Ac Motors Flashcards
What Voltage AC motor cannot run in a 3 phase duty cycle?
120V
Reasons an AC motor overheats
Low or high voltages
Repeated restarts
High ambient temperatures
Blocked vent holes
A 1.15 service factor means an AC motor can take what % of overload?
115%
A 2 letter motor code indicates
1/16th increments
A 3 letter motor code indicates
1/4” inch increments
“T” means what in motor nomenclature?
Long shaft
Overloads protect what?
The motor
Fuses protect what?
Wire
A motor with a red reset button on the motor has what type of overloads?
Manual thermal overloads
A motor that starts back up when it cools down has what type of overloads?
Automatic thermal overloads
What is slip?
The difference between the synchronous speed and the actual rotor speed?
Motor parts list
The more poles a motor what rating increases?
Torque increases
The less poles a motor has the higher the?
RPM
What are the workhorses of industry?
Motors
A motor with a copper ring in the direction of roation? (Shader ring)
Shaded pole motor
A single phase motor with a separate start winding that times out after start up?
Split phase motor
The most common single phase motor used in industrial settings?
Capacitor start motor
A fractional horsepower motor most commonly used in HVAC?
Permanent split capacitor motor
A motor that bolts directly to the driven machinery
D flange
A motor with a finished face built into one end bell of the motor some times referred to as an end shield?
C-face motor
What are the 2 basic types of motors?
AC and DC
