What makes a DC motor unidirectional?

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frijoli
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What makes a DC motor unidirectional?

Post by frijoli » Sun Oct 15, 2017 10:47 am

I saw a brushed DC motor that says clockwise direction.
It is a two wire unit; red and black. Is it the shape of the brushes, or is it rectified in some manner?
Clay
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martyscncgarage
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Re: What makes a DC motor unidirectional?

Post by martyscncgarage » Mon Oct 16, 2017 11:36 pm

frijoli wrote:
Sun Oct 15, 2017 10:47 am
I saw a brushed DC motor that says clockwise direction.
It is a two wire unit; red and black. Is it the shape of the brushes, or is it rectified in some manner?
I would apply voltage to the leads, positive to red, negative to black. Observe the motor.
Then apply positive to black and negative to red. Observe the motor.

Do you know the terminal voltage of the motor?
Use a +12V power supply with adequate current for testing. You should be ok.

Marty
"Jack of all trades, master of none!"
Mesa, AZ

frijoli
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Re: What makes a DC motor unidirectional?

Post by frijoli » Tue Oct 17, 2017 6:41 am

Thanks Marty. I don't own it. I was looking through some stash at work.
I was just curious as I had not seen one before.
A guy I work with said the brushes are installed at an angle. That's all I know.
Clay
near Winston-Salem, NC
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eng199
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Re: What makes a DC motor unidirectional?

Post by eng199 » Tue Oct 17, 2017 3:52 pm

The commutator could also be set to have some lead angle. This would allow the motor to run faster in one direction.

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