| 摘要 |
PROBLEM TO BE SOLVED: To attain size reduction and high efficiency for a motor and a drive with a simple circuit constitution by efficiently driving a three-phase brushless motor. SOLUTION: Sine wave PWM data which is similar to the counter electromotive force of a three-phase brushless motor 1 and corresponds to one rotation of the motor is written in a data disc 3, and the data disc 3 is attached to a rotating shaft 2 of the three-phase brushelss motor 1. A digital signal which changes into a sine wave wecompanying the rotation of the rotating shaft 2 of the data disc 3 is read by a plurality of data reading sensors 4 fixed to the stator of the motor, and the signal is sent to a PWM outputting part 6 via a signal processing circuit 5. Plurality of data read sensor 4 are disposed, so that the phases of the sine wave PWM signals generated respectively by each of them is deviated by 120 degrees to each other to obtain a PWM signal as the output from the PWM signal outputting part 6. |
