1. “Manufacturers, environmentalists agree on national appliance standards,” Air Conditioning, Heating and Refrigeration News , 1 21, August 18, 1986
2. Zijlstra , H. “Application of permanent magnets in electromechanical power converters: The impact of Nd-Fe-B magnets,” J. Physique , pp. C6-3-C6-8, September 1985
3. Synchronous machines with rotating PM fields;Strauss;AIEE Trans.,1952
4. Design considerations of fractional horsepower size permanent magnet motors and generators;Herschberger;AIEE Trans.,1953
5. Machines of medium-high rating with a ferrite-magnet field;Volkrodt;Siemens Review,1976