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Title: Torque ripple reduction in electric machines

An electric machine, such as an Internal Permanent magnet or Synchronous Reluctance machine, having X phases, that includes a stator assembly, having M slots, with a stator core and stator teeth, that is further configured with stator windings to generate a stator magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface that defines a cavity; and a rotor assembly, having N poles, disposed within the cavity which is configured to rotate about the longitudinal axis, wherein the rotor assembly includes a shaft, a rotor core located circumferentially around the shaft. The machine is configured such that a value k=M/(X*N) wherein k is a non-integer greater than about 1.3. The electric machine may alternatively, or additionally, include a non-uniformed gap between the exterior surface of the rotor spokes and the interior stator surface of the stator.
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
1375935
Assignee:
GENERAL ELECTRIC COMPANY DOEEE
Patent Number(s):
9,742,228
Application Number:
14/057,591
Contract Number:
EE0005573
Resource Relation:
Patent File Date: 2013 Oct 18
Research Org:
GENERAL ELECTRIC COMPANY, Niskayuna, NY) (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Works referenced in this record:

Cooling system for rotating machine
patent, August 2011

Dovetail spoke internal permanent magnet machine
patent, August 2011

Dovetail Spoke Internal Permanent Magnet Machine
patent-application, November 2010

Torque Ripple Reduction in Interior Permanent Magnet Synchronous Machines Using Stators With Odd Number of Slots Per Pole Pair
journal, March 2010
  • Han, Seok-Hee; Jahns, Thomas M.; Soong, Wen L.
  • IEEE Transactions on Energy Conversion, Vol. 25, Issue 1, p. 118-127
  • DOI: 10.1109/TEC.2009.2033196