| 摘要 |
PROBLEM TO BE SOLVED: To resolve the problem of a conventional sensorless motor such as that the period to break torque is not known and that it cannot stop the rotation of a motor quickly, since the rotational speed drops at the time of reversal brake and it cannot detect a counter-motive signal in reverse direction even if it rotates reversely at last. SOLUTION: This driving circuit is one related to a sensorless motor, which puts the motor in reverse torque brake condition by adding a brake command signal to a current application logic circuit 77, counts up a counter circuit 89 to generate a count signal, and stops the drive current to a drive coil with the count signal and the signal of the brake command, thereby breaking the drive torque. |
