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Urbane Guerrilla · 12-31-2005, 01:54 AM

Don't use a CVT in an electric final drive when you can have the series-wound motor. I understand this type does not need a transmission and its friction/heat losses because it develops high torque at near zero rpm. Useful for the motor-at-wheel kind of installation most electrics seem to be using.

Gravely brand power mowers also used a pretty feeble CVT back in the day. I used to wrestle one of the things as a teenager. The moving wheel was rubber-tired, the fixed wheel was steel. Power? -- not. This alleged self-propulsion was of some help getting the great heavy thing moving, but hell, I could push the thing along on my own legs two times faster than it could drive itself. Maybe the drive was prone to slippage, as I certainly never stalled it from (relatively) high speed that I can recall.

12-31-2005, 01:54 AM	#60
Urbane Guerrilla Person who doesn't update the user title Join Date: Jul 2002 Location: Southern California Posts: 6,674	Don't use a CVT in an electric final drive when you can have the series-wound motor. I understand this type does not need a transmission and its friction/heat losses because it develops high torque at near zero rpm. Useful for the motor-at-wheel kind of installation most electrics seem to be using. Gravely brand power mowers also used a pretty feeble CVT back in the day. I used to wrestle one of the things as a teenager. The moving wheel was rubber-tired, the fixed wheel was steel. Power? -- not. This alleged self-propulsion was of some help getting the great heavy thing moving, but hell, I could push the thing along on my own legs two times faster than it could drive itself. Maybe the drive was prone to slippage, as I certainly never stalled it from (relatively) high speed that I can recall. __________________ Wanna stop school shootings? End Gun-Free Zones, of course.