Series drivetrain with CVT output

摘要

An electric drive system for driving a machine includes first and second electric drive motors linked to sun and ring gears respectively of a planetary output stage, and a ring brake associated with the ring gear to maintain the ring gear in a locked position. The carrier drives a fixed gear series drive train. In a first regime of operation corresponding to a first range of machine speeds, a controller employs the ring brake to brake the ring gear, and actuates only the first electric drive motor at a speed sufficient to yield the desired machine speed. In a second regime, corresponding to a second range of machine speeds, the controller drives the first electric drive motor at maximum speed, releases the ring brake, and drives the second electric drive motor so as to yield the desired machine speed.

主权项

1. A series electric drive train for driving a ground engaging mechanism of a machine, the series electric drive train comprising:
a first electric drive motor having a first motor output; a second electric drive motor having a second motor output; an electrical generator for providing electrical power to the first electric drive motor and the second electric drive motor; a planetary gear set having a sun gear, a carrier, and a ring gear, the sun gear being rotationally fixed to the first motor output and the ring gear being rotationally fixed to the second motor output, the carrier providing a rotational output of the planetary gear set; a ring brake associated with the ring gear to maintain the ring gear in a locked position; and a fixed gear drive linking the rotational output of the planetary gear set to the ground engaging mechanism.