I'm running a "1606" 9c motor, from Grin Cyclery ( ebikes.ca ) and am starting to become interested in the true limits of it.
The magnet wire coating isn't a large concern because I'm rewinding a motor with high temperature coating. The hall sensors I'm not too worried about, as they're easy and cheap to replace. My main concern is the magnets. Does anyone know what temperature you can take these too before they become damaged? I know there's different grades of these rare earth magnets, but so far I've only heard people say they're good from between 80 to 100 C. That's alarmingly low, and I wouldn't be surprised if I've already surpassed those temperatures once or twice. Does anyone have any information on the temperatures these magnets can take? Also, any guesses about the relationship between temp at windings, and temp at magnets? Suppose my thermister measures 120 C at the windings, can I safely assume the magnet temp is still only 90C or something?
The magnet wire coating isn't a large concern because I'm rewinding a motor with high temperature coating. The hall sensors I'm not too worried about, as they're easy and cheap to replace. My main concern is the magnets. Does anyone know what temperature you can take these too before they become damaged? I know there's different grades of these rare earth magnets, but so far I've only heard people say they're good from between 80 to 100 C. That's alarmingly low, and I wouldn't be surprised if I've already surpassed those temperatures once or twice. Does anyone have any information on the temperatures these magnets can take? Also, any guesses about the relationship between temp at windings, and temp at magnets? Suppose my thermister measures 120 C at the windings, can I safely assume the magnet temp is still only 90C or something?