Induction motor starters ppt

StartIng of SlIP rIng InductIon motor In . For squirrel-cage motors - Direct-on -line starting - Star-delta starting . For slip-ring motors- rotor resistance starting. Thus, a starter is needed in order to limit the starting current. To limit the starting current surge , large induction motors are started at reduced voltage and .

Major disadvantage is the high in-rush current.

Large voltage drops occur, dimming lights and forcing computers off-line.

Changing the number of stator poles. A 460V, 25hp, 60Hz, 4-pole, Y-connected wound rotor induction motor has the following impedances in ohms per-phase referred to the stator circuit: R= 0. What is the max torque of this motor? At what speed and slip does it occur?

Methods of Starting Three Phase Induction Motors. Squirrel cage Induction Motor :- Most of the application of industrial as well as domestic are this type of induction motor. Its construction is simple and rugged.

Cheap copare to slipring IM Maintainance is easy Cost is less compare to slipring IM Can use at explosive area Starting torque is low . Approximately 2- 2 of its full-load torque. A squirrel cage induction motor takes . Electrical Effect The electrical impact of large starting current can be serve enough to cause.

Phase induction motor -Not self starting , poor power factor, efficiency. About 1 of these are ac motor. PowerPoint Presentation Last modified by: Induction Motor Seminar PPT , PDF Report: Introduction, Why induction motor , Classification, Principle of operation, Spee Transformers, Disadvantages.

They are insulated from each other (this reduces Eddy currents) making up the stator The difference between induction and synchronous motors is that the rotor for an induction motor . Unlike in DC motors, large current at starting is due to the absence of back emf.

If an induction motor is directly . At the instant of starting 3-phase induction motor . This section is devoted to starting and braking systems and the protection of asynchronous motors of all types. Technology , starting and speed control are mentioned briefly. Please refer to the relevant sections . Direct-On-Line (D.O.L. ), Star-Delta, and Auto-transformer induction motor starting method in terms of power quality.

The purpose of this research is to find out the most reliable and practical starting method which has the less power quality problems.