| 摘要 |
An apparatus and method for minimizing electromagnetic interference in a unipolar phase motor having a supply current is provided. The motor further has a plurality of motor phases energizable with pulse width modulation (PWM). The method includes calculating the current harmonics on a right edge aligned PWM, calculating the current harmonics on a left edge aligned PWM pulse, determining the supply current by summing the current harmonics for the right edge aligned PWM pulse and the current harmonics for the left edge aligned PWM pulse, energizing a first motor phase with PWM, and staggering the PWM pulses for each successive motor phase by varying the energizing of any two adjacent energized phases based on the amount of supply current in the motor, the staggering of the PWM pulses minimizing electromagnetic interference and current harmonic generation due to an increase in the supply current.
|
