Electric Motors/Battery Power, etc.
Electric Motors/Battery Power, etc.
(OP)
Let me preface this by saying that electric or battery power for cars is NOT my specialty. However I would be interested in the pros and cons of a "power wheel", ie a powered wheel where the motor provides motive power, regeneration and, braking in one unit. Given a computerized control system, this would seem to be an ideal way to power a small commuter type car or bike.
One drawback would be heat dissapation. What else?
One drawback would be heat dissapation. What else?
RE: Electric Motors/Battery Power, etc.
RE: Electric Motors/Battery Power, etc.
RE: Electric Motors/Battery Power, etc.
RE: Electric Motors/Battery Power, etc.
my email is roddav@msn.com
Since i'm 'kinda' slow on the uptake, anything at this point will help.
Thanks, Rod
RE: Electric Motors/Battery Power, etc.
RE: Electric Motors/Battery Power, etc.
RE: Electric Motors/Battery Power, etc.
If you decide to forego the electric braking, or use a mechanical brake for serious braking, then a wheel motor seems to me to be an efficient solution. The proviso is that by its nature the windings will be fairly large, hence heavy, hence expensive.
Honda make a wheel motor for bicycles, which is a nice self contained unit, and is fairly efficient. I have only seen it in Japan. For my own electric bike I will be using a small high speed motor with a chain reduction.
Cheers
Greg Locock
Cheers
Greg Locock
RE: Electric Motors/Battery Power, etc.
One point is Safety is a big issue. A brake-by-wire system would never be used alone without some sort of a backup system. What happens if you lose power to the control module (it is only 1 wire)? NO BRAKES! There are regulations on this issue.
One question for Schiao: You mention hybrid and electric vehicle use in large trucks and busses, but they require lots of torque and power. Especially pulling a full load up a long grade! I would think that for large trucks and busses, electric drive systems would have a hard time providing the power relative to the typically used turbo diesel. You would need a lot of battery power to drive some high torque / high speed motors. I would think hybrids would be ok, but pure electric would be difficult. Any comments?
RE: Electric Motors/Battery Power, etc.
You are totally correct. The only totally electric projects we have dealt with are vehicles like trams or short range delivery truck. Any other trucks/buses are hybrids.(fuel cells, diesel, gasoline, CNG, LPG,..., etc.) And all our vehicles do have air braking along with regen systems.