Imperforate bowl: centrifugal separators – With condition responsive means – For controlling drive of driven means within bowl
Patent
1995-10-27
1997-10-28
Cooley, Charles E.
Imperforate bowl: centrifugal separators
With condition responsive means
For controlling drive of driven means within bowl
494 84, B04B 910
Patent
active
056812566
ABSTRACT:
A screw decanter centrifuge including a cylindrical bowl rotatable in one direction, a main drive motor coupled to the bowl for rotatably driving the bowl, a screw conveyor which is disposed concentrically in the bowl and which is rotatable in the same direction as the bowl at a differential rotation speed from the bowl, and an induction type screw conveyor motor for driving the screw conveyor. The differential rotation speed is changed in response to a carrying torque of the screw conveyor. An induction type screw conveyor motor is provided for driving the screw conveyor. The induction type screw conveyor motor has a shaft connected directly to, or coupled to, a shaft of the screw conveyor, and the induction type screw conveyor motor is controlled by a speed-torque controller. The speed-torque controller includes a speed controller for calculating the differential rotation speed based on rotations indicated by an induction motor tachometer for detecting a speed of the induction type screw conveyor motor, and on rotations indicated by a bowl tachometer for detecting a speed of the bowl. The speed-torque controller further includes a vector control inverter for independently controlling an exciting current and a torque current of the induction type screw conveyor motor based on a speed command value outputted from the speed controller and an actual speed of the induction type screw conveyor motor outputted from the induction motor tachometer.
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Patnt Abstracts of Japan, vol. 18 No. 382 (E-1580), Jul. 19, 1994 & Jp-A-06 105582 (Yasakawa Electric Corp.) Apr. 15, 1994.
Patent Abstracts of Japan, vol. 18, No. 652 (E-1642) Dec. 12, 1994 & JP-A-06 253575 (Toshiba Corp.) Sep. 9, 1994.
Cooley Charles E.
NKK Corporation
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