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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18 views

BLDC Motors: Calculating the offset between rotor flux angle and rotary encoder Measurement

I am using an AS5147 Rotary Sensor to measure the position of a BLDC Motor. The motor is a 11 pole BLDC/PMSM. I have my own inverter circuit and right now doing a look up table based Space Vector PWM ...
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Which generates more heat in a brushless motor winding's: 36V @100% duty cycle or 48V @75% and how significant is it?

Are the heat losses (in the windings) equivalent for a 36V brushless motor driven by 36V at 100% duty cycle compared to 48V at 75%? While my limited knowledge suggests since the same total power is ...
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ESC isn't starting the motor [closed]

I bought a cheapest 30A ESC for 2200KV brushless motor, connected it (for sure i connected it properly, i've checked 10 times) and for the first time i heard some beeping and then motor started for a ...
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42 views

Building E-Bike system [closed]

I have a very simple question, I want to learn how to build E-bike (Battery / Controller / BLDC) I want to understand first the system model and what's needed to be learned to build one. I searched ...
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Brushless DC motor - number of hall sensors

When we have hall sensors inside a BLDC to use as encoders for the processor, I saw some diagrams on web showing 3 output signals (open collector outputs, need external pull-ups to the VCC of ...
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39 views

Power System Design for BLDC control - why not use a DC/DC convertor?

So I have experienced the usage of a BLDC motor to spin a propeller. The electrical design ensured the bus voltage was such as to bring the motor to a good operating regime given the Kv, etc. However, ...
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How can a BLDC motor respond to a specific dynamic load demand without changing the supply voltage? [duplicate]

Coming at BLDC motors from the theory side, my understanding has always been that they have a linear curve based on Kv, no-load current, and resistance, for a given applied voltage. Now the thing is, ...
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Driving a BLDC motor, having three switches on at the same time

I am currently working on a 14p BLDC motor and I wanted to drive it using 180 degree commutation (having 3 switches on at the time instead of 2). How can this be achieved? how can I know the correct ...
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36 views

Garage door openers - BLDC x AC monophasic - Is that possible?

As far as I know, electronic control boards for garage doors, they basically control two main types of motors: AC induction monophasic, one neutral and two phases, driven by TRIAC or relay. It takes ...
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BLDC - Single motor for a range of voltage supply with PWM

I plan to use a BLDC motor of around 1/3 hp supplied by a DC rail that is generated from AC mains. If the AC voltage is from 100 to 250Vac, I would have a rectified DC supply of from 141Vdc to 352Vdc. ...
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Pull away voltage (energy) from a DC motor driver board when it does regenerative braking

I have 200 BLDC motor (six-step) driver boards. They work fairly well but, when I tested them on a heavy load (2500 kg), I discovered that they struggle when braking the motor. The PID algorithm can ...
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Shoot through problem in 3-phase BLDC controller circuit

I have designed a 3-phase controller for a BLDC motor. I am checking one side of the bridge with a Pico-scope for shoot through. The wave-forms below are indicating that i am getting shoot through, ...
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Electric skateboard ESC and homemade battery pack

I am building an electric skateboard and it requires an 80A ESC and 22.2V Li-po battery to run. I found a video where a guy connected a bunch of 18650 Lithium Ion cells in series to form an equivalent ...
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How does a 5,000 watt hub motor differ from a 4,000 watt hub motor (Both BLDCs), when powered by a 72V 100Ah Lithium ion battery?

I'm trying to design a motorcycle conversion kit for an underprivileged population in a rural area. I'm currently looking at potential hub motors to be powered by my selected battery (as mentioned in ...
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43 views

Help Identify Potential BLDC Protection Circuit

I am trying to determine the function of a small circuit on a separate PCB that feeds a more complex Brushless DC Motor PCB. As far as I can tell (from physically measuring between 9V-24V) the output ...
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Is the viscous friction coefficient of a BLDC motor dependent on the system inertia? [migrated]

I have to model the required torque to move a system composed of several mechanical parts such that this system performs a motion profile. It is a Maxon drive composed of an ECX Speed 16L BLDC micro-...
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44 views

Analog differential signaling

I'm a software engineer that sometimes has to deal with some electronics. So I'm by no means an expert... I want to control a BLDC motor and I have added a thermistor to the windings of the motor so ...
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1answer
68 views

How to automatically reverse the direction of a motor without human intervention?

I am working on this project where I have an arm at rest want a brushless DC motor (BLDC) to automatically reverse: (I've added an image and text above for a visual reference) Given that I am taking ...
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24 views

What design considerations need to be made to accurately measure current flowing through a BLDC motor due to a 20khz PWM control?

My early attempts to incorporate current sensing onboard a BLDC motor drive operating at 20khz involved the MAX40201FAUA differential amplifier (50V/V) IC and a 0.001ohm shunt resistor. Results were, ...
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1answer
45 views

Do BLDC motors have saliency similar to IPMSMs?

I am experimenting with an outrunner BLDC motor, which is a Gaui GUEC GM410. It is a 12N14P motor and it has sinusoidal bEMF. If my assumption is corrent, it can be considered to be a SMPMSM with no ...
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Power recirculation rig using rectifiers and BLDC motors

I am currently trying to set up a rig to test my 3d printed gears under different torques and motor speeds. The power input side is going to be the BLDC motor, driven by a hobby ESC (BLHeli_32), ...
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Unsure of PWM frequency for HobbyWing Platinum-60A Brushless ESC

I want to program this ESC HobbyWing Platinum-60A Brushless ESC (Manual) I want to first try it using Arduino's Servo Library and then using STM32F4. From its manual: It says that it requires PWM ...
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Brake vs Coast in BLDC

I'm using Brushless DC Motor. what is the difference between Coast and rake in Brushless DC motors ? application of each ? and if there is consideration of motor speed when choosing one of them? If I ...
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What is the result of deviating from the Kelvin layout when designing a current sensing PCB?

For a two terminal current sensing shunt resistor with a layout that deviates from the symmetric Kelvin layout, what results should be expected? For example, with this layout, what result would be ...
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What is the best way to solder a large flat SMD shunt resistor so as to minimize joint resistance?

I have a BLDC motor controller that uses a high side 0.001 ohm current sense resistor (CSS2H-5930K-1L00F) and a MAX40201FAUA (50 V/V) to measure the current during motor operation via a Teensy 3.6 ADC....
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57 views

How does HFI (high frequency injection) work with BLDC motors

How does HFI work with BLDC motors. In this video: VESC HFI: Sensorless position tracking at zero speed he explains how HFI works, however i don't get how it can work with motors that have trapezoid ...
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Help with figuring out the particular requirements of this circuit

Sorry for if i say anything incorrect I am trying to create a circuit that can control a BLDC. motor ...quite simple and easy but i want the source of power to be switchable/interchangeable ......
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Varying Speed of Brushless Motor Within The Same Cycle

Is it possible to vary the speed of rotation of brushless motor in its driver within the same cycle of rotation? I read that BLDC drivers use sinusoidal waves to drive the motor, would it be possible ...
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Why are two PID controllers needed for FOC (Field Oriented Control)?

I've been looking at code to do FOC and noticed that two PID controllers are usually used for torque control -- one that keeps Id near zero and another that maximises Iq. I understand why Id should ...
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How do you control voltage to a BLDC motor?

I'm new at this and all but, how do you control the voltage going to an electrical BLDC motor? I want to control the voltage going to a motor on a dial that goes from 0-100% Thanks
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Difference between SVM and sinusoidal PWM in BLDC

In this answer Answer to question regarding difference between 6-step and FOC, the author said: "Likewise if you have gone to the effort to implement a FOC you might as well implement a SVM block to ...
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STM32 - Fastest way to change ADC channels after each conversion

I'm using the STSPIN32F0 (edit: I'm using the STPIN32F0 6-step control evaluation board from ST called STEVAL-SPIN3202) to develop a 6-step speed controller for brushless DC motors. The STSPIN has an ...
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making solder stick to the tip of a brushless motor

I have a brushless motor like this and want to attach some sort of steel bar like a needle to it. I am currently using superglue, however even after using a lot it still makes the bar come of rather ...
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51 views

Electric Motor-drive type/setup recommendations needed. I need 90,000 rpm at the output shaft @ a power of 30kW.? [closed]

I am repurposing a car turbocharger to be driven by electric motor. It requires around 30kW, @90,000 rpm to function in the desired range. Which type of motor should I use? I'd probably have to use a ...
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43 views

Electric scooter

my daughter has trouble depressing the switch on the board to make the scooter go, is there anyway I can wire a throttle to this controller, I can't find the wireing diagram for it so I'm stuck, any ...
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73 views

BLDC CW/CCW rotation issue

I wrote the post with BLDC delta winding commutation sequence, and to this day a believe the findings are true. But i have an issue that is occurring only in CCW rotation, at about 97% up to 100% ...
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Brushless motor and voltage characteristics

In order to choose a small motor for a size constrained design, I have been looking at Faulhaber https://www.faulhaber.com/fr/produits/series/3216bxtr/ motors. They always offer different models with ...
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Motor choice for a quadcopter, DC coreless or BLDC?

Ok, I am planning to build a quadcopter by myself. Almost anyone uses BLDCs with ESCs in the tutorials etc. I wonder why a BLDC is more preferable than a similar DC coreless motor. For example I found ...
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64 views

What are the standard PWM output signals that a microcontroller should generate for 3 phase motor control?

I am programming a FOC 3 phase motor controller on a Teensy4. The motor will be driven by 6 MOSFETs and a gate driver IC for the MOSFETs. I have looked though the data sheets for many different gate ...
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31 views

What electric setup do I need to get electricity from a BLDC motor?

I'm trying to create a small scale wind turbine for a project. I plan on using a BLDC motor with some blades on it to capture artificially created wind. I'm new to electronics, but I was thinking of ...
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BLDC delta winding commutation sequence

I have a question regarding commutation sequence in CW and CCW mode on a 3-phase BLDC motor with delta terminated winding and trapezoidal BEMF. Everywhere I read about this subject they only explain ...
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108 views

In BLDC sine commutation, why are the low and high of each phase inversions of each other?

In the diagrams that I have seen showing the PWM plots vs the sign wave of the high and low side fets for each phase of BLDC sine commutation, they are shown as being the inverse of each other: ...
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Help finding an appropriate driver for brushless motor

I have a 28mm wide dc motor in the device pictured here. I have removed the control board of the device and am looking to replace it with an external driver board with RC PWM inputs for control. The ...
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28 views

Accuracy in BLDC speed calculation

What is an accurate manner to calculate the rotational speed of a bldc motor using hall sensors and microcontroller units, considering both floating point operations and length of the observed period (...
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57 views

Modifying brushless alternator for external regulator

I'd like to modify a Delco Remy 38si or 40si brushless alternator for use with an external voltage regulator. For a brushed alternator, I'd just need to pull the field out external to the case. My ...
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26 views

Sanity check for max motor torque

A KDE brushless DC motor has: Kt = 0.0189 N*m/A (Kv = 505 rpm/V) R = 7 mΩ voltage range of about 30-60 VDC Specsheet link Assume the motor is connected to 30 VDC input ideal, sensored, six-step ...
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2answers
79 views

Why would a BLDC motor be “noisy” in reverse

I have a BLDC motor on a controller I built running in both forwards and reverse. However the reverse direction is substantially noisier than the other and the motor vibrates more almost as if the ...
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18 views

Error when Implementing field oriented control of a brushless DC motor

I am trying to simulate a bldc motor control system (controlling current) in Matlab/Simulink: So far, I have built the following blocks (already tested individually, and they have already worked well)...
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27 views

Locked Anti Phase PWM and BLDC makes sense?

Locked Anti Phase PWM is used to drive brushed DC Motors, but does it make sense to use it for a BLDC, e.g. 3 Phase Motor?

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