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Position-sensor-free control method suitable for four-quadrant operation of switch reluctance motor

A technology of switched reluctance motor and control method, applied in the direction of single motor speed/torque control, electronic commutator, etc., can solve the problems of high failure rate of position sensor and affecting system reliability, etc.

Inactive Publication Date: 2013-11-20
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] In order to solve various disadvantages brought by the position sensor to the switched reluctance motor control system, the present invention provides a position sensorless control method suitable for the four-quadrant operation of the switched reluctance motor, which solves the problem that the existing control method affects the reliability of the system operation, especially It is a problem that the failure rate of the position sensor is higher in harsh environments such as humidity, vibration, and dust

Method used

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  • Position-sensor-free control method suitable for four-quadrant operation of switch reluctance motor
  • Position-sensor-free control method suitable for four-quadrant operation of switch reluctance motor
  • Position-sensor-free control method suitable for four-quadrant operation of switch reluctance motor

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Embodiment 1

[0039] Embodiment 1: The control method is based on the Fourier series expression of the switched reluctance motor inductance, and a simplified inductance model is established; the inductance at three special positions of the switched reluctance motor is fitted by online measurement of different phase currents. The functional relationship of the inductance model parameters with the phase current transformation, and then establish the nonlinear inductance model of the switched reluctance motor; deduce the analytical formula for estimating the rotor position of the switched reluctance motor based on the nonlinear inductance model; when the motor is running, real-time detection Phase current and voltage, the excitation phase flux linkage is estimated according to the voltage equation, the excitation phase inductance is obtained, the current rotor position is calculated by using the derived rotor position estimation analytical formula, and the sensorless switching reluctance motor i...

Embodiment 2

[0064] Embodiment 2: Take a three-phase 12 / 8-pole 18.5kw switched reluctance motor as an example, and describe it in detail with reference to the accompanying drawings.

[0065] The position sensorless control method of the switched reluctance motor provided by the present invention comprises the following steps:

[0066] Under different phase current conditions, the inductance of each phase of the motor is measured at three special positions, namely, where the rotor and stator poles are completely aligned, where the rotor and stator poles are in the middle position, and where the rotor and stator poles are completely misaligned.

[0067] attached figure 1 It is the electromagnetic characteristic curve data of the 18.5kw prototype, which is provided by the attached figure 1 The electromagnetic characteristics of the motor shown in can be indirectly calculated to obtain the phase inductance curves of the prototype under different saturation conditions, as shown in the attached...

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Abstract

The invention discloses a position-sensor-free control method suitable for four-quadrant operation of a switch reluctance motor, and belongs to a switch reluctance motor control method. The position-sensor-free control method comprises the following steps of constructing a simplified inductance model according to a fourier series expression of inductance of the switch reluctance motor; fitting a function relation in which an inductance model parameter is changed along with phase current by measuring inductances at three special positions of the switch reluctance motor at different phase currents on line, and constructing a non-linear inductance model of the switch reluctance motor; deriving an analysis formula for estimating a position of a rotor of the switch reluctance motor through phase inductance according to the non-linear inductance model; and when the motor runs, detecting the phase current and phase voltage in real time, estimating an excitation phase magnetic chain according to a voltage equation to obtain excitation phase inductance, calculating the current position of the rotor according to the estimation analysis formula by using the derived position of the rotor, and realizing sensor-free running control over the switch reluctance motor according to the estimated position of the rotor. The algorithm is simple, small in calculated amount, favorable for real-time implementation of a micro controller and higher in position estimation precision.

Description

technical field [0001] The invention relates to a control method of a switched reluctance motor, in particular to a position sensorless control method suitable for four-quadrant operation of a switched reluctance motor. Background technique [0002] The switched reluctance motor speed control system is a motor speed control system that integrates special motors, power electronics technology, control theory and computer technology. It has strong and durable structure, low manufacturing cost, large starting torque, high efficiency, good reliability, and flexible control mode, so it has been widely used in mine electric traction systems, aerospace, household appliances, electric vehicles and other fields. [0003] Real-time and accurate motor rotor position information is an important basis for high-performance control of switched reluctance motors. In current practical applications, shaft position sensors or other types of detection position detectors are generally used to ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08H02P6/18
Inventor 王鹏飞李学锋黄玉龙王从刚邓庆伟刘学权
Owner CHINA UNIV OF MINING & TECH
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