Motors And Controllers Flashcards
What are the four main parts of a split phase motor?
Rotor, stator, end plates, and centrifugal switch.
What 3 parts does the rotor consist of?
Core, shaft, squirrel caged winding
The core is made up of what?
Sheet steel called laminations
What’s is the stator made up off? (Split phase motor)
Laminated iron core with semi closed slots
Steel frame
Two windings of insulated copper called the running and starting windings.
What purpose do end bells have?
Serve to keep the rotor in perfect alignment.
Sleeve or ball bearings support the weight of the rotor and thus permit it to rotate without rubbing on the stator. True or false?
True
Where is the centrifugal switch located?
Inside the motor on one of the end bells.
When will the centrifugal switch disconnect the starting winding?
When it has reached a predetermined speed, usually 75 percent of the full load speed.
What does preventive maintenance mean?
Taking care of the trouble before it happens.
Should the rotor have more than 1/64-inch end play, place fiber washers on the shaft to line the rotor up properly. True or false?
True
How much amperage does the transformer of the tool tester pass through the tool cord equipment ground?
30
What are the four main parts of a split phase motor?
Rotor, stator, end plates, and centrifugal switch.
What 3 parts does the rotor consist of?
Core, shaft, squirrel caged winding
The core is made up of what?
Sheet steel called laminations
What’s is the stator made up off? (Split phase motor)
Laminated iron core with semi closed slots
Steel frame
Two windings of insulated copper called the running and starting windings.
What purpose do end bells have?
Serve to keep the rotor in perfect alignment.
Sleeve or ball bearings support the weight of the rotor and thus permit it to rotate without rubbing on the stator. True or false?
True
Where is the centrifugal switch located?
Inside the motor on one of the end bells.
When will the centrifugal switch disconnect the starting winding?
When it has reached a predetermined speed, usually 75 percent of the full load speed.
What does preventive maintenance mean?
Taking care of the trouble before it happens.
Should the rotor have more than 1/64-inch end play, place fiber washers on the shaft to line the rotor up properly. True or false?
True
How much amperage does the transformer of the tool tester pass through the tool cord equipment ground?
30
What is the difference between a split phase motor and a capacitor motor?
The capacitor motor has a additional unit, called a capacitor
What does the capacitor act as?
A storage unit
What kind of capacitor is used for in fractional horsepower motors?
Paper capacitor
The difference between a split phase motor and capacitor motor?
The capacitor motor provides a higher starting torque with a lower starting current than a split phase motor.
If the capacitor in the motor has been defective due to moisture, overheating or another condition, how do you repair?
You replace the capacitor with the same value of capacity.
What kind of power does a universal motor operate on?
Either single phase AC or DC power
The salient-pole type is the most common type of __________ motor.
Universal
What does a salient- pole type motor consist of?
Stator with two concentrated field windings, a wound rotor, A commutator, and brushes.
The shaded pole motor is a single phase induction motor that uses its own method to produce starting torque. True or false
True
All single phase induction motors need what to provide the motor with starting torque.
Auxiliary means
How can you control the speed of a shaded pole motor? (Fan)
The speed of these motors is varied by inserting a choke cool in series with the main winding. Taps on the choke cool provide different speeds
What parts does a three phase motor made of?
Stator, rotor, and end bells
Generators convert mechanical motion into electrical energy using what principal?
Magnetic induction
Wye connection is joined together by ____________ the windings.
Paralleling
A delta connection is one in which the end of each phase is connected in _______ with the next phase.
Series
How do you connect high voltage wye connection?
Connect T6 and T9
Connect T4 and T7
Connect T5 and T8
Connect T1, T2 and T3 to the three phase lines
How do you connect low voltage wye connection?
Connect t7 to T1
Connect T8 to T2
Connect T9 to T3
Connect T4, T5, and T6 together
The term controller includes what?
Any switch or device normally used to start or stop a motor
Controllers are classified as either magnetic or manual. True or false?
True
