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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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Motor Speed Output Signal

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 ...
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BLDC startup algorithm

How do real world algorithms for sensorless BLDC motors handle startup under load? Right now I run phase 1 for a few milliseconds to get the rotor in a known position, the I run open loop for a ...
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27 views

what is field exitation type of 775 DC motor?

There are different types of field exitation modes. Some of them are Shunt wound series wound and permanent type So, what type of motor is 775 DC motor? i have tried to search the type from ...
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49 views

Identify DC Motor from Dremel

I am trying to run a formerly cordless Dremel with a 12V supply. I know that the dremel runs off of a 4.8V battery, so I would like to see if I can run the motor with 12V PWM without damaging it. ...
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Does operating a DC motor at low PWM freq (500 Hz and below) deteriorate the motor performance?

What impact does a PWM signal of 500Hz and 20KHz have on a DC motor, especially in terms of performance, life-span of the motor, etc? So far I have seen posts that only talk about the buzzing sound ...
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BLDC Motor max load

Hi i have a BLDC moter https://www.banggood.com/350W-48V-DC-Brushless-Motor-Geared-Ebike-Tricycle-Kit-Engine-Electric-Scooter-p-1419702.html?akmClientCountry=NL&rmmds=cart_middle_products&...
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Why Does this Short? [closed]

simulate this circuit – Schematic created using CircuitLab I'm new to electronics and wired a dc motor to a battery and switch. After the battery got really hot, I realized that it was probably ...
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How can I use PWM to power a 1.5v dc motor with an 5v board Arduino UNO?

I tried to calculate the value for analogwrite which is 77 but that doesn't work. I also tried a bunch of other value but none of them spin the motor. Is this possible and am I missing something? the ...
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36 views

Impedance frequency response for a DC motor

Consider the following impedance frequency response for a DC motor : Its equivalent circuit is : Clearly, from the response, there exists a capacitor, inductor, and resistor, but my problem is how ...
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70 views

Why does stronger magnets improve a dc motor? [closed]

I know that it interferes with torque somehow? But is there anything else? Thanks so much for taking the time to answer.
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105 views

Simplest way to switch inductive load with arduino?

I'm trying to switch (just on/off) a 3.7V motor (coil resistance 2.2 Ohm) and a 6V motor (coil resistance 8 Ohm) with an arduino mini. And I have trouble finding an universal way to do so. What I ...
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35 views

Help understanding amperage of DC motor and heat generation

I am diagnosing an issue in an automotive HVAC system and have been testing the blower motor. I would expect somewhere approximately 8A to 15A of current draw. I have test wired the motor with 14AWG ...
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L298N motor driver not working after connecting SPST switch

So when I had all wired as depicted in the first image, it worked fine, no problems. The red LED on the L298N board was illuminated and the dc motor was following commands from my Raspberry Pi. Now I ...
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Insufficient torque from motor connected to H-bridge

I'm currently attempting to convert my son's broken 1:14 scale R/C Bugatti Veyron (similar to this) into an app-controlled car using an Onion Omega with a servo/PWM expansion. However, I am having ...
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77 views

High voltage and current

I have a DC motor that needs and works nearly 400v and 20A. I chose FDL100N50 for n-channel mosfet also IXTK40P50P for p-channel mosfet. I connect a 4n35 optocupler for output of every mosfet. Are ...
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28 views

Small 12V DC-Motor Non-Linear Torque vs. Current Curve

I am currently investigating a malfuction on 12V small electric motor. it is performed torque vs. current measurements on a group of samples and some of them are showing non-linear current i.e ...
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120 views

Potentiometer warm up issue

I have a microcentrifuge which has a DC motor rated 24V, 10 Watt and 7000 rpm. I have attached one 5W, 500 Ohm potentiometer with it to control the speed and it works fine without heating up. ...
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105 views

L293D DC motor affecting LCD display

In the circuit below, I have noticed that when the DC motor (12V) is disconnected, everything works nice. The LCD correctly displays what arduino sends to it. But ...
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Picking the correct TVS for full H-Bridge Motor Driver

I'm building a full h-bridge using a HIP4081A and IRF1405 MOSFETs that will drive brushed DC motors (design based on Open Source Motor Controller project). This will be powered by a 12V power supply (...
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48 views

How does one determine the type (AC v. DC) and operating voltage of small motors?

I've become fascinated by Rolling Ball Sculpture (RBS) and plan to start building my first one soon. Typically a RBS uses a low-voltage, low-RPM motor to carry the marbles to the top of the structure ...
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35 views

Calculating motor load

I intend on building a small robot with a DC motor that operates with voltage of 3V-6V. The website provides the no-load rpm, no-load current, stall current and torque all when it is at 3V. My first ...
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21 views

(RasPi) Trying to control 2 different water pumps with different relays

PS: This is for a school project and I'm not very experienced with electronics. I'm trying to create a flush system. I need to control 2 different motors, it's a single iteration circuit with a timer,...
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1answer
70 views

Driving a motor backwards and forwards using mosfet and Arduino pin safety

So I want to drive a motor from a handheld drill/screwdriver. And I have managed to get it going using the first schematics, and using pwm to control the speed. The Zener diode is there to protect ...
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66 views

DC Shunt Motor Load Loss

I have three DC shunt wound motors in series. Each motor has a coupling to a transmission. I am trying to work out (mathematically, as opposed to intuitively), what happens if the coupling was to drop ...
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3answers
84 views

why speed is not directly proportional to torque in dc machine?

I have a conceptual doubt about torque-speed relation in a DC motors. It's probably a gap in my thinking but I'm posting this question anyway. As per me "in case of dc machine we see that the armature ...
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82 views

Converting 0-5V PWM to 0-10V PWM using Arduino and Mosfet not working

I am trying to convert 0-5V PWM coming from an Arduino to 0-10V PWM to run a motor which has PWM line that operate for 0-10V. But as soon as I connect the PWM line to mosfet it either shows only ...
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1answer
42 views

Connect servo and dc motor to raspberry pi

I'm currently working on a project where I have build a RC car with one DC motor (forward/backward) and one servo motor (steering). I'm a newbie with electronics so I figured out by myself I needed a ...
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124 views

I have designed and 3D printed a new motor that was based on a video i saw earlier, however motor keeps stuttering and wont turn, what went wrong?

Figure 1 Figure2 I started by doing 150 turns on each coil making sure they were winded in the same direction, then connected the starting point of each coil together and took each phase winding to ...
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2answers
82 views

Relationship Between Number of Coil Turns in DC Motor and the Efficiency of Energy Retrieval From Regenerative Braking

When learning about regenerative braking, I began to ponder as to what the relationship between the number of turns in the coil of a DC motor is to the efficiency of kinetic energy retrieval from the ...
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91 views

What is this chip attached to DC motor

Hi being a invoice I am not able to figure out what is the chip attached to motor I got it from a non working toy. Is it a simple dc motor? Are the chip contain just resistor named as mc1, mc2? Or ...
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39 views

GM12-15BY-100 Stepper motor damaged,what caused it?

I have a dc stepper motor, GM12-15BYC: 2-phase, unload typical current = 150mA, Pull-out rate:800Hz, Pull-out torque:120 I am using the driver DRV8834 to control it. The configuration of the ...
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65 views

DC motor characteristics

I have a PM DC motor. I am controlling the motor speed using PWM. I wanted to know what is the relation between the torque vs dutycycle and speed vs dutycycle for the motor( given the fact that the ...
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2k views

Need help with a circuit diagram where the motor does not seem to have any connection to ground. Error with diagram? Or am i missing something?

I'm following a really simple electronics instructable found in this link: https://www.instructables.com/id/Vibrating-Timekeeper/. I've been studying the circuit provided but can't figure out why ...
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2answers
59 views

What is the actual stall current of a Mabuchi RS550VC-8518 12v DC motor (out of a Dewalt 12v battery-drill)?

This question is part of a long-winded way of working out the maximum working-under-duress current-load on a 3S Li-Ion battery from a 10.8v/12vMax Dewalt Drill. The replacement motor for the drill is ...
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1answer
79 views

voltage traces across pwm driven dc-motor: is that ok?

I'm driving a dc-motor with a BJT turned on and off with a 555 generated PWM signal. Here's the circuit (V1, Rl and L1 simulate the motor): There actual circuit - same parts - is on a breadboard and ...
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64 views

DC Motor Controller using only one button?

I have been trying to create a DC motor controller that can do numerous actions with just the use of one button. Basically when I click it has to go on way, when I click again it has to stop, and ...
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Shorting the output of both the channels of L298N

Suppose I started with a project requiring the control of motors and ended with using L298N in my project, realizing that my motor only takes around 1.5A when on load. Now, with time I realized that ...
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92 views

Why is my 180v dc motor circuit not working?

I bought a "Johnson" treadmill motor that I know works well, it's 180v, 10amp, 2.5hp. I decided to go with the cheap setup, so I powered it through a 10000w 80amp max scr, going through a full bridge ...
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178 views

I want to command a 12V DC motor with the output of a clock alarm

I want to command a 12 V DC motor with the output of a clock alarm. The output of the clock alarm is a 1V (pp) square signal of 100 Hz. I just want my motor supplied when alarm is on and then stop ...
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1answer
117 views

Detect speed of DC motor electrically

I'm looking to build a small robot using inexpensive DC micro gear motors. I would like to be able to measure the speed (count rotations) of the motors for accurate positioning etc. I'm aware that ...
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2answers
83 views

Reversing Direction of a DC Motor with Delay

I am making a kinetic sculpture and the movement of it requires a reciprocating motion. I have made the designed such that a dc motor powers the movement of the sculpture, and a rotating beam that ...
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73 views

Explanation of an electric motor schematic

Below is the schematic of a Bosch electric motor: What are the three double-lined (one thick one thin) elements on the left side? What is the part on the right (black thick lines)? What is the white ...
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2answers
133 views

What happens when an electric motor stalls?

Most electric motors have a “stall torque” listed and my understanding is that if you limit the output it will “stall”. What actually happens inside the motor that causes it to stall and why does it ...
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45 views

Which Approach is Better to Drive Brushless DC Motor with PWM Duty Cycle

I'm doing a project that use brushless geared DC motor, the motor is connected to a moving platform. I will drive the motor with PWM, the motor then move the platform from -a degree to a degree ...
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106 views

Transfer function of DC Motor

I'm trying to verify whether the transfer function in this control diagram is the one stated in this document. I tried solving it and got this: Shifting the armature current \$I_a\$ feedback point ...
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1answer
42 views

DC motor model issue

I use the following DC drive model: with the following parameters of the motor: Matlab variables for these parameters: ...
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142 views

Torque and speed control of a DC motor

I'm new to electronics and this is my first post so please be patient with me. Introduction I am required to design a rehabilitative exoskeleton-like knee-brace to assist sit to stand, I have faced ...
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3answers
58 views

What would happen to the voltage or current flowing through the motor in an h-bridge

I was wondering if some one could help me understand what would happen to the motor if I suddenly change the rotation from clockwise to anticlockwise or vice verse in an H-bridge configuration, would ...
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3answers
58 views

Variable Current Draw from motor for torque control [closed]

I am building an electric go-kart. I would like to use regenerative braking. I would like to have a brake pedal that controls the amount of torque (slowing the motor and wheels down) that the back emf ...
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55 views

Design a DC motor with a transistor

I am trying to design a DC motor with transistor. Following image shows the exact way I am trying to do so. How would I go about doing so, I am not so familiar with transistors, but something that ...