Method for initially positioning and starting switched reluctance motor without position sensor

A switched reluctance motor and initial positioning technology, which is applied in the direction of electronic commutator, AC motor control, electrical components, etc., can solve the problem of large error in estimation methods, and achieve the effects of avoiding wrong selection, simple implementation, and easy implementation

Inactive Publication Date: 2010-12-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Although the idea of ​​this method is ingenious, although the inductance curve changes periodically, the inductance curve is not a stand...

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  • Method for initially positioning and starting switched reluctance motor without position sensor
  • Method for initially positioning and starting switched reluctance motor without position sensor
  • Method for initially positioning and starting switched reluctance motor without position sensor

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Embodiment Construction

[0022] According to the relationship between the inductance and the position of the rotor, the invention realizes the judgment of the initial opening phase and the estimation of the initial position of the rotor when the motor is stationary.

[0023] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0024] figure 1 A block diagram of a switched reluctance motor speed control system. The switched reluctance motor speed control system is mainly composed of a switched reluctance motor (SRM), a power converter, a control system (DSP+CPLD), a position sensor, and a voltage and current detection and protection circuit. Among them, the controller is the core of the system, which collects, calculates and processes the detection signal, completes the relevant control algorithm, and outputs the corresponding control signal. The inductance calculation and the algorithm of the position sensorless technology in the present inventi...

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Abstract

The invention discloses a method for initially positioning and starting a switched reluctance motor without a position sensor, and belongs to the technical field of control of the switched reluctance motor. The method comprises the following steps of: setting an inductance bottom threshold value LLow and an inductance top threshold value LHigh based on the basic characteristic that the inductance of the switched reluctance motor periodically changes with the position of a rotor; injecting short pulses into each phase winding and calculating inductance values according to a phase voltage equation; judging phases which can be currently switched on according to the relation among each phase inductance calculated value and LLow and LHigh and selecting estimated phases of an initial position angle at the same time; and establishing a phase inductance mathematical model to obtain angle information in the selected phases by using the relation between the inductance mathematical model and the inductance calculated values. Though the method, an initial switch-on phase selection signal can be accurately acquired and the initial position angle of the rotor can be calculated at the same time, so the switched reluctance motor can be started and initially positioned without the position sensor, an algorithm is simple and generality is high.

Description

technical field [0001] The invention relates to a method for initial positioning and starting without a position sensor of a switched reluctance motor, belonging to the technical field of switched reluctance motor control. Background technique [0002] For switched reluctance motor systems, real-time and accurate rotor position information is a prerequisite for reliable operation and high-performance control. In current practical applications, shaft position sensors or other detecting position detectors are generally used to obtain position information, which not only increases the cost and complexity of the system, but also reduces the reliability of the entire system operation, especially in some high temperature, high speed and oil pollution conditions. Under harsh operating conditions such as the environment, the work of traditional position sensors is limited, which limits the scope of application of this type of motor, making its inherent performance of high temperatur...

Claims

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Application Information

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IPC IPC(8): H02P6/18H02P25/089
Inventor 蔡骏邓智泉
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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