Hey guys, just wanted to get some ideas on a problem I'm having with my stepper motors. I've been finding lately that my motors that run my x and y axes are getting REALLY hot and I'm really worried that if I don't find a way to solve it, they're going to burn out. I'd rather not have to replace them. Any help/ideas on reducing the heat they build up would be great. :S
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Burn out?
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Re: Burn out?
I'd recommend turning down the pots on your Pololus as discussed here: [reprap.org]. Do some test runs after turning them down; if you go too far the motors will not be strong enough to make the moves without skipping steps. Alternatively, you can put heatsinks on the motors like this: [www.tridimake.com].
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Re: Burn out?
Well, thing is I'm running Printrboard electronics (probably should have stated that :P ), not Polous. The heatsink thing is an idea though, prefer it to fans.
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Re: Burn out?
there will be trim pots next to drivers you 'll need too adjust them to suit the voltage and current to suit your motors
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Re: Short shaft stepper motors
why don't you aks your friend Mr saw?
There is small circular saw for electronic driller (like this one: [i60.servimg.com])
it work pretty well. I did that for one of my motor.
There is small circular saw for electronic driller (like this one: [i60.servimg.com])
it work pretty well. I did that for one of my motor.
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Axis X - Stepper Motor Problem
Hi all,
After a few minutes printing, my X Axis stepper motor starts to hammering, its not a mechanical problem.
[www.youtube.com] - video of the problem
Could someone assist me?
Tks.
After a few minutes printing, my X Axis stepper motor starts to hammering, its not a mechanical problem.
[www.youtube.com] - video of the problem
Could someone assist me?
Tks.
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Re: Stepper Motors at Liquidation Prices!
You don't seem to ship to Australia.
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Melzi Drive Capacity
Hi All
I have a Melzi Board on my Mendal and want to swap the extruder drive stepper motor for a linear actuator stepper motor to drive a syringe.
I have found a bipolar motor which is rated at 2.33v and 1.5A (1.5A per phase....).
My question is, will my Melzi board deliver enough current to drive this new motor?
I'm not sure whether the board will be overloaded or not.
Are both phases of a bipolar stepper motor ever active at the same time (which would mean 3A being drawn... which is probably too much for the Melzi).
Any help gratefull recieved.
Thanks
I have a Melzi Board on my Mendal and want to swap the extruder drive stepper motor for a linear actuator stepper motor to drive a syringe.
I have found a bipolar motor which is rated at 2.33v and 1.5A (1.5A per phase....).
My question is, will my Melzi board deliver enough current to drive this new motor?
I'm not sure whether the board will be overloaded or not.
Are both phases of a bipolar stepper motor ever active at the same time (which would mean 3A being drawn... which is probably too much for the Melzi).
Any help gratefull recieved.
Thanks
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Measuring linear motion
Hello,
I'm new to stepper motos and i have a piece of information.
I want to know how i could find out the magnitude of linear movement from its catalogue?
Thank you
I'm new to stepper motos and i have a piece of information.
I want to know how i could find out the magnitude of linear movement from its catalogue?
Thank you
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Linear actuator and stepper motor
Hello,
What are the differences between linear actuators and stepper motors exactly?
Thank you
What are the differences between linear actuators and stepper motors exactly?
Thank you
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Re: Threaded Rod NEMA 17
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Re: Linear actuator and stepper motor
Linear Actuator in fact has no relation with stepper motor in the beginning.
Stepper Motor is Rotary Actuator.
But to travel in line is required in many applications, so belt and pulley are used.
But belt and pulley cann't meet all needs of linear motion, so the linear actuator appears.
Solenoid can be taken as the very simple linear actuator. And people are use stepper motor with coupler and leadscrew to convert rotary motion to linear motion.
Threaded Rod Linear Stepper Motor comes based on the idea of Stepper Motor, Coupler and Leadscrew combination, but coupler is eliminated to ensure much better performance.
Stepper Motor is Rotary Actuator.
But to travel in line is required in many applications, so belt and pulley are used.
But belt and pulley cann't meet all needs of linear motion, so the linear actuator appears.
Solenoid can be taken as the very simple linear actuator. And people are use stepper motor with coupler and leadscrew to convert rotary motion to linear motion.
Threaded Rod Linear Stepper Motor comes based on the idea of Stepper Motor, Coupler and Leadscrew combination, but coupler is eliminated to ensure much better performance.
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Re: Linear actuator and stepper motor
Thank you very much
but now i have another question...
which one do you personally think is better? linear actuator or stepper motor?
to achieve the most accurate and smoothest linear motion?
but now i have another question...
which one do you personally think is better? linear actuator or stepper motor?
to achieve the most accurate and smoothest linear motion?
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Re: Axis X - Stepper Motor Problem
Your X axis belt looks very loose? Is the belt slipping on the motor pulley?
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Re: Axis X - Stepper Motor Problem
Thanks for the response!
No, its not slipping on the motor pulley, it is not a mechanical problem.
I notice that the problem doesn't occurs if the extruder operates at maximum temperature of 185 C, and with the bed off.
So, it becomes impractical for ABS printing... :(
No, its not slipping on the motor pulley, it is not a mechanical problem.
I notice that the problem doesn't occurs if the extruder operates at maximum temperature of 185 C, and with the bed off.
So, it becomes impractical for ABS printing... :(
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Need a stepper driver recommendation
So I have some Wantai 42BYGHW811 wantai.com and I was wondering what stepper drivers to use with them to make them work.
Using Sanguinololu 1.3a.
I need 8 total so good deals are appreciated.
Using Sanguinololu 1.3a.
I need 8 total so good deals are appreciated.
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Stepper, torque, volts, pps
Hi all
Trying to make some sense of this
Objective : maximize torque and rpm and validate my (mis)conceptions
Application is non reprap
Motor :wantai nema 23, type 57byg621 torque curve attached
[www.wantmotor.com]
Max torque, 12.5 kg cm at 24 V, half step
Halfstep gives 40% more torque than full step, but some say 4988 enegizes both coils at full step too, but can't find it in the spec sheets-confirmation would be great
Typical power supply is 12V so torque=50%?
If a gearbox is used, for torque multplication, this often needs an increase in rps, to keep speed, this increases pps, torque is reduced -high pps drops torque ?-see attached torque curve(also efficiency of gearbox costs up to 50%)
Possible solution:increase volts to max 25 times (according to Gecko) the rated voltage, say max 45/48 volt? (using DRV driver instead of pololu) Driver amps set to motor amps in spec sheet . Motor will run hot. This doubles torque?? (Almost) but assume that BEMF becomes an issue-considering to use L6470 driver for compensation
If microstepping is used, torque as total remains the same, just divided per microstep?
But microstepping increases pps, so lower torque again-as per curve?
Appreciate your help in this
Coolerooney
Trying to make some sense of this
Objective : maximize torque and rpm and validate my (mis)conceptions
Application is non reprap
Motor :wantai nema 23, type 57byg621 torque curve attached
[www.wantmotor.com]
Max torque, 12.5 kg cm at 24 V, half step
Halfstep gives 40% more torque than full step, but some say 4988 enegizes both coils at full step too, but can't find it in the spec sheets-confirmation would be great
Typical power supply is 12V so torque=50%?
If a gearbox is used, for torque multplication, this often needs an increase in rps, to keep speed, this increases pps, torque is reduced -high pps drops torque ?-see attached torque curve(also efficiency of gearbox costs up to 50%)
Possible solution:increase volts to max 25 times (according to Gecko) the rated voltage, say max 45/48 volt? (using DRV driver instead of pololu) Driver amps set to motor amps in spec sheet . Motor will run hot. This doubles torque?? (Almost) but assume that BEMF becomes an issue-considering to use L6470 driver for compensation
If microstepping is used, torque as total remains the same, just divided per microstep?
But microstepping increases pps, so lower torque again-as per curve?
Appreciate your help in this
Coolerooney
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Re: Stepper, torque, volts, pps
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Typical power supply is 12V so torque=50%?
Same torque at standstill, but the torque loss due to speed kicks in earlier.
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Objective : maximize torque and rpm
You should have clearer numbers. How many RPM are required, how much torque is sufficient? "maximize" means using 480V, 4A and water cooling (to compensate for the over-current).
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Re: Stepper, torque, volts, pps
Hi Traumflug
i want to know if the whole torque curve is reduced with 50% when voltage is reduced withe same %
To be realistic 480 volts , 4A is a bit OTT, as said, max is about 25x rated voltage, with this motor about 100V, but driver can do as stated max 45V so that is the practical limit
The built in charge pump in the L6470 can compensate for BEMF (partly)
The point is that rpm (rps) and pps are linked, therefore you can reach corner speed very quickly when you start microstepping-right? As per my original question
So if we do a simple 200 step/revolution, accoording to the torque curve we start to loose torque over 800pps, 4 rps- direct drive with 8 teeth T5 pulley yields 160 mm travel/sec
At >5000 pps, torque is about 25% of peak
Looking for 300mm/sec, =8 rps/ 1600 pps so my options are bigger motor or higher voltage
Microstepping again makes this worse?
Appreciate if you comment on my other questions
Thx
Coolerooney
i want to know if the whole torque curve is reduced with 50% when voltage is reduced withe same %
To be realistic 480 volts , 4A is a bit OTT, as said, max is about 25x rated voltage, with this motor about 100V, but driver can do as stated max 45V so that is the practical limit
The built in charge pump in the L6470 can compensate for BEMF (partly)
The point is that rpm (rps) and pps are linked, therefore you can reach corner speed very quickly when you start microstepping-right? As per my original question
So if we do a simple 200 step/revolution, accoording to the torque curve we start to loose torque over 800pps, 4 rps- direct drive with 8 teeth T5 pulley yields 160 mm travel/sec
At >5000 pps, torque is about 25% of peak
Looking for 300mm/sec, =8 rps/ 1600 pps so my options are bigger motor or higher voltage
Microstepping again makes this worse?
Appreciate if you comment on my other questions
Thx
Coolerooney
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Re: Stepper, torque, volts, pps
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you can reach corner speed very quickly when you start microstepping-right?
Microstepping doesn't help in acceleration at all, as it doesn't increase torque. You just need more steps for the same speed.
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At >5000 pps, torque is about 25% of peak
But you need 1600 pps only, so you're far above these 25%. And yes, to increase torque at higher speeds, you need more voltage.
I have the impression you make too much a headache about the issue. There's plenty of experience, so you can safely assume a standard configuration works. And you can always increase voltage (within the stepper driver limits) later.
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