Maximum torque per ampere vector control system and control method for position sensor-free internal permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and maximum torque current, which is applied in vector control system, control system, motor generator control, etc., and can solve problems such as poor accuracy of current given value and complicated calculation method

Inactive Publication Date: 2012-07-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing maximum torque current ratio control strategy has complex calculation methods and poor accuracy of the current given value, and provides a maximum torque current of a permanent magnet synchronous motor without a position sensor. Ratio vector control system and control method

Method used

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  • Maximum torque per ampere vector control system and control method for position sensor-free internal permanent magnet synchronous motor
  • Maximum torque per ampere vector control system and control method for position sensor-free internal permanent magnet synchronous motor
  • Maximum torque per ampere vector control system and control method for position sensor-free internal permanent magnet synchronous motor

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specific Embodiment approach 1

[0055] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the maximum torque current ratio vector control system of the permanent magnet synchronous motor with built-in position sensor described in this embodiment, it includes a permanent magnet synchronous motor 1, it also includes an inverter 2, a space vector pulse width modulation unit 3. Three-phase-two-phase coordinate transformation unit 4. Stationary-rotating coordinate transformation unit 5. Fourier analysis unit 6. Vector angle adjustment unit 7. Speed ​​regulator 8. Maximum torque-to-current ratio control unit 9. First current Regulator 10, second current regulator 11, rotation-stationary coordinate transformation unit 12 and rotor position and speed observer 13,

[0056] The rotor position and speed observer 13 collects the a-phase stator current i of the permanent magnet synchronous motor 1 a , phase c stator current i c , DC bus voltage u of inverter 2 dc and the swi...

specific Embodiment approach 2

[0059] Specific implementation mode two: the following combination figure 2 Describe this embodiment, this embodiment is based on the control method of the maximum torque current ratio vector control system of the non-position sensor built-in permanent magnet synchronous motor described in the first embodiment: it includes the following steps:

[0060] Step 1: Feedback value i of the q-axis current of the permanent magnet synchronous motor 1 q and the d-axis current feedback value i d Perform Fourier analysis to extract the DC component of the q-axis current and the DC component of the d-axis current;

[0061] Step 2: Average the q-axis current DC component and the d-axis current DC component in one current cycle obtained in step 1, and output them to the vector angle adjustment unit 7;

[0062] Step 3: Calculate the square of the current vector amplitude by the vector angle adjustment unit 7 according to the average value of the q-axis current DC component and the d-axis c...

specific Embodiment approach 3

[0065] Specific implementation mode three: the following combination image 3 Describe this embodiment. This embodiment is a further description of Embodiment 2. In the step 1, the q-axis current feedback value i of the permanent magnet synchronous motor 1 q and the d-axis current feedback value i d Perform Fourier analysis to extract the DC component of the q-axis current and the DC component of the d-axis current. The specific method is as follows:

[0066] The acquisition method of the q-axis current DC component is the same as that of the d-axis current DC component. The following takes the acquisition method of the d-axis current DC component as an example to illustrate:

[0067] The Fourier analysis unit 6 collects the d-axis current feedback value i each time d After that, using the current accumulator i sum Accumulate the d-axis current feedback value id, and use the counter count1 to count the number of current acquisitions;

[0068] Determine whether the current ...

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Abstract

The invention discloses a control method of a maximum torque per ampere vector control system for a position sensor-free internal permanent magnet synchronous motor, and belongs to the field of motor control. The problems of complexity of a computing method and low accuracy of an obtained current set value in the conventional maximum torque per ampere control strategy are solved. The control system comprises a permanent magnet synchronous motor, an inverter, a space vector pulse width modulation unit, a three-phase-two-phase coordinate conversion unit, a static-rotational coordinate conversion unit, a Fourier analysis unit, a vector angle regulation unit, a rotating speed regulator, a maximum torque per ampere control unit, a first current regulator, a second current regulator, a rotational-static coordinate conversion unit and a rotor position and rotating speed observer. According to the control method, the magnitude of current amplitude is automatically regulated and compared on the basis of a current vector angle gamma, and an operating point with maximum torque per ampere is automatically searched. The system and the method are applied to maximum torque per ampere vector control over the motor.

Description

technical field [0001] The invention relates to a maximum torque-to-current ratio vector control system and a control method of a built-in permanent magnet synchronous motor without a position sensor, belonging to the field of motor control. Background technique [0002] The built-in permanent magnet synchronous motor has the asymmetry of the rotor magnetic circuit structure. Compared with the surface-mounted permanent magnet synchronous motor, using this asymmetry, the output torque will contain reluctance torque when the appropriate control method is adopted, thereby improving the torque output capability. Its high torque-to-current ratio, high power-to-mass ratio and high efficiency are more and more favored by people. In order to make full use of these characteristics of the interior permanent magnet synchronous motor and improve the overload capacity and power density of the motor, the maximum torque-to-current ratio control strategy can be used in the control system. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/12H02P21/22
Inventor 王高林于泳杨荣峰徐殿国李刚
Owner HARBIN INST OF TECH
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