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Current control method for improving output torque of permanent magnet synchronous motor overmodulation area

A permanent magnet synchronous motor and current control technology, which is applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve the problem of high harmonic content in the system, and achieve suppression of current and harmonics and rotation Moment ripple, the effect of increasing the open-loop gain

Active Publication Date: 2014-02-19
TIANJIN UNIV
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AI Technical Summary

Problems solved by technology

However, the main problem of this type of method is that the high-order harmonic content of the system is relatively large.

Method used

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  • Current control method for improving output torque of permanent magnet synchronous motor overmodulation area
  • Current control method for improving output torque of permanent magnet synchronous motor overmodulation area
  • Current control method for improving output torque of permanent magnet synchronous motor overmodulation area

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Embodiment approach

[0031] The invention is suitable for a permanent magnet synchronous motor speed regulating system fed by a two-level inverter. The present invention will be described in further detail below in conjunction with specific examples and accompanying drawings. image 3 For the implementation flow chart of the present invention, the implementation method of the present invention comprises the following steps:

[0032] (1) Detect the mechanical angular position of the motor rotor and convert it to the electrical angle θ of the rotor, and calculate the motor speed ω by using the MT method.

[0033] (2) The speed loop adopts PI controller, and its input is the speed given ω * The difference from the sampling speed ω. The output is the q-axis current given value i q * .

[0034] (3) Detect the DC bus voltage u of the motor control system dc . Detect the motor stator three-phase current i a i b i c , to calculate the stator current two-phase rotating coordinate system component...

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Abstract

The invention belongs to the technical field of controlling of power converters of driving motors, and relates to a current control method for improving the output torque of a permanent magnet synchronous motor overmodulation area. The method includes the steps that a PI controller is adopted to a rotating speed loop; a current controller based on resonance control is used for a dq shaft electric current loop, and parameter setting is carried out on the current controller; the PI controller is adopted in a field-weakening control link, and output of the PI controller serves as a d shaft current set value through an amplitude limiting link; according to set voltage vector dq shaft components output by the current controller, the duty ratio is calculated through an SVPWM overmodulation link, and a PWM signal driving motor is produced. The method suppresses current harmonics caused by flux weakening overmodulation, open-loop gains of the current loop are increased, and current, harmonic and torque fluctuation caused by overmodulation can be effectively suppressed.

Description

Technical field [0001] The invention belongs to the technical field of power converter control for driving motors, and in particular relates to a method for improving the performance of a permanent magnet synchronous motor speed regulation system using resonance control. Background technique [0002] The permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) has the advantages of simple structure, reliable operation, high power density, etc., and is widely used in the fields of CNC machine tools, aerospace and electric vehicles. With the acceleration of industrial modernization, the requirements for PMSM control systems are no longer limited to traditional application environments such as rated operating conditions, but are gradually extended to the constant power operation area above the base speed. At present, the overmodulation strategy and field weakening control are effective methods to achieve the above requirements. [0003] The overmodulation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/05
Inventor 夏长亮王贺超阎彦史婷娜
Owner TIANJIN UNIV
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