Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

seperately excited dc motor control

Status
Not open for further replies.

engineer1000

Advanced Member level 4
Joined
Aug 16, 2012
Messages
106
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,296
Activity points
2,060
I have a littlefuse applicatin note AN1003.16 FOR TRIAC speed control for permanent dc motor. I want to control a seperately excited dc motor. 100v dc field and 90v dc armiture.
Can I use this to power the armiture and used a rectifed circuit to permanently power the field winding.?
 

srizbf

Advanced Member level 5
Joined
Apr 3, 2010
Messages
1,995
Helped
417
Reputation
840
Reaction score
328
Trophy points
1,363
Activity points
10,985
I have a littlefuse applicatin note AN1003.16 .......
Can I use this to power the armiture and used a rectifed circuit to permanently power the field winding.?

if you intend to use fig 16 of the application note ,
for connecting armature then it is feasible.

only constraint may be you have to take care that the phase control variable pot should not exceed the 90volt across the armature.
 

engineer1000

Advanced Member level 4
Joined
Aug 16, 2012
Messages
106
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,296
Activity points
2,060
if you intend to use fig 16 of the application note ,
for connecting armature then it is feasible.

only constraint may be you have to take care that the phase control variable pot should not exceed the 90volt across the armature.


That's exactly what I want to do . I was a little worried that at start up I would still get too much current through the triac due to the low armiture resistance
 

engineer1000

Advanced Member level 4
Joined
Aug 16, 2012
Messages
106
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,296
Activity points
2,060
That's exactly what I want to do . I was a little worried that at start up I would still get too much current through the triac due to the low armiture resistance
Now only have one problem. The motor changes direction using two switches conected to the field winding operated by a lever. The problem is it has a neutral position where the field winding is not connected. At this point i have the armiture powered. I need to find a way to only allow current through the armiture when the field winding is connected. Any ideas ?
 

engineer1000

Advanced Member level 4
Joined
Aug 16, 2012
Messages
106
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,296
Activity points
2,060
seperately excited dc motor control problem help

I am trying to run a seperately excited dc motor. my field winding is powered via a110vac full bridge straight on to the windings, which is fine. the armiture is powered using a full bridge and a triac on the ac side, to reduce the dc voltage , with the trigger connected to MTS VIA resistors and pot ( little fuse AN1003.16). My armiture resistance is 3.4R. The first thing I did was put a 2k2 resistor inplace of the armiture winding , When I moved the pot the voltage changed from approx 10v to 50v dc on the dc side.
When I connected it up to the armiture the triac stopped conducting. does anyone know why? the triac is a 40A device .
I have had the motor turning with the field winding powered and a power supply across the armiture winding with a voltage of 10v dc
help
 

srizbf

Advanced Member level 5
Joined
Apr 3, 2010
Messages
1,995
Helped
417
Reputation
840
Reaction score
328
Trophy points
1,363
Activity points
10,985
Re: seperately excited dc motor control problem help

I am trying to run a seperately excited dc motor. my field winding is powered via a110vac full bridge straight on to the windings, which is fine. the armiture is powered using a full bridge and a triac on the ac side, to reduce the dc voltage , with the trigger connected to MTS VIA resistors and pot ( little fuse AN1003.16). My armiture resistance is 3.4R. The first thing I did was put a 2k2 resistor inplace of the armiture winding , When I moved the pot the voltage changed from approx 10v to 50v dc on the dc side.
When I connected it up to the armiture the triac stopped conducting. does anyone know why? the triac is a 40A device .
I have had the motor turning with the field winding powered and a power supply across the armiture winding with a voltage of 10v dc
help

if you can attach the actual circuit you have wired for the control , then it may be helpful to find the cause .
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top