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A Fast Start Method for Asynchronous Start Permanent Magnet Synchronous Motor Based on Torque Characteristics

A permanent magnet synchronous motor and asynchronous starting technology, which is applied to the starter, starting device, motor generator/starter of a single synchronous machine, etc., to improve the starting ability of the motor and the synchronous ability of pulling in, smooth starting, and shortened starting the effect of time

Active Publication Date: 2021-08-06
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the inadequacies of the existing asynchronous start permanent magnet synchronous motor starting methods, which exist in various torque mutual constraints and influences, and cannot effectively use the asynchronous torque and synchronous torque that the motor can provide for starting, the present invention proposes a According to the torque characteristics of the motor when it is running at different speed stages, asynchronous starting and maximum synchronous torque starting are combined to achieve a fast starting method for the motor with the purpose of outputting the maximum torque

Method used

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  • A Fast Start Method for Asynchronous Start Permanent Magnet Synchronous Motor Based on Torque Characteristics
  • A Fast Start Method for Asynchronous Start Permanent Magnet Synchronous Motor Based on Torque Characteristics
  • A Fast Start Method for Asynchronous Start Permanent Magnet Synchronous Motor Based on Torque Characteristics

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Embodiment 1

[0043] Such as figure 1 , figure 2 , image 3 , Figure 7 and Figure 8 As shown, a fast starting method of an asynchronous starting permanent magnet synchronous motor based on torque characteristics, the starting topology based on the fast starting method includes: control processing module, dual-channel motor drive module, switching module, asynchronous starting permanent magnet synchronous The motor and its encoder; the control processing module mainly includes the main controller, the dual-channel motor drive module includes two parts: the asynchronous synthetic torque starting drive unit and the maximum synchronous torque starting drive unit, and the switch module includes switches K1 and K2, of which , the switch K1 is connected with the asynchronous synthetic torque starting drive unit, and the switch K2 is connected with the maximum synchronous torque starting drive unit;

[0044] This quick start method proceeds as follows:

[0045] (1) When the motor needs to b...

Embodiment 2

[0065] Such as Figure 4 As shown, in this embodiment, on the basis of implementation case 1, in all stages of asynchronous synthetic torque starting, the main controller controls the asynchronous synthetic torque starting drive unit so that it outputs the rated frequency of the controlled motor but is higher than the rated voltage The power supply, thereby increasing the magnitude of the asynchronous synthetic torque Tav(s) of the motor (the principle is that the asynchronous torque is proportional to the voltage), thereby increasing the torque during the starting process and reducing the number of starting mode switching points. After the motor is started, the asynchronous synthetic torque starting drive unit outputs the power supply of the rated voltage and frequency of the controlled motor, so that the motor can run stably under the rated state.

[0066] In the second embodiment, the number of switching points for regulation is reduced by boosting the voltage.

[0067] Th...

Embodiment 3

[0069] Such as Figure 5 As shown, according to the relationship between the voltage U and the slip s in the asynchronous synthetic torque Tav(s) of the motor in this embodiment, the functional relationship between U and s is determined when the asynchronous synthetic torque Tav(s) of the motor is constant during the speed-up process . Based on the implementation of Case 1, in all asynchronous synthetic torque starting stages, the main controller controls the asynchronous synthetic torque starting drive unit according to the motor slip rate, so that it outputs the corresponding drive unit under the real-time slip rate during the starting process. The power supply of the voltage U supplies power to the motor, thereby ensuring that the asynchronous synthetic torque of the motor remains constant under different slip ratios, thereby realizing smooth and fast starting.

[0070] In this embodiment, the starting torque can be improved and its stability can be ensured, and the starti...

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Abstract

The invention discloses an asynchronous starting permanent magnet synchronous motor fast starting method based on torque characteristics. The method organically combines asynchronous self-starting and phase jump type maximum synchronous torque starting. According to the torque characteristics of the motor during the starting process, the maximum permanent magnet synchronous torque is used to make up for the staged insufficient output of the asynchronous synthetic torque, and the rapid start of the motor is realized for the purpose of starting with the maximum torque output. The starting method of the present invention combines the maximum starting torque that the motor can provide under the two starting modes of asynchronous starting and maximum synchronous torque starting, ensures the maximum starting torque of the motor, shortens the starting time, and improves the starting ability of the motor. Effectively avoid problems such as failure of starting of asynchronous starting permanent magnet synchronous motor due to excessive braking torque of power generation or inability to be pulled into synchronization in the later stage of starting.

Description

technical field [0001] The invention relates to the field of asynchronous starting permanent magnet synchronous motors, in particular to a quick starting method for ensuring the maximum torque starting of the asynchronous starting permanent magnet motor and shortening the starting time. Background technique [0002] The asynchronous starter permanent magnet synchronous motor can be started by directly connecting the three-phase AC power supply when starting. When the rotor is pulled into the synchronous speed and runs stably, it has the advantages of high power factor and high efficiency of the permanent magnet synchronous motor. Because of its convenient starting and energy saving, it is gradually replacing asynchronous AC motors in many applications. However, the rotor of an asynchronously started permanent magnet synchronous motor has both a cage bar or a conductive sleeve for starting and a permanent magnet. The starting process is more complicated than that of an ordina...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/20H02P1/50
CPCH02P1/50H02P6/20
Inventor 邱洪波邹旭田刘小梅贾宛英伊然乔建伟陈振超许亚男丁艺伟
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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