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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24 views

Building BLDC ESC - question on PWM duty-cycle vs motor speed

I'm currently working on a simple ESC design to drive a small BLDC motor (6A continuous max). I'm at a stage where I can start the motor reliably, but haven't yet achieved closed-loop control using ...
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28 views

arduino brushless motor angular speed

I am using brushless DC motors for my project. I am controlling the motors via arduino through ESCs. I wanted to retrieve the rad/s speed of each motor. I use the arduino's Servo.h library to send ...
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32 views

Request for separately excited DC motor specification

Can anyone provide actual separately excited DC motor specifications(resistance,inductance,friction coefficent,inertia,value of constants etc..(need it for simulation purpose)?
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53 views

Determining switching frequency and selecting Bootstrap Components for MOSFETs

For a university project I need to control a brushless DC motor with the following specifications RPM: 670kV Max Current: 40A No Load Current: 10V/3.9A Internal Resistance: 0.04 ohm Recommended ...
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2answers
47 views

Using an L298 to drive 2 unidirectional and 1 birectional motor simultaniously

First up I am not an EE and am fairly new to this, so please forgive my ignorance. I have a project that requires me to control 2 unidirectional and 1 bidirectional brushless DC motor at the same ...
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26 views

What should I use to program these ESCs?

I am working on a project involving brushless motors, and as such I will need a brushless Electronic Speed Controllers (ESCs). If I were to buy one of these two ESCs, what would I use to program ...
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50 views

How accurately can an ESC detect the number of RPMs?

I am working on a project involving brushless motors, so I got an ESC to power them. The problem, is that I need to accurately control the number of RPM. Can an ESC, like this one, control the number ...
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43 views

Can ESCs (for brushless motors) be quickly reversed?

I am building a set of reaction wheels, using old "IBM Deskstar" harddrives. I want to power the brushless harddrive spindle motor using an ESC, such as those for model airplanes. Since I'm building ...
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31 views

How to connect a large exisiting code (some simulator) to the AVR Studio Simulator?

Context I am working on a brushless DC motor controller project. And I would like to verify that the interrupt timings make sense in simulation before downloading my code to the board. Challenge ...
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2answers
71 views

bldc crashing after '0' cross detection

I'm designing a BLDC driver (sensorless) using the the KL04 microcontroller. I am implementing a zero cross detection for commutation of the states. The flow I am implementing is: duty cycly = 30%. ...
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2answers
144 views

Why do AC motors have various back EMF shapes?

I just saw in one of the threads that apparently, a permanent magnet synchronous motor and a brushless DC motor have different back EMF shapes. But why? I thought those two were exactly the same in ...
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79 views

DC motors, AC motors, and Kv

As I understand it, DC motors have Kv values because their speed is determined by the applied voltage. AC motors don't have Kv values because their speed is determined by the frequency of the AC ...
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49 views

Does the peak torque decrease at rated speed for BLDC motor?

Does the below BLDC motor have the same Peak Torque(short time) at the rated speed? Rated_Voltage: 24V Rated_Speed: 4000RPM Back_EMF_Constant: 3.7Vp/KRPM Peak_Current: 4.4A Peak_Torque: ...
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1answer
44 views

Question about Intermittent Torque Zone and Rated Voltage

In the below two diagrams, the Intermittent Torque Zones are different, figure 1 is triangle and figure 2 is rectangle. I don't know which one is correct, is there something related to motor's rated ...
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2answers
76 views

What factors can determine the constant coefficient when calculating torque?

In this servo motor's datasheet, both motor have the same torque of 0.32 Nm, have the same power of 100w, but have different rated currents and voltages. It seems that the "torque" relates to the ...
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79 views

Stepper motor to replace brushed DC motor to be used to start a gas engine?

I'm trying to decide if it would be possible to use a stepper motor to replace a current 12V DC brushed motor that is used to turn over a small (~149cc) gas engine for starting. The reason why is, I ...
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3answers
223 views

What does manufacturer call PMSM motor?

It is easy to find BLDC motor manufacturers on google, but it is difficult to find PMSM. Maybe there is a terminology issue here. There are many "Brushless Servo Motors" or "Synchronous Servo Motors" ...
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416 views

HDD Motor Spinning

I'm trying to run a hdd motor using the following link. http://theamateurprogrammer.blogspot.hk/2014/02/revitalizing-old-hard-drive-motors.html Instead of using Audrino I'm using PIC16F73.I tried to ...
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147 views

High Torque Brushless DC Motors in Small Package

I have a particular set of requirements that call for a relatively high stall torque for the space available (300 ozf-in for < 8cm length of motor). The motor would be operating at a relatively low ...
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3answers
183 views

controlling 3x BLDC motors

I'd like to control 3x L6234 IC's (3x BLDC motors) with the cheapest microcontroller/board/lauchpad but I'm a bit confused about the requirements needed for the microcontroller. As I understood each ...
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1answer
78 views

Am I misunderstanding the specs of this solar panel or electric motor?

I've been trying to figure this out, but the answers I've come up with thus far have been counter-intuitive. The solar panel's specs are as follows: ...
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1answer
142 views

How do I control a brushless DC motor without an ESC with Arduino

Is there a way to control brushless DC motor removed from a CD-ROM drive without using an ESC by using an Arduino.
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1answer
76 views

BLDC waveform abnormality

I am designing a DIY BLDC ESC. I am able to detect the '0' crossing correctly (for the BEMF approach). It locks onto the '0' crossing (1.jpg). Then it stays good for a couple of iterations (2.jpg). ...
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43 views

3-phase BLDC motor operation

I salvage motor from HDD, then I started googling around how to make it spin and found this video(there are good subtitles in English): https://www.youtube.com/watch?v=CMz2DYpos8w Here he just plug ...
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2answers
60 views

Contactless electrical connection

I will have a carriage sliding over a round metal shaft and the linear bearings will not necessarily be conductive. I want to calculate the position of the carriage by measuring the resistance from of ...
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1answer
41 views

Safely Driving a Brushless Motor

I am currently building a quad-copter out of an Arduino. I decided to make my own ESCs using MOSFETs, EMF sensors, and the Arduino. These are the motors that will be driven: ...
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68 views

Which kind of motor would be better for an electric solar car, geared or non-geared?

My friends and I are working on an electric solar car. We want to know which kind of motor we should use: Geared or non-geared? 1kWh is the maximum power limit for motor which we can use to drive our ...
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41 views

Is the servo motor made of BLDC motor?

For example, the panasonic A5 family servo motor: Rated output(w): 100w; Rated torque (N*m): 0.32; Size: 38mm*32mm I guess it is made of BLDC, because the typical 100w AC motor must be much larger. ...
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81 views

Suppressing BLDC Motor noise? Is it radiated or a grounding issue? [closed]

I have a BLDC motor that rotates an imaging assembly(ultrasound) and alot of PWM noise can be seen in the resultant image produced. If I play around with the RX line that carries the imaging signal ...
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1answer
59 views

Three phase motor current verification

I want to verify that the quadrature current through a permanent magnet synchronous motor (PMSM) is actually the same amount as I commanded the field-oriented control (FOC) motor controller to push it ...
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4answers
196 views

Torque and Back EMF Waveforms of Brushless Motors

For simplicity, I'm going to be talking about a single stator phase. I understand that torque is proportional to current, and that back EMF is proportional to angular velocity. However, after ...
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2answers
319 views

Controller for a Brushless DC motor (with ESC)

I have one of those BLDC Motors which are used in quadcopters and also an ESC to control it. I give it a PWM signal and it outputs the necessary condition for the motor to spin (AC signal). The first ...
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1answer
141 views

Powering a DC car vacuum cleaner with a brushless motor for better performance?

I'm making a self autonomous vacuum cleaning robot for a project and I need a vacuum cleaning mechanism to install on the robot. The problem I'm having is with figuring out how to make the vacuuming ...
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160 views

BLDC motor control PCB

I am trying to make a PCB to control a Sensorless Brushless motor. I just wanted to know if it looks right. The IC I am using is a TB6588FG it has a 2.5A peak output current. I want to use it with ...
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3answers
287 views

DIY current-limited 40A+ power supply to emulate LiPo batteries

I want to do some experiments developing brushless DC motor control hardware, and maybe wiring my own motors for my own edification. LiPo batteries aren't convenient enough, and I want ...
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103 views

Will brushless fan speed depend on amperage?

I am not a technical guy and have no knowledge in electrical subject. I use brushless fans in my regular day to day activity. We use them for pellet stoves and hence my question: Will amperage ...
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1answer
144 views

3 Phase Motor Rectifier

I have a Turnigy Rotomax 50cc engine and I am trying to rectify it. I don't know whether it has delta or a wye winding style but I suspect that it is delta(Left Picture). This is what I have so far: ...
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1answer
60 views

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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1answer
113 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
253 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
227 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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128 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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69 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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1answer
1k 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
266 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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1answer
57 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
296 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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2answers
282 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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1answer
240 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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197 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 ...