Bipolar electric motor | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-01-18

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Bipolar_electric_motor


00:00:35 1 Early motors
00:03:02 2 Electric railway locomotives
00:06:13 3 Modern bipolar motors
00:06:55 4 Toy motors



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SUMMARY
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A bipolar electric motor is an electric motor with only two (hence bi-) poles to its stationary field. They are an example of the simple brushed DC motor, with a commutator. This field may be generated by either a permanent magnet or a field coil.
The 'bipolar' term refers to the stationary field of the motor, not the rotor. The rotors often have more than two poles, three for a simple motor and potentially more for a high-power motor. A two-pole rotor has the disadvantage that it is not self-starting in all positions and so requires to be flicked to start.