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A method of field weakening and speed expansion for permanent magnet synchronous motors with high dynamic response

A permanent magnet synchronous motor, field weakening and speed expansion technology, applied in the direction of motor generator control, generator control, motor control, etc., can solve the problem of unsatisfactory quick response, and achieve improved emergency avoidance and emergency braking Performance, high overload power, fast dynamic response effect

Active Publication Date: 2021-01-22
深圳市启玄科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional field weakening control is mostly aimed at steady-state performance, and does not meet the requirements in terms of quick response

Method used

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  • A method of field weakening and speed expansion for permanent magnet synchronous motors with high dynamic response
  • A method of field weakening and speed expansion for permanent magnet synchronous motors with high dynamic response
  • A method of field weakening and speed expansion for permanent magnet synchronous motors with high dynamic response

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: The speed expansion control effect of propulsion propeller of underwater submersible

[0031] This embodiment 1 gives the effect of field weakening and speed expansion of a permanent magnet synchronous motor driving an underwater propeller load. image 3 The control effects of the traditional vector control and the method of the present invention are given. The traditional vector control speed, current, and voltage responses are as follows: image 3 Shown in (a), (c), (e), the rotating speed of the inventive method, electric current, voltage response are respectively as follows image 3 (b), (d), (f) shown. When the rotational speed is given as 800rpm, the motor rotational speed of the traditional vector control is only 670rpm when the inverter voltage u reaches the maximum, but the maximum rotational speed of the method of the present invention can reach the given rotational speed of 800rpm, and the response time is within 2s. The response time of the t...

Embodiment 2

[0035] Example 2: Expansion effect of constant load

[0036] This embodiment gives the effect of field weakening and speed expansion of a permanent magnet synchronous motor under constant load. Figure 4 The control effects of the traditional vector control and the method of the present invention are given. The traditional vector control speed, current, and voltage responses are as follows: Figure 4 Shown in (a), (c), (e), the rotating speed of the inventive method, electric current, voltage response are respectively as follows Figure 4 (b), (d), (f) shown. When the rotating speed is given as 1200rpm, the motor rotating speed of the traditional vector control is only 720rpm when the inverter voltage u reaches the maximum. The actual rotating speed of the method of the present invention can reach the given rotating speed of 1200rpm, and the response time is within 2s. The field weakening control enabling threshold of the method of the present invention is ω th =600, give...

Embodiment 3

[0040] Embodiment 3: Compatibility of field weakening control in non-field weakening area and traditional vector control

[0041] The method of the present invention starts the field weakening control by comparing the threshold value of the given speed and the actual speed. When there is a certain margin in the setting of the speed threshold, there is a situation where the field weakening control is started in a non-field weakening area, and the field weakening control is required. Compatible with traditional vector control to avoid oscillation and abnormal control.

[0042] This embodiment shows the compatibility of the field-weakening control of the method of the present invention with the traditional vector control when operating in the non-field-weakening area. When traditional vector control is adopted, the motor speed can reach 720rpm when the inverter voltage u reaches the maximum, and the speed, current, and voltage responses are as follows: Figure 4 (a), (c), (e) sh...

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Abstract

The invention discloses a high-dynamic-response flux-weakening speed extension method of a permanent magnet synchronous motor, comprising the steps of comparing, by a flux-weakening function module, omega<*> and omega continuously with omega<*> and omega; if comparison results meet a condition, allowing an enable signal ENABLE to be 1, and enabling a d-axis speed regulator to finish a function where when it is given according to an error of omega<*> and omega that d-axis current given i<*><d> does not meet the condition, not activating the enable signal, wherein the d-axis current given i<*><d>=0 is vector having traditional d-axis current being zero; subjecting d-axis and q-axis current given i<*><d> and i<*><q> respectively to d-axis and q-axis current regulators, calculating with the regulators to give d-axis voltage u<d1> and q-axis voltage u<q1>, and processing the d-axis voltage u<d1> and q-axis voltage u<q1>, by a synthetic voltage amplitude-limiting module with d-axis voltage reserving, to obtain u<d> and u<q>. The method has the advantages that high-dynamic flux-weakening speed extension control similar to traditional vector control in speed loop performance can beprovided, no oscillations occur during the control process, and the high-dynamic flux-weakening speed extension control and the traditional vector control can be seamlessly switched.

Description

technical field [0001] The invention belongs to the technical field of motor drive control, and relates to a method for controlling the field weakening and speed expansion of a permanent magnet synchronous motor with high dynamic response. Background technique [0002] The magnetic field acting on the armature in the permanent magnet synchronous motor is generated by permanent magnets, which is not adjustable. Therefore, the permanent magnet synchronous motor cannot realize the speed expansion operation by directly adjusting the magnetic field generated by the permanent magnet, and a field weakening control algorithm is required to realize it. [0003] In the traditional field weakening control method, the distribution of d-axis and q-axis current given values ​​largely depends on the precise model equations of the motor, such as the maximum torque-current ratio curve, voltage and current limit equations, etc., and the degree of field weakening can be adjusted more Based on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00
CPCH02P21/0085H02P2207/05
Inventor 王宝超胡建辉王骞江善林赵猛李勇尚静刘承军赵博
Owner 深圳市启玄科技有限公司
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