Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

-1
votes
0answers
25 views

Zero crossing point detection for BLDC

I have the following implementation on a breadboard to detect the zero crossing point of BEMF for sensorless control of a BLDC controller. For now I have the code only for the start-up sequence (open ...
0
votes
0answers
24 views

mutual inductance of BLDC motor

I want to use BLDC motor for charging the E-rickshaw for that I need to find the parameters of the motor. I have measured the Resistance and self-inductance of the motor but I am facing difficulties ...
0
votes
0answers
17 views

Motor-side of BLAC supply goes into overvoltage when regenrative braking using an LM5060

I am currently using an LM5060 for protection of the motor supply on my BLAC motor driver. Everything works well until I decelerate the motor quickly, this makes the supply voltage peak above the OVP ...
1
vote
0answers
15 views

3 Phase PMSM Motor Current Measurement: Figuring out the 2 negative terminal currents with 1 positive current measurement

I am trying to implement F.O.C for a PMSM machine with a custom made inverter board. The H-bridges are from Infineon (IFX007T) and they provide current sensing capabilities. The problem is, i need the ...
0
votes
1answer
56 views

Why is back emf of bldc trapezoidal?

I am trying to understand why would the back emf in bldc be trapezoidal. Lets consider a simple motor with two stator coils placed opposite to each other. Lets say a bar magnet is kept as a rotor. If ...
-2
votes
0answers
28 views
0
votes
1answer
26 views

PWM phase voltage and current measurement for power consumption calculation for a BLDC MOTOR

I have been trying to log both voltage and current from the battery of an electric two wheeler for finding out efficiency at inverter, battery level.
0
votes
0answers
121 views

I have designed and 3D printed a new motor that was based on a video i saw earlier, however motor keeps stuttering and wont turn, what went wrong?

Figure 1 Figure2 I started by doing 150 turns on each coil making sure they were winded in the same direction, then connected the starting point of each coil together and took each phase winding to ...
2
votes
1answer
51 views

Powering 36V motor with 48V LiPo battery through a motor controller [closed]

I am planning to use 36V BLDC motors from a hoverboard, (this one) with this motor controller. The controller mentioned can handle up to 50V, 60A continuous. I would appreciate it if someone can ...
1
vote
1answer
51 views

How to power an electric motor

I would like to attempt to assemble an outrunner BLDC motor from scratch. Its working principle seems ridiculously simple and I'm up for the challenge. There is one thing that I would like to clear up ...
1
vote
1answer
45 views

BLDC controller MOSFET heating problem

I am using schematic to controll a bldc motor without sensors. As gate drivers I am using IR2101 and also I added some diodes in anti-parallel with gate resistors (not shown in the schematic) I am ...
0
votes
0answers
31 views

BLDC hoverboard motor with no specifications

I have this kind of motor but I can not find any electrical specifications about it. All I know is that is a 36V,250W BLDC motor. How can I determine the number of poles, the coil resistance/...
15
votes
2answers
2k views

Why do BLDC motor (1 kW) controllers have so many MOSFETs?

I have a 1 kW three-phase BLDC motor from China, and I was developing the controller myself. At 48 Vdc, the maximum current should be about 25 Amps and a peak current of 50 Amps for short durations. ...
0
votes
1answer
32 views

Sensorless speed control and startup of BLDC

Regarding the sensorless speed control of a BLDC, I have some doubt about what may happen in two scenarios when the rotor's position is unknown: 1) the start-up from zero and 2) with an initial ...
0
votes
1answer
58 views

How to control 4 motors which are conected to a flight controller using Raspberry Pi?

I just started a project to make a drone without a radio controller. I want to control 4 brushless motors connected to a flight controller KK 2.1.5 using Rpi 3 B+. Obviously, the motors are first ...
0
votes
0answers
43 views

Formula for RPM and its relation with slot stator

I want to clarify a formula regarding RPM. The formula \$\mathrm{RPM} = 120f/p\$ where \$f\$= frequency and \$p\$= # of poles. But what if the motor has different slots, for example, a 24 slot stator ...
1
vote
2answers
38 views

BLDC Motor Drive control

I am using a 310VDC, 4pole BLDC motor with hall sensor feedback for my application. My objective to run the BLDC motor at 7500 rpm. My motor rated speed is 8500rpm. I am able to run motor at 7500 ...
0
votes
1answer
68 views

Why does shorting the phases of a BLDC motor cause it to lock?

Normally a motor can be locked by shorting its phases. When the motor is not connected and we short all the the three phase terminals (tie them together) and try to rotate the shaft it offers lot of ...
3
votes
1answer
72 views

What is causing these switching transients on a 3 phase motor driver?

One time I built a 3 phase motor driver, which works quite well in the original configuration. Recently, I changed the physical layout to this rectangular form factor, and now it has quite large ...
0
votes
0answers
45 views

Identification of BLDC Motor

I would to know if make sense to obtain the current of the BLDC motor, using the BLDC motor torque measurement. In particular, i'm able to measure the torque of a BLDC motor but not the current that ...
1
vote
0answers
50 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)...
2
votes
1answer
68 views

3 phase Bldc hall sensor problem

I am trying to drive a 350 watt, 3 phase, BLDC motor (DGW07-20j model) with stm32 micro controller. But I have problem with hall sensors because their outputs are not similar to the hall sensors which ...
0
votes
0answers
33 views

BLDC hall sensor output problem

The Hall sensor output is weird. First, I use 5V power supply connected to the Hall sensor power cable. Then, the outputs give me three high levels. Whatever how I rotate the motor, the output does ...
1
vote
4answers
108 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 ...
1
vote
1answer
183 views

DIY rotary inverter technical and economical feasibility

I’m setting up a solar panel system (200W) that’s used to charge batteries that will power small appliances in a converted van. Solid state inverters are expensive and difficult to fix and it seems ...
1
vote
2answers
76 views

How to determine PWM Frequency of a MOSFET to drive a BLDC motor?

What are the factors determining the PWM Frequency of the MOSFET driver circuit that drives a BLDC motor. Is there any equation for PWM calculation? For eg. I need to control the speed of a BLDC ...
1
vote
2answers
59 views

Paralleling output of multiple BLDC motors used as generators

First of all, I apologize for anything stupid I say as I am not yet well versed in the proper technical terms and schematics. I wish to use several identical BLDC motors that will be spun at the same ...
0
votes
2answers
45 views

Magnetic Flux loss in PM Motors

The PM motors specially BLDC or PMSM they get their armature energy from the permanent magnets on their rotors unlike the Induction Motors in which the armature gets its energy from the Stator ...
0
votes
2answers
86 views

Driving a 4-wire Hard Drive Motor

After reading many contradictory accounts of the "proper" method, I would like to clear it up: what is the correct method for driving a 4-wire, star configuration hard drive motor? What I have ...
0
votes
0answers
38 views

Measuring inductance of a BLDC motor

I'm trying to drive a BLDC motor typically found in a hoverboard. I don't have much information about the motor since there was no spec sheet that came with it. Only that it is a 350W, 36V motor. I'm ...
0
votes
1answer
55 views

How to find the optimal speed of a BLDC motor having hall sensors? Can we change the most efficient speed through the controller? [closed]

How do we find the speed of BLDC motor at which it has minimum electrical losses so that we design a gearing system accordingly. And can we change the most efficient speed of a BLDC motor to suit our ...
0
votes
1answer
123 views

PWM speed control of 24V DC Brushless Pump

I would like to PWM speed control a 24V 2A DC Brushless Pump using an Arduino for my nano-brewery project. I've been searching for a Speed controller on Amazon or Ebay. But, i either find brushed ...
0
votes
1answer
194 views

Difference between Field Oriented Control and Direct Torque Control

What is the fundamental difference between Field Oriented Control (FOC) and Direct Torque Control (DTC) (say for an induction motor)? Is it really the same as described in https://www.researchgate.net/...
0
votes
0answers
117 views

BLDC won't start up by itself but with some initial help

As stated in the heading, I'm currently having a problem with driving a BLDC motor with VCC being 30 V. I'm using the DRV8320S motor driver IC from Texas Instruments. It is configured in 1x PWM ...
0
votes
0answers
79 views

Mosfets heat up in a BLDC controller

I am trying to build a bldc controller. I have the following schematic I should mention that for the gate drivers I used ir2101 ICs. Everything works fine but when I connect the motor (350w ...
0
votes
1answer
53 views

Slew Rate related EMI: How relevant is it for motor control circuits ?

I am designing a 3-phase inverter board for BLDC Motor control. The H-bridges i use are IFX007 from Infineon. The mentioned IC has the possibility to adjust the slew rate. From what i have read, i've ...
0
votes
1answer
65 views

Understanding parts of this BLDC driver schematic

I have a couple of question on ST's STSPIN32F0A 3-phase BLDC driver and I was hoping someone can help me figure out some parts of the schematic. The schematic shows the STSPIN32F0A (pg. 1) connected ...
0
votes
0answers
39 views

Back EMF sensorless BLDC control

I am trying to detect the zero crossing point of back emf in a bldc motor in order to control it sensorless. Do you have any idea what detection circuit should I use. I am thinking about a network ...
0
votes
1answer
46 views

How to identify phases of BLDC motor without rotating?

I picked up a Wye-wound brushless DC motor with three leads, three wires coming out of it via a flex PCB. Unfortunately, this flex PCB has no color indication. How can I figure out which lead is ...
1
vote
0answers
102 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 ...
0
votes
1answer
116 views

BLDC Motor rotor vibrates with audible high pitch beep, but does not spin. Controlled by custom motor controller

The circuit I have built (taken from the HIP4086A gate driver data sheet found at https://www.intersil.com/content/dam/intersil/documents/hip4/hip4086-a.pdf) is: The only difference between this ...
0
votes
1answer
96 views

How to drive 4-pin fan

I've been attempting to get this 4-pin brushless dc pc fan working for some time now. It has a red (+) black (-) blue (PWM in) and yellow (tachometer out). I only want this fan running at maximum ...
1
vote
1answer
41 views

Issue with driving Brushless Motor with a MOSFET Driver

So I have been given a circuit which supposedly works. The circuit was the the one shown but with a 10k resistor where the scribbles are. Q17 is an IRLM6344TRPbF N-chanel MOSFET and Q16 is a ...
1
vote
1answer
48 views

Is this basic schema of a brushless driver correct?

So you have the "logic" part that runs at 0-5V. The controller is a microprocessor that can read out the current monitors and respond to them by changing the voltages by changing the connection of the ...
1
vote
1answer
330 views

BLDC (Brushless DC Motor) vs PMSM (Permanent Magnet Synchornous Motor)

The differences between BLDC and PMSM are very small and for what I have seen while reading about it, is not clear to many of us. Most of the articles I have read say that the main difference is that ...
0
votes
1answer
87 views

hard drive BLDC motor

I can't work out what the issue with my setup to control a 2.5" hard drive BLDC motor is. I have a 3 pole 2.5" hard drive connected to the following drive circuit, but the motor isn't spinning. ...
0
votes
2answers
364 views

What PWM inputs are needed to drive a 3 phase BLDC using the HIP4086 IC driver chip?

I am building a motor controller for a BLDC (w/ Hall sensors) using a Teensy. My circuit looks like the typical application diagram in the datasheet (https://www.intersil.com/content/dam/Intersil/...
0
votes
1answer
47 views

Dc motor as torque transducer for BLDC motor

I bought a cheap BLDC motor on some Chinese website and could not find its characteristics. However, I have A28-400 24V amp flow Dc motor with its characteristics. If I'm able to build a test rig to ...
0
votes
1answer
36 views

Brushless motor esc and voltage [closed]

If brushless motor work in 22.2 volt , if I provide the ESC with 24 volt Is there a problem ? Thanks
0
votes
4answers
108 views

BLDC Motor Performance at high altitude?

How does a BLDC motor performance change at high altitude where the air density is really low? For example, say I have a given BLDC motor with given torque-RPM performance curves. Now, I assume these ...