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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2answers
48 views

Reverse engineer VFD control signal from schematic

There's a TLDR at the bottom! I got a brushless DC motor and VFD from an old treadmill, both are Baldor brand. Unfortunately it looks like they were made by Baldor specifically for this treadmill, and ...
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31 views

MPPT Three-Phase Rectifier - BLDC Generator Project

I'm building a MCU controlled 3phase rectifier that allow voltage and current control. The generator is a BLDC motor (Kv=100, Imax=30A, Poles arrangement=36N42P). It will produce from 16v to 50v ...
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Working of the Peak Torque in a BLDC

We have a BLDC motor of the following specifications , and I wanted to ask that :- If the Peak Torque lasts for about 10 seconds once activated, then after what time interval can it be activated again?...
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How to select appropriate capacitor for an H-bridge

PROBLEM: Considering the figure below, I need to select an appropriate bank of capacitors for a 3 half-bridge brushless controller, which system have this characteristics: VM = 60v (maximum); Max ...
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1answer
40 views

Can Brushless DC Motor (BLDC) be used as Stepper Motor?

I have a BLDC motor and I am keen to know if there is a controller out there that can allow BLDC to be used as stepper motors with (holding torque and accuracy in step size) I know BLDC motors are ...
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How does one calculate change in motor speed due to field weakening?

In field orientated control (FOC) of a BLDC motor, when applying an \$I_d\$ current, one can effectively change the 'speed constant' of the motor. I want to be able to calculate specifically how much ...
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31 views

How to choose a PM motor for its generation charcterstics?

I have to run a device that consumes 250Watt at 36V and now I have to power it using a generator. Now I have 2 options for this: 1-BLDC motor (permanent magnet) which consumes at 24V @ 250Watt, max ...
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1answer
52 views

Potentiometer vs Arduino, How to replace? [closed]

I have a bldc motor control board(ESC) with potentiometer, the pot is used for controlling speed but I want to use arduino's pwm, so how to remove the pot and replace it with arduino connections? The ...
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1answer
29 views

How to account for differences in measured DC resistance of motor winding

I have five small brushless DC motors from KDE, model# KDE2315XF-2050. The specs for this motor state that the winding resistance is 0.034 Ohms, and having conversed with KDE, they state the winding ...
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31 views

Can one use 5A transistor for motor driver of BLDC motor 920kv?

I am designing an esc for 920kv motors. For Code testing purposes on microcontroller, I want to make a low speed circuit but only have TIP122 (5A transistor) available in hand. Can they handle ESC ...
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28 views

How Can I calculate the Value for Pre-charge resistor?

This is the wiring for a 4000-watt bldc motor controller From Kelly company, if I'm using a 1000 Watt controller what will be the value of this pre-charge resistor? As I don't have the wiring from the ...
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86 views

How can I improve the design of my electronic speed controller?

We have a brushless motor with the following characteristics (Slow(8T)): For that motor, we are developing an electronic speed controller using the hall sensors. The microcontroller is an atmega328p ...
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Gate driver MOSFET combination zero-crossing phenomenon

This is the link to my initial question and my own answer which has the question I want to ask now. ST AN1946 p.10 says: "The zero-crossing detection can also be done when PWM is in an "ON&...
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1answer
71 views

Disconnected winding phenomenon

ST AN1946 p.10 says: "The zero-crossing detection can also be done when PWM is in an "ON" state if the compare value is set to the half value of the DC bus." It makes complete ...
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1answer
92 views

What are these pull-ups for on BLDC driver reference schematic?

I'm trying to design a simple BLDC motor controller using L6234 driver IC. Looking at its application reference schematic I came across some weird pull-ups (highlighted in green, I assume these ...
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Is this how to make an Arduino based BLDC motor with MOSFETs and push pull optocouplers?

simulate this circuit – Schematic created using CircuitLab I know there is lots missing, but rather than ask what I did wrong, I'd like to know how to do this right. I will be updating the ...
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Why are Halbach Arrays useful in PM motors?

I understand how Halbach arrays strengthen the magnetic field on one side of the array. I also know that, in a permanent magnet (PM) motor, there is already a limit on the air gap flux you can design ...
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1answer
24 views

BLDC 3 phases low side current sensing

Hello I'm struggling with calculation of BLDC motor current. I'm using MP6540 driver for controlling BLDC. I can measure voltage (adc) and after using appropriate formula from datasheet I got current ...
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42 views

Unexpected ESC behavior upon propeller contamination [closed]

Background: I am investigating propeller behavior upon contamination. For that i built a test rig with one DJI E800 brushless motor, E620s ESC (sensorless) and standard prop. I am giving the ESC a ...
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1answer
44 views

What is the simplest way to turn on the ESC with PWM input?

I have an ESC like in the picture and I want to test a motor with it. I don't have any PWM source. Can I connect something simpler (like a DC source) to it to make the motor rotate? (Red arrow points ...
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1answer
45 views

Help using an FOD3182 OptoCoupler

So this is the Optocoupler I will be using: https://html.alldatasheet.com/html-pdf/505064/FAIRCHILD/FOD3182/978/2/FOD3182.html My question is with the schematic of the data-sheet. Using Ni-multisim I ...
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56 views

Driving Power MOSFET with Optocoupler Problems (Component FOD3182)

simulate this circuit – Schematic created using CircuitLab So I am trying to build a BLDC motor controller using a Teensy4.0, FOD3182 Optocoupler, and some power mosfets. Currently I am working ...
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2answers
55 views

Encoder vs Hall Effect for FOC control of BLDC

I've been reading into field orientation control a bit (specifically I want to design a position controller), and it seems that there are three ways to get to position feedback Hall effect Encoder ...
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1answer
38 views

Brushless DC motor terminal inductance

I am working on designing a reaction wheel using a BLDC motor. Ho w can I calculate the terminal inductance (in H) for a brushless DC motor with the following properties: ...
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47 views

BLDC back-emf measurement

I am trying to make a sensorless control system for a BLDC, using "Trapezoidal control", see here: https://www.ti.com/lit/an/sprabz3/sprabz3.pdf?ts=1610192643720&ref_url=https%253A%252F%...
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39 views

BLDC Y-shaped motor with Hall sensors generating different combination of back EMF on windings with different direction?

I have a BLDC Y-shaped motor. I connected the Hall sensors and winding to a logic analyzer to see the combination of back EMF on thr windings. My intention is to eventually create a commutation table ...
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70 views

DC motor smoother speed control with PWM

I'm using an L298N motor driver to control a DC motor. I'm using only a single input pin since I need only a single direction control. I'm using a PWM pin on my Particle Photon (uses Arduino libraries)...
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25 views

BLDC motor equations

I've read this article about driving gimbal motors. I have some questions about these equations: I don't understand what "ψ" and "Lω" means and generally i don't understand how to ...
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1answer
43 views

BLDC motor and drive power loss calculation for dynamic application

what I have done so far: calculated torque and speed of the motor (robot arm swinging mass) used equivalent circuit for DC motor as model for BLDC: U_terminal=L* di/dt +(I_o+ I_load)* R_ph-ph +k_emf *...
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1answer
19 views

Controller of BLDC internal vs external rotor

The 3-phase permanent magnet BLDC motors come in two types, internal rotor and external rotor. Mostly the external rotor types are called Hub motors as they are used in electric bikes. Both types of ...
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2answers
32 views

Motor Mechanical Torque vs Motor Electrical Power

Let us say there is a constant load which is driven by a geared 3-phase ACIM (AC Induction Motor) of 5kW power rating. The mechanical load and its speed is constant. If I would need to replace this ...
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1answer
38 views

Motor rewinding - saturation concerns

After reading a lot about 3 phase BLDC motors there's one concern that's nowhere to be found. Let's say that we have a 1000 Kv motor and we want to rewind it to 10 Kv to get unrealistically high ...
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21 views

Supposed to be a trapezoidal BLDC Back-EMF waveform?

INTRO: The project bellow was designed in simulink to drive a BLDC motor. It has a matlab function that basically receives the rotor's angular speed (w) and using N = 6 (N is the number of pole pairs) ...
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1answer
43 views

Correct arrangement of current sensing resistors for a BLDC motor?

I am designing the current limiting (fault detection) circuit for a three phase BLDC motor and I wanted to ask, If I have three switches on at any given time (180 degree commutation) than should the ...
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35 views

Advice dc motor for 265mm size radial fan blade

I modeled a fan (link 1 has the image) and used a drone brushless motor (KV720) for this model. My goal is to reach 2500 rpm, but the dc motor drew 10+ amps at 12 volts and 1000 rpm. When I pushed a ...
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128 views

Can I wire multiple brushless motors in series or parallel?

EDIT: As Bruce Abbott pointed out in his answer, it's not possible to connect 3-wire brushless motors in series, since you don't have access to both ends of each winding. Oops. So, the more relevant ...
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1answer
40 views

Where to find winding diagram for a 56 pole 63 slot BLDC motor?

I'm working on an algorithm to control a BLDC motor with 56 poles and 63 slots. I'm using trapezoidal control. By employing usual switching sequence (CA - CB - AB - AC - BC BA) I'm missing one step in ...
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Concept of a concentric-double-slotted axial flux permanent magnet machine (motor)

I am after a design of a permanent magnet machine which is very constrained in the axial direction, but basically unrestricted in radial one. I also need significant space for the shaft hole. The ...
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33 views

ICE-electric transmission drivetrain parameters

Pardon me if this question covers too many elements; also, originally I posted this in Engineering stack-exchange but it may be more relevant here. Basically I do not fully comprehend what would be ...
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1answer
44 views

Trying to determine the internal construction of a BLDC Motor

The motor is an Electrocraft RPX52600V12. The datasheet indicates 14 poles, 12V, 20.5A, .6 Nm, 1 Ohm, and .6mH. It is 'Y' connected. There is no access to the common center connection. I don't know ...
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Can small earth magnet’s (1/8” thick x 1/4” dia.) glued to the outside of a jigsaw with a brushless motor cause damage?

I have attached 4 small earth magnets to the outside of my (brushless motor) jigsaw to keep extra blades handy. Could they damage/interfere with the motor in anyway?
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BLDC low-side gate oscilations

I am developing the BLDC motor controller board and I have problems with low-side gate driving. I am using MC33035 BLDC motor controller. PWM for speed control is fed into low-side MOSFETs. High-side ...
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165 views

Why does MOSFET get damaged when used as a switch in a RF remote control circuit?

simulate this circuit – Schematic created using CircuitLab Update: The MOSFET gets damaged when not running the motor even once. Maybe even without connecting the motor at all. There is an alarm ...
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1answer
45 views

Control motor braking with PWM

I'm not very experienced/knowledgeable in electronics so this may be a bit of a dumb question. I'm building a carbon fiber filament winder for which I need to be actively controlling the tension in ...
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1answer
37 views

Determining the shunt resistance for DRV8301 BLDC Gate Driver

I am trying to study how to drive BLDC (Brushless DC) motors, and got stuck in the current-sensing part. I am using a DRV8301 Gate Driver IC, which contains with shunt amplifiers. My current ...
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1answer
80 views

How to calculate the torque constant for a BLDC motor

I am designing a 12lb hobby robot with a 1000Kv BLDC motor at 14.8V nominal voltage and stall torque of 30A. How do I solve for the torque constant. I have seen equations where Kt(torque constant) = 1/...
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39 views

Brushless motor vibration/jitter/noise

I am currently using these motors and driving them off these drivers and an arduino uno, and alternatively trying to make them turn using the setup in step 6 (both with l298n and without) in this ...
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2answers
240 views

STM32 - ESC : Problem with my BEMF

I'm making a ESC for my BLDC motor. I used a STM32 (to generate my PWM), 3 IR2101 mosfet drivers (https://www.infineon.com/dgdl/ir2101.pdf?fileId=5546d462533600a4015355c7a755166c) and 6 mosfets to ...
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0answers
41 views

Isolate coil from battery using two transistors triggered by Hall sensor

My current, simplified pulsed electric motor driver circuit is shown in the image below on the left. The base of the PNP transistor is connected to a A3144E Hall sensor, and this pulses the coil when ...
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30 views

Multiplexing 3 phase motor driver signals to drive a BLDC motor bidirectionally

I have this unidirectional 3 phase motor driver powered by a 3S LiPo battery and want to make it be able to switch direction of the brushless motor connected to it within software. The way to reverse ...

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