HomoPolar Motor Explained

A "homoploar" motor is a motor that works with the need for a commutator. The commutator is used to switch polarity between pairs of poles of a motor. This motor has one pole, It the explanation uses the right hand rule where the thumb points in the direction of the current, the fingers are in the direction of the the b-field, and the palm is the push or the applied force. Current is defined as the flow of positive charge because positive charges flow from high energy to low.)

Category:

Education

Tags:

• mrwaynesclass
• right
• hand
• rule
• magnetic
• force
• homopolar
• motor

[WorldUtoPiA]

Well for starters you have the basics of this wrong. There is no flow from positive to negative, that was a huge mistake they made many decades ago.

Electrons are what is flowing here, and the flow from negative to positive.

[mrwaynesclass]

@WorldUtoPiA

I agree. I wish electrons were originally identified as being positive. But they are not. In physics, it is all about the flow of energy. Energy flows from high potential to low potential. A positive current in physics is defined as the flow of energy from high potential to low potential. This would correspond to the flow of positive charges, (or holes.) This video depicts that MODEL of flow using a positive charge as the carrier of the energy.

[jameshoyland]

@supermecis Sadly no. The electrons do indeed return to the battery as they do in any circuit. But having done so they have lost all the potential energy they had when they left it. The battery must transfer energy to the electrons so they can make the journey again. Eventually the battery will have no more energy to give.

[ganetube]

A motor works on electro-magetic interaction principles between two fields. The magnet provides one while the flowing current in the wire creates a second around it. As the two fields are at angles the first 'pushes' the other (similar to what you feel when like poles of 2 magnets come close) creating the rotation. If no magnet ...no interaction ...no force to rotate !

[sandslash123]

Why wouldn't it work without a magnet? Why do we need magnet there?

[alsalamaleykum]

@ActiveStorage

electric current runs through the surface only when it's AC current, because electro-magnetic field and induction is maximal inside of the wire, so wire becomes more resistive inside and current runs mostly outside...

[ActiveStorage]

electric current has 2 components. not just free electrons. does anyone know why electric current runs through the surface  of the wire and not through its core?

[rocketpro22]

you didn't explain it, you just showed a picture of one...... big difference

[supermecis]

So, if there is only one polarity, it means that the electrons who comes out the north pole of the battery are equals to those who goes back at the bottom (which is NOT a south pole) .... does it means that the case of a rotating wire the battery will never runs out of power, so the motor will work forever ??????

[simondegrootpuntnl]

Good job! In the netherlands we tend to use the "left-hand-rule". Fingers in current-direction / catch fieldlines in the palm / thumb is Lorentzforce.