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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:
; ; ;
Issue Date:
Research Org.:
GENERAL ELECTRIC COMPANY, Niskayuna, NY) (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1375935
Patent Number(s):
9742228
Application Number:
14/057,591
Assignee:
GENERAL ELECTRIC COMPANY
Patent Classifications (CPCs):
H - ELECTRICITY H02 - GENERATION H02K - DYNAMO-ELECTRIC MACHINES
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. 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 = {2017},
month = {8}
}

Works referenced in this record:

Rotor having multiple permanent-magnet pieces in a cavity
patent, March 2009


Electric machine
patent, March 2011


Cooling system for rotating machine
patent, August 2011


Dovetail spoke internal permanent magnet machine
patent, August 2011


Interior permanent magnet synchronous motor
patent-application, April 2002


Permanent Magnet Embedment Rotating Electric Machine, Motor for Car Air Conditioner, and Enclosed Electric Compressor
patent-application, November 2007


Permanent-Magnet Reluctance Electrical Rotary Machine
patent-application, April 2008


Permanent Magnet Rotating Electric Machine and Electric Car Using the Same
patent-application, July 2009


Induction Motor with Improved Torque Density
patent, June 2010


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


Fractional Slot Multiphase Machines with Open Slots for Simplified Conductor Insertion in a Stator
patent-application, January 2011


Rotating Electrical Machine
patent-application, June 2011


Torque Ripple Reduction in Interior Permanent Magnet Synchronous Machines Using Stators With Odd Number of Slots Per Pole Pair
journal, March 2010