| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive unit for a brushless motor that makes a motor start with a simple method, and in a short time so as to obtain large torque at the time of starting.SOLUTION: When starting a brushless motor, if a stop position of a rotor is detected from time t1 to time t2, a drive unit inputs a start excitation pattern, according to the stop position of the rotor only for initial energizing time Ts1. After that, when energization is stopped, a plurality of signals SL1, SL2, SL3, SL4 are sequentially generated in an excitation switching timing signal, according to a rotational position of the rotor during free running. The drive unit detects a rotor position by using the second and subsequent signals SL2 to SL4, from among these signals SL1 to SL4, and is transferred to normal energization switching control. |
