| 摘要 |
PURPOSE:To improve start probability by providing the first acceleration process for controlling the excitation pattern geared to the rotational position of a rotor based on counter electromotive voltage between first and second stepping processes, and supplying an exiting current with the inside step pattern where the second step process has skipped by one in backward or forward direction from the final excitation pattern of the first acceleration process. CONSTITUTION:A controller 2 performs the control of start of a motor and the stationary operation after start, based on the signal of a counter electromotive voltage detecting circuit 1. That is, in the first step process, a stator coil is excited, according to the specified pattern. Next, the first acceleration process is performed for controlling the excitation pattern, according to the rotational position of a rotor. And, the second step process is performed, adding 2 to the count value of a counter representing the final excitation pattern of the first acceleration process, whereby it gets in the condition that it has skipped by one, and reverse excitation drive to reverse the exciting current from negative to positive is executed. And, when the second step process is executed, it enters the second acceleration process, and then the fixed speed process is executed. |
