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
32 views

Motor for large speed range

I am designing a chuck for which I need a motor which can go from 200rpm to 5000rpm. I tried a 1000KV BLDC with 12V supply, but the minimum rpm was around 1800. Also, I am not sure whether stepper ...
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657 views

Problem with BLDC motor drive using PWM

We are trying to speed control a BLDC 48V 500W hub motor using hall sensors. We are using IRF540N MOSFETs with IR2112 gate drivers and Arduino as MCU. We implemented the 3 phase inverter and in ...
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30 views

FOC electrical angle offset calculation with absolute encoder

I'm currently developing a motor controller with FOC (Field Oriented Control) and I have some trouble with the offset calibration of a motor. What I actually do to calculate the offset: I inject a ...
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47 views

An STM32 based board with some confusing configuration [closed]

This may come a little bit confusing but I will try to explain as clear as I can, thanks in advance. Now, there is a board (custom board not a commercial product) which shaped as a circle with ...
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21 views

How to limit max power of BLDC motor [closed]

I am working on an e-bike project. I have a 48V 2KW bldc motor. Max current draw by motor is rated 33A. I also have a controller rated for 33 A. Unfortunately regulations limit the max power for a ...
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3answers
97 views

Problems with dc motor driver design: Mosfet fail

I made a brushed dc motor driver. The motor speed is controlled with PWM (from an Arduino). The motor that I'm using draws 3 amps without load. This is the schematic: As you can see there are two N ...
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4answers
115 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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2answers
344 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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53 views

Voltage Regulation to Brushless DC Motor

I am using a 12V brushless DC motor (peak current 4.6A) and I would like to have speed control over it. Link to pump I am using: https://daviescraig.com.au/product/ebp40-electric-booster-pump-12v-...
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3answers
88 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
148 views

What are the functions of the diodes in this BLDC controller circuit?

I'm trying to understand the function of the diodes in this snippet of an automotive BLDC controller. I believe that D102 is for over-voltage protection, and reverse polarity protection. Also, I ...
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2answers
47 views

Infinitely linear torque with current in motor?

I'm trying to find the maximum current my brushless DC motor can handle. If I can keep the coils and cabling cool (in a freezer right now), is there any other fundamental limit I may hit such as ...
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1answer
93 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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69 views

Hobby BLDC motor KV underrated voltage

tl;dr: I'm running a motor with 168KV with nominally 48V and 8064rpm at 20V and instead of 3360 I only get 1400rpm without a load, why!? How does the KV rating of a brushless DC motor come together? ...
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1answer
25 views

Can analogue Hall sensors be used in BLDC for static angle measurement?

Everything I have read on using Hall sensors with BLDC motors appears to use latching hall sensors which provide repeatable latching angles as the magnetic fields change at specific angles. I am ...
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1answer
126 views

Difference between mosfet

I'm working on a 3 Phase brushless sensorless driver ( Allegro A4960 ) I need to drive different motor in term of power. The voltage is 24V but the current per phase varies from 1A to 6A. So I'm ...
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1answer
328 views

Relationship between offset in electrical angle and BLDC motor performance

I am controlling a BLDC motor using Field Oriented Control (FOC). I use a 14-bit absolute encoder to read the rotor's position \$\theta_{m} \$, and use it to reconstruct the electrical angle \$\theta_{...
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2answers
49 views

Brushless DC motor steady-state performance modeling

For a brushed DC motor, there are the well-known differential equations describing the electrical and mechanical behaviour: \$V_a-i_aR_a-L_a\frac{d}{dt}i_a-k_e\omega_a=0\$ \$k_ti_a-J\frac{d}{dt}\...
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2answers
44 views

Changing push-pull transistors in brushless motor driver

I am fixing a brushless motor driver that has 6 MOSFET transistors, 2 transistors for each coil. I have found that SW5 is burned so I changed it and everything now works well. However, I have heard ...
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3answers
3k views

Efficiency comparison between six step and FOC for a given motor

For a given PMSM motor with sinusoidal back-EMF, it can be driven by either six-step (as in drone applications) or by FOC (as in servo control). However, for a given motor and given DC link voltage, ...
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4answers
134 views

How can I run my e-bike wheel on AC power?

I have an electric wheel designed for an electric bicycle conversion. By my understanding, the wheel is essentially a 48V, 1000w rated brushless DC motor. It comes with a thumb throttle and kill ...
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8answers
237k views

How are current and voltage related to torque and speed of a brushless motor?

I know that electric vehicles have different performances depending on battery and motor, but it's not clear how electrical and mechanical units are related. Can anybody please help? Will a 100V ...
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2answers
77 views

Can I Move a wheelchair with two outrunner motors? [closed]

I am trying to turn a wheelchair electric and want to use a VESC to do so. However, I was wondering if an outrunner brushless motor with a belt to a larger gear would be effective and could move the ...
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0answers
38 views

Input of BLDC motor

Among the brushless DC motor, is there a motor with two input wire? I thought that bldc motors with hall sensors should have 2 input, but it was hard to find such one. Is it wrong concept about bldc ...
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1answer
93 views

Brushless motor back and high current and IC

I'm trying to replace the brain of my neato vacuum which is broken. I've already repair a cleaning MOP but with this one I have a problem with the brushless motor which is throwing some party fun in ...
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1answer
163 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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51 views

Ground noise while driving bldc motor

Edited I am trying to drive 3 phase bldc motor using my controller. The controller works fine but I noticed that there is a noise in micro controller output pins. The micro controller output behaves ...
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2answers
46 views

Trapezoidal vs sinusoidal BLDC motor, back EMF speed caclulation

First of all do these motors differ electrically and if yes, how? Can you measure BLDC generator speed using back-emf independent of its waveform type?
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1answer
113 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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2answers
58 views

Cannot run BLDC motor at peak current and low RPM

I have a hub motor: https://www.uumotor.com/4-5-inch-350w-hub-servo-motor.html I know that the motor requires 12A but I can only supply 2.5A using my motor controller. The problem I have is when I ...
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0answers
19 views

How to Implement this BEMF Observer

I'm using the lecture by Dave Wilson at TI to implement a BEMF observer. I have the motor winding currents for phase A, B and C. I also have the Bus Voltage I also am in the stationary reference ...
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1answer
145 views

For Brushless DC Motors would one expect harmonics to be different between Delta and Y stator windings?

Given two 3-phase brushless DC motors with the only difference being that one is wound delta, the other Y with center grounded, would I expect to see high frequency voltage-current harmonics to be ...
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21 views

Aluminum Electrolytic Capacitor submersed in synthetic (PAO) oil

We are testing solar water pumps which have the 3phase inverter for the BLDC in the down hole pump. The boards (one power board, one controller board) are submersed in the lubricant oil that is used ...
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1answer
200 views

Motor regeneration Circuit Issues

I've been trying to get a motor regen power dissipation circuit working that I pulled from here. The circuit works as provided but when I attempt to modify the load resistor, the mosfet is not longer ...
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2answers
39 views

Circuit Analysis Involving DC Motors

When it comes to simple circuit analysis, there is millions of tutorials on how to analyze a resistor circuit, a RC circuit, or those involving LED the non-ohmic devices. However, I did not find a ...
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1answer
860 views

24v brushless DC Driver Pinout

I have some Brushless DC Motors with drivers and I need some help finding the pinout of the drivers. Please take a moment to view the pictures here, clicking on a picture will show its higher-...
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17 views

Brushless motor (Delta-wye switch or overvolting at lower current drown)

I have been playing with Motor CAD for a while and can't decide what to do. Here is my problem. I have a building a two-hub electric mountain board. I have motors that are rated for 350W 36V which I ...
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32 views

voltage multiplier DC from BLDC three phase motor

Hi there engineers and electronic experts, I'm doing some research about regenerative power from BLDC motor three phase. Motor is 1000W rated, with 3 wires for three phase output. The idea is to use a ...
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1answer
43 views

What is the state space model for a BLDC motor

I wanted to model a brushless DC motor so that I can add controllers(PID ) to correct the transient state behaviors. I started to model my BLDC and I found some model. Then I used specs from MAXON ...
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1answer
150 views

BLDC controller

I have to design a controller for three phase BLDC motor. In BLDC motor, for each hall sensor signal combination we have to to energize two sets of stator phases. But how to correctly identify which ...
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1answer
35 views

BLDC ESC Reverse Direction with MOSFETS

I have a basic hobby ESC connected to a motor, and the ESC inherently is unidirectional (without firmware changes, which I am trying to avoid). Is it possible to wire up 4 MOSFETS to two of the phases ...
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2answers
2k views

BLDC Motor - supply current vs line to line current

I have a BLDC Motor. I am measuring the current coming from the DC power supply. How is the measured current related to the line to line current? Thanks
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36 views

Two brushless motors mounted together, magnetic interference?

This migth be a bit of an odd question... I got two brushless motors from an old air-board. They are 350 W each and I'm thinking of mounting them together for better torque. But what would happen? ...
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1answer
178 views

OpAmp for FOC current sensing on a BLDC/PMSM

How critical is this pull-up resistor to Vdd for current sensing in a Field Oriented Control of a BLDC or PMSM? Right now, I don't have that pull up...I'm running the shunt resistor voltage straight ...
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1answer
191 views

Maintaining fixed shaft position of BLDC/PMSM

I intend to control the position and speed of a BLDC motor (still to be selected) using field oriented control (FOC) and an Encoder to determine shaft position and speed. From what I understand from ...
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2answers
44 views

Determine efficiency, voltage, current from motor characteristic curves

I would to identify efficiency, voltage, current for a particular Brush less DC motor in our lab given characteristic curves. Electrical specifications are The operating conditions are ...
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2answers
89 views

Cheap alternative to limit inrush current (eg. relay bypassing a fixed resistor or MOSFET)

I'm editing the question because several (great) answers focus on the fact that the LTC3780 module (inside ajustable my power supply) can handle the inrush current (maybe, maybe not). I'm glad to know,...
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2answers
55 views

SVPWM: Does setting modulation index to 0 still consumes power?

I've implemeneted a 3rd harmonic injection SVPWM (Space Vector PWM) scheme and it performs quite well. One peculiarity i have noticed was, when i set the modulation index to 0, the motor stops as ...
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4answers
258 views

Brushless motor design with additional separation layer at the air gap

As a thought experiment, I was thinking about how to actuate an passive impeller inside a tube from outside, contactless. Imagine a tube equipped with an impeller inside it. The impeller is mounted in ...
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1answer
216 views

Tuning PID coefficients for stationary stability of brushless DC motors

I'm using a commercial off-the-shelf brushless DC motor controller. It combines a PID controller and an absolute encoder to regulate position. When my motor reaches its target state, it generates a ...