Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2008-03-28
2011-12-27
Ip, Paul (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S400040, C318S400110, C318S430000
Reexamination Certificate
active
08084975
ABSTRACT:
A brushless motor control system according to the present invention detects a rotor stop position when activating the brushless motor including a stator having coils of three phases U, V, and W, and controls a phase voltage for energizing the coils of the respective phases U, V, and W, and the brushless motor includes the stator having coils of phases U, V, and W of N (N≧2) poles, in which any one phase coil among the coils of the phases U, V, and W is removed in one of the N poles, and the brushless motor control system includes: a current rise detecting circuit that, when the brushless motor is in a stop state, sequentially selects coils of two phases from the coils of the respective phases U, V, and W, applies a predetermined direct current voltage between the selected coils of the two phases, and detects a value of an electric current flowing to the selected coils of the two phases; and a rotor stop position detecting unit that determines a rotor stop position of the brushless motor based on information of the value of the electric current flowing to the respective phase coils which is detected by the current rise detecting circuit.
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Shun-ichi Kondo, “Brushless Dc Motor Control Circuit Design”, Transistor Technology, CQ Publishing Co. Ltd.,pp. 212-220, Feb. 2000.
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Ip Paul
Nixon & Vanderhye P.C.
Shindengen Electric Manufacturing Co. Ltd.
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