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Questions tagged [actuator]

A motor, not necessarily electric, which converts energy into some kind of motion.

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Fabrication of Planar HASEL soft actuators

Recently, I was researching planar HASEL actuators to create artificial muscles. I was greatly inspired by the YouTube video "HASEL actuators with muscle-like performance." I found the paper ...
Daniel García's user avatar
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1 answer
29 views

How can position control be achieved using dielectric elastomer actuators?

Electric motors/servo motors can easily make position control using an encoder and manipulating the phases of the motor, but a Dielectric Elastomer Actuator can only activate and disactivate as far as ...
Fulano's user avatar
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Controlling motion of single link

This seems like it should have been a well studied problem, but I can't find any solution. We want to define what a motor must be commanded to do to move a single link with mass $m$ and length $l$ $...
guero64's user avatar
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1 answer
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Applying raw torques to joints in Gazebo simulation

I have a 7dof arm that I want to simulate, and the experiment requires me to be able to apply torques to the 7 servomotors (actuators) in the simulation. I would like to know how I can set up "...
Priyam Panchal's user avatar
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31 views

Barrel with slot, that can slide

Image sourced from: Huygens optics YouTube channel : Maskless Wafer Stepper Part 2: Mechanics @ 7:40 I need to couple a stepper motor to a leadscrew that will be translating back and forth. One ...
Ansh's user avatar
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1 vote
1 answer
128 views

Is it worth designing your own components to mount a ball screw?

As explained here I would like to build a MakerArm / Dobot M1 like robotic ARM (SCARA) that can lift few kgs (< 10kg for sure) using a ball screw for the translation on the Z axis. Right now I ...
LiohAu's user avatar
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1 answer
170 views

How to design shafts and select bearings

I am trying to design robotic joints for a SCARA arm, I am mainly missing information about the shaft and bearings components. Design would be similar to MakerArm / Dobot M1 kickstarter projects. So ...
LiohAu's user avatar
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Determine the maximum joint velocities for a PTP-Movement

Assuming an industrial robot performs a PTP movement with a speed of 100% for each joint, it often happens that the joints never reach 100% of speed because the torque limits of the actuators are ...
Afrobeta's user avatar
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1 answer
14 views

Principal approach to control force of an electrically driven friction based griper

I would like to build a gripper that can pick and place irregularly shaped objects, for example, vegetables. I'd like to grasp the object with enough force so that it does not slip form the jaws, but ...
psarka's user avatar
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1 answer
55 views

How to maximize top speed potential for a given motor? [closed]

I have an engineering background however I am new to motors. I am looking to understand what the options exist for maximizing the top speed a motor can produce (say for an RC vehicle) without simply ...
tniles's user avatar
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1 answer
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What type of actuators are needed for a high accuracy, low load weight robotic arm?

I am trying to build a robotic arm that needs to lift a very low amount of weight (between 0.01-0.05kg) at a time, but it needs to be very precise (+/- 1mm accuracy ideally). The robot really only ...
Skrish's user avatar
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2 answers
188 views

What are the pros and cons of Zip Chain Actuators in robotics? [closed]

Well, I just found out about these Zipper Chain Linear Actuators, but I couldn't find much information comparing these types to other types of actuators. For example, what is the performance of Zip ...
Fulano's user avatar
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1 answer
56 views

Can you increase resolution/accuracy by mechanically averaging two actuators?

I'm working on a project using hobby servos to drive a revolute joint, and the servo mechanism doesn't seem to respond when I command a motion of less than about 1 degree. I want to increase the ...
drsimonz's user avatar
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1 answer
62 views

What are the materials and methods used to build ROMAC artificial air-muscles?

So, I was reading about pneumatic artificial muscles, and to my surprise I found that there is a lot of types of air-muscles. One that called my attention was ROMAC artificial muscle: In this article ...
Fulano's user avatar
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1 answer
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I'm trying to understand an equation from a motor simulation $\dot w_i (u_ i ​ ,w_i,l _i ​ , \dot l _ i ​ )$

I have a simulated motor and I'm not understanding the math to control it. This is the equation for the force of the motor, also called an 'actuator'. $\dot w_i (u_ i ​ ,w_i,l _i ​ , \dot l _ i ​ )$ w ...
Ant's user avatar
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0 answers
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What inertial information can I get from a SolidWorks object for simulation in MuJoCo?

MuJoCo needs me to enter the position of the inertial frame and the diagonal of the inertial matrix, (if I understand correctly). I'm not sure how to get this information from SolidWorks. This object ...
Ant's user avatar
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131 views

How can I feel feedback with electric power steering (EPS)?

When I am rotating steering wheel and it meets an obstacle, I feel it. I have EPS. How does it work? Is it just explicit sensor and feedback? Can I sniff this feedback on CAN bus?
Dims's user avatar
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1 answer
214 views

Why Hydraulics and Not Motors?

I have noticed everywhere that professional robotics companies use hydraulics over electric motors. I want to know why that is. Why can they make custom electric motors that are really powerful. ...
DragonflyRobotics's user avatar
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Simple plastic welding machine

I'm doing a little hobby project where I want to weld two thin plastic sheets together, using two heated plates with a specific pattern. I was doing this manually but felt that the result was ...
user26553's user avatar
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63 views

Need help regarding electromagnetic suspension implementation

I an trying to implement an electromagnetic suspension system on model/small scale (like the bose suspension system in this video: https://youtu.be/3KPYIaks1UY). Upon doing some research on this topic,...
0xVikas's user avatar
1 vote
2 answers
103 views

How to determine actuator and process for PID, and how to intepret the output

Imagine there is a web service (let's say Twitter) that handles tons of requests from around the world. I want to figure out how to let the web service pick a certain amount of (let's say 1 billion) ...
yiksanchan's user avatar
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1 answer
58 views

Output power of an actuator - General definition

I'm looking for a general definition of the output power of an actuator. Can you suggest me any book or paper or education website where I can find it please? Thank you in advance. EDIT I read the ...
Gennaro Arguzzi's user avatar
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1 answer
211 views

Controlling Actuated Robot Hand in Underactuated Manner

We have an allegro hand in our robot, and it is in actuated behavior. In other words, each joint is controlled one or more than one actuator, that is motor. There are 3 actuators for each finger, ...
Goktug's user avatar
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2 answers
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What is the typical intro example for control systems for a spherical joint?

I have been studying Acrobot and Cart-Pole. Both of these systems I can both work out the equations of motion and linear manipulator equations for how to maintain the poles vertically. The problem ...
Stan Shunpike's user avatar
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2 answers
475 views

Calculate the inertia matrix of complex robotic mechanism

Motor, irregular rigid body of Different materials Forming a single robotic. For example, Industrial robot, every geometric shape of the link is very complex. But we can find inertia matrix form CAD ...
lumw's user avatar
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1 answer
54 views

Design a robot that can apply hot glue to paper

I need to automate a process that involves applying hot glue to paper. I own a standard handheld hot glue gun, like this one: Sticks of room-temperature glue are fed in the right side. Pulling the ...
CreatedByBrett's user avatar
1 vote
1 answer
37 views

How to balance a long vertical bar

I have a mobile base (1400x1800x400 mm) which has a vertical bar (1) mounted on its geometric center; this vertical bar has a length of 2500 mm and a diameter of 100 mm and I need to keep it always in ...
Marcus Barnet's user avatar
1 vote
1 answer
256 views

Does MIT Cheetah uses Series Elastic Actuator?

I have been wondering does MIT cheetah purely only use electrical active compliance on it's robot or did they use a Series elastic actuator since they have this webbing tendon?
shafiyyah's user avatar
2 votes
1 answer
3k views

What servos are suitable for a robot like Boston Dynamics’ Atlas?

I have seen Boston Dynamics’ robot Atlas do some pretty impressive things, like a backflip, which must put quite large torques on the servomotors. What servos are there that can generate torques like ...
HelloGoodbye's user avatar
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1 answer
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Actuators used with 2d laser scanners to produce 3D images on ROS

Hi, The acquisition of 3D LIDAR is mainly based on the rotation of the 2D laser scanner around a certain axis. I mean a standard 2D laser scanner and mechanical rotational element are required for 3D ...
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1 answer
119 views

What do the model numbers in Harmonic Drive gear drives represent?

According to one of their brochures, Harmonic Drive numbers their models with numbers like 8, 11, 14, 17, etc. I noticed that Chinese suppliers like Laifaul have a similar numbering scheme, though it ...
guero64's user avatar
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0 votes
3 answers
645 views

Potentiometer as pressure sensor in linear actuator?

I'm trying to use a linear actuator (sample electric cylinder) for a soil penetration device. Originally, I thought of using a pressure sensor to know when/if I hit a rock. However, I am not seeing ...
Yevheniya Kupchyk's user avatar
2 votes
1 answer
89 views

What is an "actuation state"

The paper A Feedforward Control Approach to the Local Navigation Problem for Autonomous Vehicles by Alonzo Kelly uses the term actuation space. Feedforward solves the historically significant ...
andrewgazelka's user avatar
5 votes
1 answer
827 views

How can a coaxial stepper motor be used to drive the Z axis effector of a SCARA robot?

I am new to robotics and mechanical engineering. I am trying to understand how the Z-axis (and effector) of a SCARA robot can be driven by a stepper motor with it's shaft coaxially aligned along the ...
user391339's user avatar
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1 answer
20 views

What's a good stepper motor to use with ROS?

I'm looking for a stepper motor w/encoder that works with ROS. Does anyone know of a good one that has documentation about how to use it with ROS? Thanks in advance. Originally posted by CodeMade on ...
user avatar
0 votes
1 answer
69 views

State of the art trajectory for fine precision robots

Which kind of trajectory would one use for a fine precision robot? I know trapezoidal and cubic trajectories, but errors get very high when stopping at every configuration and when speeding up to ...
kassio's user avatar
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1 vote
1 answer
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Suggestions for a rotational actuator [closed]

I am looking for a rotational actuator with high torque and one whose rotation angle can be controlled using the arduino control signals The project is an e-brake for an e-bike. Working mechanism ...
Suhas's user avatar
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1 vote
2 answers
212 views

Rotary Serial Elastic Actuator

I'm building a 7oF arm with series elastic compliant joints. I need series elasticity because I'm training the robot to do autonomous manipulation using machine learning, and I want force control (and ...
Tarrare's user avatar
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1 vote
1 answer
91 views

Replace screws with motors!

I am new to this space and the field. Please pardon my lack of intuition or knowledge. I have a recording stand with a join in between. a pair of screws through which the whole apparatus pivots like a ...
Shawn Arthur's user avatar
1 vote
1 answer
450 views

Telescoping linear actuator [closed]

I need to find a linear actuator that can extend to multiple times it's length. I am going to be fixing the actuator horizontally and it will carry a light vertical load. So far I have thought of ...
nshoo's user avatar
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0 votes
1 answer
43 views

Electronic Spring Vibrating Spheres

For a science project, I'm looking for a way to actuate a spring, connecting two ~ 1 cm Styrofoam spheres to each other, at frequencies around 1-60 Hz. In other words, I want to be able vibrate 2 ...
PFD's user avatar
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0 votes
1 answer
197 views

Control method of large linear actuator [closed]

I have a Large linear actuator from Hiwin, the serial number is LAS3-1-1-500-24GE. the data sheet for the LAS3 can be seen on page 18 of the following link: http://www.hiwin.com/pdf/linear_actuators....
Nathan Higgins's user avatar
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2 answers
166 views

Are scissors what I want for moving straight up and out?

I'm a programmer. I had a tiny amount of experience building robots in college a few years ago, but haven't done anything since. I'd like to build a robot that can move around my house, pick items up ...
ArtOfWarfare's user avatar
1 vote
2 answers
2k views

Which motors are used in boston spot robot

I want to know which motors or smart servos are used in boston dynamics spot robot. Where can i read its spicification and is it possible to buy the motor?
user avatar
0 votes
1 answer
444 views

motor to turn a screw to move a lever [closed]

Where I can buy an actuator that consists of a motor that turns a screw that moves a rod?
Software Framework's user avatar
1 vote
2 answers
136 views

How can I turn a bowl/glass upside down?

I want to dispense water/cut-vegetables from a glass/bowl(240 ml) by turning it upside down. The screencast shows the idea: I can directly mount the clamp on a servo motor, but I think that will be a ...
Apoorv's user avatar
  • 11
0 votes
1 answer
69 views

Plug & play motors, actuators and drivers system

I was wondering if anyone knew of any easy-to-use plug and play systems, that allow you to build and programme a number of actuators and motors quickly and easily? I'm thinking something like Lego ...
Eddie's user avatar
  • 3
0 votes
1 answer
242 views

Converting a differential equation into its Laplace transform

Given the differential equation of a current controlled electric actuator, how would I convert the differential equation into its Laplace transform? $$ J \frac{d^2 \phi(t)}{dt^2} + D \frac{d \phi(t)}{...
johnmeehan2013's user avatar
0 votes
1 answer
81 views

How to get started on making a dispenser for Indian spices?

I want to make a dispenser system for Indian spices. Dispense in multiple of teaspoons (5 ml) Handle powdered spices and small seeds like mustard/cumin I ordered a spice carousel from amazon and ...
Apoorv's user avatar
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5 votes
3 answers
1k views

What types of actuators do these industrial bots use?

I have a particular example robot that interests me: http://www.scmp.com/tech/innovation/article/1829834/foxconns-foxbot-army-close-hitting-chinese-market-track-meet-30-cent See first image, the ...
JDS's user avatar
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