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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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Open Loop BLDC motor control, is it possible?

I have a BLDC motor to run at full speed for a brief time. The motor is equipped with three hall sensors. My question is, is it possible to realise the max speed control by setting the PWM duty cicle ...
DaveTechICX44's user avatar
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21 views

Measuring BLDC Motor Speed with Angle Feedback

I am trying to implement FoC for a BLDC motor. I have a dedicated control board(STM32H7) that receives current and angle feedback, but I'm having trouble figuring out how to measure the speed from the ...
Haoming Mei's user avatar
1 vote
1 answer
34 views

Calculate alternator power from open voltage and short current

A 3-phase BLDC motor, used as an alternator, outputs 3V open-circuit and 5A short-circuit at a given RPM. How can you calculate or at least estimate its useful power at that RPM if we connect it to a ...
ololo ololo's user avatar
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0 answers
13 views

Can I use a large ESC controller with a mini BLDC motor? [closed]

I bought a HappyModel SE0802 19000KV Brushless motor for a project. I have a 30A 2S-4S BLHeli ESC controller. Is it possible to run the motor with this ESC controller?
Pratyush Manas's user avatar
2 votes
0 answers
47 views

Why does my PMSM motor stop unexpectedly?

I have two PMSM motors, motor1 with 8 pole pairs and motor2 with 17 pole pairs I use a gyroscope to measure speed; I use PID controller1 and PID controller2 set two velocity for motor1 and motor2; I ...
adman aglee's user avatar
1 vote
0 answers
23 views

DIY BLDC motor control problem

I have made an esc (electronic speed controller) on a PCB prototyping board with sensorless, 6-step trapezoidal (unipolar synchronous switching) using the Nucleo G431 board. I am sensing back EMF with ...
Sambit Das's user avatar
-1 votes
0 answers
26 views

Help measuring the current of a PMSM with shunts

I am trying to make my own FOC algorithm (because why not?), and i ran into a problem when measuring the current of two of the three phases of the motor. The schematics are on the image The motor ...
Pablo9026's user avatar
1 vote
0 answers
37 views

Replaced MOSFET in BLDC driver keeps blowing [closed]

I have a motor and controller which, after a catastrophic fault destroyed one of the phase coils and the high and low side MOSFETs for the affected phase, I've repaired by rewinding the coil and ...
R.. GitHub STOP HELPING ICE's user avatar
1 vote
1 answer
38 views

BLDC DR8305 design 42A

I'm trying to design my own PCB to control 4 x 300W three-phase motors with the DRV8305 BLDC and an STM32F401, but I have a problem with the number of PWMs available. To solve the problem of the ...
Paulo971's user avatar
1 vote
1 answer
91 views

'Strange' behaviour due to DC motor

TLD: How do I minimise noise / electrical disruptions created by a DC motor? Situation I would like to control a DC motor through DMX512. Therefore I connected a Max485 chip to an Arduino to receive ...
Qwertis's user avatar
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1 vote
2 answers
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Large Diameter BLDC motor lacking RPMs

I've recently acquired two outrunner motors from LG washing machines to put in my kid's go-kart. It's essentially this motor - a 36N48P outrunner motor with an 11" diameter rotor. These are wound ...
Jedi Engineer's user avatar
1 vote
0 answers
75 views

How can I find out if High Frequency Injection (HFI) is being used in a Sensorless BLDC motor?

I have a small BLDC sensorless motor that runs at 34 V DC, reaches 40K RPM, has low resistance(5 ohms) between its phases. Its own driver manages to run this motor at really low speeds, 1K RPM, at ...
Rodrigo's user avatar
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1 vote
0 answers
52 views

Current Measurement of a Brushless DC motor

I am trying to measure the current drawn by a brushless DC motor under load. This is to check if the propeller and the motor are a correct fit at the desired conditions (a range of rpm, say 0-8000rpm)....
Ahmed's user avatar
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3 votes
2 answers
343 views

RF receiver frizzes when start brushless motor

I'm trying to build a quadcopter with and Arduino, and I'm facing a problem, that is the RF receiver of the quadcopter freezes (not the Arduino) when I turn on the brushless motor. ...
miguel silvestre's user avatar
0 votes
1 answer
62 views

Speed control for 2-wire BLDC motor

I found a question already asked (no answer) BLDC speed control If you are able to change speed when supplying different voltages to motor, why doesn't PWM work? Here is a pump that I need to control ...
Osk's user avatar
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1 vote
2 answers
61 views

Motor peak and continuous torque calculation

Given these motor characteristics for a BLDC motor ( maximum speed = 2000 RPM), what is the achievable continuous and peak torque with 24V input at very low RPMs (<50 RPM)?
Raj's user avatar
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0 votes
1 answer
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Supply voltage of BLDC motor increases during operation

I need some clarity on an issue I have been encountering with my BLDC motors.I am using 2 integrated driver BLDC motors to drive an RC truck sort of device, they run on 24v. For the most part it ...
Aman P's user avatar
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1 vote
1 answer
70 views

How can I use a DWS600BL washing machine BLDC motor outside the washing machine?

I have a DWS600BL 3 phase BLDC 310V motor which was originally in a Samsung WF71184 washing machine. I want to use it outside the washing machine but I do not know how to use it and if I need some ...
future_robot's user avatar
0 votes
0 answers
28 views

What are the relevant specs for a BLDC fan controller?

I have a ceiling fan with a fried remote receiver / controller that I need to replace. Oddly enough, the only specs I am able to discern are power limit (original says 38W, I can find plenty of ...
Oliver Graeser's user avatar
0 votes
1 answer
35 views

Clarke transform seems to result in more current

I am looking into the Clarke transform for a balanced three-phase system (BLDC motor) and from all that I read, it tries to preserve magnitude. So if I apply this to the case of transforming three ...
Cheiron's user avatar
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0 answers
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How do I handle up to 40 Amps continuous current in an ESC (Electric Speed Controller) for my PCB? Specifically heat generation

I have an electric longboard that can consume up to 40 Amps continuously. Here is my schematic: I have a couple questions. Do both the high side and low side MOSFETs experience the same heat ...
Trev347's user avatar
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0 votes
1 answer
64 views

Homemade ESC on BLDC

I am trying to build an ESC from scratch and am currently facing issues, as the motor won't activate. I am using an Arduino Uno and a 30V-5A supply voltage. When plugging the supply voltage, it ...
Maximilien Grattepanche's user avatar
0 votes
1 answer
88 views

BLDC six step commutation table confusion

What is the reason why there are many different six step commutation tables on the internet? No1 table No2 table Table reference: "https://lucidar.me/en/actuators/commutation-for-bldc-motors/&...
MSB's user avatar
  • 27
0 votes
1 answer
58 views

Can I safely upgrade my battery as long as I am within the voltage and current ratings of the motor? (amp limit vs watt rating)

TLDR: The real question is "Does voltage have any thermal effect on a wire with the same current?" Cause if not.. then the answer to the title question I think would be "yes" and I ...
Magnie Mozios's user avatar
0 votes
0 answers
32 views

Problem estimating LiPo battery life for powering BLDC motors

I'm trying to estimate the battery life for a system powered by a pair of LiPo batteries, in which the main loads are two BLDC motors. I estimated the battery life by dividing the battery capacity by ...
SkepticMind's user avatar
0 votes
0 answers
59 views

My motor driver does not work at high load

First of all, I apologize for my bad English. I am designing a BLDC motor driver for my university project but there are certain problems. I use IR2104 MOSFET driver integration for my motor driver. I ...
Hastrolok's user avatar
1 vote
0 answers
71 views

How to troubleshoot an H-bridge motor driver circuit? [closed]

I am running into a problem with my custom motordriver. It was designed to control two small 3-phase sensorless brushless motors powered by a 3S battery. It is based on an STM evaluation board (...
Luuk Benningshof's user avatar
0 votes
0 answers
31 views

BLDC fan control with UART

I have a BLDC motor, which I need to control for fan application. How can I implement it using UART where an input(code) is entered by the user and the motor changes it speed according to the input ...
SAKSHI SONI's user avatar
3 votes
1 answer
165 views

Air delivery rate for BLDC motor fan

I have a BLDC motor fan whose speed (in RPM) and dimensions are known. How can I calculate the air delivery rate of the fan at a particular speed? I want the formulae for knowing how much air is ...
SAKSHI SONI's user avatar
1 vote
1 answer
71 views

Issue with BLDC motor

I am trying to run a BLDC motor using my STM32 controller. I am using five N-channel MOSFETs for each phase, two for the high side and three for the low side. There is also a MOSFETs driver IC between ...
Sajid Ehsan's user avatar
1 vote
1 answer
58 views

Trouble getting current form BLDC generator

I am designing a battery charger using a BLDC motor attached to stationary bike, I was giving this project hoping to fix the current output because is delivering low amps to the charger even at ...
Ivan's user avatar
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0 votes
0 answers
45 views

Scaling up a Motor

If I take a DDR motor (Direct Drive motor like a washing machine 3 phase DC motor) and make a larger version of it so the diameter is 2x and the magnets and coils are correspondingly wider for the ...
Oliver Walters's user avatar
0 votes
1 answer
56 views

Poor Dynamic Performance on Sensorless BLDC

First time posting :) I am a Mechanical Engineer from Sienci Labs and for the past 6 months we have been developing a 800-1000W BLDC spindle for hobbyist CNC machines as a souped up alternative to the ...
Johann Chung's user avatar
0 votes
1 answer
67 views

Electronic speed controller - how to know what frequency for servo pulses? Why use 50 Hz?

I was doing a Raspberry Pi project controlling a BLDC motor with an BLHeli32 ESC. I sent servo pulses with maximum width 2 ms and minimum width 1 ms. The frequency I sent these pulses at is 50 Hz. ...
Tsz Kit Koon's user avatar
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0 answers
37 views

Motor and Controller to spin Camera Array

I am in over my depth with respect to motors and drive hardware. Problem The motion control solutions I have tried have failed due to torque insufficiency and noise. Seeking I am seeking motion ...
Go Danny's user avatar
0 votes
2 answers
82 views

How to find number of poles through commutation steps?

I powered up the Hall effect sensor with my controller and observed that my motor completes its six-step commutation in 90 degrees. To complete a 360-degree rotation, it takes 24 steps. How can I ...
Sajid Ehsan's user avatar
0 votes
0 answers
40 views

How to calculate the Motor Constant,(Kt) in (Nm/A) and back emf constant(Ke) of PMSM motor to calculate the applied torque

I have a PMSM motor with a verified back EMF of 12.7 Vrms per 1000 RPM.(Measured on an oscilloscope , Phase U w.r.t Phase V) I know that this is Ke(12.7) For a PMSM motor kt and ke are essentially the ...
AK47's user avatar
  • 101
0 votes
0 answers
29 views

Powering BLDC motor with 20V 2.5A battery

I have a Pichler Boost 20 motor. Max power load is at 25A/30s, recommended batteries are LiPo 7V or 11V. However, I'm generally against using LiPo batteries. I have however multiple batteries ...
Sterling Duchess's user avatar
0 votes
1 answer
70 views

BLDC motor with hall effect sensor

I have BLDC motor. I just powered up the hall effect sensors by connecting 5 V to my STM32 dev board and also connected the ground pin. Then I checked the voltage on output pins while rotating the ...
Sajid Ehsan's user avatar
0 votes
0 answers
24 views

BLDC motor phase sensor

I've been working on a 4 wheel differential drive robot. It has 4 brushless motors attached to gearboxes, driven by RC ESCs. I have some of these Hobbywing RPM sensors attached to two wires of each ...
Matt Williamson's user avatar
1 vote
1 answer
44 views

Pedestal fan motor enquiry

Can I use a 24 V Nidec motor on a 12 V supply DC fan? It's a Nidec brushless motor model 48F704R090 supposedly at 12 V. I suppose current will be halved?
William Tan's user avatar
0 votes
1 answer
35 views

What ESC matches criteria? [closed]

Is there any ESC, that takes PWM from an Arduino as an input, has three wires for three motor phases and has three wires for the hall effect sensors? Does this match my criteria Product ?
user334991's user avatar
0 votes
2 answers
91 views

Do 12V fans for cooling a chassis commonly need external flyback diodes?

I'm building an electronics controller. I have a chassis with a 12VDC cooling fan. It seems to me that a fan might present an inductive load to the ACDC power supply it's connected to, so I'm trying ...
Open_Hamster3337's user avatar
0 votes
0 answers
59 views

How to calculate motor flux in Webers from back emf of PMSM Motor and calculate torque in Nm

I have a PMSM motor , unfortunately not much is known about the motor and I am trying to determine some critical motor parameters, one of them is the motor flux in Webers and consequently I am also ...
AK47's user avatar
  • 101
0 votes
1 answer
367 views

(Trapezoidal vs FOC) choosing a commutation type for BLDC motor

I've been planning to build an ESC from scratch for my BLDC motor, for an quadcopter project, and I have trouble figuring out the right commutation methods for design, I did some fair amount of ...
chethanRaj's user avatar
0 votes
1 answer
53 views

Input capacitor / Inrush current

I am developing an electronic control board for a brushless motor. The motor in question is part number FR_2057_B_FMM from FAULHABER. The motor is powered at 24V and 62.5W. For the three-phase ...
Kolia's user avatar
  • 55
1 vote
1 answer
63 views

How to convert the winding of a radial electric motor to a linear tubular electric motor?

There are winding scheme/calculators and tutorials online for conventional electric motors, but I can't find any clear method of wind linear tubular electric motors. For example, this is the winding ...
Fulano's user avatar
  • 370
1 vote
1 answer
34 views

Motor for lightweight high torque application (Jumping Robot)

I am in the process of designing a jumping robot, im trying to keep the weight below 2 kg, The robot works by compressing two helical springs with a linear actuator. The maximum force reaches 350N. I ...
Hassie Jayasekara's user avatar
2 votes
3 answers
481 views

How do Hall-effect sensors work in multi-pole BLDC motors?

I'm somewhat confused on how Hall-effect sensing works for multi-pole BLDC motors. The Hall-effects sensors I have seen, for example in the image, often are in an arc and not evenly distributed. I was ...
FourierFlux's user avatar
0 votes
1 answer
44 views

Optoisolator between uC y IR2110?

I am working on a brushless driver, which has 3 IR2110 as a mosfet driver and as a microcontroller I use a stm32f103c8t6 (blue pill board). Everything works correctly, but I have the following ...
Ariel Kinderknech's user avatar

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