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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11 views

Running a BLDC Ceiling Fan on an Off Grid DC System

first post here and I'll start by saying my electrical knowledge is limited at best. So I'm building cabin/weekend house and attempting to run the entire house, at least for the time being, on DC. ...
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Powering brushless motor only works with separated power supplies

I have recently taken over for a guy who retired from my company and I am working on getting a prototype that he designed back in 2016 up and running. We are using two 3.6 V 18650 batteries to power ...
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39 views

Low power BLDC driver

I’m trying to alter a drive based on the drv8301 to work from an ATEX verified power supply. This means that the current will be very much limited. I want to implement this by connecting this power ...
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42 views

Converting Hall-effect sensor data to encoder data

I want to design a sensored BLDC motor controller, but I have a question. How can I convert sensor data from Hall effect to encoder data? Can I convert Hall effects to encoder data correctly when I ...
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82 views

What is this torque I am measuring?

I have a small brushless motor running at 3 V and a cardboard disc (about 5.5 cm radius, 3 mm thick) which can be attached and detached from the shaft of the motor. When the disc is not attached the ...
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63 views

How to use this 2 coil motor as a hand crank?

I found this used motor coil and got a few questions on how I can make it useable as a hand crank. There are 2 coils with respectively 2 wires each. How exactly do I know the way of how each coil ...
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72 views

Emergency brake BLDC motor [closed]

I am redesigning a flawed safety system for an autonomous robot. The robot will drive alongside humans and roads, thus it needs redundancy. The braking is achieved in two ways: The motor controller ...
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61 views

BLDC - Field Oriented Control

I am designing an AGV for which I am in the process of selecting a controller IC for BLDC motor. I read through design considerations document by TI and came to know that FIELD ORIENTED CONTROL will ...
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42 views

Measuring BLDC motor resistance during operation

Question Is it possible to sense the resistance of a hobby BLDC motor during operation? I should clarify that I'm trying to quantify how resistance increases due to thermal effects under load. Thus, I ...
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34 views

Difference between turns function and winding function PMSM?

What is the difference between turns function and winding function as applied in the Modified Winding Theory and how do I compute them given the parameters of a PMSM?
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37 views

Controlling a BLDC at low speeds

I want to try and implement a steer by wire system with two BLDCs. The task requires rotating the BLDC at low speeds. I have a 30A simonk ESC as the driver, and an arduino MEGA as the microcontroller. ...
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Sinusoidal Driving BLDC without FOC?

I want to drive my BLDC motor sinusoidal. In this point I want to model my system correctly to analyze it better. So I want to simulate it in simulink first. To get model with sinusoidal driving: I ...
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32 views

Controlling two traction motors in a car

I'm doing an ev conversion and decided to go with two PMSM motors and two inverters (each for one axis). I'm trying to understand how to control the power output on each axis. I know that RPMs on both ...
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42 views

TEG (seebeck) to drive small brushless motor?

is it possible to drive a small (~ 24x30mm) brushless motor with a small (40x40m, ~0-3V) TEG module? I am trying to educate myself on brushless motor function and control but can't find much info on ...
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82 views

Can I run a brushless motor on Raspberry Pi via Python?

I am using a 1000kv brushless motor and 30A ESC and I want to run it. Does anyone have any idea for that?
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ESC's Brushless Motor PSU and Maximum Torque

I am looking to purchase DC 12V 83.3A 1000W Power Supply and will use 4 brushless motors A2212 1400KV Brushless Motor. I have checked the Motors and they require 11.1 V and Load Current: 19.0A Power:...
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117 views

Multiple ESCs, one power supply

I am currently embarking on a project that requires 4 brushless motors. Let's say the KV rating for each motor is 1400kv and requires a 30 A bi-directional ESC for each motor, and that I want to power ...
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42 views

FOC for BLDC and PMSP - is there any difference?

Is there any difference in field oriented control for BLDC and PMSM? If they both have three-phase stator winding, then the only difference is their back EMF and therefore the way they should be ...
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56 views

Electric Scooter Hub Motor RPM relationship

I am based out of India and have done a Electric conversion of a ICE 110cc scooter to Electric. Here is the images of the hub motor. The motor is a 1kw BLDC hub motor of 10 inches tyre size. Specific ...
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37 views

Small motor seized

Alright I'm trying to get my pellet grill up and running prior to Thanksgiving and I seem to have a seized motor. The past few days I was working on clearing a pellet clog in the middle of the auger ...
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69 views

Make 3 phase motorcycle stator as engine starter

I've been studying this for more than a year. I want to make a BLDC controller to start a motorcycle engine, where the power source from a 12 V battery is input into the BLDC driver and then input to ...
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Can I use any variable 0v-5v source to engage ebike controller to work as if it had a twist style hall throttle?

The hall throttle plugs to a 3 wire connector. 5v, signal and ground coming from the controller goes through the hall throttle and is reduced to 0v-4.2v for a variable speed control. My question is, ...
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76 views

I have an ebike from china with no documentation. I need to determine the pole pair count in the motor so i can properly program the motor controller

My motor is 3 phase , 48 volts and up to 1500 Watts; it has 51 coils inside and 46 permanent magnets that I counted upon taking it apart. The controller is inside the motor. Also the PWM is set at 0 ...
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31 views

PMSM phase currents rms values are too much higher than supply dc current

I implemented to FOC tecniques with SVPWM switching method a bldc motor. And I realized that when dc supply current is 0.2A dc, phase currents pick values about 2.1A. The circuit has 3 low side shunt ...
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61 views

Brushless motor makes knocking noise when running in reverse

I bought this off of ebay, to go into my Razor MX500 dirtbike and connected it to a 72V 20AH lifepo4 battery. After fitting the motor, it was running nice and smooth but I noticed that it was driving ...
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78 views

How to do a power limiter for brushless motor?

I need to limit the power of my brushless motor at 700 watts. I don't have a fixed motor or propeller. For any configuration the max consumed power need to be less or equal 700 W. The max current of ...
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60 views

In 3-phase motor control, what are the physical meanings of the `d` and `q` axes?

The axes have interesting properties, such as the fact that in low saliency permanent magnet motors (outrunners are common examples of this) only the current in the q-axis creates torque. But the ...
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70 views

How are real-time speed and torque of a brushless DC motor computed?

Let's suppose I need to work with a three-phase brushless DC motor. The DC motor has only three wires to control its 3 phases, there is no other wires (no Hall effect sensor return for example). ...
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Lipo battery with ESC and BLDC motor

I'm not sure if I can connect four brushless dc motors to my Lipo battery. I don't know how to calculate it. The brushless motor I have is the Turnigy L2210C-1200 brushless motor (150w) and the Lipo ...
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188 views

BLDC vs Stepper motor

How is a BLDC motor fundamentally different from a stepper motor? They both operate in the same way where you manually energize coils to force the rotor to turn. Is there a reason you couldn't do ...
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31 views

What are the considerations for placing brushless motor controllers in parallel by syncing the PWM output?

If I have two identical brushless ESCs, and I would like to mate their outputs up in parallel in order to have something approaching 2x current handling, what kind of challenges need to be met in ...
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53 views

BLDC worked, but now always in stall. Hall sensor problem?

I have a Maxon BLDC motor (with Hall sensor, no encoder), controlled using ElectroCraft driver, and Arduino UNO. The motor used to work just fine, however it stopped working and instead, it clicks and ...
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64 views

Can I use an AC motor rotor as an outrunner BLDC motor's stator?

I want make outrunner BLDC motor by myself. I am looking for an easy and cheap way to get the inner stator part of it if available. I see this AC motor armature and it uses almost same shape and ...
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1answer
88 views

Powering a DC Motor Controller + DC Motor with AC Power Supply

TL;DR: My system needs DC power input--maximum of 250W @ 24V--but with the use of an A/C power source. How do I go about this? I have no idea where to even acquire a DC power supply, but I'm not sure ...
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68 views

High frequency BLDC control for parallel speed and position control. Looking for thoughts

I was not able to find a similar topic but am kind of stuck with my problem. What am I doing? I am trying to control the speed of a BLDC Motor very precisely but have to control the position of the ...
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59 views

How much weight can this DC motor and wheel combination carry? [closed]

I'm trying to make a RC Car with a total weight around 1kg. It will be 4-wheel drive with differential drive algorithm. The count of motors will be 4 DC motors simply. I have chosen the following ...
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224 views

Brushless DC motor with built in controller

I bought a brushless DC motor on ebay that contains a controller. It has five wires. The wiring instructions provided are as follows: Method of connecting wire Red line: Connect the power positive ...
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25 views

Transient generator simulation torque fluctuation (Ansys Maxwell)

while simulation for a PM axial flux generator at no load 1000RPM in Ansys Maxwell, shows moving torque fluctuating between -0.7 to 0.7 Nm, which should have been 0, as there is no load attached and ...
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62 views

Quasi Direct Drive Actuator - Slot & Pole Combinations for High Torque Motor

I am building my own Quasi Direct Drive actuator and looking for information/ design guidelines for building a High Torque Motor similar to the MIT Mini Cheetah below. Specifically I cannot seem to ...
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1answer
53 views

Mitigating parasitic turn-on of MOSFET

UPDATE Thanks Aaron and jp314 for your comments. We just probed some more and I think jp314 is right. We found that the high side driver was skipping some pulses. The pink pulse train is from the ...
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52 views

DC Motor driving large offset mass, smooth acceleration/deceleration?

I've got a large mass (0.5-2kg) on the end of a 0.5m rod. I'm trying to swing it smoothly as an inverted pendulum using some brushed DC motors with planetary gearboxes and quadrature encoders (GoBILDA ...
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36 views

Controlling motor EMI - more ferrite turns or shorter cables?

In wiring up a small robot, powered by two BLDC motors (of the "hoverboard" variety), I was going to shorten the leads a bit, and wrap them one turn around a soft-core ferrite for EMI ...
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102 views

BLDC alignment of hall sensors and encoder

I am trying to build a BLDC motor controller using field oriented control. The motor I am going to use is equipped with hall sensors as well as with an incremental encoder that has 512 steps. I have ...
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75 views

BLDC waterproofing for submergance

I have modified a number of brushless DC motors to make them work underwater. The motors are the type with hall effect sensors. I did the following procedure on several motors, but the results have ...
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1answer
70 views

DIY Ebike BLDB motor controller, low torque, is it my motor?

I've designed a 3 phase inverter for driving a BLDC hub motor. The design (if anyone wants to look at schematics, is here). This works well, the motor spins up and down fine, no worries. However, if I ...
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62 views

Hall-sensored BLDC motor does not spin and triggers a fault condition

I've been trying unsuccessfully to run a hall-sensored hoverboard BLDC motor (24V, 250W) using the MP6532 chip. The PWM signal is generated using TIM1 in ...
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61 views

How to use the "Function type" fans

I have these AFB0824GHE-R00 Fans in my hands, and I see that there are three wires on that fan. The + and -, and the third blue wire, which according to the datasheet's hint is a function wire? I am ...
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93 views

Help - Brushless DC Motor Randomly Stalling

I’m encountering a problem that I would love your help with: I have a brushless DC motor rated (1.5v to 9v). I’m feeding a range from 3.36v to 3.95v (see the video, wiring diagram, and motor specs ...
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174 views

How can this BLDC motor have constant torque over its RPM range?

I was going through this catalogue of BLDC motors for my EV project. I found two motors in it, one rated at 2.5 kW of peak power, and the other 6 kW of peak power. My questions are as follows: It is ...
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138 views

How much power will a 4kW BLDC motor use if ran for 3 hours?

My college is participating in a competition to build a solar car with batteries. After doing calculations, we have decided on using a 72V, 4000W BLDC motor. Now, we need to run the vehicle for 250km ...

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