Induction machine vector control method taking account of iron loss

A vector control, induction motor technology, applied in vector control systems, motor generator control, electronic commutation motor control, etc., can solve the problems of inconsistent actual magnetic field size, no consideration of iron loss, and reduced control performance in weak magnetic high-speed areas. , to achieve the effect of enhancing the torque output capability and improving the utilization rate of the current

Inactive Publication Date: 2012-06-20
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a vector control method for induction motors considering iron loss, to solve the problem that the traditional vector control method does not consider the influence of iron loss, resulting in inaccurate magnetic field orientation in the high-speed area of ​​weak magnetic field, and the actual magnetic field size is inconsistent with the system setting. In turn, the problem of degraded control performance in the field-weakening high-speed area of ​​the system

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  • Induction machine vector control method taking account of iron loss
  • Induction machine vector control method taking account of iron loss
  • Induction machine vector control method taking account of iron loss

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Embodiment Construction

[0015] In order to solve the problems existing in the traditional vector control method, the present invention proposes a vector control method of an induction motor considering iron loss.

[0016] 1) According to the equivalent circuit of induction motor including iron loss as figure 2 As shown, the derived induction motor vector control has the following expression:

[0017] v ds = R s i ds + dψ ds dt - ω e i qs L ls - ω e i qm L m = R s i ds + dψ ...

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Abstract

The invention provides an induction machine vector control method taking account of iron loss adopts dual closed-loop control of an outer speed loop and an inner current loop, wherein the outer speed loop adopts the rotational speed PI modulating control of a motor and outputs a torque current instruction value of the inner current loop; the inner current loop adopts torque current and field current PI modulating control; in the inner current loop, the torque current and the field current are respectively compensated; and the compensated torque current and field current components are led into the current PI regulation. The induction machine vector control method takes the influence of iron loss on the field orientation and the field intensity into consideration, and improves the field orientation accuracy and control performance of a traditional induction machine vector control method, particularly the speed operating precision in a weak magnetic region and the stability in current control.

Description

technical field [0001] The invention belongs to the technical field of AC induction motors and their control, and in particular relates to a vector control method for induction motors considering iron loss. Background technique [0002] AC motor frequency conversion speed regulation methods mainly include open-loop V / f speed regulation and closed-loop speed regulation. Closed-loop speed regulation is also called vector control method, which specifically includes indirect rotor field orientation, direct rotor field orientation, and direct stator field orientation. Among them, the indirect rotor field orientation is widely used because it needs less hardware and has high control performance. [0003] The principle of indirect rotor field oriented vector control of induction motor is: establish the rotating coordinate system on the direction of the rotor magnetic field, and through this coordinate, decompose the stator current into torque current and excitation current componen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/08H02P21/22
Inventor 刘洋赵金
Owner HUAZHONG UNIV OF SCI & TECH
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