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Field Polarities of DC Machines

Field Polarities of DC Machines

The diagram above shows the polarity of interpoles with respect to the polarity of the main poles.
For a motor, the polarity of the interpole is the same as that of the main pole preceding it in the direction of rotation.
For a generator, the polarity of the interpole is the same as that of the main pole following it in the direction of rotation.

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