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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36 views

How is this torque value arrived?

I'm going through this person's torque calculation of a simple crane setup. the servo used has a max torque of 57oz.in: At the top, if Mservo is 34.12oz.in, how is ...
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55 views

Rotating a lever with a small servo

I'm trying to rotate a lever link to gently "offload" a load using a servo. Here's a drawing: Here, the red is a lever, yellow pivot and black is the load. To offload, the lever needs to be turned 90 ...
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3answers
60 views

I wanna make a raspberry pi car using an RC car. I would like to know if the servo multiplexer is necessary?

So I'm working on a project and it involves making a raspberry pi car, be it from scratch or with the help of can rc car. I chose the latter. Now the problem is I don't really have servo multiplexers ...
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59 views

Serial command receiving failure with Arduino and Adafruit shield from C# desktop application

For a long time I use Arduino Uno controller and Adafruit Servo Shield with 6.3V 1000 uF capacitor, powered with 6V 8Amp adapter to control 8 digital servo motors ...
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1answer
59 views

Sizing servos for robotic arms

I am designing a robotic manipulator. The basic design is shown below. I am trying to calculate the torques around each joint to choose servo motors. I have made an attempt to find the torque around ...
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29 views

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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1answer
36 views

How to extract the servo motors of a Digital Micromirror Device?

The good news is, that modern DLP projectors are sold for a low price. Each of the projectors is equipped with a so called digital micromirror device, which is an MEMS array. It contains millions of ...
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1answer
63 views

Servo motor torque

I am confused with the torque ratings of servo motors, or I guess it is general while choosing any motor. For example a servo's torque is rated as 10kg-cm, so does that mean it can handle a 100N ...
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1answer
118 views

360 Continuous Rotation Servo only goes 180 degrees

I bought the following servo: D DOLITY High Speed 360 Degree Continuous Rotation Servo for Robotic(15kg/cm) Metal Gears Servo I'm trying to get it to spin in one direction continuously, but it looks ...
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37 views

Relation between PWM frequency and torque

I am using Pololu G2 18v15 to drive a maxon motor. The motor is supposed to drive a load in a sinusoidal trajectory against gravity with maximum torque of 0.0634 NM with max speed of 5 rpm. I am using ...
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1answer
26 views

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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1answer
292 views

How should I power my servo motor with the Adafruit PCA9685 chip?

So I have an Adafruit pca9685 controlling an HSB-9380TH servo and a MG-996R servo. I recently began learning about building robot so I apologize if these questions seem dumb. I literally spent a days ...
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26 views

Pwm settings of a Sg90 servo motor

I use a TowerPro sg90. 1.5 ms for the centre position 0 degree, and 2 ms pulse for +90 degree and -90 degree with a 1ms pulse. But it's definitely not looking like it goes for 90 degree or -90 ...
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111 views

Motor controller for two Hitec D845WP servos

I am undertaking a project using two Hitec D845WP servos running at 8.4 V. Hitec's website lists idle current of 30 mA, no load operating of 1600 mA, stall current of 10 A and ...
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47 views

3 arm robotic claw

I am attempting to design a 3 prong robotic claw for a robotic arm I am working on. I am planning to use sg90 servo motors, but I can't get my current design to work. My current layout is to use one ...
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1answer
277 views

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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881 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 ...
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2answers
120 views

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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1answer
216 views

The Arduino Turns Off After Attaching A Servo Motor

The Arduino turns off when I try to put the wire from the servo to its respective pin (9). Also, I've tried the code from the Arduino IDE, the knob code where the position of the motor depends on the ...
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1answer
209 views

Ultra Low Power servo and controller for long usage..? [closed]

So I have an idea which would require the following: 1-4 servos 1 microcontroller some way of communicating with it via smartphone (bluetooth or wifi) Ability to run for 14 days on a small power ...
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1answer
42 views

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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1answer
23 views

Motorised Stage for laser

The problem I want to be able to move the direction a laser is pointing. This means I need to have motorised rotation of the laser head in the x direction and in the y direction. I am unsure of the ...
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1answer
63 views

Can I run a servo with lower voltage?

I bought two servos (HS-5685MH) for a pan-tilt-unit and somehow didn't see that they require 6.0 to 7.4 Volts which I don't have in my current setup. I have a 5V source that could provide the power, ...
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2answers
176 views

How can I measure the torque a servo motor is applying very precisely?

Is there any cheap way to measure how hard a servo is turning? I am looking to measure changes of about 0.1 oz-in. What are the common ways to measure servo torque, how much do they cost, and how ...
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1answer
124 views

are mg996r servo failures common?

I am new to the small servo area. I bought a eBay 6DOF Robotic Arm, and 12 mg996r servos to go with it. Using an arduino and I2C PCA9685 16 X PWM board, with the example code from adafruit, I set up ...
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52 views

How to transfer motion between these two parts?

I'm trying to model this arm and I'm having a problem knowing what way could I use to make the red part always parallel to the surface of the table
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508 views

Increasing Torque by either doubling servos or building a gear box

I'm looking here for suggestions. I have a HS-805BB with Torque (Kg-cm/Oz-in): 24.7/343 @ 6.0 V to rotate a robot body up and down from one side. It seems to me that this servo is always running at ...
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2answers
42 views

How to control the speed of servo

I am using FPGA board and servo, I read that with PWM I can control where the servo will rotate. If the duty cycle in PWM is 1.5 ms it goes to the center, if it is 2 ms it goes to clockwise and if it ...
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1answer
318 views

DC servo motor shake/vibrate too much

I have a servo motor (details are here). I wrote a code in Arduino to rotate it in some defined angles and position. Code is given below: ...
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2answers
101 views

Position Sensor

During my design of a simple robotic arm, where I 3D printed most of the parts, then used these HS-422 servos, it turned out that for a better control precision and to be able to apply Inverse ...
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2answers
766 views

DC geared Motor 20 NM 25 RPM small dimensions. [closed]

My application requires a DC geared motor with torque of 10 NM - 20 NM and low speed (25 RPM at most) and a small dimensions (120 mm length at most). I failed to find my specs at eBay, and Alibaba ...
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1answer
38 views

Kollmorgen S300 drive oscillation

Robotics! We've got a rotation device controlled with Kollmorgen S300 servodrive. The official support is silent as Jesus, so I've decided to ask here instead. When it is given a task to set into a ...
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0answers
479 views

How do I choose the stepper motor torque for my robotic arm

I'm a communication engineer so my knowledge about robotics is very little. I know the basic formula of torque T=mgL in my project I have 2 arms & 2 motors i used a torque calculator online ...
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2answers
3k views

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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1answer
54 views

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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1answer
184 views

Industrial servo motor

How to control an industrial servo motor? The specific motor dive I am looking at is a Delta adsa-a2 series AC Servo Drive. I know that we can connect the motor driver to the software that the ...
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1answer
525 views

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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1answer
554 views

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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1answer
561 views

Rotate DC servo motor with ARDUINO

I have this servo motor (http://robokits.co.in/motors/high-torque-encoder-dc-servo-motor-60rpm-with-uart-i2c-ppm-drive?gclid=CLHf9_fCqNQCFVAeaAodhM0Ddg&). Generally, I have seen servo motor with ...
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1answer
333 views

Connecting two servo motors to drive one shaft [closed]

I need to connect two servo motors (with internal position control) to rotate one shaft (to control its position), is that possible? and how to avoid synchronization problems? the servo motor I am ...
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1answer
355 views

How to remove sound comming from servo motor?

When ever i move the servo motors from the arduino, it produces sound. I don't want the servos to make this sound. How can i remove this sound. As i think this sound must be coming from the gears used ...
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4answers
18k views

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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1answer
582 views

Why are some motor shafts stiff while others spin freely when not powered?

Most servos and steppers I've worked with are able to spin manually when no power is applied, but I've come across a couple which are stuck in their position. I'm not sure if they are just very ...
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2answers
938 views

Mounting on servo horn

I'm trying to mount a rod on a micro servo's horn. The horn has several 1mm wide through holes. Does anyone know what sort of (tapping?) screws should be used for tapping 1mm plastic holes? Are M1.2 ...
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1answer
643 views

How do you make a device that can pick up nerve signals? [closed]

I am trying to make a robotic arm that mimics the movement of the user's arm, They way I need it to work is to detect nerve signals and send them to an arduino. The arduino would then have a servo ...
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1answer
655 views

Can an arduino control a large servo motor?

A I wanting to build a robotic hand, a big one at that. Similar to this one but in a much larger scale: http://www.instructables.com/id/DIY-Robotic-Hand-Controlled-by-a-Glove-and-Arduino/ Does it ...
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2answers
348 views

Is the working principle of all servo motors the same?

If I can control a small hobby servo motor then can I control high torque servo motor in same way? I want to make a robot which needs a high torque and speed motors. But first before buying some ...
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1answer
94 views

1 motor and 180 degree servo or just 2 motors?

I am planning to use this motor: http://www.adrirobot.it/robot_kit/feetech_FT-DC-002/TGP01D-A130_TT-Motor.pdf Model: TGP01DA130 12215-48. But I have some questions: How much a robot will be slower if ...
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1answer
662 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?
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3answers
294 views

What exactly does a motor driver do ? Why do we need additional power supply for motors

What exactly does a motor driver do ? Why do we need additional power supply for motors. I'm a hobbyist. making a line follower from scratch.