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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Can I Move a wheelchair with two outrunner motors?

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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33 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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91 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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47 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
35 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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57 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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17 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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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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38 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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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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31 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
35 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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33 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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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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2answers
81 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
51 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
255 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
239 views

Inferring back emf from oscilloscope

I have this stepper motor with unknown back EMF / RPM. There are 200 steps/rev (i.e. 1.8deg step angle), and 8mH "phase inductance", but I'm not sure if that's enough to calculate back EMF. I hooked ...
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25 views

BEMF and zero crossing point detection

I am trying to control a BLDC motor without sensors using BEMF method and zero crossing detection. I managed to detect the zero crossing point but I am not sure if it is correct. I read that the hall ...
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2answers
73 views

Bulk Capacitor for Motor Driver

I'm creating a motor driver for a BLDC motor. I was wondering how we can calculate or choose what capacitance we need for our purposes. We're using the motor driver for a chain drive /transmission ...
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63 views

HIP4086 Driver Failing After Connecting to BLDC Motor

Update: A Renesas Tech pointed me to the documentation for the HIP4080, which is basically a two leg version of the HIP4086, but with much more thorough documentation. I now have three working ...
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1answer
40 views

How to calculate torque of a 4-pole BDC hobby motor

I have a hobby motor that claims to be a 2200KV motor. This particular one is a 4-pole motor. Using a drill, I spun the motor at 1312 RPM. On an oscilloscope I see 1.3V peak-to-peak waveform between ...
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45 views

What is the function of series inductors on the motor phases of a commercial brushless EC/BLDC motor controller?

While designing my own BLDC controller I got curious about how the big boys do it and opened up a commercially available one (Maxpos 50/5). Most things were quite straightforward, except a 11.3uH ...
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37 views

BLDC bemf shape

I am trying to detect the zero crossing point of the BEMF voltage in order to control the motor sensorless. The following picture shows the ideal shape of BEMF and in many application notes or ...
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1answer
99 views

12v DC brushless PWM fan burnt out via Arduino Uno

I’m working on a project where I want to control the speed of a fan using a microprocessor. I read several posts about using an Arduino Uno to control the PWM function on a 4 pin fan you find in PCs, ...
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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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183 views

bldc motor, esc and battery draw, nominal vs peak

I want to better understand how Electronic Speed Controllers (ESC) work for BLDC motors. Specifically, I am trying to understand battery current draw. Question 1: When an ESC is rated at 200 amps ...
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2answers
108 views

How to measure DC motor (used as generator) efficiency using homebrew methods?

Background I'll be making a "micro thermal power station" in the single-digit watt range at home (one-off, educational project. Bear with me). A heat source, likely ethanol, will cause a stirling ...
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1answer
86 views

Why P and N channel MOSFET is quite hot during braking of 3PH BLDC motor?

IRF4905 datasheetIRF 3205 Datasheeet I am working on a 24-volt BLDC 3ph drive application. I have made this design with a basic understanding of p and n channel MOSFET. In this design, MOSFET gate ...
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1answer
69 views

Dynamic voltage divider

I'm trying to build an ESC (electronic speed controller) for three phase brushless motor. I found some intresting circuits but I am trying to build something very easy to do, with mosfet and pc817 and ...
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75 views

BLDC startup algorithm

How do real world algorithms for sensorless BLDC motors handle startup under load? Right now I run phase 1 for a few milliseconds to get the rotor in a known position, the I run open loop for a ...
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3answers
65 views

bldc regenerative braking, braking torque

I'm trying to figure out the braking torque calculation for a BLDC simulation. Now if I'm looking at a datasheet I know the torque at a given rpm at acceleration. If I brake with regenerative breaking ...
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1answer
29 views

calculation of torque constant based on bldc datasheet, getting different torque constants

I'm trying to get the torque constant of a bldc. Based on this: how to read datasheet I just divide the torque at any given point with the current. I tried out that method with different values and ...
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2answers
74 views

Mosfet Driver - High Side Output Problem

I've been trying to make a 3 phase inverter to drive a BLDC motor. Mosfets : IRF3205 Driver : IR2101 Supply voltage for FETs and drivers : 12V BLDC : https://media.digikey.com/pdf/Data%20Sheets/...
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2answers
61 views

A2212-15t 930kv brushless motor voltage limit

So here's the thing, I am planing on buying those brushless motors (a2212-15t 930kv motor) and I was planning to use it with 5 li-ion battery. I was gonna do this until I saw the line saying: No of ...
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2answers
43 views

BLDC Motor max load

Hi i have a BLDC moter https://www.banggood.com/350W-48V-DC-Brushless-Motor-Geared-Ebike-Tricycle-Kit-Engine-Electric-Scooter-p-1419702.html?akmClientCountry=NL&rmmds=cart_middle_products&...
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3answers
62 views

How to make sense of speed vs Torque curves in speed control mode

I am operating my motor in closed loop speed control mode using motor controller. Toque vs speed curves gives us a relation between them which is one-one correspondence. But in a closed loop speed ...
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1k views

What's the output of a record cartridge playing an out-of-speed record

I'm very interested in vinyl records and analog music, and the belt of my turntable got loose. Upon such situation it piqued my curiosity, what is the output signal at the end of the arm cartridge ...
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112 views

Motor is consuming less than rated current and more than rated power

I have a brushless DC motor of following specs. I am using a roboteq controller to operated the motor. While running the motor i have collected the few params and here are the plots. power curve - ...
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38 views

Regenerative energy Dissipator for BLDC motor

I want to design a circuit to dissipate the reverse energy from BLDC motor, can I use PWM control technique in voltage sense circuit in order to switch on the power circuit? In detail : In my ...
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46 views

How does recuperation works in BLDC?

Using BLDC wheels is common on electric transport. A wheel is a multiphase motor, where each phase(coil) is separated from power source(battery) with some kind of transistor, driven by PWM-like signal....
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2answers
128 views

MOSFETs blowing up on BLDC motor controller upon battery connection

I'm trying to build a sensors motor controller for a 500 watt bicycle hub motor. The problem I am having with it is when I connect power (4500 mAh 12s lipo) I usually destroy a transistor or two ...
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31 views

BLDC acceleration curve

I am currently working on an solar powered RC-cart that is being driven by an BLDC. By working on this project I was searching for a way to calculate the acceleration time of the cart. Is there a ...
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59 views

mutual inductance of BLDC motor

I want to use BLDC motor for charging the E-rickshaw for that I need to find the parameters of the motor. I have measured the Resistance and self-inductance of the motor but I am facing difficulties ...
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22 views

Motor-side of BLAC supply goes into overvoltage when regenrative braking using an LM5060

I am currently using an LM5060 for protection of the motor supply on my BLAC motor driver. Everything works well until I decelerate the motor quickly, this makes the supply voltage peak above the OVP ...
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1answer
37 views

3 Phase PMSM Motor Current Measurement: Figuring out the 2 negative terminal currents with 1 positive current measurement

I am trying to implement F.O.C for a PMSM machine with a custom made inverter board. The H-bridges are from Infineon (IFX007T) and they provide current sensing capabilities. The problem is, i need the ...
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1answer
143 views

Why is back emf of bldc trapezoidal?

I am trying to understand why would the back emf in bldc be trapezoidal. Lets consider a simple motor with two stator coils placed opposite to each other. Lets say a bar magnet is kept as a rotor. If ...
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1answer
35 views

PWM phase voltage and current measurement for power consumption calculation for a BLDC MOTOR

I have been trying to log both voltage and current from the battery of an electric two wheeler for finding out efficiency at inverter, battery level.
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I have designed and 3D printed a new motor that was based on a video i saw earlier, however motor keeps stuttering and wont turn, what went wrong?

Figure 1 Figure2 I started by doing 150 turns on each coil making sure they were winded in the same direction, then connected the starting point of each coil together and took each phase winding to ...
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1answer
58 views

Powering 36V motor with 48V LiPo battery through a motor controller [closed]

I am planning to use 36V BLDC motors from a hoverboard, (this one) with this motor controller. The controller mentioned can handle up to 50V, 60A continuous. I would appreciate it if someone can ...