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Starting method of 3-phase induction motor and decanter type centrifugal separator

A technology of induction motor and centrifugal separation, which is applied to the starter, motor generator/starter, centrifuge and other directions of a single multi-phase induction motor, which can solve the problems of malfunction, cost increase, and mixing with electrical equipment, etc., and achieve reduction The effect of increasing magnitude

Inactive Publication Date: 2018-01-30
TOMOE ENGINEERING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The drum is a large machine with a large moment of inertia. Therefore, the size of the three-phase induction motor and the inverter for starting become larger, resulting in an increase in cost.
In addition, noise may be mixed in the current of the power supply that supplies power to the inverter, which may cause malfunction of electrical equipment driven by the power supply.

Method used

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  • Starting method of 3-phase induction motor and decanter type centrifugal separator
  • Starting method of 3-phase induction motor and decanter type centrifugal separator
  • Starting method of 3-phase induction motor and decanter type centrifugal separator

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Embodiment Construction

[0039] figure 1 It is a schematic cross-sectional view of a horizontal decanter centrifuge (corresponding to a decanter centrifugal separation device). However, the invention of the present application can also be applied to a vertical decanter centrifuge. The decanter centrifuge 100 includes: a housing 10; a drum 20 accommodated inside the housing 10; a screw conveyor 30 disposed inside the drum 20; a supply nozzle 40 used for feeding solids containing the liquid to be treated; and a driving device 50 which rotates the drum 20 .

[0040] In the lower portion of the housing 10 , a heavy fraction outlet 11 is formed on one end side of the drum 20 in the direction of the rotation axis, and a light fraction outlet 12 is formed on the other end side. Power generated by the driving device 50 is transmitted to the pulley 52 via the rotating belt 51 , and the rotating drum 20 is rotated by the rotation of the pulley 52 . In addition, power is transmitted to the screw conveyor 30 v...

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Abstract

The invention provides a starting method of a 3-phase induction motor. Compared with a basic starting method, the starting method is advantaged in that the temperature increase amplitude of the 3-phase induction motor during the starting process of a decanter type centrifuge can be reduced. By means of the starting method of the 3-phase induction motor, a revolving drum of a decanter type centrifugal separator carrying out centrifugal separation on an object to be processed rotates faster from a stop state to a target speed. The starting method is characterized in that by employing a star connection mode, a power supply is electrically connected with the 3-phase induction motor, a thyristor is employed to shear waveform of voltage supplied from the power supply to the 3-phase induction motor while the 3-phase induction motor is started, furthermore, when the current effective value of the 3-phase induction motor is reduced in the starting process, a process for increasing the conduction angle of the thyristor is carried out.

Description

technical field [0001] The present invention relates to a method for starting a three-phase induction motor that accelerates the rotation of a bowl of a decanter that centrifuges a processed product from a stopped state to a target speed. Background technique [0002] A decanter centrifuge is known as a centrifugal separation device for solid-liquid separation. This decanter centrifuge is used for dehydration treatment of various synthetic resins such as polyvinyl chloride resin (PVC), polyethylene, polystyrene, and polypropylene. Generally, such a decanter centrifuge has: a drum that applies a centrifugal force to the processed material to separate the solid from the liquid; a screw conveyor that transports the solid material after the solid-liquid separation toward the discharge port; a three-phase induction motor that It is used to drive the drum to rotate it; and an inverter device for inverter control of the three-phase induction motor. [0003] The drum is a large ma...

Claims

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Application Information

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IPC IPC(8): H02P1/32B04B9/04
CPCB04B9/10
Inventor 冈安祐次
Owner TOMOE ENGINEERING CO LTD
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