Questions tagged [brushless-motor]

Brushless motor is kind of DC motor. It is also called BLDC Motors (Brush-Less Direct Current Motors).

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19
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3answers
21k views

Why do quadcopters use brushless motors?

I've been thinking about starting a quadcopter project, maybe building it from scratch. One of the main barriers-to-entry for me is the motors: it seems like most quadcopters use brushless motors. I ...
13
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2answers
802 views

Should I switch my servo system from brushed to brushless motors?

I have a robot that uses brushed motors in its servo system. These are Maxon 3W motors, with 131:1 planetary gearboxes. The motors are controlled by a PIC microcontroller, running a 1kHz PID ...
12
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2answers
19k views

What do the commutation waveforms look like for a brushless motor?

I have seen waveforms for driving a brushless motor. I guess this is the waveform used for the simpler block commutation. But if I want to do sinusoidal waveforms, what does the PWM signal look like ...
8
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1answer
293 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 ...
6
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4answers
13k views

What is the difference between RC motors for cars and helicopters?

I am working on a robot with focus on speed. At the moment I am looking for a suitable motor but it world help if I understood the difference between the various options. To provide some background, ...
6
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2answers
536 views

Explanation of Quadcopter Dynamics, Components and Control

I am about to build my own quadcopter from scratch. However i am having problem with understanding how it is possible to control the quadcopter without knowing the current rpm of the BLDC motors. ...
6
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1answer
239 views

Field oriented control of brushless motors

If I was controlling a normal brushed motor as a servo, I would measure the motor's position, and adjust the PWM signal to control the voltage. This way I could achieve a precise velocity/position ...
6
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2answers
57 views

Brush-less motor specs vs efficiency for multi-copters

I am looking for some figures surrounding the specs of brushless motors and their relative efficiency (in power usage terms) for multi-copter use. There are 4 basic specs for motors themselves: - ...
5
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2answers
2k views

Does it matter if my electronic speed controllers are close to my brushless motors?

I have built several quadcopters, hexacopters, and octacopters. Between the flight controller (I use 3DR APM2.6 or Pixhawk) and the motors I use heavy duty power wires as well as a servo-style cable ...
5
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3answers
1k views

Can I reuse the hall sensors in a brushless motor as an encoder?

I have upgraded the motors in my robotic arm to sensored, brushless RC car motors. The hope was to reuse the Hall sensors to double as a rotary encoder, by tapping 2 Hall sensors and treating the 2 ...
5
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1answer
197 views

Quadcopter Propeller size + Motor

i would like to build quad that uses bigger propellers like 15" . My question is what kind of motor shall i use ? Low or high KV? Do all motors support this kind of propellers ? Will they burn because ...
4
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2answers
3k views

For robot wheel control : Brushless DC motor or Servo Motor?

Simply, when to use brushless dc motor and when to use Servo Motor ? what are the differences , specially when adding an encoder to the dc motor you can have the position and it will be similar to ...
4
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1answer
4k views

Low speed control of bldc motors

I'm having a problem with controlling my BLDC motor when starting up and when running in low rpm. I have a custom board to measure rotation of the motor using an optical sensor and send servo pwm ...
4
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1answer
794 views

Connecting a 6 pole motor to a motor driver?

We are trying to power this motor with this motor driver , using a 11.1V 2.2Ah lithium-ion polymer battery. (We're in over our heads with this and really need the help) We checked with the company (...
3
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2answers
4k views

Using brushless motors for very high torque

I'm currently building an robotic arm and I want the elbow joint to be comparable to a human one But here's the problem, electric linear actuators are too slow and have low torque, same goes with ...
3
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2answers
408 views

What are some ways to estimate torque/load on a robotic arm joint

My main problem is measuring joint torque/load economically. There are ways to detect the electric current drawn which is proportional to the torque. Since my motor is a BLDC motor, there will be a ...
3
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2answers
4k views

Zero crossing events with brushless DC motors

I would like to ask a question about zero crossing event in a trapezoidal commutation on a brush-less DC motor. Here is a waveform that shows that the zero crossing event occurs every 180 electrical ...
3
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2answers
1k views

Will a 20amp ESC run a Turnigy 2213-980?

I'm a noobie just starting out and trying to come up what I need to build my first quadrocopter, I just wanted to run something by people with some experience before I commit to buying anything. ...
3
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2answers
10k 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 ...
3
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1answer
675 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 ...
3
votes
1answer
50 views

Do mobile robots use variable transmissions?

I've built a simple robot that can move. I'm using brushless motors. I've realized that at slow speeds the motors pull a lot of current. I didn't understand the power / current / efficiency charts ...
3
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2answers
1k views

Electronic Speed Control Concepts

I am a programmer who has never worked with electronics before. I am learning the concepts and hoping to build a quadcopter, with the control software entirely written by me. Motor control seems to be ...
3
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2answers
2k views

How to assemble brushless motors and propellers?

I'm building a quadcopter and I've received my motors and propellers. What's the right way to assemble those together? I'm not confident with what I've done, as I'm not sure the propeller would stay ...
3
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2answers
951 views

Driving sensorless three phase BLDC motor with Arduino and IMU

I have started to work on a little project of mines, which consists in implementing the stabilization a single axis gimbal using Arduino. The gimbal is driven by a sensorless three phase brushless DC ...
3
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1answer
192 views

Controlling an ESC for Brushless Motors with an RPi

I'm looking to build a new (first) quadcopter without the conventional flight controller and radio, with an onboard RPi and applying some newfound knowledge on autonomous control to improve my coding ...
3
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2answers
11k views

Choosing DC motor: max needed torque vs nominal torque

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
3
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1answer
5k views

How to know what motor/ESC/propeller combination will work for a quadcopter?

I am preparing for my first quadcopter build and need to know how to tell what motors/ESC's/propellers will work with each other. I also would like to know how to tell what the motors would be capable ...
2
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2answers
3k views

What happens when a brush-less motor stalls?

Ok apologies for those who think my questions are not direct enough as I got warned about this. I am really new to this and I will try to keep this one direct enough for the forum. For obvious ...
2
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3answers
825 views

Is a larger Kv equivalent to more voltage?

I've been a fan of first person view drone Racing for years now and, in thinking of building a new quadcopter, I have a question I'm unable to resolve myself. Please correct me if I'm wrong: As i ...
2
votes
1answer
372 views

What is the typical weight distribution for a brushless motor?

Brushless motors, like regular motors, have different parts (commutator, stater, etc). What do these various parts weigh?
2
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4answers
3k views

Why does the ESC stop?

I've built a quadcopter with four brushless motors and ESCs (30A). I'm using an Arduino to control them. I haven't written any complex code; just enough to get them running. Everything is fine until I ...
2
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1answer
2k views

How do I if know my quad is powerful enough to take off vertically smoothly and how do I calculate max Thrust(g) for given current(A) and voltage(V)?

If I build my quadcopter with the following components, will it take off vertically smoothly? Frame: F450 glass fiber and polyamide nylon [280g] Landing Gear: High Landing Gear for F450 [90g] ...
2
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2answers
407 views

Nano sized electric motors

What is a good website for buying 1.5V continuous motors? I'm looking to build a clockwork robot but I cannot find a motor small enough to fit inside my power box and I don't want to mount it outside ...
2
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3answers
597 views

Sun tracking with +/- 0.1degree accuracy?

For a school project I am looking to track the sun with +/- 0.1 degree accuracy for use with a parabolic dish reflector. Say we need a final output torque of about 20Nm, what kind of gearing/motors ...
2
votes
1answer
229 views

What BLDC servo drive takes sinusoidal hall sensor signals?

I am looking for a servo drive to control a brushless DC motor, with at least 10A, 30V rating. However, I want to know if any exist which take sinusoidal hall sensor signals directly. I already know ...
2
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2answers
69 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 ...
2
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2answers
357 views

Selecting a gear reduction: torque vs speed

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
2
votes
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=...
2
votes
1answer
734 views

EMAX ESC Simon Series with arduino

I want to control a brushless motor with the "EMAX Simon Series 30amp ESC" and Arduino (Leonardo) board. I am really confused how to do that. I can't understand which beep sounds mean what. I have ...
2
votes
1answer
1k views

Is the nominal voltage of a motor the voltage to apply to the motor?

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
2
votes
3answers
2k views

Pre-built PID motor controller [closed]

I lead a university robotics team that needs PID controllers for four drive motors and two additional motors that are used in a secondary system. I would strongly prefer to buy pre-built PID ...
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2answers
5k views

Can i use DC Brushed motors for building a drone? [closed]

I want to make a drone. But my budget is very low. Brushless motors are very expensive. I want use the Brushed CHEAP ones. can i us them ?
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2answers
768 views

Voltage rpm relation

I measure the voltage ESC drawing while increasing the dc motor speed. Multimeter shows that as long as the speed increases the voltage value decreases. Can anybody explain why this is happening?
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2answers
70 views

Why are brushless servos more common than steppers in Cobots?

Essentially every cobot I've worked with uses BLDCs instead of stepper motors in the joints. When searching for answers as to why I see a lot of posts that suggest one or the other, but nothing ...
1
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1answer
2k views

trapezoidal vs sinusoidal commutation

How do you know if a commercial driver is working with trapezoidal or sinusoidal commutation? If you measure the 3-phase voltage applied to the PMSM by means of an oscilloscope, will you see a ...
1
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1answer
23 views

How should i select motor and blades for my Hexacopter?

I'm designing a fluid sprayer Drone (HEXACOPTER) for Agriculture as my college final year project. The capacity of the fluid spraying unit including fluid & Sprayer around 2kg. I don't know how to ...
1
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1answer
235 views

DJI E310 Thrust Coefficient

I am reading Denis M. Filatov et al.'s paper "Parameters identification of thrust generation subsystem for small unmanned aerial vehicles" (https://www.semanticscholar.org/paper/Parameters-...
1
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1answer
634 views

brushless motor as a servo

I would like to use(or control) a gimbal brushless motor like a servo meaning I want to control position not rotation speed. The position must be from 0 to 180 and 0 to -180 I will use an Arduino ...
1
vote
1answer
381 views

Brushless DC motor problems at high velocities

For a project we use a brushless DC (BLDC) motor. Everything works fine until we tried to reach high velocities. I will first explain my setup, and than explain our problems using some graphs. 1.0 ...
1
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1answer
7k views

How to find Friction or Viscous force b (nmsec) in DC motor

PLease guide me How to find Friction or Viscous force b (nmsec) in DC motor for a particlar speed. The motor is connected with a gear and the ration is 26:1 I want to find for 200 rpm and the motor ...