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ELECTRICAL POWER AC MOTOR & DC MOTOR. AC MOTOR a. Front Covere. Back Coveri. Ball Bearings b. Stator Coilf. Fan j. Shaft c. Statorg. Frame d. Terminal.

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Presentation on theme: "ELECTRICAL POWER AC MOTOR & DC MOTOR. AC MOTOR a. Front Covere. Back Coveri. Ball Bearings b. Stator Coilf. Fan j. Shaft c. Statorg. Frame d. Terminal."— Presentation transcript:

1 ELECTRICAL POWER AC MOTOR & DC MOTOR

2 AC MOTOR a. Front Covere. Back Coveri. Ball Bearings b. Stator Coilf. Fan j. Shaft c. Statorg. Frame d. Terminal Boxh. Squirrel Cage Armature

3 BASIC PART OF AC MOTOR STATOR  The function is to supply rotational magnetic field to the rotor.  The magnetic field is produced by 2 types of winding:- Starter windings – to determine the direction or rotation of the motor Running winding – to determine the speed of the rotation.  Both windings are connected in parallel to the supply source  The size and number of windings depends on the use of the motor.

4 BASIC PART OF AC MOTOR ROTOR  The rotor does not have any winding  The rotor of an AC induction motor is cylindrical as shown in Figure (a)  made of copper or aluminium bars arranged to form a squirrel case. The ends of the bars are soldered together to a ring as shown in Figure (b) The bars allow induced current to flow in the rotor due to the changing magnetic field in the stator.  The core of the rotor is made of laminated iron sheets as shown in Figure (c)

5 OPERATION OF A SINGLE PHASE INDUCTION MOTOR  The basic operation for a single phase induction motor is to generate a rotating magnetic field.  The magnetic field is generated by generating two currents of different phase angle. These currents have 90̊ phase shift.  To produce a rotating magnetic field, the running winding and the starter windings are wound to two pairs of poles in the starter as shown in Figure (a).

6  In reference to Figure (b), the main current, It will be divided into the starter current, IS and running current, IR.  The difference in the wire size and in the number of windings for construction of the windings will produce a phase difference between the currents in each winding.  The combination of these two currents will cause the stator to generate a rotating magnetic field in the stator and magnetic field of the rotor will cause the rotor to rotate.

7 TORQUE GENERATION  The AC power supply supplies the magnetic field to the stator.  From the starter winding and the running winding, a rotating magnetic field is generated at the stator.  When current starts to flow in the rotor conductor bars, a magnetic field is generated by the rotor.  The interaction between the magnetic fields of the stator and the rotor will generate a torque in the rotor conductor bars.  This torque produces the rotation of the motor.

8 TORQUE GENERATION  The AC power supply supplies the magnetic field to the stator.  From the starter winding and the running winding, a rotating magnetic field is generated at the stator.  When current starts to flow in the rotor conductor bars, a magnetic field is generated by the rotor.  The interaction between the magnetic fields of the stator and the rotor will generate a torque in the rotor conductor bars.  This torque produces the rotation of the motor.

9 ANY QUESTIONS? THANK YOU


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