Day 3 Progress Check Flashcards
Which principle of physics is primarily responsible for the operation of electric motors?
Electromagnetism
In which type of motor is high torque at low RPM most critical, making it ideal for use in starter motors?
Series motor
Why are limit switches critical in actuator motors for landing gear and flaps?
They prevent the motor from running beyond its mechanical limits
Which type of braking method is used in motors where overrun can create excessive stress in connected components?
Dynamic braking
What is dynamic braking in the context of electric motors?
Short-circuiting the motor leads to create a load that stops the motor
How does a motor clutch protect the motor during power disconnection?
It disengages the motor, allowing it to wind down freely
What is the purpose of a commutator in a DC motor?
To maintain torque by controlling the direction of current
How is the speed of a DC motor typically controlled?
By controlling the amount of current in the armature
What happens when a motor designed for intermittent duty is operated continuously?
The motor may overheat and fail
What is the primary function of an electric motor in an aircraft?
To convert electrical energy into mechanical energy
What is the role of thermal protection in a DC motor?
To automatically shut off the motor if it overheats
What is a primary advantage of motors with permanent magnets over those with field windings?
They save space and weight
Which type of motor would be most appropriate for applications requiring constant speed, such as in blowers or fuel pumps?
Shunt motor
What is the purpose of reversing the polarity of input wires in motors with permanent magnets?
To reverse the direction of the motor
Why is torque maximized when the motion is at 90 degrees to the magnetic field lines?
The magnetic force is strongest at this angle
