leitmotif
Member
In every class I have attended regarding DC motors the litany goes
series motors high torque poor speed control
Shunt motors lower torque but better speed control
Compound a compromise of preceding two. Then they say short shunt and long shunt.
I have never had the experience of working in a motor shop which as time goes on looks to be a mistake. I am sure I would have more knowledge if I had torn em down rewound and been able to test them.
Recently I have come across new terms stabilyzed shunt and compensated shunt.
I found a previous posting
http://www.plctalk.net/qanda/showthread.php?t=28274
Quoting from it (thank you Dick DV)
"stab shunt motor has less series field and the comp shunt has more"
To summarize and check my understanding:
There are basically two types of compound motors
stabilyzed and compensated shunt.
as Dick said
stabilyzed has smaller series field therefore probably better speed control and regulation (less speed droop more proper?)
Compensated has more series giving more torque and not as good speed control.
THEN both could be either long shunt or short shunt? OR shunt could be supplied by separate source ie sepex.
How come this is not stamped on the nameplate - I have never seen anything more than compound.
So here I am with an old DC compound motor how do I tell if it is stabalized or compensated? If I had the manual I would read it of course but,,, the motor is so old I can find no information on it. It is actually a military aircraft ground support generator made by Jack & Heinz who are no longer in business. All I have coming out of motor is two big terminals (armature) and two small ones for shunt field. It does have commutation windings and does run well. Rated for 30VDC and 400 amp.
I have the motor book written by Rosenberg - I like it a bunch great book for troubleshooting (told me how to find out shunt field correctly connected on compound motor) but maybe a little short on theory. Anybody able to recommend a good DC motor theory book that does not immediately dive into calculus?
Thanks for help
Dan Bentler
series motors high torque poor speed control
Shunt motors lower torque but better speed control
Compound a compromise of preceding two. Then they say short shunt and long shunt.
I have never had the experience of working in a motor shop which as time goes on looks to be a mistake. I am sure I would have more knowledge if I had torn em down rewound and been able to test them.
Recently I have come across new terms stabilyzed shunt and compensated shunt.
I found a previous posting
http://www.plctalk.net/qanda/showthread.php?t=28274
Quoting from it (thank you Dick DV)
"stab shunt motor has less series field and the comp shunt has more"
To summarize and check my understanding:
There are basically two types of compound motors
stabilyzed and compensated shunt.
as Dick said
stabilyzed has smaller series field therefore probably better speed control and regulation (less speed droop more proper?)
Compensated has more series giving more torque and not as good speed control.
THEN both could be either long shunt or short shunt? OR shunt could be supplied by separate source ie sepex.
How come this is not stamped on the nameplate - I have never seen anything more than compound.
So here I am with an old DC compound motor how do I tell if it is stabalized or compensated? If I had the manual I would read it of course but,,, the motor is so old I can find no information on it. It is actually a military aircraft ground support generator made by Jack & Heinz who are no longer in business. All I have coming out of motor is two big terminals (armature) and two small ones for shunt field. It does have commutation windings and does run well. Rated for 30VDC and 400 amp.
I have the motor book written by Rosenberg - I like it a bunch great book for troubleshooting (told me how to find out shunt field correctly connected on compound motor) but maybe a little short on theory. Anybody able to recommend a good DC motor theory book that does not immediately dive into calculus?
Thanks for help
Dan Bentler
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