Questions tagged [motor]

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

Filter by
Sorted by
Tagged with
0
votes
1answer
25 views

The Optimal Reduction Ratio

Hello everybody. For my robot design, I would like to utilize the most optimal gear ratio that I can use. For that I want to utilize the torque of my motor which is a linear function of rpm. This task ...
0
votes
0answers
28 views

Calculating motor Torque and rpm Requirements for Swerve Drive

Swerve drive is an independent steering type of drive system for mobile robots. To illustrate this better, A mobile robot uses 4 motors to drive 4 wheels, so 1 motor/wheel. However, a swerve drive ...
1
vote
0answers
14 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 ...
0
votes
1answer
52 views

4-Wheeled Mobile Robot, Motor-Torque, RPM Calculation

I want the torque, rpm of every motor to be used considering certain factors, in a 4 wheeled robot as you see in the picture below. Here are the factors affecting motor specifications that I Had ...
1
vote
1answer
22 views

How to calculate holding and operating torque at the base?

Could anyone please help me with the formula to calculate the operating torque and holding torque at the base to rotate the structure on top of it as shown in image with white arrows? Thank you in ...
0
votes
0answers
50 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 ...
0
votes
0answers
16 views

Quasi Direct Drive Actuator - Slot & Pole Combinations for High Torque Motor

I am building my own Quasi Direct Drive actuator and looking for information/ design guidelines for building a High Torque Motor similar to the MIT Mini Cheetah below. Specifically I cannot seem to ...
0
votes
0answers
35 views

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 ...
0
votes
0answers
22 views

Required motor torque for a small boat

What: We are building a small boat made of a special paper foam soaked in glue and epoxy. It is aproximinatley 40 cm long and 15 cm wide. Very light. We aim to transport a single can of beer at the ...
0
votes
0answers
47 views

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 ...
2
votes
0answers
11 views

DC motor modelling with Bond Graph

I am trying to construct an equation that describes the output torque as a function of lambda and omega I have obtained the following bond graph but I am unsure of how to proceed.
0
votes
1answer
51 views

Connect LiPo battery to Arduino Motor Driver Shield for RC Boat

Thanks for taking the time reading this question! It is greatly appreciated. What are we doing We (two complete noobs) are building a remote controlled boat from scratch using Arduino compatible ...
3
votes
1answer
36 views

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 ...
1
vote
2answers
109 views

Equations of motion in matrix form and energy consumption

I am working on Lagrangian derived high-dimensional motion equations for a robot in matrix form. The structure of such an equation is known: $M(q)\ddot{q}+C(q,\dot{q})\dot{q}+G(q)=0$ In here, $M(q)$, $...
0
votes
1answer
47 views

I need to make something that can slam something into something else really fast in both directions

I'm fairly new to robotics, but I have this idea for a machine. I've done a bit of research but can't find exactly what I'm looking for. I need something that can either move back and forth at at ...
1
vote
2answers
115 views

Why use timing belt drives in Stepper Driven Robotic Arm

This may be a noob question. I am sorry if it is but I am new to this field. I am working on a design of SCARA Robot and I am using Stepper Motors to drive it. In many youtube videos, I have seen that ...
0
votes
0answers
14 views

Motor Drive Sizing Drive continuous current / motor continuous stall current Ratio

I have a question about the ratio of the drive continuous current / motor continuous stall current. I read that a good ratio between these values is around 2, but cannot find an explanation why. I ...
0
votes
0answers
21 views

I’m not sure how to calculate the torque of a tank chassis what values do I need?

So I plan to build a robot-tank thing. It’s max weight will be 35kg and it’s driving wheel will have a radius of 0.05m. Those are the two values I know for certain and there will be no gears between ...
0
votes
0answers
47 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
2
votes
2answers
53 views

gear motor with encoder and Arduino Uno

I'm working on a project where using a gear motor with an encoder and an Arduino Uno. I have not done Arduino in a long time and am struggling getting it to do what I want. If you look at the wiring ...
1
vote
1answer
48 views

Why Hydraulics and Not Motors?

I have noticed everywhere that professional robotics companies use hydraulics over electric motors. I want to know why that is. Why can they make custom electric motors that are really powerful. ...
3
votes
1answer
190 views

Torque required to rotate arm with mass at end

I have to calculate the required torque to rotate a point mass of 15N on the end of an 1.2m long arm which I have calculated to be 10kg in mass. The rotation must have a constant angular velocity of ...
1
vote
1answer
45 views

What network protocol/control units are motor-based robots controlled with?

I know most vehicles are controlled via CAN (Controlled Area Network) protocol through an ECU (Electronic Control Unit) which send/receives data using this protocol and then sends/receives Amps/Volts ...
0
votes
1answer
58 views

What type of electric motor and speed-controlled circuit do I use to bounce a hanging, 5 pound weight? (it's for a Halloween decoration)

I'm trying to make a roughly 5 pound, hanging halloween decoration bounce on a string from about 1-3 times per second, preferably at variable speeds if I can. I've looked up a simple DC motor circuit ...
1
vote
0answers
53 views

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
1answer
32 views

Voltage not registering when motor is connected?

I'm trying to fix my kid's power wheel. When you press the gas pedal, nothing happens. I took it apart and checked everything. I noticed that when I disconnect the wires from the motor and check them ...
0
votes
2answers
115 views

PID controller for motor speed control and distance control

I am building a robot rover comprised of dual DC motors each with hall sensors to obtain rotaional speed. I currently have a PID controller for each DC motor that is able to control the speed of the ...
0
votes
2answers
102 views

Make servo's shaft longer [closed]

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 ...
0
votes
2answers
95 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-...
0
votes
0answers
24 views

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 ...
0
votes
1answer
109 views

How can I improve DC Motors rise time?

...
2
votes
1answer
68 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 ...
1
vote
1answer
111 views

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 ...
0
votes
0answers
16 views

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 ...
2
votes
2answers
171 views

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 ...
1
vote
1answer
38 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 ...
2
votes
1answer
60 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 ...
0
votes
1answer
28 views

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. ...
1
vote
1answer
60 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 ...
1
vote
1answer
37 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 ...
0
votes
1answer
23 views

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?
1
vote
0answers
45 views

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 ...
1
vote
1answer
33 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, ...
1
vote
2answers
82 views

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 ...
3
votes
1answer
97 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 ...
1
vote
0answers
28 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 ...
0
votes
1answer
34 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 ...
0
votes
2answers
31 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 ...
0
votes
3answers
147 views

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 ...
1
vote
1answer
131 views

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 ...

1
2 3 4 5
9