DC MOTOR

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Information about DC MOTOR
Science-Technology

Published on April 28, 2010

Author: ravi335

Source: authorstream.com

DC MOTOR : Made by- NITIN & BALDEV DC MOTOR SUBMITTED BY: NITIN & BALDEV MECH. ENGG. 2nd year JAYPEE POLYTECHNIC & TRAINING COLLEGE ,SAMIRPUR Slide 2: Made by- NITIN & BALDEV TOPIC DISCUSS Introduction and history about DC Motor. Principle of DC Motor. Types of DC Motor. Construction of DC Motor. Working of DC Motor. Characteristics of DC Motor. Merits and demerits of DC Motor JAYPEE POLYTECHNIC & TRAINING COLLEGE ,SAMIRPUR Slide 3: Made by- NITIN & BALDEV BRIEF HISTORY OF DC MOTOR The history of DC motor can be traced back to the 1830s, when Michael faraday did extensive works with disc type of machine. JAYPEE POLYTECHNIC & TRAINING COLLEGE ,SAMIRPUR Slide 4: Made by- NITIN & BALDEV 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. JAYPEE POLYTECHNIC & TRAINING COLLEGE ,SAMIRPUR Slide 5: Made by- NITIN & BALDEV 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 (also called motor rule) It shows the field set up by the poles. It shows the conductor field due to flow of current in the conductor. JAYPEE POLYTECHNIC & TRAINING COLLEGE ,SAMIRPUR Slide 6: Made by- NITIN & BALDEV TYPES OF DC MOTOR SHUNT MOTOR. Shunt motor in which the field winding is connected in parallel with the armature JAYPEE POLYTECHNIC & TRAINING COLLEGE ,SAMIRPUR Slide 7: Made by- NITIN & BALDEV SERIES MOTOR Series motor in which the armature and field winding are connected in series JAYPEE POLYTECHNIC & TRAINING COLLEGE ,SAMIRPUR Slide 8: Made by- NITIN & BALDEV COMPOUND MOTOR Which has two field winding, one of which is connected in parallel with the armature and other in series with it. JAYPEE POLYTECHNIC & TRAINING COLLEGE ,SAMIRPUR CONSTRUCTION OF DC MOTOR : Made by- NITIN & BALDEV CONSTRUCTION OF DC MOTOR CONSTRUCTION OF DC MOTOR Field poles- the pole shoe acts as a support the field to 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 to which are fixed the main and commutating poles . Commutating poles- Commutating poles are usually made of steel. it arranged midway between main poles and bolted to the yoke. 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) JAYPEE POLYTECHNIC & TRAINING COLLEGE ,SAMIRPUR Slide 10: Made by- NITIN & BALDEV Commutator- a commutator converts alternating voltage to direct voltage. it is a cylindrical structure built up of segment made of hard drawn copper. Brushes- the use of brushes is made for machines designed for large current at low voltages. Armature winding- the winding must be designed with the most advantages utilization of the material in respect to weight and efficiency. JAYPEE POLYTECHNIC & TRAINING COLLEGE ,SAMIRPUR Slide 11: Made by- NITIN & BALDEV MERITS High starting torque . Speed control over a wide range ,both below and above normal speed. Accurate seedless speed control. Quick starting, stopping. DEMERITS High initial cost. Increased operating and maintenance costs because of the commutator and brush gear. JAYPEE POLYTECHNIC & TRAINING COLLEGE ,SAMIRPUR Slide 12: Made by- NITIN & BALDEV JAYPEE POLYTECHNIC & TRAINING COLLEGE ,SAMIRPUR When power is applied, DC motors turn in one direction at a fixed speed. They are optimized to run at a fixed, usually high RPM. Torque is highest at the rated speed and lowest at low speeds. Speed can be varied if a (pulse width modulation) PWM controller is added. Almost all can be reversed. Inexpensive and commonly available. Available in wide range of speeds and power. Suitable for turning, spinning, etc. Not suitable for positioning unless some kind of position feedback is added. If the applied load is greater than the capacity of the motor, the motor will stall and possibly burn out. DC Motor Characteristics

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