4 ms·
motors are dead cheap- maybe 6x more than the cost of their weight in steel for non-PM motors. The problem is availability. Chinese factories don't sell in lo
by hwillis 9y ago
motors are dead cheap- maybe 6x more than the cost of their weight in steel for non-PM motors. The problem is availability. Chinese factories don't sell in low volumes.
- balfirevic 9y agoWould those be induction motors?
- hwillis 9y agoThe terminology around motors is... inconsistent. Induction motors are a specific kind of brushless motor with windings on both the stator and rotor, so named because it induces a current inside the rotor windings. Reluctance motors don't use permanent magnets or rotor windings and don't have rotor currents. Universal motors (which until very recently were absolutely ubiquitous in appliances) are commutated rather than inductively coupled and also don't have motors. There are a half-dozen other types but they're mostly novelties or variations on a theme.
- balfirevic 9y agoOh, I know about reluctance motors. I was wondering what kind is as cheap as you mentioned in your previous comment.
- hwillis 9y agoUniversal or DC motors for <300 W, induction for anything above that.
- baybal2 9y agohttps://www.alibaba.com/product-detail/switched-reluctance-motor-geared-motor-for_60321634955.html https://www.alibaba.com/product-detail/switched-reluctance-m... Take a note, while SRMs are very cheap, some vendors would bundle a some kind of constant torque motor driver circuit at very little extra https://www.alibaba.com/product-detail/60v-72v-1200w-switched-reluctance-motor_60413093044.html https://www.alibaba.com/product-detail/60v-72v-1200w-switche...