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E-3

E-3

THEORY OF OPERATION

FIGURE E.3 – ENGINE, GENERATOR ARMATURE AND FRAME, ALTERNATOR STATOR AND ROTOR

 

ON LATER MODELS

 

 

 

 

 

 

 

 

 

PROTECTION AND IDLER CIRCUITS

 

 

 

 

 

 

 

 

 

ARE ON ONE PC BOARD

 

 

 

 

 

 

 

 

 

PROTECTION

 

 

 

SELECTOR

 

 

 

 

 

RELAY

 

 

 

 

 

 

 

 

 

 

 

 

SWITCH

 

 

 

 

 

 

 

 

 

 

 

 

REED

 

 

 

 

IDLER

 

 

 

 

 

RELAY

NEGATIVE

 

 

BOARD

 

 

 

 

 

CR2

 

 

 

 

 

 

 

 

 

 

OUTPUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TERMINAL

 

 

 

 

 

 

 

 

115 & 230VAC

 

 

 

 

 

 

 

 

 

 

RECEPTACLES

 

 

 

 

IDLER

 

 

 

 

 

 

 

 

 

SOLENOID

 

 

 

 

 

 

 

 

OIL

OIL

 

 

GENERATOR

 

 

 

 

 

TEMPERATURE

PRESSURE

 

 

 

FRAME

 

 

 

 

 

SENSOR

SENSOR

 

 

 

 

 

CURRENT

 

 

FUEL

 

 

SERIES

 

 

 

 

 

 

SOLENOID

 

 

COILS

 

 

 

 

TRANSFORMER

 

 

RELAY

 

 

 

 

 

 

ALTERNATOR

STATOR

 

 

CR1

 

 

 

 

BRUSHES & COMMUTATOR

 

 

SWITCH

ENGINE

 

 

ARMATURE

 

 

SLIP

 

 

(NOT PRESENT

ENGINE

MECHANICAL

GENERATOR

 

ARMATURE

ROTOR

 

 

 

ON LATER MODELS)

 

 

 

 

 

 

 

 

 

IGNITION

 

 

COUPLING

 

 

 

SHAFT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ALTERNATOR

 

 

 

 

 

 

 

RINGS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INTERPOLE

 

 

 

 

 

 

 

 

 

COILS

RESIDUAL

 

 

 

 

 

 

STARTER

 

 

MAGNETISM

FLASHING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOTOR

 

 

FIELD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SHUNT

 

 

 

 

 

 

 

 

 

WINDINGS

 

 

 

 

 

 

 

 

 

 

 

 

FIELD

 

 

 

BATTERY

 

 

 

 

 

RECTIFIER

 

 

 

 

 

 

 

GENERATOR

 

 

 

 

 

 

 

 

 

FIELD CONTROL

 

 

POSITIVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT

 

 

 

 

 

 

 

 

 

 

TERMINAL

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ENGINE, GENERATOR ARMATURE AND FRAME, ALTERNATOR STATOR AND ROTOR

EXCITATION (FLASHING)

When the engine is started and running, the residual magnetism voltage is applied to the alternator rotor via a brush and slip ring configuration. This excitation (“flashing”) voltage magnetizes the rotor lamination. The alternator rotor is connected to the armature shaft, which is mechanically coupled to the engine. The rotat- ing magnet (rotor) induces a voltage in the stationary windings of the alternator stator.

AUXILIARY AND FIELD FEEDBACK COILS

There are two isolated windings incorporated in the sta- tor lamination assembly. One of these windings is tapped and provides 115VAC and 230VAC of auxiliary power to the appropriate receptacles. The other 115VAC isolated winding is rectified to a DC voltage and is used to supply field feedback voltage to the

rotor. It also supplies voltage, through the generator field rheostat control, to the field shunt windings in the main generator frame.

INTERPOLE AND SERIES COILS

The generator armature rotates within the magnetic field created by the shunt field windings. A DC voltage is induced in the armature and is transferred, through the armature commutator and brushes, to the series and interpole coils. The interpole coils, which are con- nected in series with the positive output terminal, are located so as to counteract any magnetic influences that could cause mechanical distortion in the rotating armature. The series coils are designed to oppose or “buck” the DC voltage that is generated in the arma- ture.

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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.

CLASSIC II

Page 47
Image 47
Lincoln Electric SVM125-A Excitation Flashing, Auxiliary and Field Feedback Coils, Interpole and Series Coils

SVM125-A specifications

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