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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Convert motor speed to motor torque [on hold]

I have motor speed as input in my math equations I want to convert them into torque because i want to control the torque not the speed There is any relation can help me use torque instead of speed? is ...
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15 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
47 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
49 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
50 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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38 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
45 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
42 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
79 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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30 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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132 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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25 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
78 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
76 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
53 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
71 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
36 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
87 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
35 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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73 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
45 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
168 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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170 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
89 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
75 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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43 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
106 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
53 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
57 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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148 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
90 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
96 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
146 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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152 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
46 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
112 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
233 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
52 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 ...
2
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1answer
170 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
111 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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125 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
52 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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1answer
91 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
162 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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1answer
162 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
190 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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159 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: ...