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Old 04-29-2009, 09:25 PM   #1
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Default Brushless Bearing Holder Design vs. Fried motors

Just a question here (not bashing any companies). Has anyone here fried a brushless motor? More exactly, the motor windings are not fried, but the rear bearing housing warped due to extreme heat. Some companies, such as Novak and Orion, house their rear bearings in a plastic/composite material. Under extreme heat, these will warp and cause the rotor to feel sluggish or melted in the can (due to the bearing alignment becoming off center). Motors such as SpeedPassion and Trinity house both bearings in aluminum. So they do not have this problem. I'm wondering if this is designed into the motor. Just a question. Not a flame.
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Old 04-30-2009, 02:44 PM   #2
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I'm pretty sure that that's my issue with my Novak 17.5. Seems like it's binding on something, but haven't been able to figure out what.
If someone who knows about this could chime in, that would be awesome. I liked that motor.
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Old 04-30-2009, 06:29 PM   #3
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A friend thought he fried his Novak 13.5. Felt like the rotor was stuck in sticky goo when he tried to turn the rotor by hand. I took it apart and found that the rear bearing holder/sensor housing was very slightly warped. I put the motor back together, then loosened the 3 rear screws on the back of the housing, the rotor turned freely, but you could feel it warp/wobble when you turned the rotor. I tightened the screws down just tight enough to hold timing, but not tight enough to "goo" up the rotor. So it's a "backup" motor for now.

With the SP and Trinity motors, you'll just fry the windings when they let go.
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