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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2answers
31 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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19 views

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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1answer
43 views

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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71 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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1answer
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 ...
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53 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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88 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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31 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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55 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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36 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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39 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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48 views

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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80 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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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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1answer
47 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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187 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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42 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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1answer
40 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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35 views

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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86 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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72 views

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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1answer
283 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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58 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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2answers
140 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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1answer
59 views

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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1answer
204 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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1answer
41 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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3answers
145 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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63 views

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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31 views

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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2answers
200 views

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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2answers
361 views

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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1answer
589 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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2answers
117 views

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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1answer
63 views

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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1k views

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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1answer
798 views

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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1answer
108 views

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, ...
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1answer
101 views

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 ...
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1answer
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. ...
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1answer
449 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 ...
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1answer
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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2answers
757 views

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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1answer
62 views

How to measure current on low voltage/current brushed motor driven by H-Bridge?

I have a gearbox which transforms the rotational movement to linear movement. It drives a pin which moves back and forward using a DC motor. I need to know when the pin reaches the two "end-stops" (...
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2answers
517 views

Why does an unloaded D.C. motor draw significant current?

I have a small water pump with a brushed D.C. motor that is designed to operate off a 12 volt battery. With no load on the pump the current drawn from the battery is around 3 amperes. If the motor ...
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1answer
172 views

dc motor, hall sensor 10-20VDC to arduino

I have a linear actuator with a brushed DC motor with 2 hall sensors. I intent to use the sensors to monitor the position of the actuator. The specifications of the hall sensors are as follows: Hall ...
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1answer
219 views

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, ...
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3answers
1k views

What happens if you manually turn a moving DC motor the opposite way

If I have a brushed DC motor moving at a slow speed, and I apply a force to it in the opposite direction, enough for it to rotate the other way, does this damage the motor? I have a steering wheel ...
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0answers
314 views

4 wire 9v dc motor debuging

This is the DC motor of yamaha mt1x 4 track tape recorder. The motor is not working and i would like to know maybe if i can fix it. This motor turned for a while and then it totally stopped. I opened ...
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3answers
2k views

Filtering brushed dc motor PWM noise from current sensor

I'm trying to measure the current through some brushed DC motors ( midwest motion S22-346F-24V GP52-079 ) using a small custom USB current sensor based around the INA226 and FT-232H. The device ...