating a counter electromotive force direction according to the current change sensed by the current change sensing means and the current change calculated by the current change calculation means, wherein the voltage applied is controlled according to the counter electromotive force direction estimated by the counter electromotive force estimation means.
Claim 3
Dependent Claim
38 words
The motor control apparatus as claimed in claim 1 , wherein the control apparatus has correction means for correcting the current change calculated by the current change calculation means according to an input voltage of the power converter.
Claim 4
Dependent Claim
129 words
A motor control apparatus comprising a power converter for applying voltage to a protruding pole type synchronous motor and a control apparatus for controlling the voltage applied, said control apparatus including: current change sensing means for sensing a current change of the synchronous motor, current change calculation means for calculating a current change attributed to the voltage applied and a current change attributed to inductance changed by rotation of the synchronous motor, and counter electromotive force estimation means for estimating a counter electromotive force direction according to the current change sensed by the current change sensing means and the current change calculated by the current change calculation means, wherein the voltage applied is controlled according to the counter electromotive force direction estimated by the counter electromotive force estimation means.
Claim 5
Dependent Claim
129 words
A motor control apparatus comprising a power converter for applying voltage to a protruding pole type synchronous motor and a control apparatus for controlling the voltage applied, said control apparatus including: current change sensing means for sensing a current change of the synchronous motor, current change calculation means for calculating a current change attributed to the voltage applied and a current change attributed to inductance changed by rotation of the synchronous motor, and counter electromotive force estimation means for estimating a counter electromotive force direction according to the current change sensed by the current change sensing means and the current change calculated by the current change calculation means, wherein the voltage applied is controlled according to the counter electromotive force direction estimated by the counter electromotive force estimation means.
Claim 6
Dependent Claim
38 words
The motor control apparatus as claimed in claim 3 , wherein the control apparatus has correction means for correcting the current change calculated by the current change calculation means according to an input voltage of the power converter.
Claim 7
Dependent Claim
38 words
The motor control apparatus as claimed in claim 1 , wherein the current change sensing means senses a current change at a timing when the affect of current change changed by the power converter switching operation is removed.
Claim 8
Dependent Claim
38 words
The motor control apparatus as claimed in claim 1 , wherein the current change calculation means calculates a current change by receiving an application voltage instruction calculated before sensing the current change by the current change sensing means.
Claim 9
Dependent Claim
84 words
A motor control method for controlling an AC motor by controlling voltage applied to the AC motor from a power converter, wherein a current change of the AC motor is sensed, a current change attributed to the voltage applied is calculated, and a counter electromotive force direction is estimated according to the current change of the AC motor sensed and the current change attributed to the applied voltage calculated, so that the applied voltage is controlled according to the estimated counter electromotive force direction.
Claim 10
Dependent Claim
84 words
A motor control method for controlling an AC motor by controlling voltage applied to the AC motor from a power converter, wherein a current change of the AC motor is sensed, a current change attributed to the voltage applied is calculated, and a counter electromotive force direction is estimated according to the current change of the AC motor sensed and the current change attributed to the applied voltage calculated, so that the applied voltage is controlled according to the estimated counter electromotive force direction.
Claim 11
Dependent Claim
30 words
The motor control method as claimed in claim 7 , wherein the current change attributed to the applied voltage is corrected according to an input voltage of the power converter.
Claim 12
Dependent Claim
38 words
The motor control method as claimed in claim 7 , wherein a current change of the AC motor is sensed at a timing when the affect of current change changed by the power converter switching operation is removed.
Claim 13
Dependent Claim
35 words
The motor control method as claimed in claim 7 , wherein a current change attributed to the applied voltage is calculated by receiving an instruction calculated before sensing the current change of the AC motor.
Claim 14
Dependent Claim
107 words
A motor control method for controlling voltage applied to a protruding pole type synchronous motor from a power converter, thereby controlling the synchronous motor, the method comprising steps of: sensing a current change of the synchronous motor, calculating a current change attributed to the voltage applied, calculating a current change attributed to inductance changed by rotation of the synchronous motor, and estimating a counter electromotive force direction according to the sensed current change of the synchronous motor, the calculated current change attributed to applied voltage, and the calculated current change attributed to the inductance, thereby controlling the applied voltage according to the estimated counter electromotive force direction.
Claim 15
Dependent Claim
107 words
A motor control method for controlling voltage applied to a protruding pole type synchronous motor from a power converter, thereby controlling the synchronous motor, the method comprising steps of: sensing a current change of the synchronous motor, calculating a current change attributed to the voltage applied, calculating a current change attributed to inductance changed by rotation of the synchronous motor, and estimating a counter electromotive force direction according to the sensed current change of the synchronous motor, the calculated current change attributed to applied voltage, and the calculated current change attributed to the inductance, thereby controlling the applied voltage according to the estimated counter electromotive force direction.
Claim 16
Dependent Claim
30 words
The motor control method as claimed in claim 11 , wherein the current change attributed to the applied voltage is corrected according to an input voltage of the power converter.
Claim 17
Dependent Claim
38 words
The motor control method as claimed in claim 11 , wherein a current change of the synchronous motor is sensed at a timing when the affect of current change changed by the power converter switching operation is removed.
Claim 18
Dependent Claim
43 words
The motor control method as claimed in claim 11 , wherein a current change attributed to the applied voltage and a current change attributed to the inductance are calculated by receiving an instruction calculated before sensing the current change of the synchronous motor.
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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) | 2007-08-03 | 2008-02-02 | 2008-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-08-03 | 2012-02-02 | 2012-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-08-03 | 2016-02-02 | 2016-08-03 | $7700.00 | Window Closed / Lapsed |