Re: Calculating motor torque required
So basically what you're saying if I understand you is that drivers have certain amount of on and off time within the pulse time sent to the from the micro controller. Also that you can predict the...
View ArticleRe: Calculating motor torque required
Looking at the A4982 data sheet it looks like you can set the off time by using a resistor on the ROSC pin and the resistor value divided by 825 gives the off time in micro seconds.
View ArticleRe: Calculating motor torque required
Yes and other IC can sort of do that, even if the driver manufacturer use support components to set a fixed value for that. For example Mr Nophead has a post here on the topic, in a case like that...
View ArticleRe: Calculating motor torque required
I appreciate the insight but it's getting away from what I originally posted about which is calculating the torque required for a load to move with a desired max acceleration and top speed. You are...
View ArticleRe: Calculating motor torque required
I did that because i was under the impression that you are using the "pulse frequency" (that is the step frequency?) as an input variable. I meant to explain the frequency at which the coils have...
View ArticleRe: Calculating motor torque required
QuoteMeltManBob I[...] the capabilities of the micro controller to send pulses [...] That 50uS assuming 20?kHz which the smoothie can output is not related to the coils, it perhaps related to the...
View ArticleRe: Calculating motor torque required
Ok thank you for trying to get back on track :) The pulse time was just a random number I chose to use but can be adjusted. If I understand correctly which is what I was assuming before, the pulse...
View ArticleRe: Calculating motor torque required
I looked at the datasheet some more trying to figure out how the supply voltage effects the output voltage even though they are not directly linked and couldn't find much. The trip current is set by...
View ArticleRe: Calculating motor torque required
QuoteMeltManBobSo how do I find out what the maximum voltage is that can be produced by the driver? Read the data sheet. Typically some 35V to 40V.
View ArticleRe: Calculating motor torque required
QuoteMeltManBob It sounds like what you are saying about reaching the max current is the driver is capable of reaching voltages higher than the supply voltage in order to dictate the current limit...
View ArticleRe: Calculating motor torque required
QuoteMeltManBob I looked at the datasheet some more trying to figure out how the supply voltage effects the output voltage even though they are not directly linked and couldn't find much. The trip...
View ArticleRe: Calculating motor torque required
Now if i said that a certain time is equivalent of some frequency, that is 1/time, and its just to figure out an idea, if all the periods will be just like that (leaving offtime aside for now, for...
View ArticleRe: Calculating motor torque required
Oh and if i have not said this already, the actual output the motor produces, is directly proportional, by definition, to the current that is in the coil. This is why we had to go into all that math....
View ArticleRe: Cheap unipolar NEMA 17 motors in Québec
Merci pour les informations jlguil, je vais essayer de modifier un de mes moteurs en fin de semaine pour le tester avec mon contrôleur bipolaire.
View ArticleRe: Calculating motor torque required
Sorry for not getting back earlier but I was only able to reply quickly before because I was home sick. Reading through what you've written it sounds like the approach I was taking in my initial post...
View Articlegood source for non-captive linear steppers?
Hello I am looking for a good source for affordable non captive linear stepper motors, something in the nema17 range. I need at about 150mm usable stroke for driving the plunger down in a syringe,...
View ArticleMicrostepping not constant
Hi, I´ve build a pan/tilt-head for a DSLR. There is only a reduction by the pulleys of 1:4,5 on both axis. And there is no high load, which needs to be moved. I'am using the DRV8825 stepper drivers...
View ArticleRe: Microstepping not constant
I think steppers are not really efficient motors so i doubt its the type to run from a battery, but on the other hand i suppose you do not have much choice. For a mod, if you run it only full step (no...
View ArticleRe: Microstepping not constant
Nophead investigated uneven microstepping: [hydraraptor.blogspot.de]
View Articlestepper motors not working at all
so I've got the power supply hooked, the firmware uploaded, and all the wires in place, but none of the motors move at all. last week I got one of them to move a little bit but since then I've taken...
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