A kind of motor that moves in steps.

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34 views

Can I use 7.2v lipoly for 12v stepper motors?

I planned to buy 2 stepper motors for small toy car. What I can find from aliexpress are mostly 12v products. I have lipo batteries already and they are 7.2v and 5400mA. Can I use this for 12v ...
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0answers
35 views

Current spikes when driving stepper motors

I am trying to figure out appropriate values for a timeout mechanism provided by the DRV8811 stepper motor driver. While doing my research I came across a website that conveniently has a write-up ...
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2answers
76 views

Make hard drive stepper motor run 7200 rpm

I have an old hard drive (7200 rpm) motor like this: I'm trying to make it run as fast as possible and I start with this code (arduino uno): ...
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1answer
38 views

Stepper motor current specifications - 12V/350mA, but draws more at lower speeds?

I have on hand a simple 12V/350mA stepper motor the datasheet is lacking, so I can only assume 12V is the maximum sustained voltage and 350mA is again, the maximum associated current. The datasheet ...
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2answers
28 views

CNC stepper motor driving CC vs CV

I am trying to design a small CNC maching for milling PCBs. I am using unipolar stepper motors driven by a microcontroller, but I am unsure of what tehnique to use to drive them. I once read that ...
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30 views

damage stepper motor energized

General stepper motor question: Is it safe to manually turn a stepper motor that is energized (holding at a fixed position)? Or could it damage the motor in some way? I'm working on an old stage ...
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3answers
47 views

stepper motor driver constant current under load, motor driver powering off losing brake effect

I am building a CNC-like machine using a microcontroller and 'FMD2740A Microstep Driver' modules to drive the stepper motors. My problem is the vertical axis where, despite a counterweight, there is ...
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0answers
25 views

PWM Chopping current and Decay Modes of motor drivers

This is my first experience with driving stepper motors, so please bear with me. I was looking again through the datasheet of the stepper driver DRV8811 and came across calculations that needed to be ...
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35 views

What is the “Home” feature of the Stepper Motor Driver IC (DRV8811)?

While doing research on efficient methods for driving stepper motors I came across the Texas Instrument IC DRV8811. This particular device has a Home feature that is explained very little. The ...
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1answer
59 views

Stepper Motor current rating and microstepping

I am working with stepper for first time and want some suggestions. Motor runs smooth but the problem is it gets hot after a few seconds. reason may be that i am giving it a bit higher than the rated ...
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1answer
49 views

Dead-reckoning vs feedback for motor position control of turntable

I am constructing a small turntable that holds a plastic cup and should be controlled to stop at one of eight positions. (Where it will receive a shot of liquid; think "Auto-cocktails"). I'm wondering ...
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1answer
47 views

V-I curve for Stepper Motor

I am new to stepper and want to know how velocity-current graphs are plotted for stepper motor. Is the speed graph plotted against the overall current drawn by the motor or it's single winding ...
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67 views

What is the maximum current at which I can drive my stepper motor?

I am using Oriental's PK-243-03A stepper motor in bipolar series configuration. The rated current of the motor is 0.31A/phase according to its datasheet. My question is if I am supplying it with 12V, ...
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2answers
65 views

How to measure stepper motor current?

I am using Oriental's PK-243-03A stepper motor in bipolar series configuration. The driver I am using is TI's DRV8825. I want to measure my motor's current in order to plot a Speed - Current graph. I ...
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1answer
34 views

Turn Stepper Motor Off when Idle

I was wondering if there is a way to cut power to my stepper motor when it is not in use. I dont particularlily need it to hold its position because in my setup it doesnt really need to torque agaisnt ...
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1answer
54 views

Measuring inductance and ESR of a motor using LCR meter

I am building a circuit, where a MCU will drive an unipolar stepper motor through MOSFETs and constant current source (not included in the schematic). simulate this circuit – Schematic ...
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1answer
41 views

Step size for controlling stepper motor

I am using a PK243 - 03A unipolar stepper motor, its step angle is 1.8 degrees. I am planning to step the motor periodically on it's starting frequency which is coming out to be 1.3kHz, to see how it ...
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2answers
78 views

Why does stepper motor not turn properly at different frequencies?

I have an 8 wire stepper motor and an unipolar motor driver. I wired the motor as unipolar connection. On motor 3.15V and 4.2A is written. My connection is above. When I connect V to 24V 14A source ...
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2answers
338 views

Why do we need a ramp for stepper motor?

I am a newbie and trying to understand how i can run a stepper motor. The concept i had in mind was that steppers need digital pulses to run, and i tried it out too. I was able to run the stepper i am ...
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2answers
67 views

Driving a stepper motor to a set force

I am trying to drive a Linear Actuator (stepper motor with a lead screw) to drive until a force of 15 pounds is reached then stop. I am having trouble finding a good method to do this (I am new to ...
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1answer
117 views
0
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1answer
48 views

Bipolar stepper motor sequence, wiring and dual h bridge

Im facing some issues to figure out sequence of my bipolar(specifically) and unipolar stepper motor. However , I've managed to get Dual H Bridge but couldn't find out the example/documentation for the ...
3
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1answer
276 views

Why is my DCDC getting fried when driving a stepper motor

I'm trying to get a stepper motor running using an L6470 stepper driver. L6470 is connected according to the recommended design. The motor is a NEMA23, rated 2A, inductance of 5.2mH and resistance of ...
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1answer
37 views

Per coil vs. per phase current

I'm working on a project using this stepper motor it is rated at 1.5 A/Phase current. Initially I planed of using this driver, so I checked if it can provide enough current for the motor. The website ...
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1answer
76 views

“Standard orientation” for stepper motors in data sheets

I just finished getting a SOYO 6V@0.8A unipolar stepper motor working, and wanted to know more about an issue I faced while doing so. I used the stepping sequence below with an L293D chip to drive ...
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1answer
93 views

Precision 0.5 degree Stepper needed for Turntable

Basically our project brief is to design a turn table, an object weighing around 10kg which will be placed off centre (but allowing around 20kg in case) to rotate in 0.5 degree increments, pausing for ...
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2answers
127 views

Is it possible to determine load on a stepper motor when stopped

Is there a way that the torque on a stepper motor can be determined without some kind of additional force sensor. Additional electronics such as current shunts etc would be acceptable. I would like ...
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2answers
120 views

How to tell when the stepper motor is done stepping?

I am working on a project that requires mildly accurate positioning of the x and y axis. It involves an airsoft gun and it is basically a motion tracking turret. Because of the requirements for ...
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0answers
49 views

Stepper motor with integrated circuits and encoder controlled by custom software

I am new to electronics but I have decent experience in programming. What I would like to do is have 2 stepper motors attached to my computer, and then develop a program that would control their ...
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0answers
79 views

Stepper motor to replace brushed DC motor to be used to start a gas engine?

I'm trying to decide if it would be possible to use a stepper motor to replace a current 12V DC brushed motor that is used to turn over a small (~149cc) gas engine for starting. The reason why is, I ...
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1answer
151 views

Bipolar stepper motor (Alfa Romeo 156 speedo) w/ L293D

I would like to use my Alfa Romeo speedo in my simrig, I have got the cluster pinout and the speed signal is coming from the ABS (Just like any other car, my BMW cluster works like charm). The only ...
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1answer
75 views

Current on Easydriver stepper pin

I am using an Easydriver v4 to drive a bipolar stepper motor. The Easydriver works fine, if I wire it up and manually toggle the step pin to 5V/GND it steps as intended. Now I connected both the step ...
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1answer
435 views

Wiring up a 4 pin DVD drive stepper motor?

I have removed a stepper motor from a DVD drive which looks like the following: http://forums.parallax.com/attachment.php?attachmentid=102789&d=1373845076 As seen, there are 4 pins in a ...
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5answers
304 views

Can a motor's movement be improved to any arbitrary resolution?

For a project that I'm working on, I need motor rotation at extremely small increments -- my desired resolution is about ~0.15 degrees per minimum rotation step. Of course, most motors of reasonably ...
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1answer
105 views

Stepper motor driver differences?

I have recently used a H bridge to control a small stepper motor obtained from a DVD drive and now want to look into controlling something larger, for example large Nema 23 steppers. From reading ...
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1answer
85 views

External power supply necessary to run two stepper motors from a RPi?

I am following this tutorial for a CNC laser engraver. I have two stepper motors from some old DVD drives and two L9110S H-bridges to control them. I am now working on putting it all together and ran ...
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2answers
567 views

How to determine bipolar stepper motor wiring (came from a 3.5 inch floppy drive)?

I have extracted a small stepper motor from a 3.5 inch floppy drive, that I intend to use with an Arduino or Raspberry Pi. The problem is: initially a thin ribbon cable was attached to it, with no ...
0
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1answer
185 views

Stepper motor is heating up?

I am using stepper motor for my CNC machine. Its model number is EM284 STP-42D221-01 by Shinani Kenshi. I don't know any specs of this motor; neither voltage rating nor current rating. I don't even ...
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2answers
147 views

PWM control of air core motor

I am driving an air core motor using PWM control from a microprocessor. The position of the air core is dictated by the combined magnetic field created by applying 2 currents to 2 coils (sine coil ...
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2answers
86 views

Power Conducting Stepper Motor?

I have a question that I'm not really sure how to ask, so here goes: So I know there's such a thing as a power conducting slip ring motor, which I assume allows the passthrough of power through the ...
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33 views

What is an 8-phase-stepper?

In an old device I am currently working with we found out that the engine is an 8-phase-stepper engine. Until then I only knew 4-phase-stepper and 2-phase-stepper. So, what is an 8-phase-stepper? And ...
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1answer
58 views

Drive Stepper Motor using parallel Port

im having a little difficulty to drive this kind of motors using parallel port..have googled loads tutorials but unfortunately couldnt found any color codes or types of motors i have..i cannot even ...
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1answer
96 views

Where can I find used servo/stepper motors? [closed]

For practicing purposes (Arduino and other controllers), from what old equipements can i recover (recycle) small servo/stepper motors? Maybe old printers...?
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1answer
103 views

Adding diodes to easy driver stepper motor driver

I had an easy motor driver damaged by removing the motor while the drive was energized. I sent an email to Brian Shmalz to see if there was anything that could be done to protect the board in these ...
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2answers
1k views

Slow down stepper motor's speed using stepper driver DRV 8825

I've got a Nema 17, rated at 0.8Amps, stepping angle of 1.8 degrees. The motor looks like this, and has six wires coming out of it: The four wires I've used are the ones labeled below (I was ...
0
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1answer
315 views

Can I control multiple stepper motor drivers from one controller?

I need to drive 6 stepper motors in open loop with 1/4 microstepping. The application requires all 6 motors to move by the same number of steps at the same time. There are no sensors of any kind on ...
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1answer
41 views

Limit the coil's voltage of the stepper motor

When the step motors are used with a current-controlled driver, also known as a chopper drive. The driver will increase output voltage when the motor runs much faster, because the faster the motor ...
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2answers
157 views

How to eliminate the wrong direction torque of stepper motor

I want to eliminate the wrong direction torque of stepper motor during super fast decelerating. The wrong direction torque is that: When you suddenly decelerate the input pulses of stepper motor's ...
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2answers
238 views

Can I use electrical braking with stepper motor?

Can stepper motor use electrical braking? I think I can stop a running stepper motor more quickly with an electrical braking resistor. Is this feature popular among stepper motor controllers? I am a ...
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1answer
317 views

Running a low voltage stepper motor with a A4988 and 5V power suply

I got this little car I built using two of these motors and A4988 drivers. It was running with a 12V power supply, but I'm trying to get it on a battery and running for about 8 hours. thought I could ...