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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Controlling a 3 phase BLDC motor with an absolute magnetic encoder

I am working on a project where the motor controller needs to be rewritten because it's not behaving properly (the motor is vibrating too much and tuning its parameters is close to impossible). The ...
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DC bushless motor position tracking in gimbals

I see that gimbal motors often are DC brushless, like this one. However, how is position tracking done? There doesn't seem to be sensors integrated and they only have 3 wires (3 phase?). Position ...
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53 views

A strange problem in BLDC motor drive: PWM frequency and duty cycle go wired

I am working on a BLDC motor controller to drive a 2kW BLDC motor with six-step control. The design has two board, one MCU board and one interver board, and the picture below shows one phase drive ...
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48 views

How to realize constant acceleration control for BLDC motor?

I would like to realize a constant acceleration control of BLDC motor so that its speed can rise from zero to target speed in a predefined time period. I understand that the motor should be able to ...
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2answers
37 views

Does a longer stator equal more torque in a BLDC setup?

I'm interested in making something like this: http://www.vivax-assist.com/en/produkte/vivax-assist-4-0/vivax-assist_4-0.php Because it looks awesome, but for the price i could buy a motorcycle and ...
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67 views

BLDC Motor : Control Speed digitally using Microcontroller

I am stuck with a logic to control the speed of BLDC Motor via Microcotroller. I have a BLDC Motor with Electronic fitted. It requires following signal to drive : +24v 0v or GND Enable ...
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3answers
85 views

Finding the number of poles in BLDC motors

I actually have a 3 phase BLDC motor ( The datasheet is not available) with 3 hall sensors. I would like to measure the motor speed (rpm). Therefore I need to know the mechanical revolution or number ...
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4answers
55 views

determining current in individual phase for a 3 phase winding brushless dc motor

I have an 3 phase brushless dc motor with no neutral wire. I measured the resistance from phase to phase and found them to be on average 0.255 ohms(between A and B, A and C, etc...all the values are ...
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47 views

Controlling brushless gimbal motor (BGM2804)

I'm using a standard board for control this type of motor (SimpleBGC), this board uses an atmeg328p e some brushless drivers. I'm writing a simple code for turn left/right with some velocity, but i'm ...
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4answers
126 views

Low-side current sensing

I'm trying to build a brushless dc motor driver, which provides the possibility to measure the currents on all three phases of the motor independently. The driver IC that I'm using (DRV8313) has three ...
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4answers
98 views

Can I drive a stepper motor like a brushless motor?

If I want to accelerate my stepper motor at maximum acceleration, can I drive it by watching the position of the rotor with an encoder and stepping the motor whenever it completes the previous step? ...
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1answer
27 views

Why is bi-directional current sensing required in sensorless BLDC field-oriented-control?

For the past few weeks I've been trying to understand Field-oriented-control for 3-phase motors. Eventually I would like to implement one. I've gone through dozens of application notes from Microchip, ...
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2answers
56 views

What kind of DC motor is this and what does the circuit do?

I've had this motor at least for 5 years (salvaged from something) and I remember it working then. However it doesn't work now (5 VDC mobile charger) and so I opened it up expecting to see just the ...
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2answers
56 views

How to control ESC (electronic speed controlling) using a micro controller.?

I found on internet in some articles that only customized ESC's for brush less motors can be controlled with a micro controller not ESC's (ESC's for brush-less motors) that available in market. is ...
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1answer
54 views

Constant RPM Low Speed Motor drive [closed]

What is the best way to drive a motor (DC/Brushless/Stepper) at a constant, yet low RPM? It must have no jitter and no drift over time. I'm aware that some gearing will be required. Basically what ...
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1answer
40 views

Acceleration time of unloaded motor

I want to use a motor to generate musical tones by spinning a disk. The disk will have optically printed sound waves on it. I would like to know how fast the motor will be able to change speed from ...
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2answers
48 views

regenerative braking

I have a 10kW, 72 V golden motor motor and motor controller. When regeneration occurs, the battery terminal voltage increases to more than 72 V. Is there any way to capture this energy to a separate ...
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1answer
69 views

Efficiency comparison between six step and FOC for a given motor

For a given PMSM motor with sinusoidal back-EMF, it can be driven by either six-step (as in drone applications) or by FOC (as in servo control). However, for a given motor and given DC link voltage, ...
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3answers
94 views

why the supply voltage of dc motor decreases when the motor load increases?

When I plot the supply voltage of a one-cell LiPo battery during the working period, I found that the supply voltage would drop dramatically when the motor is commanded to speed up. I think this is ...
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1answer
39 views

BLDC Current Driver Encountering Current Problems

The attached Schematic uses 6 N Channel Power Mosfets "IRL3303". I have wound my inrunner bldc motor with 180 windings per phase using a 26 Gauge Magnetic Wire. My motor is a 6 pole 2 magnets machine. ...
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1answer
217 views

3 Phase Voltage Inverter for BLDC motor. N mosfet getting hot. Why?

I am making a bldc motor and attached is my 3 phase current driver circuit. A,B,C represents the phases of the motor (Y winded). The sockets behing the bjt's go into arduino micro-controller. The ...
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28 views

MCP8063 BLDC driver startup problem

I am currently making a miniature quadrotor, and I decided to try the MCP8063 sensorless brushless motor driver ICs (http://ww1.microchip.com/downloads/en/DeviceDoc/20005257B.pdf) to drive my ...
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2answers
81 views

Is it safe to over-volt brushless out-runner dc motor on low load conditions?

I have a 1100KV brushless DC motor (turnigy d3548/4) rated maximum voltage 19V i want to run it at 25V assuming low load as i mostly need the higher rpm ! whats are the effects of this higher ...
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1answer
47 views

How does a moving magnetic field cause motion in the Al strip rotor?

Consider the following information: https://www.youtube.com/watch?v=7snjbmdYlDI How would you explain how the moving magnetic field causes motion in AL labeled rotor?
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1answer
78 views

How to build an Electric Vehicle (explain like I'm five) [closed]

I'm a business major investing time to learn more about Electric Vehicles. For starters, I wanted to understand the elements that come together to make a simple Electric Vehicle, maybe a scooter. I ...
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1answer
55 views

Where to find comprehensive motor control learning material? [closed]

I have ARM cortex-M/cortex-A software/hardware development team. My work involves many Linux drivers, BSPs and tuning for ARM hardware. Recently, one of my friend has started BLDC motor ...
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1answer
60 views

Stator rewind for 1929 motor

I'm trying to fix an old (1929?) AC, 60 Hz fan motor. None of what I've found is this simple (or old). It needs the stator rewound. It has only 4 posts and I'm copying the orginal windings. I could ...
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1answer
84 views

BLDC generator output current

I'm using the following BLDC motor as part of a project to generate power: http://www.rcdude.com/Cobra-C-3520-18-Brushless-Motor-p/c-3520-18.htm I'm able to spin this motor to about 3000 RPMS which ...
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1answer
37 views

BLDC motor: multiplexing in order to control more motors?

Is it possible to use a multiplexer in order to save some money ? The goal is to control up to 8 BLDC motors. I thought of a brakeout board based on the L6234 driver. I would like to run only one ...
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2answers
99 views

voltage divider — for detecting higher voltage in ADC

I am working on a BLDC sensorless motor. I need to detect BEMF Zero-cross event. My Motor is working on 24 Volt power. Now I need to detect the back E.M.F. As refered in this application note. My ...
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2answers
45 views

BLDC 3 Phases Motor wiring

I have a BLDC 3 phase 8 pole motor, with hall effect sensors, most other three phases motors have 1 wire for each phase U , V , W however this motor has two for each phase(these do not include the ...
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89 views

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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1answer
48 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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3answers
221 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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1answer
211 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
96 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
104 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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48 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
131 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
55 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
61 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
253 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
94 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
97 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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1answer
168 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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173 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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2answers
48 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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1answer
49 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
114 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
243 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 ...