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# Basic knowledge about the motor(11)

April 30, 2019

37. The calculation formula of the short-range coefficient is ky1 = sin(p/2×y1/t), and its physical meaning is that the short-distance causes the back EMF (or magnetomotive force) to be discounted (or reduced) compared to the whole distance. Coefficient). The calculation formula of the distribution coefficient is kq1 = sin(qa1 /2 ) / q / sin(a1 / 2), and its physical meaning is that when the q coils are in phase difference a1 electrical angle, the back EMF (or magnetomotive force) is relatively concentrated. The coefficient of reduction (or the discount).

38. Current transformers are used to measure current, and you cannot open the secondary side. The voltage transformer is used to measure the voltage, and the secondary side cannot be short-circuited.

39. A motor is a device that converts mechanical energy into electrical energy (or vice versa) or changes one AC voltage level to another AC voltage level. From energy conversion, motors can be divided into three categories: transformers, motors, and generators.

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