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Whats variable speed drives?

Author : From Internet Date : 2013-11-16 14:41:40
variable speed drives
As shown in the drawing above, the input speed goes through the high speed mechanism, and the speed reduction takes
place with the contact among the inner sun, planet discs, and outer rings. This reduced speed (via viscous traction) then drives
the slow speed mechanism and outputs the low speed. The speed variation is achieved by altering the relative position among
the inner sun, planet discs, and outer rings. In another word, since the location of the inner sun and outer rings remains
unchanged relative to the frame of the variator body, the speed variation is achieved by altering the radial position of the planets
discs relative to the shaft center.

The centrifugal force acts on the planet discs as they rotate around the inner sun. Since you can adjust the gap between two
outer rings by turning the control wheel, the conical shaped planet discs are free to shift toward or away from the inner sun. As
the planet discs shift radially, the contact radius between planet discs and inner sun as well as the contact radius between planet
discs and outer rings vary, therefore contributing to speed variation.

Please refer to the illustration below. When planet discs are closest to inner sun (i.e. farthest from outer rings), the reduction
ratio is minimum (1.5:1), and the output speed is maximum. On the other hand, when the planet discs are closest to outer rings
(i.e. farthest from inner sun), the reduction ratio is maximum (9:1), and the output speed is minimum.

For more information,please refer to speed variator.
Speed Variator

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