Biphase orthogonal vector control type magnetic stirrer inverter

Abstract

The invention discloses an inverter for two-phase orthogonal electromagnetic blender, adopting a six-leg structure and an orthogonal vector control method to complete the decoupling control for the current and frequency of the two-phase electromagnetic blender so as to make the phase difference of two-phase low-frequency output currents be 90 deg., the third phase is connected with the midpoint of the two-phase electromagnetic blender, and the AC of the third phase is radical sign 2 times as great as those of the other two phases. The method adopts a current- frequency double closed-loop control. The current sensor collects two-phase current signals and PI regulation sections control the frequency of the output pulse by orthogonal transform, PWM drive, etc., thus controlling the amplitudes and frequencies of the two-phase orthogonal low-frequency voltages that are outputted by the inverter, and thus the invention implement the vector control of the magnetic force of blending of the electromagnetic blender. The invention improves the reliability of the electromagnetic blending system and reduces reactive compensating equipment and filtering equipment, saving the space and reducing the cost of the electromagnetic blender.

Description

technical field [0001] The utility model relates to a two-phase orthogonal electromagnetic stirrer inverter power supply, which has the characteristic of a constant current source, and is used as a power supply for an electromagnetic stirrer with two-phase windings in steel or nonferrous metal smelting or continuous casting processes. Background technique [0002] In the smelting process of steel and non-ferrous metals, the electromagnetic stirrer is a key device to improve the product quality of the continuous casting system. Due to its strong electromagnetic penetration, the two-phase electromagnetic stirrer is often used in special stirring such as furnace bottom stirring Occasionally, the low-frequency power supply of the electromagnetic stirrer in the past used the thyristor AC-AC frequency conversion method, which has a complex structure, a large footprint, and a low power factor. At the same time, the harmonic content is very large, causing great pollution to the powe...

AI Technical Summary

Problems solved by technology

However, since the solution can only use a three-phase electromagnetic stirrer, this method is powerless for occasions that require a two-phase electromagnetic stirrer with strong electromagnetic penetration.

Images