Hi, I'm thinking through a KISS ev conversion for a motorcycle. regen seems complicated (and not as efficient as coasting) so I want to focus on being able to coast well, but would like to leave out the mechanical freewheel/sprag clutch if the motor will freewheel on its own well enough.
Do PM motors, even if they are not connected to anything, create significant drag when overrun? With more rotational mass and/or rpm would the cogging effect cancel out (the pull into cogged position is canceled by the pull to stay in position on average?). I have heard that they do create drag with the magnets there, perhaps with some very fancy controller (and position sensing) it could be canceled out, but that doesn't sound simple.
Do sepex motors freewheel nicely by de-energizing the field (and the armature of course) ?
Thx!
Do PM motors, even if they are not connected to anything, create significant drag when overrun? With more rotational mass and/or rpm would the cogging effect cancel out (the pull into cogged position is canceled by the pull to stay in position on average?). I have heard that they do create drag with the magnets there, perhaps with some very fancy controller (and position sensing) it could be canceled out, but that doesn't sound simple.
Do sepex motors freewheel nicely by de-energizing the field (and the armature of course) ?
Thx!