Importance

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Abstract

A dynamoelectric machine having a large magnetic gap and flexible printed circuit phase windings includes a multi-pole samarium cobalt magnet assembly consisting of radially aligned magnets and circumferentially positioned interpole magnets attached to a soft iron ring for providing radially directed magnetic poles of alternating polarity, and a printed circuit winding assembly attached to a soft back iron sleeve for providing electromagnetic poles. The printed circuit winding assembly comprises a lamination of selectively aligned and interconnected printed circuit phase windings, each having serially connected printed circuit coils of the same phase. The winding and magnet assemblies are separated by a small mechanical gap to allow their relative rotation. The magnets and soft iron structures are proportioned to operate near the maximum energy product condition for Samarium Cobalt, where the sum of the mechanical gap thickness and the winding assembly thickness is the magnetic gap in a high reluctance circuit. A large volume of windings is placed within the permanent magnet field and entirely within the magnetic gap to provide a large ampere-turn condition at a low power dissipation. Brushless DC single and multi-phase torquers, brush-type DC torquers, stepper motors, and synchronous motors embodying the dynamoelectric machine of the present invention are highly efficient devices having a very low magnetic drag torque and a magnetic cogging torque substantially equal to zero.

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First Claim