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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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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3answers
5k views

Harmonic drives in hobby projects

After a fair bit of research into industrial robot arms I've learned that a lot of them use components like harmonic drives and sometimes cycloidal gearboxes. Two main questions: How feasible are ...
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1answer
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Need super-basic help with motor encoder

So I have this motor: https://www.servocity.com/23-rpm-hd-premium-planetary-gear-motor-w-encoder and this motor shield for my arduino uno: https://www.pololu.com/docs/pdf/0J49/...
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2answers
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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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1answer
75 views

How to get started on making a dispenser for Indian spices?

I want to make a dispenser system for Indian spices. Dispense in multiple of teaspoons (5 ml) Handle powdered spices and small seeds like mustard/cumin I ordered a spice carousel from amazon and ...
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3answers
896 views

What types of actuators do these industrial bots use?

I have a particular example robot that interests me: http://www.scmp.com/tech/innovation/article/1829834/foxconns-foxbot-army-close-hitting-chinese-market-track-meet-30-cent See first image, the ...
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2answers
4k views

Quadrature encoder signal from dc motor is very noisy

I'm starting out with robotics, got my first DC gear motor with quadrature encoder (https://www.pololu.com/product/2824): I ultimately plan to hook it up to a motor driver connected to a Tiva ...
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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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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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1answer
625 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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2answers
60 views

Running a cycle on brushless outrunner motors? [closed]

Is it possible to convert a cycle into an electric bike by using brushless outrunner motors that usually are for RC planes, multicopter, helicopter, etc? If it is possible, what specs do my motors ...
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1answer
485 views

What are good, low cost, actuators for a braille tablet to be controlled by arduino?

I want to basically make a pin matrix controlled either by spring, electromagnets or small motors(spring being the most viable option), something like what’s shown in the image. I'm pretty new to ...
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1answer
473 views

Need help regarding odometry using Encoder motor and raspberry pi

I am doing project on odometry using raspberry pi. I know that encoder motor will tell me how much distance my robot has covered, but I have no idea ho to implement completely. I just need guideline ...
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3answers
4k views

Is horsepower related to torque in electric motors? [closed]

Is torque related to size or power at all in electric motors? And what about gas motors too? I have a go kart that is 2.5hp and it's 50cc and its about 1ft x 2ft x 1ft in size. I also see online ...
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Question about what motor to use for opening window

first off, just to be transparent, I'm a total newbie when it comes to DC motors (and pretty much anything robotic). I've got a couch that's right up to a window with the lever type openings (...
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2answers
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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
234 views

What does internal sparking in a motor mean?

My Arduino + Raspberry Pi robot was working fine in the morning. I tested it, it ran perfectly, and then I switched it off. Now in the evening when I'm trying to run it again, with the same ...
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1answer
1k views

How to select dc motors for a line following robot?

What are the criteria to consider when ordering dc motors for a line following robot? Is there a way to calculate the torque required?
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1answer
103 views

iRobot Create2: Granularity of drive control?

I own an iRobot create2 on which I am planning to implement a control algorithm. After playing with the different drive commands, I noticed that changing the desired velocity values marginally doesn't ...
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1answer
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How to make a robot? [closed]

For instance, how would you hook up a electric pump communicate with a motherboard? Let's say I buy a electric pump, I hook it up to some sort of metal structure that if the pump is turned on it moves ...
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4answers
117 views

Motor Choice given size constraint and load requirement

Good day everyone :) I am an undergraduate student working on a project involving the use of high torque small-sized DC motors for use in designing a person following trolley bag. Where in the ...
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1answer
59 views

Double/Triple inverted pendulum always on a cart?

All of the examples of keeping a double/triple inverted pendulum balanced using a PID controller I've seen seem to be on a cart. Like this one https://www.youtube.com/watch?v=cyN-CRNrb3E How come the ...
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2answers
102 views

Why wouldn't my robot stop?

I am working on an Arduino based robot which engages a braking mechanism detecting anything in front. I was using an ultrasonic sensor, to detect obstacles which worked well while the robot was on my ...
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3answers
929 views

Can too much input current destroy my motor driver?

I have a 18 V rated driver I'm using to drive two 12 V DC gear motors using my Arduino. I bought a new battery pack which is rated 3300 mAh 25C, 11.1V making the total current input 82.5 A. My driver ...
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1answer
84 views

Suggestion for correct battery pack

I am trying to run 2 12V Geared DC motors which has No-load current = 800 mA(Max), Load current = upto 9.5 A(Max). Runtime to be atleast 3-4 hours. The motor takes about 10-12 V for operation. I need ...
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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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6answers
14k views

How to check for a sharp angle with a line follower?

I have the mBot robot and I want to program it to follow the line. So far it can pass any kind of line that is >90°. I want it to be able to pass 90°-ish angles as well. Like this one: The problem ...
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2answers
7k views

What is a CIM motor?

I'm trying to make decisions for motors on a robot build. I keep running across CIM Motors. What is a CIM Motor? Where does the designation CIM come from? What does CIM mean?
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DC Motor Control

My project requires a DC motor for mobility, very similar to an RC car. If precision isn't critical, can I use a solid state relay instead of a motor driver? If the vehicle moves an extra inch on the ...
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2answers
312 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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2answers
1k views

Relationship between motor torque and acceleration

I am working on designing and building a small (1 1/2 lbs), 2-wheeled, differential drive Arduino-controlled autonomous robot. I have most of the electronics figured out, but I am having trouble ...
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2answers
749 views

3 way check valve

I am working on a micro dispensing system, using syringe pump. The design involves a syringe on top to be moved by stepper motor. There would be one liquid reservoir form which the syringe would pull ...
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0answers
39 views

Freewheel diode / capacitor with this board? [closed]

With DC motors, it is common to put a freewheel diode and/or a capacitor in order to protect the equipment as the motor can induce current into the system. I plan to use this board to control a 24V ...
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3answers
8k views

Simple equation to calculate needed motor torque

Suppose I have a DC motor with an arm connected to it (arm length = 10cm, arm weight = 0), motor speed 10rpm. If I connect a 1Kg weight to the very end of that arm, how much torque is needed for the ...
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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
375 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
170 views

Do these motors really have enough torque to lift 130 pounds

I was looking at these dc motors and I converted the torque to force at a meter distance and I got that two of them should be able to lift over 130 pounds, is this right? http://www.active-robots.com/...
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0answers
617 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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2answers
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Can i use DC Brushed motors for building a drone? [closed]

I want to make a drone. But my budget is very low. Brushless motors are very expensive. I want use the Brushed CHEAP ones. can i us them ?
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1answer
376 views

DC Motor to open a door

I want to open a door using a DC motor. I've estimated that the required power in the worst case would be around 35-40W (considering a ~80% efficiency). The whole is controlled by a Particle Photon. ...
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1answer
84 views

POM gears and metal fittings

I'm looking at this setup: where the POM bevel gears are fitted with some kind of metal (bronze?) tube inside which fits over the shaft. What benefits does this method provide? Is it to allow the ...
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2answers
132 views

Suitable gear construction for a robotic extender - plastic?

I have a rather simple setup for my robotic extender. The DC motor turns a shaft with a worm on it. The worm connects to a small worm gear (green) which itself has a small gear (red) on the same shaft ...
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5answers
880 views

Moving a small plate back and forth

I'm hoping to move a plate (3MM x 45MM) back and forth using a DC motor. Here's my idea so far: The motor drives a threaded shaft which is attached on one side of the plate. To help alignment, a rod ...
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1answer
649 views

Could a motor shaft be swapped for a threaded shaft?

I'm looking at the N20 DC motor which is fairly popular. Does anyone know if the shaft could be swapped out for a threaded shaft?
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2answers
2k views

DC motor shaft and gear installation

I'm hoping to use a DC motor to drive a cog bar horizontally along a track. AFAIK, I'd need to install a (plastic) cog on the motor shaft, which itself grips on the (plastic) cog bar. Does anyone know ...
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1answer
507 views

Change PWM values according to encoder output

I have a motor with an encoder. When I set the speed of the motor it should change its speed so that encoder readings per second should fit an equation $y = ax^2 + bx + c$ where ...
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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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3answers
561 views

How can I increase the resolution of a PWM signal?

Say I have a motor and I want it to spin at exactly 2042.8878 revolutions per minute. Say I have a very precise sensor to detect the RPM of the motor to a resolution of 1/1000th of a revolution per ...
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2answers
1k views

Which USB interface for Android device I can use for motor driver

I am new to robotics, I will be controlling DC motors from Android device through USB For this I have selected L298N motor controller(After watching YouTube videos ) And got some DC motors I have no ...

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