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
893 views

Is this a good quadcopter build? [closed]

3D CAD: After some editing: I'm building the frame myself from aluminum and polycarbonate. EDIT: all frame is polycarbonate except of the arms (and all screws & nuts & washers)), they are ...
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1answer
4k views

Low speed control of bldc motors

I'm having a problem with controlling my BLDC motor when starting up and when running in low rpm. I have a custom board to measure rotation of the motor using an optical sensor and send servo pwm ...
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4answers
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Will connecting two servo motors double the torque?

For my robot, I am using two continuous rotation servos to spin a threaded rod. I am trying to make this project as cheap as possible. Here are the servos that I can find: Servo #1: This is a very ...
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2answers
1k views

Odd L293D behavior: Pin 16 seems to act as enable

I have a chip that is labeled L293D with a small 'ST' logo, which does not behave like I believe a L239D should: I have the chip on a breadboard with pins 4,5,12 and 13 connected to the ground rail. ...
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3answers
548 views

How are the optical encoders used in platforms like Rover 5?

I just got my rover 5 chassis with 4 motors and 4 quadrature encoders and I am trying to utilize the optical encoders. I know the encoders generate pulse signals which can be used to measure speed and ...
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2answers
472 views

Mechanism for changing gears on a bicycle

I'm looking to make an automatically shifting bicycle for my senior design project (along with some additional features TBD). However, I come from an electrical/software background; not a mechanical ...
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1answer
1k views

Effective motor type for robotic arm?

I am trying to build an arm that will have about 5 by 5 by maybe 7 or so centimeters of room for a rotary motor capable of lifting it. The joint will basically allow the arm to rotate in a single ...
2
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1answer
1k views

Controlling a conveyor belt with a time based motor

I have some crude time based motors taken from a robot arm that we upgraded to proper servos. I want to be able to power a conveyor belt with one of them and I was wondering how I would go about the ...
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2answers
479 views

Why do 1000 rpm and 10 rpm DC motors cost the same? [closed]

Today I was going to buy a motor online, and saw that 10 rpm and 1000 rpm DC motors cost the same. How is it possible to change the rpm without requiring any additional parts cost?
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5answers
541 views

Arduino Motor control

I'm working on a rather low budget project, and need some way to control four or more motors using one Arduino. I've looked at motor shields a little, but I have a shield on top of it already, It does ...
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1answer
682 views

How to control a brushless motor?

I consider using a brushless outrunner motor, designed for helicopters, in my driving roboter. How can I control such a brushless motor with my micro controller? Of course I'll have a separate power ...
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0answers
303 views

Motor Controller with micro USB interface [closed]

I am a Robotics enthusiast and planning to make a small and simple four wheel car whose motors are supposed to be controlled by an Android device housed inside the car by means of the micro USB port ...
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2answers
187 views

Motor driver selection

I am building a 2 wheel robot to carry 7KG of load. I used this link to get the torque required for each motor which is 11Kg-cm. So I choose 2 of these motor which has 36Kg-cm(2x more) torque. I ...
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3answers
937 views

Reducing motor speed without jamming up

So I built three little bots so far. One with a raspberry-pi, (6V motors), one with an arduino (12V motors), and another with an arduino but a hacked remote car (7ish, volt motors): The problem I ...
6
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1answer
178 views

Do 6 motors require 6 individually-assigned batteries?

For the Dagu Wild Thumper 6 Wheeled platform, or any multiple motor system, do I really need 1 battery for each motor? Or should I just buy 2 for either side of the platform. In addition, for larger ...
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1answer
249 views

Does a vehicle with defferential gear still move straight?

I am in the concept phase of a driving robot. The two wheels on the front axle will be powered, while the rear will be dragged along. The rear is also responsible for steering but this has noting to ...
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1answer
118 views

funny behaviour or what - dc motor control

I'm trying to control the speed of this motor, with this motor driver and pic16f690. pwm in my program 5 kHz frequency (0.2 ms period) Starting with 50% duty ...
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2answers
2k views

H-bridges and stall current

For a DC motor with a stall current of 950 mA, what should the H-bridge's current rating be? What will happen if we use our H-bridge L293D whose max. output current is 600 mA?
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2answers
11k views

How do I calculate the required loop frequency for a servo controller?

I have a motor which drives a string connected to a load cell. I would like to implement a closed loop controller to control the load applied by the motor to the string. How do I go about determining ...
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1answer
368 views

automatic sorting with barcode identification inside a refrigerator [closed]

I'm endeavoring to prototype a challenging sorting mechanism inside a fridge and would appreciate any constructive tips on how to get from the specs to a plausible design. Problem The aim of the ...
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2answers
2k views

Does more “Power” (W) means better motor?

If a motor has more Power (W) from another it means that it is better?
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1answer
1k views

Upgrading the motors on a SeaPerch ROV - more torque, or more RPMs?

I am looking to upgrade the motors for SeaPerch underwater ROVs so we can carry heavier payloads and more equipment. My question is, should I look for motors which have a higher RPM and lower ...
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1answer
255 views

How do I interpret these specs for a motor and motor driver?

I ran into confusion while reading about motors. Consider a motor with these specs: Maximum motor voltage - 6VDC No load current - 250mA max. Stall current - around 1A I am considering using the ...
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1answer
2k views

Increasing the rotation range of a servo motor

How do I increase the rotation range of a standard servo? Most servos have a rotation range of ~ 180 degrees. I would like to access the entire 360 degree range on the servo, partially because I would ...
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1answer
1k views

How to get two continuous tracks (tank treads) to move at the same rate?

I've got a couple Vex 269 Motors hooked up to an Arduino Duemilanove. These motors run a some Vex Tank Treads. The two motors are run as servos on the Arduino using the Servo Library. The problem I'm ...
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1answer
802 views

How do I adjust objects on a conveyor belt into the proper orientation?

This is part two of my larger robot, it follows up what happens with the small rocks here: What kind of sensor do i need for knowing that something is placed at a position? Now i am taking the rocks ...
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1answer
362 views

How do I interface a TLC5947 with small motors?

This is a follow-up to this question: Prototyping a device with 25-100 small DC 3.0V motors, is Arduino a good fit? I've decided based on the answer that sending the control signals through multiple ...
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2answers
95 views

Why is this electro motor going slower?

From an old dust buster I've got this electro motor, the included battery pack and the charger: I ripped everything apart (the dust buster was broken) and the motor still works. After playing around ...
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2answers
329 views

Prototyping a device with 25-100 small DC 3.0V motors, is Arduino a good fit?

I want to prototype a therapeutic device that will have a lot of tiny mobile-phone type vibration motors like this one in it, and I want to be able to activate them in any configuration I want. I'm ...
2
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1answer
244 views

Perfecting Tripod Gait - Building a R-Hex Robot

I need help with figuring out the following things: I'm developing a hexapod R-Hex type model with a tripod gait. However, the angles obtained during the robot's walking in real life are not ...
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2answers
752 views

What is the opposite of 'Antagonistic'?

A robotic joint is connected to two actuators, e.g. air muscles. One flexes the joint, while the other extends it. This arrangement is called 'antagonistic'. But what if I had an electric motor ...
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1answer
301 views

How can I upgrade an existing robot with a higher torque, sensored motor @ ~100 watts?

I would like a high torque motor (37 oz-in @ 5760 rpm) for souping up a Scorbot 3 I bought. I really need it to have an encoder to count the number of revolutions and to allow high start-up torque. So ...
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2answers
848 views

Are power and torque required related in some way?

I am designing a new platform for outdoor robotics and I need to calculate the power and/or torque that is needed to move the platform. I have calculated that I need about 720 W of total power to move ...
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5answers
4k views

Building a controllable “knob”

I am trying to build a semi-analog timer. Something like those old egg timers that you rotate the face of. I want a knob that I can turn that can be read by a microcontroller, and I also want the ...
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2answers
2k views

Why does our LM2576 circuit suddenly cut down the power?

I have an LM2576 circuit plus an adjuster to adjust the output voltage, for controlling motor speed in a line follower robot. The circuit works great when adjusted to give out low voltages, but when I ...
4
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2answers
4k views

Choosing motors for 2 wheel drive robot

I am making a 2 wheel drive robot. Suppose I know that my robot is going to weight x kg when finished and I know the diameter of the wheels y (geared motors will be connected directly to the wheels). ...
12
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3answers
941 views

What determines the amount of noise an actuator produces?

Many robots and other mechanical devices produce the signature whirring noise as they move, some produce less. What makes the difference? What restrictions a silence requirement places on a robot?

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