Temperature Estimation Techniques In Electric Motors and Reduce The Failures

Temperature Estimation Techniques In Motor Windings Seminar Report

The organic materials used for stator winding insulation are subject to deterioration from thermal, electrical, and mechanical stresses. Stator winding insulation breakdown due to excessive thermal stress is one of the major causes of electric machine failures; therefore, prevention of such a failure is crucial for increasing machine reliability and minimizing nancial loss due to motor failure. Two major types of temperature estimation techniques, thermal model-based and parameter-based temperature techniques, reveals that neither method can protect motors without sacri cing the estimation accuracy or motor performance.Based on the evaluation of the advantages and disadvantages of these two types of temperature estimation techniques, a new on-line stator winding temperature estimation scheme for small to medium size mainsfed induction machines is proposed .The new stator winding temperature estimation scheme is based on a hybrid thermal model.By correlating the rotor temperature with the stator temperature, the hybrid thermal model uni es the thermal model-based and the parameter-based temperature estimation techniques.

Three-phase induction machines are used extensively in modern industry due to their cost e ectiveness, ruggedness and low maintenance requirements. A single industrial facility may have thousands of induction motors operating along its assembly lines. As a result of this coordinated operation, malfunction of an induction motor cause nancial losses not only associated with the individual repair or replacement, but also losses associated with the down time of the entire assembly line and the loss of productivity. For this reason, reliable motor operation is crucial in many industrial processes.According to IEEE Industry Applications Society (IAS) and Electric Power Research Institute (EPRI) surveys, most of the motor failures are related to the stator winding insulation and iron core[1]-[3]. These failures are primarily caused by severe operating conditions, such as cyclic overload operation or harsh operating environments,such as those in the mining or petrochemical industries.Although induction motors are rugged and reliable, the stator winding insulation failure is potentially destructive.It often leads to stator winding burnout and even total motor failure.

• Direct Temperature measurement

>Temperature estimation based on thermal model

>Dual-element Time-delay Fuses

>Thermal Models with a Single Time Constant

>Temperature Estimation Based on Motor Parameters

>Resistance Estimation Using DC Injection

• HYBRID THERMAL MODEL

>Full Order Hybrid Thermal Model

>Analysis Of Full Order Hybrid Thermal Model

>Analysis of the Full Order HTM Thermal Parameters

>Reduced Order Hybrid Thermal Model

• INDUCTION MACHINE ON-LINE PARAMETER ESTIMATION 

>On-line Calculation of Rotor Temperature 

>On-line Inductance Estimation

>Rotor Temperature Calculation

>On-line Parameter Tuning

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Key:Thermal model, Parameter based temperature estimation,Hybrid model,Temperature generation in motor windings,Motor winding temperature control system,control system for motor windings,failure test for motor windings,thermal models for induction motors,power system seminar reports and ppt.