Patent ID: 6888328
Filing Date: 2005-05-03
Classification: H02P

Abstract:
1. A method of operating a DC brushless motor having phases A through E, whereby phase A has a polarity of back EMF opposite of that of phase C; phase B has a polarity of back EMF opposite of that of phase D; phase C has a polarity of back EMF opposite of that of phase E, phase D has a polarity of back EMF opposite of that of phase A; and phase E has a polarity of back EMF opposite of that of phase B, the method including: providing a switching arrangement such that phase C is fed with current by a freewheeling phase A, phase D is fed with current by a freewheeling phase B, phase E is fed with current by a freewheeling phase C, phase A is fed with current by a freewheeling phase D, and phase B is fed with current by a freewheeling phase E, whereby positive torque is generated by the phase in which current is being freewheeled through.