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A rotor frequency conversion redundancy speed adjusting device

A speed regulating device and rotor technology, applied in the direction of electrical components, control systems, AC motor control, etc., can solve the problems of high liquid water temperature, production line impact, power consumption, etc., and achieve less equipment, digitalization, energy saving, environmental protection, and use Simple and convenient effect

Active Publication Date: 2013-10-23
GUANGZHOU LONGZIAN ELECTRIC
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The use of liquid resistance speed controllers in fans, pumps and other quadratic rate loads has a certain energy-saving effect, but a considerable part of the electric energy is still consumed in the liquid resistance. As the running time continues, the temperature of the liquid water is getting higher and higher.
[0005] In the rotor inverter, when a fault occurs and the motor enters full-speed operation, the production line that is already in the best process state will be greatly affected. The operator must respond in time and take appropriate measures to deal with it, which will bring great impact to the operation. Trouble

Method used

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  • A rotor frequency conversion redundancy speed adjusting device
  • A rotor frequency conversion redundancy speed adjusting device
  • A rotor frequency conversion redundancy speed adjusting device

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Embodiment Construction

[0016] Such as figure 1 As shown, the liquid resistance is adjusted by adding appropriate electrolytic powder to pure water. The more electrolytic powder added, the smaller the resistance. When the motor (1) is started, the electrode plate is located at the same height as the upper limit switch. At this time, the resistance of the liquid resistance externally connected to the rotor winding is the largest, the starting torque is large, the starting current is small, and the motor (1) starts smoothly. This type of product is improved on the basis of the traditional liquid resistance starter (2), and already has the function of speed regulation. The speed regulation control system consists of hardware and software. The hardware includes the core components PLC, tachometer, electrode plate travel motor, control electrical appliances, etc. Among them, the PLC is mainly used for logic control, speed value acquisition, adjustment calculation, etc., and is the core of the speed contr...

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Abstract

The invention discloses a rotor frequency conversion redundancy speed adjusting device. On the basis of the principles of a liquid resistor speed regulator and a rotor frequency converter, the liquid resistor speed regulator and the rotor frequency converter are improved and then are combined. The liquid resistor speed regulator is adjusted in order to achieve coordinate cooperative operation of the two speed adjusting devices. A PLC, an analog quantity I / O, and a revolution meter in the liquid resistor speed regulator are removed and then the liquid resistor speed regulator is controlled by an ordinary relay-contactor. The speed control power of the liquid resistor speed regulator is acquired by the rotor frequency converter so that a purpose of reliable redundancy speed adjustment is achieved. The rotor frequency conversion redundancy speed adjusting device has a wide application range and can be used for a common wire-wound asynchronous motor, an internal-feedback wire-wound asynchronous motor, a squirrel-cage brushless double-feed motor, a squirrel-cage feedback motor, and a novel brushless double-feed motor. The rotor frequency conversion redundancy speed adjusting device has characteristics of simple circuit structure, easy and convenient use, achieved remote monitoring and managing, high digitization degree, and energy conservation and environmental friendliness.

Description

technical field [0001] The invention relates to the field of rotor frequency converter speed regulation, in particular to a rotor frequency conversion redundant speed regulation device of a winding asynchronous motor. Background technique [0002] For the speed regulation of high voltage (3KV, 6KV, 10KV) and large capacity (greater than 200KW) winding rotor asynchronous motors, the current popular speed regulation methods are divided into two categories: stator side speed regulation and rotor side speed regulation. The speed regulation on the stator side mainly includes AC-AC frequency conversion speed regulation and AC-DC-AC frequency conversion speed regulation. In this mode, the three-phase winding of the rotor needs to be short-circuited. [0003] At present, there are two types of rotor-side speed regulation products that are widely used in the field: liquid resistance speed governor and rotor frequency converter. [0004] The use of liquid resistance speed controllers...

Claims

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Application Information

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IPC IPC(8): H02P27/04H02P25/24
Inventor 施甘东杜兴才
Owner GUANGZHOU LONGZIAN ELECTRIC
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