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

Synchronous Motor DefinitionA synchronous motor is defined as a motor that runs at synchronous speed, determined by supply frequency and the number of poles.Where, Ns = synchronous speed, f = supply frequency and p = number of poles.Stator ComponentsStator FrameThe stator frame is the outer part of the motor, made from cast iron. It protects all the internal components of the motor. Stator CoreThe stator core is made from thin silicon laminations with an insulating surface coating. This reduces

Synchronous Motor DefinitionA synchronous motor is defined as a machine whose rotor speed is synchronized with the frequency of the current supply; it requires external methods for starting.f = supply frequency and p = number of poles.Self-Starting ChallengeDue to alternating magnetic forces that fail to move the rotor from a standstill, synchronous motors are not self-starting.Starting Methods of Synchronous MotorStarting a Synchronous Motor Using an Induction MotorBefore starting the synchrono

What is a Rotating Magnetic Field?Rotating field definitionWhen a three-phase power supply is applied to a three-phase distributed winding in a rotating machine, a rotating magnetic field is generated.Although the vector sum of the three currents in a balanced three-phase system is zero at any moment, the resultant magnetic field produced by these currents is not zero. Instead, it has a constant non-zero value that rotates over time.The magnetic flux produced by the current in each phase can be

What is The Synchronous Motor Model Diagram?Synchronous Motor DefinitionA synchronous motor is defined as an AC motor where the shaft rotation matches the frequency of the supply current.Synchronous Motor Circuit DiagramThe synchronous motor circuit diagram includes terminal voltage, effective resistance, leakage reactance, fictitious reactance, and synchronous reactance.Counter EMFCounter EMF is the voltage induced in the stator winding due to the rotating magnetic field, which opposes the appl

What are Synchronous Motors?Synchronous motor definitionA synchronous motor is an AC motor in which the rotation of the rotor is synchronized with the frequency of the supply current.Constant speed operationSynchronous motors operate at a constant speed called synchronous speed, which is determined by the number of poles of the motor and the frequency of power supply.N= The Synchronous Speed (in RPM – i.e. Rotations Per Minute)f = The Supply Frequency (in Hz)p = The number of PolesThe structure

What is Armature Reaction in DC Machine?Armature reaction definitionThe armature reaction in a DC motor is the effect of the armature magnetic flux on the main magnetic field, changing its distribution and intensity.Cross magnetizationCross-magnetization due to the armature current affects the magnetic field by moving the magnetic neutral axis, resulting in efficiency problems.Brush ShiftA natural solution to the problem appears to shift the brushes along the direction of rotation in generator a

What are the Methods of Improving Commutation?Commutation definitionCommutation is the process of reversing the current in the coil to keep the motor running efficiently.There are three main methods of improving commutation. Resistance commutation E.M.F. commutation Compensating windingsResistance CommutationIn this method of commutation we use high electrical resistance brushes for getting spark less commutation. This can be obtained by replacing low resistance copper brushes with high resistan

What is Commutation in DC Machine?Commutation definitionCommutation in a DC motor is defined as the process of converting alternating current generated in the armature winding to direct current using a commutator and a fixed brush.Continuous contactThis process requires continuous contact between the commutator segment and the brush to maintain the current conversion.Ideal commutationIdeal commutation means that the current is reversed within the commutation cycle to avoid sparks and damage.Curr

Three phase induction motor definitionThe three-phase induction motor is defined as a type of electric motor that is most widely used in industry due to its efficient power delivery and simple structure.Main component The motor consists of a stationary component called a stator and a rotating component called a rotor. Three-phase asynchronous motor statorStator frameIt is the exterior of the three-phase induction motor. Its main function is to support the stator core and the excitation winding.

Three phase induction motor definitionA three-phase induction motor is an asynchronous motor that operates at a different speed than a synchronous one and uses a three-phase power supply.StatorThe stator is the stationary part of the motor that receives a three-phase power supply to generate a rotating magnetic field.Major component compositionStator frameThe stator frame is the exterior of the three-phase induction motor. It supports the stator core and the field windings, providing protection