Questions tagged [stepper-motor]

A stepper motor (or step motor) is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can then be commanded to move and hold at one of these steps without any feedback sensor (an open-loop controller), as long as the motor is carefully sized to the application. (Wikipedia, 2014)

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16
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5answers
26k views

How to detect when a stepper motor has stalled?

How can I detect when a stepper motor has stalled? A google search led me to some people who say that when the stepper motor stalls, the current spikes up, which is easily detectable with a Hall ...
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3answers
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Can RC servo motors continually rotate?

I know that RC servo motors are designed for precise movement, rather than a D.C. motor's continual rotation. Are most RC servo motors limited to movement within one rotation or can they actually be ...
9
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1answer
744 views

How can I optimise control parameters for a stepper motor?

As an industrial roboticist I spent most of my time working with robots and machines which used brushless DC motors or linear motors, so I have lots of experience tuning PID parameters for those ...
8
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1answer
1k views

For servos, can it be implied that `Holding Torque = Operating Torque * 2` like with steppers?

I am following a guide that recommends using stepper motors and it has an approximate holding and operating torque. It says that if you don't know the operating torque, it is often half of the holding ...
7
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1answer
2k views

Using an Arduino to control an ON / OFF connection between two pins

I've got this driver: http://www.pololu.com/catalog/product/1182 ... a A4988 stepper motor driver carrier I'm attempting to control a connection between the RESET and SLEEP pins with logic ( code ) ...
7
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2answers
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How to tell a stepper motor's position, or detect slippage

I am creating a CNC machine on a budget, using old motors out of printers/scanners/etc. I am limited to about 650mA for the whole system, so my fear is that when the cutting bit touches the material,...
6
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3answers
306 views

WHY are there no operating torque specifications on steppers?

I have been looking online for a while, and I cannot seem to find any steppers without any torque ratings. (Operating torque, not holding torque.) I even looked on hobby sites that usually have all ...
6
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4answers
23k views

How much torque do I need for a CNC machine?

I have a handful of 31.2oz-in stepper motors (Mouser.com - Applied Motion: HT17-268D), and I was curious if they would be big enough to run a 3D printing/cutting/etching type (think RepRap) of machine....
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5answers
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Is it possible to run multiple loops at the same time? (Arduino)

I've got a code where I have a motor running back and forth and buttons connected to a scanner, when I press the buttons it causes the motor to stop and over rides it. I would like them to run ...
5
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2answers
4k views

Mechanical design for motorized spherical caster wheels

Design goal is to have a mobile robot that operates on 3 large casters, essentially 2 to 4 inch diameter steel ball bearings, that are motorized. No other mechanism would touch the surface. The robot ...
5
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3answers
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2DOF arm with quick movement: Stepper, servo, or DC motor?

To make a two degree of freedom arm capable of speeds needed to play air hockey, how should the arm be controlled? I'm wondering about speed vs accuracy. The following image is from a project ...
5
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1answer
4k views

Will wiring a unipolar stepper to a bipolar stepper driver decrease the holding torque?

I have read that you can wire a unipolar stepper to a bipolar driver, which I have, by ignoring the two extra wires. One concern I have is whether connecting a unipolar stepper to a bipolar driver ...
4
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2answers
5k views

Using brushless motors for very high torque

I'm currently building an robotic arm and I want the elbow joint to be comparable to a human one But here's the problem, electric linear actuators are too slow and have low torque, same goes with ...
4
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2answers
476 views

Struggling to understand Jacobian Inverse Kinematics

I'm trying to find a method to control a moveo 5dof arm. My goal is to calculate the right angle to turn for each stepper motor to reach a desired point in real environment. I've spent time looking at ...
4
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2answers
734 views

What is the required theory behind building a robotic arm?

I am currently planning on building a robotic arm. The arm's specs are as follows: 3 'arms' with two servos each (to move the next arm) single servo clamp mounted on revolving turntable turntable ...
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3answers
4k views

How can we manage stepper motor cables?

I need to actuate 3 or 4 Cnc-like Nema 23 (~1N.m torque) stepper motors, I would like some cable solution to connect easily the motor to the motor driver. I have not yet bought anything, I have ...
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3answers
5k views

I want my stepper motor to switch speed while traveling (not acceleration wise)

I have this project I'm working on where I'll need the speed of the stepper motor to change set speed at a certain distance, I just can't figure out a way to do it. I'm using arduino and a stepper ...
3
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2answers
543 views

Rotate (and stop) a large disk in very tiny increments

In a lab build I'm doing, I'm stuck at this problem, so I am fishing for suggestions. I'm creating a turn-table type setup where I need to make readings (with a nanotube-tip probe I've already ...
3
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3answers
14k views

Torque in kg/cm?

I was looking up the motor parameters for some stepper motor where they listed the torque of the motor at different current/voltage but the torque they listed was in kg/cm. How is kg/cm even a ...
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1answer
1k views

How does Fliike Smiirl counter mechanism work

First of all please see this video : http://www.youtube.com/watch?v=n0dkn4ZIQVg I think there is ony one stepper motor -or servo- working in the mechanisim. But as you can see each flip counter works ...
3
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1answer
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Why does microstepping give less torque?

I am experimenting with using a stepper motor for a robotics project. I'd like to use microstepping to give a better resolution and smoother movement, but I have noticed that the finer the microsteps, ...
3
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1answer
7k views

Choosing correct power supply for Stepper Motors

I am building a machine and need 2 Stepper Motor for that. The motors are driven using by a 3.3v arm device. I have made the following selections regarding the stepper motor, stepper motor driver and ...
3
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2answers
536 views

4dof or 5dof robot arm with stepper motors tool-chain for an hobbyist

In the past I built some simple robot arms at home, using RC servo motors or stepper motors (till 3dof). I would like to build a new arm with 4dof or 5dof with the steppers. Until now I used Arduino ...
3
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1answer
692 views

Linear slider motor mount location - Pros/cons

I'm currently designing a linear camera slider, that will be used to hold camera equipment weighing just about 15 Kgs including all of the lenses and monitors and everything else. For those who don't ...
3
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1answer
702 views

CNC stepper motors are loud and slow after decreasing the steps/mm from 250 to 5

I'm making a drawing robot and have hooked up my steppers to each axis. I'm using the grbl shield with arduino and nema 17 steppers. Initially the firmware was set at 250 steps/mm but with my setup ...
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2answers
1k views

What are the equations of a s-curve position path?

I have a decoupled mechatronic system with two motors. I want for each motor to give a s-curve path as reference. You can see in the image below the position path, velocity and acceleration. All ...
2
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2answers
87 views

How can I draw a line using rotation of two circles?

I’m building a drawbot with a self imposed constraint that it’s method of motion is just two rotating disks. One holding the paper and one holding the pen. However, the math to calculate the right ...
2
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1answer
341 views

RC car circuit: what does it do?

I have just disassembled a RC car (a BBR 1:18 Scale Ferrari Enzo from 2005). Attached to the stepper motor that controls the steering of the car was a small circuit board with a cog wheel attached to ...
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2answers
5k views

What is required to build a simple XY-stage?

In the scope of my PhD, I would like to build an automated microscopy set-up that should take images of a sample of 2cm by 2cm. This should be done by taking pictures of 500 micrometers by 500 ...
2
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3answers
634 views

Sun tracking with +/- 0.1degree accuracy?

For a school project I am looking to track the sun with +/- 0.1 degree accuracy for use with a parabolic dish reflector. Say we need a final output torque of about 20Nm, what kind of gearing/motors ...
2
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1answer
161 views

Current-limiting stepper motors for RepRap

I have been working on a robot project for a while. Now I am tired of finding parts that just does the job, so it is time to do create parts. A 3D printer will do the trick for many parts, but 3D ...
2
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1answer
43 views

Stepper drive resolution

I'm asking for help on understanding stepper motor + gearbox solution, as I've got totally confused during my research on topic. Story: Trying to make a sort of precise turning table (at least 1°/...
2
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1answer
44 views

Driving a gearbox with another?

I'm trying to find a 1:1000 gearbox for NEMA 17, but the highest (affordable) one I've found is 1:100. Is it a good idea to drive a 1:100 planetary gearbox with a 1:10 planetary box? Is it common to ...
2
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1answer
533 views

How to calculate power supply requirements for Closed Loop Stepper Motors?

I have a CNC Router table that has 4 Nema 23 stepper motor (open loop). I want to upgrade the machine and use 4 Neam 34 Closed Loop Steppers. These are the motors and drivers I'm considering: Steppers:...
2
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1answer
37 views

Going around Voltage Limitation on Battery for Steppers?

Am building a device that will use two stepper motors and a servo. One of the main requirements, is that the on-board battery cannot exceed 9.6 volts. The stepper motors have not been picked yet, and ...
2
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2answers
884 views

What kind of torque is needed for a small 5-6 axis robotic arm?

I'm new to robotics and I'm looking to make a 5-6 axis robotic arm out of stepper motors but I honestly don't know how much torque I should have for each part. Below I have described in more detail ...
2
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1answer
6k views

What motor to use for reciprocating (reversive) movement [closed]

I want to make a copy of this machine Fisher Price Soothing Motions™ Glider and I'm wondering what motor to use? Simple DC motor with appropriate gearbox (slow rpm) or stepper motor? Here is another ...
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4answers
459 views

Passing power through a motor

How would one go about passing power through a motor? Let's say we have some basic robot which has a motor that slowly spins a limb, on each end of that limb, there is a motor which again spins a ...
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2answers
868 views

How to reduce the small free rotation/movement of a stepper motor shaft?

I was successful in running a 28BYj-48 stepper motor with 4096 steps per revolution. I am happy with the result. But there is a free movement of the motor shaft itself - you can move the motor shaft ...
1
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1answer
80 views

Choosing stepper motor for hand

I'm developing a robotic hand, and decided to place motors inside joints (as in picture) and I'm stuck with finding a stepper motor that can fit there. Approximate size of motor body is radius - 10mm, ...
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3answers
544 views

How can I increase the resolution of a PWM signal?

Say I have a motor and I want it to spin at exactly 2042.8878 revolutions per minute. Say I have a very precise sensor to detect the RPM of the motor to a resolution of 1/1000th of a revolution per ...
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2answers
752 views

Building industrial-like robotic arm

I would like to build a 70cm articulated robotic arm (not a scara one) that can lift between 10kg and 15kg (10kg would be awesome already, this payload includes the weight of the arm+gripper) and ...
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1answer
568 views

Which kind of motors and how powerfull should they be for a robotic arm

I am building a robotic arm with these specifications: 1 meter long approx. 1kg weight it is made of 4 motors. (2 at the base. One for rotating the whole arm left and right and another one for ...
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2answers
218 views

How to know what type of stepper motors to use when designing a robot [closed]

I am talking about robots like this one: http://www.meccanotec.com/step781b.JPG How would a person know what type of motor to use in design of such a robot? What I want to understand is that stepper ...
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1answer
28 views

Stepper Motor: Direct Drive vs. Belt Drive vs. Geared Stepper Motor

I have built a juggling machine. Each arm is driven by a 4A 23mm stepper motor. The motors are each driven by a TB6600 set to 800 microsteps. By trial and error, I have found that the motors skip when ...
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1answer
49 views

How to make a CNC machine from scratch?

I want to make my own CNC machine from scratch because it's cheaper to make than buy a premade one. I noticed that some machines go for tens of thousands of dollars and I cannot understand how they ...
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2answers
87 views

Why are brushless servos more common than steppers in Cobots?

Essentially every cobot I've worked with uses BLDCs instead of stepper motors in the joints. When searching for answers as to why I see a lot of posts that suggest one or the other, but nothing ...
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2answers
5k views

How can I calculate speed and torque of stepper motor screw

I want to choose stepper motor screw with slider for use it to shift cube with side 5 cm and wight 250 g . I found this motor .. how can I calculate speed and torque of slider
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2answers
1k views

What stepper motor driver to use?

I want to control a DVD drive's stepper motor with an arduino uno, but at the moment I'm not sure what kind of motor driver will work for that. I am currently looking at this one I have no idea ...
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2answers
80 views

What is the best way to plug in more than 3 stepper motors into a Arduino Uno board?

I'm developing a 5 axis robotic arm with stepper motors and I am getting around to ordering most of my parts. I plan on using 5 EasyDriver shields to drive all of my motors. I am also planning on ...