An Efficient Sensorless Slip Dependent Thermal Motor Protection Schemes Applied to Submersible Pumps

Abstract:

This paper proposes a sensorless procedure to estimate the induction motor speed and the dependable heat contents of the stator and rotor sides. The proposed procedure is based on the electrical models of a three phase Induction Motor (IM). The motor electrical models for normal and abnormal will be discussed and a technique is introduced for accommodating frequency dependent skin effect of the rotor resistance using a simple proposed speed estimation algorithm. The electrical models are customized from the positive and negative sequence networks. The speed detection is based on the rotor parameters slip dependent. The models are then used to analyze different operating conditions of the motor. Two thermal motor protection schemes are suggested. The first scheme is dependent on the stator side while the other scheme is developed for rotor side. The Matlab software is used for this purpose to emulate efficiently the proposed estimation procedures through a complete motor modeling which is fed from the power grid. Finally, the results provide the motor performance characteristics which involve current, torque, speed and stator/rotor temperature versus time for numerous operating conditions. It is concluded that the proposed sensorless procedure is efficient to protect the induction motors against abnormal starting as well as the overheating on either stator or rotor sides. Also, the proposed sensorless estimation for speed and temperature is reliable for submersible motor applications. The proposed schemes can be considered as costless preventive maintenance procedure.Index Terms: induction motor, slip dependent, sensorless, thermal model, abnormal operating conditions.

• Periodical: International Journal of Engineering Research in Africa (Volume 14)
• Pages: 75-86
• DOI: https://doi.org/10.4028/www.scientific.net/JERA.14.75
• Online since: March 2015
• Authors: Mohamed I. Abdelwanis*, Fatallah Selim, Ragab Abdelaziz El-Sehiemy
• Keywords: Abnormal Operating Conditions, Induction Motor, Sensorless, Slip Dependent, Submersible Pumps, Thermal Model

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