| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a drive unit of a sensorless-drive motor, in which noise due to current fluctuation is reduced, and shortening of battery lifetime due to voltage fluctuation is suppressed. <P>SOLUTION: The drive unit 1 of the motor includes a battery 2, a power supply circuit 3, an inverter circuit 4, and a control circuit 5. A charging circuit 6 having a capacitor 61 is arranged between the power supply circuit 3 and the inverter circuit 4 in the drive unit 1. The charging circuit 6 charges the capacitor 61 from the battery 2, in driving in which the motor is controlled by a rotation position detected from the induced voltage, supplies current to the inverter circuit 4 from the capacitor 61 in forced commutation at the start of the motor. <P>COPYRIGHT: (C)2010,JPO&INPIT |
