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Dc motor
 

Dc motor

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    Dc motor Dc motor Presentation Transcript

    • DC MOTOR
    • INDEX• HISTORY & INTRODUCTION OF THE DC MOTOR• CONSTRUCTION OF DC MOTOR• TYPES OF DC MOTOR• WORKING OF DC MOTOR• MERITS & DEMERITS OF DC MOTOR
    • Brief History of DC Motor• The history of DC Motor can be traced back to the 1830s,when Michael Faraday did extensive works on disc type of machine
    • INTRODUCTION OF DC MOTOR• A DC Motor is a machine which converts electrical energy into mechanical energy. It depends for its operation on the force which is known to exist on conductor carrying a current while situated in a magnetic field.
    • Construction of DC MOTOR• FIELD POLES- The pole shoe acts as a support to the field coils and spread out the flux in the air gap and reduce the reluctance of magnetic field.• FRAME- The Frame is the stationary part of a machine in which poles, and rotor are stationed.• ARMATURE- The armature consist of core and winding. It is built up of thin lamination of low loss silicon steel(0.4 to 0.5)
    • • COMMUTATOR- A commutator converts alternating voltage to direct voltage. It is a cylindrical structure built up of segment made drawn copper.• BRUSHES- The use of brushes is made for machines designed for large current at low voltage.• ARMATURE WINDING- The winding must be designated with the most advantages utilization of the material in respect to weight and efficiency
    • TYPES OF DC MOTOR• SHUNT MOTOR – Shunt Motor in which the field winding is connected in parallel with the armature
    • • SERIES MOTOR- Series Motor in which the armature and field winding are connected in series
    • • COMPOUND MOTOR- This type of motor has two field winding, one of which is c6nnected in parallel with the armature and other in series with it
    • Working Principle Of DC MOTOR• Whenever a current carrying conductor is placed in a magnetic field, it experienced a force whose direction is given by Fleming’s Left Hand Rule.• It shows the field set up by the poles• It shows the conductor field due to flow of current in the conductor
    • • MERITS • DEMERITS• High starting torque • High initial cost• Speed control over a • Increased operating and wide range, both below maintenance cost and above normal speed because of the• Accurate seedless speed commutator and brush control gear• Quick starting, stopping