초록 ▼

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 sta

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.

대표청구항 ▼

[ What is claimed is:] [1.] A synchronous electrical machine comprising:(a) a stator including:(i) a first plurality of stator teeth disposed in a circle around a rotational axis, each of said stator teeth of said first plurality being at a respective azimuthal position on said stator, said first pl

[ What is claimed is:] [1.] A synchronous electrical machine comprising:(a) a stator including:(i) a first plurality of stator teeth disposed in a circle around a rotational axis, each of said stator teeth of said first plurality being at a respective azimuthal position on said stator, said first plurality of stator teeth including an integral number m, greater than 1, of first sets of said stator teeth of said first plurality, each of said first sets including a same number, greater than 1, of said stator teeth of said first plurality, said stator teeth of each of said first sets being separated azimuthally by a certain tooth pitch, said first sets being separated azimuthally by a set pitch different from said tooth pitch, and(ii) a second plurality of stator teeth including an integral number m', greater than 1, of second sets of said stator teeth of said second plurality, each of said second sets including a same number, greater than 1, of said stator teeth of said second plurality, said stator teeth of each of said second sets being separated azimuthally by a tooth pitch different from said tooth pitch of said first sets, said second sets being separated azimuthally by a set pitch different from said tooth pitch of said second sets; and(b) at least one rotor, coaxial with said stator on said rotational axis, said at least one rotor including a first plurality of rotor teeth disposed in a circle around said rotational axis, said rotor operative to rotate about said rotational axis among a plurality of rotational positions relative to said stator, so that in each of said plurality of rotational positions, an electrical phase difference between each of said stator teeth of said first plurality and an azimuthally nearest of said rotor teeth of said first plurality is a stepwise function of said azimuthal position of said each stator tooth of said first plurality.