| 摘要 |
This invention provides a double driving device which includes two motors, sharing a same common shaft or having their shafts linked together, and a control circuit. The two motors have different horse power and are used in machines, such as presses or shearing machines, which always use only one motor with less power to operate while the machines is not loaded but both of the motors while the machine is loaded so as to save the energy consumed unnecessarily during periods of no practical work. The control circuit is used to supply the intermittent operation of the motor with greater horse power.
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