| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of reduction of a vibration reducing effect in high-speed rotation by a conventional microstep driver for a stepping motor, and to reduce unusual sounds generated when a stepping motor is rotated at high speed by a PWM-system microstep driver for the stepping motor. SOLUTION: The PWM-system microstep driver for a stepping motor is so formed as to have a rotational speed region where voltage is controlled by a PWM carrier frequency fpwm which is k (k is a natural number) times the fundamental frequency fc of the motor represented by the following equation (1), when the frequency of an external command pulse signal in all the rotational speed region is represented as fcom, the number of splitting of microsteps is as (a), the number of phases of the motor is as (m), and the number of magnetic pole pairs of the motor is as P. Besides, in a two-phase stepping motor, voltage signals to be applied to the first phase and the second phase are PWM- controlled by using PWM carriers whose phase difference is ninety degrees, respectively. |
