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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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How to determine PWM Frequency of a MOSFET to drive a BLDC motor?

What are the factors determining the PWM Frequency of the MOSFET driver circuit that drives a BLDC motor. Is there any equation for PWM calculation? For eg. I need to control the speed of a BLDC ...
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42 views

Paralleling output of multiple BLDC motors used as generators

First of all, I apologize for anything stupid I say as I am not yet well versed in the proper technical terms and schematics. I wish to use several identical BLDC motors that will be spun at the same ...
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37 views

Magnetic Flux loss in PM Motors

The PM motors specially BLDC or PMSM they get their armature energy from the permanent magnets on their rotors unlike the Induction Motors in which the armature gets its energy from the Stator ...
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1answer
31 views

DC-Link capacitors sizing for 3 phase inverter, which is feeding BLDC motor [on hold]

I would like to ask about an estimate for inverter DC link capacitors, where this inverter will supply 48V 20A 3phase Brushless DC motor and it's driven using a 5 kHz PWM.
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60 views

Driving a 4-wire Hard Drive Motor

After reading many contradictory accounts of the "proper" method, I would like to clear it up: what is the correct method for driving a 4-wire, star configuration hard drive motor? What I have ...
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29 views

Calculating max weight capacity of brushless motor [migrated]

I am having trouble determining the maximum weight capacity a motor can handle. I provided the specs below. The calculations are for the top row or the 580KV model. So to start off,I'm only taking ...
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17 views

Measuring inductance of a BLDC motor

I'm trying to drive a BLDC motor typically found in a hoverboard. I don't have much information about the motor since there was no spec sheet that came with it. Only that it is a 350W, 36V motor. I'm ...
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41 views

How to find the optimal speed of a BLDC motor having hall sensors? Can we change the most efficient speed through the controller? [closed]

How do we find the speed of BLDC motor at which it has minimum electrical losses so that we design a gearing system accordingly. And can we change the most efficient speed of a BLDC motor to suit our ...
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56 views

PWM speed control of 24V DC Brushless Pump

I would like to PWM speed control a 24V 2A DC Brushless Pump using an Arduino for my nano-brewery project. I've been searching for a Speed controller on Amazon or Ebay. But, i either find brushed ...
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1answer
56 views

Difference between Field Oriented Control and Direct Torque Control

What is the fundamental difference between Field Oriented Control (FOC) and Direct Torque Control (DTC) (say for an induction motor)? Is it really the same as described in https://www.researchgate.net/...
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22 views

Arduino Uno vs Arduino MKR1000 analogRead discrepancies [migrated]

I'm using an Arduino to control a BLDC motor connected with the motor driver. It is just a simple control which I'm using a PWM as a signal. Before this, I'm used Arduino Uno pin 5 to control BLDC ...
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34 views

Difference between Hobby, commercial and MIL grade motor?

How do we differentiate between hobby, commercial and MIL grade motors? Are there any standards or regulations needed to be followed during design and development?
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54 views

BLDC won't start up by itself but with some initial help

As stated in the heading, I'm currently having a problem with driving a BLDC motor with VCC being 30 V. I'm using the DRV8320S motor driver IC from Texas Instruments. It is configured in 1x PWM ...
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48 views

Mosfets heat up in a BLDC controller

I am trying to build a bldc controller. I have the following schematic I should mention that for the gate drivers I used ir2101 ICs. Everything works fine but when I connect the motor (350w ...
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29 views

Can I operate my (typical) 8mm Bipolar stepper like a BLDC?

My project involves use of these tiny steppers in an open loop- I'm not yet certain whether I can get away with the torque compromise that microstepping would require but it would be desirable. ...
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1answer
38 views

Slew Rate related EMI: How relevant is it for motor control circuits ?

I am designing a 3-phase inverter board for BLDC Motor control. The H-bridges i use are IFX007 from Infineon. The mentioned IC has the possibility to adjust the slew rate. From what i have read, i've ...
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1answer
52 views

Understanding parts of this BLDC driver schematic

I have a couple of question on ST's STSPIN32F0A 3-phase BLDC driver and I was hoping someone can help me figure out some parts of the schematic. The schematic shows the STSPIN32F0A (pg. 1) connected ...
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33 views

Back EMF sensorless BLDC control

I am trying to detect the zero crossing point of back emf in a bldc motor in order to control it sensorless. Do you have any idea what detection circuit should I use. I am thinking about a network ...
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1answer
41 views

How to identify phases of BLDC motor without rotating?

I picked up a Wye-wound brushless DC motor with three leads, three wires coming out of it via a flex PCB. Unfortunately, this flex PCB has no color indication. How can I figure out which lead is ...
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46 views

Three phase motor driver DC link, DC bus capacitor values

I am designing a motor driver for a three phase brushless motor and have been looking for a capacitor value for the DC bus of this circuit (C1). Most of what I have found when researching deals with ...
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1answer
62 views

BLDC Motor rotor vibrates with audible high pitch beep, but does not spin. Controlled by custom motor controller

The circuit I have built (taken from the HIP4086A gate driver data sheet found at https://www.intersil.com/content/dam/intersil/documents/hip4/hip4086-a.pdf) is: The only difference between this ...
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1answer
51 views

How to drive 4-pin fan

I've been attempting to get this 4-pin brushless dc pc fan working for some time now. It has a red (+) black (-) blue (PWM in) and yellow (tachometer out). I only want this fan running at maximum ...
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1answer
39 views

Issue with driving Brushless Motor with a MOSFET Driver

So I have been given a circuit which supposedly works. The circuit was the the one shown but with a 10k resistor where the scribbles are. Q17 is an IRLM6344TRPbF N-chanel MOSFET and Q16 is a ...
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1answer
40 views

Is this basic schema of a brushless driver correct?

So you have the "logic" part that runs at 0-5V. The controller is a microprocessor that can read out the current monitors and respond to them by changing the voltages by changing the connection of the ...
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1answer
114 views

BLDC (Brushless DC Motor) vs PMSM (Permanent Magnet Synchornous Motor)

The differences between BLDC and PMSM are very small and for what I have seen while reading about it, is not clear to many of us. Most of the articles I have read say that the main difference is that ...
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1answer
62 views

hard drive BLDC motor

I can't work out what the issue with my setup to control a 2.5" hard drive BLDC motor is. I have a 3 pole 2.5" hard drive connected to the following drive circuit, but the motor isn't spinning. ...
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2answers
120 views

What PWM inputs are needed to drive a 3 phase BLDC using the HIP4086 IC driver chip?

I am building a motor controller for a BLDC (w/ Hall sensors) using a Teensy. My circuit looks like the typical application diagram in the datasheet (https://www.intersil.com/content/dam/Intersil/...
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1answer
42 views

Dc motor as torque transducer for BLDC motor

I bought a cheap BLDC motor on some Chinese website and could not find its characteristics. However, I have A28-400 24V amp flow Dc motor with its characteristics. If I'm able to build a test rig to ...
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1answer
28 views

Brushless motor esc and voltage [closed]

If brushless motor work in 22.2 volt , if I provide the ESC with 24 volt Is there a problem ? Thanks
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4answers
93 views

BLDC Motor Performance at high altitude?

How does a BLDC motor performance change at high altitude where the air density is really low? For example, say I have a given BLDC motor with given torque-RPM performance curves. Now, I assume these ...
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1answer
76 views

Pull-up scheme for Hall effect sensors on a BLDC

I looked around on here, and used google, and couldn't find a direct answer to this question. Please forgive me if I overlooked something. I am working on a board to control a BLDC motor (BLWS231D-...
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How can I get/calculate simulink bldc parameters

I tried to get the parameters for a bldc simulation https://de.mathworks.com/help/physmod/sps/ref/brushlessdcmotor.html I tried to find a similar motor to the I need (500 W, 20-25 Nm, geared bldc) ...
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1answer
55 views

Simulating 3 phase mosfet bridge with LEDs

I have a commercial 3 phase BLDC motor driver board (TI DRV8323 BoostXL) and I want to write a firmware from scratch. For testing, I want to make sure I open/close the mosfets in correct order. I am ...
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206 views

BLDC Motor Constants: Why is my Kt and Ke different?

I'm new to working with motors. Reading up on BLDC theory, it is repeatedly said that in SI units, the Ke and Kt will be numerically equal. I downloaded the motor spec excel sheet of the T1101 motor ...
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1answer
115 views

FET Switching Loss in BLDC Inverter

I'm designing an inverter for trapezoidal control of a 500W BLDC motor, using DRV8301 for the gate driver. My switching frequency is 10Khz, Vdd is 48V, and Imax=20A. I've been trying to calculate the ...
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1answer
103 views

How to calculate voltage ripple in a BLDC filter module?

Hi I need some calculation for my thesis. A found this picture on the internet. My project is almost the same. It's a pi filter for a 3 phase BLDC. The peak current is 60A. It runs from 12V car ...
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1answer
59 views

BLDC Transfer Function Inductance Value

I realize a very similar question has been asked here, but I'm slightly confused about the derivation, specifically the quantities Lq and Rq which refer to the armature inductance and resistance. I'm ...
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3answers
62 views

Difference between lower and higher current rated ESCs and electric skateboard questions

I am starting a project and would like to build an electric skateboard. Here are the specs for the parts that I have gathered so far: a. Two 90mm wheels that each contain a built-in BLDC motor. The ...
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1answer
55 views

Can 3 phase AC current be applied to a BLDC and vise versa?

I am just wondering because the designs of a synchronous motor and BLDC are the same. Could you please explain the downsides of not using the designated current?
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1answer
41 views

Can you use a 3ph BLDC controller without a potentiometer?

I'm attempting to build a 12v fan and I'm looking at controllers to drive the 3 phases of the motor. It seems every ESC i find has a potentiometer included. I want my fan to always run at full speed ...
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1answer
52 views

How are ESCs (for BLDC motors) different from Texas Instruments sensorless Instaspin kits?

I have never used an ESC before but are they current (torque controlled) or speed controlled? If we vary the load suddenly ,will it stop or it can identify the rotor position and maintain the speed ? ...
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1answer
163 views

Dealing with coupling of PWM noise into Hall-Sensors as spikes in BLDC driver circuit

I have designed the first revision of a BLDC driver board (based on STM32 and DRV8323 chips). Right out of the bath (after writing the firmware of course) I noticed that the coupling of PWM into the ...
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2answers
80 views

BLDC sensors placement

I am having some trouble in reversing the direction of a sensored 10KW BLDC motor. Motor has 36 stator teeth and 40 magnets (20 pole pairs) Apparently the hall sensors position is set for CW ...
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1answer
180 views

MOSFET H-Bridge Design - Capacitor/Diode/Resistor Selection

welcome to my first post! I am designing a small 3-phase Brushless DC Electronic Speed Controller (ESC). The design utilizes 3 half bridges and a FAN7388 driver IC. The FAN7388 datasheet has a ...
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1answer
42 views

BLDC motors,and it signals

For changing speed of a BLDC motor,Which kind of signals should i send it?and wich parameters define this signal? Wahts a duty cycle for a signal?sorry for bad english
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522 views

3-Phase Inverter simulation

I'm trying to simulate a 3-phase inverter for BLDC(PMSM) in LTSpice. The problem is that drain current is way too high and also phase voltage isn't right. **New image *One leg If I put one source(...
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0answers
97 views

MOSFETs get hots in 3 phase inverter circuit

I am trying to build a 1 kW BLDC inverter circuit. I used atmel328p processor, gate driver and 12 MOSFETs (irf3205). The MOSFETs swiches good, but when i connected to 1 kW motor at no load (with 20 V ...
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1answer
1k views

Motor current consumption and power do not match

I am working on a design and need to calculate the energy consumption of this motor: https://www.maxonmotor.com/medias/sys_master/root/8825428410398/17-EN-256.pdf. (Part No. 339252) The ...
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1answer
101 views

What frequency do BLDC motors generate?

When BLDC motor is used as generator, how does the amount of poles effect the frequency of the 3 phase AC that it generates? For example, if I had a motor with 8 poles and I spun it at 50 rpm, what ...
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4answers
488 views

Using a BLDC motor for regenerative braking

I am planning on using a BLDC motor to drive a small go-kart like vehicle. I would like to implement regenerative braking, but am having trouble finding certain details. My main concern is being able ...