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Questions tagged [brushless-dc-motor]

A brushless DC electric motor is a DC motor type that uses an electronic inverter/switching circuit to energize the motor coils in a sequence (based on the detected rotor position) in order to rotate the motor.

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What is the use of PWM over brushless control

I just saw this question How do I eliminate PWM noise when driving a fan? but cannot think of the reason why is doing PWM over brush-less control useful. I am assuming people are trying to control ...
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2answers
4k views

What do the green and yellow wires in a BLDC fan do?

I rescued a box of brand new 'Nidec UltraFlo V60E12BS1A7-09A032 12VDC 2.45A' fans from being thrown away and of course I haven't got the datasheet for them. The closest matching datasheet is here: ...
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4answers
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Why Have Non-Zero Timing on a BLDC?

I've heard you can go faster in one direction if you adjust the timing, but do not understand why? I have a sensored bldc motor with a 30deg shift of the hall-effect sensors, tried going forward (CCW ...
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1answer
3k views

How to Find Time Constant of a BLDC Motor?

I've done this with DC motors by determining the inductance and then computing tao = L/R where L is the inductance of the coil and R is the resistance of the coil. Is there a best-practice way to ...
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3answers
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How to choose a PIC for a BLDC Motor Controller?

I just made a BLDC motor controller, but I'd like it to be able to go to higher frequencies (have less dead time, faster firmware, etc). In particular, I'm aiming for 20kHz-to-50kHz range, but am ...
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1answer
2k views

Why does BLDC Motor Spin Slower with Same Duty Cycle at Higher Frequencies?

I have an OTS BLDC motor controller as well as one that I just made myself and both seem to be dramatically slower at higher frequencies. When I look at how much current is being drawn it makes sense,...
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1answer
2k views

BLDC Motor Driver Losses

That was a pdf when originally uploaded, but am now going to try to zoom in on the sub-circuits. Please let me know if there's a better way to do this. I'm trying to make a PIC-based BLDC motor ...
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1answer
1k views

BLDC motor how to identify

How to identify whether given motor is permanent magnet AC ie sinusoidal back emf or permanent magnet trapezoidal back emf motor. I am confused as motor I am having seems sinusoidal back emf and ...
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1answer
4k views

Test ESC using a Servo Tester

I'm trying to test my 20A Hobbywing skywalker ESC. For that I bought this servo tester from ebay I'm a bit confused about the servo tester input. Shouldn't it be just supply power? Then what is that ...
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1answer
243 views

1S Lipo Powered BLDC Motor Control?

I have a 1S Lipo battery, and would like to drive a micro brushless motor at upwards of 6 Amps. I'm trying to design the h-bridges using 2 N channel mosfets each, but ran into the issue of finding a ...
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3answers
32k views

Control differences between ac induction motor and brushless dc motor?

I have a fairly solid background in industrial AC motor control (soft starters, VFDs, etc.) but something that I'm certainly NOT well versed in is brushless DC motors... the type found in every hard ...
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1answer
4k views

How to use an ESC

I'm new to RC related modules. Today I got my Hobbywing's Skywalker 20A brushless esc. Manual is here. I also have a brushless outrunner motor (HL3512) I don't ...
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8answers
235k views

How are current and voltage related to torque and speed of a brushless motor?

I know that electric vehicles have different performances depending on battery and motor, but it's not clear how electrical and mechanical units are related. Can anybody please help? Will a 100V ...
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3answers
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What is this type of motor called?

Firstly some background: I would like to make a magnetic stirrer, like the ones they use in chemistry labs: A small bar magnet sits inside the glass jar, while another bar magnet, attached to a ...
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1answer
589 views

Inductance of a HDD BLDC Motor Phase

So I have set up a little experiment which involves a HDD BLDC Motor, a scope and a multimeter. Pretty simple, I know. Is it possible to determine the inductance of a phase by the voltage the phase ...
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1answer
1k views

Brushless motor controlled via current source math model

I'd like to model a brushless motor's (BLDC) dynamic response using Matlab. I'm controlling the motor by an Elesctonic Speed Controller (ESC). I'd like to derive a transfer function of such a circuit ...
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2answers
6k views

Controlling small brushless dc motors?

I'm designing an ESC with a small microcontroller running at 3.3V. The BLDC motors I have chosen are extremely small, and run best at 3.7V. I have the power supply for both of these (3.7V is VBATT, 3....
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1answer
5k views

How to choose an Electronic Speed controller?

I'm having a go at making my self a quad-copter and was wondering how one would go about choosing an ESC?. I've chosen this motor and this ESC, Is the ESC suitable for that motor?
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4answers
63k views

Understanding motor constants Kt and Kemf for comparing brushless DC motors

So for a practical definition, the torque constant Kt specifies how many Nm of torque you'll get from the motor at a certain current? Is a bigger Kt always better? I am more confused about the ...
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1answer
2k views

BLDC Regenrative ESC and LiPo [closed]

I am currently working on a project where I want to implement a Brushless dc motor (like the Turnigy C2226 - 1800kv) to run in-hub of an RC car. I need this entire project to be as lightweight as ...
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1answer
3k views

How to identify a BLDC motor from a brushed DC motor?

I got 2 dc motors from a broken cheap RC helicopter. How can I Identify what type of motor it is? It has 3 terminals, but only 2 where used. It takes around 2-3 Amps of current at 3.5 V. Each trace in ...
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3answers
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What determines the speed of a brushless DC motor

When driving a brushless DC motor, which parameters control the speed. Is it the current in the windings, the voltage, or both? What determines the maximum speed? If you drive the windings with PWM,...
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1answer
210 views

Debugging Vds exceeded in motor drive application

I have an existing motor drive circuit that uses an Allegro 4935 to drive a brushless DC motor. The circuit has been working fine. We've decided to change motors, now with some of the motors the ...
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1answer
614 views

Brushless DC motor sometimes running backwards

I'm working on a motor control system I've inherited. It's custom designed but I have access to all the schematics and source code. The way the code is written the motor controller responds to ...
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5answers
5k views

Brushless DC motor runs fine in one direction but not another

We have changed BLDC motor suppliers and are seeing a new problem. In the old system the software commanded the motor to move 5 steps of X hall counts then stop. With exactly the same electronics ...
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4answers
7k views

Brushless motor specs to maximize stall torque

I'm interested in a brushless motor having a high stall torque (not much in RPM). What specifications of a BL motor would give a fair indication of its stall torque, provided that voltage is fixed ( ...
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1answer
2k views

how to control brushless dc servo motor?

I have one of this motor and would like to make a controller for it ( just a speed controller with regulator that change speed from zero to maximum. ). I know micro controller and embedded system, but ...
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2answers
6k views

Cannibalizing a printer, how to figure out what some of the parts are/do

My son an I are attempting to cannibalize a printer a HP LaserJet 1300. It used to work and print, but it was low on toner and the company we got it from replaced it instead of buying new toner. So, ...
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1answer
555 views

Need help understanding and interpreting IGBT datasheets

When it comes to motor control, I understand that we have the option of using discrete MOSFETs or IGBTs. Also, there are some products in the market where 6 IGBTs are placed in one single package, ...
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2answers
8k views

Which voltage uses the “Kv” parameter in a BLDC (Brushless DC) motor?

According to the definition of a BLDC by Wikipedia: \$K_V\$ is the motor velocity constant, measured in RPM per Volt (not to be confused with "kV," the abbreviation for "kilovolt")[6]. The \$K_V\$...
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4answers
2k views

Why do we need brushed motors?

Looks like brushless motors are more convenient - no brushes means no maintenance required. For example, power tools manufacturers often cite that graphite brushes need to be replaced every 50 hours ...
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1answer
3k views

Stopping a brushless DC motor in a specific position

I have a BLDC motor on an autopiloted model airplane, running with an ordinary PWM-controlled ESC. I have a feature I'd like to add which the ESC I have doesn't support, so I either want to find one ...
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2answers
1k views

predicting brushless motor rotation direction?

When connecting a brushless motor to an ESC, we are taught to apply power and switch two of the wires if the blade is spinning in the wrong direction. Is it possible to predict the blade rotation by ...
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2answers
11k views

Controlling a Brushless ESC with Arduino

I read this is possible here: How to drive brushless motor with Arduino? I'm just getting started with Arduino and electronics in general, can anyone recommend a tutorial or guide that could serve ...
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4answers
11k views

Can you run a BLDC motor backwards without damage?

Can you run a BLDC motor backwards without damage? Is it OK to drive a model airplane BLDC engine backwards while landing, so it gets a little "reverse thrust" and come to a stop a little quicker on ...
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1answer
2k views

Controlling/Reading Hard Drive Brushless Motor w/ uC

I am working on creating a Hard Drive DJ similar to the other posting on this website, except that I want to drive the motor when the user isn't scratching on it. Multiple sources recommended using an ...
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6answers
63k views

How to drive brushless motor with Arduino?

Is it possible to drive a brushless motor directly with Arduino? Or should I revert on controlling a brushless motor ESC with PWM pulses?
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2answers
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How do you read newer HDD motors (DC/Brushless) into arduino? (like stepper motors)

We had a version of the HDDJ working with an arduino reading an old stepper motor (with 4 wires), then sending serial data to processing, using a midi library, and midiox + midiyoke. Having trouble ...