Questions tagged [servomotor]
A servomotor is a closed-loop servomechanism, typically used in industrial applications. It usually consists of a motor coupled to a sensor (e.g. encoder) for precision position feedback, typically using a low ratio gearbox or direct drive.
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Should I switch my servo system from brushed to brushless motors?
I have a robot that uses brushed motors in its servo system. These are Maxon 3W motors, with 131:1 planetary gearboxes. The motors are controlled by a PIC microcontroller, running a 1kHz PID ...
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How to use Arduino for ESC control?
I am using an Arduino Uno to control an ESC for my (in progress) quadrocopter. I am currently using the servo library to control the ESC, which works great.
Except..
A count of 100 is max speed, ...
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Do servo motor specifications take into account the gear ratio inside?
I am looking at buying a servo motor for a an application that must be able to lift 4-5 lb at a rotational speed of approximately 1rpm. The servo motor listed here http://www.robotshop.com/ca/en/hitec-...
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Servo horn dimensions - What is 25T?
I wonder that horns for servos are marked in some T units. Example: 25T
Please help me getting out, what does it mean.
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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 ...
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Finding a light load high precision servo motor
I have a project that requires me to be able to accurately and repeatedly rotate an object 120 degrees.
The object is small and lightweight (let's say several grams). The axis does not necessarily ...
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For robot wheel control : Brushless DC motor or Servo Motor?
Simply, when to use brushless dc motor and when to use Servo Motor ?
what are the differences , specially when adding an encoder to the dc motor you can have the position and it will be similar to ...
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Lifting robotic leg with only one servo
Note before I start: I have not actually put anything together yet, i'm still just planning, so any changes that require a shape change or anything like that are accepted.
I'm working on making a ...
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Is a thrift store a good place to get a servo motor?
I'm trying to learn about a very basic motor, the servo motor. Can these be found a thrift stores like Goodwill in old toys? Are these "robotic" quality? What toys or other kinds of things would I ...
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Robotic arm select servo motors
Hi i´m designing a robotic arm based on this idea of the NOVABOT I only want to change its structural parts by aluminum tubes. In this design 3D model it use the servo hs-311 wish have a max torque of ...
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Controlling digital servos
Many websites say that analog servo motors work on 50Hz and digital servo motors work on 300Hz. My question is, does this difference apply only to the inner control loop of the servo or does the user ...
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Up to what force is a servo motor a reasonable choice as an actuator?
I'm working on an application where I need to apply a linear or angular force to operate a linkage mechanism, but I don't (yet) know what amount of force I will need. I anticipate that it will be less ...
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Can I control more than 18 servo motor with a Raspberry Pi
I'm trying to make an hexapod with 18 servo motors and i'm asking how to control them with a Raspberry Pi. (Never used it). I saw lot's of stuff to control 1, but 18, 20...
Currently I'm working on ...
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Can we simulate a actuator with a very strong torque with a PID controller
I use gazebo to simulate a robot arm. To control its joints, I use PID controllers. As you might know, PID are sometimes pretty hard to tune and this is the case for a robotic arm. To avoid any tuning,...
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Should the therotical parameters match the physical setup constraints when modeling a robot?
I'm working on modeling and simulation of robotic arm, after I obtained the mathematical model of the robot, I used that to implement some control techniques, to control the motion of the robot. The ...
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How Can I Measure the torque applied by a servo motor?
I believe that there must be a tool that can measure $oz-in$ of torque. I do not trust what the servo manufacturers state on their site for torque values, so I want to test them for myself.
Can ...
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Best way to estimate velocity of motor with encoder
I'm designing a PMSM controller with the motor has an optical encoder, so I can get position information from the motor. But how to measure the velocity of the motor. Now, my design is to calculate ...
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How to program a continuous servo motor? (Arduino)
I need to use continuously rotating servo for a camera stabilization system. My professor bought servos that have already been modified for continuous motion--there's no stop in the gears, and the ...
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How to attach plate to stepper motor?
Total noob here (never touched Arduino before today), & have pretty much no hands-on technical experience (although with lack of experience, I make up in enthusiasm to learn!)
Question: How do you ...
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Electronic Speed Control Concepts
I am a programmer who has never worked with electronics before. I am learning the concepts and hoping to build a quadcopter, with the control software entirely written by me. Motor control seems to be ...
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High Res Rotary Encoders [closed]
As part of a project I need an encoder to determine the angle that this, Continuous Rotation Servo - FeeTech FS5103R, has rotated through. The resolution needs to be fairly high as I will be using it ...
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Choice of a motor for robotic arm
This is my first post here, so hello all. I really hope I can learn a lot from you guys.
I am trying to build a robotic arm to carry an object and put it inside of different boxes that are placed in ...
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How does the "rated torque" for a gear relate to the maximum torque?
I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
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Stated power for a motor does not equal nominal voltage x current?
I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
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Choosing DC motor: max needed torque vs nominal torque
I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
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Steering using different speeds in DC motors or using a servo?
I am trying to assess the pros and cons of steering a robot car using different speeds of 2 or more DC motors versus using a servo and a steering mechanism? From your experience which is better in ...
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Measure weight of an object using a servo
Assuming a quality industrial servo, would it possible to calculate the weight/resistance of a load? Maybe by comparing current draw in a holding position, or by the time it takes to lift/lower an ...
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Servo Starts Oscillating Under Disturbance
I'm using MG996R servos to control a 6-axis desktop robot arm. When no disturbance (like a gentle push to the robot), the servos are fine and can hold their places. But under a gentle disturbance, ...
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How to choose a servo motor for solar tracking mechanism?
I design a solar tracking mechanisim. You can see the very undetailed representation in the pic. For choosing a servo motor how can I calculate the torque etc?
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How to control the position of a load shared between two (servo)motors?
I want to position-control an axis combining the action of two DC servomotors - one of them alone is not powerful enough; I had those available and preferred not to buy a new one.
I have not the ...
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Encoder attached to output of gearbox of stepper motor
I'm building a SCARA robot controlled with stepper motors and want to use an encoder to close the loop. The main reason for this is I am using an experimental gearbox with nonlinearities and zero ...
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18 MG996R servo motors control and power
I am currently working an a personal hexapod robot project. I am building it using 18 MG996R 4.8 to 7.2 V servo motors. I would like to use a Raspberry Pi 3 B+ to control it. I purchased a 7.4&...
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Calculating screw breakaway torque
I'm trying to use motor-sizing tool developed by oriental motor to choose good servo motor for my cnc
The tool requires breakaway torque of my screw as input, I searched online but I got people ...
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Why does it require more force to turn a servo if it is electronically connected to another servo?
I have two servo motors that I rigged up to use as a telescope remote focuser. The idea is to turn one servo by hand and use the power generated to turn the other, which is geared to a telescope ...
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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 ...
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I've got a few servo motor questions
How can I measure the amount of voltage I'm giving a servo motor? How can I give a servo motor the correct amount of power it needs to run at it's full potential? Say I had this motor:
ANNIMOS 60KG ...
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Is it possible to calculate the gear reduction based on datasheet of SG90?
is it possible to calculate gear reduction based on the datasheet of SG90 servo motor? Because I wanted to do some modeling in Simulink and RC servo ask for gear reduction, but I can't find any ...
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Torque control and monitoring of servo
I am trying to control the servo motor operation by torque control by interfacing the sensor to an avr , which will continuously monitor the torque value from the sensor and control the torque ...
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Why are the IRB 1410's servos running even when the joints are not moving?
I was jogging the ABB IRB1410 and I noticed that the servo motors are humming even when the joints are not moving. The motor cuts off only when the guard switch in the flex pendant is released.
What ...
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Floppy fish mechanism design
I've bought a floppy fish toy (crab version) for my kid. The toy looks like:
Unfortunately, the toy mechanism inside jams when grabbed and the battery lasts for a short time:
I tried to do my own ...
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cable-controlled flexion and extension
I'm new, please be gentle :-)
I'd like to control the position of a single-axis joint using one cable for flexion and another for extension.
In many of the anthropomorphic designs I've seen each of ...
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Driving Rhino DC servo motor using Arduino through commands sending from MATLAB
I have a servo motor (http://robokits.download/documentation/RMCS220x_DCServo_Driver.pdf). I wrote a code in Arduino to rotate it in some defined angles and position. Code is given below:
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Selecting a gear reduction: torque vs speed
I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
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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 ...
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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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How to calculate the right needed Power?
Me and my team are building a robot and I need to calculate the Power of the motors. Through my research I found that I must know the needed torque for every motor and then convert it to electrical ...
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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?
user14148
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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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Powering 6 servomotors requiring 6V and 2A each
The title pretty much says it all. I'm on a team that is currently building a robotic arm for the capstone project of my engineering degree, our design is similar to the Dobot (5 degrees of freedom). ...
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How can such a small motor produce so much torque?
I have only recently gotten into robotics - so I'm not that familiar - please excuse me if this is a silly question.
I was looking at servo and stepper motors. I can see that a lot of servo motors ...
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