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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3answers
576 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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1answer
299 views

How to connect absolute encoder on the rotating shaft. Please see the three options?

Hi, Here I have added 2 options for connecting encoder on shaft. Motor, gearhead and shaft is connected using coupling. But where will be best place for encoder (To avoid backlash from coupling and ...
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2answers
2k views

How can I reduce a motor's maximum current draw?

I have a motor with a stall current of up to 36A. I also have a motor controller which has a peak current rating of 30A. Is there any way I could reduce the stall current or otherwise protect the ...
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1answer
147 views

Automatic sliding window shutter

I want to build an automatic sliding window shutter and need help with part selection and dimensioning. Some assumptions: window width 1.4 m sliding shutter weight 25 kg max speed 0.07 m/s max ...
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4answers
311 views

I can't get motors to turn with Raspberry pi

I want to turn some motors using my raspberry pi. I am able to turn an LED on and off using the 3.3V GPIO pin. For the motors, I tried using a L293D chip as per the instructions on this link. What ...
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2answers
854 views

Very low output voltage at the output of L298n?

I am using arduino and L298n motor driving IC to drive 4 12V dc motors (150rpm). Also I am using 11.1V LiPo battery (3cell, 3300 mAh, 20C).I have connected two PWM pins of L298n to digital HIGH from ...
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1answer
33 views

Sourcing motors by physical dimensions

I have a 1inch square tube that I would like to place a motor into. The motor I have takes up approximately 1/2 of the available space (roughly 3/4 inch I.D.) I would like to find the largest motor ...
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2answers
2k views

DC Motors for a ROV?

I am planning to build a homemade ROV, and I wanted to know a couple of things about the motors. First is: Will it be Ok, if I use a brushed DC motor, instead of a brushless motor, and is there any ...
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2answers
259 views

How would I replicate a tank/zero-turn steering system in a small robotic vehicle?

I'm working on a project that requires me to build a small vehicle (footprint of ~ 14 x 14 inches, less than 6.5 pounds) that can traverse sand. For the steering system, I was thinking of replicating ...
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2answers
12k views

How to calculate the current consumed by a brushless motor on a quadcopter

I want to create a virtual quadcopter model, but I am struggling to come up with a satisfying model for the brushless motors & props. Let's take an example, based on the great eCalc tool: Let's ...
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1answer
87 views

What factors should i consider when selecting a motor for a free wheeled cart-pole balancing robot?

I'm developing a small scale cart-pole balancing robot consisting of two wheels driven by a single motor at the base (essentially like a unicycle, but with two wheels to constrain balance to a one ...
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1answer
242 views

Motor for DIY Remote controlled shades

I'm currently undertaking a project to build remote controlled shades from scratch. I currently have every piece figured out except I don't know know much about the motors involved in something like ...
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4answers
2k views

How to rotate a dc motor at a fixed rpm

I am using 8051 microcontroller and a dc motor.What to do if i have to rotate the motor at any fixed rpm. Let's say 120rpm. And if it is possible by generating pwm,how to do the calculations for the ...
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2answers
76 views

How do I dispense a greasy fluid?

I'm a agricultural engineering student and complete newbie trying to build a simple mechanism attached to a drone that dispenses a grease-type fluid. However, since I'm not familiar with the field, I'...
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1answer
19k views

How is a brushless gimbal motor different from a regular brushless motor?

How are the brushless motors in a gimbal assembly designed? Obviously it doesn't need continual rotation, but it does need accurate control of precise position. I've noticed that the motors in my ...
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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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4answers
8k views

Electric Motor Speed Control - PWM vs analog voltage?

I'm working on a 2-wheeled robot and have connected up a raspberry pi to an L298N motor driver. I'm sending the enable pin of a particular motor a software-generated PWM signal at 100Hz with a 50% ...
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1answer
154 views

Duty cycle mapping

I need to build a conversion/mapping algorithm from a controller (PID etc.) output to the duty cycle in order to command my bldc motor via esc. I couldn't do it yet because l think l dont know the ...
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1answer
76 views

Building parts, and keeping laser alignment steady

I am building a laser gun for pentathlon targets (also doing one). I would like to know how build a part of the gun and if I can count on a steady laser if it is attached to a motor. The question is ...
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1answer
1k views

Highspeed with gearbox or low speed for brushless motor?

I'm attempting to control a small vehicle at relatively slow (.5 m/s - 1 m/s) speeds, but with extreme accuracy (1mm). For the drive system, I'm considering using brushless motors as they have a much ...
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1answer
1k views

Torque of coreless DC micro motor

I would like to build a small two-wheeled robot similar to the one shown here. In order to keep the robot small, I intend to use two coreless micro motors like the one shown bellow. The power source ...
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1answer
7k views

How do I accurately calculate the speed of a rotary encoder at a high sample rate?

I'm aiming to control a motorized joint at a specific speed. To do this, I'm planning on attaching a rotary encoder to do this. I'll be controlling the motor with a PID controller. With this PID ...
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1answer
619 views

Electric piston (longitudinal electric motor)?

Are there electric motors, which apply force not in rotational motion, but in longitudinal motion? They should have electromagnetic design and no gears and worms. Such motors would be great for ...
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2answers
354 views

2Nm small motor

Currently designing a spherical wrist, I want to manipulate a 300gr payload. the design has a 200mm span, so I'm guessing at a 1.1Nm (considering the weight of structure & motors). I've looked at ...
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1answer
534 views

How to control a dc motor

I have 2 of these 12v motors and a 12v battery http://www.enigmaindustries.com/Motors/Bosch_EV_Warrior.htm I would like to know what the best solution for controlling this motor with an Arduino Uno ...
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1answer
67 views

What is load current and load speed? Which battery is best suitable for this motor? [closed]

These are the specifications of the motor: 25000RPM no load speed at 12V No Load Current - 1A, Stall Current - 10A 0.36Kgcm torque What is the definition of load current and load speed? ...
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2answers
321 views

Robotic winch force sensor

I have a requirement for a motor that pulls a piece of rope until the rope is taught. However I'm at a loss as to how to achieve this, I'm sure it must've been done before but I'm not sure how to best ...
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2answers
3k views

An easy way to exert desired load on a motor shaft?

I am trying to exert a desired load of 0.07 N.m on a BLDC motor shaft whose length is 0.750in and diameter is 0.3125in (0.008m). I can go to a machine shop and get a small adjustable cylindrical ...
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2answers
759 views

Building industrial-like robotic arm

I would like to build a 70cm articulated robotic arm (not a scara one) that can lift between 10kg and 15kg (10kg would be awesome already, this payload includes the weight of the arm+gripper) and ...
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3answers
82 views

How can I communicate wirelessly between a RasPi and servo?

I want to use a Raspberry Pi to pan a camera mounted on a servo wirelessly from ~100 feet away. What are some good servos and transceivers for this? To clarify, there should be no physical connection ...
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2answers
254 views

Low power to motors — motor power jumper issue

I'm currently working on my first robotics project using the Initio kit from 4tronix powered by Raspberry Pi. The setup was fairly simple, and I've been testing it out over the last couple of days. ...
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1answer
518 views

Verifying motor selection calculations

I'm trying to select a brushed DC motor for a project. I tried following the advice on sizing electric motors, mentioned in this question, but a few details were missing, and I'm unsure if I properly ...
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2answers
150 views

Recommendation for good source of Robotic Components [closed]

Im looking for a good source for robotic components like sheel/tracked robot chasis, motors, sensors, communication and mechanics. I thought about using raspberry and arduino as platforms for ...
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1answer
176 views

Difference between planetary and precision gear motors

i'm working on a building a rover and would like some advice on selecting motors. In particular, i want to understand the difference between precision and planetary gear motors. My robot will way ...
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2answers
77 views

Driver Board to Control 16 Brushed DC Motors

I am building a humanoid robot with DC motor actuated fingers. There are 16 brushed DC motors to be position controlled with help of hall effect sensors implanted at the joints of each fingers. I need ...
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1answer
493 views

Converting a linear acceleration command into a DC motor command?

I'm constructing a 2 wheels balancing robot which uses a PID controller. I've tuned my parameters on numerical simulations based on a continuous inverted pendulum system so that the simulated ...
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2answers
699 views

DC Motor PID control with unstable velocity feedback

Currently I am building a omnidirectional robot with 4 DC Motors with embedded incremental encoder. However, with a constant pwm input, i am not able to control the motor to rotate in a "relatively ...
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2answers
4k views

Drive motor voltage / other specifications of Roomba 650

I salvaged some parts off my dead Roomba 650, and I'm trying to use the drive motor assembly . I got the pinout of the connector but I don't know what voltage / PWM / other specifications are there ...
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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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1answer
99 views

What's the smallest rotation a brush-less motor can perform?

For example, I have a brush-less outrunner with 14 poles and 12 stator windings. It has three connectors. Can this motor be controlled in a way that it performs a single step of 30 degrees (360/12)?
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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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2answers
1k views

Building an open loop controller for a simple DC motor position problem

In order to identify the dynamics of my DC motor, I am trying to command it with Xcos using the Arduino tool box. The problem that I am facing is how to give the motor an input command such that I get ...
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3answers
411 views

Stallable motor - 100% duty cycle higher torque motor that can be stalled without burning up

I have a project where I need a motor that can turn some number of rotations which will spool up a cable attached to a spring-closed device to open it up. When power is disconnected, the spring ...
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2answers
59 views

How to run custom hardware from a laptop [closed]

I am looking to build some custom hardware (nothing too fancy, just some motors, cameras and the like), and I need it to be controlled by my laptop (its going to have to do a non-trivial amount of ...
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1answer
369 views

Ways of reversing motor direction easily

My set up consists of a brushed motor (ex cordless drill type) connected to a motor controller which is in turn connected to a LIPO battery and an r/c receiver. All my cables are fitted with XT 60 ...
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2answers
675 views

Eliminating Electrical Noise from my motor driver

Background: I am using an Arduino Mega connected to a RoboClaw 2x60A motor driver. I asked this question about the system, but I have since narrowed the scope of the problem. I tried adding a bunch ...
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2answers
64 views

Robotics advice needed

For a high school project I will be building a robot that will draw an image on a whiteboard for you based on what instructions you give. To accomplish this a motor will move the pen on each axis ...
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2answers
406 views

Dealing with position inaccuracy and latency in PID Loop

Background: I am new to PID, for my first PID project I am using a simple P-Loop and 300 degree linear potentiometers for position feedback. I am using the roboclaw 2x60A motor controller. The motor ...
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1answer
814 views

Battery system for a robot with a RaspberryPi or microcontroller

I'm building a robot which is actually a rotating ball. All my circuitry will be inside this ball. I'm using a Raspberry Pi as the brains. Apart from Raspberry Pi, I've an H-bridge IC (L298N), a 6-...

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