# 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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### 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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### 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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### 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"...
268 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 ...
581 views

### PWM Brushed DC Motor Noise

I am driving a brushed DC motor (internal to a linear actuator) off of TI DRV8872 motor driver. I am PWMing the motor driver at 20kHz and varying duty cycle to control the speed. The problem is that ...
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### 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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### 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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### Confusion about Diagnosing Problems with a Commutated (Brushed) Motor

Recently I have been "brushing up" my knowledge of commutated (brushed not electronically commutated) motors. I came across this short video describing tests that can be done to diagnose wound rotor ...
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### 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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### DC motor armature rewinding

Question about rewinding a brushed DC motor: I've taken apart a DeWalt router to see why I was getting so much sparking (already tried replacing brushes). While testing the resistance between ...
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### 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 ...
144 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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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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### Power supply and PWM for brushed 24V DC motor

I've got a 24V motor with these characteristics: -voltage: 24VDC - rated speed 2750rpm - Output: 200w Rated current: 10.9A I want to use it for a watchmater lathe, so I need to control the speed, ...
38 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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### 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 ...
105 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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### 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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### 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 ...
184 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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### 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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### 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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### 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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### Back driving a brushed DC motor

I do not have expertise in electrical engineering, so I may sound completely naive. I am currently trying to back drive a brushed dc motor. I am reading an analog value from two pressure sensors in a ...
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### 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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### 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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### How to determine the angular velocity of a DC motor correctly

I am given a small robot track vehicle, which uses a DC motor to power the left tracked wheel and another DC motor to power the right tracked wheel. I am using an optical wheel encoder to measure the ...
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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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### 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 ...
321 views

### Why does my PMDC motor have spikes in its BEMF?

I have two identical PMDC motors. I ran each of them on a dyno at the same voltage and the same load. They both consumed the same amount of current, yet one of them runs 300 RPM slower. The one ...
1k views

### How to specify a motor driver H-bridge (3v motor)

I am trying to choose an H-bridge to allow the use of logic for basic directional control of a three volt brushed DC motor (not PWM signals), however they all seem to have minimum voltages above what ...
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### 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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### Can someone explain how this RFI filter works?

This is an RFI filter from a 12V automotive DC motor. This motor design is over 20 years old and currently in "service" production. We just learned that the capacitor we're using is now in short ...
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### DC Motor doesn't change from lock to unlock

Can someone tell me why the motor doesn't change from lock to unlock? I designed a PCB circuit wich controlls the Motor movements and Lock. The motor has a magnetic lock. When switch to Unlock mode , ...
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### Long shunt DC motor speed control characteristics?

So from what I can see based on stuff published online: Series wound motors: Are not good for variable speed applications Can achieve very high starting torque Speed is almost entirely dependent ...
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### In a shunt DC motor, how quickly after losing the field will the armature current increase to its V/R limit?

In a shunt DC motor, what are the sequence of events when the field current is lost? From what I understand the loss of the field current, and thus the field itself, will result in a decrease in back ...
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### Brushed motor with shorted contacts can still rotate

From what I read here and on the internet I understood that shorting or adding a big load to the contacts of a DC motor will make it very hard to turn as a generator. I have a 500W brushed DC motor ...
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### Motor freeweeling and regenerative brаking FOR DUMMIES

The project I'm working on is an electrically powered vehicle. I have found this fairly simple circuit to control my motor's speed. What I understand is that when the transistor is closed the battery ...
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### DC Chopper Drive for Brushed DC Separately Excited Motor

I have a 6 pulse SCR drive, driving a large (1000KW, 750VDC) DC Separately excited DC Motor. In a typical SCR drive, the power factor improves with speed, and if the drive is to be run at 50% speed ...
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### What does the output current rating from an H-Bridge's datasheet really mean?

I bought the H-Bridge VNH7070BAS from ST because it would drive up to 15A, but when I test it, it only reaches 6A and then it shuts down. What does that value really mean? How can I get the output ...
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### Shunt DC motor controller improvement

A 1.4 A shunt DC motor, with brushes, in a home made pottery wheel from 1970s runs slightly erratically. In general I am well impressed with it as the motor choice is appropriate for the application, ...
2k views

### Connect BDESC S10E RTR

I have a brushed motor and an ESC for brushed motors Motor rating is 12V 3A. ESC is the mod in the title. I have tried so much, but couldn't find a clue to find a relation between the led blinking, ...
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### Is it possible to drive a low voltage (7V) brushed DC motor with a low duty cycle, 220V DC source?

I am trying to drive brushed DC motor rated at 7 volts in only one direction. The motor can sink high currents under load (I expect up to 20A). My genius plan is to run it from rectified mains ...
443 views

### Pre charge resistor switch

I have a 12V 40A motor. I have a switch between the motor controller and the battery. I want to put a pre charge resistor in the path. Like in the figure. My questions are: 1) The pre charge ...
124 views

### How does voltage/current limits work in switches?

I want to get a rotary switch, it says that it can handle 600 V and 40 A. I will use it to turn ON two DC brushed motors of 12 V 20 A. So, the voltage is way too high but the current is just right. ...