NDLI: Small copper loss unidirectional current type BLDC motor and the motor system

Content Provider	IEEE Xplore Digital Library
Author	Yasuhiro, K. Zawawi, S.A.K. Keita, T. Ohyama, T. Araki, Y.
Copyright Year	2010
Description	Author affiliation: Ritsumeikan University (Yasuhiro, K.; Zawawi, S.A.K.; Keita, T.; Ohyama, T.; Araki, Y.)
Abstract	In an electric car, wide range speed driving is required. In order to increase the rotation speed of a bidirectional current type cylindrical BLDC motor, the applied voltage needs to be increased because of the increase of back-EMF. When that voltage gets to a maximum value, torque current, iq stop increasing. In order to increase iq, negative direct axis armature current, id, is generated. In other words, the weak field control is carried out. The motor's efficiency lowers because of the copper loss increase, if id flows in the control circuit. From the above facts, the motor, in which high speed rotation is possible and the efficiency is not changed in the high speed rotation, is desired. Furthermore, the induction brake current, iB flows in the armature winding during high speed rotation. The iB lowers the rotation speed and motor's efficiency The iB can be prevented by the control circuit of the motor system. Another method is to change the parallel circuit number of the armature winding. The back-EMF constant can be lowered by increasing the parallel circuit number. The armature current is increased by lowering the back-EMF constant.
Starting Page	883
Ending Page	888
File Size	200245
Page Count	6
File Format	PDF
ISBN	9781424477203
e-ISBN	9788986510119
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-10
Publisher Place	Korea (South)
Access Restriction	Subscribed
Rights Holder	KIEE
Subject Keyword	Permanent magnet motors Brushless motors Electromagnets Torque Induction motors Permanent magnets Magnetic flux
Content Type	Text
Resource Type	Article

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