Using magnetic sleeve can raise not only motor's efficiency and power factor but also the motor's torque.
而用磁性套筒改造电动机，不但可以提高电动机的效率、功率因数，而且其转矩比改造前也有所提高。
The saving energy control system is proposed for problem of oil drawing machine electric driver which efficiency and power factor is low.
针对抽油机电驱动装置效率和功率因数低、耗能严重的问题，研制了一台新型的抽油机节能控制系统。
Increasing core length properly can raise motor efficiency and power factor, but it will reduce locked-rotor torque ratio and breakdown torque ratio.
适当增加铁心长度可以有效提高电机效率和功率因数，但会导致启动转矩倍数和最大转矩倍数减小。
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