Electric machine having reduced torque oscillations and axial thrust
First Claim
Patent Images
1. A component comprising:
- a longitudinal axle, having a plurality of keybars extending outward from a surface of the longitudinal axle, wherein each of the plurality of keybars are disposed axially along and circumferentially around the longitudinal axle, wherein an axis of the plurality of keybars is parallel to the longitudinal axle, and wherein a profile of all midpoints of the plurality of keybars is helicoidal around the longitudinal axle, and wherein each of the plurality of keybars are configured to receive a corresponding key on a corresponding rotor section of a plurality of rotor sections to define a stacked rotor assembly having a step-skewed configuration, except for two or more rotor sections in a center of the stacked rotor assembly, thereby resulting in a “
V”
configuration of skewing.
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Abstract
A component that includes a longitudinal axle, having a multiple keybars that extend outward from a surface of the axle, such that each of the keybars are disposed axially along and circumferentially around the axle. Also the axis of the keybars is parallel to the axle, such that a profile of all midpoints of the keybars is helicoidal around the axle, also the helicoidal profile is such that they make up one or more helicoidal paths. The profile may be herringbone skewed. The component may be part of a rotor assembly that is part of an electric machine such as an interior permanent magnet (IPM) or Synchronous Reluctance motor.
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Citations
29 Claims
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1. A component comprising:
a longitudinal axle, having a plurality of keybars extending outward from a surface of the longitudinal axle, wherein each of the plurality of keybars are disposed axially along and circumferentially around the longitudinal axle, wherein an axis of the plurality of keybars is parallel to the longitudinal axle, and wherein a profile of all midpoints of the plurality of keybars is helicoidal around the longitudinal axle, and wherein each of the plurality of keybars are configured to receive a corresponding key on a corresponding rotor section of a plurality of rotor sections to define a stacked rotor assembly having a step-skewed configuration, except for two or more rotor sections in a center of the stacked rotor assembly, thereby resulting in a “
V”
configuration of skewing.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An assembly comprising:
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a plurality of motor rotor sections; and a rotor bar extending through the plurality of motor rotor sections, wherein the rotor bar and the plurality of motor rotor sections are configured to step-skew the plurality of motor rotor sections from each other, except for two or more rotor sections in a center of the stacked rotor assembly, thereby resulting in a “
V”
configuration of skewing. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An Interior Permanent Magnet (IPM) machine rotor comprising:
a plurality of motor rotor sections, wherein the plurality of motor rotor sections are step-skewed, except for two or more rotor sections in a center of the stacked rotor assembly, thereby resulting in a “
V”
configuration of skewing.- View Dependent Claims (25, 26)
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27. A Synchronous Reluctance motor rotor comprising:
a plurality of motor rotor sections, wherein the plurality of motor rotor sections are step-skewed, except for two or more rotor sections in a center of the stacked rotor assembly, thereby resulting in a “
V”
configuration of skewing.- View Dependent Claims (28, 29)
Specification