Tagged Questions

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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2answers
60 views

bldc crashing after '0' cross detection

I'm designing a BLDC driver (sensorless) using the the KL04 microcontroller. I am implementing a zero cross detection for commutation of the states. The flow I am implementing is: duty cycly = 30%. ...
0
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2answers
77 views

Why do AC motors have various back EMF shapes?

I just saw in one of the threads that apparently, a permanent magnet synchronous motor and a brushless DC motor have different back EMF shapes. But why? I thought those two were exactly the same in ...
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1answer
64 views

DC motors, AC motors, and Kv

As I understand it, DC motors have Kv values because their speed is determined by the applied voltage. AC motors don't have Kv values because their speed is determined by the frequency of the AC ...
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1answer
29 views

Does the peak torque decrease at rated speed for BLDC motor?

Does the below BLDC motor have the same Peak Torque(short time) at the rated speed? Rated_Voltage: 24V Rated_Speed: 4000RPM Back_EMF_Constant: 3.7Vp/KRPM Peak_Current: 4.4A Peak_Torque: ...
0
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1answer
22 views

Question about Intermittent Torque Zone and Rated Voltage

In the below two diagrams, the Intermittent Torque Zones are different, figure 1 is triangle and figure 2 is rectangle. I don't know which one is correct, is there something related to motor's rated ...
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2answers
37 views

What factors can determine the constant coefficient when calculating torque?

In this servo motor's datasheet, both motor have the same torque of 0.32 Nm, have the same power of 100w, but have different rated currents and voltages. It seems that the "torque" relates to the ...
1
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0answers
54 views

Stepper motor to replace brushed DC motor to be used to start a gas engine?

I'm trying to decide if it would be possible to use a stepper motor to replace a current 12V DC brushed motor that is used to turn over a small (~149cc) gas engine for starting. The reason why is, I ...
1
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3answers
137 views

What does manufacturer call PMSM motor?

It is easy to find BLDC motor manufacturers on google, but it is difficult to find PMSM. Maybe there is a terminology issue here. There are many "Brushless Servo Motors" or "Synchronous Servo Motors" ...
1
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1answer
391 views

HDD Motor Spinning

I'm trying to run a hdd motor using the following link. http://theamateurprogrammer.blogspot.hk/2014/02/revitalizing-old-hard-drive-motors.html Instead of using Audrino I'm using PIC16F73.I tried to ...
0
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1answer
84 views

High Torque Brushless DC Motors in Small Package

I have a particular set of requirements that call for a relatively high stall torque for the space available (300 ozf-in for < 8cm length of motor). The motor would be operating at a relatively low ...
0
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3answers
91 views

controlling 3x BLDC motors

I'd like to control 3x L6234 IC's (3x BLDC motors) with the cheapest microcontroller/board/lauchpad but I'm a bit confused about the requirements needed for the microcontroller. As I understood each ...
0
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1answer
66 views

Am I misunderstanding the specs of this solar panel or electric motor?

I've been trying to figure this out, but the answers I've come up with thus far have been counter-intuitive. The solar panel's specs are as follows: ...
0
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1answer
92 views

How do I control a brushless DC motor without an ESC with Arduino

Is there a way to control brushless DC motor removed from a CD-ROM drive without using an ESC by using an Arduino.
0
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1answer
45 views

BLDC waveform abnormality

I am designing a DIY BLDC ESC. I am able to detect the '0' crossing correctly (for the BEMF approach). It locks onto the '0' crossing (1.jpg). Then it stays good for a couple of iterations (2.jpg). ...
0
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0answers
28 views

3-phase BLDC motor operation

I salvage motor from HDD, then I started googling around how to make it spin and found this video(there are good subtitles in English): https://www.youtube.com/watch?v=CMz2DYpos8w Here he just plug ...
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2answers
58 views

Contactless electrical connection

I will have a carriage sliding over a round metal shaft and the linear bearings will not necessarily be conductive. I want to calculate the position of the carriage by measuring the resistance from of ...
0
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1answer
37 views

Safely Driving a Brushless Motor

I am currently building a quad-copter out of an Arduino. I decided to make my own ESCs using MOSFETs, EMF sensors, and the Arduino. These are the motors that will be driven: ...
0
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1answer
65 views

Which kind of motor would be better for an electric solar car, geared or non-geared?

My friends and I are working on an electric solar car. We want to know which kind of motor we should use: Geared or non-geared? 1kWh is the maximum power limit for motor which we can use to drive our ...
0
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0answers
38 views

Is the servo motor made of BLDC motor?

For example, the panasonic A5 family servo motor: Rated output(w): 100w; Rated torque (N*m): 0.32; Size: 38mm*32mm I guess it is made of BLDC, because the typical 100w AC motor must be much larger. ...
1
vote
1answer
72 views

Suppressing BLDC Motor noise? Is it radiated or a grounding issue? [closed]

I have a BLDC motor that rotates an imaging assembly(ultrasound) and alot of PWM noise can be seen in the resultant image produced. If I play around with the RX line that carries the imaging signal ...
0
votes
1answer
54 views

Three phase motor current verification

I want to verify that the quadrature current through a permanent magnet synchronous motor (PMSM) is actually the same amount as I commanded the field-oriented control (FOC) motor controller to push it ...
0
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3answers
116 views

Torque and Back EMF Waveforms of Brushless Motors

For simplicity, I'm going to be talking about a single stator phase. I understand that torque is proportional to current, and that back EMF is proportional to angular velocity. However, after ...
0
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2answers
176 views

Controller for a Brushless DC motor (with ESC)

I have one of those BLDC Motors which are used in quadcopters and also an ESC to control it. I give it a PWM signal and it outputs the necessary condition for the motor to spin (AC signal). The first ...
0
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1answer
90 views

Powering a DC car vacuum cleaner with a brushless motor for better performance?

I'm making a self autonomous vacuum cleaning robot for a project and I need a vacuum cleaning mechanism to install on the robot. The problem I'm having is with figuring out how to make the vacuuming ...
1
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0answers
127 views

BLDC motor control PCB

I am trying to make a PCB to control a Sensorless Brushless motor. I just wanted to know if it looks right. The IC I am using is a TB6588FG it has a 2.5A peak output current. I want to use it with ...
2
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3answers
243 views

DIY current-limited 40A+ power supply to emulate LiPo batteries

I want to do some experiments developing brushless DC motor control hardware, and maybe wiring my own motors for my own edification. LiPo batteries aren't convenient enough, and I want ...
0
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2answers
95 views

Will brushless fan speed depend on amperage?

I am not a technical guy and have no knowledge in electrical subject. I use brushless fans in my regular day to day activity. We use them for pellet stoves and hence my question: Will amperage ...
0
votes
1answer
104 views

3 Phase Motor Rectifier

I have a Turnigy Rotomax 50cc engine and I am trying to rectify it. I don't know whether it has delta or a wye winding style but I suspect that it is delta(Left Picture). This is what I have so far: ...
0
votes
1answer
50 views

Selecting MOSFETs for Motor

I want to implement a driver circuit for a (sensored) motor that I am purchasing which has the characteristics (on the shopping website): Max Amps: 16 Max Power: 350W ESC: 35A KV: 1900 The ...
0
votes
1answer
78 views

Encoder sampling rate realization

I know that questions from a mechanical engineer might sound a little naive to you :), but here I go: I am trying to use an Arduino Uno as the brain for a DC brushless motor that we have for a ...
2
votes
2answers
227 views

Connecting 4 ESCs in parallel

Background: I'm building a quadrocopter. In such RC models, usually brushless engines are being used and these require ESCs (Electronic Speed Controllers) to work properly. Most ESCs are equipped with ...
4
votes
2answers
183 views

Electronic Speed Control Concepts

I am a programmer who has never worked with electronics before. I am learning the concepts and hoping to build a quadcopter, with the control software entirely written by me. Motor control seems to be ...
1
vote
0answers
108 views

BLDC zero-cross issue

I am trying to develop a BLDC motor ESC (electronic speed control) for motors in water. This means that the motors will be subject to more load (due to the water). I am going for the sensor less ...
0
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0answers
58 views

Wiring of ESC to Motor just plays tune

I have this ESC. I am not sure if I have the leads connected correctly, but when I power the esc and send it signals it doesn't move. I am writing to it as a servo via an arduino. What it does do ...
1
vote
1answer
788 views

Controlling a brushless DC motor with an Arduino--*without ESC*

I want to build an ESC using an ATmega328 (used in Arduino Uno). This is the Brushless DC Motor I've chosen and this is the MOSFET I've chosen to gate the power supply. It will be used to drive a ...
0
votes
1answer
219 views

Building my own brushless 3-phase motor driver to use with an Arduino

For educational purposes I want to build from scratch a PCB that would allow me to control an hard disk motor I scavenged from the trash. To do so, I was thinking about using AO3400 and AO3401 (PNP ...
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votes
1answer
52 views

how to select Dc Motor

I have air conditioning application where i want to run blower @ 1500 rpm. Motor is rated for 48-56v DC. The operation of motor is continuous mode. Let me know calculation involved here Minimum ...
1
vote
3answers
221 views

Power 4.5V Lego motor by 5V PSU, how?

It's a long story. Please bear with me as I try to describe what I intend to accomplish. I've got a Raspberry-PI controlled Lego Technics (pre-Mindstorms era stuff) construction. It uses a couple of ...
0
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2answers
248 views

BLDC BEMF not right

I am trying to build my own ESC (brushless DC controller) and I managed to get the motor running starting from a ramp to a steady PWM duty Cycle and Commutation period and these are the BEMF waveforms ...
0
votes
1answer
191 views

BLDC speed and torque control

I have a question understanding the exact commutation of the sensorless BLDC motors. My motor has 7 pole pairs. Now assuming the 3 phases are - U,V and W ( so that's U+,U-,V+,V-,W+ and W- from the ...
2
votes
0answers
169 views

BLDC motor thrust

I am trying to drive BLDC via a custom ESC. I have read that we can control the motor in 2 ways - current control and voltage control. I am using PWM to get them working. Now, I understand that we ...
0
votes
0answers
76 views

Motor startup voltage

I am trying to drive a BLDC motor using MOSFET bridge network with sensorless BEMF detection scheme. In the BEMF it looks for Vcc/2 (half of max Vcc). Now, in each state the top/high MOSFET is PWMing ...
2
votes
1answer
2k views

Calculating Back EMF from Torque Constant

I have a brushless DC motor with a torque constant of .0181 Nm/A. How do I calculate back emf (Vpeak/kRPM) from torque constant (Nm/A)?
0
votes
1answer
124 views

DC 5 Volts - 2100mAh Electric Motor Generator. How?

I have spent my entire weekend trying to locate a place where I can buy a 5 Volts - 2100mAh Electric Motor/Generator. My goal is to spin this motor up to a certain RPM to generate the 5 volts and ...
7
votes
3answers
2k views

Wind turbine generator: brushed or brushless DC motor?

I am trying to use a DC motor as a generator for a wind turbine but then there are two possibilities for the DC motor which are brushed and brushless. Which one is more efficient to use? I know that ...
1
vote
0answers
43 views

How to understand voltage change between different phases of BLDC?

Actually, it is a question about an application note of BLDC from here. (on page 30 of that material) The question is about calculation of potential of M. What I learned from book is that the ...
3
votes
1answer
274 views

Blind Driving a Brushless DC Motor BLDC

I'm looking at making a BLDC controller with an MCU, and have be reading through the atmel guide AVR444 which steps through a design and software needed for a sensorless back-emf timing controlled ...
0
votes
1answer
86 views

BLDC working driver

I am trying to drive a BLDC motor. I was driving 2 phases and keeping the 3rd phase floating so as to measure the BEMF in it. But, what I find is whatever voltage is applied on the +ve or high side ...
0
votes
0answers
88 views

How do I match a brushless motor to an ESC?

I have purchased an iPower GBM5208H-180T brushless DC motor. Configuration: 12N14P Resistance: 10.2 ohms I need to run the motor at ~1800 RPM. Here's iPower's list of ESCs. Most are rated ...
1
vote
2answers
172 views

BLDC Motor Commutation Based Speed Control

I am working on a project which has a motor to drive a gyroscope (it has quite a bit of mass, and we want it to run at 60k RPM or more). The motor we built has very low inductance. We started using ...