Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

Transistor DefinitionA transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.Diffused TechniqueThis method creates planar transistors on a nearly flat wafer. An N-type wafer is heated in a furnace with P-type gas impurities, causing the P-type region (base) to form on the wafer. A mask with holes is used, and the wafer is heated again with N-type impurities. This creates the N-type region (emitter) on top of the P-type layer.At last, a thin layer

What is Diode Current Equation?Diode Current Equation DefinitionThe diode current equation expresses the relationship between the current flowing through the diode as a function of the voltage applied across it. Mathematically the diode current equation can be expressed as: I is the current flowing through the diodeI0 is the dark saturation current,q is the charge on the electron,V is the voltage applied across the diode,η is the (exponential) ideality factor.is the Boltzmann constantT is the ab

What is a Square Wave Inverter?Square wave inverter definitionSquare wave inverter is an electronic device that converts direct current into alternating current, and its output alternating current waveform is in the form of square wave.Working principleThe working principle of the square wave inverter is based on simple switching technology. It uses electronic switches (such as relays or transistors) to periodically turn on and off DC power, resulting in alternating currents. Since the waveform

What is Variable Frequency Drive?Variable Frequency Drive DefinitionA variable frequency drive is a device that regulates the speed and torque of an AC motor by altering the frequency and voltage of its power supply.Core ComponentsA VFD consists of a rectifier to convert AC power to DC, a capacitor to stabilize this DC power, and an inverter to convert the DC back to AC with variable frequency.Operational MechanismA variable frequency drive works by changing the frequency and voltage of the powe

What is the EMF Equation of DC Generator?EMF definitionElectromotive force (EMF) in a DC generator is defined as the voltage generated by the movement of a conductor through a magnetic field.Faraday's lawThis law explains that the induced electromotive force in a generator conductor is proportional to the rate at which it crosses the magnetic field line.Generator groupA DC generator consists of a conductor, a magnetic field, an armature, a magnetic pole, and a winding path, which together affect

Torque equation definitionThe torque in the three-phase induction motor is calculated based on rotor current, magnetic flux and power factor.Rotor currentThe rotor current is critical for generating torque and is affected by the induced electromotive force and impedance of the rotor.Starting torqueStarting torque is the torque generated when the induction motor is started. We know that at the beginning of the rotor speed, N is zero.Therefore, just by placing the value of s=1 in the torque equati

What is a Squirrel Cage Induction Motor ?Squirrel-cage induction motor definitionA squirrel cage induction motor is a motor with a rotor that looks like a squirrel cage and operates based on electromagnetism. The rotor is a steel-laminated cylindrical assembly containing a highly conductive metal such as aluminum or copper. When alternating current flows through the stator windings, it creates a rotating magnetic field. The process induces an electric current in the rotor, which creates its own

What are the Torque Slip Characteristics of Induction Motor?Torque Slip Characteristics DefinitionThe torque slip characteristics of an induction motor describe how its torque changes with slip.SlipSlip is the difference between synchronous speed and actual rotor speed, divided by synchronous speed.The torque-slip characteristic curve can be divided roughly into three regions: Low slip region Medium slip region High slip regionMotoring ModeIn motoring mode, the motor runs below synchronous speed

What is the Equivalent Circuit for an Induction Motor?Equivalent Circuit DefinitionThe equivalent circuit of an induction motor shows its internal parameters like losses using inductors and resistors. The induction motor always runs below the synchronous or full load speed and the relative difference between the synchronous speed and speed of rotation is known as slip which is denoted by s. Where, Ns is synchronous speed of rotation which is given by-Where, f is the frequency of the supply volta

Equivalent Circuit DefinitionAn equivalent circuit of a transformer is a simplified model used to calculate impedance, resistance, and leakage reactance.Primary Side Equivalent CircuitTo draw the equivalent circuit referred to the primary side, use the general equivalent circuit and modify it for primary side calculations.Excitation BranchThe primary current splits into no-load and load components, requiring a parallel path in the equivalent circuit known as the excitation branch.Approximate Equ