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Title: Torque ripple reduction in electric machines

Abstract

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:
; ; ;
Publication Date:
Research Org.:
GENERAL ELECTRIC COMPANY, Niskayuna, NY) (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1375935
Patent Number(s):
9,742,228
Application Number:
14/057,591
Assignee:
GENERAL ELECTRIC COMPANY DOEEE
DOE Contract Number:  
EE0005573
Resource Type:
Patent
Resource Relation:
Patent File Date: 2013 Oct 18
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Reddy, Patel Bhageerath, Huh, Kum-Kang, El-Refaie, Ayman Mohamed Fawzi, and Galioto, Steven Joseph. Torque ripple reduction in electric machines. United States: N. p., 2017. Web.
Reddy, Patel Bhageerath, Huh, Kum-Kang, El-Refaie, Ayman Mohamed Fawzi, & Galioto, Steven Joseph. Torque ripple reduction in electric machines. United States.
Reddy, Patel Bhageerath, Huh, Kum-Kang, El-Refaie, Ayman Mohamed Fawzi, and Galioto, Steven Joseph. Tue . "Torque ripple reduction in electric machines". United States. doi:. https://www.osti.gov/servlets/purl/1375935.
@article{osti_1375935,
title = {Torque ripple reduction in electric machines},
author = {Reddy, Patel Bhageerath and Huh, Kum-Kang and El-Refaie, Ayman Mohamed Fawzi and Galioto, Steven Joseph},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 22 00:00:00 EDT 2017},
month = {Tue Aug 22 00:00:00 EDT 2017}
}

Patent:

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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

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