Cranking System Fundamentals and Motor Drives Flashcards
What types of insulating materials are used in cranking motors?
Insulating varnish
Mica
Bakelite
Plastic
The cranking motor consists of?
A housing, set of stationary field coils, rotating armature, commutator, end frames, solenoid operated shift mechanism
The laminated armature core helps to reduce what?
Magnetic field interference and heat generating eddy currents
Cranking motor bushings are?
Made of sintered bronze that are lubricated by oil saturated wicks.
What are the 4 ways that motor field windings can be wound?
Series
Parallel
Series-parallel
Shunt
24-volt equipment battery systems usually consist of?
large 12V batteries (or battery sets) connected in series to form battery groups
T/F The pole shoes are firmly mounted inside of the motor housing, while the field coils are allowed to float and position themselves?
False. Both are mounted securely to the housing
All equipment cranking motors have the armature windings electrically connected in ____ with the field windings?
Series
The two main armature electrical components that are connected to the armature shaft are the?
Armature windings and commutator
All of the insulating material will lose it insulating qualities if it is?
Overheated
The electrical connection between the brush and the brush holder is made by a flexible copper conductor called?
A brush lead
The cranking motor has a _____ _________ _____ that is created by the flow of current through the field windings
Stationary magnetic field
The field windings are held in place by?
The pole shoes
What is the purpose of the brake washer?
To slow down and stop the armature assembly after the engine is started and the drive mechanism is disengaged
What are the 3 types of clutches in a electronic starter motor?
Over-running clutch
Sprag clutch
Posi-tork drive
