US6448736B1
Expired / Lapsed
US
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Method for controlling switched reluctance motor, and controller
Assignee: NXP USA Inc
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Filing: 2001-04-16
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Granted: 2002-09-10
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Expires: 2021-04-16
Abstract
Abstract A method to control a switched reluctance motor (SRM) with a first phase ( 1 ) and a second phase ( 2 ) comprises: aligning the rotor with the second phase ( 2 ); at a first time point (t 1 ), energizing the first phase ( 1 ) with a phase voltage that is substantially constant; monitoring an increase of the phase current (I 1 ) in the first phase ( 1 ) until the phase current reaches a maximum ( 302 ); monitoring a decrease ( 303 ) of the first current (I 1 ) until at a second time point (t 2 ) the phase current (I 1 ) reaches a minimum ( 304 ) and starts to increase again ( 305 ); de-energizing the first phase ( 1 ) at a third time point (t 3 ) that follows the second time point at (t 2 ) at a predetermined time interval; and repeating energizing, monitoring and de-energizing for the second phase ( 2 ) instead of the first phase ( 1 ).
Inventors
- 👤 Pavel Lajsner
- 👤 Radim Visinka
- 👤 Ivo Vecera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:47
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/08; H02P25/086; H02P25/089
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
151 words
A method to control a switched reluctance motor (SRM) having a rotor and a stator, wherein the stator has a plurality of coils, wherein electrically coupled coils form a plurality of phases with at least a first phase and a second phase, the method comprising the following steps: aligning the rotor with the second phase; at a first time point, energizing the first phase with a phase voltage that is substantially constant; monitoring an increase of a phase current in the first phase until the phase current reaches a maximum; monitoring a decrease of the phase current until at a second time point the phase current reaches a minimum and starts to increase again; de-energizing the first phase at a third time point that follows the second time point at a predetermined time interval; and repeating the energizing, monitoring and de-energizing steps for the second phase instead of the first phase.
Claim 2
Independent Claim
151 words
A method to control a switched reluctance motor (SRM) having a rotor and a stator, wherein the stator has a plurality of coils, wherein electrically coupled coils form a plurality of phases with at least a first phase and a second phase, the method comprising the following steps: aligning the rotor with the second phase; at a first time point, energizing the first phase with a phase voltage that is substantially constant; monitoring an increase of a phase current in the first phase until the phase current reaches a maximum; monitoring a decrease of the phase current until at a second time point the phase current reaches a minimum and starts to increase again; de-energizing the first phase at a third time point that follows the second time point at a predetermined time interval; and repeating the energizing, monitoring and de-energizing steps for the second phase instead of the first phase.
Claim 3
Dependent Claim
13 words
The method of claim 1 , wherein the predetermined time interval is zero.
Claim 4
Dependent Claim
17 words
The method of claim 1 , wherein the third time point coincides with the second time point.
Claim 5
Dependent Claim
17 words
The method of claim 1 , wherein said aligning step is performed by energizing the second phase.
Claim 6
Dependent Claim
114 words
A controller for a switched reluctance motor with rotor and first and second stator phases, the controller comprising: means to align the rotor with the second phase; means to energize the first phase at a first time point with a voltage that is substantially constant; means to monitor an increase of the phase current in the first phase until the phase current reaches a maximum and to monitor a decrease of the first current until at a second time point the phase current reaches a minimum and starts to increase again; and means to de-energize the first phase at a third time point that follows the second time point at a predetermined time interval.
Claim 7
Dependent Claim
114 words
A controller for a switched reluctance motor with rotor and first and second stator phases, the controller comprising: means to align the rotor with the second phase; means to energize the first phase at a first time point with a voltage that is substantially constant; means to monitor an increase of the phase current in the first phase until the phase current reaches a maximum and to monitor a decrease of the first current until at a second time point the phase current reaches a minimum and starts to increase again; and means to de-energize the first phase at a third time point that follows the second time point at a predetermined time interval.
References Cited (Backward Citations)
US4642543A
Cited
US5260635A
Cited
US4933620A
Cited
US5097190A
Cited
US5107195A
Cited
US5325026A
Cited
US5793179A
Cited
US5955861A
Cited
US5859518A
Cited
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