motor control
motor control
(OP)
Have an interesting project
need to control a 24 volt DC motor with 96 volt DC series motor controller. The idea is to ramp up the voltage slowly and then pop it into 'turbo' to finish.
The first question is will the series DC motor even work (it is provided by Curtis Instruments) ? The other question is is there another off the shelf option. There is not enough money in the project for custom design.
Thanxs,
TJ
need to control a 24 volt DC motor with 96 volt DC series motor controller. The idea is to ramp up the voltage slowly and then pop it into 'turbo' to finish.
The first question is will the series DC motor even work (it is provided by Curtis Instruments) ? The other question is is there another off the shelf option. There is not enough money in the project for custom design.
Thanxs,
TJ





RE: motor control
RE: motor control
If you can limit the output voltage to 24vdc then yes I can see no problem in this.But dont forget you must not exceed the 24cdc.Also will your controler supply the current.Also why dont you just get the correct controler.
Barry.
RE: motor control
...TJ
RE: motor control
RE: motor control
If you need to "squeeze the max" out of the motor, and need a bigger speed range, I would suggest you rather use some type of friction gear, similar in function to that of a vespa scooter, or another variable gear.
I have no idea of the application or the lifetime you would expect from your device, but 96V is definately not recommended. I would not exeed rated voltage with more than, say, 20-30%, if I wanted to use this device more than once....
I'm not aware of any suitable controllers for you, maybe someone in Automotive > Transmission and Driveline engineering Forum would have an idea..?
RE: motor control
thanks, TJ
RE: motor control
The second part is that you say that you need to accelerate and move very fast. And do it once. That means that you can apply a lot of overvoltage - probably 96 V for a few milliseconds - to overcome armature inductance in the first place. Then, you may keep a moderate overvoltage - say 150 to 200 percent (36 - 48 V) to accelerate up to the maximum speed the motor can take without being destroyed within a few seconds.
If I understand you right, it looks like you are doing some kind of "drag racing" with your device. That might mean that you will be accelerating all the way right onto target. And that is just as good an operational mode as anyone else. It certainly will get you there the fastest.
You need to talk to the motor manufacturer to get the limits the motor can take. Applying 96 V PWM pulses is perfectly legal. Just adjust the PWM D.C. so that the motor survives the first 98 percent of the travel. If it dies just before it hits the goal is probably of no concern since inertia will take it the few last inches (or feet - or whatever the distance might be).
Gunnar Englund
www.gke.org