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
339 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
309 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
48 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
51 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
548 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
114 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
1k 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
80 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
47 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
157 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
185 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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34 views

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
137 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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2answers
993 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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2answers
277 views

FOC speed limit motor?

I have here an FOC controller with encoder and a 2200kv, 40A, 324W motor. I can run the motor just fine and I limited the current to 4A and the motor spins up to around 1400rmp. When I now increase ...
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1answer
192 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
174 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
136 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
89 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
138 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
146 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
86 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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2answers
532 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
232 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
402 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
47 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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2k 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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1answer
2k 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
296 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
2k 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 ...
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1answer
429 views

How the Kv rating relates to power generation with BLDC motors

I am confused about how the Kv rating of a bldc motor affects the 3 phase ac it generates because, the Kv rating is based on the dc voltages that are applied to the motor by its esc. So for example, ...
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2answers
230 views

Determining optical rotary encoder RPM

I hope the first part of this question isn't too physics based for this forum but I am trying to use an optical rotary mask encoder such as this one (Optical Encoder Pair Kit) to determine the RPM of ...
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2answers
317 views

Best power supply for a BLDC motor; linear or SMPS?

I am coming into a design that uses a custom designed, 24V brush-less DC motor controller. I am wondering, is it better to power this type of system with a linear power supply, a switch mode power ...
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616 views

Regenerative braking circuit for a BLDC Motor

I am trying to design a regenerative braking circuit for clamping the voltage when it is increased due to BLDC Motor acting as a generator. Simulation wise I am getting the exact result. But when I ...
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1answer
236 views

Hard and Soft Chopping

I am controlling my BLDC (Brushless DC motor) controller with PWM technique by changing the duty cycle to reduce the power(current) in phase winding. what is hard and soft chopping in PWM based ...
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1answer
438 views

STM32405 ADC on Update Event of Timer 1 or 8

I'm not sure what I should be asking for because some of the terminology is confusing to me, but what I'm trying to do is use the two motor timers (TIM1 and TIM8) on the STM32F405 to sample BEMF on a ...
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1answer
111 views

BLDC motor's frequency

I have a 3-phase motor. I want to find out the frequency of the motor so that I can supply the required PWM frequency for the motor. My motor specification: 360 Watts (36v and 10A) rated max 30 ...
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0answers
208 views

Sensorless FOC position observer error

I am designing my own FOC (field oriented control) system, and I am trying to implement sensorless control. I have successfully implemented sensored FOC with my system on two different motors using ...
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2answers
177 views

Why should half-bridge driver have resistance in series with VCC?

I am using the three of the RT9624A half bridge driver as part of a 3-phase motor control circuit. Everything was working well in testing until I got to about 80% duty cycle and one of the drivers ...
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1answer
114 views

How this flying copter actually work [closed]

The link below shows a drone copter without any swash plate mechanism only using two bldc motors which accelerate and deccelerate per cycle creating lateral force and moment. How does it work? I want ...
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64 views

Design of ESC for bldc motor having encoder

Is it possible to vary the speed of propeller or BLDC motor from maximum value to minimum value per cycle of rotation. I mean blade accelerated per half cycle and deaccelerated per next half cycle. ...
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2answers
374 views

Why BLDC are DC motors as basically they work on ac by using inverter? Can I directly give AC supply to BLDC motor?

What I have heard is BLDC is workhorse in industry even laptop fans they work on BLDC but why they are called DC motor as eventually they use inverter to get ac as input? Can I directly give AC supply ...
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2answers
574 views

Why does my BLDC motor change behavior at high speed?

Background I've recorded torque vs speed performance of a small sub 50 gram hobby BLDC motor, the KDE 2304XF-2350. I power the motor at different fixed voltages to the ESC (electronic commutator) ...
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1answer
320 views

Low side current sensing

I’m making a BLDC motor controller application. The motor control IC (Allegro A4931) uses low side current sensing (R7,R8,R9) for controlling the motor. Unfortunately the motor IC does not output a ...
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2answers
611 views

DC motor characteristic lines

For a university project, we need to use electric motors. (This is not our area of expertise, we are aerospace engineers, not electric engineers.) We have already selected a suitable motor based on ...
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1answer
128 views

How do i determine max voltage for a custom BLDC [closed]

I would like to know the process that you would go through to determine the voltage rating on a BLDC. I imagine that it has something to do with how the coils are wrapped and the how many coils there ...
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1answer
485 views

How to empirically tune DQ current PI controllers in BLDC/PMSM motor for vector control?

I need to experimentally set the \$k_p\$ and \$k_i\$ parameters of PI controllers for the DQ-axes of a vector controlled BLDC motor. I have been looking for papers and application notes proposing ...
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48 views

BLDC BEMF unequal power-on stage length for different phases

i'm driving BLDC using sensorless method. The driving algorithm is woking fine, but on the bemf oscilogram i can see, that the power-on stage length is little bit different for each of the 3 phases. I'...
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1answer
59 views

Need help with understanding PMDC Motors

I'm running out of places - and people - who have enough understanding of the questions I am asking. Please help! I'm building a crab/shrimp pot puller. I've seen the regular production models and a ...
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0answers
82 views

Issue with RPi and BLDC controller board

I'm having some trouble figuring out what I'm doing wrong so hopefully someone can spot my error and help set me straight. These are my motor and the board with everything labeled. Then below that is ...