Section 1
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AC Generator
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Last updated
7 years ago
Date created
Mar 1, 2020
Cards (99)
Section 1
(50 cards)
AC Generator
Produces alternation current, 1 complete turn of armature = 1 cycle of current (Slip rings)
Three Phase 12 pulse (%)
4-10% ripple
Ferromagnetic material
A material that is strongly attracted to a magnet, and which can be made into a magnet. High permeability (iron, cobalt, nickel)
Electromagnetism
A magnetic field that surrounds any current carrying conductor.
Stator (AC Induction motor)
Even number of electromagnets around periphery of motor. Spins the rotor from outside X-ray tube.
Step Down transformer
A transformer that decreases voltage and increases amps. Used to increase amperage to filament for thermionic emission.
Magnetic Retentivity
The ability of a material to stay magnetized.
Step Up transformer
A transformer that increases voltage and decreases amps. Used to created high kv for x-rays
Diamagnetic material
A material whose atoms have no net magnetic field because of paired electrons and weakly repel magnets. (beryllium, lead, bismuth)
Generator
Converts mechanical energy to electrical energy.
Electromagnetic induction
Whenever a conductor cuts across flux lines, current is produced in the conductor.
Artificial magnet
A magnetic substance that does not occur naturally. Ex. Alnico
Rectification
Coverts AC to DC
Natural magnet
A mineral made magnetic by Earth's magnetic field. Ex. Earth and lodestone
DC Motor
Runs on DC
Slip Ring (motor)
Allows transmission of power and electrical signals form stationary to rotating structure.
Magnetic lines of force travel south to north ______ the magnet and north to south ______ the magnet.
inside, outside
What does the slip rings (AC) and commutator rings (DC) do?
Connects the solenoid to external circuit.
Paramagnetic material
A material whose atoms have a net magnetic field because of unpaired electrons, weak magnets. Low permeability (platinum, aluminum)
US and Europe Frequency of current
US = 60 cycles/ sec and Europe= 50 cycles/ sec
Magnetic domain
A magnetic atoms, caused by spinning electrons and breaking a magnet, resulting in 2
3 Laws of magnetism
1. like poles repel, unlike poles attract. 2. The force between 2 agents is directly proportional to the product and inversely proportional to the distance between. 3. Every magnet has a north and South Pole.
Three Phase 6 pulse (%)
13-25% ripple
Helix
Coiled wire
Magnetic induction
Process by which a material can be made into a magnet. Lining up magnetic domains by stroking, heating, or hammering.
Transformers
Operate on the principle of mutual induction. Change low voltage to high or high to low.
Half wave vs Full wave impulses
Half wave = 60 impulses Full wave = 120 impulses
Nonmagnetic material
Is not attracted/ repelled by a magnet (wood, glass, rubber)
When a current carrying conductor lies within a magnetic field, what happens?
there is a force on the conductor pushing it out of the magnetic filed.
Moving Coil Galvanometer
Measures DC. Connected in series- ammeter.
Soft Iron vs Hard steel
Soft iron: High permeability, low retentivity. Hard steel: Low permeability, high retentivity.
Magnetic permeability
The ease at which a material can be magnetized.
Electrodynamometer
Measures AC. Instrument for measuring electrical current by indicating the strength of repulsion/ attraction between magnetic fields.
Commutator Ring (motor)
Applies electric current and keeps motor from reversing direction.
Motors
Converts electrical energy into mechanical energy.
Magnetism
The attraction of certain metals
Magnetic field
The area of influence around a magnet
Solenoid
Helix carrying current- becomes a magnet
Principle of Operation
whenever a current carrying conductor lies w/in a magnetic field there is a force or side- thrust on the conductor forcing it out of the field.
Timers and clocks (AC motor)
Control when the motor turns off and on (mAs timers & AEC timers)
Components of a generator
Magnetic field, solenoid on an armature, source of mechanical energy.
Capacitor
An electrical device used to store electrical charge and discharge all at once.
Autotransformer
Varies the current going to the step up transformer.
Rotor (AC Induction motor)
Hollow copper cylinder around an iron core attached to anode disk. Inside the X-ray tube
DC Generator
Produces pulsating direct current, 1 complete turn of armature = 2 pulses of current (commutator ring)
AC synchronous Motor
Runs on AC in synch with current that supplies it
Electromagnet
Temporary magnets caused by electricity.
Single Phase Fully Rectified (%)
100% ripple
Flux lines
Represent the magnetic field
Electromagnet
Solenoid with iron core- stronger magnet
Section 2
(49 cards)