Method for directly controlling torque of induction motor and control device

Abstract

The invention relates to the field of control of induction motors and discloses a control method and device for directly controlling a torque of the induction motor. In the method, an electrical signal of a given torque angle and a feedback torque angle reaches a space vector modulation generator (SVM) for processing through a difference controller via an expect voltage vector generated by a voltage space vector estimator and then a switch signal of an inverter is transmitted for driving the induction motor. The device is connected with a given torque angle controller through a first input end of a difference controller; a second input end of the difference controller is connected with a first path of output end of a corner magnetic chain observer; and the difference controller is connected with the inverter through the voltage space vector estimator and the space vector modulation generator (SVM). According to the method, the torque control of the induction motor is realized and two adjustors for a magnetic chain and torque control are omitted, so that a control system has a simple structure; in addition, the design difficulty is reduced and the production cost is low.

Description

technical field [0001] The invention relates to the field of induction motor control, in particular to a control method and device for direct torque control of an induction motor using space vector modulation. Background technique [0002] At present, the induction motor is the most widely used motor in the AC drive, but due to its complex control characteristics, the high-performance control of the induction motor is one of the difficult problems to be solved in the AC drive technology. [0003] In the 1970s, German engineer F.Blashke proposed the rotor field-oriented control principle of induction motors, commonly known as the vector control principle, which made a qualitative leap in AC speed regulation technology. It basically solves the problem that the static and dynamic characteristics of the induction motor can be compared with the DC motor in theory. The vector control technology imitates the control of a DC motor and adopts the method of rotor field orientation to...

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Problems solved by technology

[0029] In order to solve the problem of complex direct torque control structure of space vector modulation induction motor and difficult design of regulator parameters, the present invention proposes a method and control device for direct torque control of induction motor, which can realize torque control of induction motor, The two regulators for flux linkage and torque control are omitted, which makes the structure of the control system simple and reduces the difficulty of parameter design for the regulator of the control system

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