Asynchronous motor optimizing excitation control method based on magnetic-field saturated non-linear motor model

A motor model and asynchronous motor technology, applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve the problem of changing the saturation degree of the main magnetic circuit of the motor

Inactive Publication Date: 2003-03-19
TSINGHUA UNIV
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Problems solved by technology

But at this time, the saturation degree of the main magnetic circuit of the motor will change, and the inductance parameter is no longer a constant, so a new mathematical model and control strategy of the motor must be adopted

Method used

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  • Asynchronous motor optimizing excitation control method based on magnetic-field saturated non-linear motor model
  • Asynchronous motor optimizing excitation control method based on magnetic-field saturated non-linear motor model
  • Asynchronous motor optimizing excitation control method based on magnetic-field saturated non-linear motor model

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Embodiment Construction

[0124] please see image 3 and Figure 4 .

[0125] First, give the speed given value ω according to the required motor speed * , compare the given value with the measured speed ω r Subtract the speed error Δω, and then substitute the speed error into the speed PI regulator to calculate the torque reference value Te * . At the same time according to the actual speed and torque reference value Te * , from the already calculated excitation optimization curve look-up table to get the required optimal excitation current reference value i * Ms , and at the same time substitute the given excitation current into the torque current calculation module and calculate the given torque current i from formula (3)(4) * Ts . The required slip angular frequency ω can be calculated by the formula (5) through the given excitation and torque current s , plus the actual measured motor speed ω r Obtain the angular frequency of the rotor current. The angular frequency of the rotor curren...

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Abstract

The present invention belongs to the field of asynchronous motor exciting speed-regulating technology and features the exciting speed-regulating method of optimizing stator-exciting current to regulate rotor magnetic linkage. It MT coordinate system, the finite element analysis to asynchronous motor magnetic field is performed to obtain the effect of saturated motor magnetic field on motor parameters and the stator and rotor magnetic linkage via solving non-linear equation. The magnetic linkage table is optimized to obtain optimized exciting table and maximum torque vs rotation speed table. By means of PI control method to obtain optimized exciting current and reference value of torque current, comparison to practical exciting current and torque current and PI regulation and voltage decoupling, final stator voltage in MT coordinate system is obtained for the control of the inverter.

Description

technical field [0001] The optimal excitation method for an asynchronous motor based on a magnetic field saturation nonlinear motor model belongs to the technical field of excitation control of asynchronous motor speed Background technique [0002] With the development of power electronics technology and computer technology, AC electric drive is gradually replacing DC drive to become the main trend of electric drive. Among AC motors, asynchronous motors are the most widely used. Its advantages are low cost, simple structure, high reliability, convenient maintenance, small moment of inertia, high efficiency, and large rated capacity. However, AC motors, especially asynchronous motors, are multivariable and strongly coupled systems. The control system is very complicated and it is difficult to achieve high-performance speed regulation. Various testing instruments are often used to participate in the control, which increases the complexity and cost of the system and reduces th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00
Inventor 朱东起姜新建宇文博许德伟
Owner TSINGHUA UNIV
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