how to test rotors

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Old 01-18-2008, 12:09 PM
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Default how to test rotors

http://cgi.ebay.com/Gauss-Meter-Magn...QQcmdZViewItem

do you think this would work, they say they use them to match slot car motors?
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Old 01-18-2008, 12:28 PM
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Originally Posted by bigemike View Post
http://cgi.ebay.com/Gauss-Meter-Magn...QQcmdZViewItem

do you think this would work, they say they use them to match slot car motors?
It says:

The meter might be out ranged by some Neo traction magnets used in 1/32 scale cars.

If that is the case, it is pretty likely that the powerful Neo magnets used for our brushless motors will also exceed its range.
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Old 01-18-2008, 01:01 PM
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It didn't know what magnets were in the motors, but I know that the range would need to goto 2500~ range to work.
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Old 01-18-2008, 01:12 PM
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I'm curious if this thing does a decent job. I don't need exact number, I just need to know when a rotor sucks and when it doesn't. I can't remember which ones are new.

http://rc4less.com/Motors,_Brushed_&...duct_info.html

I decided to take a chance and order one. I'm not expecting much, so if it works at all, I'll be pleasantly surprised.
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Old 01-18-2008, 01:15 PM
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I know some of the numbers quoted to me by guys at the Novak were ~1300, so that ebay meter may work (-1600 to 1600 range). I don't know if $129 is a good price to find out though.
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Old 01-18-2008, 01:26 PM
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the 'neo traction magnets' they mention are the super powerful neodynium magnets on the bottom of slot cars for holding the car onto the track. more powerful than RC motor magnets by far!
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Old 01-18-2008, 05:59 PM
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Originally Posted by joe of loath View Post
the 'neo traction magnets' they mention are the super powerful neodynium magnets on the bottom of slot cars for holding the car onto the track. more powerful than RC motor magnets by far!
It's spelled Neodymium (A.K.A rare earth). Today's brushless rotors are made with Neodymium.
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Old 01-18-2008, 08:48 PM
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The Zubak meter seems to be what all the oval guys use. At $279, it's pricey. I'm hoping that RC4LESS meter just lets me know when one is good or bad, I don't care about racing numbers. I'm not convinced the very most powerful rotor means a thing. I do think extremely weak rotors can be a problem, though.

http://www.hobbytalk.com/bbs1/showthread.php?t=187017
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Old 01-19-2008, 09:34 AM
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Would it not be easier to measure the torque required to spin rotor while it is still inside the motor?

To compare different rotors anyway.

I do a rough feel test but I wonder if their is a very sensitve torque gauge available somewhere.

Something like this http://cgi.ebay.co.uk/Tohnichi-BTG-B...QQcmdZViewItem
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Old 01-19-2008, 01:25 PM
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Originally Posted by James35 View Post
It's spelled Neodymium (A.K.A rare earth). Today's brushless rotors are made with Neodymium.
close, i didn't have my periodic table to hand
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