| 摘要 |
An improved method of commutating an electronically commutated motor ( 20 ) is disclosed. The motor has a positive ( 34 ) and a negative connecting lead ( 36 ), a stator having at least one winding phase ( 22 ), a permanent-magnet rotor ( 26 ), a rotor-position sensor ( 28 ) for producing a rotor position signal (u 1 , u 2 ), and a full bridge circuit ( 78 ), comprising a pair of Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) coupled to each end of each winding phase ( 22 ). In order to prevent current shoot-through and prolong the service life of the MOSFETs, without employing a microprocessor, a respective-comparator ( 90, 90', 92, 92 ') is coupled to the gate of each MOSFET, in order to assure that the MOSFET is switched ON and OFF at an optimum time.
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