Rajendra Mistry

An induction motor — Keep it running

This paper discusses factors that affect the life and durability of an induction motor. Various topics include overall construction of an induction machine and its components, field and operating conditions, motor vibration, operating temperatures, installation practice and proper motor selection for special environment and application conditions. Sound motor design, proper selection of the motor to suit the application, proper field installation, and good maintenance are key factors essential for long term motor reliability.

Motors and generators: Preventing moisture formation

The majority of induction motors and/or generators are installed in places characterized by the formation of moisture inside the machines due to environmental conditions. The amount of moisture formation will depend on many variables, and it is difficult to predict how much moisture will form. If this moisture is not removed or prevented, it can be harmful to the operation and reliability of the machines. It can shorten the winding insulation life, and the down time can be costly. This paper discusses conditions which contribute to moisture formation and in-depth discussion of various methods available to remove and/or prevent the formation of moisture. This text concentrates on a simple method using different types of heating elements, their selection, restrictions such as installation, surface temperature, applicable codes, requirements, etc. For motors and generators designed for operation in hazardous areas, using a heating element such as a space heater can reduce the risk of the motor igniting as the moisture will be removed from the winding insulation. Although these devices may seem small and insignificant, many variables may affect their use. The risk of improper usage can be high and potentially result in significant costs and delays during machine startup and commissioning.

Rotating machines — Pros and cons of monitoring devices

Rotating machines such as motors, generators, turbines, and compressors utilize many different types of monitoring devices. These devices are critical for the long term reliable operation of rotating machines. Some measuring devices will add significant knowledge of the performance and therefore add value and reliability, while others add little to no value but will add substantial cost. The pros and cons of using each of the many different types of devices and what can be determined from the measurement need to be evaluated before installation. Simply installing the device may not add the expected reliability. This paper will discuss parameters of monitoring, setting of control limits, and the application of various monitoring devices.

Crucial for Rotating Machines: Types and Properties of Lubricants and Proper Lubrication Methods

Any rotating machine has at least one rotating element, which can be a rotor of an electric motor or a turbine, compressor, or pump and is supported by the sleeve bearings or rolling element bearings. The reliable operation of rotating machinery can be critical for bottom-line production goals and financial results in petrochemical, transportation, and chemical products processing. Lubrication performs a crucial role in the reliable operation of rotating machines. This article will discuss the different types of lubricants, their properties, proper methods of lubrication, appropriate frequency, and consequences of not adhering to the proper maintenance processes.

Longevity of an induction motor

This paper discusses factors that affect the longevity and durability of an induction motor. Various topics include overall construction of an induction machine and its major components, field and operating conditions, motor vibration, operating temperatures, installation practice and proper motor selection for special environment and application conditions. Sound machine design, proper selection of the motor to suit the application, proper field installation, and good maintenance are key factors essential for long term motor reliability and its performance.

Effect of drive system component compatibility on motor vibration

Within the engineering industry, it is a known fact that there are a multitude of cases where the individual components test satisfactorily; however, when the parts are combined, the net sum performance is not as good as the individual parts. Static and dynamic compatibility of the individual drive system component should be matched together in order to achieve a satisfactory system performance. This paper will focus on a few areas where an improvement can be achieved by examining the compatibility of the coupled components. The driver, driven connections, and bearings are the main contributors to the system dynamic compatibility, in addition to the mounting bases and foundations. Motors that are powered by adjustable-speed drives (ASDs) usually require additional design features to accommodate drive influence on the motor. Since these motors run by ASD operate at variable speeds, their dynamic compatibility with the ASD analysis is particularly important.

Lubrication - Crucial for rotating machines

Any rotating machine has at least one rotating element. This element can be a rotor of an electric motor or a turbine, compressor or pump. This element is supported by the sleeve bearings or rolling element bearings. Rotating machinerys reliable operation can be critical for the bottom line production goals and financial results in petrochemical, transportation and chemical products processing. The lubrication performs a crucial role in reliable operation of these rotating machineries. This paper will discuss the different types of the lubrications, their properties and proper methods of lubrications, frequencies and consequences of not adhering to the proper maintenance processes.