Issues with a stepper motor drive
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Posted by chetanthegreat on February 17, 2008, 2:23 pm
Please log in for more thread options I am facing some issues regarding a stepper motor drive. The stepper motor I have is a 20KG 12V DC L/R Full step driven one. I need it to drive a Lead screw which eventually builds up pressures of the likes of 400Kg cm in a cylinder. I have attached a gear box of ratio 12:1 to the stepper and tried boosting the torque. With the direct coupling the pressure used to reach around 100-150 Kg cm but even with the gearbox which I presume would boost the torque by a factor of 12 the pressure fails to rise above 200. And the stepper slips if I try to run it at high RPMs (15RPM ) even without any load. What can I do to find a solution to these 2 problems? What could be going wrong in this whole exercise? Thanking you in anticipation. Regards, Chetan. | |||||||||||||
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Posted by Jamie on February 17, 2008, 3:30 pm
Please log in for more thread options is the stepper motor spec'ed out to operate at the desired RPM? Is this driver circuit something you made? if so, have you scoped out the actual signals ? etc.. we need a little detail on the circuit driving the stepper motor. P.S. Steppers are generally not suited for high speed applications. if you need indexing, maybe what you should do is use a DC motor with some torque and a A/B,Z feed back encoder into a uC or a PLC.. Like I said, I don't know your application. maybe you could spill a little more on the actual electronics here. -- http://webpages.charter.net/jamie_5" | |||||||||||||
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Posted by default on February 17, 2008, 4:27 pm
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>
>do you really mean 400kg/cm? that's about 5500psi. That's scary pressure. >This must be a massive structure. Not necessarily. There's something called High Performance Liquid Chromatography pump used in chemical compound analysis. A pump with a sapphire/ruby piston supplies milliliters per hour at pressures from 1-10K PSI. Sits on a table and occupies a half cubic foot or less. Just a little flow, at high pressure, through 1/16" SS tubing with a .02" bore . . . You are thinking in pounds per square inch and imagining lots of those square inches - when the tubing is very small even plastic will work. Not scary at all. It fails and the usual symptom is a dribble of liquid. Liquid under pressure is actually a lot nicer than steam or gas when it fails (as a general rule - there are exceptions). My first guess was HPLC when he said stepper and pressure . . . Chemists are always looking for a pump that won't cause pressure pulses. One way is to just load a large thick cylinder with liquid (lots of square inches) and just slowly squeeze it out at a ml/hr rate - no pulses since there's only one stroke of the pump. -- | |||||||||||||
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>
> I am facing some issues regarding a stepper motor drive. The stepper
> motor I have is a 20KG 12V DC L/R Full step driven one. I need it to
> drive a Lead screw which eventually builds up pressures of the likes
> of 400Kg cm in a cylinder.
> I have attached a gear box of ratio 12:1 to the stepper and tried
> boosting the torque. With the direct coupling the pressure used to
> reach around 100-150 Kg cm but even with the gearbox which I presume
> would boost the torque by a factor of 12 the pressure fails to rise
> above 200.
> And the stepper slips if I try to run it at high RPMs (15RPM ) even
> without any load.
> What can I do to find a solution to these 2 problems? What could be
> going wrong in this whole exercise?
> Thanking you in anticipation.
> Regards,
> Chetan.