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为使抽水蓄能机组在水泵运行时提高抽水效率,在结构上采用了双转速的电机。双转速电机的转子为了变换两种转速,就得改变转子极数。例如,当水头H<47米时,设计为250转/分,转子为24极,当水头H>47米时,变速为273转/分,转子为22极。转子变速的方法:设计了大小磁极,利用气动隔离开关改变极数。为此,就无法用普通的磁轭叠片方法来组成磁轭。因为磁极的极距是不等的,且有大小之分,因此造成
In order to make the pumped storage unit improve pumping efficiency when the pump is running, a double-speed motor is used in the structure. Double speed motor rotor in order to change the two speed, you have to change the number of rotor poles. For example, when the head H is less than 47 meters, it is designed to be 250 revolutions per minute and the rotor is 24 poles. When the head H is 47 meters, the speed is 273 revolutions per minute and the rotor 22 poles. Rotor speed method: the size of the pole design, the use of pneumatic isolation switch to change the number of poles. For this reason, the conventional yoke lamination method can not be used to form the yoke. Because the pole pitch is not equal, and the size of the points, resulting