On Thu, Jul 26, 2018 at 5:28 PM, Chuck Guzis via cctalk <[email protected]> wrote: > On 07/26/2018 08:26 AM, Tony Duell wrote: > >> I believe if you want to be pedantic that a motor-generator set is a motor >> (with an armature/rotor and a field/stator) mechanically coupled to a >> generator (with its own armature/rotor and field/stator) whereas a >> dynamotor has a common field/stator (and possibly both armature >> windings have to be wound on the same core). > > Hence my term "unitized", which I thought to give the basic idea without > going into excessive detail on an obsolete device.
This is classiccmp. We 'do' obsolete devices here :-) > > In connection with similar low-power high-voltage supplies, I could also > have mentioned vibrator-transformer supplies, run from DC battery, used > very often in lower-power tube gear, such as auto radios and even photo > strobe flash. Indeed. I've never seen a photoflash using such a supply, but I have read about them. One day I'll add one to my collection. They were commonly used in car radios over here too. > > The high-voltage DC was obtained from the transformer secondary by > either a traditional tube (very often cold cathode gas) rectifier, later 0Z4 IiIRC wa a common rectifier valve. > solid-state (selenium or silicon) or an additional set of contacts on > the vibrator itself. Notorious for kicking up all sorts of RF noise. The latter was known as a 'synchronous vibrator' (at least over here) as the 2 sets of contacts were synchronised to (a) apply a pulse to one end of the primary winding and (b) select the appropriate end of the secondary which will have an high voltage pulse of the correct polarity. A mad friend of mine commented that a google search for a spare part for his car radio directed him to an awful lot of 'adult' sites... -tony
