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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1answer
21 views

What will be the max voltage and current rating of this DC rechargeable fan?

**Ok forgive my use of some terms and clustered explanation I have this 5inch(13cm) DC rechargeable fan, made by lontor(some company in china but popular in Nigeria) that's rated (i.e written on the ...
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2answers
46 views

How is the technique and method to determine the optimum operating voltage of a dc motor

How is the technique and method to do measurement test in order to determine the optimum operating voltage of any type of a dc motor ? as always shown to us in motor specs e.g. ...
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1answer
40 views

Connecting a 48 V, 12.5 Ah 2C Li-Ion battery (or two in parallel) to a 48 V, 1000 W motor and 1000 W, 40 A controller

I am trying to build an E-Bike that uses a 48 V, 1000 W BLDC Motor with rated current of 35 amps and peak current of 60 amps. I have a Li-Ion battery 48 V, 12.5 Ah with continuous discharge current of ...
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39 views

Can you use Field Oriented Control with BLDC and if so what are the disadvantages?

From what I understand Field Oriented Control is meant to be used with PMSM as PMSM has sinusoidal back EMF due to distributed stator windings. On the other hand BLDC's have concentrated stator ...
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181 views

Cannot find what causes faults on DRV8353RH

I keep getting faults on a a new batch of ESC boards based on the TI DRV8353RH & Infineon IPT020N10N3ATMA1. Please consider: When starting a motor at 48V - 56V the DRV asserts a fault after ...
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1answer
33 views

How is high side switching with an N channel mosfet possible in a BLDC motor controller?

I'm trying to understand how this BLDC motor driver circuit works: Let's say we want to run a current through phases UV. Assuming we want V to be ground, then SW4 would be closed and we would have ...
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30 views

How to set the PWM signal to control the ESC Readytofly 40A by STM32?

I tried to start the BLDC motor using ESC - Readytofly 40A (from Aliexpress) and STM32. I also have the switching power supply (12V, 30A). The PWM signal working on the STM has 50Hz (I also tried to ...
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36 views

DRV8313 Brushless DC motor controller output voltage to motor is zero

I have installed two DRV8313PWP in a custom PCB and I have followed the schematic in the datasheet to control BLDC motors. After researching how to program them, i have concluded that pins EN1, EN2 ...
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1answer
40 views

Arming A Brushless Motor Controller Connected to ESP8266

I am trying to control a brushless motor with WeMOS D1 ESP8266 The motor controller and motor specs are below: https://www.ebay.com/itm/114619313561 A 11.1v LiPo battery powers both the controller and ...
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54 views

Is there a way to find out the motor phases without opening up the motor?

Good day, I am doing a group project and we have a hub motor that looks like it was rewired by the previous students. For this reason we cannot tell which phases are which. We need to get it working ...
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4answers
85 views

DC Motor Speed and Current

I have a question regarding DC motor. I was just curious to read on what factors does the motor RPM depend upon. I read that the rated voltage is the parameter that defines the speed of the motor. But ...
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1answer
56 views

BLDC motor shaft getting hot

This is a BLDC motor with the magnets on the shaft and the windings near the casing. The casing doesn't get hot only the shaft. Also my ESC shuts the motor down after a few seconds, if I throttle down ...
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65 views

4 layer PCB stackup for motor control board suggestion

This is my first high power PCB. I have been doing some reading and going through few reference designs. really looking for some guidance from the community. Please do correct me and if possible point ...
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2answers
86 views

50kW-100kW motor: BLDC or induction and why? [closed]

My friend and I are doing a sort of academic research about heavy electric vehicles. A sub-project involves choosing the wheel motor and defining the control method. Aside from what currently exists ...
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45 views

Finding RMS current of BLDC motor

I have a BLDC motor rated at 72V 1500W. I am working on an application that requires me to perform certain computations using the RMS current but I understand that I can only get the rated current ...
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47 views

Why should we choose to go for a smaller motor (4.5 kW vs 6 kW) for go-cart?

We are thinking of using a 4.5 kW motor and not a 6 kW one. Due to some constraints and rules, the maximum power a motor can have is 6 kW. So why is it recommended to use a smaller motor? And does it ...
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2answers
57 views

What are the differences between a VESC and a E-bike controller?

I'm trying to figure out how do a VESC and a generic e-Bike controller differ? Besides the custom controls and the higher rating of the VESC are there any other differences? Parts: The Vesc: 3-12s ...
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1answer
29 views

Maintaining a current in a circuit connected to multiple DC motors (3.0V) that turn on and off arbitrarily

I have a circuit that is connected to multiple DRV8833 motor drivers. Each motor driver is connected to two 3.0V DC motors. The timing of when they run and stop and how many rotations they perform is ...
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6answers
103 views

How to select BLDC motor for high torque applications

For electric vehicle I need to choose BLDC motor. Rated power around 2 to 3kW 48 nominal voltage. I don't need high speed, but would like to have high torque at low rotation speeds. There will be ...
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1answer
61 views

Can't control DC motor with PWM on Raspberry Pi

I recently bought a 24V brushless DC motor from ebay (link: https://www.ebay.com/itm/392320171299). I've been able to connect it to a 24V power source and it runs. I've been trying to control it via ...
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2answers
59 views

How to increase torque in a BLDC motor

I have a 350kv BLDC motor and a 150 amp ESC. I'm using them to run a boat prop. It spins with plenty of speed in the air but as soon as I put it in water the ESC shuts down. The battery has plenty of ...
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42 views

Current limiting circuit for a brushless motor controller

I have bought a motor controller for my 250W, 36V brushless dc motor. I think that the maximum current for the motor shoudln't exceed Imax = 250W/36V = 7A? The controller I have bought has a maximum ...
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31 views

BDCM for small DIY overhead stirrer, how to choose based on Kv?

I want to make a DIY overhead stirrer, to stir a glass of 5 Litres of pure water to bewtween 100-2000 rpm using a common impeller. I want to use a brushless DC motor (BLDC) to drive the impeller. ...
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1answer
34 views

How can i use a BLDC motor driver to control a brushed dc motor?

I have a BLDC motor driver and i wonder if i can use it as a controller for a brushed DC motor.
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How to simulate immobilizer (RC remote control anti theft device) signals using a motor controller and sensors?

We are working on an electric scooter (moped) project. We have added a PCB to it. The scooter has a remote functionality anti theft system (radio controlled like most cars). We would like to retain ...
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39 views

How to calculate the maximum Torque for a PMSM Motor?

I have a cheap BLDC/PMSM Motor from Ebay. I don't have any further Information, only a sticker: "A2212/10T 1400KV". I connected my oscilloscope to 2 phases of the motor and I have seen that ...
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1answer
60 views

Dead Time Insertion BLDC Motor Control

Im trying to build up my own BLDC Motor Controller. Now Im wondering if I really have to implement Dead Times between switching the High- and Lowside FET´s. My switching frequency is 30kHz, my Motor ...
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1answer
46 views

How to measure precision speed of bldc motor with encoder which has 1024 pulse per revolution

I am trying to control bldc with SVPWM based FOC method.I have a bldc motor with 1024 pulse encoder. I calculate speed in encoder pulse interrupt. But i can't directly calculate d(encoder pulse)/dt. ...
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34 views

Trouble with ESC & Brushless motor

I'm new in this group, I hope to be welcome and help you whenever i can. At first i need your help... i'm assembly a drone ( quadcopter ) , and testing the ESC with the motors, and i have issues. I ...
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26 views

Hall effect sensors for BLDC CW and CW positioning

Hi I have just designed a BLDC controller and I have it running in both CW and CCW directions. I have noticed that when operating in CCW the motor is less noisy and more smoother than when operating ...
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1answer
117 views

What is derivative of FFT outputs with respect to time?

I am quite new Digital Signal Processing.I am trying to implement anti-cogging algortihm for my permanent magnet synchronous motor (=PMSM) control algortihm. I follow this documentation I collected ...
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2answers
69 views

Inconsistent 3-phase BLDC current

I come here because I am struggling to understand the signals coming from my 3 phase BLDC motor current. I am using a BLDC motor with a DRV8323RS driver in 1xPWM mode with Hall sensors. I measure the ...
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53 views

Waveforms of BLDC motor

I am using L6235 to drive a BLDC motor with hall sensors, but I am not sure about the motor's wire connection. Can you tell which connection is correct by looking at the waveforms? datasheet of L6235: ...
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1answer
31 views

Is there an industrial standard switching sequence for trapezoidal BLDC motor controller?

Currently I am working on a BLDC controller for 2kW hub BLDC motor of chinese origin. It does have 63 stator slots and 56 poles. I tried almost all standard BLDC switching sequences and some other ...
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48 views

Brushless DC motor power source

I’m thinking of buying a brushless DC motor to power a watchmakers lathe, but I am hesitant because of the complicated looking, very expensive controllers and drivers that go between the motor and the ...
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37 views

BLDC does not start on its own using trapezoidal commutation

I am trying to control a brushless motor using trapezoidal commutation. I read the signals from the Hall sensors and switch the FETs of each motor phase accordingly. I run the commutation task at 1KHz....
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27 views

Coil and PM Dimensional Ratios (BLDC)

I am in the process of laying out coils for a Axial Brush less Motor. My question is - without taking turns or power into consideration. Are there any design ratios - which should be attempted. When ...
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61 views

Measure torque with a BLDC motor

I'm trying to build a bench test in order to measure the torque required to put and keep in rotation a brake which function with friction. The rotational speed for this test is slow (15 RPM) to be ...
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49 views

How does high side MOSFET on BLDC stay on

I am confused how a the high side mosfets in this diagram stay on once enabled. When turned on presumably most of the voltage is dropped across the motor coil, and so the voltage across the mosfet ...
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1answer
46 views

Using a Ebike controller for a hobby BLDC

I am looking for a BLDC controller around 750W-1000W. I have yet to build the motor itself but am thinking it will fall within the operating range of 48-60v @ 10-15amps. When I look online I notice ...
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37 views

How is implementing FOC on SVPWM switching algorithm?

I have that running SVPWM algortihm with no error. I tried to implement FOC algorithm that switching metod. But I failed. I measure phase currents (Ia , Ib , Ic) when low side switching time. And ...
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2answers
129 views

How can I test the rotor winding of a single phase brushless alternator on a generator?

Context Generator runs but no power output from the alternator. The manual gives Ohm readings for the stator, excitation and rotor windings. The stator and excitation coil are to spec and have no ...
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38 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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33 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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1answer
49 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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2answers
45 views

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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24 views

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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2answers
64 views

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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2answers
61 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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