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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20 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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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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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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23 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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34 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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12v ride on toy car tripping breaker under normal load

After sitting idle in the garage for a few weeks, my daughters ride on toy car wouldn't move. Changing the battery with a relatively new one did not help. I tracked the problem down to the shifter (...
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84 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
153 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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80 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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42 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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824 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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245 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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43 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 ...
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53 views

How to estimate brushed motor usage (age) from carbon brushes corrosion

Is there a model to estimating the total number of turns a brushed motors has made during its life if we know that the carbon brushes have corroded by x mm or mm^3?
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Motor only works with alligator cables

So, I’ve run into a weird issue while trying to hook up a voltage controller box to two linear actuators. The voltage controller box receives an input of 12V and outputs 12 or -12 depending on what ...
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90 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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73 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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130 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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513 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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272 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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60 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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156 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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151 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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140 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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183 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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101 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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1k 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 ...
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3answers
664 views

Where to place a capacitor to prevent arcing in a brushed DC motor?

I always thought that if you want to reduce arcing in a motor commutator, you should put some capacitance across the motor terminals. But recently, while reading application note AN905 from Microchip, ...
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409 views

brushless vs brushed motor [closed]

I'm currently making a radio controlled fighting robot and have pulled apart some drills which have a brushed RS550S DC motor (0.5Nm 18V 60A so 1080W) and a gearbox attached. Right now I'm looking at ...
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523 views

Brushed DC motor as generator, characterising the motor

I've read through the several topics here concerning using a DC motor as a generator but I've failed to answer my question so, apologies, I'm going to ask again. I need to use a small DC motor as a ...
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248 views

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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221 views

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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227 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 ...
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1answer
919 views

Tension control using a DC motor

I would like to control the tension of a string attached to the armature of a DC motor. I think the StackExchange thread here does not fully answer my question. Here the schematic (pencil sketch) of a ...
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2answers
627 views

What determines the continous ratings of electric motors?

I've seen variations of this torque-speed curve for brushless DC motor performance, and I'm curious what criteria determine the rated torque and speed of permanent magnet DC motors in general. Does ...
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2answers
67 views

Constant static thrust from a brushed motor powered by minimal weight rechargeable battery

I am trying to design a circuit for a device that will only run for around 20s at a time. For that 20s, however, I need to power two brushed motors (with connected propellers) that together pull ...
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314 views

Need filter design to increase DC motor brush life

I have an application which uses 120 VDC 1/4 HP motor and has poor brush life. Presently just using a simple bridge rectifier to convert 120 AC line power to 120 DC. I am wondering if adding something ...
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340 views

Serial diode to universal motor and brush lenghts differs on intermittent run, why?

A universal motor supposed to be run in two speed stages: full speed / reduced speed and motor will run on intermittent duty like 3 seconds ON / 3 seconds OFF. So simply I added a serial diode (BY255)...
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1answer
1k views

How to connect a 2.4ghz 4ch RC receiver to a brushed dc motor controller?

I currently have a 36vbdc 800w motor connected to a 36v 800w motor speed controller (similar to what they use to control ebikes) just like this one: https://aws.robu.in/wp-content/uploads/2016/02/...
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Does resistance of carbon brushes in DC Motors decreases after couple of uses?

I know that after couple of uses DC Motors we should replace carbon brush because the physical size of carbon brush will be reduced and it can not do its job! But let me ask my 3 main questions.... ...
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47 views

When I connect 2 motors to a battery do the motors share volts or amps?

That is, when I have an 8.4 v 3000 mAh battery connected to two of the same (DC) motor, is each motor getting 4.2 volts, 1500 mAh or both? Or am I just super confused?
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71 views

Syncing Multiple Motor Drivers

I have put together a 4-axis robot operated by brushed DC motors for a haptic feedback system. Unfortunately I am not well versed in robotic control systems so would really appreciate any advice you ...
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665 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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48 views

How did rotary converter commutators conduct electricity?

I've been reading about rotary converters and examining photographs, but I've noticed that nearly all have a very strange (to me) commutator design. It looks like a piece of wire screen rather than ...
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1answer
102 views

Brushed motor VS BLDC [closed]

Our brushed DC motor is rated for 3-4 amps and can be overloaded for 8+ amps. We are currently changing the brushed motor for a brushless (BLDC) motor, rated at 3.5 amps. How much can I overload the ...
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420 views

Vibration motors burning out under PWM control

I have 16 dc vibration motors bought from Ali, rated at 0.1A, Vdc 3-9v. In fact they consumed 0.15-0.18A from 9V. Starting resistance varied from 20 to 30 ohms. I connected all 16 motors to PCA9685 ...
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61 views

Brushed DC motor chassis connected to each terminal

I'm attempting to build a cart which will be steered with two deferentially driven electric motors. The motors I've chosen are and brushed DC worm drives, mainly for the high torque and low price. I ...
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2answers
222 views

Replace a brushed motor with a Resistor (+ Diode)?

My first question at this forum was put at hold because initially was bad formulated and never get to normal in spite I had edited the question, so hope more luck now! Once I am a noobie at ...
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1answer
794 views

Configuring BLDC motor for low-speed application

Given: I need to the simulate sinusoidal forces on a wind-tunnel model using a bench-top setup. I've designed a rig where I spin a load at high speeds to generate centrifugal centripetal forces, and ...
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657 views

fly back diode for use with DC motors

I asked a question the other day but am still unsure, I just bought a 0-30v 0-5A dc regulated power supply today and want to use it to play around with various DC motors, I was told I didn't need to ...