Questions tagged [motor]

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

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21 views

Make servo's shaft longer

I’ve got a few servo motors MG995, MG996R, etc. For my make I need a servo to have a longer shaft – 6cm or so. I cannot find a way to achieve it. There is lots of Shaft Coupler for steppers and DC ...
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41 views

Quadrotor dynamics: How is torque created

I'm a software engineer and I've recently engaged into Robotics field. I've started by a course on Coursera which talks about Aerial robotics and thus quad-rotors. I'm trying to understand how quad-...
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Why isn’t my shaft moving? [duplicate]

When I put my shaft through the vehicle body (small robot) and have the motor attached to it through two rotating gears, the shaft isn’t rotating? I think it’s due to how the hole diameter is the same ...
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Motor failure detection and compensation in quadcopter

I need to perform some analysis on motor failure detection and compensation in quadcopter. I have been using PX4+Gazebo for 3 months and recently found that it does not include motor failure detection ...
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How can I improve DC Motors rise time?

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55 views

Can I measure torque from this motor by only measuring the current?

I am new to robotics, please forgive/correct any errors. My Project Plan I want to use a PID controlled motor in a human-interface device where I need to measure the user's exerted force on an end ...
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Is it uncommon to use a gearbox with a brushless motor?

I've spent far too long this evening researching whether it's possible to clone a Starship; for my own amusement and/or to terrorise the neighbourhood. A Starship delivery robot, that is, not the ...
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Frame Rotation to Motor Displacement

I have the following problem: I have an x,y,z reference frame that is to be rotated around its x-axis and around its y-axis. Three axial motors Mp,Mq,Mr (120 deg apart) are responsible for these ...
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2answers
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No electric motors can handle being stalled for even short periods of time, even at low power. Is this statement true in all cases?

We were using a regular POLOLU d.c motor whose stall current is 0.36A. We want to use this motor in a robotic hand where the motor will be stalled while holding the object. We are limiting the current ...
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37 views

How to compensate for back drive caused by gravity

I have a 24v DC motor with a planetary gear box, Hbridge, and encoder feedback that drives an arduino robot similar to a winch that moves a weight by spooling a strap up and down. The problem I am ...
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1answer
38 views

Motor driver damage and jerking behavior when load driving in same direction as motor

I'm having trouble with a gear motor being powered by a power supply, while it is being driven by the load in the same direction as the driver wants to drive it. Here is a simple diagram: The gear ...
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Choosing the right dc motor

I'm trying to find the optimal components list for a radio controlled lawn mover i'm trying to build. The blades will be rotated by a 140 cc engine. I choose this engine because it's already mine. ...
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51 views

Where to buy cheap motors and mechanical parts for hobby robotics applications? [closed]

My kids want to get into robotics, where Online can I buy the motors (dc,ac,stepper...) and mechanical assembly (nuts, bolts, sheet metal, springs, rods...) for a very affordable price, you know I ...
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19 views

How to pick the right motor driver?

I have this brushed DC motor (Vex 775pro: https://motors.vex.com/vexpro-motors/775pro; motor curve data here I assume is useful but I do not exactly know how to make sense of it) My question is, how ...
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Is it OK to apply too many volts to Actobotics HD motors?

Is it ok to apply too many volts to Actobotics motors? Too many as in 14.8V. Each motor requires 12V. Would it damage the motors in any way? and if so, in what way?
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Determining required torque for DC motor

How to determine the required torque while choosing a DC motor? Here is a simple scenario. Think of a 4WD or 2WD vehicle. The max load the vehicle will have is 100kg. Q1. How do I determine the ...
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1answer
25 views

BLDC Stuttering when attached to Arduino Nano

I am working on building a quadcopter with an Arduino nano. I am currently only working with 2 motors. However, I am experiencing an odd issue. When I try to run my motors, one of them runs fine, ...
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Why aren't my 4x 612 RPM motors driving with only 12 lb load?

I have purchased x4 612 RPM actobotics motors. Every time I try to drive the motors on ground, the motors stall, as if the torque was too low to drive. The motor model: servocity.com model #: 638284 ...
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How to avoid hair entanglement in your robot wheels?

This isn't about any complex math or physics of robots, but rather an annoying practical issue I don't find much information about. My robot works indoors (house, office) and there's certainly going ...
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1answer
43 views

Counterweight in arm designs

I wonder why most robotic arms use large J2 (shoulder) motors rather than counterweights. What sort of complexity do they add to the design beside increase in overall weight? In fact, rather than ...
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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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1answer
24 views

Given this old pin diagram and numbers on this old encoder, what would be a suitable modern encoder to use?

My place of work has recently acquired a Hydraulic Press Break from the 80's. It has a CNC controlled back stop which is driven by a DC motor and Screw drive. The encoder which couples to the motor ...
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29 views

Measuring a Motor's Internal Temperature

As a final safety measure regarding some high wattage motors, I want to measure their temperature (either internal or surface) in live time so that I can automatically kill the power if it crosses a ...
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How to avoid false encoder counts due to vibration in robot?

I have a couple of motors on my mobile base other than the drive motors, and they tend to create vibration in the robot. When these motors are turned on, the wheel's encoder ticks increase without any ...
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1answer
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Raspberry Pi & L298N & Johnny Five, motor turns when instantiated

I'm a newcomer to this kind of tinkering so please bear with me here. I've searched high and low for an answer but have been unable to find one. I have a Raspberry Pi Zero W hooked up to a L298N motor ...
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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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1answer
336 views

What is the difference between the holding torque and stall torque of a motor?

Do the terms holding torque and stall torque imply the same thing? The information on torque for these stepper motors is given as holding torque. While these servo motors have the torque given as ...
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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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1answer
46 views

DC motors are stalling at low voltage (L298N controller)

I'm building a small tracked robot. Currently it's just a Raspberry Pi, two motors and an L298N controller. The problem I'm facing is that the motors are stalling at low voltages (which is what I ...
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1answer
19 views

AC Motors vs Hydraulic motors for skid-steering robot

I'm designing a mobile robot with tracks and skid-steering driving system and I am evaluating whether an electric motor would be better than a hydraulic one. I did some calculations, the total weight ...
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1answer
35 views

Using Integral gain for motor positioning

I'm struggling to see how Integral gain is used for motor positioning (with an encoder on the shaft). Suppose we have an AC motor connected to a winch which drives an object forwards and backwards. ...
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1answer
21 views

Understanding KGf.CM in Camera Robotic Head Design

I am attempting to design a robotic camera head - however, I am struggling to calculate the torque (in terms of KGf.CM) I will require to rotate the Y (tilt) axis of the head. The motor I intend to ...
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25 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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1answer
101 views

How do I convert centre-returning joystick values to dual hobby-motor direction?

Currently my setup is: 2x hobby TT motors connected to a Pi Zero with a motor HAT Python script running on the Pi which runs a Blynk python client and controls motors via the gpiozero library Blynk ...
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49 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,...
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1answer
34 views

Industry robot maximum torque

In google search, I find Abb industry robot wrist maximum torque is around 6000Nm, So I’m wondering, in most industry robot, how much the maximum torque can reach? In another words, which motor is ...
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1answer
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Bump and turn toys: how do they work?

I remember that when I was a kid, in the 1980s, I had some toys made in Taiwan that basically worked like this: they moved forward uniterruptily until they bumped into an obstacle; then they moved ...
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1answer
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Why applied joint torque will affect another joint?

I want to ask a very simple question. For the robot dynamics Newton-Euler algorithm, suppose there is a two-link planar robot, we can write the simple dynamic equation form as $M(\theta)\ddot{\theta} ...
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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 ...
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1answer
38 views

Driving a small motor

I am trying to drive a small motor using (software emulated PWM) from a Pi like device. I'm following a circuit that looks like this:L https://www.instructables.com/id/Raspberry-Pi-GPIO-Circuits-...
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197 views

Why to seal a motor shaft, or the whole motor, for underwater ROV?

I just finished a competition for underwater robots. The water is about 40-50cm in depth and 90% of the designs just exposed the thrust motors completely in the water similar to the picture below and ...
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29 views

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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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 ...
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40 views

Are rotary encoders necessary for ball shooting mechanism?

I'm designing a bot for a TDP(Team Documentation Profile) for a competition which is supposed to throw a rugby ball. Since the deadline is closing in soon, I can't test things out myself. After ...
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72 views

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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1answer
48 views

BLDC Outrunner Direction Change?

I'm designing a Quadcopter for my project. I've seen a lot of guides that the motor rotational direction should be opposite to each other. My doubt is whether the motor have a variety of CW rotation ...
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2answers
120 views

Stepper can't turn plastic wheel. Is it normal?

Is it normal, that a stepper motor with the following specifications can't reliably turn a plastic wheel with a diameter of 13cm and a simple direct coupling? Type: bipolar, two phases Voltage: 2.55V ...
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80 views

Can I apply a common voltage to a high speed running DC motor to stop it? Will it damage the DC motor?

I decelerate the velocity of my robot very quickly by applying a common voltage (eg. 24V to both the terminals using Motor driver) to the DC motors. Given, the motor is running at a very high speed ...
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102 views

Torque calculation for a shaft end effector

I would like to calculate the max torque and the rpm to select the right motor. the application does not require a very fast rotation speed (rpm) however it should be accurately controlled. I ...
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1answer
40 views

Drive axis with slipping gear

I'm looking for a name of the mechanic part (axis-gear combination) with the following description to use it in an automatic window control. I can't find this online to get parts due to the lack of ...

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