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Please help me determine which motor to use


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rjw



Joined: 04 Jul 2010
Posts: 110
Location: Miami, Fl. USA


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Please help me determine which motor to use

Below is a picture of 2 small brushed motors.

The one on the right is what I am used to seeing (permanent magnet)

What's up with the one on the left

1) motor on left has s 2 piece magnet with very little magnetizm, plus a much larger rotor

kv is around 1500 wjile motor on right is around 200 kv

Both are rated at similar torque, and neither has true brushes.

TIA

Post Wed May 29, 2013 12:26 pm 
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Glen
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Joined: 16 Jun 2004
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Wierd! one on the left looks like a CD-ROM style motor where the magnet is just polarised on either side. Doubt it would be very powerful at all as a result, but not too sure really.
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Post Wed May 29, 2013 12:32 pm 
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rjw



Joined: 04 Jul 2010
Posts: 110
Location: Miami, Fl. USA


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Actually, they were bioth supposed to have almost identical characteristics, but it turns out that the wierd one has the same torque, but different kv

Motor on left is around 1500 kv while the other is 2200kv

Post Wed May 29, 2013 12:40 pm 
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Valen
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Joined: 07 Jul 2004
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left one is simpler to make at the expense of more material.
in *theory* the left one should have *more* magnetic power, theory and china often differ even more than theory and practise ;->

Oh as for which to use, if its in robots, the one on the left would probably have less of an issue with the magnets smashing out of them.
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Post Thu May 30, 2013 6:33 pm 
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rjw



Joined: 04 Jul 2010
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So, you have seen this type of full circle magnet before?

Post Thu May 30, 2013 6:42 pm 
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Valen
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yeah, not common. the ring itself is harder to make, in theory it needs to be heated and magnetised as one piece.
I don't know why but I'm feeling its an older school way of making them.
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Post Thu May 30, 2013 6:46 pm 
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rjw



Joined: 04 Jul 2010
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Location: Miami, Fl. USA


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the only real reason that I am liking it is that I've had magnets break or come loose before (rare), and this seemd a bit more robust than 2 magnets

Post Thu May 30, 2013 6:55 pm 
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