Drive control system of permanent magnet synchronous motor of numerically-controlled machine tool

A permanent magnet synchronous motor, drive control technology, applied in the control system, vector control system, motor generator control, etc. Major and other issues

Active Publication Date: 2020-12-08
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The permanent magnet synchronous motor meets the requirements of CNC machine tools with good motor drive speed, large starting torque, strong overload capacity, and wide range of speed regulation. The control method based on load torque compensation can reduce the impact of load disturbance, but in the When the torque changes frequently or the internal parameters of the control system are perturbed, it will lead to an increase in the observation deviation of the load torque, which will affect the performance indicators such as the steady state, dynamic and speed regulation range of the speed control of the permanent magnet synchronous motor.

Method used

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  • Drive control system of permanent magnet synchronous motor of numerically-controlled machine tool
  • Drive control system of permanent magnet synchronous motor of numerically-controlled machine tool
  • Drive control system of permanent magnet synchronous motor of numerically-controlled machine tool

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] In formula (7), is the observed value of the load torque, is the rotor angular velocity estimate, g is the feedback gain of the load torque observer, k g is the sliding mode gain of the load torque observer embodiment 1, and the load torque observer embodiment 1 is a sliding mode observer. Compared with the load torque, the motor friction has a small proportion, so that B=0, ignoring the influence of friction, then the load torque observer embodiment 1 of formula (7) becomes:

[0072]

[0073] According to (6) and formula (8) when B=0, obtain the error equation of load torque observer embodiment 1 as:

[0074]

[0075] In formula (9), is the rotor angular velocity estimation error, Observing the error for the load torque, and defining the sliding surface of the observer as According to the sliding mode accessibility condition, the stability condition of the observer system in formula (8) is k g ≤-|e 2 / J|, and g<0.

Embodiment 2

[0078] Compared with the load torque, the motor friction has a small proportion, so that B=0, ignoring the influence of friction, then the load torque observer embodiment 2 of formula (10) becomes:

[0079]

[0080] In formula (10), (11), is the observed value of the load torque, is the rotor angular velocity estimate, g is the feedback gain of the load torque observer, k W is the proportional gain of the load torque observer embodiment 2, and the load torque observer embodiment 2 is a state observer. According to the formula (6) and formula (11) when B=0, the error equation of the load torque observer embodiment 2 is obtained as:

[0081]

[0082] In formula (12), is the rotor angular velocity estimation error, is the load torque observation error. The state observer of formula (11) is an autonomous linear system, at k W <0, and g<0, the observer is asymptotically stable. The formula (7) of the load torque observer embodiment 1 and the formula (10) of the l...

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Abstract

The invention discloses a drive control system of a permanent magnet synchronous motor of a numerically-controlled machine tool. Load torque observation adopts an algorithm that feedback gain is automatically adjusted according to the variable quantity of a load torque given value and the variable quantity of a load torque observed value. When the system speed is changed, or parameters are changed, the load is disturbed, and the given value of the load torque or/and the observed value of the load torque is/are changed, the observation error of the load torque is quickly reduced, the observed value of the load torque is fed forward and compensated to a current regulator, therefore the control precision of the permanent magnet synchronous motor is improved.

Description

technical field [0001] The present invention relates to the technical field of permanent magnet synchronous motors, and more specifically, relates to a drive control system for permanent magnet synchronous motors of numerical control machine tools. Background technique [0002] Permanent magnet synchronous motors have the advantages of high efficiency, large torque, and good speed performance, and are widely used in manufacturing, electric vehicles, industrial production and other fields. The permanent magnet synchronous motor meets the requirements of CNC machine tools with good motor drive speed, large starting torque, strong overload capacity, and wide range of speed regulation. The control method based on load torque compensation can reduce the impact of load disturbance, but in the When the torque changes frequently or the internal parameters of the control system are perturbed, the deviation of the load torque observation will increase, which will affect the performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/13H02P21/20H02P21/05H02P25/022
CPCH02P21/0003H02P21/13H02P21/20H02P25/022H02P2207/05H02P27/08H02P21/0007G06N3/006H02P2205/01H02P2205/07Y02T10/72
Inventor 周建华凌云王兵黄云章刘颖慧聂辉汤彩珍
Owner HUNAN UNIV OF TECH
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