Hub motor wheel seizing after a few Km

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Njay   10 kW

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Hub motor wheel seizing after a few Km

Post by Njay » Sep 10 2018 1:13pm

Hello All,

A friend of mine has a chinese electric scooter (9KW hub motor) whose rear wheel started to seize after a few Km, it looks like it seizes due to warm up. Letting it cool a little it will spin freely again. I made a few searches but couldn't find anything similar, maybe I'm not using the right words. Any input on this, what may be the cause? The wheel starts seizing progressively until it gets completely blocked. After some time (cooling... we supose) it unblocks again.

Many thanks!
Last edited by Njay on Sep 10 2018 1:40pm, edited 1 time in total.

dustNbone   10 kW

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Re: Hub motor wheel seizing after a few Km

Post by dustNbone » Sep 10 2018 1:23pm

Sounds like it could be a short in the phase wiring. Might not short out until something heats up and expands. Inspect the wiring coming out of the axle first, most likely place to get a nick in the insulation.

Njay   10 kW

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Re: Hub motor wheel seizing after a few Km

Post by Njay » Sep 11 2018 6:08am

Thanks dust, but it is mechanical, that is, when it blocks, it blocks, it's not like a shorted motor resisting spinning, it just blocks and you're not able to spin it at all.

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flippy   10 kW

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Re: Hub motor wheel seizing after a few Km

Post by flippy » Sep 12 2018 9:53am

replace the bearings.

also when the motor seizes check the resistance of the phase wires. you might have a dead short. then the motor will not move unless you put a prybar on it. with smaller motors you can overcome this by hand, but with a 9kW motor you have way too much magnetic holding power to move it by hand.
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dustNbone   10 kW

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Re: Hub motor wheel seizing after a few Km

Post by dustNbone » Sep 12 2018 12:29pm

There's not really many possibilities. I would expect a seizing bearing to make a hell of a noise in the process, and get hot as all hell. You should be able to track that down pretty easy.

Phase short on a motor that size is gonna stop it, as flippy said. You ain't moving that by hand until it lets go.

Njay   10 kW

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Re: Hub motor wheel seizing after a few Km

Post by Njay » Sep 12 2018 5:25pm

Ok guys, thanks for the help. I'm going to pass on the information, let's see what will be found.

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amberwolf   100 GW

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Re: Hub motor wheel seizing after a few Km

Post by amberwolf » Oct 20 2018 10:04pm

So what was the problem?

Njay   10 kW

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Re: Hub motor wheel seizing after a few Km

Post by Njay » Oct 21 2018 8:00pm

I don't know, he decided to sell the motorcycle as is and bought an electric BMW.

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