Low torque ripple surface mounted magnet synchronous motors for electric power assisted steering
First Claim
1. A motor, comprising:
- a stator having a plurality of stator poles wherein each of the plurality of poles is separated by a stator pole pitch;
a rotor wherein the rotor is concentrically disposed within the stator; and
a magnet mounted to the rotor, the magnet being pole shaped and having a skewed sides.
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Accused Products
Abstract
A motor having a stator and a rotor and wherein the stator has a plurality of stator poles is disclosed. Each of the plurality of stator poles is separated by a stator pole pitch. The rotor is concentrically disposed within the stator and at least one pair of magnets is mounted to the rotor. The at least one pair of magnets has at least one skewed side. Further, the rotor has a uniform variable air gap between an adjacent magnet. The magnet has inner and outer arcuate surfaces. The center of a circle describing the outside diameter of the magnet is off-centered from a circle describing an inside diameter of the magnet. Further, the at least one pair of magnets is skewed by at least one half of stator slot pitch.
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Citations
12 Claims
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1. A motor, comprising:
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a stator having a plurality of stator poles wherein each of the plurality of poles is separated by a stator pole pitch;
a rotor wherein the rotor is concentrically disposed within the stator; and
a magnet mounted to the rotor, the magnet being pole shaped and having a skewed sides. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for shaping a magnetic field emanating from a permanent magnet, wherein the permanent magnet is fixed to a rotor, the rotor being concentrically positioned within a stator of an electric machine and wherein an air gap exists between the permanent magnet and the stator, the method comprising:
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forming an arcuate outer surface in the permanent magnet that generates the magnetic field;
forming an arcuate inner surface in the permanent magnet; and
varying a thickness of the magnet between the outer and inner surfaces of the magnet. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification