I need help in designing and simulating a circuit on PSIM/Matlab/ PSpice for a simple DC motor going forward/stop/reverse using a 12Vdc source
My application is a power window DC motor controlled by up/neutral/ down window switch - any tips/ideas?
Help with simple DC motor
May 12, 2008
6 Replies
What exactly are you trying to simulate? The motor as a load, or the terminal behavior of the motor, with position out vs. volts in?
Are you asking which of the above mentioned tools would be best for this?
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html
Behavior of the motor - showing outputs (voltage, current, speed) when the up switch is pressed and then the same for when the down switch is pressed with the motor spinning the other way to roll down a window
I guess I need an H-bridge type circuit
Yes.
Plus:
1. When the switch is released, and it goes to neutral, do you want to
brake the motor or let it coast to a stop?
2. Do you want to have limit switches at the ends of the window\'s
travel or do you just want stall current to be drawn until the
switch is released and goes to neutral?
JF
s?
ys.
Which ever is easier for both those options
Model the motor as a resistor (the armature resistance) in series with a capacitor that's in parallel with a resistor. The cap/resistor parallel combination simulates the inertia and friction of the mechanical load, as seen by the motor.
Set the series resistor value to the armature resistance, set the second resistor (that's in parallel with the cap) to properly establish your expected 'running' current, then choose the cap to give you the right mechanical time constant.
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com
Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
ed text -
Thanks for the help - will look into it
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