# Questions tagged [motor]

Without qualification 'motor' is usually taken to mean a rotary electromechanical motor, typically either a brushed or brushless design.

43 questions with no upvoted or accepted answers
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### Robot - Wall Avoiding (Plinko Robot)

I am looking to build a robot that will travel and zig-zag down the hallway.It will be headed towards a wall at roughly 45 degrees and then use a IR LED to detect when a wall is nearby. From there, ...
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### How to calculate what motor I need to move weight

I'm working on a project trying to make some electric roller curtains. I can use 2 motors on this curtain, on each side to lift and pull down the curtain. Pulling down the curtain requires not as much ...
1 vote
75 views

### How to calculate the required torque of motor for bipedal robot

I just create a bipedal robot in SolidWorks and after I got all components, I realise that I need select the correct motor for the robot. There will be four motors equipped in the robot, two for hip ...
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1 vote
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### From speed vector to motor control

I'm working with Mona robot (image bellow). The movement is controlled by settings the speed of each wheel. I'm trying to find a way to convert a speed vector into motor control so that the robot will ...
1 vote
303 views

### Efficient control for BLDC 3-phase motor with BEMF using Arduino (Atmega328pb)

Working on developing efficient code for driving a BLDC 3-phase motor with BEMF feedback using Atmega328pb, The code is based (as a starting point) on this tutorial: Link The basic understanding is to ...
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1 vote
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### Smart Servo Motor Type Comparison

I have been using the standard MG90/SG90 servo motors for years now and am familiar with them. Recently, I am trying to build a robot dog with them with no success. The motors keep on vibrating and ...
1 vote
70 views

### Gimbal motor shaft

Does anyone know if a shaft can be pressed into a gimbal motor like this? Is the centre metal ring just the inner race of a ball bearing? The ring looks thicker on one side but thinner on another ...
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1 vote
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### Robot dynamic control

This can be a basic question but according to my knowledge I don’t know answer. We can use control system theories to control the position of motor. Considering two motor joint leg it can model and ...
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1 vote
55 views

### Are rotary encoders necessary for holonomic mecanum drive?

I'm making a robot which is going to have a holonomic mecanum drive. The doubt that I'm having is that should I use rotary encoders for doing so. The bot will be manually controlled so would it be ...
1 vote
69 views

### How to use thrust bearing with shaft?

I know how to use radial bearings, e.g. ball bearings with shaft. But no matter how much I googled I didn't find any proper clear way to use thrust/axial bearing with shaft. I downloaded the thrust ...
1 vote
224 views

### Kinect V2 (Arm/Hand Reading) to G-Code

I am very new to this space and would greatly appreciate some clear guidance. I have a Raspberry Pi 3, Arduino Mega 2560+Shield, and Kinect v2 + PC USB cable adapter. I am currently building the ...
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1 vote
28 views

### Issues with the dual VNH2SP30 motor carrier and 131:1 metal gearmotor 37Dx73L mm w/ 64 cpr encoders

For a while now I have been trying to build my own robotic platform, kind of like a turtlebot. However, I have kept running into an issue with controlling the motors. My main controller for sensor ...
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1 vote
695 views

### mbed dc motor speed control using optocoupler encoder

i have been playing with mbed since few week ago and would like to create a test program for dcmotor speed control. im using a 24V dc motor with encoder attach.. then test, at first i test with ...
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1 vote
44 views

### Actuation of three reciprocating blades via conversion of rotary to linear

Sorry if this is out of robotics, but this seemed the closest. A motor has to be used to rotate three cranks. They are in the same plane, but each should not run at the same time. Only one that ...
• 11
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### ros2_canopen implementation motor

I implemented the ros2_canopen Package for my Motor. So, the device started and i configured all the stuff with the yaml file. My yaml file can you see below: ...
• 1
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### ROS2 CANopen Stack

I'm trying to implement the ros2_canopen package for my Motor. So, i installed the package and set up all the configuration stuff. If i started the launch-file, I get following error message: ...
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### Incorrect values of encoder for mbot Ranger

I have an mbot ranger which uses the 180 Optical Encoder Motor (https://support.makeblock.com/hc/en-us/articles/12376087604887-About-180-Optical-Encoder-Motor-for-mBot-Ranger-). My final goal is to ...
24 views

### Simulating more powerful motors in Gazebo?

Is there a way to get Gazebo to recognize the power of a motor? I have a couple of powerful motors in my differential drive robot that given the weight of the robot I should be doing 16 feet/second ...
21 views

### High speed, high precision motors for a Spherical Parallel Manipulator

As the title says, I am looking for motors suitable for my Spherical Parallel Manipulator. The Spherical Parallel Manipulator will have a camera (likely a DLSR) mounted to it. The motors need to be ...
• 1
45 views

### ROS2 Controller to send torques

I have been working on a self balancing robot and would really appreciate some help, I would like to know how to send torques to motors with ros2 control, I'm using dynamixel x motors.
• 1
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### Rotot hardware - batteries considerations

[please dont downvote, just let me know what infos are missing] I built my second robot and I always end up with the same issue ... The CPU board always resets when a high rush of current is demanded ...
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### Gazebo SDF file, Defining Motor & Prop parameters like MaxRotVel, RotorDragCoefficient etc

I am new to Gazebo SDF file generation and I am facing problems in defining motor parameters. Can anyone give an understanding (also where to get it). Iris is an example which is already there as a ...
8 views

### Accuracy of PTZ with Permanent Magnet Synchronous Motor (PMSM)

For my project I need a pan-tilt system able to provide 0.1° resolution or better. I do have my own solution based on stepper motors with planetary gear for low backlash and 0.05°. However, I designed ...
22 views

### How can I rotate a stepper motor northwards?

I am working on a project where I need to rotate a stepper motor North, South, East and West. To implement this, it seems like you just need to know where one direction is, say North. Given that, you ...
• 1
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 ...
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27 views

### How to find coefficient of friction that will maximize torque?

When using DC motors with a drive wheel (aka "direct drive") to propel a vehicle (e.g. an RC car), force and torque play a role in how efficiently that motor's power is transferred into ...
• 111
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### What DC motor is fit to replace this AC one?

I've a machine with this motor: I would like to swap this one with a DC motor in order to have better control, maybe a stepper one so that it could be controlled via an arduino board and a dedicated ...
• 101
119 views

### H bridge duty cycle vs maximum voltage

I've just burnt out an L298n H bridge, not surprising, but I thought it'd be ok for low load testing. Apparently not. I'm considering ordering these to replace them - Hilitand DC 5-12V Motor ...
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### Sample code for L298N H bridge Arduino Motor Driver not working

I am quite new to robotics, arduinos, motors and that sort of thing so there is a very strong chance I am missing something very obvious. However, I have looked up multiple tutorials online, none ...
35 views

### Precision/Repeatability issue with XArm6

I have a robotic setup with a XArm6 robot and camera facing up with vision algorithms. I noticed that after a collision or power glitch the robot gets offset. X, Y and Z and angle change according to ...
• 1
341 views

### Outer Position Loop to Control Inner Velocity Loop

I'm trying to control the position of a brushless DC gearmotor. To drive the motor, I have a controller box that provides a velocity that is proportional to a 0 to 5 V input. The motor has it's own ...
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### How to measure an optical encoder resolution and gear ratio?

I've bought a DC geared motor with an optical encoder. The vendor didn't provide specification. I can read MITSUMI M25N-2R-14 2241 and 25GA-370-12V-330RPM on the motor. There are some pages on the ...
• 101
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### How to drive a motor by Python

I need to drive any small motor (with small delay) by Python without low level programming. What hardware and software I need? Does "Robot Mesh Studio" fit for this? I want to make a robotic ...
• 101
86 views

### Find viscous friction for DC motor transfer function

How do I find the viscous friction for my DC motor without measuring the input current and output torque. I have to do a theoretical model on simulink and can't find any answers on how to find it
43 views

### How to create a jumping mechanism for a small robotic car?

I have to create a jumping mechanism for a small robotic car and was thinking about using a spring mechanism to do so. However, due to dimensions (16cmx8cm) and mass constraints (below 200g) I cannot ...
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### 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,...
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### Motor driver PWM frequency

What can happen to the motor driver if I give input PWM frequency more than the rated(capacity)? I'm using Maxon motor with specifications: Operating on 24V Speed: 600 RPM Nominal Torque: 21 Kg-cm
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### Removing the motor from a 2.5" HDD for controls project

I have a project that requires an extremely high rotation rate motor, and I have a 2.5" HDD that I'd like to take the motor out of. I chose a 2.5" HDD for lightweighting reasons and for the drive ...
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29 views

### Which motor is suitable for generating a constant pressure on objects?

I want to build a simple arm that can generate a pressure on a small object (a force of 50-100 gram is enough) and let go of it very quickly. Which motor can be used for this?
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### Servo malfunction

Summary I am making an automatic door for my chickens including a servo motor. In the process I actually shorted my 5V from my Arduino. The servo is powered by external batteries and only gets its ...
• 1
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### Tetrix Prizm and ROBOTC

I am currently trying to find if its possible to program a Tetrix Prizm motor controller with ROBOTC? Because I have an EV3 brain connected with the Prizm to a robot assembly with two motors, and I ...