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Accelerated Optimization & Advanced Analysis for Electrical Machines and Drives Boost Motor and Drive Testing Productivity, Capability and Data Analysis

Mike Hoyer, Applications Engineer • HBM Test and Measurement

Evaluating motor efficiency has become extremely important since significant efforts are focused on more efficient electrical machines and drives. The main issue is how to implement an accelerated procedure that obtains the motor or drive efficiency for all operating points safely, accurately and rapidly. Ordinary test methods using a typical power analyzer only offer inadequate numerical results. To get beyond numerical results, all electrical, mechanical and physical signals must be acquired simultaneously at high sample rates coupled with advanced real-time custom analysis and fast data transfer to automation systems making it possible to accurately and rapidly perform electric motor and drive efficiency mapping and almost any type of advanced analysis. MORE

Common Mode Chokes or Cores Cannot Prevent Bearing Failure in All Motors

H. William Oh • Electro Static Technology

In recent years, manufacturers of common mode chokes or cores (CMCs) have increased their efforts to market these devices as a means of preventing bearing failures in PWM VFD/inverter-driven motors. CMCs are not new; they have been applied to power electronics for decades. This article will discuss the basic principle of how CMCs work and their effectiveness in mitigating bearing currents. MORE

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