| 摘要 |
PURPOSE:To accurately control to drive a motor without irregular rotary torque with a simple circuit configuration by controlling the amplitude of the waveform of a drive output for driving linearly in response to a drive torque. CONSTITUTION:A brushless motor has a magnet rotor, and the rotating phase angle of the rotor is detected by a Hall element HE. The output of the Hall element HE is inputted to a differential amplifier AMP, and the output is applied through the first and second waveform converters W1, W2 to the bases of transistors Q1, Q2. The output of other drive circuit is applied to transistors Q3, Q4. The converters W1, W2 convert the output waveform of the element HE by the half period of the waveform into a half waveform, and the energizing phases of stationary armature coils L1, L2 are controlled by the output. |
