Special Machines

Brushes are used in two main types of motors: DC motors and large synchronous motors, called wound-rotor synchronous motors. There is a third case in which brushes was used, the wound-rotor induction motor that has been obsolete for many years. In the DC motor case, the brushes transfer current into ...
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We are well aware of the fact that electrical machine core is made up of laminated sheets. This is done to reduce the eddy current loss. But how laminated core reduces the eddy current loss and what is the relation between the Eddy Current Loss and thickness of lamination? Let ...
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A universal motor is a special type of motor which is designed to run either on DC or single phase AC supply. Universal Motors are so named because they can run both on AC as well as DC. A universal motor has a high starting torque and variable speed characteristics ...
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Variable Frequency Transformer, VFT is quite a new technology to connect two asynchronous Grids. Asynchronous Grids mean two power systems operating at two different frequencies. The world’s first VFT was installed and commissioned in the year of 2004 at Hydro- Quebec’s Langlois substation, where it is used to exchange up ...
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