| 摘要 |
PURPOSE:To make a proper phase switching possible always from low speed to high speed, by performing a normal control for the phase switching after output voltages of Hall effect elements are variably controlled according to the rotational speed of a motor. CONSTITUTION:The present apparatus controls a phase switching according to the outputs of Hall effect elements 203 to 205. The apparatus comprises detecting means for detecting the rotational speed of a motor, and control means for variably controlling the output voltages of the Hall effect elements 203 to 205 according to the output of the detecting means. Also, the control means controls an amplification factor until the phase switching of a stator coil 216 through receiving the outputs of the Hall effect elements 203 to 205 according to the rotational speed of the brushless DC motor. Thus, when the motor rotates at both low and high speeds, the analogue phase switching adapted for the rotation can be implemented. Further, a stable motor rotating control with a small jitter can be implemented. |
