Rotor angle detecting apparatus for dc brushless motors

Details Rotor angle detecting apparatus for dc brushless motors Rotor angle detecting apparatus for dc brushless motors

H - Electricity

02

K

H02K 24/00 (2006.01) H02K 29/06 (2006.01) H02P 6/18 (2006.01)

Patent

CA 2372266

A rotor angle detecting apparatus for a DC brushless motor is capable of detecting the angle of the rotor of the DC brushless motor with accuracy without the need for a position detecting sensor. A motor controller has a high-frequency voltage imposer, an angle detector, a U-phase current sensor, and a W-phase current sensor for detecting the rotor angle of the DC brushless motor. The angle detector detects the rotor angle .theta. using a current value IU_s detected by the U-phase current sensor, a current value IW_s detected by the W-phase current sensor, and high-frequency components depending on high-frequency voltages vu, vv, vw, when the high-frequency voltages vu, vv, vw are imposed on command values VU_c, VV_c, VW_c for three-phase voltages by the high-frequency voltage imposer.

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