Effect of annealing process of iron powder on magnetic properties and losses of motor cores |
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Authors: | Fuzheng Yin Haibo Yang Jianjun Tian De-An Pan Jian Wang Shengen Zhang |
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Affiliation: | (1) College of Engineering, University of Florida, Rhines Hall 216, Gainesville, FL 32611, USA |
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Abstract: | Iron powder magnetic cores are used as soft magnetic rotors, in micro special motors such as BS brake motors, refrigerator
compressor motors and brushless servo motors. Heat treatment of iron powder played an important role in the magnetic properties
and loss of the motor cores. After the annealing process, the cracks and the pores on the surface of the powder decreased
which in turn decreased the micro-hardness. The Vickers-hardness of the powder decreased from 50–42, while the resistance
of the cores increased by 87% after annealing at 400°C for 30 min. The amplitude permeability and magnetic loss of the cores
reached the maximum and minimum values, respectively. The magnetic loss of the cores was separated into hysteresis loss and
eddy current loss by Stoppels Method which were decreased by the annealing process. |
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Keywords: | |
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