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

What are AC Series Motor?Ac series motor definitionThe AC series motor is an improved version of the DC series motor, suitable for operation under alternating current (AC).Modify requirementNecessary modifications include reducing eddy currents and increasing the power factor to improve the performance of AC power supplies.Compensation winding typeConduction compensated motorThe conductive compensation motor is characterized by a compensation winding in series with the armature, which is located

What is Induction Motor Maintenance ?Induction motor maintenance definitionInduction motor maintenance involves operations that increase the life of the equipment and help it operate more efficiently.Maintenance types of induction motorsSquirrel cage induction motors: Squirrel cage induction motors require much less maintenance because they do not contain brushes, commutators, or slip rings.Coil rotor induction motor: Because it contains slip rings, brushes, so it does need to be maintained from

What is the Schrage Motor Operation Principle?Schrage Motor DefinitionA Schrage motor is defined as a combination of a wound rotor induction motor and a frequency converter with primary, secondary, and tertiary windings.Operation PrincipleAt standstill, three-phase currents in the primary winding produce a rotating field. This rotating field cuts the secondary winding at synchronous speed (ns).Therefore according to Lenz’s law the rotor will rotate in a direction so as to oppose the cause i.e. t

What are Crawling and Cogging of Induction Motor?Induction Motor PhenomenaCrawling and cogging are important characteristics to understand in the operation of squirrel cage induction motors.Crawling DefinitionThis is when an induction motor runs at much lower speeds than its designed speed, primarily caused by harmonics like the 5th and 7th producing additional torque.Cogging in Induction MotorOccurs when the motor fails to start because the slots of the stator lock up with the rotor slots, ofte

What is a Roter Fed Induction Motor?Inverted Induction Motor DefinitionAn inverted induction motor is defined as a motor where the rotor has a three-phase winding that receives power supply, creating mechanical revolving characteristics in both the stator and rotor.Connection SetupThe stator and rotor both have three-phase windings, with the rotor winding in a star configuration connected to slip rings.Operational PrincipleWhen the rotor and stator windings are fed with a three-phase supply at t

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 Blocked Rotor Test of Induction Motor?Blocked Rotor Test DefinitionThe blocked rotor test of an induction motor is defined as a test to find the leakage impedance and other performance parameters.Purpose of Blocked Rotor TestIt determines torque, motor characteristics, and short-circuit current at normal voltage.Testing ProcedureDuring the test, the rotor is blocked, and low voltage is applied to the stator to measure voltage, power, and current.Effect on ImpedanceRotor position, frequen

What is No Load Test of Induction Motor?No Load Test of Induction Motor DefinitionA no load test of induction motor is defined as a test conducted when the rotor rotates at synchronous speed without any load torque.Purpose of No Load TestThis test helps identify no-load losses like core loss, friction loss, and windage loss.Theory of TestThe test assumes that the impedance of the magnetizing path is large, causing small current flow and the applied voltage is across the magnetizing branch.Test P

What is Testing of Induction Motor?Induction Motor DefinitionAn induction motor is defined as a type of electric motor that operates on the principle of electromagnetic induction.Basic Parameters Current Voltage Power ResistancePreliminary Tests Firstly check the components of motor No-load running current test High potential test Air-gap measurement Balancing of current Temperature rise in bearing Voltages in shaft Direction of rotation Level of noise Strength of vibration Air gap eccentricity

What is the Circle Diagram of Induction Motor ?Circle Diagram DefinitionA circle diagram is a graphical tool used to represent the performance of electrical machines like induction motors.Importance of Circle DiagramIt provides a comprehensive view of various performance parameters, unlike a phasor diagram which only shows current and voltage for a single condition.Tests for Data CollectionThe no-load and blocked rotor tests are essential for gathering data to draw the circle diagram of an induc