What reverses the polarity of electromagnets in speakers and motors?

Question

In electric motors and speakers and other devices using an electomagnet or solenoid, what is it that switches the polarity of the magnet?

I know how electomagnets and the left-hand rule work. But what is in the devices that switches the poles? I know it changes the direction of the DC but how does it do that?

Answer 1

Please refer to my in-depth explanation in your earlier question.

19 NOV 06, 0046 hrs, GMT.

Answer 2

Electromagnets can frequently be biased in both instructions. some would include an everlasting magnet and the DC power supplementations that rigidity or nulls-it counting on the layout and criteria. If what you try to attain is available or not is a question of how the electromagnet and different aspects were designed oftentimes the electromagnet is only a latch to keep the door locked, it does not unavoidably provide the retaining rigidity in case you may raise 1200 LBS, no difficulty, junk yards have electromagnets that %. up tones wish this authentic solutions your question Guru

Answer 3

In motors there is a wiring pattern for reversal.
Speakers the voice is AC not dc,u don't want DC to flow through the speaker coil. Speakers have polarity just like batteries. I was in a broadcast station and the record didn't have voice. the voice was equal in each speaker but the reverse polarity.

Answer 4

Motors have a split-ring commutator. It just briefly disconnects and then reconnects as the motor spins, and as it spins it connects to the opposite polarity.

Answer 5

in many cases it is alternating current

Answer 6

permission for u-turn