Importance

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Abstract

A half-wave brushless, four-phase DC motor includes sets of four stator windings fed at 90.degree. phase increments by four switches. The 0.degree. and 180.degree. windings are wound about their magnetic stator poles in bifilar conductor pairs, and the 90.degree. and 270.degree. windings are similarly wound. The bifilar windings are connected to generate the same directions of magnetic fields as the prior-art windings. As a result of the bifilar windings, the magnetic fields of the windings tend to be identical, and all the inductances of each winding tend to be transformer-coupled to the other winding of the bifilar pair. During sequential turn-off of the switches in normal operation, the coupled inductance causes a voltage kick which is poled so it can be damped, and the energy returned to the source, by a diode coupled across the other switch of the bifilar pair. Thus, a half-wave brushless DC motor keeps its advantage of low parts count and simplicity, while gaining the advantages of a full-wave motor in efficiency and voltage spike reduction.

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