MMM demagged my Novak motor

[SpEEdyBL]

Originally Posted by What's_nitro?

The 180*C is most likely the rating of the insulation on the magnet wire used in the stator coils. The magnets on the rotor won't be able to take anywhere near that before they demagnetize. I've demagnetized HDD magnets (same kind) and I could still hold them in my hand. I don't think anyone has ever had an HV rotor come loose from the shaft. The rotor isn't large enough in diameter to torque itself off. The MMM does allow more current to pass through the system, and so more power. Everything will get hotter, faster, so you just need to watch the temps more closely. If you have another HV motor, try adjusting your gearing.

If you buy a novak rotor separately, the rating is 180C or 200C, so I am sure this is the temperature rating for the magnet itself, unless it was a typo and they meant farenheit. It is considered a "high temperature" rotor nonetheless.

I do plan on replacing this motor with a tamer 7.5 so i can use more pinion gears when the castle-neu motors become available. Meanwhile, I have my old 1/8" shafted rotor back in my 4.5 and it works fine.

[Hakan_J]

I used to have a Lehner 1940/8 with a mamba max. Unfortunately my MM died so I got the Monster Max instead. I had run my Lehner for about a year on the MM and it was working great. The first time I took my buggy to the track with the MMM my Lehner fried! Im not saying that my MMM killed my Lehner but it does seem a strange coincidence? I am now running a Tekno NEU instead.

Are the more people out there with a similar experience?