Brushless Motors

I have a few fans around from computers. Seems that 3 wires is pretty common for these. I wasn't sure which was what, so, I figured "nothin to lose" and hooked up the right voltage across 2 wires. My guess was right. It ran. But, having 1 out of 9 fanblades busted off, it shook a bit. So, I busted off 2 more blades to balance it. But now, even connecting it the same way, it doesn't run. So, how should a 3 wire brushless motor fan be wired?

Topic by Toga_Dan 4 years ago  |  last reply 4 years ago


what is a brushless motor? Answered

Question by ms10 7 years ago  |  last reply 7 years ago


brushed to brushless!

If you have been flying your RC planes a lot and have found them getting a bit boring, go brushless and get lithium polymer cells. brushless motors are lighter and twice as powerful as brushed. lithium polymer batteries hold the most electricity to weight ratio compared to standard Nicd and Nmh. Dont believe me look at your cell phone open the battery hatch and take out battery its probably a Lithium polymer or lithium ion notice how light it is and small it is now look at the volts/ mAH pretty amazing hu? Got a laptop it probably got a lipo to. you want to make the switch but dont know what motor, battery, ESC (ESC-electronic speed control) to get, just ask and ill give you a hand! i will need to know the motor and battery that came with the plane/ or that u are using. Are you flying glow (gas powered) and wana go electric? i can help u out their too! Their are 2 kinds of brushless motors outrunner and inrunner whats the difference? well outrunners spin slower with more power so it acts like it has a gear box (this eliminates the need for a gear box reducing weight and noise) it also has a different design (look at pics). inrunners have a brushed appearance but their much lighter and more powerful u might need a gear box through. update 2/20/08 new image added (not all comment boxes are working)

Topic by i make shooting things 11 years ago  |  last reply 10 years ago


Motors for Quadcopters

Hi, I am looking to make a quadcopter as my university project and I kinda run in to some problems deciding which motor I need to choose. I was thinking to choose brushless motors as they are more efficient and they give more RPM. HOwever, my professor says that there's no point using brushless/stepper motors as u can get the same RPMs using brushed motors and its the same thing. Hence, can anyone please guide me which motor is best to use and why should I use brushed or brushless motors. I shall be very glad if someone guide me through it. Thank you :)

Topic by Bam Boy 5 years ago  |  last reply 5 years ago


How to power a brushless motor

How can i power a motor like this (with 3 pins) just to max speed? it's for a propeller clock. thanks

Topic by bfernandes1 5 years ago  |  last reply 2 years ago


power tool brushless motor

I want to replace the motor in my dremel for a brushless one and i just need some help in deciding which one to get. I also want to possibly upgrade the motor in my drill. The drill is only used for wood and i don't mind if either the drill or the dremel needs some kind of gearbox to get the most power from it. It would also be nice to know something about larger brushless motors as there doesn't seem to be much about them on the internet. Thanks in advance.

Question by monty324 6 years ago  |  last reply 6 years ago


Brushless motor upgrade for exceed?? Answered

I have an exceed sunfire buggy 1/10th and I am planning on getting a brushless upgrade. I don't know if the battery and car itself can handle the one i want. I have a 7.2v 4200mahNiMh battery pack and the motor I  want to get is a 5.5T 6000kv motor. I was wondering if anyone knew if my car could handle that. If it couldn't, would a 8.5T 4000kv motor be better? And how fast would the second motor go? Please comment soon if you know anything about these motors.

Question by Electroinnovation 9 years ago  |  last reply 7 years ago


Homemade Brushless Micro motor

I want to make this https://www.youtube.com/watch?v=Ft39Rdp_53w  Micro motor for my indoor plane, Anyone know how to make ?

Topic by DamienP7 3 years ago  |  last reply 3 years ago


Motors, time and boredom

I have been collecting motors for a while now, and have no idea what to do with them. They range from 5-12VDC, brushed, brushless, stepper, etc. Any potential ideas for projects would be appreciated.  Thanks!

Topic by dansassin 3 years ago  |  last reply 3 years ago


what makes brushless motors so special?

Question by loki17 8 years ago  |  last reply 8 years ago


A basic (very basic) description of a Brushless DC motor.

So... before I start... I am not a physicist, nor am I an electrical engineer. Hopefully someone within one of those (or both) professions will chime in and enrich this discussion. That said... I'm going to be using leyman's terms. This thread is specifically meant to explain how a brushless DC electric motor exerts a force, and how that force is used to generate work. To start off, I'd Like to explain the components which comprise a brushless DC motor: First... You have an axil. The axil's purpose is to spin. Next you have natural magnets, or solid state magnet; I use the terms somewhat incorrectly, since a natural magnet refers specifically to nickel or ferrous base magnets, but there exist a large variety of compounds and composites that exhibit the ability to produce magnetic fields. In practice you have many in a motor, but for our purposes... we can pretend we have one. The natural magnet's job is exert a magnetic field while attached to the axil. After that we have an electrical coil. Once again, in Brushless DC motors, we have many of these, but for our purposes we'll use 3. The electrical coil's job is to produce a magnetic field which can move in a circle. Finally we have the engine housing. The purpose of the engine housing is to hold everything together. Note: I'm intentionally leaving out the computer control mechanism. there are alot of great instructables on microcontrollers. Most Brushless DC motors requrie one to work since there is no mechanical timing device, as there is in a brushed engine. So... how does this fit together? In this setup the natural magnet produces a force when next to the electrical coil (This coil is also known as an electromagnet). This is because the charge of the coil is opposite to the charge of the natural magnet. Once the Natural magnet and the electromagnetic coil align with each other, the first coil shuts off and the second turns on. Once again the natural magnet is drawn towards the magnetic pole. This process repeats until the natural magnet has spun in a circle (note: usually you want it to continue to spin beyond a single revolution.) That's the basic (very basic) idea behind a Brushless DC Motor.

Topic by Qcks 11 years ago  |  last reply 11 years ago


would this motor produce electricity? Answered

I made a bike generator and I want to add a brushless motor to it so I wont need to replace it or the brushes. I am looking at the brushless motor at this link.

Question by TOCO 9 years ago  |  last reply 9 years ago


Can someone walk me through the math of not exploding a 12V rated motor with a 48V battery?

I have a machine with a 12V motor. I have a battery that supplies 48V. I want to run the machine with the battery and NOT have the machine explode.If I get a speed control that can handle 48V, is it a simple as making sure I don't run it higher than 25%?

Question by jongscx 1 year ago  |  last reply 1 year ago


Brushed in-runner to brushless out-runner?

Question by c--b 8 years ago  |  last reply 8 years ago


What choice of motor for a robot

Hello, I'm making researches about electric motors, I know very little about them and it seems to be a vast world. I don't have any detailled project yet, but I'd like to make a small robot that would be capable to move, that implies using electric motors. Forums have many useful data about them, but what it lacks is precise user reviews: what type of motor would you use the most, and why? Is it simpler to use servomotors over DC, or brushless? Prics must be a criteria of choice, but can I found cheap motors with good performance? Thank you very much for your help

Topic by armandbon 2 years ago  |  last reply 2 years ago


Do brushless motors produce electricity?

 I built a bike generator. My science teacher recommended installing a brushless motor instead of my brushed one. 

Question by TOCO 9 years ago  |  last reply 9 years ago


how do i make a brushless motor out of a dc motor? Answered

Question by RcMaKeR 8 years ago  |  last reply 8 years ago


Brushless motor not running,help needed..!!!

I have Turnigy 2836, 2350Kv outrunner connected to Hobbyking 40A SBEC ,Rhino 1550mAh 3S 20c Lipoly Battery and a Hobbyking servo tester to control the motor .when i try to start it makes two beep sound, vibrates and turns off.it was perfectly running last time i checked .which components' fault is this??? and how to check lipoly's voltage and current?can i use normal multimeter? thanks for the suggestion....

Question by ferraririder123 5 years ago  |  last reply 5 years ago


Would this brushless motor produce electricity? Answered

 I made a bike generator but the brushes went out. Would this motor produce electricity? I will put it in some sort of protective housing. So here is the link.

Question by TOCO 9 years ago  |  last reply 9 years ago


Can I make helicopter with cd rom brushless motor and is there is any cheap brushless motor driver IC??

I was trying to do a helicopter. When I search internet about that all I found was done by using brushless motor with a module  that costs really high, to me , as I'm a student. So I decided to use brushless motor of my CDROM. Can anyone help to make a helicopter by using this motor. And also I need to know about a Cheap Driver IC or something that acts as a control cirucuit for that brushless.

Question by prazanthkj 6 years ago  |  last reply 6 years ago


single phase ,brushless direct current motor.

Does anyone have the schematics for a VERY SIMPLE, (LIKE ME) single phase brushless DC motor.

Question by ianrbell 10 years ago  |  last reply 3 years ago


Speed controller for brushless electric bike motor? Answered

I have obtained a 400W 24V 2800RPM Monophase BLDC motor with related power supply and a 24V 40A-rated pulse width modulator unit, however from what i understand the PWM won't give me full control (if any at all) of the actual speed of a BLDC motor. I want my motor's torque to remain relatively intact and for it to cover a range of about 50-300 RPM, with no need for exact control. Are my only choices to build a pulley mechanism or to buy a mechanical gearbox? I'd like to control my motor electronically.

Question by Khalim 4 years ago  |  last reply 4 years ago


What would be an appropriate diode for a motor driver? Answered

I'm currently building a brushless motor driver, and need to get some diodes to go accross the MOSFETs to prevent the reverse current going through them. The absolute maximum forward voltage through the motor is 15V, at 25A, so do the diodes also need to withstand this, or can lower ratings, such as 10A be used. Thanks in advance.

Question by The Skinnerz 7 years ago  |  last reply 7 years ago


Can you make a brushless motor with "axial" cores and magnets, rather than radial?

In the picture, the black discs are magnets, the copper cylinders are coils, and the acrylic disc spins on the central shaft. 

Question by DrNerdington 9 years ago  |  last reply 9 years ago


Brushless Motor from Photocopier, what to do with them?

Hello! I salvaged these motors from one old Photocopier and i honestly dont know how to use them. Actually, my knowleadge about motors (and electronics in general) is really limited, my last achivement was building my own 3d printer from scrap materials and by doing that I learned a lot about arduino, NEMA stepper motors and associated drivers, all thanks to the awesome people who shares knoledge in this and other websites, but i am still struggling with electronics in general. So now, my question is... what can i do with these motors? Is there a way to control them with Arduino? Any kind of imput would be appreciated. I found the datasheets online but i really dont know what to do with a datasheet... Thanks in advance and sorry if my english is a bit weird, it's not my native languaje!

Topic by Goth.Cat 3 years ago  |  last reply 3 years ago


whats the best motor and ESC to use for a high torque r/c tank?

I am currently building an r/c tank, but i am having trouble finding a suitable motor and ESC that will allow it to go realy fast ( high speed tank). all i can find are brushless motors that require 30A at 6-12v, the same goes for the esc's, and i have no idea were to get that sort of power as i only have access to a 9.6v 750ma battery but i can get sealed, lead-acid batteries, at around 12v and 3amps, but thats still nowhere near what i need. does anyone know where i can get a brushless motor that can have at least 30kg of torque @ at least 1500rpm, that can run off 1A 9V?

Question by oldmanbeefjerky 8 years ago  |  last reply 6 years ago


Power steering motors?

Does anyone have experience with brushless power steering motors? As I understand it, they follow & enforce the steering wheel motion. How is the power rating? I assume there is gearing and electronics involved, but it might be part of the package... Might this be a useful motor for an e-bike/ scooter or a motorized wheelbarrow?

Question by BobS 8 years ago


Hard drive motor scavenging

Hi ! I was wondering, I saw some projects using 2,5" Hard drive brushless motors but I don't get exactly how do we manage to take them off their casing ? They seem strongly fixed and I don't see any screws holding them... Can someone help me on this ?

Topic by speakingcake 4 years ago  |  last reply 4 years ago


How to use an external power supply instead of batteries with ESC and brushless motor? Answered

Hello, everybody, this is my first question here ! Recently I have made a remote controlling system for my friend's RC plane, the problem is we want to test it on the ground without batteries.. So, I told him we can use an external power supply that gives 12V, but we can't calculate the needed amperage(? A) ... We'll be using EMax 18A brushless motor + Emax 30A ESC , all of these are using 11.1V, so what and how can I calculate the needed specifications of the required power supply ? I wish you could help me, and thanx :)

Question by Hawk-Eagle 3 years ago  |  last reply 3 years ago


Use brushless DC motor (or stepper motor) as RPM sensor?

Hi all, I'm making an Arduino based digital instrument cluster for my 1980 XS400 motorcycle. all the old tach and speedo instruments are mechanical so I need to convert the spinning cable's rotation to digital RPM. I've tried IR tachs but I can't seem to get them to be accurate enough (the lowest RPM I could get out of them was about 375, which isn't low enough) I'd love to use a more mechanical means of getting the RPM. could I use a 3 phase DC motor to count RPM? if I can, how?

Question by AedanGraves 2 months ago  |  last reply 2 months ago


how is ac current generated? Answered

Ok, so I was under the impression that brushless motors were AC motors (and therefore conducted AC current), until recent internet searches proved me wrong. I am curious how AC current is conducted, is it conducted using brushless motors? Or is it a different type of motor that will generate such electricity?

Question by A-Nony-Mus 8 years ago  |  last reply 8 years ago


How do you control the speed of an AC BRUSHLESS motor? (Used on a scroll saw)?

I have a small scroll saw i would like to build a cheap speed controler for It uses an AC motor which appears to be brushless when i dismantled it Could anyone tell me how brushless AC motors work, and how their speeed controlers work (i assume you need to change the phase of the ac current) Many thanks Chris

Question by ooda55 7 years ago  |  last reply 1 year ago


E-Bike motor selection, would it work? Answered

Im thinking of building an ebike, but unfortanately im stuck at the motor selection. I was just thinking, if you use 250W brushed motors for them, can this motor be used... If yes , just how to use it for a chain drive E-Bike? Any help will be greatly appreciated.

Question by robobot3112 1 year ago  |  last reply 1 year ago


Hard drive spindle motor repurposing

I am in the materials-gathering phase of a planned project to build a handheld stabilizer system for use with my dSLR camera when I shoot video (for an example of what that kind of is and does, look http://freeflysystems.com/products/movi/m10/).  I have a number of older or decommissioned hard drives and optical drives laying around and wondered if I couldn't repurpose the motors from them to use as the axis motors for my stabilizer.  The SimpleBGC board from Alexmos is built to drive brushless DC motors such as the spindle motors found in hard drives.  My questions would be if this would work and whether they would be "strong" enough to turn and hold the camera carriage according to the controller's signals.

Topic by brian.ragle.1 4 years ago  |  last reply 4 years ago


How can you tell if a motor is brushed, brushless, or a stepper?

I am trying to buy speed control but being that this is my first time building a battle bot when i bought the motors i just bought some motors off of ebay. Unaware, that there was much more to this aspect of the bot. Thank you in advance.

Question by DaNerd11 10 years ago  |  last reply 3 years ago


Can any brushless outrunner motor be used as a gimbal stabilization motor?

From looking at the construction of the gimbal motors, they do not appear to be much different than a standard brushless motor. However, they are able to be controlled like servo's, and I do not understand how. Does anyone have experience at these? I do not understand how a motor ment to spin fast with lowish torque, (high KV, as some may call that, or think of that) can be used to precisely control position, other than downwearing and feedback control. https://www.youtube.com/watch?v=hEWLrnYxLl0 Here is a video showing what I mean. Notice how slow that motor turns without gears? and I know they must have a lot of torque to be stabilizing a hefty camera.

Question by -max- 4 years ago  |  last reply 3 years ago


How can I hook up a VCR video drum motor to a microcontroller or other power source, without the big VCR circuit board? Answered

It is not a DC motor, I think it is a brushless motor. It's the big round one that moves the the tape.

Question by -henry- 9 years ago  |  last reply 9 years ago


how to choose the proper power supply to ESC? Answered

Hello , it's my first time posting here and i hope i have help i have a brushless motor with ESC rated as 30 A max i tried to connect it to a 12V- 125 A power supply but the ESC was burnt i wonder why did this happen ? i was told that the ESC will take the current it needs from the power supply and there are no problem to connect them together can anyone explain what happened to me?

Question by mmokhtar2 4 years ago  |  last reply 4 years ago


How do I choose proper power supply for my ESC Answered

Hi, I am very new to this, I apologize if my question is too stupid :) I bought a brushless motor: https://www.amazon.com/gp/product/B01FTX5S0E (I can't find proper specifications, so I am not sure what is the voltage for this, but somewhere on the internets it was mentioned that this model needs 11.1Voltage, and 15-25A or 30A max. (not sure how to check if that's accurate, the motor is RS 2212-920kv) I also bought an ESC (I hope it's correct one...) https://www.amazon.com/gp/product/B016KF0E2W/ it says 30A on it. So seems legit to me. Usually they power this setup with batteries. but I want to use a power supply to power this from 220v outlet. I have some power supplies at home rated 2A, which I am sure is not enough. so I assume I need to get a 12v 30A power supply.  I am afraid though that my assumptions will get me to burn my ESC, which will cause another month of waiting for new one. Would really appreciate some help. What power supply do I need? how many volts my motor requires? should I provide 30A? does this kind of supplies even exist?  Thanks!

Question by AvetisZ 2 years ago  |  last reply 2 years ago


can i make a simple brushless motor controller? 12v pc cooling fan with a red, white and black wire. cant make it run!

Hi I need help with a pc cooling fan. i know its brushless and has 3 wires but i dont have a clue what driver/controller i need to make it run. help

Question by 9 years ago  |  last reply 8 years ago


airborne Micro generator from nitro rc 40 motor / 400kv outrunner / smart charger / lipoly

Concept : design onboard lipoly charger system to extend flight time on giant scale electric plane.  1) if this is even a worth while project, the trade off of course is weight / power ,      can enough be created from a micro generator to make a differance, or would additionals 6 cell lipoy be more sensible ,  configuration =   OS max 40 nitro motor /  brushless 400 kv outrunner / ac / dc conversion rectifier / dc voltage regulator / 12v dc lipoly balance charger to main bank of lipoly batteries /  motors 2) I don't know how to build the rectifier bridge, so I would need some direction  Any suggestions or thoughts on this project are appreciated.  Jeff

Topic by JeffR135 1 year ago


how can we power up brushless motor from broken hdd?

I have a couple of broken hdd from dekstop or laptop.I've remove the magnet for other thing,but i can not find a "simple" way to use the spindle motor for something usefull...thanks....

Question by annurro 9 years ago  |  last reply 9 years ago


How do i increase the speed of an electric bike?(Motor in hub)

I know you need to increase the power going into the motor. I don't understand exactly how? I know that a different battery with higher voltage output should work, but is there any other way? If so, how and what would I need? I trust that you guys can come up with something. P.S I am aware of the potential danger of the motor if I increase too much.

Question by ClaynEva 7 years ago  |  last reply 2 months ago


How to choose wire gauge for Brushless DC motor?

I'm planning to build a Brushless DC motor, with inrunner perm mag rotor and stator on the outside. How can i determine the proper copper wire gauge for the stator windings? How much current will the motor pull? At first i thought it was just "Power = Voltage * current", so knowing the power and the voltage i should be able to figure the current. However, when the motor is spinning it generates back EMF, which counters the applied voltage and diminishes the current. At no load, the motor should draw no current for an ideal motor, and only a small current in real life to overcome friction and losses. In any case it would be much lower than the nominal current. So, for instance, a 1000w motor at 50v should draw 20A nominal, but in most situations it would be less than that? How much is the starting current, when you have to overcome inertia/tire friction? I know the motor can take higher currents for small amounts of time, before it gets too hot,but how can i determine what will be the "average" current. Is there a rule of thumb that motor designers use?  Also, the amp rating for each AWG seems to vary a lot. Some places list a conservative rating that is used for home wiring. But other places list much higher currents. If the stator is on the outer side and exposed to air, how much current can the copper handle for each AWG? Any insight will be appreciated, thanks.

Question by SlickT 2 years ago  |  last reply 2 years ago


V-22 osprey tilt rotor aircraft model

Hi i'm new to rc planes and drones so im making a model of v22 osprey tilt rotor aircraft i'm using the following components Arduino Mega 2x 2217/6 2300 kv brushless motor 6x micro servo for surface area control 2.4 ghz tx/rx fsct6b 6dof for stabilization i need help in controlling the bldc motors and servo by arduino mega using the 2.4 ghz tx/rx 

Topic by Daveluv1 3 years ago  |  last reply 3 years ago


Building a genertor? Answered

I have a 5sme22nj028a general electric motor and wanted to buld a generator. It is 10 pin (not including earth). I have used a voltmeter to see what generate but there are many combonations and they all seem to generate. Also it is brushless. I have posted this question before but fogort to include that the motor says varable speed on the side. I was thinking that connecting diffrent pins would make the motor go at diffrent speeds. In my other question someone said that it may need a mirco prosser before it. I think that this is probaly the case but wanted to see if anyone knew about this motor. So if it needs or doesnt need a micro prosessor before it, please tell me. I should be able to work it out from there. Thanks

Question by David97 7 years ago  |  last reply 5 years ago


Does anyone know how to convert the three phase output from a brushless motor/generator into straight DC voltage?

I would like to pedal the brushless motor/generator to drive a propeller powered by the resulting voltage Thank You?

Question by adamalbert 7 years ago  |  last reply 7 years ago


Pulley set for a 150rpm motor (small rc car project)?

Hey, I'm building a a car for a small competition in  my university (really small, like 3 teams) The motor they are providing for the car is a small dc motor, 6v, 1.7A and 150 RPM (there's no info about the torque). We have access to a 3D printer and wanted to print 2 pulleys to decrease the speed and gain strength (so the car can move), but I have no idea on what pulley size to use, what rpm should we aim? I know that without torque there's not much to say without testing, but any of you have at least a reference? thanks!

Question by Kokkan 3 years ago  |  last reply 3 years ago


Getting an ESC to work with arduino

Hello every one, I need to know if its possible to communicate between an ESC and an arduino. I would like to use a tilt sensor measured by the arduino to control a brush-less motor through an ESC. I'm not sure if this is possible but if so what would be a good way to go about doing it? Thanks for any help

Topic by Daniel Quintana 2 years ago  |  last reply 2 years ago


ESC,Battery,Motor selection for quadcoter

Hi, I am a beginner to build a quadcopter. so please help me in selecting ESCs , lipo Battery and Motor to make my own. I details of the parts are listed below : Brushless Motor : Brand: Racerstar Item name: BR2205 2600KV Brushless Motor RPM/V: 2600KV Height: 31.5mm Width: 27.9mm Shaft diameter: M5 Motor mount hole size: M3 Weight: 28 grams Voltage: 2-4S Battery: 2-4S lipo battery Max.current: 23.2A Max.power: 710W Internal resistance: Ω Usage: for 250 260 280 Multirotor Frame Kit Lipo Battery : Brand : Lion power  Configuration :  3S 11.1v Maximum continuous discharge rate : 30C Capacity : 4200MAH ESC : Sustaining Input Voltage: 6-12V BEC Output Current: 5V/3A Continuous Output Current: 30A Max Current: 35A/12s  I just tested a brushless motor mentioned above with the esc and battery while the motor is running for about 10 seconds the esc is burnt.So is to possible to build a quadcopter with the parts listed above please help. Thank You

Topic by rsudhar00123 1 year ago  |  last reply 1 year ago