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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1answer
23 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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35 views

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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120 views

BLDC Motor Drive control

I am using a 310VDC, 4pole BLDC motor with hall sensor feedback for my application. My objective is to run the BLDC motor at 7500 rpm. My motor rated speed is 8500rpm. I am able to run motor at ...
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1answer
35 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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43 views

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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What type of motor is the best in cost-benefit ratio if I want to make an electric standing desk for mass production? [closed]

I have bought linear actuators, But I think they are very expensive, right? And I would like to know if other types of motors are more suitable for me in terms of cost-benefit-price-quality to create ...
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3answers
58 views

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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32 views

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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Higher KV means lower torque for DC motors?

I'm in the process of trying to build an electric skateboard. On the websites I visited I read that torque and KV are inversely proportional which does seem counter intuitive. So I'm wondering why ...
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run bldc motor with arduino and l298 driver

I am trying to learn controlling BLDC motors without using an ESC, but using Arduino and a driver, instead. At home I found an old DVD driver and took out the motor, which was Nidec Slim 24C, http://...
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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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120 views

How to determine brushless DC (BLDC) winding pattern, based on poles and slots?

I am trying to figure out how to determine the correct winding pattern for a 3-phase BLDC motor, given that there are 10 poles and 18 slots. I have seen the very interesting post here., but as the 10-...
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1answer
350 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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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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1answer
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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1answer
192 views

For Brushless DC Motors would one expect harmonics to be different between Delta and Y stator windings?

Given two 3-phase brushless DC motors with the only difference being that one is wound delta, the other Y with center grounded, would I expect to see high frequency voltage-current harmonics to be ...
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316 views

Maintaining fixed shaft position of BLDC/PMSM

I intend to control the position and speed of a BLDC motor (still to be selected) using field oriented control (FOC) and an Encoder to determine shaft position and speed. From what I understand from ...
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1answer
287 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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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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3answers
295 views

Mosfet Driver - High Side Output Problem

I've been trying to make a 3 phase inverter to drive a BLDC motor. Mosfets : IRF3205 Driver : IR2101 Supply voltage for FETs and drivers : 12V BLDC : https://media.digikey.com/pdf/Data%20Sheets/...
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1answer
206 views

BLDC controller

I have to design a controller for three phase BLDC motor. In BLDC motor, for each hall sensor signal combination we have to to energize two sets of stator phases. But how to correctly identify which ...
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5answers
194 views

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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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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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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2answers
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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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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39 views

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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2answers
85 views

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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2answers
67 views

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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2answers
84 views

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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52 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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39 views

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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3answers
52 views

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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1answer
265 views

Tuning PID coefficients for stationary stability of brushless DC motors

I'm using a commercial off-the-shelf brushless DC motor controller. It combines a PID controller and an absolute encoder to regulate position. When my motor reaches its target state, it generates a ...
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1answer
130 views

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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1answer
43 views

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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1answer
64 views

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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55 views

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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1answer
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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1answer
496 views

Protect battery from overvoltage - DC brushless motor overspeeding condition

I'm trying to figure how to protect batteries from overvoltage on my electric skate. Specific condition is : motor would run above max RPM based on system voltage. Motor is 85Kv, battery voltage is ...
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1answer
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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1answer
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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1answer
774 views

High side RC ESC switch

I've been designing a test bench for RC propulsion systems and for that I thought it would be nice to be able to switch the power to the ESC on/off. For this I designed a simple circuit which I ...
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1answer
458 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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3answers
156 views

BLDC motor current sensing for load torque

I would like to control 14V BLDC motor of battery powered drill. What I want to do remake the drill to nut runner (torque wrench), so I need to sense a motor current which is proportional to motor ...
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1answer
26 views

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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2answers
45 views

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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