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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.

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18 views

Motor Driver for gimbal brushless motor?

i want to make a 3-axis gimbal but dont know what motor driver or esc to use for slow speeds and have it be able to connect to an arduino?
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48 views

Rotation mechanism working in 50mm tube with 100Nm rated torque. Is it possible? [on hold]

I'm working on mechanism for tightening ropes of suspension bridge. In current design it should be electrically powered, fit in a tube with small diameter ~50mm and have continuous torque of ~100Nm. ...
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1answer
59 views

Running a 36V motor controller on li-ion [on hold]

I recently bought a 36V BLDC motor controller (the $10 ones from ebay) without taking into consideration that when fully charged my battery voltage is actually 42V. I found a similar question where ...
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why do the large industrial lathes, 1 HP upwards still use induction motor and not BLDC?

I'm trying to find an answer as to why exactly larger more powerful lathes still have 3 phase AC induction motor. All the benefits of a BLDC seem to far outweigh the use of an induction and they seem ...
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1answer
62 views

Purpose of an Electronic Speed Controller(ESC)

I need to implement a brushless dc motor and I know the motor needs to need constant control to ensure that consistent torque is applied to the rotor. What control does the ESC provide and what ...
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1answer
20 views

Why isn't \$I_s\$ (resultant current phasor) zero in FOC of PMSM?

Suppose I have 3 phase (A,B,C) star connected PMSM. For running this motor with FOC the \$I_s\$ (resultant current phasor or \$I_a+I_b+I_c\$, where \$I_i\$ is current in the phases) is keep at 90 ...
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2answers
37 views

Physical principle of the torque of DC and BLDC motors

I have watched several videos about this topic. According to these videos, the torque of DC motors relies on the Lorentz force (a force that acts on moving charged particles in a magnetic field). ...
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1answer
27 views

How to know how many phases a BLDC has?

I have a quick question, how do I know how many phases a BLDC has? For example, an E-bike motor kit has three motor wires: yellow, green and blue. It also has three wires for the hall effect sensors: ...
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24 views

Modeling a BLDC motor on Simulink

I am trying to model a BLDC motor on simulink. But after doing some researches I found out that it is easier to model the BLDC motor like a DC motor. How realistic can this modeling be? Supposing ...
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3answers
49 views

Brushless DC motor values at voltage other than nominal

I am currently using a maxon three phase BLDC motor (datasheet PN:412825) that is rated for 48 volts (see spec sheet below). I am running the motor at 18.5 volts (requirement for my application). I am ...
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22 views

sensorless/sensor FOC in bldc motor

In all the papers of FOC of bldc motor, 1st rotor angle is calculated then current in the armature is applied such that the current vector becomes perpendicular to the rotor angle. What is this rotor ...
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1answer
18 views

BLDC Motor Field Flux Direction

In a 2 pole BLDC motor i can see the net direction of the field flux (coming from north pole and going towards south pole). But in 4 pole BLDC motor what will be the direction of the net field flux? I ...
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4answers
1k views

Can a DC brushless motor produce the same torque at different power levels?

I am looking these Neo Brushless motors for a project. Here are the links to the data sheet and also to stall testing from the company: http://www.revrobotics.com/neo-brushless-motor-locked-rotor-...
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2answers
44 views

What happens to the torque/speed curve of a brushless motor when I increase the voltage?

Here is a an image of the torque/speed curve. My guess is that increasing voltage will simply translate the curve up because the slope is the torque constant, which is a physical motor property that ...
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1answer
58 views

Does increasing voltage increase the torque of a brushless motor?

1.) I have a brushless motor with testing data at 12V. I want to know if I increase the voltage supply, will this increase the torque? In my research I keep seeing "current controls torque, and ...
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28 views

How to select power source for robot actuator with known torque requirement

I am building a robotic actuator that will be backdrivable, this robot will have pretty low RPM. I will be using brushless DC motors. I am trying to figure out requirements for the power source. I ...
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3answers
88 views

What are the bottom group of diodes for on BLDC motor control circuits?

I'm studying the control circuit for a BLDC motor and I can't figure out what function the diodes serve that I point to in the basic diagram. What are they for? At what point in the basic operation ...
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0answers
38 views

Strange behavior from single phase BLDC

I've recently been working on a pump that contains an impeller controlled by a simple brushless motor driver. The driver is very similar to one for a 12v fan which makes sense as the pump is part of a ...
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34 views

Brushless DC Control

I'm controlling a brushless motor using a raspberry pi. I use servo pulsess to control my motor. But i also need to turn it in the reverse direction. To do that, I have no idea what to do. Some say ...
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2answers
119 views

DMG4800 MOSFET running hot (while Si4804 runs cool)

I'm working on a BLDC control system for a micromotor, and have been using the Vishay Si4804 MOSFETs in output stage. Due to availability issues, I ordered Diodes Inc DMG4800LSD-13 for a second board,...
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1answer
47 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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0answers
38 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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1answer
39 views

ESC Output Current for a Brushless Motor with a Given Max Current Rating

I am trying to power a brushless motor with a max current consumption of 12.5 A (specified in datasheet). How should I figure out the maximum current drawn by one of the phases of the ESC? Should I ...
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1answer
73 views

If I increase the number of motors in a parallel circuit, will my current increase? [closed]

I am new to electronics, and am looking to build my own quadcopter. Before I purchase anything, I want to make sure I can get an appropriate battery to power the motors. The battery I am looking at ...
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0answers
43 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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3answers
180 views

Can AC synchronous motors be controlled with VESC?

I want to drive something like these ac synchronous motors: Small Mige: https://www.alibaba.com/product-detail/Small-Mige-130-series-1KW-best_60394196285.html?spm=a2700.7724838.2017115.13....
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1answer
45 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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1answer
108 views

4 Phase 5 Pin high speed motor driving (turbomolecular pump driver)

I just recently purchased a broken Turbomolecular pump from eBay and repaired it, now that it works again I need to build a low-cost driver for it. It has 4 Phases and normally relies on hall ...
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1answer
43 views

Motor for large speed range

I am designing a chuck for which I need a motor which can go from 200rpm to 5000rpm. I tried a 1000KV BLDC with 12V supply, but the minimum rpm was around 1800. Also, I am not sure whether stepper ...
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1answer
79 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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3answers
134 views

Problems with dc motor driver design: Mosfet fail

I made a brushed dc motor driver. The motor speed is controlled with PWM (from an Arduino). The motor that I'm using draws 3 amps without load. This is the schematic: As you can see there are two N ...
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2answers
56 views

Voltage Regulation to Brushless DC Motor

I am using a 12V brushless DC motor (peak current 4.6A) and I would like to have speed control over it. Link to pump I am using: https://daviescraig.com.au/product/ebp40-electric-booster-pump-12v-...
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2answers
52 views

Infinitely linear torque with current in motor?

I'm trying to find the maximum current my brushless DC motor can handle. If I can keep the coils and cabling cool (in a freezer right now), is there any other fundamental limit I may hit such as ...
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1answer
34 views

Can analogue Hall sensors be used in BLDC for static angle measurement?

Everything I have read on using Hall sensors with BLDC motors appears to use latching hall sensors which provide repeatable latching angles as the magnetic fields change at specific angles. I am ...
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2answers
58 views

Brushless DC motor steady-state performance modeling

For a brushed DC motor, there are the well-known differential equations describing the electrical and mechanical behaviour: \$V_a-i_aR_a-L_a\frac{d}{dt}i_a-k_e\omega_a=0\$ \$k_ti_a-J\frac{d}{dt}\...
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55 views

Changing push-pull transistors in brushless motor driver

I am fixing a brushless motor driver that has 6 MOSFET transistors, 2 transistors for each coil. I have found that SW5 is burned so I changed it and everything now works well. However, I have heard ...
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2answers
83 views

Can I Move a wheelchair with two outrunner motors? [closed]

I am trying to turn a wheelchair electric and want to use a VESC to do so. However, I was wondering if an outrunner brushless motor with a belt to a larger gear would be effective and could move the ...
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46 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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1answer
121 views

Brushless motor back and high current and IC

I'm trying to replace the brain of my neato vacuum which is broken. I've already repair a cleaning MOP but with this one I have a problem with the brushless motor which is throwing some party fun in ...
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2answers
141 views

Trapezoidal vs sinusoidal BLDC motor, back EMF speed caclulation

First of all do these motors differ electrically and if yes, how? Can you measure BLDC generator speed using back-emf independent of its waveform type?
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2answers
74 views

Cannot run BLDC motor at peak current and low RPM

I have a hub motor: https://www.uumotor.com/4-5-inch-350w-hub-servo-motor.html I know that the motor requires 12A but I can only supply 2.5A using my motor controller. The problem I have is when I ...
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0answers
32 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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0answers
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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2answers
45 views

Circuit Analysis Involving DC Motors

When it comes to simple circuit analysis, there is millions of tutorials on how to analyze a resistor circuit, a RC circuit, or those involving LED the non-ohmic devices. However, I did not find a ...
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0answers
19 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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35 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
89 views

What is the state space model for a BLDC motor

I wanted to model a brushless DC motor so that I can add controllers(PID ) to correct the transient state behaviors. I started to model my BLDC and I found some model. Then I used specs from MAXON ...
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1answer
40 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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0answers
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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2answers
140 views

Cheap alternative to limit inrush current (eg. relay bypassing a fixed resistor or MOSFET)

I'm editing the question because several (great) answers focus on the fact that the LTC3780 module (inside ajustable my power supply) can handle the inrush current (maybe, maybe not). I'm glad to know,...