Max Safe Motor RPM

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Old 01-03-2012, 03:57 PM
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Default Max Safe Motor RPM

I was once told that electric motors should never go over 50,000 rpms. But I think that is a little low. Just wondering is there anyway to find out max motor rpm limits? Most of the manufactures don't seem to list this. I'm taking about the rpm limit the motor begins to destroy itself. Like I know your not supposed to fully spin up a free spinning motor. I also have a feeling different size motors have different rpm limits.

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Old 01-03-2012, 04:13 PM
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I would think that the windings would burn with the high voltages you would need to get the motors to spin fast enough to self destruct.
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Old 01-03-2012, 05:04 PM
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depends on the motor...

some of the Castle stuff has it on the end bell.

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Old 01-03-2012, 05:06 PM
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Originally Posted by CamZH View Post
depends on the motor...

some of the Castle stuff has it on the end bell.

Exactly. I read somewhere haha castle said 100,000 because over that rotating mass would cause mass destruction.
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Old 01-04-2012, 01:13 AM
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Originally Posted by CamZH View Post
depends on the motor...

some of the Castle stuff has it on the end bell.

Wow well that sure makes me look dumb. I checked the Tekin and Novak sites but did not look into anything Castle. Thanks for the pic as I do not have anything Castle. Is that a 540 size motor?
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Old 01-04-2012, 05:24 AM
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Looks like a 4pole sct3800kv yes 540
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Old 01-04-2012, 06:48 AM
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Typically, rotor integrity is indeed the limiting factor. I've had some fairly large rotors come apart on the dyno, and the results aren't pretty. There is not going to be a single rule-of-thumb; materials and design vary somewhat.

Bearing life is also a concern when it comes to motor longevity. Larger-diameter bearings are often thought of as "better", but they also have a higher surface speed and thus may be less tolerant of higher rotational speeds.
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