# Tagged Questions

57 views

### NEMA 17 stepper motor [closed]

I'm going to use 4 NEMA 17 stepper motors to build a quadcopter. I need to find the maximum upthrust that a single motor can give with a propeller of length 6cm (end to end). The holding torque of the ...
110 views

### How fast we can change direction of rotation of a stepper motor

I want to do the following of a stepper motor with following characteristics which has 100 RPM change DOR(direction of rotation) every alternative rotation in the opposite direction control the ...
112 views

### Calculator Printer Control (how to drive Epson dot matrix printer)

I have small dot matrix printing device that I'm trying to control (i.e. print to) with a Parallax Propeller board. (See images below.) It's the printer from this: ...
383 views

### Difference between Brushless Motor and Stepper Motor

I think I understand the operating principles of a brushless motor and a stepper motor, but I'm a little confused about the difference. Is a brushless DC motor a very basic stepper motor? With ...
108 views

### How to identify stepper motors?

I have a bunch of motors that I collected from different places. How can I figure out which ones are stepper motors? I have access to the datasheet for most of them, just not sure what to look for. ...
203 views

### Can a constant-current stepper driver be coerced to act like a constant-voltage driver?

I have a strict requirement1 to drive a stepper motor with an L/R (Constant Voltage) driver but the problem is, nobody seems to commercially make these anymore due to their inefficiencies compared to ...
742 views

### L297 stepper motor driver inhibit issue

I've knocked together a L297/L298 stepper motor controller and have a problem with what seems to be half the output. On the final 4 output lines after the L298 and diodes, I have 2 bipolar LEDs to ...
81 views

### Precision with a continous servo motor

Ok, here's my problem: I need to create a needle that can rotate continously in both directions and an infinite amount of "loops". I guess the ideal is to use a servomotor, isn't it? I couls use ...
2k views

### How to reverse rotation direction of stepper motor

Is it possible to reverse a stepper motor's direction of rotation by changing the polarities of its wires? I'm asking because I have two stepper motors connected to one single driver and mounted on ...
173 views

### What type of stepper motor should I use in my project and how do I control them?

I'm building a video camera pan and tilt head. Here's what I'm getting at: I'll need one motor to control the horizontal rotation of the camera, and one for the vertical. The horizontal motor ...
231 views

### Control old printer motor with position ring

I purchased two old printers at a garage sale today in hopes of dismantling them and playing around with some stepper motors. After tearing both of them apart I discovered that there are no stepper ...
107 views

### Slowly turn a planisphere at the sidereal rate

My problem is to rotate a planisphere (a star chart) at the sidereal rate. I will set the planisphere to its initial position manually, then turn on some device which rotates the planisphere on its ...
66 views

### PWM npn sinking signal

I have a stepper motor(with STR2 Step Motor Drive) which needs npn sinking signal to operate. dsPIC33EP512mu810 is capable of generating high resolution pwm. However, the PWM signal can only turn on a ...
175 views

### Problem with stepper motor not landing on same spot

I had a quick question regarding a stepper motor that I'm working with. I am running the 5 pin, 5V motor via an Arduino board and using the sketches provided. I am trying to get the motor to rotate in ...
110 views

### Input rated current for easydriver 4.4

I am using easydriver 4.4 to control stepper motor. Easy driver takes input voltage from 7 to 30V. I fed 20V 3.0A to easydriver, but i got it burnt (easydriver)*. Is 3.0A too much for easydriver ? ...
1k views

### Can a motor driver for 5V be used for a 24V motor?

I’m controlling a 5V motor with Arduino but need more torque which means a more powerful motor. Here is my scheme. (I took it form a tutorial): Here Arduino is controlling a 5V unipolar stepper ...
278 views

### How to drive stepper motor at maximum speed with a higher voltage power supply in hand?

I had a question about "Wantai" Stepper Motor with an Arduino hooked up to an motor-shield. Looking at the spec sheets the max volts and current allowed in that particular stepper motor is 3V and 2A. ...
1k views

### How is this design for a basic PCB pick and place?

I have zero experience with any serious mechanical design, but out of necessity and curiosity, I'm attempting to build a pick and place machine (for my hobby projects as well as low-volume PCB ...
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### Recommend motor type to turn baby rocker, into auto-rocker

Would like to convert a baby bouncer (like this one), which requires continuous manual effort to rock it, into one that use electro-mechanical means to auto-bounce. However, my aim is to make these on ...
355 views

### What is this type of motor called?

Firstly some background: I would like to make a magnetic stirrer, like the ones they use in chemistry labs: A small bar magnet sits inside the glass jar, while another bar magnet, attached to a ...
220 views

### Stepper motor phase

I have a question related to stepper motors. What does the "phase" of a stepper motor mean? I mean when we say that a stepper motor is a 2 phase stepper motor or a 4 phase stepper motor, what does it ...
430 views

### stepper motor current rating

I am having 8 wire stepper motor rated as 12V ,0.95A, and torque=1kg cm it has coil resistance 3 to 4 ohms. I have successfully run this motor with help of this forum. Now i have one doubt regarding ...
4k views

### Where can I get a small cheap linear actuator?

First, I should clarify: I am not looking for much power or much precision. I am looking for the cheapest thing I can plug into an arduino. I am just looking for stuff I can use for ...
382 views

### how to choose the transistor for following case?

I planned to use the following circuit to run unipolar motor. I got this circuit by surfing internet. I know how to choose the transistor for driver circuit by knowing the base current, but in this ...
974 views

### how to find out wether the stepper motor is working or not?

I have unipolar stepper motor with 6 wires and i have made controller circuit but when connect controller to stepper motor it is not working.. So i want to know weather stepper motor is working or ...
2k views

### How to find out whether I have a unipolar or a bipolar stepper motor?

I have one stepper motor. There are six wires coming out of that. How can I find out weather I have a bipolar or a unipolar stepper motor? Note: Related, but not a duplicate: Unipolar and Bipolar ...
2k views

### stepper motor controller

I wish to know how to build a simple stepper motor controller which can run a bipolar stepper motor in forward and reverse direction in desired speed? My project requires only 5 RPM so high speed is ...
1k views

### how choose transistor for driver circuit of stepper motor?

I need to drive a 1A stepper motor coil from a digital output that can source only 5mA. That would require Hfe of 1A / 5mA = 200, but I can't find a transistor with that much gain. Is there any ...
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### stepper motor digital frequency and speed?

In what way the frequency of digital pulse affect the stepper motor funtion. I want know this because i can send digital pulse through my data acquisition card at rate of 100Hz. I want to run bipolar ...
721 views

### how to construct stepper motor driver?

I am going to do one project in labview my requirement is to control the stepper motor in following way while pressing one button in front panel the stepper motor should run in one direction in ...
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### Problem with stepper motor and thrust bearing [closed]

I built a small electronic turntable with the following components: 1- Arduino 2- Sparkfun easy stepper driver 3- Stepper motor 4- Servocity set screw hub. 5- Thrust bearing from mcmaster-carr ...
2k views

### basic arduino question - do I need a 555 timer?

I have an Arduino (duemilanove) connected to a floppy disk drive and I can happily control the stepper motor using three pins on the ribbon cable to three digital pins of my Arduino (well 2 + the ...
294 views

### Backdriven stepper motor “powering” rest of the board

I have a stepper motor powered by a breakout board that uses the A4983 stepper motor driver (http://www.sparkfun.com/products/10735). Sometimes when the power is disconnected and the drive wheels are ...
600 views

### Need oscillating servo/stepper motor guidance

EDIT: Additional Information below original post... Looking for a 360 degree servo motor that has adjustable control for timing of steps (or at the least timing per full oscillation) and can support ...
493 views

### Best way to drive a 20 kg object on a turntable?

I need to rotate an object about 20 kg's in weight, 360 degrees. I'm thinking of using a stepper motor with some kind of rubber wheel pushing along the rim of a lazy-susan. Geared or belt solutions ...
330 views

### Stepper motor substitution

I need to find a inexpensive replacement stepper motor and I am wondering if all of the specs need to be matched or are there some that don't need to be exact. Right now they are using a six wire ...
1k views

### Create a robot arm using microcontroller

I am planning to create a robot arm using the MicroController. The robot arm should move from the angle of 0 degrees to 60 degrees. I am going to use this robot arm in my application to stop and ...
369 views

### Sourcing low torque/small stepper motors

I am looking for some small and cheap stepper motors with <10oz-in torque. Most of the steppers I can find from my regular sources/ebay are 60-1000oz-in which is far too much for my purposes (and ...
2k views

### How does the Linistepper, open source linear Stepper Motor Drive work?

I have been trying to get the Linistepper to work, however I can't seem the understand the working of the circuit. The circuit is here. The issues that I'm unclear about are: What are the ...
5k views

### Is it possible to drive a stepper motor greater than 1000 rpm?

How could I achieve this? What are the stepper motor facts and principless that I have to keep in mind to design a circuit to achive this goal? Are there any readymade/open source alternatives ...
2k views

### is there any way to determine the correct voltage for a stepper motor

I recently bought a CNC mini-mill at an auction. It is fitted with steppers on the three axis. The X and Y are the same, and the Z is a bit smaller (physically). All the markings were removed from the ...