Electricity: motive power systems – Switched reluctance motor commutation control
Reexamination Certificate
2007-06-05
2007-06-05
Ip, Paul (Department: 2837)
Electricity: motive power systems
Switched reluctance motor commutation control
C318S434000, C318S560000, C360S075000
Reexamination Certificate
active
11180651
ABSTRACT:
A system and method for determining the rotational speed of a motor, such as a three-phase disk drive motor, detects back electromotive force voltage generated during operation of the motor with an automatic pole calibration to minimize or eliminating variations in the wave of a freeze signal. A phase voltage at a winding is compared against a center tap (CT) voltage. Once the phase voltage falls to a specified voltage level, a detect signal is generated. A predetermined time after the detect signal is generated, a freeze signal is generated for freezing at least the circuit associated with the winding.
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Chui Siew Yong
Hoo, legal representative Kuong
Leong Foo Leng
Toeh Cheng Yong
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