| 摘要 |
A device for speed control of an electronically commutated permanent magnet synchronous motor uses Hall sensors to measure the rotor angle. A control unit evaluates the sensor signals and generates output signals for triggering semiconductors that control the winding currents. The control unit (7) determines the flanks of the three Hall sensor signals, and decides from them in which angle sector the rotor is and from the rotor speed determines an additional signal for the rotor position. From the additional signal and the sector signal, a pulse width-modulated (PWM) output signal is generated, the pulse width being continuously matched to the e.m.f waveform of the motor. The phase-shift between motor voltage and current is estimated. |
