Intelligent controller for three-phase motor

Abstract

The invention discloses an intelligent controller for a three-phase motor. The intelligent controller for the three-phase motor comprises a magnetic latching relay K1, a positive-rotation magnetic latching relay K2, a positive-rotation magnetic latching relay K3, a negative-rotation magnetic latching relay K4, a negative-rotation magnetic latching relay K5 and a microprocessor, wherein the magnetic latching relay K1 is connected with a commercial power U phase and a motor U phase; the positive-rotation magnetic latching relay K2 is connected with a commercial power V phase and a motor V phase; the positive-rotation magnetic latching relay K3 is connected with a commercial power W phase and a motor W phase; the negative-rotation magnetic latching relay K4 is connected with the commercial power W phase and the motor V phase; the negative-rotation magnetic latching relay K5 is connected with the commercial power V phase and the motor W phase; the microprocessor makes the relays switched on through closed driving circuits and makes the relays switched off through open driving circuits; a V-phase channel state feedback circuit is connected with an interlocking circuit of the K2 and theK4; the interlocking circuit is connected with the closed driving circuit of the K2 and the K4; a W-phase channel state feedback circuit is connected with an interlocking circuit of the K3 and the K5; and the interlocking circuit is connected with the closed driving circuit of the K3 and the K5. The intelligent controller for the three-phase motor has the advantages of capacity of carrying a larger load, strong anti-interference capacity and stable and reliable operation.

Description

technical field [0001] The invention relates to an intelligent three-phase motor controller. Background technique [0002] In modern society, three-phase AC motors are widely used in various fields of production and life. Motor control is a mature and widely used technology. How to control the on and off of the motor, as well as the forward and reverse rotation is already a very old topic. The current research is more inclined to how to reasonably control the motor to reduce the accident rate and prolong its service life and so on. At present, the mainstream motor forward and reverse controllers generally use solid-state relays to realize the forward and reverse of the motor by mechanical action and pure manual operation. [0003] A solid state relay (SSR) is a relay with no mechanical movement and no moving parts. SSR is a non-contact switching element composed entirely of solid-state electronic components. It uses the point, magnetic and optical characteristics of elec...

AI Technical Summary

Problems solved by technology

However, the tube voltage drop is large after it is turned on, and there is still a leakage current of several microamps or even milliamperes after the semiconductor device is turned off, and the temperature characteristics of electronic components and the anti-interference ability of electronic circuits are poor.

Therefore, solid-state relay modules are mostly used in occasions with small loads and small electromagnetic interference, but are not suitable for large-load motor control, and have poor adaptability to occasions with strong electromagnetic interference.

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