Title :
Performance comparison of U-core and round stator single phase permanent magnet motors for pump applications
Author_Institution :
Hochschule fur Tech. und Wirtschaft des Saarlandes, Saarbrucken, Germany
Abstract :
Strontium ferrite based permanent magnets are attractive for applications in electric machines due to several reasons. Their price is some two orders of magnitude less than the price of rare earth magnets. They are chemically inert, which makes them suitable for applications in aggressive environments. Strontium ferrite magnets have high specific electric resistance, so they do not experience thermal problems due to eddy current losses. On the other hand, their low residual flux density imposes the need for special machine construction when high air gap flux density is needed. It is shown in this paper how a synchronous motor with strontium ferrite permanent magnets can efficiently replace an induction motor in low power applications, and why a round stator is a clear winner against a U-core permanent magnet motor
Keywords :
air gaps; electric resistance; magnetic flux; permanent magnet motors; pumps; rotors; synchronous motors; U-core; chemically inert permanent magnets; eddy current losses; high air gap flux density; high specific electric resistance; low residual flux density; pump applications; round stator; single phase permanent magnet motors; strontium ferrite permanent magnets; synchronous motor; Chemicals; Eddy currents; Electric machines; Electric resistance; Ferrites; Permanent magnets; Stators; Strontium; Synchronous motors; Thermal resistance;
Conference_Titel :
Industry Applications Conference, 1999. Thirty-Fourth IAS Annual Meeting. Conference Record of the 1999 IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-5589-X
DOI :
10.1109/IAS.1999.801657