Jan29 ppt1
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Transcript of Jan29 ppt1
DC MACHINES
BY,K.KASTHURI,
EEE,JCET.
TO SEE: DEFINITION CONSTRUCTIONAPPLICATIONS- mainNew trends in dc motor ADVANTAGES DISADVANTAGES
DEFINITION:A DC MOTOR in simple words is a device that converts direct current(electrical energy) into mechanical energy.ELECTRICAL MECHANICAL
PRINCIPLE OF OPERATION:
• FARADAY’S 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 Fleming’s left hand rule
OPERATION:-when a conductor rotates in a magnetic field, it cuts flux.Then produces force.
APPLICATIONS:- 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.
HYDRAULIC BUMP APPLICATION:-
DC MOTOR-IN HYDRAULIC PUMP:- WORKHOUSE. PUMP
MECH I/P PRESSURISED FLUID POWER.(ELECTRIC MOTOR)
BECAUSE OF IT’S, 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 reducedincrease performance.
REFERANCES:
www.electrical4u.comwww.webcrawler.comwww.ohioelectronics.com
Any queries?
Thank youfriends.
By k.kasthuri.