Pressure and speed regulating system for semi-digital AC stator

Abstract

The invention relates to a semi-digitalization direct current stator variable voltage speed control system, which comprises a main controller, a speed setting device, a power module, a current transformation device, a motor, a reel and a processor which is used to adjust parameters, wherein the process is used to adjust the parameters, receives a plurality of input signals which pass through analog to digital conversion, and outputs the signals after comparison processing adjustment, the system also comprises a D/A conversion module which is connected with an output end of the process, is used to convert a part of digital signals which are output by the processer into analog control signals, and outputs the analog control signals to the main controller, wherein the main controller controls the motor to operate according to the analog control signals. The system of the invention realizes parameter arrangement and adjustment through increasing the processer and has the advantages of high adjusting precision, stable working performance and strong anti-interference ability. The system only needs to input parameters of an original device into a new device in in-situ device replacement. The maintenance quantity is reduced and the safe production has more reliable guarantee. The electronic over-speed and hook gliding preventing protection is increased, and the system safety is increased.

Description

technical field [0001] The invention belongs to the technical field of voltage regulation and speed regulation of AC stators of cranes. Background technique [0002] At present, there are mainly three speed regulation methods for AC asynchronous motors used in cranes: changing the pole logarithm p speed regulation, changing the slip rate S speed regulation and changing the frequency f 1 speed regulation. Changing the slip rate S speed regulation is mainly divided into two types: one is the series resistance of the rotor circuit, and the other is the stator voltage regulation. Frequency conversion speed regulation mainly changes the frequency of the stator voltage of the motor. At present, the most practical application is stator voltage regulation and speed regulation. Its control mode is divided into analog control mode and digital control mode. The existing stator voltage regulation and speed regulation is usually controlled by analog quantity, and each parameter is adj...

AI Technical Summary

Problems solved by technology

The existing stator voltage regulation and speed regulation is usually controlled by analog quantity, and each parameter is adjusted by a potentiometer, which is inconvenient to adjust and has large errors. When the crane is used for a long time under the condition of large vibration, the parameters of the potentiometer are easy to change.

And the display part adopts light-emitting diodes, which has the disadvantages that the display is not intuitive, and it is not convenient to quickly find and deal with faults on site

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