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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278 views

Gimbal motor periodically shaking back and forth instead of spinning

I am using the BGMC2 (http://www.rovertec.com/products-bgmc2.html) to control a gimbal motor (http://www.iflight-rc.com/ipower-motor-gbm5208h-200t-brushless-gimbal-motor-with-as5048a-encoder.html). I ...
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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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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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192 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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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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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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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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65 views

SVPWM for BLDC Motors: Switching Losses vs Neutral Point Voltage Swing/fluctuation

I am implementing a SVPWM (Space Vector Pulse Width Modulation) scheme for a 3-phase inverter (3 H-bridges, nothing fancy) to control a BLDC Motor. Since one can choose which zero vectors (000 or 111)...
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163 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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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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1k 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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184 views

Low frequency PWM Brushless DC Motor Speed Control

I am programming a L293D motor driver with a BLDC motor to spin at speeds of 60-300 RPM. It is for a hybrid drone/car where I want the motors to spin slowly while having the necessary torque to drive. ...
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134 views

My BLDC motor is stuttering and I have no idea why

I'm driving 2 BLDC motors with two ESCs, the motors and the ESCs are powered by an external LiPo battery and the Arduino is powered via usb. The motors work with pulses between 1000 and 2000 ...
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323 views

Meaning of motor constants for three-phase PMSM

When looking at three-phase permanent magnet synchronous (brushless) motors, \$K_T\$ and \$K_V\$ numbers are often specified. Also, controllers for these motors typically specify maximum currents. ...
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116 views

SPACE VECTOR MODULATION(SVM) for BLDC motor

I want to run a 4 pole bldc motor(12V) using SVM in open loop. microcontroller: Infineon IDE: Keil Microvision. I have successfully generated the Space vector which starts rotating as shown in the ...
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256 views

How can I do quicker sensorless FOC startup?

In my current implementation of sensorless foc startup I run the motor open loop using a constant current for a preset time and then try to close the loop. Currently I'm able to do this within 400ms ...
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58 views

Converting a 24v bldc to 12v

So I have been designing a brushless motor and the circuit that drives it is based off of this Texas Instruments one here. The only problem is that this circuit runs off a minimum of 24v. I would like ...
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328 views

Stuttering of Gimbal Brushless DC Motor

I am trying make a Gimbal BLDC motor spin slowly (~0.2Hz). For some reason I have problems with the motor stuttering, as shown in this video. At the end of the video I also show PWM signal from the ...
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182 views

BLDC Motor and Generator, query about capacitor bank

I have 3 phase generator (believe to be Wye) which goes to 6 diode rectifier, the rpm can goes from 1000 to 5000. The output of the rectifer (50V say) has ripple on top which goes to 100W Motor ...
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381 views

Controlling a 3 phase BLDC motor with an absolute magnetic encoder

I am working on a project where the motor controller needs to be rewritten because it's not behaving properly (the motor is vibrating too much and tuning its parameters is close to impossible). The ...
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1k views

A strange problem in BLDC motor drive: PWM frequency and duty cycle go wired

I am working on a BLDC motor controller to drive a 2kW BLDC motor with six-step control. The design has two board, one MCU board and one interver board, and the picture below shows one phase drive ...
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146 views

When do you use a brushless motor driver and when do you use an ESC?

I'm trying to build a drone from scratch on my ARM microntroller on a Tiva C series development board. I know you need a motor driver(controller) to control a motor, but in the case of a brushless ...
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633 views

A Simple way of Loading a BLDC Motor?

I am looking for loading a 15W BLDC motor with another BLDC machine, sort of like a master slave configuration. I'm not exactly sure how the slave BLDC machine windings should be connected. One idea ...
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677 views

Stepper motor to replace brushed DC motor to be used to start a gas engine?

I'm trying to decide if it would be possible to use a stepper motor to replace a current 12V DC brushed motor that is used to turn over a small (~149cc) gas engine for starting. The reason why is, I ...
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630 views

BLDC motor control PCB

I am trying to make a PCB to control a Sensorless Brushless motor. I just wanted to know if it looks right. The IC I am using is a TB6588FG it has a 2.5A peak output current. I want to use it with ...
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473 views

BLDC zero-cross issue

I am trying to develop a BLDC motor ESC (electronic speed control) for motors in water. This means that the motors will be subject to more load (due to the water). I am going for the sensor less ...
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64 views

How to understand voltage change between different phases of BLDC?

Actually, it is a question about an application note of BLDC from here. (on page 30 of that material) The question is about calculation of potential of M. What I learned from book is that the ...
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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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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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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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74 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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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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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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58 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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125 views

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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39 views

BLDC hoverboard motor with no specifications

I have this kind of motor but I can not find any electrical specifications about it. All I know is that is a 36V,250W BLDC motor. How can I determine the number of poles, the coil resistance/...
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110 views

Formula for RPM and its relation with slot stator

I want to clarify a formula regarding RPM. The formula \$\mathrm{RPM} = 120f/p\$ where \$f\$= frequency and \$p\$= # of poles. But what if the motor has different slots, for example, a 24 slot stator ...
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53 views

Identification of BLDC Motor

I would to know if make sense to obtain the current of the BLDC motor, using the BLDC motor torque measurement. In particular, i'm able to measure the torque of a BLDC motor but not the current that ...
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69 views

BLDC hall sensor output problem

The Hall sensor output is weird. First, I use 5V power supply connected to the Hall sensor power cable. Then, the outputs give me three high levels. Whatever how I rotate the motor, the output does ...
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80 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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315 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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107 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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43 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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560 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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58 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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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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76 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 ...