Improved-overmodulation based method for improving alternating current motor torque output capacity

An AC motor and torque output technology, which is applied in the direction of AC motor control, generator control, motor generator control, etc., can solve problems such as slow current response speed, achieve fast current response speed, realize motor torque, and increase voltage The effect of utilization

Active Publication Date: 2015-09-16
TONGJI UNIV
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Problems solved by technology

However, in the control process, due to the saturation of the

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  • Improved-overmodulation based method for improving alternating current motor torque output capacity
  • Improved-overmodulation based method for improving alternating current motor torque output capacity
  • Improved-overmodulation based method for improving alternating current motor torque output capacity

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[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 an improved-overmodulation based method for improving the alternating current motor torque output capacity. The method comprises: a current PI regulator outputting voltage vectors Ud and Uq of d and q axes according to id*, iq*, id, and iq; when the alternating current motor is operating in a non-weak magnetic region, obtaining voltage vectors Ualpha and Ubeta of alpha and beta axes by performing coordinate transformation on Ud and Uq; when the alternating current motor is operating in a weak magnetic region, obtaining optimized voltage vectors Udn and Uqn of the d and q axes by applying a voltage optimization method to Ud and Uq, and obtaining Ualpha and Ubeta by performing coordinate transformation on Udn and Uqn; setting different modulation regions according to the magnitude of Ualpha and Ubeta, and outputting corrected voltage vectors Ud* and Uq* of the d and q axes according to Ualpha and Ubeta; and finally, performing spatial voltage vector modulation to generate a switch action signal for on/off control of an IGBT in an inverter. Compared with the prior art, the method of the invention has the advantages that the bus voltage is high in utilization rate, the increase of output torque is large, and the current response is quick.

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 ...

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Application Information

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IPC IPC(8): H02P21/14H02P27/06
Inventor 康劲松崔宇航王硕
Owner TONGJI UNIV
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