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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44 views

FET atmega168 - transistor needed?

I'm trying to make a BLDC controler, and I'd like to use an atmega168 as microcontroler and N-FETs (x3) to control the motor. The microcontroler will output a PWM that will control the motor's ...
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1answer
35 views

DC motor rpm change by under supplying voltage

If I have a 6V dc motor running at 20 RPM with a gearbox already attached and I only supply the motor with 5V from a cellphone charger what will my new rpm be?
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1answer
29 views

What determines BLDC rotation direction when using trapezoidal commutation with BiPolar Switching?

Block commutation seems simple enough, the rotation is determined by the order in which the 6 step sequence is executed (ex. cw 1->6 or ccw 6->1) What's confusing is how bipolar switching changes ...
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15 views

ESC pwm signaling

Can i give a pwm signal to ESC which is of 50hz but the duty cycle is not of 1ms to 2ms but from 0ms to 20ms, i.e i control speed b/w 0 to 20ms. or is it a permanent method to vary the speed by these ...
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2answers
68 views

BLDC motor without esc

I have an ESC and a brushless DC motor. I am interfacing the ESC to the motor. But I am not getting what I want, so my question is, can I directly connect the motor to the battery without taking the ...
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4answers
561 views

Higher voltage or more amps?

Im planning on building a E-Bike and have made some calculations and only need my 190rpm/V brushless motor to spin around 600 rpm to give me a good speed. So by this calculation I only need to ...
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1answer
44 views

Initializing the ESC through microcontroller

I have an esc and a brush less dc motor. the connections are given in the pictures. i have written the program for the micrcontroller such that it send 1ms high 19ms low pulses to esc for 5 seconds. ...
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1answer
44 views

ESC not starting the motor

I have a 20A ESC, I have connected it to the brushless dc motor as shown in picture. When i apply a 1ms + signal with rate of 50hz it produces beeps but doesn do any thing. i have connected the wire ...
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1answer
34 views

Load Torque Profile of two coupled electrical machines

I am trying to learn about the torque profile of two coupled machines. I believe that if a DC motor is driving a DC generator of identical ratings, the generator will exert rated torque on the motor ...
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0answers
65 views

A Simple way of Loading a BLDC Motor?

I am looking for loading a 15W BLDC motor with another BLDC machine, sort of like a master slave configuration. I'm not exactly sure how the slave BLDC machine windings should be connected. One idea ...
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1answer
43 views

Testing an h-bridge using the power supply and/or signal generator to control a DC motor

I'm using the DRV8836 (datasheet here) from Texas Instruments and can't seem to get it to work. Does it require a PWM (pulse from the signal generator) or am I able to drive it with only the DC power ...
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28 views

BLDC Motor Control - Determining PWM Switching Frequency

I've read that the PWM switching frequency should be anywhere from 200hz (high inductance motor) to 64khz (low inductance motor) in order to minimize torque/current ripple at perhaps the expense of ...
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1answer
102 views

BLDC motor waveforms

I'm trying to drive a brushless motor (BLDC) with an ATMEGA328p I use Timer0/1/2 to generate 3 different PWMs @ 62Khz. First I tried (only absolute values) $$A = \sin(T)$$ $$B = \sin\left(T + ...
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0answers
49 views

Driving cheap 10Amp BLDC

Situation: I'm a mechanical engineering student working on the electronics portion of a competition project that is using 3 bldc outrunner hobby grade motors which will be mostly free spinning. I'll ...
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0answers
38 views

PI-filter for inverter

I am to design an input filter for a inverter for a PMSM, and have som question of how to dimension this. We will use PWM for commutation of the motor, probably with a frequency of 20kHz. The peak ...
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1answer
103 views

What's the relationship between ESC pwm input and output?

I'm using ESC(Electronic speed controller) to control outrunner brushless dc motor. As you know ESC detects ppm signal between 1ms and 2 ms approximately. So my ESC detects signal between 4% and 9% ...
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3answers
89 views

Help understanding the code

I am new to C programming. I need your help in understanding the some particular lines in a code segment for sensored control of a brushless dc motor. It was written for a 16-bit MCU ...
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3answers
218 views

What is this effect causing a flash on video when a model aircraft collides with the ground?

When recently flying a model airplane with friends, I was recording on a smartphone camera (I believe CMOS, 720p, 120fps), and saw, in one of the videos, a flash that was not visible to the naked eye, ...
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1answer
77 views

BLDC speed/torque control with L6229 or L6235

I'm trying to control 12V 12,000 rpm BLDC motor with 3x120° Hall sensors using ST evaluation board based on L6229 IC. I tried to control motor's speed by feeding PWM to FWD/REV pin as suggested in ...
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61 views

Brushless DC motor or stepper motor for specific application

The specific application is for moving (or traversing) a carriage up and down a lead screw. The lead screw is rotated by a motor. Here is a rough idea: - Since 1996 a stepper motor has been used ...
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1answer
49 views

Where to buy PMSM motors? [closed]

I read a research paper that explains why permanent-magnet synchronous motors (PMSMs) are better suited for high-precision position control than brushless DC motors (BLDCs). I'd like to buy one, but ...
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1answer
69 views

explanation about BLDC motor current

I want to buy a 20kW (72V) Air cooled BLDC Motor but how do I to calculate the capacity of the required battery current? i will use this motor just to start up gas turbine engine , which means it will ...
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2answers
184 views

Can i use a PWM HHO Controller to control Brushless DC Motor?

Hi im a electronics newbie. The part im talking about is DC 10-50v 12V 24V 48V 3000W 60A amps DC Motor Speed Control PWM HHO Controller here is the link My ...
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1answer
49 views

Pedal charged and pedal powered mountain bike

Pedal charged and pedal powered mountain bike... couldn't this be easily accomplished with just one DC Brushless motor or would two motors be needed? I've seen plenty of electric powered bikes. Take ...
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4answers
412 views

Brushless 3-phase motor (BLDC) in generator mode dropping current

I am making a winch that will spool out line under tension. I've had success using an old brushed motor. I short the windings, so that when I unspool the line, the motor provides braking torque and ...
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1answer
183 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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78 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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106 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
149 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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30 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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1answer
115 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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0answers
58 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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115 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
101 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
320 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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1answer
100 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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1answer
107 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
70 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
123 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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0answers
99 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
433 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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1answer
468 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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1answer
327 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
534 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
103 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
199 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
138 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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71 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
64 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
49 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: ...