Reduction of cogging torque in permanent magnet motors
Touzhu Li
Slemon, G.
Toronto Univ., Ont.;
This paper appears in: Magnetics, IEEE Transactions on
Publication Date: Nov 1988
Volume: 24,
Issue: 6
On page(s): 2901-2903
Meeting Date: 07/12/1988 - 07/15/1988
Location: Vancouver, BC, USA
ISSN: 0018-9464
References Cited: 5
CODEN: IEMGAQ
INSPEC Accession Number: 3375975
Digital Object Identifier: 10.1109/20.92282
Current Version Published: 2002-08-06
Abstract
Cogging torque in a permanent magnet motor, which arises from the
interaction of the rotor magnets with the steel teeth on the stator, can
be reduced by skewing the stator teeth, but only at the expense of added
complexity in stator construction and some loss of output torque. It is
shown that by appropriate choice of the angular width of the magnet
relative to the tooth-plus-slot dimension, the cogging torque can be
reduced to about 1% of rated torque. A further reduction to about 0.3%
resulted from a rotational shift of one pair of poles with respect to
the other pair in a four-pole motor. The analysis of cogging torques
with both surface mounted and inset magnet rotors as well as
experimental confirmation are reported
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