Low torque ripple switched reluctance motor
AssigneeDana Corporation
InventorsSergei F. Kolomeitsev, K. Fred Brodsky
Life of this patent
Estimating the term…
Abstract
A switched reluctance motor includes a stator defining a plurality of radially-inwardly-extending poles and a rotor defining a plurality of radially-outwardly-extending poles. The poles of the stator define a shape in radial cross-section characterized by a generally rectangular body portion, and a tip portion which tapers at an angle no greater than 40.degree. relative to the sides of the rectangular body portion. The nominal width of the rectangular body portion of each stator pole is at least 1.3 times the nominal (chordal) dimension across the arcuate, radially-innermost surface on the tip portion thereof.
Claims11
A switched reluctance motor comprising:
- an annular stator defining a plurality of radially-inwardly-extending poles, each stator pole defining a first shape in radial cross-section characterized by a generally rectangular body portion having substantially parallel sides, and a tapered tip portion with a radially-innermost arcuate surface, wherein the angle at which the sides of the tip portion taper is at least about 30.degree. but is no greater than about 40.degree. relative to the sides of the rectangular body portion, and wherein a nominal dimension from side to side of each pole's rectangular body portion is between about 1.3 times and about 1.45 times a nominal chordal dimension across the tip portion's radially-innermost arcuate surface;
- and
- a rotor, supported for rotation within said stator, defining a plurality of radially-outwardly-extending poles, each rotor pole defining a second shape in radial cross section.
A switched reluctance motor comprising:
- an annular stator defining a plurality of radially-inwardly-extending poles, each stator pole defining a first shape in radial cross-section characterized by a generally rectangular body portion having substantially parallel sides, and a tapered tip portion with a radially-innermost arcuate surface, wherein the angle at which the sides of the tip portion taper is at least about 30.degree. but is no greater than about 40.degree. relative to the sides of the rectangular body portion, and wherein a nominal dimension from side to side of each pole's rectangular body portion is between about 1.3 times and about 1.45 times a nominal chordal dimension across the tip portion's radially-innermost arcuate surface;
- a plurality of windings disposed about said stator poles wherein windings associated with diametrically opposing stator poles are electrically connected to define a respective motor phase;
- and
- a rotor, supported for rotation within said stator, defining a plurality of radially-outwardly-extending poles, each rotor pole defining a second shape in radial cross section.
A switched reluctance motor comprising:
- an annular stator defining a plurality of radially-inwardly-extending poles extending along a longitudinal axis, each stator pole defining a first shape in radial cross-section characterized by a generally rectangular body portion having substantially parallel sides, and a tapered tip portion extending the longitudinal length of said stator with a radially-innermost arcuate surface, wherein the angle at which the sides of the tip portion taper is at least about 30.degree. but is no greater than about 40.degree. relative to the sides of the rectangular body portion, and wherein a nominal dimension from side to side of each pole's rectangular body portion is between about 1.3 times and about 1.45 times a nominal chordal dimension across the tip portion's radially-innermost arcuate surface;
- a plurality of windings disposed about said stator poles wherein windings associated with diametrically opposing stator poles are electrically connected to define a respective motor phase;
- and,
- a rotor, supported for rotation within said stator, defining a plurality of radially-outwardly-extending poles, each rotor pole defining a second shape in radial cross section.
Dependencies are inferred from the claim text.