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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How much can I overvolt a brushless motor?

I know that motor speed depends on applied voltage, both for DC and brushless motors: I applied 12V to a 6V motor and it started running very fast... until it burnt! :-) Questions are actually two: ...
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47 views

Park/Clarke Transform and Power

I'm looking to determine the electrical power input to a 3-phase BLDC motor, driven by TI's DRV8305 motor controller. I can't use the DC power flowing into the system because I'm trying to capture the ...
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36 views

Why do I need an esc to control a brushless motor if I can use pwm? [duplicate]

I'm looking at building a drone and everywhere seems to suggest that I need to controll the motors with an esc. It seems I send a signal to the esc with pwm. If I search "pwm brushless motor" I get ...
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39 views

Current in a Brushless DC Motor

I'm attempting to design a BLDC Motor for theoretical use in an electric car and I'm having difficulty calculating the maximum current at various speeds. Is there any equation I can use for this? I'...
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68 views

External capacitor sizing on power supply

First off, please excuse my electrical ignorance as I am a mechanical engineer stepping outside of my boundaries. I am designing and building a servo motor (~180W rated power, PMDC) driven arm system....
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1answer
71 views

Why L6743D MOSFET driver is not working properly?

I've started to build a brushless driver by using some Power MOSFETs and some MOSFET drivers, in order to drive the Power MOSFETs. I have connected the chips as shown in the application circuit (page ...
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18 views

BLDC motor with shield, is this setup OK?

Does it make sense to use this motor for an overhead stirrer ? Nanotec BLDC Motor at Farnell It is runs at 24 V and is rated at 50 W (the datasheet). I would control motor speed with this shield ? ...
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37 views

How can I calculate the coefficient viscous friction of brush-less DC motor? [closed]

I want to use this equation to simulate the torque produced by brush less Dc motor: \$T=J*\frac{\delta \omega(t)}{\delta t}+b\omega+c*sign(\omega)\$. And I need a theoretical formula to calculate b ...
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48 views

FPGA based BLDC control [closed]

I am designing Zynq-7000 BLDC motor (actually 4 of them) control solution now for low voltage (7.4V/11.1V/14.7V) application - low voltage quadrotor flight controller. I want to use that dev kit as ...
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3answers
53 views

How can I calculate the inductance of brushless DC motor?

I want to solve the differential equation of brushless DC motor $$ L\frac{di(t)}{dt}+Ri(t)=V-k_e\omega$$ How I can calculate the inductance (L) of brushless DC motor?
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2answers
48 views

Why using a High and Low side driver in BLDC?

I'm working on a small project of mine and I need to implement a motor driver in order to control a 3 phase Brushless DC motor. By googling, I've read that I need a High and Low side driver to ...
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54 views

How a BLDC work

I am working on a controller for a Brushless dc motor and I watched a tutorial about this (the only one that i found and that wasn't just a demonstration), but the problem is that some thing aren't ...
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27 views

Controlling motor speed with transistors

I am new to this kind of projects. Want I want to do is to control the speed of a dc motor with an arduino. I saw that you can do this using a transistor, Connecting the transistor to the power source ...
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1answer
85 views

Why is the motor phase current like this in six-step BLDC drive?

I am using the inverter circuit I posted before Inverter in this previous thread to drive a BLDC motor. However, the current waveforms have some strange shapes that I couldn't understand. Below is the ...
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52 views

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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0answers
19 views

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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84 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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1answer
59 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
50 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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74 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
161 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
159 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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2answers
95 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
173 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
99 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
53 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
70 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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79 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
61 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
48 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
56 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
129 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
151 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
56 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
369 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 bjt'...
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43 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
95 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
79 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 ...
0
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1answer
56 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
71 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
102 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
41 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
109 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
56 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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2answers
136 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
52 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
295 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
292 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 ...
2
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1answer
113 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 ...