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Permanent magnet synchronous motor maximum torque current ratio control method based on parameter identification

A technology of maximum torque current, permanent magnet synchronous motor, applied in the direction of single motor speed/torque control, current controller, motor control, etc., can solve the problem of difficult online calculation of MTPA operating point, save debugging time, improve The effect of stability

Active Publication Date: 2021-06-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a method for controlling the maximum torque-to-current ratio of a permanent magnet synchronous motor based on parameter identification. By adopting the control condition of a novel MTPA strategy and combining with an online parameter identification method, it solves the problem that the MTPA operating point is difficult to calculate online. Pre-calibrated and method independent of ambient temperature

Method used

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  • Permanent magnet synchronous motor maximum torque current ratio control method based on parameter identification
  • Permanent magnet synchronous motor maximum torque current ratio control method based on parameter identification
  • Permanent magnet synchronous motor maximum torque current ratio control method based on parameter identification

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Embodiment 1

[0018] A method for controlling the maximum torque-to-current ratio of a permanent magnet synchronous motor based on parameter identification, the control method comprising the following steps:

[0019] Step 1: When the parameters of the motor are nonlinear functions, determine the identification of the flux linkage;

[0020] Step 2: Determine the identification of the derivative of the flux linkage change at the operating point;

[0021] Step 3: Based on the MTPA control rate formed by the derivative of the flux linkage change at the working point in step 2;

[0022] Step 4: Obtain the command value of the current based on the MTPA control rate in step 3.

[0023] Further, the parameters of the motor in step 1 are nonlinear functions, specifically,

[0024] Motor parameter Ψ d , Ψ q for i d i q The nonlinear function of the permanent magnet flux linkage Ψ f It is difficult to accurately identify, so it is not calculated separately to improve the accuracy of the system;...

Embodiment 2

[0083] A 750W permanent magnet synchronous motor was used to carry out related experiments. First, through the actual test, the actual MTPA current curve of the motor was obtained as a comparison; then another set of MTPA current curves was obtained by using the algorithm proposed in this patent. Through comparison, it was found that The proposed algorithm of the present invention is relatively close to the actual MTPA current curve as image 3 shown.

[0084] Figure 4 It is the actual dq-axis current in the no-load state of the motor. It can be seen from the figure that the motor current contains the injected sinusoidal signal of small amplitude.

[0085] Figure 5 is the current dynamic response waveform of the motor, iq changes from 0A to 10A, and then decreases to 0A, and id changes the corresponding current according to the algorithm proposed in this patent.

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Abstract

The invention discloses a permanent magnet synchronous motor maximum torque current ratio control method based on parameter identification. The method comprises the following steps: 1, when a parameter of a motor is a non-linear function, determining identification of a flux linkage; 2, determining the identification of the derivative of the flux linkage change at the working point; 3, forming an MTPA control rate based on the derivative of the flux linkage change at the working point in the step 2; and 4, obtaining an instruction value of the current based on the MTPA control rate in the step 3. According to the method, the control condition of the novel MTPA strategy is adopted, the online parameter identification method is combined, the problem that the MTPA working point is difficult to calculate online is solved, pre-calibration is not needed, and the method is not influenced by the environment temperature.

Description

technical field [0001] The invention belongs to the field of drive control of permanent magnet synchronous motors, and in particular relates to a method for controlling the maximum torque-current ratio of permanent magnet synchronous motors based on parameter identification. Background technique [0002] At present, most interpolated permanent magnet synchronous motors adopt the Maximum Torque Per Ampere (MTPA) control strategy. Because the electrical parameters of the motor are affected by the ambient temperature of the motor working state machine, they are volatile, so the MTPA working curve is difficult to directly Calculation requires a large amount of testing work to calibrate the MTPA working curve, and the workload is relatively large. In addition, the pre-calibrated curve cannot compensate the operating temperature of the motor, and there is still a certain deviation in actual use. Contents of the invention [0003] The present invention provides a method for cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08H02P6/28H02P21/14H02P21/22H02P25/022
CPCH02P6/08H02P21/14H02P25/022H02P2205/01H02P2207/05H02P6/28H02P21/22
Inventor 杜博超姚凯程远崔淑梅
Owner HARBIN INST OF TECH
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