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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votes
1answer
236 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 ...
4
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2answers
713 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 ...
16
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4answers
7k views

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 ...
9
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2answers
766 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 ...
5
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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 ...
7
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5answers
529 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 ...
8
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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 ...
8
votes
1answer
292 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 ...
7
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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 ...
14
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1answer
1k views

Will turning an NXT motor by hand damage it?

I have heard a lot of claims that manually turning an NXT motor by hand can potentially damage it. I was wondering whether this was at least partially true, and whether there is any evidence to ...
6
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2answers
4k views

Programming an ESC to have reverse mode

How do you program an ESC to have a reverse mode? We're looking to control an ESC from a servo board (for a robotics project). Assuming that the input will be between 0 and 255, we're looking for 127 ...
34
votes
4answers
100k views

What is stall current and free current of motors?

What are the stall and free currents of an electric motor? For example, this Vex motor lists its stall and free currents at the bottom of the page. I think I understand the general idea, but a ...
12
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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 ...
2
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1answer
284 views

Compatable ESC's with brushless 3 phase motors

Am trying to find the right ESC for the following two motors http://www.e-fliterc.com/Products/Default.aspx?ProdID=EFLM30180MDFA#quickFeatures http://www.e-fliterc.com/Products/Default.aspx?ProdID=...
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). ...
57
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2answers
101k views

Why are capacitors added to motors (in parallel); what is their purpose?

I've seen many motors having capacitors attached in parallel in bots. Apparently, this is for the "safety" of the motor. As I understand it, all these will do is smoothen any fluctuations--and I doubt ...
38
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11answers
48k views

Preventing leaks in motor shafts for underwater bots

Whenever building an aquatic bot, we always have to take care to prevent leakages, for obvious reasons. Now, holes for wires can be made watertight easily--but what about motors? We can easily seal ...
11
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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 ...
12
votes
3answers
928 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?
13
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2answers
346 views

How can I detect if a DC motor on a robot is starting to fail?

What characteristics can I look for which could be reliable early warning signs that a DC motor on my robot, say one used for the drive, could be failing? I'm looking for an answer that deals in terms ...

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