A Positionless Control Method for Switched Reluctance Motor Based on Linear Inductance Conversion Method

A technology of switched reluctance motor and control method, which is applied in the direction of motor control, AC motor control, control system, etc., to achieve the effect of simple and easy method, less measurement work, and high estimation accuracy

CN113241992BActive Publication Date: 2022-06-21SHAANXI AVIATION ELECTRICAL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-06-21

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Abstract

The invention discloses a position sensorless control method of a switched reluctance motor based on a linear inductance characteristic conversion method. Due to the influence of magnetic field saturation, this method obtains the inductance characteristics of four special position switched reluctance motors through the torque balance method. According to the unsaturated inductance characteristics of the motor, the relationship between the unsaturated inductance and the current in the linear range is established. The real-time phase inductance is obtained by measurement and calculation, and the real-time phase inductance is converted into unsaturated inductance by using the proposed conversion model. According to the linear relationship between the unsaturated inductance and the rotor position, the corresponding motor rotor position information is finally calculated. The effectiveness of the method is verified by experiments. The method is simple and easy to implement, requires less measurement work, and has high estimation accuracy of rotor position information, and is suitable for medium and high speed applications.
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Description

technical field

[0001] The invention relates to a position sensorless control method of a switched reluctance motor based on a linear inductance conversion method, and belongs to the field of motor control. Background technique

[0002] With the rapid development of multiple all-electric aircraft, aviation aircraft have put forward an urgent demand for high-reliability and high-power-density starter-generator systems. Switched reluctance motors have the advantages of simple structure, no permanent magnets, wide speed regulation range and strong fault tolerance, and have certain advantages in the field of aviation aircraft starting and power generation. The high-performance control of switched reluctance starter generators is inseparable from accurate position information. However, in the high-temperature applications of multi-electric aircraft, mechanical sensors have a high failure rate, which makes it difficult to meet the reliability requirements of electric drive control...

Examples

Embodiment Construction

[0029] The embodiments of the present invention are described in detail below, and the embodiments are exemplary and intended to explain the present invention, but should not be construed as a limitation of the present invention.

[0030] The motor used in this embodiment is a 1kW three-phase 12 / 8-pole switched reluctance motor.

[0031] Step 1: Obtain the characteristics of the inductance versus current of the switched reluctance motor at four special positions by the torque balance method, including the non-saturated inductance L un (θ 1 ), L un (θ 2 ), L un (θ hr ), L un (θ a ), and the phase voltage and phase current of the switched reluctance motor are obtained by measuring the current sensor and voltage sensor; where θ 1 Represents the rotor position when the front edge of the stator of the switched reluctance motor coincides with the rear edge of the rotor, θ 2 Represents the rotor position when the front edge of the stator and the front edge of the rotor coinci...