Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

0
votes
1answer
32 views

PWM as a voltage regulator for 12V wiper motors and 14.8V LiPo

I'm using 12V (~40W) car wipers motors for small robotic project. Motors are driven over MOSFET H-bridge (IRF1405/IRF4905) with PWM speed/power regulation. Currently a voltage source for motors is a ...
0
votes
0answers
36 views

Change Direction of 12v DC Motor Rotation using Relay with stop function

I want to make a circuit to change 12 Volt DC Motor direction, similar to this question: "Change Direction of 12v DC Motor Rotation using Relay", but with the addition that it should stop at each ...
1
vote
1answer
60 views

Mosfet Motor Drive amplifying duty cycle of PWM

I am receiving PWM signal at 7.8V from a given controller, with which we need to control the speed of a DC motor at 18 V. I implemented the following circuit for this. However, the output to motor ...
0
votes
1answer
43 views

How capacitor values are determined in this circuit

I am following the course on control systems from edx. I have this circuit as part of practical exercise. I would like to understand how the capacitor values were determined in this circuit The 47uF ...
-1
votes
0answers
13 views

1 motor 2 power suplies to control direction

Well it has been a long time since I have played with motors and electronics, and I hoping to get some direction for people much smarter than I. I have a 12Vdc actuator I use to control a door. I ...
0
votes
0answers
28 views

DC motor speed calibration

I have seen some treadmills with DC motors that have an option in the console to calibrate the speed sensor by making the motor run from 0 to max speed. Also, some of them have an external ...
0
votes
0answers
26 views

How does compensation windings help to maintain the motor torque?

I know he armature flux superimposes with the main field flux and, it disturbs the main field flux, to reduce this so called armature reaction, the DC motors are provided with compensation windings(on ...
0
votes
2answers
52 views

Brake DC MOTOR circuit

I have a DC motor that is controlled with an npn transistor with pwm. Everything works fine. I want to brake the motor instantly. I tried to short the terminals with another pairs of transistors but ...
0
votes
1answer
59 views

Designing a windmill [closed]

As a pet project I'd like to make a small windmill. I'm in the very beginning stages so I'm still researching components to use and have a lot of questions so I came here to start my journey. I was ...
0
votes
3answers
42 views

adding a switch for direction reversal in 12v DC motor w/ PWM controller system

I have a circuit for a 12v dc motor with a battery and a PWM controller. the system sort of is in this order battery-->PWM-->motor. I want to add in a switch to reverse the polarity to switch ...
0
votes
0answers
33 views

Parallel Path in DC Machine

I am not able to perceive the concept of Parallel Paths in DC Machines. What does it really mean and how can I visualize or imagine it. I know A=P in Lap Winding and A=2 in Wave Windings. But what is ...
2
votes
1answer
67 views

Sound sensor not working when connected to DC motor

I made a small circuit to control a DC motor with a sound sensor, using an ATtiny 85 and an L293D. It worked on breadboard, but now that I have a prototype PCB it ceases to work. Whenever I connect ...
1
vote
0answers
39 views

Modelling a Braking DC Motor Speed Controller

I'm trying to simulate a brushed DC motor. The model comes from the following circuit diagram KVL yields: $$v = Ri + L \frac{di}{dt} + K_b \omega_m$$ My rudimentary understanding of speed ...
9
votes
2answers
2k views

Is this a case of ground loop?

I'm trying to power a 24V DC motor using 2x 12V batteries, an Arduino and a Cytron MD10C Motor Driver. I followed the description on Cytron's website for how to connect the Arduino and the motor to ...
1
vote
2answers
51 views

Stored LiPo battery voltage going up

I have an 8s8p LiPo battery with a fully charged voltage of 25.9 V and 25 Ah. This battery was used to run a brushed DC motor (rated current 1 A) using a motor driver circuit (which I assume helps ...
0
votes
1answer
40 views

Need assistance for homemade dc motor

I have made a dc motor with two coils and 4 commutators with 2 brushes. It has been powered by a 12v 1.5amp adapter and the coils have been wrapped 40 times on each end. However when I turn the power ...
-1
votes
4answers
100 views

Controlling DC 90V motor with Raspberry Pi or Arduino

I have project where 90v dc rotating motors(4 of them) must be controlled via Laptop. What is the most simple solution, Can I go with raspberry pi or need to go lower with arduino or there are ...
0
votes
2answers
58 views

Am I on the right track with the 16F1704?

I am 100% new to PICs and I know I have a lot to learn. My end goal is to have a DC motor controller that will operate a motor in one direction only and with the push of one button have the motor run ...
0
votes
1answer
35 views

Single battery for different voltage components

So I have a 12V DC motor and a 6V stepper motor. Ideally, I would like both of them to draw from the same 12V battery pack (due to build constraints). The DC motor will be fine but the extra 6V ...
0
votes
1answer
33 views

How would I limit speed of dc motor being used as a generator?

How would I limit speed of a DC motor being used as a generator? For a project where I have to make a wind turbine that will automatically limit speed of rotation once past a certain value. Thanks :)
1
vote
1answer
65 views

Why is my DC motor making a rattling scraping sound?

The DC motor on my hob extractor fan is making a rattling and scraping sound when I switch it on. I know it is coming from just the motor because I have tried running the motor on its own. What could ...
2
votes
2answers
133 views

PID Run Away Motor Control

I have a PID controlling a DC motor. I am attempting to control the speed of the motor very precisely. My controller allows me to change the direction of the motor and give it a pwm for speed. ...
0
votes
2answers
38 views

How to get stall current from DC motor model

I'm studying the model of a dc motor from this link : http://ctms.engin.umich.edu/CTMS/index.php?example=MotorSpeed&section=SystemModeling The equations are: \$\ s(Js+b)\theta(s)=K I(s)\$ \$\ (...
3
votes
2answers
78 views

Question on Speed Control vs Torque Control

I'm controlling a Permanent Magnet DC motor with PWM for a treadmill. I'm using a reflective sensor with 6 pulses per rev to get a speed feedback. So I'm actually doing "speed control" directly, but ...
1
vote
2answers
57 views

Is a Switched Reluctance Motor (SRM) a AC motor or a DC motor?

Is the current in a coil of an SRM alternating or not? I understand that we are giving a DC supply (say battery) but isn't the current reversing its direction. If yes, then it would be called AC but ...
0
votes
1answer
48 views

How to drive 4-pin fan

I've been attempting to get this 4-pin brushless dc pc fan working for some time now. It has a red (+) black (-) blue (PWM in) and yellow (tachometer out). I only want this fan running at maximum ...
0
votes
1answer
52 views

Separate two batteries getting charged by one charger with diodes?

I've got a robot that I use two batteries on. One of the batteries power the servos and engines and the other is for the digital boards. The servos need 5 V. The control board and LCD run on 5&...
0
votes
1answer
44 views

Question on PID for speed control of DC motor in treadmill application

In treadmill applications with DC motor, you can't go from 0.5 mph to 1 mph instantly. The speed should be gradually increasing. If I want to design a PID for speed control, my setpoint should be a ...
3
votes
1answer
93 views

What could cause the mosfet to burn out in my motor driver?

Here's the schematic: I've tried to make this motor driver as tough as possible, but I'm still seeing occasional failures where the MOSFET and the diode D1 are both failed short. Any ideas what ...
0
votes
0answers
29 views

EMF equation of Dc generator

In EMF equation of DC generator It is given back: emf = dphi / dt(for N=1) For p poles emf = p * phi (For one revolution) My question is where did the ...
-1
votes
1answer
64 views

Testing Capacitor in PWM Circuit with Oscilloscope Calibration Signal

I'd like to measure the effect of a capacitor in a PWM circuit with an oscilloscope. The capacitor is engaged on a switch connected to a DC motor. Can I hook the motor up to the 1 kHz calibration ...
1
vote
1answer
68 views

DC motor that drives a flywheel and a DC generator simultaneously

I have a project that I am analyzing a DC motor that drives simultaneously a flywheel (rotational inertia) and a DC generator. My doubt is, when I am creating the mathematical model of it, I would ...
0
votes
2answers
67 views

Relay Voltage and Current

I am using a 5V relay for switching ON/OFF a starter motor. The motor draws 12V/16A to run. The relay has the specification as shown below. My question is will this relay work or it will burn due to ...
0
votes
2answers
39 views

Question on brushed DC motor voltage measurement

I'm operating a brushed DC motor via PWM at 5 kHz. It's a big motor rated at 125V/27A. I don't have an voltage acquisition circuit. Just a multimeter. But I want my microcontroller to know what the ...
0
votes
1answer
25 views

2A Brushed motor driver

I need to power 2 brushed dc motors with 2A each and 3 to 6V, one direction(no bidirectional or break). To the enable the rpi 3.3V pwm, and standard pins(breadboard), not those micro pins. I know the ...
0
votes
0answers
47 views

Performance of RC car under different gear ratio, measured data vs hypothesis

Assuming the driveshaft of the rear wheeled drive RC car follows the linear DC motor theory for stall torque and no-load RPM, also voltage supplied is constant and no inductance as well. Note: the ...
0
votes
0answers
34 views

Motor or a Servo

I'm looking to build a motorized throttle quadrant replica of a Boeing 737 that would connect to Flight Sim. I do have a quite good idea of what I am trying to do and how to do it but I am fairly new ...
1
vote
1answer
61 views

BLDC (Brushless DC Motor) vs PMSM (Permanent Magnet Synchornous Motor)

The differences between BLDC and PMSM are very small and for what I have seen while reading about it, is not clear to many of us. Most of the articles I have read say that the main difference is that ...
0
votes
1answer
88 views

What the function of bjt and diode in this circuit

I want to know why we need to use bjt and diode in this circuit to activate the dc motor, thanks
0
votes
1answer
37 views

Dc motor as torque transducer for BLDC motor

I bought a cheap BLDC motor on some Chinese website and could not find its characteristics. However, I have A28-400 24V amp flow Dc motor with its characteristics. If I'm able to build a test rig to ...
2
votes
2answers
131 views

Detect if 470pf capacitor is in series with motor, using only two wires

Short Version: How can one detect if a vending machine motor is in its home position? Long Version: I am trying to make a circuit that would fit most of the motors used in the coil vending machines ...
1
vote
2answers
89 views

Why is my DC motor losing torque when over voltaged

I have these small dc TAMIYA motors rated at 3v at around 2-3 amps. I also have a driver that I'm planning to use to drive the motor. https://www.pololu.com/product/2992 I could not find any other ...
0
votes
1answer
44 views

Question on the right PWM frequency for Permanent Magnet DC Motors

I know that there are some posts in this site about this question. I don't know if there's a way to find out the "ideal" PWM frequency for motor control. Usually they recommend to be safe in a range ...
1
vote
1answer
52 views

DC Motor only works with programmer

I have designed a micro controller circuit to actuate a DC motor using signals from an ATmega234P chip via a L239DNE H-Bridge. The problem I am having is that the motor runs slower than usual while ...
0
votes
2answers
48 views

DC motor parameter identification using microcontroller

I've built a DC motor controller which measures the speed and current (not really sure yet about current values) of a permanent magnet DC motor. I plan to connect different PM DC motors. Is there a ...
1
vote
1answer
45 views

Controlling DC motors and servos with a single pca9685

I have a Raspberry Pi project (robot with wheels and servos) and I'd like to control both motors and servos at the same time. I'm trying to use PCA9685 + L298N for driving the motors. The problem I'm ...
1
vote
2answers
53 views

DC Motor PWM Circuit Implementation

I'm a little new to this, so bear with me: I am working on a hobby-related project that involves the operation of two DC motors in parallel, powered by a NiMH battery. (Crappy circuit diagram ...
1
vote
1answer
56 views

Control of a D.C. motor reversing contactor

I've got a forklift with a partially functional motor controller. As I've got a bit of experience with electronic engineering (as opposed to electrical), I have a few questions that I was hoping to ...
0
votes
1answer
34 views

Powering a RPi and a motor driver with the same LiPo battery

I have a 2-cell LiPo battery, a RPi3, and a motor driver with 2 DC motors. I wanted to use the same LiPo for both, instead of a LiPo for the driver, and a Power Bank for the RPi3. My idea was to use ...
4
votes
2answers
156 views

BLDC Motor Constants: Why is my Kt and Ke different?

I'm new to working with motors. Reading up on BLDC theory, it is repeatedly said that in SI units, the Ke and Kt will be numerically equal. I downloaded the motor spec excel sheet of the T1101 motor ...