Ev motors, gears and back EMF
Discussion
Many moons ago I started a degree in electrical and electronic engineering (but dropped out to do software instead).
One thing I remember from the power engineering where we did motors was that as the load and or rpm of the motor increased, I can't remember which, the was a back emf force generated where eventually the motor stops being able to Rev faster or produce more usable power. I recall having to hold thumb and two fingers at right angles to do field, current & force but it escapes me which was which. And you used left or right hand depending on whether it was generating or running as a motor.
It makes me wonder that although all current EVs are single gear they would benefit from having a cruising gear. Or maybe they just pick a final drive ratio to get a decent top speed and the acceleration isn't affected add the torque is flat from zero. Kind wish I'd stayed on now. Think electric motors are where the money will be forel the next few years.
Might be a bit technical for PH. But in 10 years instead of talking valves and plug gaps I think a lot of people will be talking about armature windings, CMax and reduction ratios. Or something.
One thing I remember from the power engineering where we did motors was that as the load and or rpm of the motor increased, I can't remember which, the was a back emf force generated where eventually the motor stops being able to Rev faster or produce more usable power. I recall having to hold thumb and two fingers at right angles to do field, current & force but it escapes me which was which. And you used left or right hand depending on whether it was generating or running as a motor.
It makes me wonder that although all current EVs are single gear they would benefit from having a cruising gear. Or maybe they just pick a final drive ratio to get a decent top speed and the acceleration isn't affected add the torque is flat from zero. Kind wish I'd stayed on now. Think electric motors are where the money will be forel the next few years.
Might be a bit technical for PH. But in 10 years instead of talking valves and plug gaps I think a lot of people will be talking about armature windings, CMax and reduction ratios. Or something.
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