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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45 views

Electric razor power oscillation [closed]

My electric razor when I turn it on, the motor runs very slowly and a few seconds they motor runs faster and after a minute back to slow again. When I turn it off for a few seconds, then turn it back ...
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Driving series wound motor with MOSFETs

I'm trying to control a series wound DC motor with PWM. The motor is rated for 23V and 0.35kW. The motor has 4 connections which form 2 coils that have to be connected in series. To switch motor ...
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Generators with EV motors

I've read several questions/responses about AC generator(s) running EV motors, but they are all talking about gas or diesel-powered generators. My question is along similar lines. My idea is a PTO-...
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What will be the max voltage and current rating of this DC rechargeable fan?

**Ok forgive my use of some terms and clustered explanation I have this 5inch(13cm) DC rechargeable fan, made by lontor(some company in china but popular in Nigeria) that's rated (i.e written on the ...
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DC Chopper Drive for Brushed DC Motors

This is, sort of, in continuation to my earlier question: DC Chopper Drive for Brushed DC Separately Excited Motor So, from all the details I have gathered over time (2019-2021), I think the following ...
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How is the technique and method to determine the optimum operating voltage of a dc motor

How is the technique and method to do measurement test in order to determine the optimum operating voltage of any type of a dc motor ? as always shown to us in motor specs e.g. ...
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All ingredients for DC motor power electronics design

I'm trying to sum up all the ingredients for motor control power electronics: High Inrush current circuit – The short circuit and starting current rating of the DC motor is 7 times higher than the ...
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51 views

Smoked multiple H bridges, don't know why

I am currently developing a self-driving slot-car. For driving the DC motor, I am using a ROHM Semicon BD6231F-E2 H bridge (datasheet: https://datasheet.lcsc.com/lcsc/1810241113_ROHM-Semicon-BD6231F-...
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Fully integrated H-bridge motor driver IC VS external FETs

I'm designing a new motor driver for a DC motor which has starting peak current of 30A and 28Volts power supply. Previous engineer used an integrated motor driver IC solution (VNH3SP30-E) that has a ...
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Solar panel + charge controller + battery + motor

I have a small compressor that I'd like to run off a deep-cycle battery which will be connected to a couple of solar panels through a charge controller. There will be an additional microcontroller of ...
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Why do I keep blowing this current shunt amplifier?

I'm using an INA293B3-Q1 current shunt amplifier in the standard high-side configuration as shown below. The supply is a variable DC power supply (0-20V). Rsense = 1 mOhm. And, the load is a ...
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How increase the current consumption of a DC motor?

I want to test if the mosfet of the H-bridge that controls a 12v x 100A DC motor gets hot, for this I am thinking of putting weights so that the motor lifts it, but for it to consume 100A I really ...
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What happens to a controller when a brushed DC motor stalls?

I'm working on a project wherein I have a motor that spins a wheel. The wheel has two hard stops spaced some angle apart. The motor must rotate to one hard stop, change direction, and return to the ...
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What are the benefits of a solenoid over a relay in an electric cart?

I was looking over the wiring diagram of a Electric Golf Cart and noticed the use of a solenoid. The initial literature I found suggest that the solenoid is only engaged when the key is in the engaged ...
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51 views

Why did I burn my L293D H-bridge

We are controlling an old RC car using a Pi Model B+ V1.2. We have two RS-380SH motors wired in series controlled by an IRF520 mosfet. As the Pi's PWM signals are only 3.3V, we are using the L293D H-...
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Is there formula for calculating how much continuous current and max current a motor driver can supply given a certain temperature?

Note I am a beginner :) https://www.monolithicpower.com/pub/media/cms_document/category_documents/AN124_r1.0.pdf This 'paper' shows how the heat of a motor driver reduces the current that can be ...
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Is it best practice to use motor drivers that supply continuous current greater than the stall current of the motor?

Note I am a beginner :) I have this 300RPM motor: https://uk.banggood.com/CHIHAI-MOTOR-GM25-370-DC-Gear-Motor-6V-100210300RPM-Encoder-Motor-p-1016183.html?cur_warehouse=CN&ID=519629&rmmds=...
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Why is the max current of the Pololu TB67H420FTG motor driver different to the max current in the datasheet of the IC?

Note I am a beginner :) This website states that TB67H420FTG motor driver can deliver continuous 1.7 amps for each "channel" i.e. motor. https://www.pololu.com/product/2999 However, Looking ...
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Where are the capacitors on the l298n module?

Note I am a beginner :) Looking at the l298n datasheet: https://www.sparkfun.com/datasheets/Robotics/L298_H_Bridge.pdf I noticed on the block diagram and "Pin Functions" table, there are ...
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31 views

can an AC 110V motor controller be used with a bridge rectifier work as a DC motor controller

I was going to buy a DC brushed motor controller but would an AC power supply, with heat sink and fan, connected to a bridge rectifier work? The dc motor is 48VDC 300W 5 amps.
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Help me understand this circuit - unexpected LED behaviour

I'm well out of my depth here – please be kind! My kids and I have set up the circuit below and the LED is lighting up unexpectedly. When the switch is off, so is the motor BUT the LED is on. But when ...
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How to detect collision in a toy car [closed]

I am creating a small car which can change its direction upon collision with a wall or an obstacle. For example, if the car is going north, upon collision it will start going south. I have no idea how ...
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2answers
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Underwater train project's battery powered DC/BLDC/Stepping motor gear/non gear requirements and water proof sealing problem

I am a software developer by trade, having put together a few beginner Arduino projects and such. My next project entails an underwater roller-coaster (without loops, just going over the surface, so ...
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1answer
72 views

DC motor with battery [closed]

I am new with electrical and want to install motor on my bike. I want to know how volt and watt are related in DC motor and how can they help me choose the right battery pack. If I have 1kW motor but ...
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1answer
53 views

Difference between h-bridge, dual half bridge and quad half bridge

Note: I am beginner. I'm looking at motor drivers on this website Various motor drivers have different specification for output configuration, i.e. :h-bridge, half bridge, quad half bridge and PWM. I ...
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132 views

Why is the blower fan not rotating in reverse upon reversing voltage? [closed]

I was try to hack a small blower to suck air instead of blowing air From what I recall, reversing the supply is the way to go. But it seems that the blowers simply does not move. Here is a link to ...
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DC Motor Speed and Current

I have a question regarding DC motor. I was just curious to read on what factors does the motor RPM depend upon. I read that the rated voltage is the parameter that defines the speed of the motor. But ...
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LLSD101A diode replacement

I am ordering parts to build an OSMC Motor Controller for a 24V system. The schematics calls for LLSD101A , surface mount Schottky barrier diode. I would like to use through hole components, but I ...
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Arduino with Motor Shield VNH5019 and mpu6050 (gyrosccope) problems

I'm working on a project that involves a brushed dc motor RS550. I'm using the vnh5019 motor shield to command my motor with a gearbox that reduces the rpm to 4/5 rpm. I've attached an mpu6050 to the ...
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Difference between bottom and top dynamo/motor in a dot matrix printer

What is the difference between bottom and top dynamo/motor in Canon or other dot matrix printer (I'm only aware of one whose job is moving carriage left-right back and forth) ? Which one should be ...
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How I can read optical encoder pulses on High RPM

I am working on a project in which I am using two DC motors with encoder but after certain speed ( my DC motor operating voltage is 24 V but when I give it more than 15V )my MCU CC1350 start missing ...
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Calculating the constants of a permanent-magnet DC motor

Based on measurements (current and angular velocity dependent on a given voltage from 0 to 12V) and force dependant on a given current (0 to 2A), I want to calculate the armature resistance, torque ...
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Stair lift lead-acid batteries - dead after 1 month

I encountered the following issue: the lead-acid batteries (2 * 12V 7Ah) that power up the stair lift motor (24V, 0.3 kW) died ...
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Why do typical DC motors use brush contacts rather than just conductors?

Why do typical DC motors use brush contacts rather than just the conductors of the wire itself? Wouldn't the wires be more efficient/low wattage dissipation in that region?
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Finding RMS current of BLDC motor

I have a BLDC motor rated at 72V 1500W. I am working on an application that requires me to perform certain computations using the RMS current but I understand that I can only get the rated current ...
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Do I need a diode? How would I put one across my motor?

I've been building a circut to run a motor forwards and backwards for a project I'm working on. I'm not sure if I need diodes to protect the transistors, because I have no idea how to add them as the ...
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High current regulator

I have a DC motor (I=10A,V=12V.) I want to drive this motor with an H-bridge and want to have speed control with votage (2-12V.) I think I need a regulator with high current. How can I make a high ...
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High no-load current and speed in a brushed DC motor

TL;DR Small (20 mm dia.), (very) cheap, permanent magnet brushed DC motor draws a lot of current and runs faster than expected above certain RPM at no load. Up to that point it follows the textbook ...
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How does supplying a DC motor with lower than rated voltage affect current draw?

I have a DC motor with the following characteristics: Voltage: 24V Rated Current: 14A, Speed: 2750RPM Power: 250W I am using a 12V 7Ah battery as a supply for this circuit. The motor is controlled ...
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775 Motor with 9V 1 Ampere adapter

I am trying to run a small fan I had created using 775 motor. There is no rating, mark anything on that motor. I tried running with a old unused 9V bike battery and it runs too fast. So I end up using ...
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1answer
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How to interchange between two cores (inside a coil) in a simple brushed motor

I am going to build a very simple brushed DC motor. The rotor will not be enclosed in a stator (the rotor will be built on a bench with free space around it), and I will using permanent magnets to ...
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Protection for arduino on two direction dc motor?

Basically I don't want to use an h bridge, I just want to protect my arduino when changing the direction of the motor. The code i use: ...
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1answer
117 views

How to tune this PID loop

I have a DC motor that is controlled by an FPGA and a L298N motor driver board. The FPGA generates a PWM signal based on feedback from a dual channel quadrature rotary encoder (1000ppr per channel). I ...
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1answer
29 views

Is there a workaround for a Hall effect encoder out of alignment with its sensors on a small motor?

I'm working with two budget SmartArduino 9V 25mm motors on a radio control tank project. Motor-A has a problem in that the encoder wheel is situated laterally above the Hall sensors. Motor-A does not ...
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Part for DC Fan in EagleCAD

I have been designing a circuit that involves a 5V DC Fan. When I was creating the schematic on EagleCAD, I couldn't find something that resembles a Fan other than a Motor. Should I stick with using a ...
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2answers
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How to calculate size of capacitor for microcontroller that has changing loads on its 5V supply

How do I calculate the size of a filter capacitor to reduce the ripple when I have a microcontroller on the same regulated power supply as a high current load like a motor? My parameters: Motor: DC ...
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1answer
29 views

Maintaining a current in a circuit connected to multiple DC motors (3.0V) that turn on and off arbitrarily

I have a circuit that is connected to multiple DRV8833 motor drivers. Each motor driver is connected to two 3.0V DC motors. The timing of when they run and stop and how many rotations they perform is ...
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110 views

PID Control with DC motor and encoder (FPGA)

This is a follow up from a previous question I posted. I have made some changes from advice but still have problems. I have developed a processing core on an FPGA that can execute some instructions to ...
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3answers
165 views

Need advice with PID loop on hardware

This is my first time using a PID control loop so I have a lot to learn. I will explain what I am trying to do before I ask any questions. I have an FPGA running a processing core that I made myself, ...
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1answer
44 views

Protect small DC motor from too much solar power

I'm setting up a hobby project where I have a DC motor running from a small solar panel. I've tested connecting the panel directly too the motor and it works great. The problem is that in bright light ...

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