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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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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51 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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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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74 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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23 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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40 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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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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41 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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69 views

How to control 4 motors which are conected to a flight controller using Raspberry Pi?

I just started a project to make a drone without a radio controller. I want to control 4 brushless motors connected to a flight controller KK 2.1.5 using Rpi 3 B+. Obviously, the motors are first ...
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124 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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55 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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72 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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86 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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356 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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116 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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94 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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44 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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81 views

How to identify phases of BLDC motor without rotating?

I picked up a Wye-wound brushless DC motor with three leads, three wires coming out of it via a flex PCB. Unfortunately, this flex PCB has no color indication. How can I figure out which lead is ...
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104 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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116 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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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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585 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
407 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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62 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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77 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 ...
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75 views

Waterproof PCB pump driving stage

We are having issues with a small 12V DC pump which is used in a number of test systems in the field. The pump is powered by a standard DC power supply and integrates a small PCB driving stage, with ...
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81 views

3phase bldc motor (IPM)

I just want to ask regarding of the 3 phase BLDC motor IC driver which I use is APX9370, when I build the circuit it seems there's no switching happening in the 3 phase out put of the IC, its like ...
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57 views

Why not detecting zero crossing of the back EMFs in BLDC by software?

I am reading about the state-of-the-art approaches to detect the zero crossing of the back (trapezoidal) EMFs on a 3-phase BLDC for sensorless control. Even digitally implemented, they use various ...
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191 views

BLDC phase voltage wave form

I am measuring the phase voltage of a BLDC motor as shown in the figure below. As the motor doesn't have neutral point, a virtual neutral point(VN) is created by the resistor network and three-phase ...
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1k views

Controlling Gimbal Motor (Brushless 3 phase) with Arduino

I was able to "successfully" wire and code a 3-phase brushless motor using an Arduino. Using the library (and thus PMW), 20A esc, and a potentiometer I am able to get the motor to spin. However, ...
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259 views

Relationship between brushless coil inductance and back EMF as a function of phase angle

In general, does the inductance across the coils of a brushless motor have the same waveform as the back EMF? That is, if back EMF is sinusoidal, should I expect the inductance to be sinusoidal [with ...
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227 views

BEMF polarity is backwards

Please take a look at this waveform of a 3 phase, BLDC motor: Check out that rising and THEN falling slope...Pretty nice. Now, take a look at what I'm getting on my motors sensorless resistor ...
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327 views

FOC current control autotuning PI Controller for BLDC Motors

I try to understand, how the guys from odrive tuned the current control PI parameters for Field Oriented Control: https://github.com/madcowswe/ODrive/blob/master/Firmware/MotorControl/low_level.c In ...
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123 views

High side current sensing in BLDC motor?

I want to measure DC current flow through the 48 V battery in bldc motor (through Inverter circuit). Are INA 282, INA 169 work properly or not? Since my battery motor specification is 48 V, 5 Amp, 250 ...
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79 views

Using a 670Kv outrunner motor, how can I calculate a way to get variable low speed and high torque?

I have an E-flite Power 46, 670Kv outrunner motor (Kv is the shorthand for RPM/volts, it has 3.9A idle current, 40A maximum continuous current, 14.4-19.2 voltage range, 925 watt maximum) but I wish to ...
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139 views

Overcoming cogging/ripple torque in gimbal motor

So I'm trying to figure out how to spin a camera on a brushless gimbal motor. I am feeding each of the terminals a sinusoidal pwm signal from a via 3 half bridges on the SN754410. Each of the pwm ...
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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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339 views

Bldc hub motor starting torque

am designing a BLDC hub motor (48V-500W-15A max) I have designed a three phase inverter and the motor run normally with smooth rotation and as the motor start running and I apply the load the motor ...
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121 views

What's the best starting point for rotor angle estimation for FOC?

I'm driving a BLDC motor with FOC. Right now, I have Space Vector modulation working, where I can give it a magnitude and an angle, and the algorithm will drop the right values into three PWM ...
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302 views

What happens to inverter if running motor controller without load (motor)?

Consider running a 3 phase BLDC motor controller having 20KW inverter fed by 100V whence designed for high amperage. What happens if we turn it on and start gradually increasing duty cycle of the ...
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58 views

What to do with PI feedback value

I've been studying and trying to implement a PI feedback controller for a BLDC. Right now, just to unit test the code for the PI controller, I'm driving two phases with a PWM signal on a MOSFET ...
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2answers
279 views

Rectifiers in parallel - mosfet

I see the question has been asked a few times about using rectifiers in parallel to get a higher current rating and this is not advisable however I wanted to ask how this would apply to a active ...
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1answer
329 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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426 views

How does line impedance of a BLDC motor relate to the RPM of its rotor?

I am curious about the impedance of the three phase BLDC motor when it is in operation. If the speed of the rotor of a BLDC motor is proportional to the frequency of the three phase current, and the ...
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727 views

BLDC torque control using arduino and a motor controller

I am trying to remote control a BLDC using Arduino and a motor controller by controlling it's torque. The process would be like this: The user moves the stick on the remote controller, the Arduino ...
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351 views

3 phase BLDC sinusoidal drive using PWM controller and/or DSP?

My background is mechanical engineering (robotics). I apologize in advance. I have a sensitive torque ripple (Vibrations) application and would like to use sinusoidal drive to run a 3 phase BLDC ...
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610 views

Sensored BLDC Motor from Hoverboard - Protect driver?

I'm designing a controller and Arduino library for a brushless DC motor, which was used in a Hoverboard. Its specs are 36V, 200W. I use the standard circuit that is suggested everywhere on the ...
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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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418 views

Bldc esc circuit drawing high current on one side

Hi stackexchange community, We are trying to drive a bldc motor which we dont know any information about. I have previously asked a question about getting more info since we dont have any datasheet. ...