Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
With both phases energized a bipolar stepper with 1 Amp per phase should draw 2 Amps.I notice the remark: stepper motors can rotate up to 3000rpm and work well up to 1000rpm.
A 1.8 degree motor has 200 steps per revolution.
It takes 4 patterns applied to the stepper to make one step.
So we need 800 patterns per revolution.
For 900 RPM you need 900*800 patterns per minute which is 720,000.
So the output of the controller is 720kHz.
Did I get something wrong ?
To add to 3v0's post this link is a pretty good and informative read.
A 1.8 degree motor has 200 steps per revolution.
It takes 4 patterns applied to the stepper to make one step.
Did I get something wrong ?
The first question, you ask about current draw.
Some datasheets are described differently, for my college project I'm using stepper motors running in unipolar (just cheaper to build). My datasheet says 2.8A and 2.8V per phase, so you'd think that this would be a total of 2.8V at 5.6A - nope. My datasheet counts "phase" as the total current drawn, so its actually 2.8V 1.4A per coil.
Do what I did, wired it in either the unipolar, bipolar series or parallel and connect to a variable power supply. Set it at the rated voltage and then see what the current draw is, then you will know what you datasheet actually means.
Are you building or buying the controller, if you are building then you wont get anymore than 100rpm without a current chopper and higher power supply voltage - I have built mine including a current chopper and only get about 5-600rpm before it resonates and stops spinning. Many of the controllers can get 1000rpm, someone on youtube has managed 18,000rpm with a 3Nm motor - no load, 2000rpm with a load. Steppers have tonnes of torque so you can always gear them to spin faster.
Boy was I all wet on this one. My bad.I think your wrong about the 4 patterns per step. Each step is one pattern, the next step is the next pattern and so on.
200(steps = 1 revolution) x 900(revolutions per minute) = 180,000(steps per minute) / 60(second in minute) =3000Hz