An Improving Hysteresis Current Control Method Based on FOC Technique for Induction Motor Drive

Abstract

The paper presents an improving speed control method using a field-oriented control (FOC) technique for the hysteresis current (HC) controller in the induction motor drive. The basic principle of a controller applying hysteresis band current is comparing reference currents and the measured currents to generate switching pulses for controlling an inverter. In the typical FOC for the HC controller, the rotor flux angle’s value will increase to infinity due to the integral algorithm’s error accumulation. This problem can lead to the faulty operation of the induction motor drive (IMD) system. In this paper, a current model with the advantage of precisely determining the periodic rotor flux angle is used in the FOC technique to provide reference currents for the current controller. The rotor flux angle will periodically change according to the motor speed in the range [-π π] during the operation of IMD. The operation of the induction motor drive is implemented and tested by MATLAB/SIMULINK software. The simulation results have demonstrated the effectiveness of the HC control method-based FOC technique with periodic rotor flux angle in controlling motor speed. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.

Sensor Fault Diagnosis Method Based on Rotor Slip Applied to Induction Motor Drive

“…The RSL is used as a criterion to distinguish between the failure and noise of the current sensors. The mathematical expressions to determine the reference rotor slip [9] can be described below:…”

“…The field-oriented control (FOC), a typical method belonging to the vector control group, is a modern technique for IMDs. IMDs applying the FOC technique can precisely control torque and rotor flux based on the orthogonal current components in the rotation coordinate system [7][8][9][10]. For operating efficiently, an IMD controlled by the FOC algorithm requires proper feedback signals from sensors, including two current sensors and a speed encoder.…”

A Sensor Fault-Tolerant Control Solution Based on Current Observers Applied to Three Phase Induction Motor Drive

“…In the stationary coordinate [α, β], the machine equations are described as follows: The FOC method is utilized to speed control based on independent control of rotor flux and torque by separating the current space vector into two perpendicular components [x, y]. The i Sx controls the rotor flux as the rated value, and the i Sy controls torque [9]. Figure 1 shows the separation of the stator current space vector in detail.…”

“…The FOC is a modern method for the speed controlling of IMDs. The IMs using the FOC method can accurately control both the torque and the flux by applying the orthogonal compo-nents of the current vector corresponding to a rotation coordinate line in the rotor flux [7][8][9][10]. An IMD that uses precise control algorithms such as FOC will require accurate feedback from sensors, typically consisting of at least two current sensors integrated into the converter and one mounted speed sensor at the rotor shaft for obtaining efficient operation.…”