For the power in case of a power failure, back electromotive force of a spindle motor can be utilized.
对于在电源故障情况下的电力，可利用主轴电机的反电动势。
At first we established a test platform, making parameters adjustment of the electric machinery, testing In-Wheel-Motor back electromotive force, torque and the nt curve.
首先搭建了试验平台，对电机进行了参数调节，测试了轮毂电机的反电动势、转矩和NT曲线。
On this basis, back electromotive force without load and with load is researched, simulated and analyzed, and cogging torque is analyzed and calculated in different dimensions of magnetic steel.
在此基础上，仿真了空载和负载下的电机反电动势，并且对不同磁钢尺寸下的定位力矩进行了分析计算。
Accordingly, a cogging torque and noise are reduced without reducing a back-electromotive force, thereby obtaining a high efficiency.
因此，在不减小反电动势的情况下减小了顿转扭矩和噪音，由此获得高效率。
The model test tried on this system did not use the tachometer generator but used rotor electromotive force instead to form the speed negative feed-back system.
本绕线式电动机转子电路脉冲调速系统模拟试验，省去了测速发电机，而利用转子电势组成速度负反馈系统。
Using the motor control special chip ML4428, the counter electromotive force detection and back-EMF commutation were realized.
所设计的无刷直流电机稳速控制系统用电机控制专用芯片ML4428实现了反电势的检测、换相和功率驱动；
Using the motor control special chip ML4428, the counter electromotive force detection and back-EMF commutation were realized.
所设计的无刷直流电机稳速控制系统用电机控制专用芯片ML4428实现了反电势的检测、换相和功率驱动；
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