Cage Asynchronous Motor Speed ​​Control System Based on Magneto-rheological Fluid

Abstract

The invention provides a cage type asynchronous motor speed regulating system based on magnetorheological fluid. The cage type asynchronous motor speed regulating system comprises a cage type winding and a flow regulating control circuit. The cage type winding is composed of the magnetorheological fluid, an insulating tube, a magnet exciting coil and an end ring. The flow regulating control circuit is composed of a wire, a collecting ring, an electric brush and a constant flow source circuit capable of outputting adjustable currents. When a cage type asynchronous motor works, the magnet exciting coil on the cage type winding can generate corresponding strong or weak magnetic fields by changing the size of the current output by the constant flow source circuit, the resistance of the magnetorheological fluid is changed under the effect of the magnetic fields, induced current passing the cage type rotor winding changes along with the change of the resistance, so that the rotation speed of the a cage type rotor is changed, and finally the output rotation speed of the cage type asynchronous motor is changed. The cage type asynchronous motor speed regulating system is designed by utilizing the characteristic that the resistance of the magnetorheological fluid changes under the magnetic field environment and has the advantages of being wide in speed regulating range, quick in speed regulating response, capable of achieving stepless speed regulation and the like.

Description

technical field [0001] The patent of the invention relates to a motor speed regulation system, especially for the speed regulation of cage-type asynchronous motors. Background technique [0002] At present, the basic ways of asynchronous motor speed regulation are: frequency conversion speed regulation, pole-changing speed regulation and variable slip speed regulation. Among them, the variable slip speed regulation schemes include: asynchronous motor stator voltage regulation, electromagnetic slip clutch speed regulation and winding type asynchronous motor rotor loop series resistor speed regulation, etc. The speed regulation technology suitable for cage-type asynchronous motors is mainly frequency conversion speed regulation and variable speed regulation. Frequency conversion speed regulation technology can realize stepless speed regulation, but a frequency converter must be used to change the power frequency, and variable speed regulation belongs to pole speed regulation. ...

AI Technical Summary

Problems solved by technology

For the cage-type asynchronous motor, if the resistance of the rotor circuit can be changed, the purpose of speed regulation can also be achieved, and the speed regulation range is wide and the speed regulation is smooth. However, due to the limitation of the rotor structure of the traditional cage-type asynchronous motor, the current technology Scheme not applied

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