ACES (MOD 3) Flashcards
The fundamental principle behind DC generation is
Electromagnetic induction
Who discovered electromagnetic induction
Michael Faraday
In electromagnetic induction when a conductor moves through a magnetic field what is being induced
Voltage (Electromotive force)
The magnitude of this induced EMF depends on the
rate of change of magnetic flux
The stationary part of the machine that provides a magnetic field. This field is usually produced by electromagnets or permanent magnets.
Stator
The rotating part where the EMF is induced. It consists of windings placed in slots.
Rotor (Armature)
A mechanical rectifier that converts the AC induced in the armature into DC by reversing the direction of current in the windings.
Commutator
Commutator is consists of
Split rings
Stationary components that maintain electrical contact with the rotating commutator.
Brushes
Electromagnetic coils in the stator to create the magnetic field.
Field windings
is the total amount of magnetic field lines that pass through a
surface. It can also be described as the amount of magnetic induction produced by a magnetic source
Magnetic flux
Working of a DC generator
- Magnetic field creation
- Relative motion
- Induction of EMF
- Rectification
- Output
two key aspects to Faraday’s Law
- magnitude of induced EMF
- Direction of induced EMF
In Lenz’s law what happens if you increase the magnetic field
New magnetic field will opposed the original magnetic field
In Lenz’s law what happens if you decrease the magnetic field
The new magnetic field will reinforce the original magnetic field
In Fleming’s right hand rule what does the following signify:
- Thumb
- Index
- Middle
Thumb: motion
Index: magnetic field
Middle: induced current
