Username1
100 W
- Joined
- Nov 26, 2013
- Messages
- 168
Although I’m still very noob, I like researching and learning about different motor types and how they work...
For example this image I found which I believe is a single phase PM out-runner. But I have a few questions...
- Woundn’t this motor provide very high torque/power considering A: poles are both attracting and repelling at the same time (like all PM motors) B: all poles are active 100% of the time (just switching polarity), while always affecting 100% of the magnets?
- Aren’t these motors much simpler in almost every way to 3 phase PM motors? Number of phases/poles/wires/magnets, simpler to control (simply switch polarity on the single phase at the correct time) etc.
- I believe these motors can’t be gaurenteed to self start in the correct direction, but I don’t see how that matters on an ebike or similar (simply start rolling yourself, this is even a purposely added safety feature on some electric kick scooters).
- Am I incorrect in how I’m understanding these to work with my limited knowledge? Are there other downsides I’m missing, and why aren’t these used?
For example this image I found which I believe is a single phase PM out-runner. But I have a few questions...
- Woundn’t this motor provide very high torque/power considering A: poles are both attracting and repelling at the same time (like all PM motors) B: all poles are active 100% of the time (just switching polarity), while always affecting 100% of the magnets?
- Aren’t these motors much simpler in almost every way to 3 phase PM motors? Number of phases/poles/wires/magnets, simpler to control (simply switch polarity on the single phase at the correct time) etc.
- I believe these motors can’t be gaurenteed to self start in the correct direction, but I don’t see how that matters on an ebike or similar (simply start rolling yourself, this is even a purposely added safety feature on some electric kick scooters).
- Am I incorrect in how I’m understanding these to work with my limited knowledge? Are there other downsides I’m missing, and why aren’t these used?