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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BLDC motor/PMSM parameters at reduced operating voltage

I was thinking about nameplate parameters of BLDC motors/PMSM and wondered what happens to those values if I operate the motor at a lower voltage as rated. Are my following conclusions correct? If ...
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33 views

Controlling the speed of a brushless motor with the HA13535

I am using an HA13535 three phase brushless motor driver as described in this datasheet: http://www.datasheetarchive.com/dl/Scans-052/DSAIH00045920.pdf The datasheet says the circuit features digital ...
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Building electrical exercise bike [closed]

If any question like this was asked before, sorry. We intend to build an exercise bike with a brushless motor. Anyone will be able to adjust the difficulty of bike. It could be easier or harder to ...
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4answers
86 views

What PWM frequency would give higher torque or RPM for a Brushless DC Motor

We use brushless DC motors (three phase, star wound, 540 size)in RC car applications, these are controlled by electronic speed controllers (ESC's) which will obviously vary the voltage etc supplied to ...
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67 views

How to control a (different) brushless motor

Note: I will be updating this post with detailed images and measurements later. Someone gave me a brushless motor made by Maxon Motor and I have no idea how to control it. The only information they ...
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82 views

Can I connect multiple brushless motors and ESC's to a single GND in Arduino Uno?

The main aim is to connect 4 motors in parallel each with separate ESC's to a single GND. I want to do this because there is a limited number of GND sockets built in the Arduino microcontroller. I ...
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1answer
72 views

Will this computer case fan power a lightbulb?

I'm attempting to help my daughter build a wind generation model for her science fair. I've found some prebuilt kits but the shipping is more than the product. Doing some research it seems she can ...
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2answers
45 views

Why are shunt resistors in BLDC motor drivers placed betweent MOSFETs and ground and not MOSFETs and the motor?

In all projects like that I found and in the application note of DRV8302 the shunt resistors for current measurement are placed on the ground connection of the transistors. Why not place them in ...
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0answers
29 views

When do you use a brushless motor driver and when do you use an ESC?

I'm trying to build a drone from scratch on my ARM microntroller on a Tiva C series development board. I know you need a motor driver(controller) to control a motor, but in the case of a brushless ...
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3answers
58 views

Can 3-phase FOC control be done without current measurement?

Can a FOC control scheme be done using a rotary encoder to measure the position, speed and acceleration directly, or is measuring current necessary? FOC is a motor control scheme as described in ...
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2answers
43 views

Are there any disadvantages - apart from initial purchase cost - to over speccing a BLDC motor?

I am trying to find a BLDC servo motor for a pump. I have calculated the required speed, but while the manufacturer was good in getting back to me with the torque requirements, they did not give much ...
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1answer
38 views

ESC to convert AC to DC?

I'm starting a project where I want to use a BLDC motor as a generator. I understand that BLDC's need an ESC to be controlled. Essentially an ESC converts DC power into AC and provides the necessary ...
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2answers
47 views

ESC motor and battery matching

How can you tell if an ESC, brushless motor and Li-Po battery will work together. Specifically, I have a A2212 Outrunner Brushless Motor KV2200, 30A Brushless Speed Controller ESC and I am looking for ...
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1answer
69 views

Charging ultracapacitors separately and using them in series for regen braking system

I am a mechanical engineer therefore please correct me if there is anything that I got wrong. I am working on a regenerative braking system for an IC motorcycle and I am looking for the best way to ...
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1answer
90 views

Designing a brushless DC motor:

I watched a DIY video recently on building a brushless DC motor. Can someone demonstrate for me how to calculate the max torque & max rpm of that motor based on the components that are used in ...
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31 views

Current path during freewheeling diode conduction In brushless motor

The model of brushless dc motor along with an inverter circuit is shown as follows: Let's say the phase energizing sequence is: AC--AB--CB--CA--BA--BC--AC Let's say phase A(+ve) and B(-ve) are ...
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1answer
100 views

Why won't this PC power supply run my BLDC?

I would like to power my Arduino and BLDC to be powered with an old computer power supply. My Arduino needs 5V and my 3 phase BLDC needs 12V. simulate this circuit – Schematic created ...
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2answers
63 views

Brushless DC Outrunner Motor Control

My question arises from interest mainly in Outrunner motors which are used on RC planes/drones. With that being said, I understand that these motors are controlled by an Electronic Speed Controller ...
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0answers
33 views

How to convert a BLDC motor to a generator?

I want to convert an electric bicycle's brushless DC motor hub to a generator, in order to convert mechanical energy to electrical energy. How can i do that? taking into account that most BLDCs have ...
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2answers
36 views

BLDC Outrunner Motor Windings

Is there a specific way Outrunners are normally wound? (Wye or Delta) What are the pros/cons to winding the motor a certain way?
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45 views

What is wrong with this brushless dc motor commutation

I am trying to understand the working of brushless dc motor. Here is the setup I am referring to: Here is the commutation sequence: And, here is the waveform I get: Many application notes ...
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1answer
39 views

BLDC Motor Driver: Justifying better design approach

When and why it is better for a design engineer to design a BLDC driving circuit using individual MOSFETs, instead of selecting a ready made driving IC to simplify the design? Here I just do not ...
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2answers
100 views

Brushed or Brush-less DC motor

We are trying to build a small Solar car the car's dimensions (Length :100CM, Width 60CM) the car mass is not going to exceed 2KG The car speed can be up to 2.5 or 3 m/s We`ll be using PV modules ...
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1answer
206 views

Can you damage DC motor by backdriving it (with disconnected leads)?

We are looking for application where we need sometimes backdrive DC-motor manually. In order to protect motor driver and rest of the electronics we're thinking of electrically disconnecting motor ...
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1answer
41 views

How to connect absolute encoder on the rotating shaft. Please see the three options?

Hi, Here I have added 2 options for connecting encoder on shaft. Motor, gearhead and shaft is connected using coupling. But where will be best place for encoder (To avoid backlash from coupling ...
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1answer
137 views

MOSFET Driver Stress

I am using an Allegro Microsystems A4935 3-phase MOSFET driver in a brushless speed controller. I recently got the motor spinning, but when I began increasing the voltage, my commutation started to ...
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1answer
90 views

Basic question on powering a DC motor

I'd like to use my ATX PSU to power a DC motor Turnigy L2205_1350 motor Voltage: 7.2v~11.1v (2s~3s) Max Power: 100w Max Current: 13.5A No load Current: 0.3A Can I connect to 12V+ on the PSU? I ...
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93 views

Running 3 Phase brushless DC Motor at Full speed

I am trying to run a HDD Motor at Full speed to create a POV.I have figured out the Combo that makes it run Forward but when I decrease the amount of delay between the pulse it skips a step. I am ...
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1answer
47 views

Help with Motor encoder connection with motorcontroller

I am new to building drones and bots. I started out using motors without encoders with my Roboclaw Motor Controller for my pet project. Here is the controller's link. Connection seemed simple and it ...
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0answers
46 views

Brushless Motors and ESCs

I have an ESCs which has A,B,C output ab a brushless motor which has red,black and yellow inputs.In several forums peopls's advice is to connect them in any way and reverse the connection if motor ...
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0answers
53 views

Will these electrical parts be fine for a quad-copter?

I will be using this BLDC Motor for my quad-copter. Although the Max current of this motor is not specified in the link's description I already made my calculation based on wattage and volts ...
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1answer
67 views

DC Motor with coil inside a rotating magnet. How does it work?

I have seen the following patent online. And I was wandering how that motor works. It seems that the vector of the cross sectional area of the coil is parallel to the vector of the rotation of the ...
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1answer
112 views

How to use a salvaged brushless motor

I recently took apart an HP LaserJet 1320 laser printer to salvage parts from it. Along with 3 solenoids, a fan, lots of gears, 83 springs, and 71 feet of wire, I got a large brushless DC motor with ...
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41 views

bldc wing switching moment

I am developing my own ESC now. Here is schematic: I use 6-step driving sequence for a BLDC motor: http://www.edn.com/design/sensors/4407580/Brushless-DC-Motors-Part-II--Control-Principles It works ...
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43 views

help with the BLDC motor 4-pin

Hello you could help me? What is the difference between integrated TDA5140A and TDA5144, I found that I can use both, but I think if I need to make the rotation speed control and what I do with the ...
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1answer
120 views

How can brushless DC motor has constant torque?

Have read somewhere, that brushless DC motors have constant torque. How can this be true? Regard motor on the picture: If constant current flows as red arrows indicate, the magnetic field appears ...
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1answer
109 views

Brushless DC motor model for model-based design

I have seen this diagram or something like it being used to model a DC brushed motor: With a resistance, inductance, input voltage and load inertia basically specifying the motor. What would be ...
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1answer
118 views

BLDC Motor Maximum Locked Rotor Current

Is there any equation to find the maximum Locked Rotor current using the motor characteristics values? The motor I am interested in is ThinGap 7140. Here is the datasheet: ...
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1answer
52 views

Using a stepper motor for an electric bike

I'm going to design an electric bike using a BLDC motor. According to my knowledge there are two types of BLDC motors: normal BLDC motors and stepper motors. Can I use a large stepper motor for ...
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1answer
59 views

Hi-Z state, MCU and transistors

I have a 3-phase motor h-bridge. The inputs to the motor require 3 different phases, +, -, and ...
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2answers
293 views

MOSFET selection for BLDC motor drive

This question is related with the one I asked sometime ago about the heat generated when driving a BLDC motor BLDC drive inverter circuit problem. The problem is, the MOSFET chip got heated up ...
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1answer
85 views

Is my dynamo a BLDC generator or PMSM generator?

I want to ask you about a problem please. I have bought an AC dynamo generator (the commercial name). First I don't know is it an AC synchronous generator or a BLDC generator. The dynamo has 12 ...
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74 views

DRV8313 for BLDC

I am looking for simple IC solution for BLDC driving in own quadrotor with a minimum number of components. Is it possible to use DRV8313 for that purpose? There is a lot of eval boards of brushless ...
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1answer
65 views

in order to understand bldc motors and their working principle, I read a lot on the web, and I see them like a tripolar steppers, am I right?

I was told my previous questions were not well received by the community, it was never my intent to post a repeated question or a bad formulated one, and english is my second language, not my ...
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1answer
84 views

The Hall sensor in a BLDC - winding magnetic field interference?

I am wondering what is the impact of the magnetic field generated by the BLDC windings being energized on the rotor position measurements with the Hall sensor. I found some unclear explains stating ...
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1answer
184 views

How to sense RPM from 4 pin BLDC motor?

The title says it all. I'm doing a project with a spinning HDD disk with a slot cut in it, RGB LEDs, and precise turning on and off of the colors. I'm planning to glue a magnet and use a hall ...
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1answer
106 views

ESC scheme ADC problem

I made own ESC board. Here is schematics: First, I implemented the cycle of 6 combinations of switching signals: A_H, A_L, B_H, B_L, C_H, C_L in loop using delay time before switching to next ...
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2answers
178 views

Need help with the BLDC drive inverter circuit problem

I am building a BLDC drive circuit for a 24V/60W BLDC motor. I chose SI4564DY(P+N) and FAN3278 to realize it as shown below (I only include A+ and A-, B and C are exactly the same). The FB indicated ...
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1answer
83 views

Brushless motor not turning

I'am trying to build a drone. Therefore I bought some brushless DC motors This is the only specs I have for the motors : ...
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1answer
332 views

How do brushless motors provide more torque and longer battery life to cordless drills?

I was in the market for a cordless drill and came across a drill manufacturer claiming higher torque and longer battery life since it utilized a brushless motor. Is it true that brushless motors tend ...