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chrisd1972 · 08-08-2016, 02:38 PM

So my son's motor on his pattern plane picked up a bit of metal somewhere - might have been a grub screw that came loose.

Anyway one of the stators got a bit of damage and it looks like the bit of metal also rubbed up against a few of the windings.

So, need an educated opinion regarding the motor - pic of damage attached.

Is it ok to continue using as is?

Should I get it rewound?

Should it go into the bin?

Thanks

1BOHO · 08-13-2016, 03:16 PM

AXi ?

chrisd1972 · 08-13-2016, 11:42 PM

yes, axi

1BOHO · 08-14-2016, 01:23 AM

Now that the debris has been removed if the can can freely rotate around the stator and the magnets haven't been damaged I wouldn't throw it away if it were me. If you believe the coils to be damaged they could possibly short on the stator and damage the controller, so I'd rewind it if that is indeed the case and run a few test before putting it back into service. I'm quite sure the damage to the stator may have some effect but how significant would be hard to tell without various testing. Just looking at it I doubt it would be terribly significant but If you don't have anything to test it but a DMM you can put the meter on the ohms setting and place a lead on the side of the stator and another on the motors wires and look for zero ohms reading. That would indicate a short between it and the stator. So you know you would have to rewind it at a minimum. I'd gently try to bend those hammers back out without damaging more and personally I wouldn't mind looking at it's BEMF if possible but I'd have a real hard time just chunking it. Ultimately it's your call. Maybe someone else may have a difference of opinion. If you need help with it LMK. What model, KV, and wind is it by the way?

Krager · 08-14-2016, 02:15 AM

Can't tell for sure from the photo, but it looks like there's some damage to the windings. You'd have to check for shorts to the stator at least. If it were me and I was trying to salvage that motor I'd remove the windings and try to bend the stator back. Or I'd cut the bent part off. Then I'd use some epoxy to re-coat the exposed metal where the windings wrap.

I don't think you'll be able to straighten anything without removing the windings or you'll just end up damaging them if they are not already. Just running it as is would probably be risky for shorts which can take out an ESC. Though if you check it and are confident the windings are okay it might be fine.

There's a way to check the wire turns aren't shorting to each other by using a 4 wire Ohms measurement. That just means you check resistance with a voltmeter and ammeter then divide volts over amps. That's the easiest way to measure low resistances accurately if you don't have a milli-ohmeter.

08-08-2016, 02:38 PM	#1 (permalink)
chrisd1972 Registered Users Join Date: Jun 2012	Is this motor still good to use? So my son's motor on his pattern plane picked up a bit of metal somewhere - might have been a grub screw that came loose. Anyway one of the stators got a bit of damage and it looks like the bit of metal also rubbed up against a few of the windings. So, need an educated opinion regarding the motor - pic of damage attached. Is it ok to continue using as is? Should I get it rewound? Should it go into the bin? Thanks Attached Thumbnails kylenlord likes this.

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08-13-2016, 03:16 PM	#2 (permalink)
1BOHO Registered Users Join Date: May 2014 Location: Research Triangle Park	AXi ?

08-13-2016, 11:42 PM	#3 (permalink)
chrisd1972 Registered Users Thread Starter Join Date: Jun 2012	yes, axi

08-14-2016, 01:23 AM	#4 (permalink)
1BOHO Registered Users Join Date: May 2014 Location: Research Triangle Park	Now that the debris has been removed if the can can freely rotate around the stator and the magnets haven't been damaged I wouldn't throw it away if it were me. If you believe the coils to be damaged they could possibly short on the stator and damage the controller, so I'd rewind it if that is indeed the case and run a few test before putting it back into service. I'm quite sure the damage to the stator may have some effect but how significant would be hard to tell without various testing. Just looking at it I doubt it would be terribly significant but If you don't have anything to test it but a DMM you can put the meter on the ohms setting and place a lead on the side of the stator and another on the motors wires and look for zero ohms reading. That would indicate a short between it and the stator. So you know you would have to rewind it at a minimum. I'd gently try to bend those hammers back out without damaging more and personally I wouldn't mind looking at it's BEMF if possible but I'd have a real hard time just chunking it. Ultimately it's your call. Maybe someone else may have a difference of opinion. If you need help with it LMK. What model, KV, and wind is it by the way?

08-14-2016, 02:15 AM	#5 (permalink)
Krager Registered Users Join Date: Dec 2014 Location: Seal Beach, CA	Can't tell for sure from the photo, but it looks like there's some damage to the windings. You'd have to check for shorts to the stator at least. If it were me and I was trying to salvage that motor I'd remove the windings and try to bend the stator back. Or I'd cut the bent part off. Then I'd use some epoxy to re-coat the exposed metal where the windings wrap. I don't think you'll be able to straighten anything without removing the windings or you'll just end up damaging them if they are not already. Just running it as is would probably be risky for shorts which can take out an ESC. Though if you check it and are confident the windings are okay it might be fine. There's a way to check the wire turns aren't shorting to each other by using a 4 wire Ohms measurement. That just means you check resistance with a voltmeter and ammeter then divide volts over amps. That's the easiest way to measure low resistances accurately if you don't have a milli-ohmeter.

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