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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20 views

VDS Fault on A4964 BLDC motor Driver

I am actually designing a BLDC motor control unit with the A4964 Driver. I made the design for working on 24V supply. I did severals test and HW/SW modification but unfortunaly, the motor won't run ...
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61 views

Control design for a brushless dc motor

I want to perform a speed control for a 1500W brushless DC motor. The documentation and videos I've seen use arduino uno and are for smaller engines. I would like to carry out this project without ...
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38 views

BLDC hall sensor angle

the hall sensor of the bldc motor will give 6 states (represents the 0 to 360 electrical cycle). But what is the exact angle of the each state (that is for 101= ? degree, 100= ? degree....) I googled ...
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32 views

Can I extend my ESC to motor using some thick wire? is it possible to do in that way

I'm doing a drone project for my academics. my arm of the drone is a little bit longer. How can extend my ESC? I watched extending a power-ESC cable will make problem, but increase ESC-Motor cable ...
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52 views

sinusoidal bldc LUT synchronization

i trying to control 3 phase BLDC motor. I already done 6 step commutation which works fine. Now i going for sinusoidal control. Have studied more about sinusoidal control in bldc and got some idea. I ...
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33 views

Calculating Rotor Inertia or Mechanical Time Constant for BLDC Motor from Published Specs Only

TLDR - Is there any way of calculating the Mechancial Time Constant and/or Rotor Inertia and/or Run-Up Time based soley on the specs provided on this motor My end goal in asking this question is to ...
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2answers
81 views

Mosfet Driver IRS2007 failure when running with mosfet IRFB3607

I am designing a BLDC motor controller and facing some issues with using an IRS2007 along with IRFB3607. For one phase, the high side and low side give clean wave forms as long as V_Pow is ...
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2answers
38 views

How to predict and compensate for the dynamic and static resistive torque due to losses in a motor

I will have external torques acting upon an axle to which a motor is connected. I want my motor control system to fairly precisely compensate for most of the torque that the motor imposes on the axle ...
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62 views

How to prevent voltage spikes when motor is turned off

I have a schematics as shown below. The power source is a benchtop power supply which supplies a constant 24V power. Motor is controlled with ESC. When running the motor and then turning it off I ...
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3answers
115 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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4answers
77 views

High torque low rpm BLDC Motor

I am creating follow focus system (motor with gears that moves camera lens ring). Vast majority of such systems use low Kv high torque BLDC motors - similar to the ones used in gimbals. I think it is ...
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1answer
39 views

Confusion with winding voltages for a fixed positioned brushless motor

Below is examples of various commutation forms different driving ways of a brushless motor: Such a motor can be BLDC or PMSM. My question is: imagine we set the motor position to a fixed stationary ...
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72 views

Is the BLDC motor and “brushless AC servomotor” same thing?

Are the terms BLDC motor and "brushless AC servomotor" exactly the same thing? I cannot find information so far whether there is difference. For instance, at this site they are treated as if the ...
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73 views

spwm look up table {For bldc control}

I am trying to implement sinusoidal control in BLDC motor. After doing some research about sine wave controller. spwm and svpwm are the better controlling methods for sine wave controller. So I first ...
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53 views

Using motor encoder with VESC

I want to use this BLDC motor on a project. In its datasheet, the encoder pin sequence is shown as follows. I want to control this motor with a VESC. There is an overview of the board here. In it, ...
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48 views

Ebike brake lever cutoff switch / interrupt switch : How does it work? [closed]

When pressing the brake lever on my ebike the BLDC motor controller (aka ebike controller) 'cuts power' to the motor until the brake lever is released again/sensor is deactivated. I would love to know ...
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21 views

High output of NCP5104 (half bridge driver) is active in dead time zone. How can I solve it?

I try to drive BLDC motor. I have a problem in gate driver circuit. I use three NCP5104 gate driver. NCP5104 has 520ns internally fixed dead time. "The dead time is the time between the high side and ...
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Diagnose brushless three phase motor controller

Can I test somehow if my brushless motor controller works? After some time of playing with it and with the three phases motor from old HHD, this pair just stops working. LED is on, but nothing more ...
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36 views

How BLDC motora coils and magnets are mechanically arranged

I've read some articles about how BLDC motors principle (in my case 3-phase) with something also about linear BLDC. This documents talks about actuation and theory. But looking at drawings I became ...
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1answer
46 views

Circuit for stabilizing the mini - 3 phase wind turbine output to 5 Volt using 7805 IC

I am trying to get some stable output from a Brushless power generator/motor/turbine which i purchased from Aliexpress Mini Micro Small 3 Phase Turbine To check if it works i tried to rotate it and ...
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2answers
53 views

how to use sensored BLDC as stepper motor

I am making a huge line following robot and using arduino & sensor BLDC motor salvaged from Segway. The problem is that I am not able to control the motor properly. If the PWM signal is low the ...
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2answers
571 views

Why are always used N-Channel MOSFET on both High and Low side on BLDC applications?

As title, I always see an N-Channel MOSFET on both HIGH and LOW side of a 3-phase BLDC motor driver. i.e. Can you explain me why is better to use 6 n-channel instead of 3 n-channel and 3 p-channel? ...
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5answers
125 views

Small 5V BLDC motor controller - 6 mosfet IC

I am creating follow focus system (motor with gears that moves camera lens ring). I think the best choice is BLDC motor (DC geared are too loud, stepper don't have enough torque or too big). I need ...
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2answers
44 views

BLDC Motor PWM commutation scheme

Actually I'm trying to understand how to control a BLDC motor using trapezoidal method. I've found two illustrative images that show how to PWM each motor phase: First Second In both of this images,...
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45 views

BLDC motor design, physical appearance question

Excuse me if this is a dumb question, but I always wondered why are BLDC motors usually quite short in comparison to their diameter? Is it due to some electrical properties that make this design the ...
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1answer
49 views

Circuit to run a 3 phase magnet generator as motor?

I am trying to convert a wind generator to a brushless motor. As you can see at the image, it has 16 magnets and 12 coils. The coils are connected as 3 phase, star connection, so I have 3 output ...
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4answers
65 views

Torque of motor vs operation as generator

While trying to work out which motor to use for a wind turbine project, I'm coming across torque numbers for DC motors. I'm mainly looking at a BLDC motor right now. Clearly, for a smallish turbine ...
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32 views

How to use this BLDC and know more about it?

I have this BLDC I removed from a CD Drive. I want to use it. Just for playful reasons. But I don't know what to make of it. Where to get started with on the Internet. Any help will be appreciated.
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55 views

BLDC/BLAC controller motor voltage reverse protection

I am currently designing a BLDC controller and keep running into a power safety issue: I have added a smart diode reverse protection controller to my design with its transistor between the fuse and ...
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1answer
70 views

BLDC motor drive: Requires an external push to start rotating

I am trying to drive a 23-pole pair(i.e. 46 poles) BLDC motor using an LV8139 pre-drive, the output of which is fed to drive the 3 half bridge MOSFETs. I managed to connect the correct phase sequence(...
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1answer
80 views

Why do lead-acid batteries perform better than Li-ion with substantially more ampere hour?

I've been using a 36V motor that draws ~13A current at peak. I initally used a set of three lead-acid (12V 12A) batteries in series to power the motor. They had sufficient power to easily take a ...
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48 views

Controlling speed and position of DC Motor

Is it possible perhaps with an Arduino to control the speed and number of revolutions on a brushless DC motor or a worm gear DC motor? I'm asking because I know steppers and servos can do that but ...
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61 views

Relating input torque on BLDC motor shaft with output current

I am trying to build a drone generator with a gasoline engine and a 14-pole,170KV, 2KW BLDC skateboard motor (this one). Before designing the system and running it, I wanted to clear out a fundamental ...
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54 views

Best Electric Vehicle Motor for DIY [closed]

Which motor would be Cheap and a motor which can generate as well as produce also... I am looking for a prototype for a car so it needs to cost less
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44 views

FOC current and speed limits

I am trying to simulate BLDC drive using FOC with svPWM. The drive works very well in the continous operating regions, however i also want to include current and speed limits on the simulation. I have ...
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3answers
84 views

Running a brushless DC motor on low rpm using servo tester

Background I'm working on a gift for the wife for Christmas - an electric bobbin winder (a winding machine/spooling machine) - which will work in the same way as this machine: It winds yarn on ...
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1answer
38 views

DQ currents of BLDC

I am trying to apply FOC scheme with SVPWM for controlling a BLDC and comparing the resuls with trapezoidal commutation. I have my BLDC model and it is working correctly with trapezoidal commutation. ...
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3answers
43 views

Correct way of calculating BLDC torque for a given RPM and Current

A permanent-magnet 3-phase brushless DC electric motor is attached to a load. Motor is operated with vESC6.6 inverter, which is software-limited to 140A. Measured efficiency at maximum power is 81%. ...
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1answer
44 views

Bldc motor speed control

Can field orient control can be applied in BLDC motor with trapezoidal back emf?Washing machine has concentrate winding which give trapezoidal emf. how they use FOC there?how is that working?I have ...
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118 views

Using an IGBT with a small ESC for large BLDC

I think I have a modest understanding of how an ESC for RC hobby crafts works, and how a BLDC motor works. I've been wondering about how to make an ESC that could run a motor with large current ...
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64 views

Running a 36V motor controller on li-ion [closed]

I recently bought a 36V BLDC motor controller (the $10 ones from ebay) without taking into consideration that when fully charged my battery voltage is actually 42V. I found a similar question where ...
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112 views

why do the large industrial lathes, 1 HP upwards still use induction motor and not BLDC?

I'm trying to find an answer as to why exactly larger more powerful lathes still have 3 phase AC induction motor. All the benefits of a BLDC seem to far outweigh the use of an induction and they seem ...
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72 views

Purpose of an Electronic Speed Controller(ESC)

I need to implement a brushless dc motor and I know the motor needs to need constant control to ensure that consistent torque is applied to the rotor. What control does the ESC provide and what ...
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1answer
24 views

Why isn't \$I_s\$ (resultant current phasor) zero in FOC of PMSM?

Suppose I have 3 phase (A,B,C) star connected PMSM. For running this motor with FOC the \$I_s\$ (resultant current phasor or \$I_a+I_b+I_c\$, where \$I_i\$ is current in the phases) is keep at 90 ...
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2answers
43 views

Physical principle of the torque of DC and BLDC motors

I have watched several videos about this topic. According to these videos, the torque of DC motors relies on the Lorentz force (a force that acts on moving charged particles in a magnetic field). ...
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34 views

How to know how many phases a BLDC has?

I have a quick question, how do I know how many phases a BLDC has? For example, an E-bike motor kit has three motor wires: yellow, green and blue. It also has three wires for the hall effect sensors: ...
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Modeling a BLDC motor on Simulink

I am trying to model a BLDC motor on simulink. But after doing some researches I found out that it is easier to model the BLDC motor like a DC motor. How realistic can this modeling be? Supposing ...
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60 views

Brushless DC motor values at voltage other than nominal

I am currently using a maxon three phase BLDC motor (datasheet PN:412825) that is rated for 48 volts (see spec sheet below). I am running the motor at 18.5 volts (requirement for my application). I am ...
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39 views

sensorless/sensor FOC in bldc motor

In all the papers of FOC of bldc motor, 1st rotor angle is calculated then current in the armature is applied such that the current vector becomes perpendicular to the rotor angle. What is this rotor ...
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22 views

BLDC Motor Field Flux Direction

In a 2 pole BLDC motor i can see the net direction of the field flux (coming from north pole and going towards south pole). But in 4 pole BLDC motor what will be the direction of the net field flux? I ...

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