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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Hi-Z state, MCU and transistors

I have a 3-phase motor h-bridge. The inputs to the motor require 3 different phases, +, -, and ...
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90 views

why do we need grounding in inverter?

i am doing simulation for 120 dg, 3 ph BLDC motor while testing the inverter with R load the wave forms are not proper (positive square wave),but if i connect ground either(supply or neutral) ...
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30 views

MOSFET selection for BLDC motor drive

This question is related with the one I asked sometime ago about the heat generated when driving a BLDC motor BLDC drive inverter circuit problem. The problem is, the MOSFET chip got heated up ...
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56 views

Is my dynamo a BLDC generator or PMSM generator?

I want to ask you about a problem please. I have bought an AC dynamo generator (the commercial name). First I don't know is it an AC synchronous generator or a BLDC generator. The dynamo has 12 ...
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29 views

DRV8313 for BLDC

I am looking for simple IC solution for BLDC driving in own quadrotor with a minimum number of components. Is it possible to use DRV8313 for that purpose? There is a lot of eval boards of brushless ...
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39 views

in order to understand bldc motors and their working principle, I read a lot on the web, and I see them like a tripolar steppers, am I right?

I was told my previous questions were not well received by the community, it was never my intent to post a repeated question or a bad formulated one, and english is my second language, not my ...
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27 views

The Hall sensor in a BLDC - winding magnetic field interference?

I am wondering what is the impact of the magnetic field generated by the BLDC windings being energized on the rotor position measurements with the Hall sensor. I found some unclear explains stating ...
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36 views

How to sense RPM from 4 pin BLDC motor?

The title says it all. I'm doing a project with a spinning HDD disk with a slot cut in it, RGB LEDs, and precise turning on and off of the colors. I'm planning to glue a magnet and use a hall ...
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49 views

ESC scheme ADC problem

I made own ESC board. Here is schematics: First, I implemented the cycle of 6 combinations of switching signals: A_H, A_L, B_H, B_L, C_H, C_L in loop using delay time before switching to next ...
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94 views

Need help with the BLDC drive inverter circuit problem

I am building a BLDC drive circuit for a 24V/60W BLDC motor. I chose SI4564DY(P+N) and FAN3278 to realize it as shown below (I only include A+ and A-, B and C are exactly the same). The FB indicated ...
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64 views

Brushless motor not turning

I'am trying to build a drone. Therefore I bought some brushless DC motors This is the only specs I have for the motors : ...
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221 views

How do brushless motors provide more torque and longer battery life to cordless drills?

I was in the market for a cordless drill and came across a drill manufacturer claiming higher torque and longer battery life since it utilized a brushless motor. Is it true that brushless motors tend ...
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23 views

Bldc motor driver compability

I looking for a drive for my sensorless bldc motor for a project of mine. 1)Will I be able to drive my motor with ESC(electronic speed controllers) used to RC hobbyist powered by Smps. 2)what are ...
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72 views

Brushed or Brushless DC motor for self balancing robot?

I am looking to balance a robot using a flywheel connected to a DC motor (think of it as an inverted flywheel pendulum). Similar to this: https://www.youtube.com/watch?v=0312BNqIBFI What I am unsure ...
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20 views

Extra Shottky Flyback Diodes on FET-based BLDC Motor Driver? [duplicate]

TL;DR: I have a FET-based BLDC motor driver design, and I need to decide whether to add discrete Shottky diodes in parallel with each FET for reliable and long-lived operation in an automotive-like ...
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68 views

Electronic Speed Controller - Brushless DC - Quadcopter

Im a student who'd doing electrical and electronics engineering. Im currently doing my final project which is a quadcopter. One of my objectives in that is to make a Electronic Speed Controller (ESC) ...
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2answers
94 views

Which of the following motors best suit as a wind generator? [closed]

I'm watching some brushless outrunners with low kv as a generator for a simple wind turbine that I'm going to build soon. It might not be a scale or fully useful turbine, because I want to build it ...
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1answer
81 views

How to interpret the equation \$e=K_e.\omega_m\$ in a BLDC context?

After researching a while on the subject, I noticed that several sources state that the back-emf constant of a BLDC motor satisfies the following equation: $$ e = K_e.\omega_m $$ where: \$e\$ - ...
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93 views

What does PWM width control in brushless motors?

For servos PWM controls angular rotation - for example 1ms width means 0 degrees and 2ms means 180 degrees (it is PWM width is proportional to angular rotation). I am not sure what PWM width ...
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22 views

How to obtain approximations to the linked magnetic fluxes of a BLDC from its specifications?

I'm using the following expression to calculate the electromagnetic torque in a BLDC: $$ T_e = ...
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3answers
67 views

BLDC max speed KV or Hz?

So from what I've understood, the KV rating for a motor gives us the rotor speed based on the voltage applied at the phase of the motor. Having looked a bit deeper in ESC / inverters, I've come up ...
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2answers
82 views

How to derive the torque expression for a BLDC?

How can I derive the torque equation for a star-connected, brushless DC motor, given its back-emfs waveforms and currents? I'm currently reading the article A Park-like transform for the study and ...
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36 views

Two voltage rails from one photovoltaic system

I'm working on designing a photovoltaic well water pumping system. I will have two 12V 120W PV panels connected in series, for a 24V 240W output (during full sunlight). Is it possible to connect a ...
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71 views

PC fan DC adapter power requirement? [duplicate]

I just bought a 120mm deep cool fan with a rating of 12v, 0.07A (70 mA)= 0.84watts Currently I only have a 12v 2.5A (2500mA) DC adapter. I'm a complete noob in electricals...so the question is- Can ...
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69 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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56 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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67 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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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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310 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
853 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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75 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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82 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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61 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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78 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
73 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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87 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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192 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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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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60 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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341 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
94 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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225 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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156 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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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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79 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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99 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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236 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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98 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
685 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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231 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 ...