Anonymous-0
Well-known Member
How does an "autotransformer" differ from a transformer?
- Thread starter Anonymous-0
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buickanddeere
Well-known Member
Cheaper to build per KVA. No electrical isolation between primary and secondary windings.
I agree with the other fine sparkies. A Transformer has two independant coil windings, Primary and Secondary and the turns ratio determines the voltage step up or step down. All the transformer effect is due to mutual inductive coupling as the two windings are seperate and isolated. If you just take one winding and install taps up and down you get different voltages i.e. an Autotransformer. Of course, transformer action requires a rising and collapsing magnetic field (such as an AC source) which is why pure straight DC IS NOT TRANSFORMABLE, although pulsing on and off application of DC (like when points open and close in tractor ignition) does create a rising and collapsing magnetic field so transformer action can produce HV to fire spark plugs yayyyyyyy
John T
John T
"[A]lthough pulsing on and off application of DC (like when points open and close in tractor ignition) does create a rising and collapsing magnetic field so transformer action can produce HV...."
Hence, the so-called "vibrator" used in early automotive tube type radios to generate the B+ voltage for the tubes.
Dean
Hence, the so-called "vibrator" used in early automotive tube type radios to generate the B+ voltage for the tubes.
Dean
EXACTLY it was the same operation, the vibrating (open/close) metal contactor made and broke the DC circuit which first created a magnetic field but then it collapsed when current stopped, therefore via transformer action the turns ratio was used to produce HV in the Secondary.....I have one of those old noisy humming heat producing radios in my shop....
John T
John T
Brad Buchanan
Member
Hi all,
I can understand how placing several taps on the secondary windings of a transformer to get different voltages.
However, if there is no electrical isolation between the primary and secondary windings would this not just be a direct connection between the primary and secondary coils?
Would the current not seek the most direct path to ground ie. the load and not energize the primary to create the pulsating magnetic field to energize the secondary windings?
Brad
I can understand how placing several taps on the secondary windings of a transformer to get different voltages.
However, if there is no electrical isolation between the primary and secondary windings would this not just be a direct connection between the primary and secondary coils?
Would the current not seek the most direct path to ground ie. the load and not energize the primary to create the pulsating magnetic field to energize the secondary windings?
Brad
Bead, see if this helps with visualization:
http://www.transtutors.com/Uploadfile/CMS_Images/21190_Auto-Transformer.JPG
May be many more taps such as C', C'', C''', etc.
http://www.transtutors.com/Uploadfile/CMS_Images/21190_Auto-Transformer.JPG
May be many more taps such as C', C'', C''', etc.
Tube type superhetrodyne automotive radios were good AM receivers for their day.
I well remember the "Sonomatic" radio in my Fathers 1951 Buick with the antenna mounted just above the center of the windshield and rotatable by a knob above the rear view mirros.
The radio still worked when the car was scrapped in, I believe, 1969 or 1970.
Dean
I well remember the "Sonomatic" radio in my Fathers 1951 Buick with the antenna mounted just above the center of the windshield and rotatable by a knob above the rear view mirros.
The radio still worked when the car was scrapped in, I believe, 1969 or 1970.
Dean
Brad Buchanan
Member
Ok,
I understand that. It looks like a variable resistor. Any tap will always be less than V1.
Would there be another core and coil to drive V1?
Brad
I understand that. It looks like a variable resistor. Any tap will always be less than V1.
Would there be another core and coil to drive V1?
Brad
Anonymous-0
Well-known Member
Thanks to all who responded. It's difficult to look up in the books I have. Now I know.
again, thanks
again, thanks
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