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Question:

Dc motor input direct current, after the commutator, does it change to alternating current?

Dc motor input direct current, after the commutator, does it change to alternating current?

Answer:

This. Don't know if you have seen direct current (dc) and alternating current waveform figure. Ac three phase similar to sine and cosine curve, and the dc voltage to a straight line, stable. Alternating current (ac) can be used to direct drive motor, because of the ac voltage is constantly changing, cause the direction of the magnetic field is constantly changing. But the direct current (dc) must pass the commutator can cause changes in the direction of the voltage, so that the motor rotation, this time you go to see a waveform diagram, is then a concave, convex, instantaneous changes, the current more precisely, so the general accuracy is higher, all like to use dc, especially for dc micro-motor.
Dc series motors can be used for communication. In theory, the motor is the same, but I haven't tried it myself. Dc has direct current, communication is good. Otherwise you're only developing one.
Generally speaking, dc brushless motor is a kind of ac motor, which is consistent in principle. But the alternating current is a positive, and the direct current is a trapezoidal wave. If you would have a ac electric flux to the dc motor, the first thing to remove the dc motor commutator, and want to ensure that the correct wiring, but also the size of the control current, prevent motor burn out.

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