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Permanent magnet synchronous motor starting control method based on hypothetical reference frame strategy

A technology of permanent magnet synchronous motor and coordinate method, which is used in motor control, motor generator control, AC motor control, etc., to achieve the effect of no jitter in rotation speed, improving speed control accuracy, and improving system performance.

Active Publication Date: 2018-11-23
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, although many experts and scholars have proposed a large number of sensorless control algorithms, each algorithm has certain limitations.

Method used

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  • Permanent magnet synchronous motor starting control method based on hypothetical reference frame strategy
  • Permanent magnet synchronous motor starting control method based on hypothetical reference frame strategy
  • Permanent magnet synchronous motor starting control method based on hypothetical reference frame strategy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0061] In each control algorithm execution cycle, the following steps execute a cycle, where the execution cycle is defined as T s , such as T s =166us.

[0062] a1. Determine whether it is in the process of starting and accelerating, if so, go to step a2, if not, go to step a7;

[0063] a2. Obtain the motor speed estimated by the voltage vector amplitude according to formula (9);

[0064]

[0065] a3. According to the set switching speed ω 2 and switching speed ω 3 , when the given speed ω s *less than ω 2 , execute step a4; when the given speed ω s * greater than or equal to ω 2 and less than or equal to ω 3 , execute step a5; when the given speed ω s * greater than ω 3 , execute step a6;

[0066] a4. Set the given speed ω s * and the estimated rotational speed ω calculated in step a2 e 'Perform PI regulator to obtain figure 2 The error limit value A in:

[0067] A=k ep ·(ω s *-ω e ')+k ei ∫(ω s *-ω e ') dt (10)

[0068] Among them, k ep 、k ei are t...

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Abstract

The invention discloses a permanent magnet synchronous motor starting control method based on a hypothetical reference frame strategy. The permanent magnet synchronous motor starting control method has the advantages that the internal temperature is not changed in consideration of the situation that a motor is just started, the motor back electromotive force constant is still a design value at themoment, and when non-load starting, the amplitude of the voltage vector is almost in direct proportion to the rotational speed of the motor; the point is used for adjusting the rotational speed estimated correction amplitude limiting value in the hypothetical reference frame strategy, so that the non-speed smooth starting of the permanent magnet synchronous motor can be realized in the algorithmcontrol adopting speed and current double closed loops without the switching process of two control algorithms; and in addition, the control over an exciting current can improve the speed control precision and improve the system performance in the starting process, so that it is ensured that no sudden change in a phase current and a rotor position is achieved in the starting process of the permanent magnet synchronous motor, and no jitter is achieved in the rotational speed.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous motor control, in particular to a speed and current double-closed-loop control method based on an assumed rotating coordinate method in the starting control process of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motor has the advantages of small size, high power density, high efficiency, simple structure, low noise and fast dynamic response, and has been widely used in electric vehicles, air-conditioning compressors, elevators, pumping units and other fields. Usually, the permanent magnet motor performs closed-loop control after obtaining the speed signal through the encoder feedback. However, in many applications, such as fans, water pumps, air-conditioning compressors, etc., the encoder not only increases the installation and maintenance costs, but also makes the drive system susceptible to external environment interferenc...

Claims

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Application Information

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IPC IPC(8): H02P21/18H02P21/22H02P6/182H02P25/022
CPCH02P6/182H02P2205/07H02P21/18H02P21/22H02P25/024
Inventor 胡庆波邱雪娜黄晶何金保应宏微
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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