Patent ID: 6249103
Filing Date: 2001-06-19
Classification: H02P

Abstract:
An electric motor driver system, the motor including a rotor arranged to rotate relative to a stator, the stator containing at least one winding, the driver system comprising:first, second and third winding terminals connectable to the winding, the first winding terminal connected to a first voltage suply terminal, the third winding terminal intermediate the first and second winding terminals;a first switch connected between the second winding terminal and a second voltage supply terminal, the first switch having a gate terminal connected to the third winding terminal;a second switch connected between the third winding terminal and the second voltage supply terminal, the second switch having a gate terminal; anda control circuit connected to the gate terminal of the second switch, the control unit operable to, upon application of voltage supply terminals, initially render the second switch conductive and consequently cut off the first switch for a predetermined time period, and cut off the second switch and render the first switch conductive after the predetermined time period, so that during the predetermined time period, only a portion of the winding is energized and after the predetermined time period, the whole winding is energized.