3 phase of induction motor 2015 16
TRANSCRIPT
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ESHAN COLLEGE OF ENGINEERING FARAH, MATHURA
SEMINAR PRESENTATION
ON 3-PHASE INDUCTION MOTOR
Submitted to-: Submitted by-: Er.Mayank jain Pawan kumar B.Tech EE(3rd Year) Roll no.1347120006
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Contents• Introduction• Construction• Parts of induction motor• Rotor construction• Rotating magnetic field(RMF)• Principle of operation• Equivalent circuit• Power losses• Power flow in induction motor• Torque speed characteristics• Speed control• Advantage• Application.
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Introduction
• Induction Motors transform electrical energy into mechanical energy. – simple design, Cheap,robust, low-price, easy
maintenance.– wide range of power ratings: fraction
horsepower to 10 MW – run essentially as constant speed from no-load
to full load.– Its speed depends on the frequency of the
power source.
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Construction
• The three basic parts of an Induction motor are the rotor, stator, and enclosure.
• The stator and the rotor are electrical circuits that perform as electromagnets.
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Parts of induction motor
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Rotor construction
• The rotor is the rotating part of the electromagnetic circuit.
• It can be found in two types:– Squirrel cage–Wound rotor
• However, the most common type of rotor is the “squirrel cage” rotor.
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Fig.1.Squirrel cage rotor Fig.2.Wound rotor
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Rotating magnetic field
• When a 3 phase stator winding is connected to a 3 phase voltage supply, 3 phase current will flow in the windings, which also will induced 3 phase flux in the stator.
• These flux will rotate at a speed called a synchronous speed, ns. The flux is called as rotating magnetic field
• Synchronous speed: speed of rotating flux
pfns
120
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Principle of operation
• When a 3 phase stator winding is connected to a 3 phase voltage supply, 3 phase current will flow in the windings, hence the stator is energized.
• A rotating flux φ is produced in the air gap. The flux Φ induces a voltage ea in the rotor winding (like a transformer).
• The induced voltage produces rotor current, if rotor circuit is closed.
• The rotor current interacts with the flux φ, producing torque. The rotor rotates in the direction of the rotating flux.
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Equivalent Circuit
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Power losses
• Copper losses– Copper loss in the stator (PSCL) = I12R1– Copper loss in the rotor (PRCL) = I22R2
• Core loss (Pcore)• Mechanical power loss due to friction and wind age.
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Power flow in induction motor
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Torque-speed characteristics
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Speed Control
There are 3 types of speed control of 3 phase induction machines
i. Varying rotor resistance.ii. Varying supply Frequency.iii. Stator voltage control.
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Advantage
• Low cost.• High starting torque.• Maintenance easily.• Induction motor can be operated in polluted and
explosive environments.• Induction motor are simple and robust in construction.
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Application
• Water pump.• Lathe machine• Printing machine• Grinding machine.
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QUERIES ????
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