Sensing motor star corner soft startup control method based on controlled silicon and device thereof

Abstract

The invention relates to a sensing motor star corner soft startup control method based on controlled silicon and a device thereof, which belong to the technical field of motors and motion control. In a sensing motor star corner startup control process, motor three-phase winding star connection soft input is first carried out so that current impact in a motor startup process is eliminated; then star connection is maintained to a stable state again and stator winding star connection is softly switched to stator winding corner connection at an appropriate switching point so that current and torque impact in the motor star corner switching is eliminated; finally corner connection operation is maintained to enter the stable state again so that the soft startup of this type of motor with limited current and limited torque is realized. The device comprises a voltage detection unit, a single-chip microcomputer control unit, a star connection soft input switch, a star corner soft switch, other elements of a main circuit, and wires. The invention has the advantages that: smooth transition is realized in the three-phase stator winding star corner soft startup process, current and torque impact is suppressed, high-order harmonic wave, noise and vibration are eliminated, and simultaneously, the easy operability of star corner soft startup is ensured.

Description

technical field [0001] The invention belongs to the field of motor and motion control, and in particular relates to a method and device for controlling a star angle soft start of an induction motor based on a thyristor. Background technique [0002] The induction motor starting methods include direct starting, star delta step-down starting, rotor circuit series resistance or series frequency sensitive rheostat starting, liquid resistance soft starting, magnetic control soft starting, thyristor AC voltage regulation soft starting and graded alternating frequency conversion soft starting, etc. Among them, the star-delta step-down starting and the AC voltage regulation soft start of the thyristor are relatively simple and effective starting methods, but the star-delta step-down starting not only reduces the starting current but also reduces the locked-rotor torque, it is only suitable for no-load or light However, the high-order harmonics caused by the thyristor are also relati...

AI Technical Summary

Problems solved by technology

[0004] The traditional star-delta starting device is realized by controlling the turn-on and shut-off of the star-connected contactor and the delta-connected contactor by a single-chip computer. The arc light of the contactor is likely to cause a short circuit at the moment of starting and when the star-delta is switched, and the safety and reliability are poor; a The solution is to replace the contactor with a thyristor, which can avoid the arc caused by the contact, but if there is no effective trigger control for the thyristor, it still cannot eliminate the transient impact current at the initial moment of starting and the moment of star-delta switching

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