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	MICROPROCESSOR-CONTROLLED SERVO-MOTOR WITH ELECTRONIC COMMUTATION AND COMPARISON OF LOSSES AT DIFFERENT WAVEFORMS OF CURRENT	[View]   [Download]
Author(s)	Werner Demel; Philipp Klaus Sattler
Abstract	This paper deals with synchronous servo-motors with SmCo permanent magnets and compares the supplies having sinusoidal or rectangular waveform of the currents with respect to the losses, temperature and size of the motors. A sinusoidal and rectangular shape of the air gap flux density is considered additionally and the following motor operations are then under consideration: a) rectangular current and air gap flux density (rectangular operation) b) sinusoidal current and rectangular air gap flux density (mixed operation) c) sinusoidal current and air gap flux-density (sinusoidal operation) The paper illustrates that considerable losses arise in the permanent magnet by eddy currents which depend on current waveform. A special motor with a heat pipe in the shaft is presented which makes possible a better cooling of the magnets and enables a remarkable increase of rated power. Furthermore this type allows the use of the magnet material NdFeB which is very sensitive on heating.
Download	Filename: Unnamed file Filesize: 2.959 MB
Type	Members Only
Date	Last modified 2021-02-26 by System