Electrical Articles Archive
Effect of voltage unbalances parameter
Three phase motors are designed to work on three phase’s voltages equal or nearly equal. In conditions of voltages unbalance voltages in three phases becomes unequal which may lead motor to a significant problem such as: Excess
Types of motor enclosure
Broadly enclosures are categorized as : Open type Totally enclosed type Motor with open enclosures provides air cooling of motor windings as it features ventilation openings to allow the same. The common type of this is open
What is gear driver ?
There are many types of gear drives such we : Helical Spur Bevel Worm gear Helical and bevel gear drive are most preferred and quite efficient out of them. Spur gears though found in many older systems,
What are core lamination
Laminations mitigate the eddy currents. The iron core is formed by laminations dipped in insulating varnish. Sliced core offers very less width to circulated eddy currents. Silicon steel sheets to replace with solid core break up the
Isolating transformer
Usually, the electrical transformer is used to either step up or step down the voltage. It hardly does anything to minimize the crossing of noise or transients from primer to secondary. Circuit impedances can be by using
What is belt drives
One-third populations of motors in industrial and commercial sectors include belt drive as it avoids transmission loss. Increase decrease in the speed of the drives equipment is achieved with pulleys of various diameters. A well-designed belt transmission
What is changing to a different winding
In the rewinding with the option, lap winding is often preferred to be used as it includes all the same coils. This is quite acceptable if it results in the same amounts of flux per pole as
What is copy rewinding
If as noted earlier when details of manufacturer’s original winding are preserved the core can be made ready for rewinding. The points which will remain same as those of original windings are: Coils pitch Turns/ coils Connections
Types of re-lamping
There are two types of re-lamping: Groups re-lamping Sport re-lamping Group re-lamping Group re-lamping is a preventive approach. In this lamps are replaced to ensure a light level when lamps in the area reach 80% of their
Current balancing procedure
Thick over all possible combinations of phase load changes at each 3-phase connection point for either single-phase supplies or loads. When all selections have been made, consider the order in which loads are connected. It is so