As we start into ESA theories and application, we will have to spend a little time on electric motor theory. As we will start out with a basic system, AC motors are the simplest in terms of operation and components, we will start out with AC induction motors. Using this base knowledge, we can later…
It does happen, although rarely, in typical industrial environments that an electric machine will die of old age. The reason is that machines are often exposed to contamination issues, other environmental issues, power issues or a combination of events that degrade the insulation slowly or rapidly. There is also a rule of reliability that should…
Free Seminar April 20, 2020 from noon to 1pm CST We will discuss the art of EMPATH data collection and analysis of wind turbine generators, gearbox, main bearings and blades from the voltage and current. We will discuss how the data is collected and the approach to analysis. This will be exclusive for wind companies…
Free Live Seminar for April 17, 2020 from noon to 1pm CST In this presentation we will work step-by-step how to analyze an electric motor, sheaves, belts and fan including related bearings using real field data. The demonstration will be with the EMPATH system but applies to other current and electrical signature analysis. GoToWebinar to…
Kevin Alewine of Shermco and I presented at the American Wind Energy Association Operations and Maintenance Conference (AWEA O&M). The EMPATH data on just under 400 generators and powertrain resulted in 772 findings on a specific manufacturer’s generators. The general industry findings for these generators are: The findings from the EMPATH evaluations: The generator findings…
Abstract— Electrical Signature Analysis is the application and analysis of Voltage and Current data collected on electrical machinery systems. The measurements are converted to amplitude modulated Fast Fourier Transforms that can be evaluated for power, machine and powertrain conditions. Electrical and mechanical conditions are determined through their effects on the airgap magnetic field. One of…
Howard W Penrose, Ph.D., CMRP MotorDoc LLC, www.motordoc.com The term MCA (Motor Circuit Analysis) is derived from a test method that provides information on the basic components of an alternate-current (AC) or direct-current (DC) electric motor. These basic components include: resistance, measured in Ohms; impedance, measured in Ohms; inductance, measured in Henries; the induction winding…
An evaluation of several insulation types at various degrees of vacuum using repetitive discharge inception and extinction voltage offline testing will be presented. Insulation systems were evaluated in atmosphere and compared to values to 1mmHg using a commercial partial discharge surge tester. The insulation systems evaluated include unvarnished windings, dip and bake epoxy, epoxy trickle…
