Pulse injection-based three-phase switched reluctance motor position sensorless control method

Abstract

The invention relates to the technical field of position sensorless control of switched reluctance motors, in particular to a position sensorless control method for three-phase switched reluctance motors based on pulse injection. The invention proposes a three-phase switched reluctance motor position sensorless control method based on pulse injection, which is suitable for the control of three-phase switched reluctance motors. Phase chopper control is performed, the phase current is detected by the current sensor, and the current slope difference is calculated. Then, the three-phase equivalent inductance is obtained according to the current slope difference, and the inductance vector is synthesized. Finally, the rotor position information is extracted from the inductance vector to obtain the rotor speed. The invention has the advantages of simple structure and easy realization, greatly reduced calculation amount, and high reliability and precision.

Description

technical field [0001] The invention belongs to the technical field of position sensorless control of switched reluctance motors, and in particular relates to a position sensorless control method for three-phase switched reluctance motors based on pulse injection with simple structure, high reliability and high precision. Background technique [0002] Switched reluctance motor (Switched Reluctance Motor, SRM), also known as "reluctance motor", has a simple structure, flexible control, simple power converter, reliable operation, and has broad application prospects. For the switched reluctance motor drive system (SwitchedReluctanceMotorDrives, SRD), accurate rotor position is a necessary condition for the stable operation of the motor. For some industrial applications with harsh environments, such as coal mining machines, the detection accuracy and reliability of traditional position sensors are seriously affected. In recent years, the development of sensorless control system...

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Problems solved by technology

APositionSensorlessControlSystemofSRMoverWideSpeedRange.The7thInternationalConferenceonPowerElectronics: 640~643 adopts the current flux linkage method. The basic idea is that according to the salient polarity effect of the motor, different rotor positions correspond to different flux linkage-current curves, and the reference flux linkage is obtained through the current look-up table. However, this method Requires a large amount of table lookup data, poor portability

RotorpositionobserverforsensorlesscontrolofSRM, XIXSymposiumElectromagneticPhenomenainNonlinearCircuits, Maribor, Slovenia, 28-30june2006, pp.161~162 uses the Luenberger observer to calculate the rotor angle through the current and voltage signals in the operation of the switched reluctance motor. This method has a relatively large amount of calculation, and the observer linear model Sensitive to parameters, poor robustness

ANNbasedsensorlessrotorpositionestimationfortheSwitchedReluctanceMotor[C].NirmaUniversityInternationalEngineering(NUiCONE), 2011:1-6 adopts the neural network intelligent control method, which can approach any nonlinear rational function in theory, but requires a large number of training samples, and there is still a big gap from the actual application

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