DC MACHINES BY, K.KASTHURI, EEE, JCET.
Jan29 ppt1
Aug 19, 2014
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
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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.
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