Originally Posted by
helmuth_hubener
Yeah, it's gotta be the motor. Though, not necessarily the motor itself. I recently fixed the motor of a workbench grinder wheel by simply bypassing the heat-overload capacitor. Don't know if dryers have those, but power tools often do.
Get out your multimeter, and utility knife to cut little nicks in the wire sheathing, and check the voltage here, there and everywhere you can think of to see if there's a drop or something fishy.
If it's heating up more than it should (is there a fan attached to the motor? If so it may be designed that way and dependent on the fan to keep it cool, like an angle grinder) that could mean it's misaligned inside and so if you have no stress about getting it back working ASAP and enjoy messing around you could disassemble the motor housing itself and see if you can resurrect it with some tinkering or fiddling. Nice thing is, there's only so much that can go wrong with those brushless motors (thanks, Tesla!). If it's not misaligned, the last possibility is the wires have overheated so much, they've melted through their plastic coating somewhere and caused a short, messing up all the fancy phase synchronization and causing, potentially, a wrong speed such as you describe. If that's the case, you could get the correct type of wire and rewind it! Again, this is if you want to do some repairing for fun and personal enrichment.
Try "kick starting" it, giving the spindle an extra push of speed instead of drag and see what happens.
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