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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55 views

How to convert rotor position encoders: from resolver to analog sin/cos?

I received a large motor (3-phase BLDC) that has one of these resolver type of position feedbacks built-in: It expects 10 kHz 7Vrms drive on the exciter coil, and two amplitude-modulated outputs ...
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28 views

High side mosfet- Extra pulse on turn off

I am making a 3 phase motor drive H-bridge using N channel mosfets (IRFB3607) and BJT based custom mosfet driver such that my turn on and turn off time is about 200ns. Right now I am testing the ...
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54 views

BLDC motor information to build an E-bike

I'm planning to build a light e-bike kit and want to use a super-efficient BLDC inrunner RC motor. Many people seems to build e-bikes around AstroFlight 3210 2kW motor, because it is the most ...
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Is this the right way to connect a Brushless Motor Driver Output Signal to a CNC BreakoutBoard?

I will purchase a Spindle Brushless Motor Driver to drive my Lathe Spindle, and I need to know if I´ll be able to connect an output signal from the Driver to my CNC BreakoutBoard (BOB), which is a ...
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115 views

Why do some motors have high rpm while other have low even though having same power consumption

I have seen a 500w motor which run on 1200 rpm but a 300w motor with over 10000rpm . I know using a gearbox can give required rpm or torque and torque is inversely proportion to speed but how can I ...
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42 views

I want to make a BLDC Hub motor for my bicycle but I am 10th grade and doesn't now so much about electrical engineering

Firstly, I want to make a BLDC motor WITH hall effect sensors to maximize the torque. I have a heavy mountain bike and I love to make long trips with it. But in my city, there are REALLY steep ...
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16 views

terminal resistance of delta-wound BLDC motor

When the producers of BLDCs state terminal resistance and terminal inductance of a delta-wound motor, do they mean the R-L of the parallel between 1 triangle-side-coil and the series of the remaining ...
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41 views

To control motor : 1phase, 230 V brushless, via RaspberryPi

Is there any preferable or possible way (i am still recognizing the borders), To have set of equipment, where we would have 1phase, 230 V brushless electrical motor, (with the ventilator on the shaft)...
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432 views

What does “Brushless DC is an AC induction motor with built-in speed feedback” mean?

I found a quote which states that: "Brushless DC" is a marketing term for "AC induction motor with built-in speed feedback." Is it correct? What is "built-in speed feedback?" I found a decent ...
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DJI Ronin camera stabilizer gimbal - motor type and wiring question

I have a DJI Ronin gimbal that I want to modify in order to be able to tilt the frame left or right more than 45 degrees and the camera to keep horizon. 45 degrees is the gimbal limit after which the ...
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68 views

U-Shaped Electromagnet Configuration for a motor?

I've been thinking about motor designs and where all the power goes for an electric motor, especially in terms of used/unused power. I noticed that in most motor designs, the neodymium magnets float ...
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66 views

High level vs low level motor control - acceleration and velocity profiles

I was wondering how are motor control loops normally run? Lets say we have an autonomous car and a Model Predictive Controller defines a velocity and acceleration profile to get to the correct ...
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28 views

ESC motor calibrated, but still beeping and not responding

I am using this motor called abcGoodefg RC 2200Kv brushless motor. At first, when we followed the sample code on this website, things went well. But when we changed 1000 and 2000 to 10 and 20, ...
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43 views

Half bridge Gate Driver UVLO

I am interested in designing a BLDC motor driver capable of operating at low supply voltages and relatively high currents (i.e. a device capable of operating with a 3V minimum supply and a phase ...
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64 views

Side effects of using a motor with a greater current on a battery with a lower rated current

I'm looking to power a 33A brushless DC 2000w 48v motor. Ok so I have a lithium ion battery, and it's manufacturer states this: Specs: 48v 1000w 13s3p 28Ah Rated discharge current: greater than or ...
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1answer
65 views

BLDC Motor - Reason for different number of pole pairs on rotor / stator

The figure below shows a BLDC motor (TSDZ2 Ebike Motor). It has 18 stator windings (3 phase -> 3 pole pairs per phase) and 16 poles on the rotor. What are possible reasons for this design? Why is a ...
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94 views

Upgrade BLDC motor controller (ESC) to higher wattage (replace mosfets/shunt)

I was wondering if I could upgrade my current bldc motor controller (three phase motor)(*) to a higher wattage/output power by doing the following modifications: Replace mosfets with higher power ...
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44 views

Efficiency test for motor drives

Hey I have a BLDC square wave controller. How to check the efficiency of the controller alone (not including the BLDC motor). Any suggestions ? I have checked with DC load test machine, but what I ...
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79 views

Can I emulate BLDC motor torque control with a speed controller?

I am looking to use a BLDC motor to control a reaction wheel. Since this will be used to provide balancing torques for my system, I really only care about the motor torque, not speed (assuming I stay ...
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61 views

BLDC commutation

I have some dilema with commutation on BLDC motor. I have driver for BLDC (MP6540) and I can commutate BLDC motor but motor it is heating up and speed is not appropriate (datasheet says that motor ...
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35 views

8 pole-pairs BLDC sensored control design

I need to control a 16 poles BLDC motor, sensing the position of the rotor with an optical encoder that support 3 integrated commutation output pins (U,V,W), emulate the output of hall effect sensors. ...
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50 views

Building An Electric Cart

I am trying to build some sort of electric cart, to help me push something. The cart would have to push about 120-150 pounds. It wouldn't have to completely push the whole thing, just assist me with ...
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50 views

How can I drive this 4 coil motor? [closed]

I have a motor that I pulled off a broken Dyson v8 hoover. When I removed the broken driver circuit(the capacitors snapped off) I found this motor layout with 4 coils and no wiring pattern. How can I ...
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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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86 views

What is limiting my BLDC Motor power Output?

I am using a BLDC 3 phase hub motor and recently installed a motor controller rated for 3000watt (I originally had a 1200Watt controller installed). The motor is rated for 500w nominal 800w peak but ...
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32 views

help with Ostergrens Elmotor A/B

I have a brushless DC motor with the company name mentioned above. Does anyone have any experience with this motor? there are 6 wires coming out of the motor controller from the looks of the wires I ...
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137 views

Differences between bldc sensorless motor

I am designing a driver for a sensorless bldc motor and I have found these two types of motor configurations. I attach images. Img 1: Img 2: Both are bldc sensorless motors? How can I know the ...
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26 views

3 phase sine inverter

i am trying to control bldc motor (sinusoidal commutation). I am somewhat controlling bldc motor, by applying sinusoidal voltage with 120 phase shifted to the phases. Now my issues is i cant able to ...
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1answer
146 views

Where to place hall sensors (BLDC motor)?

I have a BLDC hub motor (out runner type; 3 phase wires) for my electric bike. It currently has 1 set of hall sensors (3 pieces) and I would like to install a second set (3 more) for spare (in case ...
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62 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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86 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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188 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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65 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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71 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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55 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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125 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
53 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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86 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
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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4answers
252 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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45 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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89 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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171 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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1answer
168 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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29 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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48 views

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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88 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
50 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
96 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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667 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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