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 braking with BLDC and buck converter
I am working on an electric vehicle as a personal side project (a couch) and it is driven by 4 BLDC hoverboard motors and using aftermarket 3 Phase Motor Controllers. The couch is powered by a 2P6S ...
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Reverse engineering of Mercedes S-Class rear seat fans: how to make them work?
I'm new here, so I apologize in advance if I'm not clear. I'll do my best to clarify your questions as soon as possible.
For a professional project, my team and I purchased the rear seats of a ...
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How do I select MOSFETs for a 3-Phase Motor Driver DRV8302 Application
This is my schemaics (Design in accordance to DRV8302 Application note guidelines).
How do I select MOSFET specs for this design? How do I determine what range of Vgs, Id, Qg, etc I need for this ...
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3 'Phase' BLDC Motor Control using Raspberry Pi 5
I am making a project to control speed and position of multiple 3 Phase BLDC Motors using a Raspberry Pi 5. I am struggling with the number of PWM channels I will need and the lack thereof on the Pi ...
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Torque calculations in AC motor
I am studying the theory of brushless electric motors and do not understand how to calculate the torque delivered by a motor.
Let's assume a PMSM brushless motor using a FOC.
I found these two ...
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Logic for the motor stuck fault
I am controlling the BLDC motor using Foc hall sensor, recently damaged the hardware by not incorporating sufficient safety logics. One i want to incorporate is the Motor stuck fault, the current ...
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How to add a trigger-point to a thermistor/mosfet fan control circuit
This is more of a conceptual question from a non-EE about how to add a minimum-voltage trigger-point to a thermistor/mosfet fan-control circuit. I have been toying around with a thermistor circuit for ...
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Measurement of resistance of BLDC motor
I am using a hub motor around 800W and want to measure the resistance of the motor, but do not have the milli ohm meter and also want to understand if the below technique can work. It is 60V motor so ...
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Zero Electrical Degree of rotor in BLDC motors
After so much of reading different materials but most of the time getting confused with so much information, I assume I have arrived at an understanding of the zero electrical degrees in the BLDC ...
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Hall Sensor Output and Motor Back emf Relation
The following is the link of the document I am studying and trying to implement the trapezoidal control
TrapezoidalControl
but I am struck on understanding the Hall table
Please explain me how do I ...
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DIY BLDC motor makes buzzing sound when powered and refuses to turn
I have recently made a brushless motor. It has a 15 slot/20 poles configuration. I made the rotor from PETG and the stator from Iron filled PLA and I used 0.5 mm wire with 30 turns per tooth and 2 ...
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How does DIY BLDC driver work?
I saw this schematic for a simple DIY BLDC motor driver and I couldn't find any resources on the step by step process of how this circuit rotates a motor. I'm hoping I could find some answers here and ...
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Is there an inverse DC generator?
Consider the "force" and "flow" concepts of voltage & current vs. torque & speed.
With an ideal DC motor used as a generator and unloaded (open) terminals, the voltage is ...
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Close loop SPWM BLDC motor control
Is my intention to do SPWM on BLDC using 32bit MCU with 6PWM. To do this I will be using 512 point sine LTU. I already do this by just feeding the PWM outputs of the MCU and I'm able to move the BLDC ...
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4-pin DC Brushless Fan tachometer
I've been going through a few datasheets for 4-pin DC brushless fan with Pwm and Tachometer functions. I've attached one of them here for reference.
However I couldn't understand the tachometer part. ...
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PCB layers for motor driver board
I'm currently working on the PCB layout of my 3 phase motor drive unit. The circuit will be powered a 150V bus and output around 1kW power. Q1 to Q6 makes up the 3 phase inverter bridge. IC1, IC2 and ...
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Switching power supply failing in motor drive application, reverse power flow suspected
I've been driving a 24V robotics application with brushless motors, that I've measured to use about 2A usually, 5A peak as far as my slow multimeter shows.
Now I've exchanged the LiIon battery with 5A ...
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How to Use a BLDC Motor with VESC to Create Adjustable Resistance for a Stationary Bike?
I'm working on a project to convert a regular bicycle into a stationary exercise bike, and I'm exploring the possibility of using a BLDC motor controlled by a VESC to create resistance on the rear ...
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Motor Kv rating increasing or decreasing torque
I'm currently designing something that basically resembles a linear actuator. A BLDC motor that drives a threaded spindle and moves something. I have a fair amount of experience with brushless motors ...
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NPN transistor not turning on when applying PWM to its base?
I am trying to spin a BLDC using discrete components with an STM32F030C8T6 and using its TIM1 to control the high and low sides. High and low sides are controlled by NPN transistors that each control ...
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Stepper motor spins even when calculated back-EMF exceeds supply voltage - why?
I have bipolar stepper motor of following specs: 12 V, 0.5 A, 0.43 Nm, 24 Ω, 36 mH.
Back-EMF value is 0.0637 Vrms/RPM, measured by spinning it with power tool and measuring open coil voltage on scope:
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BLDC Motor Parameters to consider
I am building a waiter robot (if you don't know the term they are robot which can be used inside cafe or restaurant to deliver food or coffee).
I want to use a BLDC motor as they are quite and ...
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Small Brushed DC Motor Replacement
I need help to find a replacement for a small brushed DC motor. It is the traction motor of a pool cleaning robot (Zodiac Tornax OT3200). I assume that the carbon brushes of the motor are worn out, I ...
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Short terminals of back driven BLDC motor?
I have a Maxon BLDC motor with a 250 times gearbox in front. When powered off the user can back drive the system. This motor is connected to a Maxon EPOS4. When the user spins the output shaft fast ...
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Designing a Braking Circuit for a BLDC Motor
I have a project that requires controlling a BLDC motor with quick stops. The problem is that when the motor makes a hard stop from a high RPM, the power supply shuts off. It seems the back-EMF ...
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Advice on designing control circuits to drive brushed DC motor
I have two pin connector which consists of +50V and ground. Depending on scenario, +50V and ground will be swapped which is controlled by external circuits. So I only see either -50V or 50V. My ...
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Formula for Inductor Charge and PWM Duty Relationship
I am running some tests on a wye wound BLDC to understand the relationship between duty cycle and charge for a given PWM period. I am slowly linearly increasing the duty cycle off just one phase. ...
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How to suppress the back EMF in DDSM115?
I am working on a project which uses DDSM115 BLDC motor. When I rotate the motor (its a wheel, hence when I manually push the device) it injects a power back to my ...
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Is this BLDC single phase current correct?
I am designing a BLDC motor controller board, up to 40V and 30A. It seems like it is working at least pretty well, the motor I am driving is spinning pretty smoothly. I measured the current of a ...
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BLDC Motor won't start
I am designing a custom ESC for a quadcopter. I am basing my design on a STEVAL-002V1 evaluation board. I tried the motor I am planning on using on the evaluation board and it works fine. However it ...
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How can I prevent relay arcing when reversing a DC brush motor?
I'm fairly new to electronics and working on a project that uses a 25A 30VDC DPDT relay to reverse the polarity of a brushed DC motor (powered by a 24V battery). The relay has been failing by arcing ...
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Why must a brushless motor's stator have gear-shaped teeth instead of stacked iron rings with spaced copper wire?
In a BLDC motor the stator always looks like a gear and the coil always is wrapped around each gear like this:
I'm assuming it will be less efficient to do it like this because nobody is making BLDC ...
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Is it possible for my BLDC motor to run slower?
I have this BLDC hub wheel motor:
https://www.alibaba.com/product-detail/Low-Speed-Big-Torque-500W-13_1601107514377.html?spm=a2756.trade-carp.valid-supplier.3.2a913192a4Sp7y
Which I control with this ...
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BLDC Winding Confusion: Same or Alternate Direction for 12N16P Star Motor?
I’m building a 12-slot, 16-pole (12N16P) brushless DC motor with a star winding configuration and plan to drive it using a typical sensorless ESC. I’m unsure whether all stator coils should be wound ...
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Noisy BLDC Motor Control
I have been having some issues integrating a new motor controller with an Axial Flux Brushless PM Motor. Our new motor controller has three modes of operation 6-step, vector control, and sensorless. ...
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DC motor with propeller power consumption
I've tried to perform propeller and motor matching technique as described here or here. I've already selected proper propeller APC E 11x7 and gathered data from UIUC data base and also chosen motor T-...
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Not understanding LOW side current sense
I wish to implement FOC control.
I have a custom board designed by another friend of mine. But this is the first time he did this job.
There are 3 opamps connected in LOW-Side style on the inverter. ...
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DC Motor Controller
I am out of my depth trying to reduce the pump rate of my solar water pump. Not sure if a brushless or brush controller is required to reduce pump rate by 75%.
Here is my pump. Rocksolar brand.
24V ...
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Transients at an ESC powered with 12VDC over long wires
Suppose that we are forced by dumb requirements to supply low-voltage DC power over long (25m) wires to an ESC and its brushless DC motor (I know this is bad practice). The supply wiring inductance ...
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Is this a brushed or brushless dc motor?
I bought some 3-12 volt dc motors off of Amazon, and it doesn’t specify whether they are brushed or unbrushed.I tried looking up pictures and comparing the two, but kept getting different results. I ...
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Calculating phase current in BLDC (PMSM) motor
I am designing an ESC for BLDC motors for learning purposes. For the dimensioning of the MOSFETs, I want to calculate the RMS phase current so I can calculate the switching losses of each FET.
The ...
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BLDC Inverter MOSFET Failure at Startup – High-Side MOSFET Stuck On
I am working on a BLDC motor inverter circuit that occasionally experiences MOSFET failure (blasting) during startup. The inverter generally works fine, but continuous on/off testing revealed an issue ...
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9V battery draining very quickly because of servo motors or 11.1V Lipo battery in Arduino project
I want to control three servo motors and two BLDC motors using an Arduino and an HC-05 Bluetooth module.
Using a 9V battery to power the Arduino.
Connected Arduino's 5v output to Vcc of the HC-05
...
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Do RC ESCs use Six Step Squarewave or Six Step PWM control?
I'm trying to understand the differences between the hardware of a simple RC ESC, like the ESC described here, vs the hardware of a motor controller that implements FOC + SVM. This has started with me ...
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How to Estimate BLDC Motor Parameters (Resistance, Inductance, Inertia, Friction, etc.)?
I'm currently working on designing an inverter circuit for controlling a sensorless BLDC motor, and I need to estimate the motor parameters such as:
Phase resistance (R)
Phase inductance (L)
Rotor ...
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How to trigger ADC at a specific point during the ON period of PWM in STM32F303ZE?
I am currently working on sensorless PI control for a BLDC motor, and I am using the STM32F303ZE MCU for this project.
In sensorless BLDC motor control, the motor must transition to the next ...
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What prevents motors from creating mechanical energy with no energy loss?
I'm looking through dozens of direct-drive motors for a robotics project. I want to find the motor most efficient at converting electrical energy (to magnetic energy) to mechanical energy. The ...
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How do I determine the Kv for the BLDC generator
Correct me if I am wrong, motor velocity constant Kv can be used to calculate the RPM required to generate a certain voltage (eg. if Kv=1000 RPM/V, at 4000 RPM, 4V is generated.)
I have the RBM-4849T ...
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number of turns bldcm
I need to wind the wire of bldc motor according to the desired output parameters. So how to calculate the number of turns when I already have the stator and rotor dimensions? Is there a formula?
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Is this a voltage divider?
I am working on a BLDC motor driver and when I examine the bottom right of schematic, I've noticed that U_BEMF output is on end of R9 resistor. Are R8 and R9 forming a voltage divider? May they put ...
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