I have scanned some information from an old copy of REFERENCE DATA FOR RADIO ENGINEERS, Fifth Edition.
There are only four drawings and not much to go on, but there are enough design equations to get you started.
I don't think that magamps were ever purely dc, that is to say that the small...
Perhaps these sources will help, that is if you can find them:
AMPLIFIER HANDBOOK, Shea, McGraw Hill, 1966. Chapter 8 is "Magnetic Amplifier Devices" by Harold W. Lord. (I have this book.)
H.M. Gale and P.D. Atkinson, A Theoretical and Experimental Study of Series-connected Magnetic...
Re: the previous statement having to do with telephone cables.
Shorts to ground or to another wire in the cable was located with Loop and Varley measurements with a Wheatstone bridge. Opens are another matter.
Thinking WAY BACK, when I first started with the phone company and cable and...
The inductive reactance of a coil is direclty proportional to the frequency. XL=2 pi f L. It would seem to me that the current drawn by a 50 Hz motor, operating at the same voltage, would draw less current on 60 Hz.
Of course, the speed of the motor would be off and the horsepower output of...
I had a ham friend that used an alternator to power his mobile transmitter. He used three high current, 12 volt filement transformers, rated at 60-400 Hz. He used to joke that the engine really slowed down when he keyed the mike.
It would not be too hard to tap onto the windings before the...
A PS to the message I just sent:
Section 16 gives detailed formulae and nomograms for the calculation and design of multi-fin heat sinks. I should think that the same could be used for buss bars, too.
And not just any paint, either.
I remembered a chart I saw some years back. In the Third Edition of the GE SCR MANUAL, 1964, PAGE 280, Section 16.6, Radiation. This has do do with heat sink calculations.
Table 16.3
Material.... Emissivity
Anodized Aluminum.... 0.7-0.9
Commercial...
Mgopalan:
I think that your problem with the silicon oil is that the silicon oil breaks down during the normal arcing at the commutator. The silicon (and silicon oil vapors, too) break down and deposit silicon (glass) on the commutator. The glass deposit will build up until the proper...
