| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sufficient torque at the time of a high speed operation and quick acceleration and to suppress vibration in a low speed operation. SOLUTION: A feeding transistor 4 as a switching element makes adjustable the driving current of the coil of each phase. A computing circuit 21 detects speed based on a pulse command signal and controls the switching operation of the feeding transistor 4 in accordance with the speed. It also controls the switching operation of the feeding transistor 4 so that the driving current of the coil of each phase can be increased as the speed is increased. |
