Teach you how to check the motor in DC motor stator polarity

1. Reversing polarity pole, a main pole to pole armature rotation direction should be accord with the following relations, DC motor: the main pole n > commutated n > main pole s; DC generator: main pole n > commutating pole s, master s pole, reversing n. test check the reversing pole polarity, with the main test very, like should be the main pole and the compensation winding is disconnected to prevent inaccurate measurement. For the small turn of the large cross section of the current should be greater than the number of current (no more than the rated value). For the odd number of the pole can be envisaged and not very short of even the same test check.

2. 对于并励绕组、他励绕组、串励直流电机的串励绕组、复励直流电机中的复励绕组的极性检查，可将各磁极串联起来，然后通过直流电源，用指南针在极靴中间测其极性，反复几次，由指南针指南或指北来确定磁极的极性。差复励直流电机的串级励绕组极性与并励绕组极性相反，而积复励直流电机则相同。在检查某种绕组极性时，其他各绕组应断开接线，否则也影响测试准确度。通入电压的高低应使直流电流的大小保证磁极的磁场有足够吸引指南针的能力。

. for the shunt field winding, he excitation winding, on excited DC motor series excitation winding, compound wound DC motor complex excitation winding polarity checking, a concatenation of the pole and through a DC power supply, with the compass in the middle of the pole shoe measured the polarity, repeated several times, by compass guide or refers to the north to determine the polarity of the magnetic poles. The difference of the series - wound winding polarity of the differential - excited DC motor is the same as that of the shunt winding. In checking the polarity of a winding, the other windings should be disconnected, otherwise it will affect the accuracy of the test. The high and low level of the input voltage should be the size of the DC current to ensure that the magnetic field of the magnetic pole is enough to attract the compass.

3. 检查补偿绕组的极性与检查换向极极性方法相同。要把换向极和主极绕组断开，由于补偿绕组是嵌入在主极极靴内，所以测试补偿绕组极性时应在换向磁铁上表示出来。

3 check the polarity of the compensating winding and check the polarity of the reverse polarity method. For the pole and the main pole winding, because the compensation winding is embedded in the main pole piece, so the test compensation winding polarity should be expressed in the direction of the magnet.

以上内容均根据学员实际工作中遇到的问题整理而成，供参考，如有问题请及时沟通、指正。

All of the above are based on the problems encountered in the practical work of the students, and to provide a reference, such as a problem, please timely communication and correction.