| 摘要 |
A turning gear arrangement for a turbomachine such as a large steam driven turbine-generator is disclosed. The turning gear arrangement includes a prime mover system which generates high starting torque for rolling the rotor of the turbine-generator over a narrow low speed range and which provides a lower, substantially constant torque over a wider high speed range. A preferred embodiment of the invention includes a drive gear mounted on the turbine motor shaft; a fixed gearing system through which drive torque is transmitted to the rotor shaft; and a prime mover having an electrical motor to provide high initial torque to start and maintain rotation of the turbine over a low speed range, and a hydraulic turbine providing lower, substantially constant torque to maintain rotation over a higher speed range.
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