Cycloidal reluctance motor with rotor electromagnets

a cycloidal reluctance and rotor electromagnet technology, applied in the direction of synchronous motors, magnetic circuit rotating parts, magnetic circuit shape/form/construction, etc., can solve problems such as problematic character

Active Publication Date: 2020-10-01
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a new kind of electric machine that can generate more torque at lower speeds. This is achieved by incorporating the use of previously unused forces in the machine, which are called radial airgap forces. This technology improves the performance of the electric machine by allowing it to output higher levels of torque at lower speeds.

Problems solved by technology

Such a characteristic may be problematic in an eccentric reluctance machine, i.e., a cycloidal machine in which the rotor is eccentrically positioned radially within the stator.

Method used

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  • Cycloidal reluctance motor with rotor electromagnets
  • Cycloidal reluctance motor with rotor electromagnets
  • Cycloidal reluctance motor with rotor electromagnets

Examples

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Embodiment Construction

[0023]Referring to the drawings, wherein like reference numbers refer to the same or like components in the several Figures, an electrical system 15 is shown schematically in FIG. 1. The electrical system 15 may be used as part of a vehicle 10 having a vehicle body 11, e.g., a motor vehicle having a set of road wheels 12 in rolling contact with a road surface 14. The electrical system 15 may also be used in other types of vehicles 10, for instance aircraft, watercraft, and rail vehicles, or in other mobile, non-vehicular applications such as robots and mobile platforms. Stationary applications may likewise benefit from use of the electrical system 15 as set forth below, and therefore the vehicle 10 of FIG. 1 is just one possible beneficial application of the present teachings.

[0024]The electrical system 15 includes a rotary cycloidal electric machine (ME) 20 having an output member 25 coupled to a balanced rotor 30 (see FIG. 2). As used herein, the term “balanced” with respect to th...

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Abstract

A cycloidal reluctance machine includes a stator surrounding a rotor. Stator windings and rotor windings form respective concentric rotor and stator electromagnets. The rotor is eccentrically positioned with respect to the stator to move with two degrees of freedom (2DOF), including rotating motion about a rotary axis of the rotor and orbiting motion about a center axis of the stator. A rotor constraint mechanism (RCM) constrains motion of the rotor, such that the rotor is able to generate and transmit output torque to a coupled load in at least one of the 2DOF. A magnetic field polarity of stator poles and / or rotor poles of the respective stator and rotor changes over one electrical cycle of the polyphase voltage. The coupled load may be a drive axle of a vehicle in some embodiments. In others, the stator and rotor windings are driven via different power inverters.

Description

INTRODUCTION[0001]Rotary electric machines, when configured as motors or electric generators, typically include a rotating member (“rotor”) and a stationary member (“stator”). The rotor may be disposed radially within or radially outside of the stator, such that the stator respectively surrounds or is surrounded by the rotor. In a permanent magnet machine, a set of rare earth magnets is arranged on and / or embedded within laminations of the rotor to provide a rotor magnetic field. Equally-spaced radial slots around a perimeter of a stator core are wound with lengths of conductive wire or bar conductor segments. In an alternating current (AC) machine configuration, a polyphase input voltage is applied to phase leads of the stator windings to generate a rotating magnetic field with respect to the stator core.[0002]A resulting push-pull effect between the rotor and stator fields ultimately imparts a rotational force to the rotor. Torque imparted by such rotation may be harnessed, for in...

Claims

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Application Information

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IPC IPC(8): H02K1/24H02K3/28H02K19/12H02K3/52H02P27/06
CPCH02K1/24H02K19/12H02P27/06H02K3/28H02K3/52H02K2201/18H02K11/044H02K21/14H02K7/075H02K1/278H02K2213/03H02K41/06H02K7/12H02K19/10H02P25/08H02P6/005
InventorFATEMI, ALIREZALAHR, DEREK F.
OwnerGM GLOBAL TECH OPERATIONS LLC