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Questions tagged [power]

In physics, power is the rate of doing work.

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37 votes
4 answers
46k views

Quadcopter liPo battery weight/capacity trade off

I'm trying to find where additional battery capacity becomes worthless in relation to the added weight in terms of a quadcopter. Currently with a 5500 mAh battery, 11.1V, I can get between 12 minutes ...
Chris's user avatar
  • 1,005
19 votes
3 answers
3k views

What is the best way to power a large number (27) servos at 5 V?

I apologize if this question may sound a little vague. I am working on a robotics project that will contain 27 servos of various sizes and I am having trouble figuring out how they should be powered. ...
user avatar
8 votes
5 answers
580 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 ...
Dylan Katz's user avatar
7 votes
2 answers
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 ...
Miro Markaravanes's user avatar
7 votes
3 answers
2k views

how to power extra usb devices for beaglebone black

I'm building a robot that uses a beaglebone black, however I have several different usb devices that I want to connect to it (microphone, usb sound device and some other things). Now I have heard that ...
Thijser's user avatar
  • 303
7 votes
2 answers
5k views

I want to control a sewing machine motor; need help with choices

I've got an industrial sewing machine (think "can sew with thread that looks like string, and has no trouble pounding through 20 layers of Sunbrella fabric"); it's got a 1 HP motor to power it. (I've ...
John's user avatar
  • 179
5 votes
3 answers
112 views

Single power source for electronics and actuators

It seems popular to build robotic systems with separate supplies for the electronics and motors/servos, but what would be involved in a circuit that powers both from one source? If it helps, here is ...
Crunchy's user avatar
  • 161
5 votes
1 answer
399 views

Powering down servos completely in RobotC+Tetrix

For a certain robotic application (actually for the FTC challenge this year) our team is performing an operation where a servo-driven arm could potentially be forced into an unknown position. We are ...
nanofarad's user avatar
  • 183
4 votes
3 answers
450 views

Best power solution for my robot

I've built quadruped robot which is using 12 servos (TowerPro SG90 Servo) and Raspberry Pi (model B 1). Right now I'm "feeding" it with 5V 2.5A charger. How can I make it un-tethered? What should I ...
sssemil's user avatar
  • 143
4 votes
3 answers
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 ...
Tanvir Rajeev's user avatar
4 votes
1 answer
4k views

How can I power a wheel but let it spin freely when not under power?

How can I power a wheel but let it spin freely when not under power? I saw the question How can I modify a low cost hobby servo to run 'freely'? but I'm more interested in knowing if there is ...
cwd's user avatar
  • 143
3 votes
2 answers
342 views

Can high voltage power lines provide a super highway for drones?

Is there a way to convert the EM field that surrounds high voltage power lines for direct usable electricity for air or ground drones for continuous flight or travel? Added: Yes could the EM field be ...
Muze's user avatar
  • 1
3 votes
3 answers
938 views

Can we simulate a actuator with a very strong torque with a PID controller

I use gazebo to simulate a robot arm. To control its joints, I use PID controllers. As you might know, PID are sometimes pretty hard to tune and this is the case for a robotic arm. To avoid any tuning,...
Robin's user avatar
  • 133
3 votes
3 answers
2k views

How many amps do I want my Switching BEC to provide?

I'm trying to power 7-12 servos, and I was under the impression that each one would need about an amp, but in looking around for an appropriate BEC to supply them, I notice that most seem to output ...
Khrob's user avatar
  • 293
3 votes
1 answer
86 views

High power jumping mechanism in small robots

I recently saw this video on YouTube featuring a jumping robot: 5 Fastest Robots In The World I was curious how this is accomplished mechanically? Do they wind a strong spring or use some sort of air ...
FutureCake's user avatar
3 votes
2 answers
14k 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 ...
Eric Leibenguth's user avatar
3 votes
3 answers
2k views

Why do my ESCs stop working?

I'm new to robotics and this is my first time building a quadcopter. I'm unable to work out why I keep losing ESCs. Most recently in testing, I've managed to calibrate all 4 ESCs and accurately ...
Biscuits's user avatar
  • 217
3 votes
2 answers
8k views

Choosing correct power supply for Stepper Motors

I am building a machine and need 2 Stepper Motor for that. The motors are driven using by a 3.3v arm device. I have made the following selections regarding the stepper motor, stepper motor driver and ...
SteveIrwin's user avatar
3 votes
1 answer
721 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 ...
danijar's user avatar
  • 299
3 votes
3 answers
5k views

Supplying power from a power bank to an arduino and DC Motors

I have a two port powerbank capable of supplying a maximum of 5V 2.1A I'm using it to power an Arduino and a L293D IC connected to two DC motors which have the following specifications: Working ...
prajwaldp's user avatar
3 votes
1 answer
917 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-...
Tejas Jadhav's user avatar
3 votes
1 answer
311 views

lithium thionyl chloride batteries to generate 20A @ 14.4V

I am building a robot where power density is critical, and looking into using lithium thionyl chloride (SOCl2) batteries. I will be drawing around 20A constantly and need between 12 and 17V. The ...
foobarbecue's user avatar
3 votes
3 answers
580 views

How to get constant motor RPM regardless of battery voltage?

I have a brushless motor with a propeller attached, driven by an ESC and a LiPo battery. I noticed that as the battery level drops, the motor spins slower, which makes sense. My question is is it ...
Johnny's user avatar
  • 41
3 votes
3 answers
308 views

Powering multicopter with multiple dedicated batteries

I am in the starting phase of building a fairly large octo-copter drone. I am currently thinking about the possibility of powering my octo-copter design using 4 separate batteries where each battery ...
RalleGAB's user avatar
2 votes
4 answers
42k views

Does the mAh of a battery mean longer power or more power?

If a Lipo battery has more mAh will it be slower to run out of energy or will it have larger power output? Thanks in Advance
Ben's user avatar
  • 63
2 votes
1 answer
398 views

Powering a multirotor with dedicated batteries for each motor

I'm currently thinking of extending the battery life of my quad by powering each motor and ESC individually. I will be using 1 dedicated battery for each motor, and 1 dedicated battery for the flight ...
Kenneth .J's user avatar
2 votes
1 answer
1k views

How are huge industrial robots powered?

Take a look at this monster lifting a car. Now I don't think one can get that power by plugging into a wall outlet. So how are these huge robots (their servos) powered? Gasoline? How is power stored, ...
JDS's user avatar
  • 429
2 votes
3 answers
5k 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 ...
Chad K's user avatar
  • 121
2 votes
3 answers
455 views

How to create a stable 48V 10A power supply?

I'm shopping for batteries and it's easy to find a 48V lithium ion battery that has like 30A max continuous discharge rating. However, I know that the battery supply has a variable voltage from 54V - ...
aztrorisk's user avatar
2 votes
1 answer
90 views

What battery capacity would be required to run a component for an hour?

I have a 9.8kW Component that runs at 51.8 Volts. That means I need a battery that has about 9.8kWh of energy to run the component for an hour For the sake of simplicity, say I have some batteries ...
tuskiomi's user avatar
  • 195
2 votes
1 answer
1k views

Stepper Motor: Direct Drive vs. Belt Drive vs. Geared Stepper Motor

I have built a juggling machine. Each arm is driven by a 4A 23mm stepper motor. The motors are each driven by a TB6600 set to 800 microsteps. By trial and error, I have found that the motors skip when ...
Stephen Meschke's user avatar
2 votes
1 answer
170 views

Motor driver damage and jerking behavior when load driving in same direction as motor

I'm having trouble with a gear motor being powered by a power supply, while it is being driven by the load in the same direction as the driver wants to drive it. Here is a simple diagram: The gear ...
user3596565's user avatar
2 votes
2 answers
418 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
user3725099's user avatar
2 votes
2 answers
486 views

Calculating thrust generated from electric engines

I wanted to calculate the amount of thrust generated from the engines. I am using the blade 180 cfx model. http://www.bladehelis.com/Products/Default.aspx?ProdID=BLH3450#quickSpecs After some ...
tanuj Jain's user avatar
2 votes
1 answer
441 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 ...
Excrubulent's user avatar
2 votes
2 answers
1k views

Am I calculating my drone's power consumption right?

I want to make an drone with these motors: https://www.amazon.com/XtremeAmazing-2200KV-Brushless-2212-6-helicopter/dp/B01M3UBGU9 1: First of all, are they good? If not, could you suggest me other ...
Vincent Quirion's user avatar
2 votes
2 answers
102 views

problem of power on PIN 1 and PIN 2 of DIN connector of Roomba 521

I notice there is a problem of power on PIN 1 and PIN 2 of DIN connector of Roomba 521...I have only 0,5 V but it's expected 12V...motherboard damaged?
Daniele Velardi's user avatar
2 votes
1 answer
1k views

How to calculate power supply requirements for Closed Loop Stepper Motors?

I have a CNC Router table that has 4 Nema 23 stepper motor (open loop). I want to upgrade the machine and use 4 Neam 34 Closed Loop Steppers. These are the motors and drivers I'm considering: Steppers:...
oscarm's user avatar
  • 121
2 votes
1 answer
146 views

Switching from wall power to battery and back again

I'm in the final phase of my BeerBot* project, and I'm looking for the best way to power it. BeerBot will spend most of his life sitting in a docking station, keeping his battery charged and running ...
Jeff Loughlin's user avatar
2 votes
1 answer
207 views

Measure 2 diffrent battery voltages on arduino

Is it possible to measure the voltage of 2 different batteries on arduino? Currently I am able to use a resistor divider / voltage divider of 2x 10K resistors to an analog pin to read the voltage of ...
Alex's user avatar
  • 143
2 votes
1 answer
43 views

Extending iCreate battery power for auxilliary equipment

I plan to use the icreate as a platform to carry a tablet, or notebook PC and want to have power for some time so I need more than the 3000 mAh battery. I want all to be powered from same battery ...
Nickfixit's user avatar
2 votes
1 answer
154 views

Comparison of the efficiency of DC motor current limiting / control methods?

I am using the wheels and motors of an RC toy car as a simple robotics platform. The car has 2 motors, one drives the back wheels, the other steers the front wheels. The steering motor is stalled by ...
user avatar
2 votes
0 answers
115 views

McKibben artificial muscles and the 400:1 ratio

I was recently reading that those artificial muscles had the highest power/weight ratio while electric motors only have a ratio of less than 100:1. As electrical engineer I have never worked with ...
Mehdi's user avatar
  • 681
1 vote
4 answers
501 views

Passing power through a motor

How would one go about passing power through a motor? Let's say we have some basic robot which has a motor that slowly spins a limb, on each end of that limb, there is a motor which again spins a ...
Adam K Dean's user avatar
1 vote
4 answers
2k views

Is it possible to use a LiPo charger as a lab bench power supply?

I recently thought about building a lab bench power supply, it comes in cheaper and I love to build things... But then I also have a LiPo charger an iMax B6AC, that I had bought for my quadcopter, ...
SidS's user avatar
  • 248
1 vote
2 answers
175 views

Are robot's codes usually compiled or interpreted?

I would bet that usually these are compiled for better performance, and of lawful reasons (make it harder for any user to save code without decompiling), though I'm not sure. In any case, I believe ...
user avatar
1 vote
2 answers
3k views

Does more "Power" (W) means better motor?

If a motor has more Power (W) from another it means that it is better?
Dan Barzilay's user avatar
1 vote
2 answers
65 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 ...
SidS's user avatar
  • 248
1 vote
2 answers
104 views

Powering 6 servomotors requiring 6V and 2A each

The title pretty much says it all. I'm on a team that is currently building a robotic arm for the capstone project of my engineering degree, our design is similar to the Dobot (5 degrees of freedom). ...
Emzam's user avatar
  • 11
1 vote
1 answer
90 views

Understanding how solar panels can supply power to robotic circuits

Say I have this solar panel that outputs 6V at 330mA, or ~1.98 Watts. If I connect that to Arduino, which expects a 5V supply at (roughly) 50mA, then the Arduino as a whole requires 5V * .05A = 0.25 ...
smeeb's user avatar
  • 219