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A Position Sensorless Direct Torque Control Method for Hybrid Excitation Synchronous Motor

A technology of direct torque control and hybrid excitation synchronization, which is applied in the field of electric transmission, can solve the problems of insufficient torque dynamic response, high control system price, and easy failure, etc., to improve system reliability and fast torque dynamic response , The effect of high torque dynamic response

Active Publication Date: 2018-02-06
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of the above control strategy is continuous control, which is relatively smooth; the disadvantage is that the torque dynamic response is not fast enough, and the rotation coordinate transformation is required, which is more complicated
Due to the presence of sensors, the control system is more expensive, prone to failure, and less reliable

Method used

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  • A Position Sensorless Direct Torque Control Method for Hybrid Excitation Synchronous Motor
  • A Position Sensorless Direct Torque Control Method for Hybrid Excitation Synchronous Motor
  • A Position Sensorless Direct Torque Control Method for Hybrid Excitation Synchronous Motor

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with embodiment and accompanying drawing.

[0051] figure 2 In order to realize the system block diagram of the position sensorless direct torque control method of the hybrid excitation synchronous motor of the present invention, the control system consists of an AC power supply, a rectifier, a voltage stabilizing capacitor, a DSP controller, a main power converter, an auxiliary power converter, current and voltage sensor, hybrid excitation synchronous motor, etc.

[0052] The AC power supplies power to the entire system. After being rectified by the rectifier, the voltage is filtered and stabilized, and sent to the main and auxiliary power converters. The Hall voltage sensor collects the bus voltage and sends it to the controller after conditioning. The output terminals of the main and auxiliary power converters are connected to the hybrid excitation synchronous motor, and the Hall current transform...

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Abstract

The invention discloses a direct torque control method for a hybrid excitation synchronous motor without a position sensor. A sliding film observer is used to estimate the rotational speed and initial position of the hybrid excitation synchronous motor. The overall control idea is based on the direct torque control method. Judging the motor operating area according to the speed, the motor runs in the low speed area, and adopts id=0 control. When the load torque is less than or equal to the rated torque, there is no need for magnetization control; when the load torque is greater than the rated torque, the magnetization control is performed. The motor runs in the high-speed area, adopts field-weakening control, first keeps id=0, and uses the excitation current if to carry out field-weakening; when the field current if reaches the rated value, uses the d-axis current id to carry out field-weakening. The position sensorless direct torque control of the hybrid excitation synchronous motor reduces the cost and improves the reliability and torque quick response capability of the drive system.

Description

technical field [0001] The invention belongs to the technical field of electric transmission, and relates to a direct torque strategy without a position sensor, in particular to a control method for a hybrid excitation synchronous motor. Background technique [0002] Hybrid excitation synchronous motor is a kind of wide speed regulation motor developed on the basis of permanent magnet synchronous motor and electric excitation synchronous motor. Its main purpose is to solve the problem that the air gap magnetic field of permanent magnet synchronous motor is difficult to adjust. The hybrid excitation synchronous motor has two excitation sources, one is permanent magnet and the other is electric excitation. The magnetic potential generated by the permanent magnet is the main magnetic potential, and the magnetic potential generated by the excitation winding is the auxiliary magnetic potential. This motor combines the advantages of permanent magnet synchronous and electric excita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/30H02P21/13
Inventor 林明耀赵纪龙
Owner SOUTHEAST UNIV
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