Questions tagged [brushed-dc-motor]

Anything related to brushed DC motors. Brushed DC motors are electrical machines used to convert electrical energy into mechanical energy. The conversion is carried out by the interaction of a constant magnetic field generated by fixed magnets or coils with the magnetic field generated by rotating coils which are powered through a mechanical commutator employing brushes to deliver DC current to the moving coils.

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Energized motor driven in opposite direction?

This question is regarding brushed permanent magnet DC motors. Suppose that the motor's output shaft is connected to a torsional spring which was at its unstretched state when the motor was OFF. After ...
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2 votes
2 answers
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How to protect my 120V H-bridge against inductive spikes and calculate and introduce dead time?

I am currently working on this design and I would like to see if I can get some feedback regarding the protection for my MOSFETs and see how I can introduce dead time as I would like to prevent any ...
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2 votes
1 answer
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Some doubts regarding electronic throttle motor

I am trying to wrap my head around the working of electronic throttle bodies. So they usually have a brushed Permanent Magnet DC Motor which actuates the throttle plate (butterfly valve) via a gear ...
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Does PWM control DC motor's speed or position? How to control DC Motor's position?

The type of motor that I am working with is a 12V brushed permanent magnet DC motor. By following this video by Mr. Paul McWhorter I was able to control the speed of my DC motor by using the ...
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Low inductance high torque motors

Internal inductance of motor windings reduces the response time of motors. I was wondering if there exists a motor type which is both high torque and low inductance? Or in other words a motor which ...
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1 answer
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How does a system measure the speed of a servo motor using brushes on the commutator?

I have a servo motor with 4 brushes on its commutator. The motor is connected to a controller that enables the user to control the speed and at the same time it has an analog RPM meter which most ...
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41 views

What's the minimum duty cycle which can be applied to a brushed DC motor?

I am trying to control the speed of a brushed DC motor by varying its duty cycle. By testing it out, I have found out that for my application it should not go above 60% of its duty cycle, this being ...
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4 votes
3 answers
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Weird speed issues with brushed DC motors in parallel?

So I have a simple system where I want to run eight large DC brushed motors (for wheels) in parallel, which should give them all the same voltage, and they should independently change rpm depending on ...
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48V 30A PWM Brushed Motor Controller

I am trying to build a motor controller for 48V brushed motor. The motor draws around 20-30A current under load and peak to 70A sometimes. I was using an Arduino to generate PWM wave around 7kHz for ...
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4 votes
2 answers
855 views

Convert a 12 V DC motor into a 24 V motor

I have a trolling motor that is rated at 12 V. I want to double the speed of the motor. If I change the armature wiring by using a thinner wire with more turns, will I able to use it on 24 V DC to get ...
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2 answers
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Driving a motor using SPST relay

I'm trying to drive a brushed DC motor of 24V and 7W (sorry I don't have the datasheet) using a power relay on a PCB using a STM32 microcontroller. My plan is to use my STM32 to control a transistor ...
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Optimal brush advance map for large brushed DC motor with active advance control

I am posting here for advice as to the procedure to construct a map from motor speed and amps to advance for a Brushed DC electric motor with realtime, fast advance control. I have built a Brushed DC ...
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Can I use any variable 0v-5v source to engage ebike controller to work as if it had a twist style hall throttle?

The hall throttle plugs to a 3 wire connector. 5v, signal and ground coming from the controller goes through the hall throttle and is reduced to 0v-4.2v for a variable speed control. My question is, ...
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86 views

Brushless motor makes knocking noise when running in reverse

I bought this off of ebay, to go into my Razor MX500 dirtbike and connected it to a 72V 20AH lifepo4 battery. After fitting the motor, it was running nice and smooth but I noticed that it was driving ...
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2 votes
0 answers
59 views

DC Motor driving large offset mass, smooth acceleration/deceleration?

I've got a large mass (0.5-2kg) on the end of a 0.5m rod. I'm trying to swing it smoothly as an inverted pendulum using some brushed DC motors with planetary gearboxes and quadrature encoders (GoBILDA ...
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-1 votes
2 answers
71 views

DC motor limits [closed]

I bought a 12V 35W DC motor, 50RPM, 15kg.fcm of torque. As it should, when it has a low load it absorbs only a couple of hundred mA. Can I raise the voltage on the motor without exceeding 35W since I'...
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1 vote
2 answers
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Understanding back EMF measurement in brushed DC motors

I have been doing some preliminary research for a project and am trying to understand how sensor-less speed control of brushed DC motors can be done by inspecting the back EMF. Where I am at with my ...
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2 answers
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How is the technique and method to determine the optimum operating voltage of a dc motor

How is the technique and method to do measurement test in order to determine the optimum operating voltage of any type of a dc motor ? as always shown to us in motor specs e.g. ...
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1 vote
1 answer
122 views

Where are the capacitors on the l298n module?

Note I am a beginner :) Looking at the l298n datasheet: https://www.sparkfun.com/datasheets/Robotics/L298_H_Bridge.pdf I noticed on the block diagram and "Pin Functions" table, there are ...
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How I can read optical encoder pulses on High RPM

I am working on a project in which I am using two DC motors with encoder but after certain speed ( my DC motor operating voltage is 24 V but when I give it more than 15V )my MCU CC1350 start missing ...
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1 vote
3 answers
447 views

Controlling a DC Motor via an analog PID circuit

I am trying to design a 1 DOF copter as in this drawing: For this circuit there is a stick connected to a DC motor and potentiometer. The potetiometer can be rotated. I need to control the position ...
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2 votes
1 answer
222 views

Why can't I power a brushed DC motor from a powerbank?

Today, I've tried powering an 8520 coreless brushed 3-5V 0.15A DC motor from a 5V/1A power bank. The powerbank is unfortunately unspecified (its old and was originally a part of a company gift bag, so ...
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What are the effects of self-inductance in a DC armature?

So, I just stopped to think that, for the armature coils, the current passing through them varies with time due to commutation. The voltage applied to different conductors in the armature varies ...
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2 answers
54 views

What's the theoretical efficiency curve of a series motor?

I'm making this post mostly to check things for another post I'll make (if I don't find any error up to this point). I'm trying to calculate the efficiency for an ideal DC series motor as a function ...
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Error while simulating the speed control of a brushed DC motor using a 555 timer and a high boost convertor using Multisim simulator

Reference paper: https://ieeexplore.ieee.org/document/6183251 I'm trying to simulate the speed control for a brushed DC motor using a 555 timer (astable multivibrator) and a high boost convertor using ...
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0 votes
1 answer
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Can a repulsion motor be connected like a series or shunt DC motor?

Recently I bought an old repulsion-start induction-run motor made by Asincron in Argentina, exactly identical to the one in this video. I can't find much documentation and information about how ...
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0 votes
1 answer
108 views

Dc motor speed measurement issue [closed]

My setup is E6B2 incremental encoder(1000pr),Stm32 nucleo-l452re-p.I'm trying to measure speed for system identification and my graphs are looking kinda odd. I tried to increase the gab "Te"...
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3 votes
1 answer
440 views

Why is the mechanical power of a DC brushed motor at a maximum at around 50% of the stall torque?

I don't currently fully understand how a DC brushed motor reaches maximum mechanical power at around 50% of their stall torque. I know that a decrease in the speed of the rotor will decrease back-EMF ...
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0 votes
1 answer
163 views

Can we mix pwm and resistor to control brushed dc motor speed?

In my car the blower motor speed is controlled by 4 valie resistor pack. I want to have fine tune speed control so I am planning to add a pwm fan speed controller ( Generic). My question is if I ...
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0 votes
1 answer
122 views

Connect motor control board's 4 terminals to brushed motor

Although I have a degree in engineering, it's mechanical engineering. In addition, I have been developing software since I graduated, so please excuse my obvious ignorance about electronics hardware. ...
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0 answers
48 views

Burned the voltage regulator of a DC motor driver,

While I check the specs and thought the driver could handle it, after about an hour of discontinuous use, the driver stopped working... I used the following : Motor Specs: 24V 250w, rated current 13.4 ...
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0 votes
1 answer
273 views

24V, 200W DC motor Control using N channel H bridge

I am trying to build a controller for a brushed DC motor. AIM:- To Run the motor at continuous load of about 8A. Rotate motor in both the directions i.e. forward and reverse. Control the speed of ...
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0 votes
0 answers
41 views

Advice dc motor for 265mm size radial fan blade

I modeled a fan (link 1 has the image) and used a drone brushless motor (KV720) for this model. My goal is to reach 2500 rpm, but the dc motor drew 10+ amps at 12 volts and 1000 rpm. When I pushed a ...
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0 votes
1 answer
53 views

Input voltage swing when starting a DC brushed motor

I am working on a circuit that include a H-bridge for a DC brushed motor. I am having problem when the system might run for a short period of time (5s) before the Micro-controller stop responding. I ...
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How to "clean" a DC brushed motor : noise on CANbus even without moving!

We have very odd problem with a DC brushed geared motor that we are driving with a classical H-bridge chopper (20kHz PWM at the moment). The motor kinda looks like a Mabuchi from an R/C car but with ...
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0 votes
2 answers
90 views

How to use braking in this DC motor control system?

I am running a DC motor through a DC controller(DC60DP500-800BL-R01 Keya PWM Electric Vehicle Controller) in a lifter. It's working fine but the only problem is even after stopping the motor the ...
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1 vote
0 answers
132 views

Circuit of a PWM DC motor speed controller for a 12V 10A DC motor

I saw many circuits for this, most of them were using 555 IC, I wanna use a 12V 15A switching power supply for this motor, so I need a high current PWM speed controller but I don't know how to design ...
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1 vote
1 answer
63 views

How to test a motor?

I have two motors: 24V Mabuchi RS-385PH (liftgate latch) 12V Mabuchi FC-280PT (door lock actuator) How to know if they are working properly (clockwise and counterclockwise)? *I have a multimeter.
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0 votes
2 answers
533 views

Using a motor as a brake

I want to use the motor of an electric vehicle as a brake. It is a 36V ~27A motor. I looked up 500W+ resistors and they are quite pricey, I figured the cheapest alternative would be 100W resistors in ...
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0 votes
0 answers
51 views

Half bridge IC PWM not working properly

I am trying to use an A3916GESTR-T half-bridge to drive a brushed DC motor however I am running into several issues. The largest of these is the fact the output of the half-bridge does not match what ...
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0 votes
1 answer
83 views

Locked Anti Phase PWM and BLDC makes sense?

Locked Anti Phase PWM is used to drive brushed DC Motors, but does it make sense to use it for a BLDC, e.g. 3 Phase Motor?
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Problem calculating winding temperature in a brushed DC motor

I'm building a rig for measuring pull out torque for stepper motors, and am looking at dynamic braking and plugging of a permanent magnet DC motor which will be used to apply a variable braking torque....
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0 answers
188 views

Current limiter IC for motor driver

I'm using a full bridge motor driver to control a brushed DC motor. The motor driver can provide up to 20A at 24VDC and I'm using 24VDC, 200Ah AGM batteries. The driver offers the possibility to ...
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1 vote
1 answer
739 views

Back EMF protection on bidirectional DC motor controller

I am trying to design a circuit using the TB67H450FNG,EL motor driver ic to control a 6v dc motor that will be run bidirecitonal and run in 1 second pulses. due to being bi directional I am unsure of ...
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0 votes
2 answers
154 views

How to select a DC motor parameters

I would like to know how to calculate or select DC motor parameters when knows some parameters. Knowing parameters: Speed range: -2000 to 2000 rpm Torque range: -65 to 80 Nm Expected friction torque:...
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1 vote
2 answers
194 views

Control design for a brushless dc motor

I want to perform a speed control for a 1500W brushless DC motor. The documentation and videos I've seen use arduino uno and are for smaller engines. I would like to carry out this project without ...
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0 votes
1 answer
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What is the exact formula relating a DC motor's input voltage and torque produced?

I'm trying to control a 12V geared DC motor with encoder through an Arduino by an L298D driver for my self balnace bot. Based on the angles from the attached gyro sensor and encoder, it calculates ...
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0 votes
1 answer
325 views

Calculating Rotor Inertia or Mechanical Time Constant for BLDC Motor from Published Specs Only

TLDR - Is there any way of calculating the Mechancial Time Constant and/or Rotor Inertia and/or Run-Up Time based soley on the specs provided on this motor My end goal in asking this question is to ...
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0 votes
1 answer
57 views

VNH5019 motor controller

So I want to use the VNH5019 motor Controller shield for the Arduino Uno for a project. My question regarding this is the voltage of the motors. Since they differ from motor to motor I'm not sure ...
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4 votes
3 answers
204 views

Homemade DC generator isn't outputting much voltage

I'm new to electronics and I've made a permanent magnet brushed DC generator, but when I spin it (using a drill to get high RPM) I get an output of less than 1 volt. I've used it as a motor and it ...
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