The pH of an aqueous (water-based) solution is the measure of how acid or basic the solution is. Solutions with a pH less than 7 are said to be acid and solutions with a pH greater than…
Variable Speed Drives control the speed of AC motors by varying the frequency and voltage of the electrical supply to the motor. What a VSD basically does is convert the mains AC input into a DC voltage…
If you are thinking about connecting an electric motor to a variable frequency drive, there are three aspects that must be taken into consideration. These aspects are insulation stress, bearing stress and thermal stress.
Independent tests at The Institut für Luft- und Kältetechnik (Institute of Air Handling and Refrigeration) in Dresden/Germany have shown that from an energy-efficiency perspective, a Permanent Magnet (PM) motor controlled by a frequency converter is the model…
The purpose of this article is to provide a brief introduction to the available alternative harmonic mitigation methods, with particular reference to ac variable frequency drives and with special attention given to the ‘Slim DC-Link’ method. Fourier…
One of the main factors for obtaining long reliable service from any piece of equipment is maintenance. Any type of electrical or mechanical device is subject to wear and tear. This can be further aggravated by undesirable…