How to check the DC motor stator pole polarity

The shunt winding, for he winding, series excited DC motor series field winding,compound wound DC motor in the compound winding polarity check, the magnetic pole can be connected in series, and then through the DC power supply, measuring the polarity in the pole shoe middle compass, repeated several times, by the guideneedle guide to determine or North polarity magnetic pole. Differential compoundwound DC motor cascade winding polarity and shunt winding opposite polarity, and the cumulative compound DC motor is the same. In the examination of some winding polarity, other each winding shall disconnect the connection, otherwise also affect the testing accuracy. Pass into the voltage level should make direct current magnetic polemagnetic field size guarantee ability enough to attract the compass.

The reversing the main polar, polar polarity armature rotation direction should be consistent with the following relations: the main pole N, DC motor, commutation pole n,a main pole S; DC generator: the main pole N, commutating pole s, main pole S,reversing polarity n. test to check the commutating pole polarity, the same test methodthe main pole, should be the main pole and the compensation winding is disconnected, in case of inaccurate measurement. For the current commutating winding turns is less a large section of the access to be a large number (not more than ratings). For odd commutating pole can be envisaged and no shortage ofextremely even timely the same test check.

Reversing the polarity and check the compensation winding polarity method for the same. To put the commutating pole and the main pole winding is disconnected, thecompensation winding is embedded in the main pole shoe, so the test compensationwinding polarity should be expressed in reversing the magnet.

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