Performance of a fractional dc electric motor equipped with plastic bonded Nd{sub 2}Fe{sub 14}B stator poles
- Department of Physics--Chemistry and Technology of Materials, Technological Education Institute of Piraeus, P. Ralli Thivon 250, Aegaleo 122 44 (Greece)
- Department of Electrical and Computer Engineering, National Technical University of Athens, Iroon Polytechniou 9, Zografou 15773 (Greece)
- NCSR Demokritos, IMS, Aghia Paraskevi 15310 (Greece)
Injection molding Nd{sub 2}Fe{sub 14}B plastic bonded magnetic material is pressed into the form of cylindrical ring segments in order to investigate its performance when used in the manufacturing of stator poles of fractional power dc motors. Measurements of speed and armature current versus different load torques were performed. The experimental results obtained for stator poles made by three plastic bonded Nd{sub 2}Fe{sub 14}B magnetic materials of different densities, are compared to those results obtained by using a pair of typical barium ferrite stator poles. The torque versus speed curves, the obtained mechanical power versus speed and the efficiency of the motor as a function of the speed are presented. The torque speed data in high speeds follow a linear law, as is expected by theory, while at low speeds, below a crossover point, a deviation from this linearity appears. This is attributed to temperature effects. In this work it is shown that in the region of light loads and high speeds, at a certain speed, the injection molded Nd{sub 2}Fe{sub 14}B permanent magnet stators produce a higher electromagnetic torque, higher mechanical power, and higher efficiency than the barium ferrite ones. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 496552
- Report Number(s):
- CONF-961141-; ISSN 0021-8979; TRN: 97:016244
- Journal Information:
- Journal of Applied Physics, Vol. 81, Issue 8; Conference: 41. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 12-15 Nov 1996; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
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