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Questions tagged [brushless-motors]

Use for questions regarding brushless DC motors.

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15 votes
6 answers
876 views

How does one hold the motor bell still when tightening prop nuts?

Almost all of the brushless motors used in hobby-grade multirotors have a single threaded shaft and rely only on friction between the propeller and motor to keep the prop from slipping. This means ...
FlashCactus's user avatar
  • 2,997
12 votes
3 answers
7k views

What does BEC, SBEC, UBEC, and OPTO mean for brushless motor ESCs?

I'm looking to purchase an ESC to go with a brushless motor. Many of the product pages include terms related to a BEC, such as SBEC, UBEC, and Opto. What do those acronyms mean and how should I ...
Daniel Ballinger's user avatar
12 votes
2 answers
1k views

What does KV mean on motors?

I've seen ratings on brushless DC motors like this one for something called KV. What does that rating mean?
ifconfig's user avatar
  • 6,008
11 votes
3 answers
9k views

How can I reverse the direction of a brushless motor?

I have a brushless motor on my RC plane. After connecting it to an ESC and testing it I've found that it is spinning in the wrong direction. How can I reverse the direction the prop is spinning?
Daniel Ballinger's user avatar
11 votes
1 answer
3k views

What do the numbers mean on a brushless DC motor?

Brushless DC (BLDC) motors can have a range of numbers on them: A four-digit number (e.g. 2212) A Kv number (already explained on this site) A number with N and P (e.g 12N14P) What do they mean?
Kralc's user avatar
  • 6,036
9 votes
3 answers
5k views

Can I run two motors off of one ESC?

Normally, a dual-motor plane has two ESCs but could I connect two brushless motors to one ESC? What would happen to the torque and speed of each of the two motors connected to the ESC?
Jacob B's user avatar
  • 5,792
8 votes
2 answers
18k views

Why do brushless motors have 3 wires compared to 2 wires on a brushed motor? [closed]

I'm familiar with regular DC motors, which is what brushed motors appear to be. They have fixed stator magnets, rotor coils connected to the shaft and two brushes that power the coils at the right ...
Daniel Ballinger's user avatar
8 votes
3 answers
191 views

Why does a brushless drone fly longer?

I have noticed that drones with brushless motors fly longer than those with brushed motors. Why are drones with brushless motors able to fly for longer amounts of time?
Jacob B's user avatar
  • 5,792
8 votes
1 answer
846 views

What is this ring attached to the bottom of this rotor shaft?

My motor came with a black ring attached to the bottom of the rotor. It spins along with the rotor, and it's not exactly a ring shape since it's open at one end - kind of like an omega symbol or like ...
Mark's user avatar
  • 183
8 votes
1 answer
127 views

Is there a method to wire a brushless motor to an ESC so it spins in the required direction first time?

So I know that three phase motors will reverse direction when 2 wires are swapped round, or that the direction can be changed in software (such as BLHeli). But is there a method to get it right first ...
RJBulger's user avatar
7 votes
1 answer
330 views

Does frequently changing the amount of power to a bldc motor wear it out?

If you had a brushless dc motor and kept it running but changing the power input every few seconds/minutes would it wear it out? I ask because for a drone like aircraft I'm designing, making turns ...
Gabriel Kusiak's user avatar
7 votes
1 answer
2k views

Grinding sound on FPV motor but no apparent damage

I have been testing a new brushless motor for an RC plane. It is a 2200KV motor controlled by a 30A BLDC ESC. I heard a grinding noise coming from my motor, as demonstrated in the following video: ...
frc_contributor's user avatar
7 votes
2 answers
132 views

One of my motor don't turn if throttle is raised too rapidly

I've recently have an issue with my quad. One of my motor don't spin if I raise throttle too rapidly. If i raised it slowly i the motor turn correctly. Only one of my motor have this issue and i've ...
Ruokki's user avatar
  • 191
7 votes
1 answer
186 views

How can I run 2207 2450Kv motors on 4S with 7” props?

I’m looking to use some spare motors I have to build a 7” rig. The problem is that they are 2450Kv, and I don’t want to burn out my other components. As I understand it, if I set a motor output limit ...
Drones and Whatnot's user avatar
6 votes
3 answers
2k views

What happens if i select the wrong number of motor poles in BetaFlight?

what kind of effect has on my gear and flights to have set a different number of motor poles that I actually have installed. for example, my motors have 14 poles but I set 12 on BetaFlight or vice-...
Paulino Gomez's user avatar
6 votes
1 answer
158 views

Help finding ESC for brushless motor

I'm very very new to hobby electronics however I have studied a bit about basic electronics in school. I have four EMAX 0802 Brushless Motors and I want to drive them with an Arduino Nano. I know that ...
James McGreivy's user avatar
5 votes
2 answers
362 views

Will different brushless motor sizes work with the same flight controller and esc

I recently built a 5-inch quad using: Diatone Mamba F405 Mk2 F40 Mk2 3-6S 30x30 Stack/Combo (F4 FC / 40A 4in1 ESC) Motors: iFlight Xing-E PRO 2207 1800Kv Motor with DShot 600 and 4S battery cell. I ...
Spesemper's user avatar
5 votes
2 answers
211 views

How can I increase the lifting power?

I understand the concept of lower KV bigger prop to increase the lifting capacity. But sometime that is not possible if your drone frame is just so big. For example I have a S550 I like to increase ...
Joseph Lim's user avatar
5 votes
2 answers
1k views

What is the performance difference between a brushless motor with a wider vs taller stator?

In the drone motor industry, there are a lot of variations in the stator sizes of brushless motors. There are several motors that have similar stator volume but one is wider and the other is taller. ...
Jacob B's user avatar
  • 5,792
5 votes
2 answers
142 views

Brushless Upgrade for RC Car

I was told that if my question was about motors and ESCs than it would be okay to put it on here even though it has to do with an RC car... I am wanting to do a brushless upgrade for my WLTOYS 12428 ...
Jacob Hornbeck's user avatar
5 votes
2 answers
128 views

Does motor KV requirement scale linearly with voltage?

There have been myriad questions regarding motor KV, such as this one. Many of these come close to answering my question, however none have given me a definite answer. If I am picking motors for a ...
Drones and Whatnot's user avatar
5 votes
1 answer
78 views

What battery/motor setup will replace this 1980s vintage glow engine?

I have a sport model (RCM Terrier, balsa/plywood construction covered with Monokote or Econokote stick/shrink film) that I built in 1984, and it has somehow come through multiple moves apparently ...
Zeiss Ikon's user avatar
5 votes
1 answer
201 views

How to clean dirt out of my miniquad motors?

I accidentally crashed my 250 class quadcopter into the dirt today and got dirt all over it, including into the motors. I managed to clean the dirt off of the frame and electronics, but I have no idea ...
ifconfig's user avatar
  • 6,008
5 votes
1 answer
243 views

How to recognize damaged brushless outrunner motors?

I would like to know how to recognize damaged brushless motors on a drone? What are the most common symptoms?
Ziem's user avatar
  • 579
5 votes
1 answer
371 views

ESC shutting down when motor loaded

I have a BLDC motor and a 300 amp ESC, The ESC shuts down after a few seconds at full load. The motor only draws 2 amps at full throttle, full load and the voltage only drops .5 volts. The battery is ...
edrummer's user avatar
4 votes
4 answers
717 views

Are there any extremely small brushless drone motors?

I have seen many tiny brushed drones, about an inch from motor to motor, and was wondering whether it would be possible to create a brushless drone that small. Are there any brushless motors available ...
Jacob B's user avatar
  • 5,792
4 votes
2 answers
488 views

How to limit the power of the brushless motor

I need to limit the power of my brushless motor at 700 Watts. How I can do it? I dont have a fix motor or propeller, for any configuration the max consumed power need to be less or equal 700W. The max ...
Arcaniaco's user avatar
  • 318
4 votes
1 answer
238 views

Lipo battery with an ESC and a BLDC motor

I'm not sure if I can connect four brushless dc motors to my Lipo battery. I don't know how to calculate it. The brushless motor I have is the Turnigy L2210C-1200 brushless motor (150w) and the Lipo ...
Isaac Varas Britto's user avatar
4 votes
2 answers
222 views

How to secure the screw on a BLDC motor shaft

I lost the screw that holds the motor bell to the base of the motor. I replaced it and flew, but it came loose and I lost it again. I used blue thread lock to secure it. Do I need to use red thread ...
Schome1's user avatar
  • 1,226
4 votes
1 answer
1k views

Why do most multirotors use outrunner brushless motors?

I've noticed that most every quadcopter drone I see uses outrunner BLDC motors like this: Why is that? What unique advantages to outrunners have that make them better than inrunners for multirotors?
ifconfig's user avatar
  • 6,008
4 votes
2 answers
569 views

How to straighten a motor shaft?

I have a drone with a motor shaft that got slightly bent. I can't buy a replacement bell because they only sell the motor as a whole. Is there any way to bend the motor shaft back into position?
Jacob B's user avatar
  • 5,792
4 votes
1 answer
460 views

How tight should the screws at the bottom of the motor shaft be?

As I was replacing a shaft screw on a motor, I thought I'd check the other motor shaft screws. I noticed that none of them were tight, so I tightened them. As a result, the drone flew horribly. So ...
Schome1's user avatar
  • 1,226
4 votes
4 answers
2k views

How should one chose the correct motor KV for a build?

For a 5 inch, 4S build, the general advice is to go 2300-2750KV. For the same size but 6S, it should be ~1800KV. However the same motors could be used on a 4S 7 inch quad. And all of this scaling ...
Drones and Whatnot's user avatar
4 votes
2 answers
138 views

Lift off without receiver

Can I make a small drone frame achieve lift using 4 coreless 3.7 v motors of 55000 rpm, 3.7 v lipo batteries having 40c without a receiver and remote. Motors are all alike. The propellers I have are ...
Raster R's user avatar
  • 381
4 votes
1 answer
158 views

Choosing ESCs for an Autonomous Drone

I'm about to build my first drone. I chose the PixHawk 4 with PX4 as a flight controller and the Raspberry Pi Model 3B as the companion computer. I am not sure about the ESCs yet. So far I'm ...
H123321's user avatar
  • 81
4 votes
1 answer
173 views

Brushless Motor/ESC Voltage Cut-off

I got an ESC and brushless motor set for my RC car. After I finally got it to work, I put my car back together, but then when I turn on the transmitter and then the ESC, the motor emits a "beep&...
Jacob Hornbeck's user avatar
4 votes
2 answers
390 views

Brushless Motor not spinning when controlling with Raspberry Pi, PWM and ESC

I'm currently working on a drone which is controlled by a Raspberry Pi. I try to control the motors by using PWM on the connected ESCs, which is described in many guides and forums. For that I use the ...
HexadiemsnionalerAlp's user avatar
3 votes
2 answers
1k views

Does the performance of a brushless motor decrease over time?

The brushes wear out in brushed motors and their performance decreases until they stop working, but brushless motors have fewer parts in contact and thus don't wear out nearly as fast. Does the ...
Jacob B's user avatar
  • 5,792
3 votes
2 answers
2k views

What are the specs of the DJI Mavic 2 Pro motors?

Does anyone know the specifications of the motors on the DJI Mavic 2 Pro? I'm asking about things like stator size, KV, etc.
Jacob B's user avatar
  • 5,792
3 votes
1 answer
2k views

How to measure the RPM of a drone motor using Betaflight?

I am interested in finding out the RPM of the motors on my drone with certain amounts of load and without load. Is there some way to measure the RPM of a drone motor using BetaFlight? If not, is there ...
Jacob B's user avatar
  • 5,792
3 votes
1 answer
549 views

Can a BLDC motor meant for a multi-rotor be used for a fixed-wing aircraft?

I am designing a propulsion system for a fixed wing aircraft (RC plane). I have found a motor that meets all the requirements of my fixed wing aircraft. But the motor was for a multi rotor. Can we use ...
Anshuman Phadke's user avatar
3 votes
1 answer
630 views

Are there any brushed outrunner motors?

The most common motors on drones are brushless outrunner motors. I´ve also seen some brushless inrunner motors. Are there any brushed outrunner motors? If so, why are they so uncommon?
user avatar
3 votes
1 answer
439 views

All motors vibrating but not spinning?

I made a 3D-printed drone body and attached some MT2204-2300kv brushless motors. I have the standard yellow 30A ESC for each of the 4 motors. I also have an Arduino Uno running YMFC-AL and a FlySky FS-...
DragonflyRobotics's user avatar
3 votes
2 answers
432 views

On a multirotor, how effective is braiding of power wires from the ESC to the BLDC Motor(s) in reducing or eliminate emf?

Assuming BLDC motors with the ESC positioned at the 'worst case' (furthest distance) with longest power wires between the ESC and the motor, will braiding these three wires reduce the EMF that would ...
HansenJC001's user avatar
3 votes
1 answer
64 views

Vibrating like a jelly when takeoff

I have Kotleta 20 UAVCAN ESCs. When I trying to increase throttle, motors are vibrating like a jelly. How can I configure my ESCs via development port? What are best options for non vibrated flight? ...
Furkan Mola's user avatar
3 votes
0 answers
82 views

BLDC Motors not spinning at commanded RPM

I have a F450 Quadcopter frame with BLDC motors of 1000Kv and ESC (simonk) 30A each. I am trying to verify if the bldc motor rpm output at a commanded rpm is same as commanded rpm. I am using ...
TheLazy's user avatar
  • 451
2 votes
4 answers
593 views

Effect of motor load on ESC?

I know that when a prop is caught on something or is slowed down by something it can put extra strain on the ESC or even burn it out. If I was using a 2207 motor with an unusually large and heavy ...
Jacob B's user avatar
  • 5,792
2 votes
4 answers
745 views

When to replace bearings in a brushless motors?

When, if ever, should I replace the bearings in my drone's brushless motors? Are there signs that a motor needs new bearings?
Jacob B's user avatar
  • 5,792
2 votes
2 answers
822 views

What props for a 2207 2750KV motor?

I have a 4s Nazgul5 drone. It is a 5'' drone and uses 2207 2750kv brushless motors. What is the most aggressive prop I can use on the drone without causing it to overheat or cause the battery to sag?
Jacob B's user avatar
  • 5,792
2 votes
1 answer
77 views

Drone falling on one side while taking off

i made a quadcopter using arduino and am quite new to it. when i 1st flew it it fell on one of the sides i used: 1800kv golden bldc motor 30 amp esc 1045 propellers arduino uno and mpu 6050 fsi6 ...
Rathore Brothers's user avatar