# EM-483 Specifications

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## Introduction: EM-483 Specifications

I have seen many people, including myself looking for technical specification for this particular stepper motor stripped from old printers but nothing seems to show up so I decided to share with you some characteristics and the recommended operating parameters I have discovered:

Type: Bipolar Stepper Motor

Supply: 5-6V

Coil Resistance: ~3.6 omhs

Max Current: ~1.4A

Operating frequency: 500Hz

Maximum speed: 150 rot/min

## Step 1: Driving Algorithm for the Stepper Motor

I have set the operating frequency at 500Hz because if you go higher the electromagnetic inertia of the of the coils will make it so there is a high danger for the motor to skip steps if put under load. It also gives you nice round numbers when doing the math.

As shown in the picture the algorithm requires the following 8 step sequence applied to both coils for it to work properly. Each sequence takes 8ms and moves the motor 4 steps (7.2 degrees).

Because the stepper motor has 1.8 degree step it takes 200 steps to make a full rotation, thus we can calculate that a full rotation will be done in 400ms.

And from that you can get the 150rot/min maximum speed.

The 500Hz operating frequency is derived from the fact that you have 4ms pulses for each step (3ms active 1ms pause) but you have 2 coils, so you get a step each 2ms.

1000ms/2ms=500Hz

Correct me if I'm wrong.

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## 11 Discussions

hello guys. i suppose to make a mini sand disc roller for sharpening things but no way for me. i also have 4 of the same kind as EM-483 (epson t10 and r230). i only wanted to know, how much voltage input for this just to continuously rotate in faster speed. is there a ceiling voltage i should be look into? instructional videos i had encounter provides me the connections must have to. i have tried connecting the wire 2 to wire 3 and supplied 12V, but nothing happened. any help please :(..

Hi, I have this motor and try to test it in Universal Gcode Sender, any know has to configure settings?
I have Arduino Uno, CNC Shield V3 and DR8825 drivers (how much Vref voltage needs?)

200 steps/ 1 rotation

Also .. had no problems running it on 12 volts.

Does not heat to much when using 12v??

The waveform on coil B during the 8th transition should have a line (a return) to the the 0v rail to "close-off" (finish) the actual waveform.

I extracted the same bipolar stepper motor from an epson printer and want to drive it with L293D.

I would expect your waveform to have values between positive and zero. Why do you include negative values?

Thank you

Your waveform is incorrect, notice how 1=8 and 5=4... You need to shift the bottom wave left by one unit (or the top right) .