generators Flashcards
what do generators do
supply the energy used to create x-rays
why is AC bad for x-ray production
only half is used, so exposures take twice as long
what do rectifiers do
convert AC to DC
only allow currents through in one direction
what are the 5 generator classifications
half wave
full wave
three phase, six pulse
three pulse, twelve pulse
high frequency
what is the formula for generator rating
generator rating (kW) = kVp x mA / 1000
what is the generator rating
the maximum power of the generator
(usually max mA can support at 100kVp for 100ms)
what is the frequency of single phase generators
60Hz
how are 3-phase generators different from single phase
they rotate 3 armatures
or a magnet surrounded by 3 coils
creating 3 separate waveforms
how many rectifiers are used for 3-phase, 6 pulse
what type of rectifiers
6
2 forward bias
4 reverse bias
what is a delta connection
each coil is connected to each other at one end
what are the pros and cons of a delta connection
high power and torque
prone to distortion and overheating
what is a star connection
each coil is connected to a common neutral wire, and each other
what are the pros and cons of a star connection
less power and torque
less distortion and overheating
what is the frequency range for high frequency generators
0.5-25 kHz
what are the benefits of a high frequency generator
small size, very efficient
better beam quality
higher tube ratings
