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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1answer
136 views

Linear actuator for impact tests [closed]

I'm puzzling over the remake of an impact testing machine. It's a sort of a robot arm that pushes a probe against a target to test its characteristics. Right now the machine use air pistons, because ...
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1answer
144 views

Determining rated speed (RPM) required for a DC gearmotor

I'd like a two-wheeled robot to travel at 1m/s, given a wheel radius of 0.03m. I've calculated the rated speed required by the gearmotor as 318.28RPM: $v = \omega r$, $\displaystyle{\frac{v}{r} = \...
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0answers
113 views

Design of an equatorial mount [closed]

I am considering designing an equatorial mount for astrophotography. I have been researching on the best way to do that and I am thinking on using a stepper motor with a gearbox. The thing is that it ...
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1answer
481 views

DC gearmotor stall current and battery capacity

I'm working on a self-balancing robot project and am in the process of motor sizing. I've read that with self-balancing robots the motors need to switch direction quickly, which can cause them to ...
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0answers
37 views

Help finding a linear actuator [closed]

I need help finding a linear actuator. I only need it to move 15 mm but it also needs to move extremely fast. Preferably 1 inch per second. It needs to be capable of holding a 10 lb weight. The ...
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0answers
27 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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1answer
478 views

What is the typical weight distribution for a brushless motor?

Brushless motors, like regular motors, have different parts (commutator, stater, etc). What do these various parts weigh?
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1answer
118 views

DC motor pid control [closed]

Would a 12V geared DC motor (about 140rpm) (with an encoder) PID controlled as a servo give a study response when subjected to a load?
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1answer
40 views

Motor Controller Power Supply

I have an Orange Pi which I would like to use as the computer for a robotic project. It supplies around 15 mAh power directly from the board, barely enough for a single LED so I will have to use ...
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1answer
2k views

Length and Width of a Line Following Robot

I'm building a line following robot. I have made different chassis designs. The main prototype I'm using is a rectangle base. At one side motors are placed. On the other side of the rectangle caster ...
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1answer
64 views

I need help figuring out what motor is used in this design

I am learning how to make rigs for high speed motion control. Basically, whatever action needs to be executed must be done by a rig that is triggered at an exact moment. In this particular case, I ...
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1answer
752 views

Starting and stopping a heavy rotating disc

I am currently working at a project involving a heavy disc rotating around its center. The disc weights around 2 kg and has a radius of 0,25 m. At every angle π/6, there exists smaller ...
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0answers
42 views

How to choose a motor for water surface vehicle? [closed]

I am about to build a water surface vehicle (a kind of boat). I was looking for different type motors and ruled out the stepper and servo motors. But I got confused between brushed and brushless dc ...
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2answers
645 views

Motor for DIY Electric skateboard

I've been planning to make an electric skateboard for a while now. All the tutorials that I have seen use brushless motors. However, where I live, its not possible to get the exact ones as shown in ...
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1answer
52 views

Will this have more or less lifting strength

Bit of an engineering question. If a snake robot is 100 cm long, and every 10 cm is another motor. Would the robot lift more weight, the longer/more motors attached to it.. or is lifting ability ...
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2answers
131 views

How can I turn a bowl/glass upside down?

I want to dispense water/cut-vegetables from a glass/bowl(240 ml) by turning it upside down. The screencast shows the idea: I can directly mount the clamp on a servo motor, but I think that will be a ...
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1answer
70 views

Can you detect if encoder wire is connected on a motor?

I am writing some logic for a PID controlled catapult (In order to improve precision). That is all fine and well. However, if, for some reason, the encoder wire disconnects, the motor spins ...
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2answers
2k views

DC motor - max current

I'm looking at the data sheet for a DC motor that states: Current consumption at nominal torque (mA): 380 I have a power supply that can deliver 500 mA. Can I ...
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2answers
319 views

How to decide the battery power for my robot

I need my motor to be powered with 12V, 5A for 1 hour continuously. How can i decide the Ah rate of the battery. Please suggest some lithium ion battery for the specification
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1answer
35 views

5kHz arm control, grasp end effector

I was having a chat with a robotic expert recently. The guy told me that for an arm with motor drives running at 5kHz your are to set the control so that someone can grasp the end effector and move it ...
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1answer
161 views

Communicating between a BeagleBone Black and a servo controller

I am a complete newbie and recently joined a robot team at my school in order to gain some experience. I have been assigned a task of driving a servo using a Pololu Mini Maestro USB Servo Controller. ...
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0answers
84 views

Single Board Computer/Microcontroller Recommendations for controlling large DC motors? [closed]

Hey looking for recommendations. Right now I am using a sabertooth 2x25 motor controller for my drive train, receiving signals from a raspberry pi. From what I am seeing online - there is a lot of ...
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1answer
301 views

Why to combine a Raspberry Pi (or similar board computer) and an Arduino for controlling motors?

I am planning to build a omnidirectional holonomic robot, and checking what I should use for the hardware, I saw many people using a Raspberry to compute most stuff, which in turn calls an Arduino to ...
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2answers
2k views

Steering using different speeds in DC motors or using a servo?

I am trying to assess the pros and cons of steering a robot car using different speeds of 2 or more DC motors versus using a servo and a steering mechanism? From your experience which is better in ...
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1answer
646 views

Which kind of motors and how powerfull should they be for a robotic arm

I am building a robotic arm with these specifications: 1 meter long approx. 1kg weight it is made of 4 motors. (2 at the base. One for rotating the whole arm left and right and another one for ...
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1answer
56 views

Granite devices Ionicube

Is it possible to enable/disable the 4 Ioni drives mounted in Ionicube individually? It appears with IoniCube that enable/disable applies to all Ioni drives simultaneously. However, Ionicube 1X does ...
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6answers
6k views

Robot never goes straight

I am using 2 identical DC motors and a castor wheel. The motors are connected to L293D motor driver and are controlled by RPi. The robot is not going straight. It veers off to the right. I am ...
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1answer
776 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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2answers
625 views

Robot clutch to disengage wheels

I have a robot that moves around autonomously. Very often I want to push the robot several feet to start a test over again, or sometimes I want to wheel the robot outside to my car or to a nearby ...
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3answers
6k views

How to reduce the DC motor starting current?

I am making a bot with 4 motors with a stall current rating of 11.7A. I was using 4 separate motor controllers which has a peak current rating of 20A to control each motor. But when I gave power to ...
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3answers
4k views

One motor, two wheels (motor direction rotates one wheel forward, reverse for other wheel)?

Rewriting this whole question as I've learned a lot more since I first tried to ask. I'm building a tiny bot and looking to use two motorized wheels for movement, but only one motor. I'll have a 3rd ...
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2answers
1k views

Line follower robot with 2 or 4 motors?

I am developing a line follower robot and I am not sure about how many motors should I use: two or four. I'm thinking of using four, but I do not know if it's worth it (it will let the car be heavier, ...
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1answer
1k views

How to calculate what wind speed is required to lift 1kg? [closed]

as the title says, i want to calculate how much km/h is required to lift 1kg of weight. Please explain this to me as simple as you can since i'm really noob in this. Thanks.
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1answer
41 views

Proper cable to connect 12 V, DC 6 Ah batteries to Sabertooth Motor Controller for Lawnbot?

I am building a (fork of) the Lawnbot-400 robot found on Instructables.com and in the book Arduino Robotics. The author, while brilliant, tends to gloss over and omit details, one of those being how ...
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1answer
378 views

Building a quadcopter, what motors, props and what are the calculations?

Before I start, I am a 13 year old, I would like to apologise because I am a beginner to all this and I wouldn't really understand any professional talk, I am only doing this for a hobby. I am ...
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1answer
111 views

What types of motor should I use for a particular application?

I want to create an amateur wire looping machine with Arduino, that has similar functionality than this machine. I don't need the automatic wire feeding as for my purposes this part can be done ...
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1answer
61 views

Plug & play motors, actuators and drivers system

I was wondering if anyone knew of any easy-to-use plug and play systems, that allow you to build and programme a number of actuators and motors quickly and easily? I'm thinking something like Lego ...
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2answers
164 views

Motor Controller Configuration

With a group of students we are building an exoskeleton for paraplegics. I am part of the Software & Control department and we are designing the motor controller configuration. We have several ...
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1answer
186 views

Implementation of the Control of a Quadrotor, as taught in Aerial Robotics in Coursera [closed]

I completed the course of Aerial Robotics in Coursera and I want to implement what I learned in a real quadrotor. The thing is that when I see the equations given like this: For the sake of the ...
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2answers
1k views

Driving sensorless three phase BLDC motor with Arduino and IMU

I have started to work on a little project of mines, which consists in implementing the stabilization a single axis gimbal using Arduino. The gimbal is driven by a sensorless three phase brushless DC ...
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2answers
275 views

Motor for a hydraulic pump in a hydraulic system

I'm not entirely sure if this is the right area to post this question, but looking at the other subjects on StackExchange, this seems to be the best fit. I am a complete beginner to hydraulic systems,...
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5answers
9k views

High voltage motor control with arduino

I'm trying to control a higher voltage motor than an arduino can source with a pin, with an arduino. I am trying to hook it up to a transistor. The battery pack is not supposed to be 4.8V, it's 6V, 4 ...
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1answer
42 views

Motor-controller with path output [closed]

I'm entirely new to robotics and have the following design requirement for a project I'm working on: Given a robot capable of positioning an object in three dimensional space ( vis. a plastic ...
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1answer
5k views

Calculating Required Torque

Say I had an object with 4 motors/wheels attached (in a fairly standard arrangement). I need to calculate the amount of torque required from the motors to be able to move the object of x kilograms ...
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1answer
437 views

How to dimension a 3 DOF robot arm with RRR configuration?

How can the maximum length and mass of the linkages of a RRR type robt arm be calculated, if the motor's mechanical characteristics are given?
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2answers
144 views

Tring to run 12 V DC geared motor using Samsung Li Ion ICR16850 batteries

I am trying to run this motor. Using the batteries stated in the title. The motor requires 12 V and I am supplying 11.98V to the motor, through a motor driver. After a while, the motor keeps slowing ...
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2answers
4k views

What is the torque/force required to rotate the base of a robot arm?

Take a look at the following simple example robot arm: I want to know the torque required on that bottom motor to rotate the arm. Since it's not exactly rotating directly against gravity like the ...
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2answers
497 views

What are some ways to estimate torque/load on a robotic arm joint

My main problem is measuring joint torque/load economically. There are ways to detect the electric current drawn which is proportional to the torque. Since my motor is a BLDC motor, there will be a ...
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0answers
71 views

Mechanism to oscillate a human leg?

I'm working on creating a robotic device capable of oscillating an adult human leg using the knee as pivot, being able to constrain the amplitude of oscillation by controlling the mechanism with a ...
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3answers
1k views

Power solution for Raspberry Pi robot

I am building a Pi car with 4 gear motors (190-250mAh each max). Now I want to use my 10000mAh USB power bank to power up raspberry pi along with the 4 gear motors. I can power up the raspberry pi ...

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