IEEE standard is the most stringent standards are recognized around the world to measure motor efficiency criteria.

IEEE标准是目前最严格的标准，被全世界公认为衡量电机效率的评判标准。

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But the step motor efficiency is low, the ability is not big, load drag pulse equivalent cannot too big, speed range is not big.

但步进电机的效率低，拖动负载的能力不大，脉冲当量不能太大，调速范围不大。

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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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Because the drive generates this power at a time distinct from when the motor is running, it should not be considered an energy efficiency measure.

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