| 摘要 |
PURPOSE:To suppress fluctuation of torque and rotation of an electronic commutation motor through a rotation controller. CONSTITUTION:The rotation controller comprises a detector 105 for detecting the rotary angle of a motor 102, first, second and third cosine wave generating circuits 111, 112, 113 generating repetitive waveforms having periods Ts/n (n=1-M, Ts is conduction switching period of motor coil) add peak values Ai (i is an integer in the range of 1<=i<=M), a DC component generating circuit 110 outputting a predetermined data, and an adder means 106 for adding the repetitive waveforms and the predetermined data to create a torque variation correcting data. Corrected data is then fed, while being superposed on a motor control signal, to a motor drive circuit 109 through a gain control circuit 107 in order to correct torque according to the rotary position of the motor thus driving the motor 102 with a constant rotary torque. |
