应限制启动次数，正确选用热保护，按电动机上标定的定额使用。
Should limit the number of activated, the correct choice of thermal protection, according to motor on the use of fixed calibration.
分析了不同转子磁路结构对电动机磁阻转矩的影响，确定了地铁用永磁同步电动机转子磁路结构的选用原则。
The influence of different rotor structure to the reluctance torque is analyzed, and given the selection principle of the rotor structure.
为改善地面操作起重机的起动、点动运行性能，可选用绕线型电动机加外延时继电器控制。
Slip-ring motor can be used in conjunction with time delay relays for floor operated cranes to improve their travelling quality during start and inching.
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