Questions tagged [servo]

A kind of motor with automatic feedback, such as a hobby RC servo.

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41 views

State Space model of a positional servo system. What are these parameters?

I am trying to solve a problem related to state space modelling of a positional servo system. I am stuck in the last part of the question. The full questoin is shown below: The following question ...
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27 views

Calibrating FEETECH FR5311M Digital Servo

Hey everyone, I am owning this model feetch servo motor. I want to do the following:(with arduino uno) Read the initial position(angle) of the servo motor rotate the motor to desired position(angle) ...
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34 views

Stall torque for servo

My understanding of stall torque is that it's the amount of torque produced by the servo when the output is stationary. Suppose the stall torque of a servo was 10kg-cm. It can lift the a 10kg load at ...
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54 views

+-10v input motor driver

I have a servo controller that outputs a +-10 V velocity command for a motor. How can I take this signal and turn it into a pair of PWM outputs to drive an H-bridge? A value of 0 to 10 V will ...
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73 views

How does the magnetic field in a servo motor acts according to the PWM signal?

I have read about servo motors but have problem grasping the main idea of obtaining fixed position by the magnetic field. The servo motor position is said to be controlled by PWM signal. And a toy DC ...
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37 views

How does a servo amplifier with Step/Dir Interface calculate feed-forward terms?

My Question is related only to servo systems that still use step/dir as input. Consider a typical advanced servo loop of an amplifier in the figure below: (source: "Mechatronics system Control and ...
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90 views

Servo motor too noisy [closed]

I’m currently using a Hitec HS-645MG servo to swing a piece of thick piano wire approximately 2ft long in a 180 degree arc. Servo being controlled via Arduino. It needs to swing back and forth ...
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30 views

How to power multiple Wemos D1 Mini

I’m planning on making my bay window blinds tilt automatically with Alexa. I've done plenty of research but can’t find my answers, hence the question. I have 4 individuals blinds which all need ...
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141 views

How twitchy are larger digital servo motors?

In my servo-driven pen-plotter project, I have been experimenting with various different servos to discover more about their characteristics. In practice I have found that: analog micro servo motors ...
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3answers
39 views

Range of duty cycle ms to drive RC servo motor and transfer function

I am using the ball and beam control system from Acrome robotics and I would like to identify the transfer function of the RC servo motor which translates motion to the system. First of all, I have ...
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45 views

Servo doesn't move properly

I have a problem with my servo motor. I connected a servo to the PWA connection of a PCA9685, but powered the motor externally. There's no problem with that and it works fine with some smaller servo ...
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103 views

I cannot move a servo manually

My servo is classic SG90. I connected +5V and gnd correctly to a dc power supply. Then I connected output of a signal generator which generates 0-5 V pulses at 50Hz (checked by oscilloscope). I know ...
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55 views

How can I make smaller steps with my servo?

I've got a Raspberry Pi with which I control a servo. The servo controlls the rudder in an autonomous boat I'm building. I'm using Golang and this gpio library to control the PWM. The input I get ...
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52 views

How do I supply 200-ish mA to servo connected with Adafruit's PCA9685?

For a project in school I have to build a robot playing a bass guitar. To play the notes I planned to plug 16 servos to Adafruit's PCA9685 but it doesn't supply enough Amps to the servos. How can I ...
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63 views

Help needed to select proper electric motor for constant drive

I need about 180 degree movement, back and forth in about one second. Maximum torque is about 2.2 kg ⋅ cm. I have tried RC-servos (up to 20 kg ⋅ cm), but they all burn within first 12h (maximum drive ...
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61 views

Check the position on analog servo [closed]

In analog servo, how to set the position with hands then check the position in raspberry pi,yes i know potentiometer can do that but i want with servo motor. Now, i can increase decrease the speed of ...
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134 views

what is difference between servos & servo motors?

I am studying about basic of motors and i came across two terms Is there any difference between two terms servos and servo motors? or they both exactly same??
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80 views

Does an ac servo motor experience high “inrush current” every time it moves after initial power up

we are currently building a motion platform for an airplane simulator and the linear motion actuators will be driven by 6 servo motors of type: Syntron 3KW AC 380V 130HMB-30100. The datasheet says ...
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36 views

Brushless DC Control

I'm controlling a brushless motor using a raspberry pi. I use servo pulsess to control my motor. But i also need to turn it in the reverse direction. To do that, I have no idea what to do. Some say ...
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1answer
54 views

Can servos have a true neutral gear?

I am developing a mechanical arm that can be pitched remotely at a certain angle using a high-torque servo motor. The servo needs to keep the arm at a precise position for any give amount of time and, ...
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78 views

Scaling level of PWM signals

I am going to scale PWM 24V generated by PLC to PWM +5V by means of optocoupler TLP521 and MOSFET BSP295 in order to control a micro servo motor (MG90S). What I have tried till now is the below ...
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1answer
74 views

servo control using a microcontroller and separate power supplies

I'm trying to get a very basic servo control circuit to work using an Arduino and can't figure out where I'm going wrong. I've got separate 5V power supplies for the microcontroller and the servo, ...
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57 views

Is it possible to 'upgrade' a 5V-RC-servo for higher voltages? [closed]

I built a robot using these servos. Since the robot is quite heavy, the motors need more current than my power supply is capable to deliver (around 3.5A peak). One solution would be to upgrade the ...
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78 views

Trying to Build a Servomotor Tester

I tried to build a very simple servomotor tester. I am using astable mode with a potentiometer and resistor on a NE555 to generate a 20 ms period. It has a correct frequency on the output between 50....
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138 views

ATMega328P control servo motor speed with potentiometer

I'm trying to develop an application in atmel studio 7.0 which will allow me to control the speed of my servo motor with my potentiometer. Now, the problem is that I don't really know how to do that? ...
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75 views

How is this servo amplifier made work in SPICE?

At page 13 of this Analog Devices document there is a circuit which consists of a servo amplifier and a bridge. The operation principle is explained in the document. Here is the the schematics given: ...
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35 views

How to avoid lag of servo motor used with distance sensor in FRDM-KL25Z

I am having trouble with using distance sensor and servo motor at the same time. My project is a radar project. I have a servo motor sweeping around and on top of it I have distance sensor. When I ...
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1answer
132 views

AC servo ASDA-B2 modbus position control

I have a very specific question on ASDA-B2 servo driver and I hope there is someone who has hands on experience with it who can help me out. I have referred to this user manual and it is not very ...
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2answers
123 views

Powering Arduino and servo motor

The main goal of this project is to control a servo motor with an Arduino. I have a 12V 5Ah power supply connected to the Arduino. The servo is connected to 5V and GND on the Arduino. When using ...
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49 views

How do I show a four wire servo motor in Proteus?

I have a four wire servo motor which I am interfacing with my micro-controller. I use the feedback wire to know the angle or position that my servo arm is at. The standard way of interfacing a three ...
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253 views

Powering a servo with 9V battery and other questions

I'm working on a small project. I want to make an internet-connected dog food dispenser to attach to my dog's crate so I can dispatch a network command remotely to dispense it. I have a Raspberry Pi ...
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69 views

How does the comparator set the motor speed at a fixed level?

How does the comparator below sets the motor speed at a fixed level? I can think that the comparator output will turn ON if the speed proportional generator output voltage is lower than the zener ...
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135 views

How this servomotor calibration is supposed to work at electrical level?

Here is the Wiring Diagram: I am trying to understand how this servo motor calibration process (see screenshot of BMW software) is supposed to work at electrical level. In particular: there is 2-pin ...
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630 views

Would the motor reverse if phases swapped for this case?

A servomotor power connection pins are given as follows: U V W are the three phase terminals. Would the motor reverse if I mistakenly swap phases U and V namely if I connect pin 1 to W and pin 3 to U?...
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23 views

Running MG996R servo using Eneloop Pros

Recently I just bought 2 pack of Eneloop pros, and have fully charged it. By using a multimeter I saw that the voltage went up to 1.3 ish after it is fully charged. And I'm planning on using 5 of them ...
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58 views

Servo arduino using eneloop

Say if i use 5x eneloop AA batteries to run 6x MG996R servo, will it be good enough since im afraid for the motor if it will burn out. I already read the spec sheet what im afraid is the stall current
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119 views

What can be the cause for the servo to jitter continuously while powered?

I'm using an HS-785HB servo (https://www.robotshop.com/media/files/pdf/hs-785hb.pdf) for my project. I'm working on the Mbed platform and it uses C++. The servo library I use is Servo.h and I'm ...
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77 views

Turnigy servo motor needs push to start

I currently have an inspection robot deployed in a remote part of Africa that has a failing Turnigy TGY-6114MD servo. The issue started happening during normal operation and was working fine ...
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66 views

Some questions about a servo motor driver input ratings

A servomotor drive input can be supplied either 3-phase or single phase. The photo of the driver nameplate is shown as follows: Does that mean in full/nominal load if this drive is supplied single-...
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58 views

Convert 2 wire pwm signal to servo control pwm

Bit of a weird one - got a controller that has a variable 12v PWM output (~100Hz), I can't change this output as the signal controls other devices, I haven't got an oscilloscope but I belive it's ...
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49 views

Uncertainty in current values of Power HD digital servo motor

In a project, we want to lift the load of 5 kg on the ground to half a meter. For this purpose, we use a 360-degree rotating PowerHD digital servo motor with a stall torque of 20 kg / cm. Motor ...
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131 views

What is a “digital” servo motor?

ServoDatabase lists various different servo motors, and describes some as "analog" (e.g. SG90) and some as "digital" (SG92R). "Digital" servo motors are apparently better (they seem to cost more, ...
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80 views

Connect servo and dc motor to raspberry pi

I'm currently working on a project where I have build a RC car with one DC motor (forward/backward) and one servo motor (steering). I'm a newbie with electronics so I figured out by myself I needed a ...
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72 views

How to choose proper power supply for 8 servos on Adafruit shield with Arduino Uno controller

I use Adruino Uno micro-controller powered with USB 5V from PC and Adafruit 16-Channel 12-bit PWM/Servo Shield on it with 1000uF capacitor, powered with 6V 2A power supply. Seems like it is not ...
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80 views

Automatic bird feeder with battery using servo

I am considering to create an simple automatic bird feeder with a servo motor and a plastic bottle, like this project, but without remote controller. The thing is that I would like to power it not ...
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161 views

Why do my servos break?

I'm messing around with some servos and one by one they stop working. I've got a Raspberry Pi to which I connected a pca9685 servo driver board which in turn connects to 3 of these cheap servos. I ...
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57 views

I want to use 4x MicroServo with 9V battery

I have 4 Tower Pro MicroServo 9g SG90 I want to power with a battery. This is the datasheet I found online. I have a small breadboard and some resistors laying around (220, 1k, 10k), and a 9V battery....
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94 views

Addition of limit switch for power supply stops circuit from working. Circuit works fine without the switch?

I am having an issue with a limit switch to turn on and off a circuit. I am using a L7805 5V regulator with a regular 9V battery as the power supply for my circuit. When I plug in the 9V battery ...
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145 views

Question about AC servo motor driver

Does anyone know what means when AC servo motor driver displays error code for "regenerative discharge", and stops working. What this mean in practical situation. This happens from 1 to 10 minuts ...
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205 views

Calculate torque from current induced in a single phase of a 3 phase AC Induction servo motor

I'm looking to measure the torque or slip angle on an AC induction (asynchronous) servo motor given the current induced in one of its phases. The servo and drive is yaskawa. Example data is shown ...

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