Simplex vs Duplex Windings in DC Machines

The term simplex and duplex windings are linked to DC machines the rotor/armature winding in DC machines are classified into two types based on the plex of windings. Differences between Simplex and Duplex Windings Feature Simplex Windings Duplex Windings Rotor Construction It comprises of a single, complete, closed winding wound on a rotor It comprises … Read more

Turbo Alternator – Introduction, Working, and Construction

The turbo generator is an electrical generator that is connected to the shaft of a steam turbine or gas turbine for electric power generation. Turbo generators are employed for high shaft rotational speeds (usually steam and gas turbines). Its rotor is of non-salient pole-type construction that usually has two poles. Two pole turbo alternators operate … Read more

Impact of AC Electric Current on the Human Body

Impact of AC Electric Current on Human Body Amount of current Effect on body 1 mA or less No sensation is experienced with current less than 1 mA More than 5 mA Painful shock is experienced 10 to 15 mA Exposure to current may cause muscle contractions, which can cause some people to experience “freezing” … Read more

Ampacity of Conductor

The ampacity of conductor is defined as the measure of its ability to carry electric current. The ampacity depends on different factors including the type of material, cross-sectional area, and type of area where the installation of conductors is being carried out. All types of metals conduct electric current, however conduction properties of metals vary. … Read more

Rotor Slots in Squirrel Cage Induction Motor – Top 5 Factors to be Considered by Electrical Design Engineers while Specifying Number of rotor slots

While manufacturing squirrel cage rotor motors, one of the most important aspects which Design Engineers should consider is the number of rotors slots in reference to the number of selected stator slots. Rotor slots are abbreviated using Sr while stator slots are abbreviated using Ss. Electrical Design Engineers should carefully select appropriate combination of stator … Read more

Three Phase Transformer vs Three Phase Transformer Bank

On the basis of number of phases transformers can be categorized either as single phase or three. A single-phase transformer comprises of a single-phase primary and a single-phase secondary placed with either core or shell-type construction. On the other hand three phase transformer has three-phase primary and three-phase secondary that is placed with either core … Read more

Top 10 Differences between Core Type and Shell Type Transformer – Core vs Shell Type Transformer

Electrical transformers are often classified into two categories based on the construction of their core. There are two types of transformers in this regard: Core type transformers and Shell type transformers. The core-type transformer involves construction in which windings encircle the core. While shell-type construction involves construction in which the core encircles the winding. Given … Read more

Specific Electric Loading in Electrical Motors

The specific electric loading is abbreviated as AC in italics ‘ac’ and it is defined as the RMS ampere conductors per meter of armature periphery at the air gap surface. Mathematical formula for ac: ac= (Total number of armature ampere conductors)/(Armature periphery at air gap) The selection of a particular value of specific electric loading … Read more

Air Gap in Three Phase Induction Motor

The air gap in three-phase induction motors impacts the performance of the machine. Air gap length is usually abbreviated by l with subscript g. That is lg Formula to find the air gap length Where: D = Diameter in meters L = Length in meters Power Factor The air gap and power factors are inversely … Read more