| 摘要 |
The drive circuit ( 10 ) includes a processing and control circuit ( 14 ) comprising a protection circuit ( 16 ), designed to generate at its output inhibiting signal (C) starting from every zero crossing of the motor supply volts (V), the inhibiting signal (C) having a predetermined duration (t<SUB>0</SUB>) which is less than a quarter of the period of the supply voltage (V); and an enabling circuit ( 17 ), connected to a sensor of the position of the rotor ( 6 ) and designed to enable a first and a second controlled conduction device ( 12, 13 ) associated with the stator winding ( 4 ) to conduct current alternately, in synchronization with the signal (H) supplied by the position sensor ( 6 ). The enabling circuit ( 17 ) is connected to the protection circuit ( 16 ) in such a way that the conduction of current through the controlled conduction device ( 12, 13 ) enabled at any time is inhibited for the duration (t<SUB>0</SUB>) of the inhibiting signal (C).
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