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Starter BasicsStarter Basics
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Motor PrinciplesMotor Principles DC motors interaction of magnetic fields DC motors interaction of magnetic fields
to convert electrical energy to to convert electrical energy to mechanical energymechanical energy
Current is applied to field and armatureCurrent is applied to field and armature Conductor tends to move from weak Conductor tends to move from weak
magnetic field to strong magnetic field.magnetic field to strong magnetic field. For armature to continue rotating, the For armature to continue rotating, the
current flow must be reversed.current flow must be reversed.
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Conductor CurrentConductor Current Conductor has Conductor has
magnetic flux magnetic flux lines around it lines around it
Opposes north Opposes north and south fields and south fields which causes which causes loop of wire to loop of wire to turn.turn.
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MagnetMagnet Has north and Has north and
south pole.south pole. Magnetic lines of Magnetic lines of
force move from force move from north to south north to south pole.pole.
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Conductor in Conductor in Magnetic FieldMagnetic Field
As current As current travels through travels through conductor and conductor and fields, conductor fields, conductor moves.moves.
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Flux lines Flux lines always tend always tend to want to to want to be straightbe straight
Fields act Fields act on each on each otherother
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ROTATION OF CONDUCTOR ROTATION OF CONDUCTOR IS IN DIRECTION OF IS IN DIRECTION OF WEAKER FIELD.WEAKER FIELD.
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Electromagnetic MotorElectromagnetic Motor
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Made of Laminated CoreMade of Laminated Core Solid Steel ShaftSolid Steel Shaft CommutatorCommutator Lap and Wave WoundLap and Wave Wound
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Stationary Field WindingsStationary Field Windings
Iron Core & Windings concentrate magnetic fieldIron Core & Windings concentrate magnetic field Fields have north and south pole based on Fields have north and south pole based on
direction windings are wound around pole shoesdirection windings are wound around pole shoes
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3 Methods of Connecting 3 Methods of Connecting FieldsFields Series WoundSeries Wound
Maximum torque Maximum torque when startswhen starts
Shunt WoundShunt Wound Used in smaller Used in smaller
motorsmotors Compound Compound
WoundWound Constant speedConstant speed
Page C143
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The The powerpower is in the size of the windings, the size of the is in the size of the windings, the size of the windings, the number of turns and how its woundwindings, the number of turns and how its wound
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PERMANENT MAGNET PERMANENT MAGNET STARTER MOTORSTARTER MOTOR Has no field circuitHas no field circuit Very light weightVery light weight Usually gear reduction starter motorsUsually gear reduction starter motors Fairly fragileFairly fragile Permanent magnets are stronger than Permanent magnets are stronger than
typical permanent motors (Made of typical permanent motors (Made of boron, neodymium and iron)boron, neodymium and iron)
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ANDAND THATS ALL!!THATS ALL!!