| 摘要 |
The present invention provides an adjustable drive vibrating device, such as a vibrating conveyor, vibrating feeder and the like. Basically, the device comprises: a container, means mounting the container such that it can vibrate as a free mass, drive means including an electric motor for vibrating the container at a prescribed frequency and stroke, and control means for selectively adjusting voltage applied to the motor and thereby selectively altering the frequency and stroke at which the container is vibrated by the drive means. However, in particular accordance with the present invention, the drive means motor comprises a three-phase A.C. squirrel cage electric motor, and the control means adjust the voltage applied to only two of the three phases of the motor, while a substantially constant voltage is maintained on the third phase of the motor.
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