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Indirect torque observer-based sensor-less efficient control of bearingless switched reluctance motor using global sliding mode and square currents control method

Rao Pulivarthi Nageswara, Devarapalli Ramesh, Marquez Fausto Pedro Garcia, Kumar G. V. Nagesh, Mohammadi-Ivatloo Behnam

Archives of Control Sciences

2021

Vol. 31, No. 1

53--80

The Bearingless Switched Reluctance Motor (BSRM) is a new technology motor, which overcomes the problems of maintenances required associated with mechanical contacts and lubrication of rotor shaft effectively. In addition, it also improves the output power developed and rated speed. Hence, the BSRM can achieve high output power and super high speed with less size and cost. It has a considerable ripple in the net-torque due to its critical non-linearity and the salient pole structures of both stator and rotor poles. The resultant torque ripple, especially in these motors, causes the more vibrations and acoustic noises will affects the levitated rotor safety also. Practically at high-speed operations, the accurate measurement of the rotor position is complicated for conventional mechanical sensors. A new square currents control with global sliding mode control based sensorless torque observer is proposed to minimize the torque ripple and achieve a smooth, robust operation without using any mechanical sensors. The proposed controller is designed based on the error between the reference and measured torque values. The sliding mode torque observer measures the torque from the actual phase voltages, currents, and look-up tables. The simulation model has been modelled to validate the proposed methodology. From the simulation outputs, it is clear that the reduction of torque ripple by the proposed method shows improved than the conventional sliding mode controller. The overall system is more robust to the external disturbances, and it also gets efficient torque profile.

FEM Analysis and Field Oriented Control Simulation of Bearingless Actuator

Wagner J., Maga D., Sitar J., Uhlik P., Hartansky R.

Machine Dynamics Problems

2004

Vol. 28, No. 4

177-184

This paper deals with a bearingless rotary machine that is capable of stable controlling the levitated position of a rotor of an induction motor with a squirrel-cage type rotor under loaded conditions. This bearingless induction machine is capable to serve as an electric motor and also as a magnetic bearing for magnetically levitating and supporting the rotor of the machine. The stator has winding for rotating the rotor and winding for positional control of the rotor in a given radial position. The paper deals with the field oriented control of the bearingless induction machine. Simulations were done with parameters of designed machine based on classical induction motor with mechanical bearings. Designed machine has four-pole drive winding and additional winding to centre the rotor in the machine. Both windings are distributed in the stator slots. Power and voltage rating of the four-pole winding is 3kW/220V and of the two-pole winding for levitation is 250W/30V. Simulation results of the whole system are presented.