INNOVATIVE MOTOR DESIGNS WITH RESPECT TO HIGH COST-EFFICIENCY RATIO
 
HELMUT HANS, MARKUS KLÍPZIG, VLADIMIR V. POPOV
   
Abstract:
Some motor designs are well known for a long time but due to new materials and technologies those could be significantly refreshed. The appearance of rare earth permanent magnets in the seventies of the 20th century opened a lot of new opportunities for the design of electrical motors. But due to the high share of the motor material cost caused by these magnets there is a need to find designs which allow less expensive solutions. Usually the magnet price is strongly dependent on its shape. For complicated shapes the manufacturing process cost may overcome the same of raw material. That is why bars are more likely than rings. Due to this fact there is a necessity to find out optimal designs which use simple shaped magnets. The development of such designs becomes more important because of its complexity. For example such an effective way of optimisation like the skewing of a rotor magnet is no more applicable. This paper presents some solutions of such problems.
   
Key Words: bar-shaped permanent magnets, cost-efficiency ratio, permanent magnet motors.
   
 
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