Electric transfer function model of switched reluctance motors and model‐based current control design

Abstract

SUMMARYThis paper presents a current control design for switched reluctance motors (SRMs). The electric transfer characteristic of the motors is studied first. Their transfer function is shown to be expressible by a pure resistive component, which is not constant but varies depending on the motor current and speed. The current control design for SRMs follows the classical design technique used for DC machines, where the zeros of the PI controller cancel the poles of Ls+R. Because the transfer function of SRMs does not have any poles, an I controller is suitable for them. The integral gain should be adjusted in order to compensate the nonlinearity, that is, the variation in the equivalent resistor of the SRMs' transfer function. The values of the integral gain are tuned and tabulated for the motor speed and current. Simulation and experiment demonstrate that the current and speed of the SRMs present good responses without dependence on the motor speed and current.

Predictive Current Control for Switched Reluctance Motor Based on Local Linear Phase Voltage Model

“…In [14,15], a Fourier series was used for modeling the incremental inductance and decoupling the effect of the back EMF. In [16], phase winding was modeled by a resistance that varied with the rotor speed and the average reference current, and a pure integral controller was used for controlling the average current in a 120-electrical-degree-wide conducting region. In [17,18], the fixed PI gains most suitable for different operating points were selected based on a piecewise linear flux linkage model.…”

A detailed magnetic equivalent circuit modeling for torque ripples minimizing of a switched reluctance motor

“…The modeling used for reluctance machines is mainly presented in three categories. The first category is the use of traditional classical models, the compressed equivalent electrical circuit . In these models, the machine operation is usually presented by the inductance of phases under the alignment and misalignment conditions between the rotor and stator poles.…”