ACES (Mod 4) Flashcards
are electric motors that rotate by using power from a commercial AC power supply.
AC motors
Structure of an AC motor
- Flange bracket
- Stator
- Motor case
- Rotor
- Output shaft
- Ball bearing
- Lead wires
- Paint
The flange bracket, motor case, and rotor is made from what type of material
Die cast aluminum
Stator comprised of a ___ made from ___, a ___, and ___
- stator core
- electromagnetic steel plates
- polyester-coated copper coil
- insulation film
The output shaft is available in
- Round shaft type
- Pinion shaft type
The metal used in output shaft is
S45C
Round shaft type has a ___ (output power of ___ or more), while pinion shaft type undergoes ___
- Shaft flat
- 25 W 1/30 H
- precision gear finishing.
What type of coating does lead wires have
heat-resistant polyethylene coating
AC motors generate “___” and “___” inside the motor by the actions of the stator and the rotor, and obtain rotational force.
- Magnetic flux
- Induced current
the phenomenon when a magnet is moved along the surface of a metal
disk, the disk rotates to follow the magnet
Arago’s disk
The principle of Arago’s disk can be explained by
“Fleming’s Right Hand Rule” and “Fleming’s Left Hand Rule”.
indicates the direction of induced current (for generators) when a conductor is passed through lines of magnetic flux.
Fleming’s Right Hand Rule
indicates the direction of electromotive force (for motors) when a conductor is passed through lines of magnetic flux
Fleming’s Left Hand Rule
We apply these two laws to the relationship between the copper plate and the magnet in the order of the
right hand rule, then the left hand rule.
The operating principle of an AC motor can be explained by replacing ___ with the internal structure of the ___
- Arago’s disk
- AC motor
___ are a simplified model of the stator. The ___ in the center is a simplified model of the conducting rotor.
- N pole and S pole electromagnets
- closed coil
is an electric motor that uses alternating current (AC) to create mechanical energy.
Induction motor
Induction motor is also called
asynchronous motors
ideal for applications where bidirectional operation is repeated frequently.
Reversible motor
In a reversible motor by incorporating a ___ and increasing the ___, it is possible to switch the direction of motor rotation instantaneously.
- Simple brake
- Starting torque
Reversible motors incorporate a ___ at the rear of the motor
simple brake mechanism (friction brake)
The brake mechanism constantly applies pressure to the ___, which rubs against the ___
- Brake shoe
- Brake disk
ideal for applications requiring load holding, such as vertical drive
Electromagnetic brake motors
By incorporating a ___ electromagnetic brake, it is possible to hold the load when the power is turned off.
non-excitation type
