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Control method, device, storage medium and terminal for permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and control method, which is applied in the direction of motor generator control, electromechanical transmission control, electronic commutation motor control, etc., and can solve problems such as poor portability and versatility, limitation of formula method, and changes in motor parameters , to achieve good dynamic response characteristics, improve dynamic response, and improve the effect of running speed

Active Publication Date: 2022-07-12
TONGJI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) There are complex formulas in the actual control process of the formula method, which needs to rely on accurate motor parameters. The motor parameters will inevitably change during the operation process, and the hardware requirements are high, so the application of the pure formula method is limited.
[0005] (2) The look-up table method needs to carry out experimental tests and summarize the parameter table, so the portability and versatility are poor
[0006] (3) The running effect of the curve fitting method will be affected by the order of the fitting function. The higher the order, the better the fitting effect, but it will occupy computing resources

Method used

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  • Control method, device, storage medium and terminal for permanent magnet synchronous motor
  • Control method, device, storage medium and terminal for permanent magnet synchronous motor
  • Control method, device, storage medium and terminal for permanent magnet synchronous motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] like figure 1 A schematic flowchart of the control method of the permanent magnet synchronous motor of the present embodiment, the specific steps include:

[0046] Step S11. Establish the torque equation of the permanent magnet synchronous motor. Since the actual model of the motor is relatively complex, it will be affected by factors such as magnetic saturation, temperature change, iron core eddy current and hysteresis loss. Expressed as:

[0047]

[0048] where p n Indicates the number of pole pairs of the motor, L d and L q respectively represent the d-axis and q-axis components of the stator winding inductance in the d-q rotating coordinate system, i d and i q respectively represent the d-axis and q-axis components of the stator winding current in the d-q rotating coordinate system, ψ f represents the rotor flux linkage.

[0049] Step S12. Based on the torque equation, obtain the leftward constant torque direction of the permanent magnet synchronous motor...

Embodiment 2

[0071] Image 6 It is a schematic structural diagram of a control device for a permanent magnet synchronous motor in an embodiment of the present invention, including: a motor torque equation module 61 for establishing the torque equation of the permanent magnet synchronous motor; a constant torque direction module 62, based on the torque equation, to obtain the constant torque direction of the permanent magnet synchronous motor to the left; the current drop gradient module 63 is used to establish the current cost function of the permanent magnet synchronous motor to obtain the current drop gradient; the motor operating point position module 64 is used to calculate all the The quantity product of the current descending gradient and the leftward constant torque direction is used to obtain the position of the motor operating point; the current compensation module 65 calculates and obtains a current compensation value according to the position of the motor operating point, which i...

Embodiment 3

[0075] This embodiment provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, implements the control method of the permanent magnet synchronous motor.

[0076] Those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by hardware related to computer programs. The aforementioned computer program may be stored in a computer-readable storage medium. When the program is executed, the steps including the above method embodiments are executed; and the foregoing storage medium includes: ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

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Abstract

The present invention provides a control method, device, storage medium and terminal of a permanent magnet synchronous motor. The method includes: establishing a torque equation of a permanent magnet synchronous motor; obtaining a leftward constant torque direction of the permanent magnet synchronous motor based on the torque equation; establishing a current cost function of the permanent magnet synchronous motor to obtain a current drop gradient ; Calculate the quantity product of the current drop gradient and the leftward constant torque direction to obtain the position of the motor operating point; Calculate and obtain the current compensation value according to the position of the motor operating point, which is used to perform the maximum rotation of the motor Torque current ratio control. The solution of the invention can automatically adjust the permanent magnet synchronous motor to the maximum torque-current ratio trajectory operating point corresponding to the current load, reduce the copper consumption of the motor, improve the operating efficiency of the motor, effectively reduce the amount of calculation, and improve the running speed and dynamic Responsiveness.

Description

technical field [0001] The invention relates to the field of permanent magnet synchronous motor control, in particular to a control method, device, storage medium and terminal of the permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motor has the advantages of simple structure, small size, high efficiency and high power factor. In recent years, with the continuous research and application of high-performance permanent magnet materials, permanent magnet synchronous motors have been widely used in aerospace, medical equipment, new energy electric vehicles and other fields. Among them, the built-in permanent magnet synchronous motor can make full use of its reluctance torque to improve the load carrying capacity of the built-in permanent magnet synchronous motor because the permanent magnets are buried inside the rotor, resulting in asymmetric rotor magnetic circuit. Among them, the maximum torque to current ratio (MTPA) control min...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/22H02P21/20
CPCH02P21/22H02P21/20Y02T10/72
Inventor 廖志明史军伟郭敬东张葆华林国斌李枝亮张辉
Owner TONGJI UNIV