Direct torque control

Electrical engineering

Switched reluctance motor

Physics

Engineering

Control engineering

Torque

Artificial intelligence

Voltage

Rotor (electric)

Stall torque

Torque motor

Geometry

Control (management)

Stator

Machine control

Torque ripple

Commutation

Inductance

Mathematics

Computer science

Control theory (sociology)

Inflection point

Induction motor

Reluctance motor

Thermodynamics

IEEE Transactions on Industrial Electronics

This paper proposes a new position sensorless method for a direct torque control system using the inductance inflection point of a switched reluctance motor (SRM). The SRM essentially requires knowledge of the rotor position in the torque control system; this is because it generates torque by exciting the stator windings according to the rotor position. This rotor position information is an important factor used to obtain phase commutation point and to calculate instantaneous torque. Various rotor position detection methods have been used, but most of the methods increase the construction cost by requiring additional hardware and use many parameters for high-order analysis modeling, causing problems such as increasing the number of calculations. Therefore, in this paper, we propose a method using the inductance inflection point to solve these problems. It is possible to estimate the position of the rotor by detecting where the inductance inflection point occurs due to the rotor and stator overlapping with each other, and the phase commutation point and instantaneous torque can be calculated. The calculated instantaneous torque is used for direct torque control and torque ripple reduction through the torque-sharing function. The proposed method is verified through simulation and experiments.

Sensorless Direct Torque Control Using the Inductance Inflection Point for a Switched Reluctance Motor