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• What is a motor Converts electrical energyinto kinetic energy• How it works

Motor Basics

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onstruction•

Stator consists of stacked steellaminations with windings placed in the slots that are axially cut along theinner periphery

• Rotor is made of permanent magnet and can varyfrom two to eight pole pairs with alternate orth ! "and #outh !#" poles$%errite magnets and &are earth alloy magnets are

used in rotor

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like a 'rushed DC motor, the commutationa BLDC motor is controlled electronically$

s important to know the rotor position in ordunderstand which winding will 'e energi(ed

owing the energi(ing se)uence$

tor position is sensed 'y di*erent ways som

hem areall sensorsptical encoders

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R-$E S#EED CH/R/C'ER%S'%CS

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/(vantages• %ncrease( Relia0ility 1 E2ciency

• !onger !i&e

•

Elimination o& Sparks &rom Commutator• Re(uce( 3riction

• 3aster Rate o& 4oltage 1 Current

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/pplications

Consumer6 Har( Drives7CD D4D Drives7 #CCooling 3ans7 toys7 RCairplanes7 aircon(itioners

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Me(ical6 /rti*cial heart7Microscopes7centri&uges7 /rthroscopicsurgical tools7 Dentalsurgical tools an( ,rgantransport pump system $

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ehicles6 electronic power steering7 personal electric vehicles

/irplanes6 an electric sel&launching sailplane7 8ies with a9:kW DC DC 0rushless motor

an( !i;%on 0atteries an( canclim0 up to <===m with &ullycharge( cells

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losing thoughts

5iven the existing availa'ility andrstcostpenalty, BLDC technology will ndgreatest acceptance wherever its

performanceadvantage over a wide speed rangecan 'e com'ined with its excellentvaria'le6speed capa'ilities$ we canexpect this com'ination toyield an e7ciency improvement of atleast48 percent over single6speed ACinduction motors

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