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Jan29 ppt1

Aug 19, 2014

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Engineering

this is about DC MACHINES. A DC motor is a mechanically commutated electric motor powered from direct current (DC). The stator is stationary in space by definition and therefore the current in the rotor is switched by the commutator to also be stationary in space. This is how the relative angle between the stator and rotor magnetic flux is maintained near 90 degrees, which generates the maximum torque. UPLOADED BY KASTHURI ,EEE

  • BY, K.KASTHURI, EEE, JCET.
  • DEFINITION CONSTRUCTION APPLICATIONS- main New trends in dc motor ADVANTAGES DISADVANTAGES
  • A DC MOTOR in simple words is a device that converts direct current(electrical energy) into mechanical energy. ELECTRICAL MECHANICAL
  • FARADAYS LAW OF ELECTRO MAGNETIC INDUCTION: whenever a conductor is moved within a magnetic field in such away that the conductor cuts across magnetic lines of flux, voltage is generated in the conductor To determine the direction of force acting on the armature conductors of dc motor Flemings left hand rule
  • OPERATION:- when a conductor rotates in a magnetic field, it cuts flux. Then produces force.
  • In hazardous nuclear areas. In electric hoists ,reels , winches. In industrial applications. In remote control. In power switching applications. In HVAC mobile applications. In hydraulic applications Chemical injection applications.
  • WORKHOUSE. PUMP MECH I/P PRESSURISED FLUID POWER. (ELECTRIC MOTOR) BECAUSE OF ITS, VARIABLE SPEED CONTROL FASTER RESPONSE IN TRANSIENT CONDITION.
  • In hazardous applications:
  • In hazardous applications:- Type of special construction: explosion proof. Enclosure can withstand an explosion of a gas, vapour, dust. UL,CSA,NEC(National Electrical Code) - approved.
  • DC MOTORS IN REMOTE CONTROL, SWITCHING APPLICATIONS:-
  • In remote control:- Dc motor- serve vital role as remote motor operator. TWO REMOTE CONTROL-DC MOTOR: are SWITCHES in electrical transmission & receiver . In rail track- start place endind place.
  • New trend in dc motor:-
  • New trend: BLDC(brush less Dc Motor ):-experienced rapid adoption in market place. Overcome traditional demerits. Merits: less maintenance. Less cost High operating speed Less noise Better torqe/wt ratio. High performance capability.
  • In BLDC: TREND I:- IMPLEMENT SENSORLESS MOTOR. To reduce ripple. TREND II: INTEGRATING BLDC &DRIVE ELECTRONICS INTO A SINGLE PACKAGE. minimize interconnection cables. noise reduced increase performance.
  • REFERANCES: www.electrical4u.com www.webcrawler.com www.ohioelectronics.com
  • Any queries?
  • Thank you friends. By k.kasthuri.