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The Realization Method of Vector Control of Three-phase Asynchronous Motor

A vector control and three-phase asynchronous technology, which is applied in the field of vector control of three-phase asynchronous motors, can solve the problem that the rotor flux model is unreasonable, the physical connection of variables under the two-axis cannot be fully utilized, and the theoretical effect of vector control technology is difficult to obtain and other problems, to achieve the effect of avoiding overload and overheating operation, avoiding high-frequency noise amplification, and large output capacity

Active Publication Date: 2022-07-19
BOHAI UNIV
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Problems solved by technology

[0004] However, vector control technology is difficult to achieve theoretical results in practical applications. The reasons include: 1) The model of the given rotor flux linkage is unreasonable; 2) The single-loop PID limit cannot make full use of the physical connection between variables under the dual-axis

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Embodiment Construction

[0111] Below in conjunction with accompanying drawing and embodiment, the utility model is described in detail:

[0112] The realization method of three-phase asynchronous motor vector control, the steps are as follows:

[0113] 1. Mathematical model of three-phase asynchronous motor

[0114] In the rotating coordinate system, with The state equation of the three-phase squirrel-cage asynchronous motor with state variables:

[0115]

[0116] In the formula, i sd , i sq is the components of the d-axis and q-axis of the stator current space vector in the rotating dq coordinate system; u sd , u sq is the component of the d-axis and q-axis of the electron voltage space vector in the rotating dq coordinate system; ψ rd , ψ rq is the component of the stator flux linkage vector in the rotating dq coordinate system of the d-axis and the q-axis; J is the moment of inertia; B is the viscous friction coefficient; T l is the load torque; p is the differential operator; σ is the...

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Abstract

A method for realizing vector control of a three-phase asynchronous motor, the steps of which are as follows: using the mathematical model of the three-phase asynchronous motor, the state equation of the three-phase squirrel-cage asynchronous motor as a state variable in a rotating coordinate system; constructing a three-phase asynchronous motor vector Control system, rotor flux linkage and stator angular velocity calculation module, rotor flux linkage voltage model, rotor flux linkage discretization calculation model, given rotor flux linkage model, PID control with dual-axis cooperative limiting is divided into outer loop PID Compared with the inner loop PID, the beneficial effects are: effectively avoid the problem that the rotor flux linkage of the traditional model is too large due to slip, further reduce the core loss, improve the operating efficiency of the motor, and effectively avoid the high-frequency noise amplification of differential operations. It ensures that the system has the maximum output capacity during start-up or heavy-load operation, and at the same time ensures that the system will not run overloaded for a long time, avoid motor overload and overheat operation, and avoid motor overvoltage operation.

Description

technical field [0001] The invention relates to a method for realizing vector control of a three-phase asynchronous motor, in particular to a method for realizing vector control of a three-phase asynchronous motor based on rotor flux linkage orientation. Background technique [0002] In most of the 20th century, the excitation circuit and armature circuit of the DC motor were independent and had superior speed regulation performance. High-performance adjustable-speed drives generally used DC motors; Strong coupling, multi-variable and non-linear characteristics, speed regulation is difficult, and it has been limited to the field of constant speed transmission for a long time. This division of labor according to speed regulation has been recognized by people at that time. It was not until the 1970s and 1980s that with the development of power electronics technology, computer technology, and variable frequency speed regulation technology, a new era of AC electric drives was op...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/14
CPCH02P21/0003
Inventor 巫庆辉侯元祥常晓恒尹作友张志强刘闯
Owner BOHAI UNIV
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