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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Help with wiring 2x60AHV DC motor controller
The Project
I’m building a mobile cart utilizing two gearboxes to facilitate movement, each gearbox is driven by two 12V 775 motors. The cart will be used to transport my telescope and other equipment....
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Does the system of ODE's for brushed DC motors also apply to BLDC motors?
The equations of motion for brushed DC motors are generally given as:
\$L \dot{I} + RI + k\omega = V_{in}\$
\$J\dot\omega\ = kI - b\omega\$
Where \$k\$ is the torque and velocity constant (assuming ...
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Motor with self-latching relay and braking function
I have a DIN 72552 latching relay connected to a 12VDC 775 motor and want to add a braking function. The motor has a stall current of 10A. I found this schematic that implements a braking function for ...
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If a DC motor accepts a higher and a lower voltage (for 2-speed modes), which speed will have more current drawn?
The load is a DC massage chair motor and nothing else changes when stepping down to the lower voltage (meaning no gear or other mechanical changes that would impact load). Will there be more or less ...
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Motor brake circuit using MOSFETs
I want to connect a DC motor to an Arduino or ESP32 which has speed control as well as a brake.
When I send a LOW output to the top opto and a PWM signal to the lower opto, I want the motor to have ...
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State space model of DC Motor
I was wondering if it possible to obtain the state space model of a hobby DC motor(brushed). Can anyone guide me through the steps if possible?
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When controlling a motor with PWM, why is the measured current proportional to PWM Duty Cycle?
For background, I am using a DC motor controller from polulu with an integrated current sensor (shunt resistor and op-amp) driven by PWM at a fixed frequency to control a brushed DC motor with a speed ...
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Can I Use the Stepper Motor Port on a Motor Driver to Control a DC Motor?
I have a HG7881 H-Bridge 4CH DC - 2CH Stepper Motor Driver Board. For my project, I need to control 5 motors: four 12V DC motors and one 3-6V water pump. I only need to turn the water pump on and off ...
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The Linearity of a DC Motor
I am trying to control a DC motor. I observed discrepancies in the results when attempting to utilize the linear relationship between the motor voltage and angular speed, which prompted me to ask for ...
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Safe to hard stop DIM 72552 latching relay?
I have a 775 12V DC motor with a stall current of 10A connected to a DIM 72552 latching relay with momentary start and stop buttons, as well as a 5A circuit breaker to quickly cut the connection when ...
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Why does my DC motor make whining noises when I try to drive it with a motor driver?
I want to drive this motor with this driver in a microcontroller project, but all I get is a loud whiny noise so I did some investigations and pinpointed my issue down to the driver.
My current (...
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Managing 24vdc inductive loads going to shared connector
Here's my dilemma - I need to design controls for a robot with a tool changer that picks up 3 different end of arm tools, each tool has a different 24vdc motor on it with rated standstill currents of ...
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Matlab Induction Motor Torque Characteristics
I'm having trouble with getting the correct plot from a coupled induction motor/DC generator system for an electric drives class. How it is supposed to work is the DC generator serves to simulate a ...
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Implementing a Half-bridge (half h bridge) from scratch in tinkercad, facing simulation problem! (more details in post) (12V~24V)
I am learning about motor controllers and I would like to learn them in depth and in as much detail as possible. I am trying to build my own H-bridge from only MOSFETs and other small circuit ...
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Driving a permanent magnet DC motor with PWM via optocoupler and an N-MOSFET
In a student lab project, we tried to drive a DC motor from FAULHABER Schöneich 2230V024S (148) and a reductor 81:1 22B (298) 2-16V L=35uH,
see the 024S variant in the datasheet, consuming about 600mA ...
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Circuit Diagram for powering 32 motors
I am working on a project in which I have to power 32 different motors with different rated currents and powers. The smallest motor has a rated power of 36W and a current of 1A, whereas the largest ...
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Explain the circuit inside a rechargeable hair trimmer
I have a small, normal hair trimmer:
This is the circuit inside it:
Some information:
The batteries are two rechargeable Ni-Cd 1.2V batteries.
D1 has 0.7V forward voltage.
LED (marked with "...
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Small electric motor doesn't work with high DC voltage?
I have a small electric motor (from a trimmer). I see this behaviour:
when I apply 2.5 VDC (from 2 AA batteries) to the motor, it works smoothly.
when I apply 4.2 VDC (from an adapter) to the motor, ...
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How to figure out the gauge and number of turn to create an electromagnet?
I'm trying to make a simple DC motor (nothing serious), I bought varnished copper wire (0.5 mm/22 AWG but don't mind buying more or different gauge if necessary). I made a simple magnet with 4 or 5 ...
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What is the purpose of the capacitor in this schematic? (Its the schematic of a 12V Fan Motor driver)
I found this circuit of a 12V electric fan of a computer.
I think I have understood how the circuit works besides the capacitor.
I found it here, via google: http://www.seekic.com/circuit_diagram/...
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DC motor speed control using flyback?
I'm working on designing a motor drive for a telescope mount that is giving me some trouble. I'm trying to decide between using a dc motor with feedback and a stepper motor. Speeds need to be really ...
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is it conventional for the induced current in a DC machine to flow in the direction of increasing induced electromotive force (emf)?
I'm learning about DC machines and in one of the figures, I noticed that the induced current flows in the direction of increasing ind. emf.
When I think about the two concepts (induced current and ...
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SN754410NE overheating when powering 24V and 6V motors with PWM from ESP32
I am using the SN754410NE to power two brushless DC motors SN754410 Quadruple Half-H Driver datasheet (Rev. C) (ti.com). I am using a PWM signal from an ESP32 on the logic pins 1A-4A to accelerate and ...
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Measuring brushed DC motor inductance
I am trying to measure the inductance of a brushed DC motor for which I have a specification sheet from the manufacturer. The spec sheet states an inductance of 1.8 mH (and a resistance of 0.05 Ohms)....
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Clark Transform code
I come through the following link dealing with clark Transfrom
:https://github.com/rubinsteina13/C_SPACE_VECTOR_TRANSFS_LIB/blob/master/vector_transfs.c
But there is something I missed in the program ...
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BLDC motor not working
I am attempting to connect a BLDC motor to a motor controller (24 V, 16 A), but I am unable to get the motor to start. The connection follows the configuration outlined in the accompanying image. In ...
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I need help identifying the purpose and type of a block in simulink of a DC motor modelling
I need to understand the purpose and type of the block encircled in blue from this simulink simulation from which i only have images, not the actual file.
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Electric moped PWM power diode failure
I'm back with my shoddy moped PWM project :)
Here is a link to my previous question which is directly related to what this question will be about: Electric moped PWM MOSFETs failure
Quick recap:
I ...
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Is a flyback diode needed when using an RC snubber?
In order to minimize ringing when switching the mosfet, I had to implement an RC snubber circuit. Now, in that case, is the flyback diode still required?
Also, I measured with an oscilloscope the ...
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RC receiver/transmitter motor control circuit not turning motors
I am trying to make a simple RC Controller/Receiver Motor Control Circuit to eventually to control a tank drive full size mobile robot. It is a intermediary step before I connect my raspberry pi to my ...
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Is this schematic ready to be made into a circuit?
I made this schematic for a board that will be the brain of a lamp I want to build.
The lamp will be able to move in 2D (up-down, front-back) with two motors which are connected via J3.
The lamp has ...
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Correct A4950 usage
I want to control a DC motor (24 V) with an ESP32.
Instead of creating my own H-Bridge I decided to use an A4950:
[...] A4950 is capable of peak output currents to ±3.5 A
and operating voltages to 40 ...
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Can a simple DC motor detect physical resistance or manual movement?
I'm currently fixing the tray mechanism of a CD player. I have replaced the broken cogwheel and the drive belt, but one problem persists: sometimes when I press the "open" button, the tray ...
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Problem with an Arduino DC motor controllable circuit
I am a material science student currently working on a project to build a simple circuit for controlling the speed of a DC motor. My goal is to avoid using motor driver modules by utilizing a MOSFET, ...
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Is thick or thin wire better for motor winding? [closed]
When winding a motor, is it better to use thick copper wire or thin copper wire? Keep in mind the space is limited so using a thin wire will lead to more turns and thick wire would give less turns in ...
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I have a 9V DC motor. Does it always consume the same amount of power? [closed]
Let's say I have an Arduino + motor shield connected to a 9V motor. At rest it consumes X watts. Now when I activate and spin the motor it consumes Y watts. Is X=Y?
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Motor type require for robotic arm
I am making a tennis playing robot. There is a tennis racquet mounted on a robotic arm. I want suggestion on what kind of motor will better solve the purpose.
The arm consist of multiple motors but ...
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DC generator and armature reaction and interpole
The magnetic field produced by the interpoles opposes the armature reaction field and works to shift the MNA back toward its correct position. Therefore, the magnetic fields from both the interpoles ...
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How to combine a 12V DC Motor in a Light Fixture with Dimmer & 12V DC to 110V AC Inverter?
I have a question regarding a light fixture I'm building that also has a motor in it. It has geometric shapes that spin slowly around the light (almost like a mobile) and this is what I'm using the ...
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How do ultra light high power BLDC motors achieve such high power-to-weight ratios?
I was searching for high power/torque density of BLDC motors, but when I compare the commercially accessible ones to ultra high end motors, they always make the commercial ones bite the dust.
For ...
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Electric moped PWM MOSFETs failure
I am back with my PWM moped project. Here is a link to my previous question if you're interested:
Advice about power MOSFET layout and heat management
Here is a quick summary of my circuit along with ...
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Confusion understanding series/parallel relationship of mechanical components of a DC motor in Simulink Simscape
After watching this youtube video, I am trying to implement Simscape model of a DC motor in simulink - see snapshots below.
I understand from both photos that the electrical components' resistance and ...
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What Causes Hand- Wound and Machine-Wound Motors to Have Different kV? Expected Efficiency and Power Differences?
I am trying to understand the motor power and efficiency of two identical motors with the only difference being the winding technique (hand-wound and machine-wound).
Both are essentially the same hub ...
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confusion about the input values for an LN298N driver
I want to control a dc motor via a LN298N driver. I get the basic setup but I am confused about the values for the input.
Here is my setup:
(the red and black cable connect to a 6V battery)
I want to ...
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Do I need the parameters (armature current, field current etc) to do part 2?
I've completed the first part, but currently stuck on the second. Our lecturer didn't give us much to work with, so I felt completely lost trying to do this. I've been trying to complete this for a ...
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How to make a dc motor ramp up/down
I am a model railroad hobbyist and enjoy dabbling in electronics. I would like to build a small circuit that will let the DC motor that pulls a locomotive take several seconds to reach full rpm. Also ...
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DRV8835 motor kickback affecting quadrature encoder
I am trying to use a quadrature encoder with some DFRobot DC motors on my custom PCB. They work fine at low speeds, but at high speeds they don't work (count each others ticks, etc). I was very ...
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Grounding issue with PWM fan controller on Raspberry Pi Pico to drive 12 VDC fan
I'm trying to build a PWM fan controller for an industrial Noctua PWM Fan (NF-F12 IndustrialPPC 3000 PWM). You'll find the schematic below.
The fan is powered by a 12 VDC power supply (...
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Is the 7809 bad for a DC motor?
I have a small 12V, 3S1P pack of 18650 cells. I am trying to power a 9V motor, but when I turn it ON the motor becomes very unstable, it spins, keeps running slow, then slows down, sometimes it does ...
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Is my setup for a 5V motor project faulty?
I'm trying to get a motor (5V nailbrush, no name, no specifications whatsoever) to spin for a set time and pause for a set time using a PIC10F200 microcontroller in conjunction with a 2N2222 NPN ...
