| 摘要 |
The control circuit has at least one Hall generator detecting the instantaneous motor rotor position. Each semiconductor control element has a preamplifier in the form of a differential amplifier with two outputs. These are mirror-like connected to the detector voltage outputs of the Hall generators. Each detector voltage output of one generator leads to one amplifier plus input, and to the other amplifier minus input. The motor torque is controllable by fixed, or variable, supply voltage for the Hall generators. Preferably the motor direction of rotation is changed by changing the polarity of the supply voltage. In this manner the motor speed may be controlled up to its stop. |
