DC Injection Braking - Find the patent!

Thread Starter

xylstra

Joined Jul 21, 2015
6
Simple DC Injection Braking Circuit: Please have a look at the circuit diagram attached. I am writing a technical article and wish to authoritatively quote the correct patent number for this circuit. So far my searches have eluded me. Does anyone know of it or else can provide more information as to the technique's origins (i.e. names, dates. etc). I suspect it would have to be around the 1950's or before.untitled.png
 

DickCappels

Joined Aug 21, 2008
7,829
Have you checked the prior art cited in these U.S. patents?

2,413,070 Reeves _____________ _.. Dec. 24, 1946

2,606,312 Rogers _____________ .._ Aug. 5, 1952

2,821,639 Bright et \al. _________ __ Jan. 28, 1958

1,976,562 Janisch ___________ __ Oct. 9, 1934

2,167,530 Schneider ________ __ July 25, 1939

2,264,333 Satterlee _________ __ Dec. 2, 1941
 

alfacliff

Joined Dec 13, 2013
2,458
we still had some grinders around here with tubes to time the dc injection. if that gives you any idea of how old the patent might be.
 

Glenn Holland

Joined Dec 26, 2014
705
Looks like a simple DC injection circuit for producing dynamic braking in an induction motor.

The patents on this arrangement were probably issued during the earlier days of electricity after Nicola Tesla introduced AC power.
 

Thread Starter

xylstra

Joined Jul 21, 2015
6
Have you checked the prior art cited in these U.S. patents?

2,413,070 Reeves _____________ _.. Dec. 24, 1946

2,606,312 Rogers _____________ .._ Aug. 5, 1952

2,821,639 Bright et \al. _________ __ Jan. 28, 1958

1,976,562 Janisch ___________ __ Oct. 9, 1934

2,167,530 Schneider ________ __ July 25, 1939

2,264,333 Satterlee _________ __ Dec. 2, 1941
 

Thread Starter

xylstra

Joined Jul 21, 2015
6
Hi Dick, Thanks for taking the time to reply. Unfortunately none of your quoted patents are of any use since they relate to DC motors, not AC Induction Motors. I'm still hopeful someone will deliver the goods!
 

Thread Starter

xylstra

Joined Jul 21, 2015
6
Looks like a simple DC injection circuit for producing dynamic braking in an induction motor.

The patents on this arrangement were probably issued during the earlier days of electricity after Nicola Tesla introduced AC power.
It might very well be simple, but it's actually very subtle. Think about it....!
 
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