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A dynamoelectric machine which may operate in a motor mode or a generator mode is described wherein substantially the entire magnetic circuit is provided by ferrite material. In one particular embodiment, hard ferrite permanent magnet segments are mounted on a rotor plate while soft ferrite magnet s

A dynamoelectric machine which may operate in a motor mode or a generator mode is described wherein substantially the entire magnetic circuit is provided by ferrite material. In one particular embodiment, hard ferrite permanent magnet segments are mounted on a rotor plate while soft ferrite magnet segments with electrical coil windings mounted thereon are provided in a stator spaced apart from the rotor by an air gap. Other embodiments of the concept are described. Provision is made for decreasing mechanical vibration and audible noise by decreasing the magnitude of pulsations of air gap flux.

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In a brushless D.C. dynamoelectric machine, which comprises: a disc-like rotor element comprising hard ferrite toroid means providing a plurality of magnetic poles of alternating polarity and mounted for rotation about its axis, a disc-like stator element comprising soft ferrite toroid means and mou

In a brushless D.C. dynamoelectric machine, which comprises: a disc-like rotor element comprising hard ferrite toroid means providing a plurality of magnetic poles of alternating polarity and mounted for rotation about its axis, a disc-like stator element comprising soft ferrite toroid means and mounted coaxially with and spaced apart from the rotor element to define an air gap therebetween, said soft ferrite toroid means being formed with radially-directed coil winding-receiving slots, and electrical coil windings mounted to said stator in said slots, the improvement which comprises means for decreasing the magnitude of pulsations of air gap flux during rotation of said rotor with respect to said stator.