Hi John,
You have not been having a lot of luck recently by the sound of things, but at least I'm replying!
Is it the HPM 5000B or 3000B motor that you are using?
And is it just one spot out of the 24 rotor positions that it won't start in?
(I.e. a single 15 degree section out of the whole 360 degrees.)If it was a faulty Hall Sensor, phase wire or controller, I would expect there to be at least 4 or 8 positions out of 24
(every 90 or 45 degrees) where the motor wouldn't start.
I'm wondering whether a magnet may have come unstuck with the excessive heat if the temperature of the motor has been allowed to reach 150 degrees.
I don't know if there is enough room inside the motor to allow one of the magnets to be flung clear of the rotor if it came detached, but if this were possible I could see how you might have a single large segment
(possibly as large as 90~105 degrees) were the motor might not start because of the missing magnet.
Is there an unusual rubbing noise coming from the motor when you turn it manually?
From the pictures I have seen of the HPM5000B motor it appears to have eight magnets and 24 coils:
And the magnet's polarity runs from side to side through the thickness of the magnet like this:
I am not sure what the exact cause of your problem is, but I will try and get a message to GM and hopefully someone will contact you.
Alan P.S. If you have a copy of the data you sent to David perhaps you would be kind enough to forward it to my email address
(unless you want to post it on the forum) as I would be interested in seeing it.