Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-09-08
2000-08-08
Enad, Elvin
Electrical generator or motor structure
Dynamoelectric
Rotary
310 49R, 310156, 310259, 310261, 310263, H02K 122
Patent
active
061006203
ABSTRACT:
A synchronous rotary electrical machine. According to the first aspect of the present invention, the electrical phase difference between the stator teeth and the nearest rotor teeth is a stepwise function of azimuthal stator tooth position. In a preferred embodiment of the present invention, the stator teeth grouped into two or more sets, and the machine is multiphase. Each set is associated with an armature winding wound in a plane perpendicular to the rotational axis of the machine. The rotor teeth are spaced at the same pitch as the stator teeth of a single set. When direct electrical current is provided to an excitation winding concentric with the rotational axis, an m-phase alternating EMF is induced in the armature windings. With two tandem groups of such sets of stator teeth, each with its own tooth pitch, alternating EMFs of different frequencies are generated. Two alternating EMFs of different frequencies are heterodyned to provide alternating EMF at the difference frequency. According to the second aspect of the present invention, the rotor and the stator are axially adjacent, and the facing rotor and stator teeth are at the same radial distance from the rotational axis. If the machine is single phase, there are equal numbers of facing rotor and stator teeth. If a rotor is between two sets of stator teeth, the two sets can have different numbers of teeth, allowing the generation of alternating EMFs of different frequencies, and the heterodyning thereof to provide alternating EMF at the difference frequency.
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Enad Elvin
Friedman Mark M.
S.H.R. Ltd. BVI
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