Variable reluctance resolver
AssigneeMinebea Co., Ltd.
InventorsMasahiro Kobayashi, Hiroyuki Kujirai, Takanobu Koyama, Nao Aoki
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Abstract
A variable reluctance resolver has a rotor which includes a noncircular core and which is rotatably supported inside a stator with a gap therebetween. The shape of the rotor is such that the gap permeance, which is based on the gap, varies according to a sine function of the rotational angle. Each of the salient poles of the rotor has an outer periphery comprising an arc of radius r centered on a point which is offset from the center of the rotor by a prescribed offset distance. The outer periphery of each salient pole does not extend to the inner periphery of the stator.
Claims5
A variable reluctance resolver wherein angular position is determined by detection of permeance between a rotor pole and a stator pole, the resolver comprising:
- a rotor and a stator wherein the rotor includes a noncircular core of magnetic material which is rotatably supported inside the stator with a magnetic gap therebetween,
- said noncircular core including a central circular portion having a circular inner periphery, and a plurality of salient poles protruding from the central circular portion,
- wherein each salient pole of the rotor has a center which is offset by a prescribed offset distance in the radial direction from the center of the rotor, and the outer peripheral shape of each salient pole comprises an arc of a circle of radius r which is centered on the center of the salient pole and which does not extend to the inner peripheral surface of the stator,
- wherein a shape of said rotor is such that a permeance of the magnetic gap varies according to a sine function for the rotational angle and said offset distance.
Dependencies are inferred from the claim text.