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Originally Posted by Salik Syed
btw....at low speed it DOES provide MORE TORQUE!!!!! ......where is the power going hmmm???? not speed so....torque! (i think our mentor can explain it better because he knows the equations and stuff) that is just a simple way of putting it.
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at first glance, that is what i thought as well, but when you really think about it, it doesn't (at least not in the config. that i've seen). the planetary gear system is not really a CVT, because it relies on the differences in motor speed, instead of varying the gear ratios. you are assuming that a constant amount of power is going to be going into the system, and if this where true, then you really would get more torque at lower speeds, and vice versa. but since you slow one of the motors down to slow the output speed of gear system, then the amount of power going into the system is decreased.
but as matt adams wrote, you can get the same amount of torque at varying speeds, which is a major advantage. less power needed to achieve desired force=less current draw=less likely to trip a breaker