A method for controlling the maximum torque-to-current ratio of an induction motor

Abstract

The invention discloses a method for controlling the maximum torque current ratio of an induction motor, which belongs to the technical field of induction motor control. The control method combines PI and predictive function control under the condition that the induction motor is in light-load operation to obtain a new control method that can be applied to a multi-input multi-output system, and the output control of the predictive function controller The voltage is used as the input signal of the inverter circuit to change the output voltage of the inverter, thereby controlling the motor speed and realizing the tracking control of the induction motor speed. The control precision is high, the tracking speed is fast, the steady-state error is small, and the anti-interference ability is strong, which can not only ensure the good stability and dynamic performance of the induction motor, but also improve the operating efficiency of the motor when it is dynamic.

Description

technical field [0001] The invention relates to a method for controlling the maximum torque-current ratio of an induction motor, in particular to a method for controlling the maximum torque-current ratio of an induction motor based on multivariable PI predictive function control, and belongs to the technical field of induction motor control. Background technique [0002] The induction motor transmission system has become the most widely used transmission system due to its ruggedness, low price, and high reliability. The electric energy consumed by the three-phase cage induction motor accounts for more than 90% of the electric energy consumed by all industrial motors. Typically, induction motors are engineered to achieve maximum efficiency at around 75% of rated load, and close to maximum efficiency at rated load. However, when running in a low load area, especially when the load rate is lower than 50%, the efficiency of the motor will drop rapidly. Therefore, induction mot...

AI Technical Summary

Problems solved by technology

The motor system is a typical control system with multiple variables, strong coupling, and complex dynamic process. It is also difficult to establish an accurate mathematical model, but at the same time it is a fast system. The traditional predictive control has a large amount of online calculation, poor real-time performance, and may be accompanied by unknown Control law, not suitable for speed control of induction motors

However, there are no literatures and reports on combining and extending PI and predictive function control to MIMO systems and applying it to induction motor control.

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