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A Current Control Method for Improving Output Torque in Overmodulation Region of Permanent Magnet Synchronous Motor

A permanent magnet synchronous motor, current control technology, applied in motor generator control, electronic commutation motor control, control system, etc. Torque ripple, the effect of increasing open-loop gain

Active Publication Date: 2016-07-06
TIANJIN UNIV
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  • Abstract
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  • Claims
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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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  • A Current Control Method for Improving Output Torque in Overmodulation Region of Permanent Magnet Synchronous Motor
  • A Current Control Method for Improving Output Torque in Overmodulation Region of Permanent Magnet Synchronous Motor
  • A Current Control Method for Improving Output Torque in Overmodulation Region of Permanent Magnet Synchronous Motor

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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 power converter control for driving motors, and relates to a current control method for improving the output torque in the overmodulation area of ​​a permanent magnet synchronous motor, including: a PI controller is used for the speed loop; a resonance-based control method is used for the dq axis current loop Current controller, and the parameters of the current controller are adjusted; the field weakening control link adopts the PI controller, and its output passes through the limiting link as the d-axis current given value; according to the given voltage vector dq axis component output by the current controller , Calculate the duty ratio through the SVPWM over-modulation link, and generate a PWM signal to drive the motor. The invention proposes a method for suppressing current harmonics caused by overmodulation of field weakening, increases the open-loop gain of the current loop, and can effectively suppress current, harmonics and torque fluctuations caused by overmodulation.

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] 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 CNC machine tools, aerospace and electric vehicles and other fields. 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 s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/22H02P21/05
Inventor 夏长亮王贺超阎彦史婷娜
Owner TIANJIN UNIV
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