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US 11,909,264 B2Granted
Rotor configuration for switched reluctance motor with minimized torque ripple
AssigneeBoard of Regents, The University of Texas System
InventorsBabak Fahimi, Seyed Ehsan Movahed Mohammadi, Mehdi Moallem
Life of this patent
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Abstract
A hybrid switched reluctance motor is provided that reduces torque ripple. A novel rotor design includes flux barriers. The flux barriers are positioned and shaped to create implicit saliency and reluctance torque for the motor. A gradual change in the motor reluctance results which avoids rapid increases in flux density. The rotor also increases efficiency by reducing acoustical and vibrational responses and associated energy loses.
Claims13
A switched reluctance motor comprising:
- a stator, having a plurality of stator poles;
- a rotor, having a plurality of rotor poles and a plurality of interpole segments located between the plurality of rotor poles;
- wherein each interpole segment of the plurality of interpole segments further comprises a concave void radially aligned with an arcuate flux barrier;
- wherein the arcuate flux barrier comprises an inner arcuate flux barrier and an outer arcuate flux barrier;
- wherein the inner arcuate flux barrier further comprises a first inner arcuate surface and a first outer arcuate surface, wherein the outer arcuate flux barrier further comprises a second inner arcuate surface and a second outer arcuate surface and wherein the concave void is bounded by an exterior arcuate surface;
- wherein the first inner arcuate surface, the first outer arcuate surface, the second inner arcuate surface, the second outer arcuate surface and the exterior arcuate surface are defined by an equation:
- r
-
- (
- θ
- )
- =
- (
- D
- shaft
- 2
- )
- ·
- C
- +
- C
- 2
- +
- 4
- ·
- sin
- 2
- (
- p
- ·
- θ
- )
- 2
- ·
- sin
-
- (
- p
- ·
- θ
- )
- p
- where:
- p is a machine pole pair number;
- Dshaft is a shaft diameter;
- r is a radius;
- θ is an angle in polar coordinates;
- and
- C is a constant value for a center line of the rotor;
- the exterior arcuate surface has a first set of parameter values:
- θ1=0.38-1.18 radians;
- and
- C1=9.1975;
- the second outer arcuate surface has a second set of parameter values:
- θ2=0.37-1.2 radians;
- and
- C2=8.6794;
- the second inner arcuate surface has a third set of parameter values:
- θ3=0.32-1.25 radians;
- and
- C3=6.5448;
- the first outer arcuate surface has a fourth set of parameter values:
- θ4=0.29-1.28 radians;
- and
- C4=5.9532;
- and
- the first inner arcuate surface has a fifth set of parameter values:
- θ5=0.28-1.3 radians;
- and
- C5=4.7081.
67 more elements
A switched reluctance motor comprising:
- a stator, having a plurality of stator poles;
- a rotor, having a plurality of rotor poles and a plurality of interpole segments located between the plurality of rotor poles;
- wherein each interpole segment, of the plurality of interpole segments, further comprises a concave void radially aligned with an arcuate flux barrier;
- wherein the arcuate flux barrier comprises an inner arcuate flux barrier and an outer arcuate flux barrier;
- wherein the inner arcuate flux barrier further comprises a first inner arcuate surface and a first outer arcuate surface, wherein the outer arcuate flux barrier further comprises a second inner arcuate surface and a second outer arcuate surface and wherein the concave void is bounded by an exterior arcuate surface;
- wherein the concave void is defined by a first width, the outer arcuate flux barrier is defined by a second width and the inner arcuate flux barrier is defined by a third width;
- and
- wherein the first width is greater than the second width;
- wherein the second width is greater than the third width.
6 more elements
A switched reluctance motor comprising:
- a stator, having a plurality of stator poles;
- a rotor, having a plurality of rotor poles and a plurality of interpole segments located between the plurality of rotor poles;
- wherein each interpole segment of the plurality of interpole segments further comprises a concave void radially aligned with an arcuate flux barrier;
- wherein the arcuate flux barrier comprises an inner arcuate flux barrier and an outer arcuate flux barrier;
- and
- wherein the inner arcuate flux barrier further comprises a first inner arcuate surface and a first outer arcuate surface, wherein the outer arcuate flux barrier further comprises a second inner arcuate surface and a second outer arcuate surface and wherein the concave void is bounded by an exterior arcuate surface;
- wherein the inner arcuate flux barrier further comprises a first curved end surface diametrically opposed to a second curved end surface.
4 more elements
Dependencies are inferred from the claim text.