Quasi bipolar topology for brushless motors

Details Quasi bipolar topology for brushless motors Quasi bipolar topology for brushless motors

2005-05-03

2005-05-03

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S132000, C318S434000

Reexamination Certificate

active

06888328

ABSTRACT:
A circuit100for a five phase DC brushless motor includes a first coil A and a first primary switch S1for controlling current through the first coil; a second coil B and a second primary switch S3for controlling current through the second coil; a third coil C and a third primary switch S5for controlling current through the third coil; a fourth coil D and a fourth primary switch S7for controlling current through the fourth coil; a fifth coil E and a fifth primary switch S9for controlling current through the fifth coil. The first coil A is arranged to have a polarity of back EMF opposite of that of the third coil C; the second coil B is arranged to have a polarity of back EMF opposite of that of the fourth coil D; the third coil C is arranged to have a polarity of back EMF opposite of that of the fifth coil E, the fourth coil D is arranged to have a polarity of back EMF opposite of that of the first coil A; and the fifth coil E is arranged to have a polarity of back EMF opposite of that of the second coil B. The circuit further includes a first freewheeling current conducting switch S2and a diode A between the first coil and the third coil; a second freewheeling current conducting switch S4and a diode between the second coil and the fourth coil; a third freewheeling current conducing switch S6and a diode between the third coil and the fifth coil; a fourth freewheeling current conducting switch S8and a diode between the fourth coil and the first coil, and a fifth freewheeling current conducting switch S10and diode between the fifth coil and the second coil.

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patent: 6124688 (2000-09-01), Coles et al.
patent: 6331757 (2001-12-01), Makaran

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