Questions tagged [brushless-dc-motor]

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.

114 questions with no upvoted or accepted answers
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289 views

Gimbal motor periodically shaking back and forth instead of spinning

I am using the BGMC2 (http://www.rovertec.com/products-bgmc2.html) to control a gimbal motor (http://www.iflight-rc.com/ipower-motor-gbm5208h-200t-brushless-gimbal-motor-with-as5048a-encoder.html). I ...
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23 views

Aluminum Electrolytic Capacitor submersed in synthetic (PAO) oil

We are testing solar water pumps which have the 3phase inverter for the BLDC in the down hole pump. The boards (one power board, one controller board) are submersed in the lubricant oil that is used ...
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78 views

HIP4086 Driver Failing After Connecting to BLDC Motor

Update: A Renesas Tech pointed me to the documentation for the HIP4080, which is basically a two leg version of the HIP4086, but with much more thorough documentation. I now have three working ...
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208 views

Sensorless FOC position observer error

I am designing my own FOC (field oriented control) system, and I am trying to implement sensorless control. I have successfully implemented sensored FOC with my system on two different motors using ...
2
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1answer
220 views

Tuning PID coefficients for stationary stability of brushless DC motors

I'm using a commercial off-the-shelf brushless DC motor controller. It combines a PID controller and an absolute encoder to regulate position. When my motor reaches its target state, it generates a ...
2
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1answer
639 views

High side RC ESC switch

I've been designing a test bench for RC propulsion systems and for that I thought it would be nice to be able to switch the power to the ESC on/off. For this I designed a simple circuit which I ...
2
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1answer
867 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 ...
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1answer
399 views

Can half-bridge current limitation in BLDC Motor controller cause MOSFET destruction?

I’m developing a motor controller based on a dsPIC33EP64MC504 from Microchip. The motor is a brushless permanent magnet synchronous motor of about 500W on 50V. The controller is based on an SVM ...
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34 views

Nonlinear Observer Question for BLDC

I'm looking at the article posted here, and I'm trying to figure out what it is that they're controlling and how. Specifically, Dave Wilson from TI gave a presentation called "Teaching Old Motors New ...
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35 views

3-phase BLDC motor resolver problem

I am trying to drive a 3-phase BLDC motor with FOC and have some questions about obtaining resolver offset angle. In the driver I used ABC notation for phases and FOC accepts A phase as 0 angle ...
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1answer
51 views

FOC electrical angle offset calculation with absolute encoder

I'm currently developing a motor controller with FOC (Field Oriented Control) and I have some trouble with the offset calibration of a motor. What I actually do to calculate the offset: I inject a ...
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0answers
40 views

Input of BLDC motor

Among the brushless DC motor, is there a motor with two input wire? I thought that bldc motors with hall sensors should have 2 input, but it was hard to find such one. Is it wrong concept about bldc ...
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25 views

How to Implement this BEMF Observer

I'm using the lecture by Dave Wilson at TI to implement a BEMF observer. I have the motor winding currents for phase A, B and C. I also have the Bus Voltage I also am in the stationary reference ...
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54 views

BLDC bemf shape

I am trying to detect the zero crossing point of the BEMF voltage in order to control the motor sensorless. The following picture shows the ideal shape of BEMF and in many application notes or ...
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2answers
68 views

BLDC Motor Drive control

I am using a 310VDC, 4pole BLDC motor with hall sensor feedback for my application. My objective is to run the BLDC motor at 7500 rpm. My motor rated speed is 8500rpm. I am able to run motor at ...
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75 views

SVPWM for BLDC Motors: Switching Losses vs Neutral Point Voltage Swing/fluctuation

I am implementing a SVPWM (Space Vector Pulse Width Modulation) scheme for a 3-phase inverter (3 H-bridges, nothing fancy) to control a BLDC Motor. Since one can choose which zero vectors (000 or 111)...
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4answers
140 views

How can I run my e-bike wheel on AC power?

I have an electric wheel designed for an electric bicycle conversion. By my understanding, the wheel is essentially a 48V, 1000w rated brushless DC motor. It comes with a thumb throttle and kill ...
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0answers
210 views

Three phase motor driver DC link, DC bus capacitor values

I am designing a motor driver for a three phase brushless motor and have been looking for a capacitor value for the DC bus of this circuit (C1). Most of what I have found when researching deals with ...
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34 views

How can I get/calculate simulink bldc parameters

I tried to get the parameters for a bldc simulation https://de.mathworks.com/help/physmod/sps/ref/brushlessdcmotor.html I tried to find a similar motor to the I need (500 W, 20-25 Nm, geared bldc) ...
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3answers
89 views

Difference between lower and higher current rated ESCs and electric skateboard questions

I am starting a project and would like to build an electric skateboard. Here are the specs for the parts that I have gathered so far: a. Two 90mm wheels that each contain a built-in BLDC motor. The ...
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0answers
2k views

3-Phase Inverter simulation

I'm trying to simulate a 3-phase inverter for BLDC(PMSM) in LTSpice. The problem is that drain current is way too high and also phase voltage isn't right. **New image *One leg If I put one source(...
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0answers
192 views

Low frequency PWM Brushless DC Motor Speed Control

I am programming a L293D motor driver with a BLDC motor to spin at speeds of 60-300 RPM. It is for a hybrid drone/car where I want the motors to spin slowly while having the necessary torque to drive. ...
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0answers
153 views

My BLDC motor is stuttering and I have no idea why

I'm driving 2 BLDC motors with two ESCs, the motors and the ESCs are powered by an external LiPo battery and the Arduino is powered via usb. The motors work with pulses between 1000 and 2000 ...
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0answers
358 views

Meaning of motor constants for three-phase PMSM

When looking at three-phase permanent magnet synchronous (brushless) motors, \$K_T\$ and \$K_V\$ numbers are often specified. Also, controllers for these motors typically specify maximum currents. ...
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127 views

SPACE VECTOR MODULATION(SVM) for BLDC motor

I want to run a 4 pole bldc motor(12V) using SVM in open loop. microcontroller: Infineon IDE: Keil Microvision. I have successfully generated the Space vector which starts rotating as shown in the ...
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1answer
363 views

Bldc hub motor starting torque

am designing a BLDC hub motor (48V-500W-15A max) I have designed a three phase inverter and the motor run normally with smooth rotation and as the motor start running and I apply the load the motor ...
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0answers
278 views

How can I do quicker sensorless FOC startup?

In my current implementation of sensorless foc startup I run the motor open loop using a constant current for a preset time and then try to close the loop. Currently I'm able to do this within 400ms ...
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0answers
62 views

Converting a 24v bldc to 12v

So I have been designing a brushless motor and the circuit that drives it is based off of this Texas Instruments one here. The only problem is that this circuit runs off a minimum of 24v. I would like ...
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1answer
150 views

For Brushless DC Motors would one expect harmonics to be different between Delta and Y stator windings?

Given two 3-phase brushless DC motors with the only difference being that one is wound delta, the other Y with center grounded, would I expect to see high frequency voltage-current harmonics to be ...
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1answer
2k views

Snubber circuit for 3 phase inverter designed for BLDC motor

I'm designing a motor controller for 3-phase BLDC motor. I'm using following components, Gate driver - IR2184 MOSFET - IRF540N The complete circuitry and output waveforms are available here. I have ...
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0answers
338 views

Stuttering of Gimbal Brushless DC Motor

I am trying make a Gimbal BLDC motor spin slowly (~0.2Hz). For some reason I have problems with the motor stuttering, as shown in this video. At the end of the video I also show PWM signal from the ...
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1answer
152 views

BLDC controller

I have to design a controller for three phase BLDC motor. In BLDC motor, for each hall sensor signal combination we have to to energize two sets of stator phases. But how to correctly identify which ...
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0answers
190 views

BLDC Motor and Generator, query about capacitor bank

I have 3 phase generator (believe to be Wye) which goes to 6 diode rectifier, the rpm can goes from 1000 to 5000. The output of the rectifer (50V say) has ripple on top which goes to 100W Motor ...
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391 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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1k 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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148 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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0answers
657 views

A Simple way of Loading a BLDC Motor?

I am looking for loading a 15W BLDC motor with another BLDC machine, sort of like a master slave configuration. I'm not exactly sure how the slave BLDC machine windings should be connected. One idea ...
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0answers
679 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 ...
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0answers
636 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 ...
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0answers
479 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 ...
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0answers
64 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 ...
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1answer
256 views

Cable shielding groundloop

I am trying to connect a encoder to a motor controller which runs very close to the motor that it controls (30+ amps). Due to the risk of high EMI of the motor inducing on the encoder signals, we send ...
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1answer
40 views

ESC control with Raspberry Pi

I'm trying to control some ESC and brushless motors using a raspberry pi. I used the pigpio library to control them using servo pulses. But it seems that my motors wont increase rpm after a limit ...
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1answer
39 views

Undervolting BLDC motor on electric bicycle

I plan to build a DIY electric bicycle using a standard geared BLDC hub motor (36V and 250W rated, 500W peak). To get 36V rated battery, at least 10 Li-ION 18650 cells are to be connected in series (...
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0answers
17 views

Brushless motor (Delta-wye switch or overvolting at lower current drown)

I have been playing with Motor CAD for a while and can't decide what to do. Here is my problem. I have a building a two-hub electric mountain board. I have motors that are rated for 350W 36V which I ...
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34 views

voltage multiplier DC from BLDC three phase motor

Hi there engineers and electronic experts, I'm doing some research about regenerative power from BLDC motor three phase. Motor is 1000W rated, with 3 wires for three phase output. The idea is to use a ...
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1answer
37 views

BLDC ESC Reverse Direction with MOSFETS

I have a basic hobby ESC connected to a motor, and the ESC inherently is unidirectional (without firmware changes, which I am trying to avoid). Is it possible to wire up 4 MOSFETS to two of the phases ...
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38 views

Two brushless motors mounted together, magnetic interference?

This migth be a bit of an odd question... I got two brushless motors from an old air-board. They are 350 W each and I'm thinking of mounting them together for better torque. But what would happen? ...
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29 views

BEMF and zero crossing point detection

I am trying to control a BLDC motor without sensors using BEMF method and zero crossing detection. I managed to detect the zero crossing point but I am not sure if it is correct. I read that the hall ...
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1answer
41 views

How to calculate torque of a 4-pole BDC hobby motor

I have a hobby motor that claims to be a 2200KV motor. This particular one is a 4-pole motor. Using a drill, I spun the motor at 1312 RPM. On an oscilloscope I see 1.3V peak-to-peak waveform between ...