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
90 views

Why is a DC brushless fan always spinning in the same direction?

Computer type DC brushless fans integrates both a single phase DC motor and electronics to drive it (you only provide typically 12V or 24V and the thing rotates) There are only two MOS and one hall ...
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49 views

How a little extra current can affect a motor

I want to run a 12V, 19 watts DC motor. Which should use 1.5amp of current. Now, I have a 12v DC, 2 amp power supply adapter. How it will affect the motor in the long term. Will it burn the motor for ...
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BLDC controller PCB problem

I am designing a BLDC motor controller circuit on my own. My BLDC motor ( Chinese motor) is 1kw with a hall sensor and my own controller spec is 1kw,48v, and 30A. My controller circuit is working fine ...
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28 views

How to debug new Brushless DC motor not working?

I'm building an autonomous boat, for which I so far used this brushless motor powered by this drone ESC (both pictured above). I now want to start using a more efficient motor, so I bought the 12V ...
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Unusually clean 5 kHz noise from BLDC motor

The noise does seem to pulsate but I'm not sure how I'd go about measuring the beat frequency. I'm driving this thing with 2 L293D (works fine with just one, heats up a bit though,) and feeding a ...
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39 views

Raspberry Pi DC motor control with position feedback

I'm interested in controlling a DC motor using a Raspberry Pi and I want to know the approximate position of the motor. I have seen multiple ESC for sale but most don't appear to provide any feedback, ...
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2answers
40 views

How does the gap between coils and magnets affect BLDCs

I just came across the doubt about how the space between the stator and the rotor in Brushless DC motors affect their performance. Of course the further apart coils and magnets are, the least torque ...
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20 views

BLDC Transfer Function

How would one create a transfer function for a PWM-controlled BLDC motor? I'm building a controller model in Simulink, and while I've found several references for transfer functions for BLDC motors, ...
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35 views

DC Motor Efficiency at a given operating point

I'm trying to select a motor for a design application that cares mostly about efficiency. Given a required torque and RPM output from the motor, I feel like it should be possible to calculate the ...
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33 views

Bldc motor braking

Which type of braking is most suitable for bldc motor? Plugging or dynamic or degenerative braking. For motion control application.
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35 views

Relationship between torque and back-EMF voltage | BLDC motor modeling

I want to simulate an BLDC motor, so I am studying corresponding mathematical model. My problem is that I am little bit confused by the torque equation. \$e_a\$, \$e_b\$, \$e_c\$ - Back-EMF voltages (...
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Necessary Bandwidth of Current Shunt Amplifier in FOC + SVPWM motor control

I am designing a BLDC motor controller using sensorless FOC + SVPWM, planning to use a shunt to measure current, and using an observer to determine the rotor angle. I was wondering, what bandwidth do ...
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How do i know what resistor value, that's attached to a BLDC motor, i should use in order to get a torque of 100 lb-ft put on my actuator?

Motor P/N is M-3441Y-LN-02D. Back EMF [Ke] is 38.95 (Vpeak/Krpm). Continuous torque 2.495 lb-ft. User manual. I want to run the actuator coupled with the BLDC motor 60:1 gear ratio in reverse. So the ...
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Electric go kart [migrated]

I know this may be a physics question but, will a 48v 1000w motor with 3000 rpm be able to move a 500lbs go kart on a concrete sidewalk? And, can I use one 12v 101Ah 27A deep cycle marine battery with ...
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How to choose the MOSFETs for BLDC motor drive?

How to select the proper MOSFETs for Brushless DC motor drive circuit? The Motor will work at 22.2V max. voltage and 40A max. current.
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Six-step (trapezoidal) BLDC motor driving strategy

It seems that a common driving strategy for such a motor is to use the 3 half-bridge topology depicted above, and use PWM to regulate speed and/or torque. At any given moment, two phases ("wires&...
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78 views

How to calculate d-axis and q-axis inductance from line to line current?

I'm wondering how to calculate the d-axis and q-axis inductances for a BLDC motor given the line to line inductance L. My hunch is to use the Park and Clark transforms that are used for current, but I ...
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254 views

How to electrically brake a brushless motor

I'm sorry if this question is too stupid, unfortunately I have a very low experience with BLDC motors. I would like to use 4 x 350W, 24VDC brushless motor hubs for my wheeled robot (they are usually ...
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BLDC and Stepper motor torque ration meaning

Ok so after searching on the internet for a pretty long time there are a lot of undefined or roundabout articles about torque for both motors. Hybrid bipolar stepper motor torque. This one is a little ...
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28 views

BLDC motor, typical maximum isolation voltage in DC

For one of 1/3 or 1/2 hp, can I aply a instantaneous 400VDC on it together with PWM (of around 50-200hz), safely? Do commom BLDC motors cumply with that spec?
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Building an ultralight electric hoist, what gearbox reduction / motor combination for torque / power requirements? [migrated]

I am building an electric hoist. Design requirements: Lightweight Quiet Relatively low lifting requirements (100 kg) Relatively fast lifting speed (80 fpm -> .4 m/s) Low cost Simple Force ...
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27 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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38 views

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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43 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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29 views

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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42 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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44 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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19 views

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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41 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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44 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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60 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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35 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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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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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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69 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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46 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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68 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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86 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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85 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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80 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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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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196 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
44 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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142 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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