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Archive for Permanent magnet motors

Reversing the direction of rotation of motors?

I have a couple question about reversing the direction of rotation of motors.
1. How is a capacitor-start motor reversed?
2. How are DC permanent-magnet motors reversed?
Thanks a lot!
I’m pretty certain that in both cases you just reverse the polarities. Definitely in the DC one. Not a hundred percent sure about your "capacitor-start motor".

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Latest Permanent Magnet Motors Auctions

Hey, check out these auctions:
Cool, arent they?

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PHYSICISTS! I Can you make a motor using permanent magnets? Doesn’t it break the law of conservation energy?

I saw this on you tube. Where is the energy coming from??????? And if this is real why can’t we use this for cars???? I think that they have some guy with an electric motor hooked up to it.. http://www.youtube.com/watch?v=YvHb41KP7To

I watched all the videos.
In the first video, the demonstrator spins the device and claims that [...]

Can I run a 12V DC motor on 24V?

I have a 12V DC motor (permanent magnet) that has a current draw of 60 amps. Can I run it safely on 24V or will I fry it?
You can run it safely for a couple of minutes. Then it will be fried.
Seriously… you will need a switching down converter to run that [...]

what type of magnets are used in ……..permanent or temporary?

we use permanent magnets in d.c. motors,but what kind of magnets do we use in eye treatment,electric bell and relays.permanent or temporary?
In big electric DC motors, "temporary" magnets are used, only in small ones are permanent magnets used.
Electric bells and relays use different forms of electromagnets (temporary).
I’ve never heard of any magnet used in eye [...]

Does the magnet affect the power of a motor?

In any electric motor that uses permanent magnet poles, does the strength of the magnets affect the power output of the motor?
Let say I have two different motors that are almost exactly the same, but one uses more powerful pole magnets, if I pass the same current through each one, which one will run [...]

how many blades are best for a wind turbine?

how many blades does a wind turbine need? some have three others have four. What is best? Mine has four and is 3ft and homemade it runs from a permanent magnet dc motor is it best to have three blades or four for best output?
My husband works on the commercial wind turbines. THE most [...]

what is the function of the permanent magnet in an electric motor?

It provides the magnetic field which (in combination with rotation) is the basis for generating voltage in the motor. By the way motors do not have to have permanent magnets, indeed most and especially larger ones, use electromagnets to generate the field.
EDIT: to gintable: No Bramble did not speak just about a generator. In [...]

Will running a homemade wind turbine without a load hurt it?

I’m in the process of building my first wind turbine and was curious if running it without a load (ie. battery bank) would be harmful to the generators? I’m using a 260VDC 5A permanent magnet treadmill motor as the generator. I’m about ready to put up my tower and wasn’t sure if I can go [...]

Will this set up with permanent magnets create heat through induction?

Suppose I have two permanent magnets at opposite sides of an imaginary circle, and in the middle of the circle, between the magnets, is a piece of iron attached to a stick attached to a motor. When the motor starts spinning the iron, will it heat up at all like in a typical induction [...]

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