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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41 views

How do I rotate A2212 2200Kv BLDC via 220 V Ac?

I use Lipo battery (11.1V 25 C 3s) to rotate the motor. But now I want to rotate motor via 220V AC (Home supply).I followed this tutorial and successfully converted 220V AC to 12 V DC. But I am not ...
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34 views

BLDC Motor Hall Sensor Response

I'm currently developing a BLDC controller with hall sensors, curious about where the hall sensors triggered. Are they triggered when just a commutation axis becomes or around the axis (at the sector ...
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54 views

BLDC Coil Sizing / Moment of Inertia

I am currently building a bldc motor and am trying to gauge the amount of force the coils in my motor would need to generate. In order to move a desired load - to a particular speed. Without taking ...
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Is the three phase voltage output from inverse Park / Clarke a “decimal voltage”? Or is it modulated by PWM

I'm trying to understand brushless dc motor control via field orientated control, I'm watching this video here : https://youtu.be/YPD1_rcXBIE?t=588 Here we have the "Inverse Clarke/Park" ...
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Why does BLDC shaft magnetic field collapse when commutation occurs

I'm watching this video to try to understand motor control, https://youtu.be/WYJWdMV3YMs?t=420 Here the video says that one of three phases would "collapse" in its field strength when ...
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Are BLDC motors permanent magnet motors also?

I have to buy a BLDC motor and I was expecting it to be a permanent magnet motor and also when I read on internet link Where it was mentioned that BLDC motor are permanent magnet motor. But when I ...
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47 views

DIY BLDC - power supply sizing?

I am currently in the process of building a sensor-less 3ph axial flux BLDC with concentrated windings. I’m thinking 12s10p but have not yet decided. It’s just for a project - not for real world ...
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88 views

How suitable are GaN half-bridges for small brushless motor drives (ESCs)?

The drone world uses ESCs (Electronic Speed Controllers) to control brushless DC motors. Typically there are six discrete FETs, a driver IC, and a small MCU to sequence things. Typical currents ...
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34 views

Setting PMSM motor parameters

Tuning a PMSM Motor We've been using brushed and induction motors more or less forever, but are now working on converting to PMSM motors. We're doing a lot of work with the Kinetis KV31 products. I ...
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48 views

Current Voltage Curve of a motor

I have a question that has been bugging me for a while. I have an 48 W EC-fan with nomimal Voltage 24 V (voltage range 16-30V). I wanted to plot the current-voltage line of the motor so I thought of ...
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BLDC Motor Driver with ATMEGA2560

I have basic knowledge about AVR microcontrollers and AVR programming.In this days i am trying to design bldc motor driver.I want to use atmega2560 for controller of this driver.For this purpose i ...
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47 views

Powering BLDC motors using a Li-Po battery

I'm building a self balancing cube using 3 reaction wheels much like the Cubli but smaller. I'm a mechanical engineering student with not a lot of electronics experience other than the basics. The ...
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BLDC motor won't start after reversing the stator axial direction

I'm adapting a 60V BLDC e-scooter hub motor (see image below) to a custom made EV. In this specific motor, as it's designed for scooters, the wiring and the brake disc mounting are in opposite sides, ...
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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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57 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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63 views

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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98 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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122 views

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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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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55 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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35 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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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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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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76 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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144 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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137 views

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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71 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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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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54 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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64 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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67 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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396 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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62 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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70 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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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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99 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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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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163 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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29 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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33 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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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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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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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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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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280 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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79 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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35 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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50 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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