How to Calculate the pH Level of a Cleaning Solution
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…
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The Source of Noise
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…
Is Your Motor Suitable for Frequency Converter Operation
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.
Enjoy Freedom Of Choice In Specifying Ventilation Systems
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…
Harmonics and What You Can Do About It
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…
The Path to Prolonged Life for VFD’s and Motors Begins with Proper Maintenance
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…
The Source of Noise
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…
Is Your Motor Suitable for Frequency Converter Operation
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.
Enjoy Freedom Of Choice In Specifying Ventilation Systems
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…
Harmonics and What You Can Do About It
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…
The Path to Prolonged Life for VFD’s and Motors Begins with Proper Maintenance
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…
