PURPOSE: To make the rotation of a brushless motor smooth and to suppress the generation of vibration or noise by making the impression voltage of each armature winding variable in conformity with the fluctuation pattern of a load torque for each of a plurality of sections obtained by dividing one period of a rotor of the brushless motor, on the occasion of controlling the rotation of the rotor.
CONSTITUTION: One period (one revolution) of the rotor 1a of a brushless motor is divided into a plurality of sections on the basis of detection signals Ub, Vb and Wb of positions of the rotor 1a outputted by a position detecting part 3, and the PWM ON time of a control signal for driving an inverter part 2 is corrected in conformity with a load torque for each section. In other words, the impression voltage of the armature winding of the brushless motor 1 is made large for the section wherein the load torque is large, while the impression voltage of the armature winding of the brushless motor 1 is made small for the section wherein the load torque is small. Thereby the rotation of the brushless motor 1 can be made smooth and the generation of vibration or noise can be suppressed.
FUKADA AKIYOSHI
YAMAMOTO HIROYUKI
OHARA YOSHIYUKI
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