Position Sensorless Control of Switched Reluctance Motor under Magnetic Field Saturation

Abstract

When the switched reluctance motor is running, as the motor phase current increases, the magnetic circuit of the motor will gradually saturate, which affects the estimation of the special position of the motor rotor. Aiming at the above problems, this paper proposes a positionless control method for switched reluctance motors under the condition of magnetic field saturation. Firstly, the Fourier phase inductance function of switched reluctance motor is established, and then the component of Fourier phase inductance function affected by magnetic field saturation is eliminated mathematically. Research the method of estimating the position and angle of the rotor based on the inductance positioning point. This paper takes a 12\8 motor as an example to verify the effectiveness of the method by simulation.

Studying permanent magnet synchronous motor sensorless control technology

“…This formula (6) shows that in addition to being related to the position angle error, the number i qin also has a relationship by modulating the signal sinωt, and it is related to its change over time as well. According to the following strategy, signals on the q-axis indicating high-frequency currents should be extracted by means of the following procedure.…”

“…A positionless system block diagram is shown above for the PLL-based pulsed high-frequency voltage injection system being described above. The system model can be established under a MATLAB/Simulink environment .In the simulation, the following parameters of the motor were included for reference:number of pole pairs P n =2; stator inductance L d =0.00473H, L q =0.009H; stator resistance R=0.45Ω; flux linkage ψ f =0.683Wb; rotational inertia J=0.008 Kg*m 2 [6] . It can be observed that in the simulation time of 4 seconds, the pulsed high-frequency voltage signal is 15V in amplitude and the frequency is 1000Hz [7] .…”