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US 2015/0145202 A1Published application
Stepping motor control device and conveying device provided with the same
AssigneeSharp Kabushiki Kaisha
InventorTamaki MASHIBA
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Abstract
A stepping motor control device includes a driving IC driving a stepping motor by PWM control, and a setting circuit for setting PWM frequency of the driving IC. The setting circuit sets the driving IC such that in stepping motor accelerating and decelerating periods, the PWM frequency of the driving IC becomes higher than the PWM frequency of the driving IC in a constant-speed period of the stepping motor. Thus, power loss of the driving IC in the stepping motor accelerating and decelerating periods can be reduced, and ripple current can be reduced.
Claims5
A stepping motor control device, comprising:
- a driving unit driving said stepping motor by PWM control;
- and
- a control unit controlling said driving unit;
- wherein
- said control unit controls said driving unit such that
- in a period in which said stepping motor is kept rotating at a constant speed, said driving unit drives said stepping motor with a first PWM frequency, and
- in a period of accelerating or decelerating rotation of said stepping motor, said driving unit drives said stepping motor with a second PWM frequency,
- said second PWM frequency being higher than said first PWM frequency.
5 more elements
Dependencies are inferred from the claim text.