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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How do I integrate this MOSFET NOR logic gate with my circuit?
I have got an H bridge circuit controlled by a bridge driver (not in the schematic here). I want to control the disabling of it cutting of the conection to ground. I need the logic of a NOR gate but I ...
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How do I select the correct motors for my drone project? Suggestions? [closed]
I am currently working with my team of 3 on an autonomous quadrocopter, which can fly to an address selected by a user on a mobile using Deep Learning, GPS and sensors (LIDAR, Ultrasonic, ....).
The ...
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How is soft switching in a PMSM inverter achieved?
Recently I found some papers about PMSM drives that use the regular circuit of 6 e.g. IGBTs to drive a permanent magnet synchronous motor but with a resonant circuit in front of it to achieve zero ...
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BLDC motor is locking method to reduce the phase current
I'm using the BLDC motor rotating as a six-step commutation method. Now, I want to add the Anti-Theft method feature to lock the motor's rotation on both sides to change the wrong six-step commutation ...
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Why does a PCB with metallic Faceplate on a BLDC motor assembly creates a unit failure?
I am building a new BLDC stirrer unit which has metallic enclosures and a metallic faceplate for thermal dissipation. The unit fails often and would not run. I opened the unit to see if it was a loose ...
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Low side BLDC motor phase current measurement
I'm trying to design a current sense circuit for measuring a phase current in a BLDC motor. Here I'm using the embedded opamp in the STM32G4 MCU. What voltage will be at the output of the opamp here ? ...
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Tachometer for BLDC motors [closed]
Is there any DIY or electronic display kit available that can sense the electrical pulses on the phase wires of a sensorless BLDC motor to calculate the RPM?
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BLDC motor don't rotate through the C code flashed nor ST Pilot Motor unless I manually rotate it first
I'm using the nucleo-f302r8 + x-nucleo-ihm08m1 + a BLDC motor.
I'm trying to make the motor spin on the press of a push-button. I made a C code for it but unfortunately, my motor seems stuck when I ...
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Brushless DC Motor -> Generator Power
I would like to know the approximate Voltage I could produce if I used this motor as a generator... If anyone could help me out with this I would greatly appreciate it!
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Use nickel as a flux ring
I'm designing an outrunner for a specific application. Rather than use steel to hold the magnets in the flux ring, can pure nickel be used? Nickel is a magnetic material, but has decent oxidation ...
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DC motor design without brushed or electronic commutation [closed]
When applying DC voltage to the coils, will this motor exhibit torque?
Rotor is comprised of 24 iron blocks which pass through two stationary copper coils. The flow of current within the coils is ...
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Drone motor specifications
I came across a video where e bike is powered by a drone motor.
https://youtu.be/P5uUyUWpP_I?si=EbKb5CHgOntANXcf
I totally understand that it's possible via using appropriate gear ratios to convert ...
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Measure Delta wound BLDC motor inductance and resistance
I'm using a VESC motor ESC to drive several different motors. When I connect a new motor, it has the ability to detect the motor parameters, but somehow gets it wrong for some of the larger motors: ...
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Only using low side of high/low mosfet driver - can I leave the high pins disconnected?
I have the below circuit for a high/low mosfet driver half bridge, with an extra low side for running a brake resistor (note this is just one of the 3 half bridges for the BLDC controller)
I'm using ...
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How to find the back-EMF constant of BLDC motor from a motor technical data?
I have a BLDC motor with these info (please don't pay attention to the striped column):
How from these info, how can I get the Back-emf constant ? Is it just 36V/4krpm = 9 V/krpm ?
Thank you a lot.
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How to prevent regenerative power from destroying my DC motor controller
I have a DC motor controller that clearly says to use a battery and not to run it from a power supply because of the likelyhood of the regenerative power damaging the controller.
Unfortunately, this ...
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Estimate DC current from phase current in BLDC motor
I am using a BLDC motor with sinusoidal windings that I drive with FOC. The implementation uses a triple half-bridge and a DRV83 to drive the MOSFETs. I have 3 low-side amplifiers to measure the phase ...
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Correct understanding of torque constant for BLDC using FOC
I have a BLDC motor with sinusoidal windings that I drive with FOC technique. With my recent knowledge earned by implementating FOC, I got confused with the typical motor constant given in ...
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DC Motor suddenly stalls when connected through SSR
I am trying to control a motor remotely by using a relay. The relay is rated for 5-60 V DC, 100 A. The motor is a brushless DC motor, rated for 48 V, 10 A continuous.
The relay switches on once the ...
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Sensored Brushless DC Motor Back EMF Problem
I am working on the current control of a BLDC motor with a speed of 12000rpm. The current controller in the system is designed as PI. I give a reference value of 10A to control the motor and the ...
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Help getting a BLDC motor with ESC working with my PS4 Controller
I'm a hobbyist and have been working on building a small ROV. I want to be able to control several DC motors independently so I went down to my local hobby store and they helped me chose a DC motor, ...
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Homemade BLDC controller not functioning (IR2101)
I’m trying to make a controller with 3 H bridges (N-FET, IR2101 and a Arduino Mega). I’m sure that the problem is in my code but I don’t know how to fix it. I think that the problem is in the PWM.The ...
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What is the mathematical relationship between motor velocity constant, Kv and temperature?
From textbook, it is stated that Kv = rpm/V. But how does Kv change with temperature mathematically?
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SVPWM lookup table
I tried to control the three-phase BLDC motor in the SVPWM method. I use the lookup table for SVPWM. The below one is from saddle waveform (3rd harmonic rejection) which contains 1/3rd period to zero (...
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What role does permanent magnet strength play in BLDC/PMSM performance?
It seems to me like stronger permanent magnets are preferred by motor designers, but my current understanding of what role they play in performance is fuzzy at best. I would assume that stronger ...
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How to calculate the values and ratings of wound Induction Motor Rotor Resistance Starter resistors?
How to calculate the values and ratings for the Rotor Resistance Starter resistors?
Motor specs:
3 Phase 400V
1/2Hp
4 Pole
1750rpm
Y connection
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Safer alternatives to Li-ion battery packs while experimentation/development
I am developing a quadcopter from scratch (mainly the flight controller part) and at times I need to connect the whole system to a power supply that can sustain high currents for testing. I have the ...
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Configuring Overcurrent Protection – ST Microelectronics Motor Control Workbench
I have been working on a custom electronic speed controller I designed and built partly based on a reference design from ST Microelectonics; the STEVAL-ESC001V1.
My board uses the same MCU, a ...
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Is this design to control a BLDC with 1 PWM signal feasible?
I've started designing my own BLDC speed controller for a RC Car. I've been reading this document from Microchip where they use 6 seperate PWM signals from the MCU to drive the MOSFETs which, to me, ...
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Why does the supply voltage of a BLDC motor increase when speed is reduced?
I am new to BLDC motors. I am working on a project where I need to spin a BLDC motor from speeds of 10k to 40k RPM using sensorless back EMF as speed feedback.
The application requires changing the ...
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Park transform, why do we use the electric angle and not the mechanical angle?
In the control of a motor with a multi pole-pair permanent magnet rotor the Park transform is done (if I am correct) using the electrical angle, and not the mechanical angle.
If we use the motor as a ...
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Sinusoidal Current in a Saddle PWM BLDC Motor
I have learned that many BLAC motors have a saddle-shaped phase voltage. Apparently, this can improve efficiency while still retaining the sinusoidal line-line waveform. One reference for this is here:...
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How do I calculate the current used by a BLDC motor under a load?
I am working on a robotics project where we are currently designing a battery. This battery is specific for a motor driver and two BLDC motors. I would like to know how much current will be drawn from ...
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Torque control of a BLDC motor
Please forgive my lack of perfect electronics knowledge. I am here to learn.
I understand I am clearly missing and misunderstanding something important. The aim of this question is to find out what it ...
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select the proper HALF-BRIDGE DRIVER for DC motor application
I was looking for a HALF-BRIDGE DRIVER for my H-bridge and BLDC motor projects, however, I found most of the MOSFET gate drivers are two types
One has SD (Logic input for shutdown) and IN (Logic input ...
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Motor Constants - Formulas
I have some problems verifying the motor constants in the table below.
From my knowledge, the following formula holds between the torque constant
and the BEMF constant:
Now, in the datasheet mostly ...
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Feedback of the smart gate drivers
I have seen a smart gate driver DRV8353RH being used with a three phase motor. There are also input feedback pins to the gate driver that senses the voltages and this could be used to do speed ...
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BLDC motor - how do I find out which phase should be positive and which negative?
In this picture the current is either positive, negative or float for the phases. I am confused and can’t figure out which needs to be fed what, for my motor to go the direction I want.
Source: https:/...
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How to reverse the polarity of a DC brushless hobby motor?
How can I reverse a motor safely that draws about 70 A on 4 s (14.8 V), and additionally how do ESCs (Electronic Speed Controller) that have this capability built into them do it?
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Relation of KV to speed in BLDC motors
The KV parameter determines the angular velocity of a motor for some voltage. I can't wrap my head around how the same supply voltage can result in different angular velocities if (I'm also unsure ...
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BLDC motor with a common enabled configuration
Can a BLDC motor be driven with a common enable configuration? To be more precise, without the possibility to leave a phase of the motor floating. Every phase must either be connected to Vcc or to GND....
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STM32 STEVAL-Spin3202 Motor control - Issues with driving power MOSFETs with PWM
I've been struggling with my new STEVAL-Spin3202 board from STM. It is using the STSpin32F0a motor driver with STM32F031C6 MCU. The ultimate goal is to control a BLDC motor with six-step sensor-less ...
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BLDC hall sensor output to pulses
I want to combine the output of the three phases of the hall sensor output to generate a pulse for any change in the output of the hall sensor. Can someone suggest a circuit implementation to achieve ...
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Unable to vary speed for a 2 wire BLDC motor
I have a 2 wire BLDC motor (UNMS 020KPDC-B), when I hook up directly to the voltage supply and vary the range between 2.7V and 6V, the speed changes. I purchased a TB6612FNG kit and hooked it up to ...
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Motor constants and motor poles
From what I read, if I'm dealing with a BLDC motor, the torque constant \$ K_t \$ and the back-EMF constant \$ K_e \$ are, numerically, the same (using SI units).
However, if the motor has a big ...
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Can anyone explain electrical and mechanical angle of BLDC motor?
If a 3 phase 6 pole BLDC motor is 120 degree trapezoidal/block commutated and 6 switching sequense is required.
How do you calculate the electrical degree per pole and mechanical degree?
How many ...
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simplest way implement ESC circuit for drone?
I'm designing a fun little quadcopter PCB based around the RP2040 chip and am interested to incorporate the ESCs in my design, all on one board. They don't need to be too fancy in terms of features ...
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Finding BLDC motor amperage and needed battery power
Im currently trying to build a motorized sofa chair. Physical things such as structure is of no issue to me, however the issue comes with finding motors and batteries that will work together and not ...
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CAN communication in dsPIC33CK64MP508
I tried to transmit data using CAN communication in dsPIC33CK64MP508. I use MCC for configuring CAN in dsPIC33CK64MP508. I set the bit rate to 500 kbps. I just transmit two data bytes (0x41 and 0x42) ...
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Actuator using a BLDC motor simulation
I need to represent an actuator which is using a BLDC motor in Simulink, for my Bachelor's Degree. I don't specialize in electrical engineering, but in mechanical engineering, so I'm at a loss here.
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