Low noise back EMF sensing brushless DC motor

Details Low noise back EMF sensing brushless DC motor Low noise back EMF sensing brushless DC motor

2006-11-28

2006-11-28

Duda, Rina (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S132000, C318S254100, C318S500000, C318S459000, C388S907500, C388S928100

Reexamination Certificate

active

07141949

ABSTRACT:
A low noise electronic three phase bridge controlled brushless DC motor suitable for whiteware appliance pumps and other appliance applications. Back EMF zero crossing sensing is used to determine rotor position and thus stator winding commutation times. Motor torque and speed are controlled by pulse width modulating the operation of that bridge switching device which has just been switched from an OFF state to an ON state on each new commutation. All three stator windings have current flowing in each winding commutation to improve motor current waveform and thereby reduce motor noise, but the current in one winding is always terminated before the end of the commutation period to allow the back EMF in that winding to be sensed to zero crossing.

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