Motors Flashcards
What is the purpose of an electric motor?
To convert electrical energy to mechanical energy.
What is an electrical motor similar to?
Generator
What determines the required size of starter motor?
Size of engine
What is dependant upon the current and voltage in an electric motor?
Torque
Electrical motors can be Ac or Dc/just Dc/justAc
Ac or dc
What can cause motor damage?
Motor runaway
What is the rotating part of the electric motor?
Rotor
What is the stationary part of an electric motor called?
Stator.
If something is synchronous what does it mean?
Rotates at same input frequency
If something is asynchronous what does this mean
Rotates out at same frequency
How do you calculate torque?
Voltage x current / RPM
What does a series wound give on a starter motor?
High starting torque
What can a shunt wound not start under?
Load
What wound is used in modern aircraft?
Compound wound
What is a motor fuse?a
A fuse that can withstand a higher current due to high current on start up
What can occur in a rotor seizure?
Overheating due to the motor trying to keep up with rpm
Which of the following statements are correct regarding DC electric motors?
- If a motor seizes, then the the applied EMF is equal to the back EMF
- If a motor seizes, then the applied EMF is equal to the net EMF
- If there is a motor runaway, the applied EMF is equal to the back EMF
- If there is a motor runaway, the back EMF is equal to the net EMF
2,3
In the event of an AC generator fault, on a twin engine aircraft, the protection device will open…
the exciter control relay and the generator breaker.
The pilot detectes a low oil pressure in the Integrated Drive Generator (IDG). The pilot…
Operate the IDG disconnect switch
