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Questions tagged [dc-motor]

A common actuator in robotics; it's usually made of a static magnet (stator) and a set of moving inductors, acting as electromagnets, connected to the circuit through brushes. Brushless motors use phased clocks with electronic circuitry to generate motion.

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TB6612FNG DC Motor Driver Low Current Problem

I have a TB6612FNG pololu DC motor Driver (datasheet), and pololu 488:1 6V DC motor (motorPage). It is clearly stated that motor has 2.9A stall current at 6V and driver has 1.2 continuous current and ...
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48 views

24v dc High current variable speed Voltage regulator

I’m in need off a high current voltage regulator. I know a little about electronics, but not on an engineering level of designing stuff. I have a few stuff on scrap boards that I can use that lying ...
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3answers
647 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
67 views

Can you connect transistors directly to high voltages or is there precautions neccesary?

I understand that the circuit above will simply work, but what if the voltage input from the battery is significantly higher and the necessary voltage for the motor is high as well? Can you still ...
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19 views

Servodrive failure

Lenze make servo drive is failed only for the reason of power failure. Dc input through inverter 560 voltage input supply Why it is failed during power failure
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45 views

Is it possible to run this motor without the ESC? [closed]

https://www.ebay.co.uk/itm/Brushless-Motor-60A-ESC-Combo-Kit-For-1-10-RC-Car-Waterproof-4370KV-RC763-/153198212485 link is above .... Was thinking of using an arduino to run it ,transistors would be ...
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20 views

Which battery is needed to make this motor and esc work to high speeds and efficency? [closed]

I purchased this motor , ESC and battery separately and the motor did not turn even though the beep signifying everything was ready occurred. I later fried the ESC and gave up .But i have came ...
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1answer
31 views

What's the easiest way to implement portable current measurement for a ~200W dc motor?

I'm tinkering with an electronic skateboard build and I'm looking for a way to do some current measurements "on-the-go". What's the easiest way to implement this? It wouldn't be a part of the final ...
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2answers
37 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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52 views

Multiple devices on 1 battery

My current project is a green lantern minigun prop. I 3d printed it already, im just working on the electrical end of things. I have a 12v drill motor that im using to spin the barrels. also in that ...
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1answer
34 views

L293E, voltage difference exists between output 1 and output 4, yet it can't drive a small motor

I'm using L293E to drive one motor in two direction. Output 1 and output 4 are connected to the motor and I alternate Input 1 (1A) and Input 4 (4A) between VCC and GND. (never input1 == input4). Vs ...
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4answers
52 views

Creating higher voltage from DC motor?

Is it possible to take a regular dc motor, use it to spin some strong magnets over some coils, and get a higher voltage than what's being used to drive the motor? I was thinking; if you're able to ...
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1answer
63 views

Battery is 12 volt and motor is 3.7 volt…will it work?

I have a battery that says it has a working current of 4.6A and rated voltage of DC 12V I need the battery to power a motor for a fan that says it has a voltage of DC 3.7V Will it work? What will ...
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0answers
47 views

How do I suppress this voltage spike/dip?

I have a system that's currently testing automotive brushed dc motors. Occasionally, I'm getting interruptions in my data acquisition system that I believe is being caused by transients coming from ...
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1answer
32 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
39 views

Small Vacuum pump driving circuit

Please take this vacuum pump datasheet for the circuit I am planing to build. Vacuum pump datasheet I like to make a simple motor driver preferably using an SMD type MOSFET. I am struggling to ...
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2answers
55 views

DC motor works from battery but not from lead with same voltage

I am trying to hack an old walkman with a pot that controls the DC motor speed. But first I'm trying to remove it from the AA battery and instead use a 1.5 V lead from a synthesizer to power it. It ...
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1answer
44 views

what is cut off current in dc motor?

This question is conceptual question. May it is easy for engineers to explain cut off current in DC Motor. In our formula, we are finding motor torque, $$T_{motor} = C_{motor} \times (I_{cut} - I_{...
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34 views

Proof of DC Motor Back-EMF Expression

The book I have states the back EMF for a DC motor is equal to, $$v_b = \omega_r L_{AF} i_f$$, where \$\omega_r\$ is the rotor speed, \$L_{AF}\$ is the mutual inductance between the field and ...
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0answers
27 views

Which power supply choose for lineal actuators?

I have two actuators each of them with the following characteristics: 16 inch, 12v, load 750 N, travel speed 10mm / s, duty cycle 25% BUT Current Draw is not specified, and I have no access to the ...
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0answers
12 views

Replacing a motor under load-torque with 2 motors to give similar performance

I have the following setup: A servo DC motor which is connected to a drum and the drum drives a conveyor belt. There is a pulley at the other end of the belt which is the same radius as the drum. ...
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1answer
123 views

Why does adding a capacitor greatly improve this circuit?

I've been prototyping this pretty simple circuit for a while now: simulate this circuit – Schematic created using CircuitLab Description: C3 is charged to set point. Compatator out put goes ...
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2answers
35 views

Can I use a 555 PWM signal to control

I want to use a 555 PWM signal to control a motor. I also want represented the speed of the motor with an LED graph using a LM3914 led driver. Can I use a digital signal to control the LM3914 ...
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0answers
52 views

Volt knob with consistent current

I need a device that can maintain the current of an variable electrical signal while manipulating current and overall power. Example 10a 0-24v 0-240w. And the theory behind a device which will work ...
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0answers
23 views

FG servo motor speed issues

I have been trying to get a 40-year-old turntable back to life, with relative success until now. Everything works fine but for an intermittent issue with the motor. The motor has two modes (for 33 1/...
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0answers
21 views

Derive DC motor formula with drum driving a conveyor belt

The setup is a DC motor directly connected via its shaft to a drum which drives a horizontal conveyor belt. There is a load of mass, M, on the conveyor belt. I am stuck on trying to figure out what '...
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1answer
64 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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4answers
251 views

Brushless motor design with additional separation layer at the air gap

As a thought experiment, I was thinking about how to actuate an passive impeller inside a tube from outside, contactless. Imagine a tube equipped with an impeller inside it. The impeller is mounted in ...
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1answer
61 views

How does a DC brushless drill-driver work? [closed]

My new cordless, brushless drill has good torque, but it won't turn below about 50 rpm. My older brush-type drill, same model, will drive screws even at near-zero speed. Does the brushless circuit ...
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3answers
3k views

Why is it harder to turn a motor/generator with shorted terminals?

The shaft of an unconnected motor is easy to rotate relative to a motor with shorted terminals. If a resistive load is connected to the terminals, the turning difficulty is somewhere in between. Why ...
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1answer
237 views

Inferring back emf from oscilloscope

I have this stepper motor with unknown back EMF / RPM. There are 200 steps/rev (i.e. 1.8deg step angle), and 8mH "phase inductance", but I'm not sure if that's enough to calculate back EMF. I hooked ...
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0answers
44 views

Solar power pump - Design critique and help

Okay so, I have a design that 'works' on the breadboard. But I feel like it could use some improvement. Here is my current design: simulate this circuit – Schematic created using CircuitLab ...
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1answer
53 views

Extracting back EMF from DC motor

As DC motors generate more back EMF, the current that the motor receives drop lower and lower. Now if there were a way to extract the back EMF of that motor out of the circuit (I don't know if that'...
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32 views

L6203 motor driver with high Rds(on)

The L6203 states that it typically has and Rds(on) of about 0.3 ohm. After implementing the circuit below, I'm measuring a significant voltage drop across the transistors when the motor is stalled (or ...
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1answer
26 views

DRV8833 does not work with output of hobby RC receiver [closed]

I'm trying to drive the DAGU robot chassis with Pololu engine drivers. Driver requires - at minimum - the following connections: VIN (for the motor) GND AIN1 AIN2 AOUT1 AOUT2 GND (for the logic) I ...
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1answer
34 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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0answers
19 views

Correct way to drive the L6203 Full Bridge driver

I need to control a brushed DC motor in both directions using the L6203. The block diagram is shown below. Motor voltage will range from 13 to 16.8V, with a maximum RMS current of around 3A. From the ...
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2answers
103 views

Incorrect operation of the Allegro A3941 driver

I use the Allegro A3941 driver in these modes: At very low duty cycle (<10%)PWM motor consumes 0.05 A and produces a squeak. If you increase the PWM duty cycle of the PWM to 10% the squeak ...
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0answers
21 views

PMDC Carbon Brushes

I am in the process of refurbishing a 700 W PMDC motor. It was fitted to a mobility scooter. When dissembled I found that two of the brush holders were heat damaged and the copper braided wire had ...
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1answer
36 views

DC electric motor model

In the paper "The study on electromagnetic compatibility of DC electric motor in HAPS" there is a description for a DC motor model structure : My problem is with imaging this model as I can't ...
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1answer
42 views

DC motor & microcontroller sharing power suply: dc motor shuts off after a few seconds of running

I have the following circuit: When I close the mosfet gate (i.e. set pin 1 to high), the dc motor will run for a few seconds and unexpectedly then stop. Inspecting with a multimeter, I found that ...
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1answer
66 views

Will this circuit be able to power a 12V DC motor

The circuit below is designed to power a 12V DC motor, which has to operate in both directions with variable speeds, using the Arduino as control unit. The center components (resistor, coil and ...
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3answers
100 views

How to make a motor capable of resisting physical movement?

Is it possible to make a motor capable of resisting physical movement? For example, at the gym you control the resistance to movement by putting more load, more weight. Is there a way to control that ...
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2answers
71 views

How to generate electricity from clockwise or counterclockwise rotation? [closed]

Can something that rotates freely in space generate electricty when it spins from both the clockwise and counterclockwise direction, or could you only draw electricity from a clockwise rotation? What'...
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2answers
97 views

How to measure DC motor (used as generator) efficiency using homebrew methods?

Background I'll be making a "micro thermal power station" in the single-digit watt range at home (one-off, educational project. Bear with me). A heat source, likely ethanol, will cause a stirling ...
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0answers
69 views

DC permanent magnetic motor control issues

We have a 180 V dc permanent magnet motor. When engaging the control board while the motor is hooked up. The output to motor drops out and reads no voltage. If I take the motor leads off the ...
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4answers
117 views

How to overcome over-current in a circuit?

I have a relay switch that operates at 10 A and 120 V connected to a DC motor that runs at 18 A and 36 V. Will the relay switch burn out? If so, how can I protect the relay switch?
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1answer
82 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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0answers
18 views

DC motor simulation in ansys simplorer

I am doing simulation of DC motor in ANSYS Simplorer in which I need to insert following parameters in motor model: Armature resistance=0.115ohm Armature inductance=0.8479mH Rotor Flux=0....
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1answer
38 views

Motor Speed Output Signal [closed]

I need an advice. I just got a DC motor and its controller board. On the controller board it has 6 pin/wire: +12V, GND, PWM, ENABLE, DIRECTION, SPEED OUT. What I want to know is how do I interpret ...