| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC pump with improved pumping efficiency and sharply reduced vibration and noises. SOLUTION: Where a time when a vane 13 of a pump passes a starting point 10 of a fluid guide device such as a volute forming the pump is t1, and a time of a communication timing for switching a direction or a flowing phase of current flowing in winding of plural phases of a motor is t2, a value t2-t1 is set zero or larger. Where a time of a commutation timing for commutating current flowing in the winding after the vane 13 of the pump passes the starting point 10 of the fluid guide device and for commutating the next current is t2', the pump is driven such that a value (t2'-t2)/4 is equal to or larger than the valve t2-t1. |
