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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Selecting MOSFETs for Motor

I want to implement a driver circuit for a (sensored) motor that I am purchasing which has the characteristics (on the shopping website): Max Amps: 16 Max Power: 350W ESC: 35A KV: 1900 The ...
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24 views

Encoder sampling rate realization

I know that questions from a mechanical engineer might sound a little naive to you :), but here I go: I am trying to use an Arduino Uno as the brain for a DC brushless motor that we have for a ...
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2answers
186 views

Connecting 4 ESCs in parallel

Background: I'm building a quadrocopter. In such RC models, usually brushless engines are being used and these require ESCs (Electronic Speed Controllers) to work properly. Most ESCs are equipped with ...
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2answers
87 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 ...
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70 views

BLDC zero-cross issue

I am trying to develop a BLDC motor ESC (electronic speed control) for motors in water. This means that the motors will be subject to more load (due to the water). I am going for the sensor less ...
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46 views

Wiring of ESC to Motor just plays tune

I have this ESC. I am not sure if I have the leads connected correctly, but when I power the esc and send it signals it doesn't move. I am writing to it as a servo via an arduino. What it does do ...
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122 views

Controlling a brushless DC motor with an Arduino--*without ESC*

I want to build an ESC using an ATmega328 (used in Arduino Uno). This is the Brushless DC Motor I've chosen and this is the MOSFET I've chosen to gate the power supply. It will be used to drive a ...
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1answer
113 views

Building my own brushless 3-phase motor driver to use with an Arduino

For educational purposes I want to build from scratch a PCB that would allow me to control an hard disk motor I scavenged from the trash. To do so, I was thinking about using AO3400 and AO3401 (PNP ...
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46 views

how to select Dc Motor

I have air conditioning application where i want to run blower @ 1500 rpm. Motor is rated for 48-56v DC. The operation of motor is continuous mode. Let me know calculation involved here Minimum ...
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3answers
108 views

Power 4.5V Lego motor by 5V PSU, how?

It's a long story. Please bear with me as I try to describe what I intend to accomplish. I've got a Raspberry-PI controlled Lego Technics (pre-Mindstorms era stuff) construction. It uses a couple of ...
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1answer
148 views

BLDC BEMF not right

I am trying to build my own ESC (brushless DC controller) and I managed to get the motor running starting from a ramp to a steady PWM duty Cycle and Commutation period and these are the BEMF waveforms ...
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103 views

BLDC speed and torque control

I have a question understanding the exact commutation of the sensorless BLDC motors. My motor has 7 pole pairs. Now assuming the 3 phases are - U,V and W ( so that's U+,U-,V+,V-,W+ and W- from the ...
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112 views

BLDC motor thrust

I am trying to drive BLDC via a custom ESC. I have read that we can control the motor in 2 ways - current control and voltage control. I am using PWM to get them working. Now, I understand that we ...
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68 views

Motor startup voltage

I am trying to drive a BLDC motor using MOSFET bridge network with sensorless BEMF detection scheme. In the BEMF it looks for Vcc/2 (half of max Vcc). Now, in each state the top/high MOSFET is PWMing ...
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1answer
327 views

Calculating Back EMF from Torque Constant

I have a brushless DC motor with a torque constant of .0181 Nm/A. How do I calculate back emf (Vpeak/kRPM) from torque constant (Nm/A)?
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1answer
68 views

DC 5 Volts - 2100mAh Electric Motor Generator. How?

I have spent my entire weekend trying to locate a place where I can buy a 5 Volts - 2100mAh Electric Motor/Generator. My goal is to spin this motor up to a certain RPM to generate the 5 volts and ...
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2answers
512 views

Wind turbine generator: brushed or brushless DC motor?

I am trying to use a DC motor as a generator for a wind turbine but then there are two possibilities for the DC motor which are brushed and brushless. Which one is more efficient to use? I know that ...
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0answers
41 views

How to understand voltage change between different phases of BLDC?

Actually, it is a question about an application note of BLDC from here. (on page 30 of that material) The question is about calculation of potential of M. What I learned from book is that the ...
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1answer
171 views

Blind Driving a Brushless DC Motor BLDC

I'm looking at making a BLDC controller with an MCU, and have be reading through the atmel guide AVR444 which steps through a design and software needed for a sensorless back-emf timing controlled ...
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73 views

BLDC working driver

I am trying to drive a BLDC motor. I was driving 2 phases and keeping the 3rd phase floating so as to measure the BEMF in it. But, what I find is whatever voltage is applied on the +ve or high side ...
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55 views

How do I match a brushless motor to an ESC?

I have purchased an iPower GBM5208H-180T brushless DC motor. Configuration: 12N14P Resistance: 10.2 ohms I need to run the motor at ~1800 RPM. Here's iPower's list of ESCs. Most are rated ...
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2answers
113 views

BLDC Motor Commutation Based Speed Control

I am working on a project which has a motor to drive a gyroscope (it has quite a bit of mass, and we want it to run at 60k RPM or more). The motor we built has very low inductance. We started using ...
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1answer
113 views

Motor/driver for smoothest and most constant speed

Which type of motor/controller can maintain the smoothest and most constant speed in the range 300 - 1000 rpm with minimal vibration? ie: low cogging torque, etc. I have an application in mind which ...
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2answers
153 views

DC Brushless Motor For Electric Rover

I'm an industrial designer, and am working on building a small electronic rover, however I've been doing some research and I feel a little bit lost in terms of what motor is best for me, The device ...
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1answer
97 views

Will this ESC work with these motors?

I am looking in to making a UAV quadcopter and I don't know how to calculate what ESC to use with the motors I have picked. I am looking at buying the HobbyKing Red Brick 10A ESC and the Turnigy ...
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1answer
290 views

HDD Brushless Motor runs jerky!

I have been trying to make a tricopter on a budget.The first line of thought is to use a brushless motor from a HDD. I got one. I also have a 12A ESC, from a airplane, whcih has been lying around, a ...
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1answer
247 views

BLDC speed and position from back-emf

I'm trying to make my own sensorless speed controller and I need to know the speed and the position. What are the basic techniques used to determine the speed and position of a BLDC motor from the ...
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274 views

Magnetic field strength and bldc rotor

As a background to this project, I have taken an off the shelf bldc stator and incorporated it into a small pump, and then built my own rotor using discrete neodymium magnets. At first, everything ...
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205 views

Analogue Hall sensored brushless outrunner motor position control

I would like to produce a low cost high power:weight servo drive using a brushless outrunner motor, like those use in radio control planes: Some of these motors leak enough magnetic flux out the ...
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228 views

What is this part? PN:R19F 2E

Mystery Encoder I think this is some sort of rotary encoder, but it doesn't seem to act like one (no quadrature output from the pins). Tests I've run: 5V input in each pin, monitoring the other ...
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3k views

Difference between Brushless Motor and Stepper Motor

I think I understand the operating principles of a brushless motor and a stepper motor, but I'm a little confused about the difference. Is a brushless DC motor a very basic stepper motor? With ...
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1answer
463 views

Brushless DC Motor - Sensoreless Startup Algorithm

I am trying to achieve speed control of a sensorless Brushless dc motor (Back Emf method). Initially its speed is zero so Back emf is zero, so there will be no feedback, in that case what do i do? ...
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424 views

Reverse-engineering a brushless ESC, could someone help me understand the circuit

So I'm in the process of trying to reverse-engineer a hobby brushless ESC. Above is the schematic for a single half-bridge drive circuit. VIN is 11.1V D1 is an unidentified diode; all that I've ...
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181 views

BLDC stator sourcing

I have been given the task to redesign a small water pump(1.25 gpm) that uses an off the shelf hobby motor(740kv brushless outrunner 14 pole http://www.hobbypartz.com/86ma64-2215-740kv.html ) that ...
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64 views

PI loop design for 2nd order system

I have a plant system which is 2-pole and 0-zeroes for which i want to control two different parameters. So, I'm trying to design two PI loops in feedback one for each parameter which will make ...
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1answer
520 views

bldc motor torque controller

I have a working custom motor controller for three phase sensorless bldc motors. I've implemented open loop speed control, where the duty cycle is changed to change speed. I've also implemented a ...
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2answers
455 views

Use Micro-Controller Instead of ESC

I was wondering if I could use something like microcontroller instead of an ESC. I tried finding tutorials on Google and YouTube and I couldn't find anything useful. Could you please help me? P.S. I ...
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1answer
286 views

High Side and Low Side MOSFET Driver… with low supply voltage

I need to drive a pair of N channel MOSFETs, one on the high side of the load and one on the low side of a load. Most ICs I can find for this application require 10V+ supply voltage to get the the ...
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1answer
507 views

choosing the suitable DC motors

I'm working on a 4x4 robot that is supposed to carry stuff total_mass=100kg (including the robot). the robot should have average speed ...
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1answer
291 views

24v brushless DC Driver Pinout

I have some Brushless DC Motors with drivers and I need some help finding the pinout of the drivers. Please take a moment to view the pictures here, clicking on a picture will show its ...
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2answers
1k views

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
655 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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3answers
796 views

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 ...
3
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1answer
816 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
445 views

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
626 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 ...
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1answer
510 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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369 views

How to drive dualsky ESC with arduino PWM? (Brushless motor)

I've recently received 4 Brushless motors, 4 brushless ESC's and 2 LiPo batteries. I managed to run the motors with my arduino and the servo library, but I'm not getting optimal results. I was ...
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352 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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746 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 ...