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Non-position sensing control method for electric vehicle drive motor

A technology of electric vehicles and drive motors, applied in the field of position sensor technology, to achieve the effects of saving hardware costs and maintenance, solving the difficulties of detection, and solving the effects of magnetic pole convergence

Inactive Publication Date: 2014-11-19
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above methods all have their own scope of application, and there is no method that can make all kinds of permanent magnet synchronous motors run perfectly and stably at full speed

Method used

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  • Non-position sensing control method for electric vehicle drive motor
  • Non-position sensing control method for electric vehicle drive motor
  • Non-position sensing control method for electric vehicle drive motor

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] A position sensorless control method for a drive motor of an electric vehicle, comprising initial position detection, low-speed position detection, medium-speed position detection and high-speed position detection, specifically comprising the following steps:

[0027] (1) Initial position detection: use the pulse voltage injection method to detect the rotor position, apply the space voltage vector to the armature winding of the motor, use the difference in the time constant of the equivalent circuit, and determine the initial position of the rotor by comparing the decay time of the response current, the shortest The voltage vector angle corresponding to the decay time is the initial angle of the rotor; finally, it is guaranteed that the electric vehicle can achieve no reverse rotation and start with the maximum torque;

[0028] (2) Low-speed section position det...

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Abstract

The invention discloses a non-position sensing control method for an electric vehicle drive motor. The method comprises the steps of using a pulse voltage injection method for detecting an initial position of a drive motor rotor before an electric vehicle is started; and in order to conduct accurate detection, using a rotary high-frequency voltage injection method at a low speed section for real-time detection of the position of the drive motor rotor after the electrical vehicle is started; in order to avoid multiple salient pole effects of a motor, adding a double salient pole decoupling observer onto a structure of the high-frequency voltage injection method, at an intermediate speed, combining the high-frequency injection method and the counter electromotive force method and through a neural network controller to process and detect the position of the drive motor rotor, and at a high speed, using the counter electromotive force method to detect the position of the drive motor rotor; and meanwhile, adding a rotor position robust observer to solve the problem that the observer converges statuses of an opposite position to a rotor magnetic pole due to external interference at the high speed. According to the invention, the rotor position information of the electric vehicle drive motor can be accurately and effectively detected.

Description

technical field [0001] The invention relates to a position-sensing control method for driving motors of electric vehicles, which combines pulse voltage injection method, rotating high-frequency voltage injection method, back electromotive force method, neural network controller, double salient pole decoupling observer and rotor Position Robust Observer Combined with Position Sensor Technology. Background technique [0002] The development of electric vehicles is the inevitable product of the oil crisis and people's environmental requirements. Compared with internal combustion engine vehicles, electric vehicles are powered by on-board power supplies, drive wheels with electric motors, and meet the requirements of road safety regulations for vehicles. . Due to the high power density and fast, precise and high control performance of permanent magnet synchronous motors, it is the first choice for electric vehicles. Permanent magnet synchronous motor (PMSM) is widely used in el...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 余海涛孟高军胡敏强黄磊
Owner SOUTHEAST UNIV
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