| 摘要 |
<p>PURPOSE:To prevent trouble due to instantaneous stoppage of motor by feeding power to a motor continuously for a predetermined time even when the temperature detected through a temperature detecting element exceeds over a predetermined level. CONSTITUTION:When the temperature detected through a thermister TH exceeds over a predetermined level due to heating of a rear drive FET 26 or a drive FET 27, first timer in a control circuit 15 is actuated and a second timer is reset. Consequently, power supply to a motor 5 is reduced in order to lower the temperature of the FETs 26, 27. If the temperature detected through the thermister TH is higher than the predetermined level when the first timer expires, power supply to the motor 5 is stopped thus stopping the motor. If the detected temperature is lower than the predetermined level, the first timer is reset and the second timer is actuated. Reduced power supply to the motor 5 is maintained within the time limit of the second timer, and the motor is reset to normal power supply upon expiration of the second timer.</p> |
