Questions tagged [brushless-motors]

Use for questions regarding brushless DC motors.

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3
votes
1answer
33 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? ...
4
votes
1answer
41 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 ...
4
votes
2answers
42 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 ...
8
votes
1answer
629 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 ...
8
votes
1answer
78 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 ...
2
votes
1answer
40 views

Recommendations for a BLDC motor and battery for a 28x20 propeller?

I'm looking for a motor and battery set up that can last for over an hour and spin the propeller at 6000+ rpm. The propeller is a 28x20 single blade being connected to a second blade for a total of 56 ...
11
votes
1answer
246 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?
7
votes
1answer
91 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 ...
7
votes
1answer
105 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: ...
5
votes
2answers
44 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 ...
5
votes
1answer
47 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 ...
7
votes
1answer
311 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 ...
2
votes
1answer
84 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 ...
1
vote
0answers
96 views

What motors, battery and ESC to use for a drone of payload >50kg?

So I am designing this octocopter which can lift up a payload of more than 50kg, min 50kg for an intra-city package delivery drone. From what I figured, with 8 motors, the safest thrust needed will be ...
3
votes
2answers
65 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 ...
4
votes
4answers
290 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 ...
4
votes
3answers
94 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 ...
6
votes
3answers
150 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-...
5
votes
2answers
170 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. ...
4
votes
1answer
112 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?
3
votes
1answer
57 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?
5
votes
1answer
40 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?
3
votes
2answers
64 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 ...
0
votes
1answer
57 views

Why do brushless drone motors tend to be more expensive than brushed?

The most common motors used for modern drones are brushless outrunner motors and I have heard that they are simpler to manufacture and are less susceptible to issues when being mass-produced than ...
2
votes
4answers
79 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?
3
votes
2answers
69 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.
-1
votes
1answer
35 views

Difference between iFlight XING-E and XING motors?

Is there any performance difference between iFlight's XING-E and XING lines of motors? I know that the XING motors have some better materials like titanium shafts but are there any performance ...
4
votes
2answers
58 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?
2
votes
2answers
95 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?
15
votes
6answers
163 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 ...
4
votes
3answers
94 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?
2
votes
4answers
80 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 ...
8
votes
3answers
118 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?
11
votes
3answers
152 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 ...
8
votes
2answers
182 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 ...
9
votes
3answers
154 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?
11
votes
2answers
189 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?