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A method for improving torque output capability of AC motors based on improved overmodulation

An AC motor, torque output technology, applied in the direction of AC motor control, generator control, motor generator control, etc., can solve the problem of slow current response speed, achieve fast current response speed, expand operating area, and realize motor rotation. moment effect

Active Publication Date: 2017-08-15
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the control process, due to the saturation of the current regulator, the response speed of the current is slow

Method used

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  • A method for improving torque output capability of AC motors based on improved overmodulation
  • A method for improving torque output capability of AC motors based on improved overmodulation
  • A method for improving torque output capability of AC motors based on improved overmodulation

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Embodiment Construction

[0047] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0048] figure 1 It is a vector control system diagram of an AC motor, in which the core algorithm of the permanent magnet synchronous motor control system is vector control, and the three-phase current output by the inverter drives the rotation of the motor. The invention improves the torque output capacity of the AC motor based on the improved over-modulation The best method is to add voltage optimization, over-modulation and six-beat running state algorithm on the basis of vector control to realize the improvement of output torque in the field weakening area. Specifically include: ...

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Abstract

The invention relates to a method for improving the torque output capability of an AC motor based on improved overmodulation, comprising: a current PI regulator outputs dq-axis voltage vectors Ud and Uq according to id*, iq*, id, and iq; In the field-weakening area, Ud and Uq obtain the αβ-axis voltage vectors Uα and Uβ after coordinate transformation. When the AC motor runs in the field-weakening area, Ud and Uq obtain the dq-axis optimized voltage vectors Udn and Uqn through the voltage optimization method. Udn and Uqn are obtained by After coordinate transformation, Uα and Uβ are obtained; according to the size of Uα and Uβ, it is divided into different modulation areas, and the corrected dq axis voltage vectors Ud* and Uq* are output by Uα and Uβ; finally, space voltage vector modulation is performed to generate switching action signals to control On and off of the IGBT in the inverter. Compared with the prior art, the invention has the advantages of high bus voltage utilization rate, large output torque boost, fast current response speed and the like.

Description

technical field [0001] The invention relates to the vector control technology of an AC motor, in particular to a method for improving the torque output capability of an AC motor based on improved overmodulation. Background technique [0002] At present, in the fields of electric vehicles and rail transit, AC motors face the problems of small torque output and low DC side voltage utilization in the field weakening area due to the limitations of control methods. At present, there are two main methods to solve this kind of problem: one is to optimize the design of the motor structure; the other is to study the field weakening control strategy from the control means. The first type of method is to increase the torque by changing the structure of the motor. This method requires the use of more advanced processes and technologies, and the cost will increase a lot. The second type of method is to realize the coordinated distribution of the stator current under the d and q axes of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/24H02P27/06
Inventor 康劲松崔宇航王硕
Owner TONGJI UNIV
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