Re: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
QuoteNoobMan So again, its not a current sinusoid that is generated eslewhere than forced into the coil. Current just grows in the coil as result of playing with voltage, and that is the elemental law...
View ArticleRe: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
We very much do generate a sinusoidal current to drive a stepper motor. The stepper is being operated as s synchronous AC motor when it's in micro stepping mode. The data sheets for the stepper chips...
View ArticleRe: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
At high and constant speed and if you disregard the constant current chopper drive it might look like a sinus curve. In all other cases such as slow speed and/or with frequent starts and stops the...
View ArticleRe: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
In the world of printers, we (hopefully) smoothly accelerate and decelerate the stepper. That means we have a varying frequency sine wave that's the drive in the high speed case that this all came out...
View ArticleRe: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
Ohms law never plays a direct role in deciding the current through the motor. The chopper circuits always limits the current to the set level. The drivers in printers are mixed...
View ArticleRe: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
QuoteDala.horseOhms law never plays a direct role in deciding the current through the motor. The chopper circuits always limits the current to the set level. If we dig deep enough, i guess something...
View ArticleRe: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
Quotebobc QuoteNoobMan So again, its not a current sinusoid that is generated eslewhere than forced into the coil. Current just grows in the coil as result of playing with voltage, and that is the...
View ArticleRe: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
Quoteuncle_bob In the world of printers, we (hopefully) smoothly accelerate and decelerate the stepper. That means we have a varying frequency sine wave that's the drive in the high speed case that...
View ArticleRe: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
"But to say that Ohms law does not apply or that there is a region that is "outside" of ohms law - anybody with an elementary course in electronics can not say that." Noobman said. Yes I can say that...
View ArticleSelection of a Stepper Motor Driver + Control circuit
I have a 3-phase stepper motor (Y - Config) with a pot as feedback on a butterfly valve. I am not confident to select a 3-phase stepper motor drive + design a control circuit to control that drive...
View ArticleRe: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
Yes thats me and my methodics. Now you quoting only that part it looks to me i had a tone, wasnt actually intended, and certainly uncalled for, so very much sry for my tone that just now see, it wasnt...
View ArticleRe: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
Probably better to have some example, so i took your values of 24V and 1ohm coil, and i also took L=2mH, coz i need something for time constant, and i took a set point of 1A. And i change...
View ArticleRe: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
Quotebobc QuoteNoobMan So again, its not a current sinusoid that is generated eslewhere than forced into the coil. Current just grows in the coil as result of playing with voltage, and that is the...
View ArticleTrying to find a stepper motor under 1A but with enough torque
I'm having extreme difficulty finding stepper motors to buy. My drivers are only rated for 1A, but every motor I can find has the torque drop significantly once you go under that. I must be...
View ArticleRe: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
QuoteNoobMan Quotebobc QuoteNoobMan So again, its not a current sinusoid that is generated eslewhere than forced into the coil. Current just grows in the coil as result of playing with voltage, and...
View ArticleRe: Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees
Well, first off, why dont we all look at names and who posted what. I may be a "dick", ill take that, but in particular i am not that poster "cnc dick" and i didnt made that post about your wisdom....
View ArticleVariable Reluctance Stepper Motor Driver
Hi all, I have a Variable Reluctance (VR) stepper motor and it is 3-Phase Star configuration. The maximum current consumption is around 3A, but normally around 0.3A. I am trying to source stepper...
View ArticleRe: old stepper motors stuck
Quoteuncle_bob If the motors are powered up, it's normal for the shaft to be "stuck". If the motors are not powered up, you should be able to turn them with your fingers. Unless two of the naked leads...
View ArticleCan't stop Y-Axis motor
Hi all, My printer is Prusa i3 with RAMPS 1.4 and four 4988. All functions are fine, I can print anything what I want. Today, I try to use Repetier to stop motor, X and Z motors release but the Y-Axis...
View ArticleGot printer electronics now stepper wont reliably move
I received half of my printer kit. Electronics package and steppers. RAMPS 1.4 Trying to test the wiring and everything before the hardware arrives. The end stops, thermister, fan, led's, and heaters...
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