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

What is Motor Generator Set?Motor Generator Set DefinitionA motor generator (M-G) set is defined as a device consisting of a motor and a generator mechanically coupled through a common shaft. It’s used to convert electrical power from one form to another, such as converting voltage, phase, or frequency. Motor generator sets also convert voltage, phase, and frequency of power. They help isolate electrical loads from the supply line. Here is a picture of an M-G set.Here a motor and a generator are

Wave Winding: Simplex, Duplex, Retrogressive And Progressive Wave WindingsKey learnings:Wave Winding Definition: A wave winding is defined as a type of armature winding where the end of one coil connects to the start of another, creating a wave-like pattern.Simplex Wave Winding: Simplex wave winding has odd back pitch and front pitch that are nearly equal and suitable for high voltage, low current machines.Duplex Wave Winding: Duplex wave winding involves two parallel paths and is used for highe

Magnetization Curve of DC GeneratorKey learnings: Magnetization Curve Definition: The magnetization curve of a DC machine shows the relationship between field current and armature terminal voltage on an open circuit. Importance: The magnetization curve indicates the saturation of the magnetic circuit, crucial for understanding the generator’s efficiency. Saturation Point: This point, also known as the knee of the curve, shows where further increases in field current yield minimal increases in fl

Hunting in Synchronous MotorKey learnings: Hunting Defined: Hunting in a synchronous motor is the phenomenon where the rotor oscillates around a new equilibrium position due to sudden changes in load. Causes of Hunting: Hunting can be caused by abrupt load changes, sudden field current adjustments, harmonic torque loads, or faults in the supply system. Effects of Hunting: This instability may cause the motor to lose synchronism, induce mechanical stresses, increase losses, and elevate temperatur

Synchronous Motor ExcitationPrior to understanding this synchronous motor excitation, it should be remembered that any electromagnetic device must draw a magnetizing current from the AC source to produce the required working flux. This magnetizing current lags by almost 90o to the supply voltage. In other words, the function of this magnetizing current or lagging VA drawn by the electromagnetic device is to set up the flux in the magnetic circuit of the device.The synchronous motor is doubly fed

Contents Working Principle of Synchronous Machine Using Chopper Further Development of Synchronous Machine Using Chopper Conclusion of Synchronous Machine Using ChopperKey learnings: Excitation Control Definition: Excitation control is defined as managing the DC field excitation in a synchronous machine to control its performance. Working Principle: The working principle of a synchronous machine using a chopper involves stepping up the voltage and controlling it through PWM signals to achieve th

Contents Working Principle of Synchronous Machine Using Chopper Further Development of Synchronous Machine Using Chopper Conclusion of Synchronous Machine Using ChopperKey learnings: Excitation Control Definition: Excitation control is defined as managing the DC field excitation in a synchronous machine to control its performance. Working Principle: The working principle of a synchronous machine using a chopper involves stepping up the voltage and controlling it through PWM signals to achieve th

What is Swinburne Test of DC Machine?Swinburne Test DefinitionThe Swinburne test is an indirect method for testing DC machines, named after Sir James Swinburne. It’s a simple and common test for shunt and compound wound DC machines with constant flux. This test pre-determines the machine’s efficiency at any load by running it as either a motor or generator and measuring no load losses separately.The circuit setup for Swinburne’s test uses a shunt regulator to adjust the machine’s speed to the ra

What is the Starting of DC Motor?Starting current definitionThe starting current in a DC motor is defined as the initial large current that flows when the motor starts and needs to be limited to prevent damage.The action of counterelectromotive forceThe back electromotive force is the voltage generated by the rotation of the motor, which is the opposite of the supply voltage and helps regulate the starting current.Starting method of DC motorThe main method of limiting the starting current involv

What is a Four Point Starter ?4 Point Starter DefinitionA 4 point starter protects the armature of DC shunt motor or compound wound DC motor from the high starting currents that occur when the motor starts.The 4 point starter has a lot of constructional and functional similarity to a 3 point starter, but this special device has an additional point and coil in its construction (as the name suggests). This brings about some difference in its functionality, though the basic operational characterist