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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Is the consumption of a DC motor linear? [closed]

I mean, if we know that the motor consumes 100A to move a 10kg load, will it need 10A to move a 1kg load?
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How to supply power to a DC motor which will be used for an electric skateboard?

I bought a 775 DC motor 15000RPM 12-36V. I'm planing to build an electric skateboard with it. But I don't know how to supply enough power to this motor in order for it to carry me with a decent speed. ...
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How does a system measure the speed of a servo motor using brushes on the commutator?

I have a servo motor with 4 brushes on its commutator. The motor is connected to a controller that enables the user to control the speed and at the same time it has an analog RPM meter which most ...
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What's the difference between Maximum working current and upper limit of instantaneous current? [closed]

I am seeking to protect a Mabuchi RS-380-SH4535 motor + battery system using a BMS. The battery is a single cell 18650 LiIon. The motor has a stall current of 15 A at maximum battery voltage. My ...
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Need advice on using a DC motor to generate mechanical drag for an exercise "sled"

I'm trying to DIY-emulate an existing, but pretty expensive, piece of exercise equipment. Though called a "sled," it's really just a cart that provides resistance as you push it down the ...
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Can I power a 20.5V DC motor with a 24V PWM power supply?

I am building a coffee roaster using an Arduino Uno and a custom coffee roasting control board known as TC4+. The board has a PWM controller built in. I have a 24V power supply and a motor, which is ...
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How to run this DC motor properly?

My beard trimmer has a very weak motor, so I want to upgrade it with this DC motor. I want to run it with 5V. What is an adequate power supply for this? Do I need a DC motor starter? What kind of ...
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Motor driver blanks out AM/FM radio reception

Story I do many restorations of 'boomboxes' (70s/80s/90s) especially the decks inside these units. Next to the common problems with belts, gears, pinch rollers, rubber rings etc there is another issue ...
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12V DC motor takes substantial amount of current when the direction is reversed

I am working on an underwater ROV. I am running four 12V DC motors using an Arduino Uno and four N-type logic level MOSFETs to control the speed of each motor individually. There are also four 12V ...
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Isolate digital switching from audio circuit

I'm using an L298 H-Bridge to drive a DC motor. The motor is spinning a magnet across a guitar pickup at ~30 Hz. That signal is then amplified and sent to a speaker. However, the output signal also ...
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Simple DC motor

this is a question about a simple dc motor. both of the options (2) and (3) appear to be correct. I would like to know if I have any misconceptions
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Why would a motor have 100kW in 90kW out?

I might have phrased my question wrong but our lecturer asked us a question about why a motor (or generator I am not sure) would have 100kW in and 90kW out. He proceeded with saying that it had ...
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How do you use Arduino as ESC

I am trying to find a way to use an Arduino as an ESC for an electric scooter project. I have dual 12v 90w brushed DC motors (from razor e90). I'd also like to be able to get speed data (or voltage/...
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Under FOC control, can current sampling be removed when the inductance of the motor is small?

I have dismantled a micro coreless servo motor produced by SIEMENS and made a copy of it. Then I designed an FOC driver board using single shunt and transplant the FOC algorithm to make a position ...
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1 answer
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Finding the Kp and Ki expressions for PI controlled DC machine and what exactly does the bandwidth (wc) mean?

I found this method of tuning the PI control for a DC machine. It mentions that we can use the PI zero for pole cancellation of the plant. I cannot derive the expression shown for Kp and Ki in the ...
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5 answers
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What explains this bulb/motor behavior?

My son was building circuits with a hobby kit. He tried connecting a small DC motor and incandescent bulb in series with two batteries. The motor is not marked, probably is rated at no more than 6V. ...
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Do I need a voltage regulator to maintain a constant 12V voltage to run a 12V brushed DC motor?

I am building an autonomous mobile robot. I am using Pololu 12V, 75:1 Metal Gear Motor (No Load Current: 300 mA, Stall Current: 5.6A), Cytron 20A Bi-Directional 6V-30V DC Motor Driver MD20A, and a ...
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6 votes
4 answers
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Tiny inductors and capacitors connected in parallel to a DC motor terminals

Why would you connect tiny resistors and capacitors in parallel to a DC motor as shown in the picture? Why would two of the resistors be connected to the outer shell of the motor? I checked the ...
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How to check for the specification of the motor to lift a certain weight? [duplicate]

I'm trying to figure out how much power, torque and rpm required for a motor to carry 2-3 kg (including his own weight). Also, the speed at which the weight is lifted doesn't really matter as much as ...
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1 answer
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Step down from 24V to 12V to drive 12V pump causing 30V back to supply [closed]

This is strange situation, where main power is 24VDC from adapto. Then, I need to drive 12VDC pump and I decide to use step down module adjust to 12V and connect direcly to that pump. The 30V DC just ...
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2 answers
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Can I run a 775 DC motor with DC solid state relay? [closed]

I want to run a 775 DC motor with 12V DC power battery.DC motor link:https://www.nbleisonmotor.com/RS-775-Dc-Micro-Motor-pd6675924.html I didn’t find any suitable controller for this. The controller ...
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Can I use one power supply for different ampere motors? Will it affect the motors?

I have two motors, one motor uses 12 V 5 amps and another motor needs 12 V 7 amps, I have a power supply (SMPS) of 12 V 30 amp capacity. I'm planning to connect both motors to the same power supply. ...
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A simple electro-mechanical model of a DC brushed gearmotor

I'm trying to arrive at an estimate of motor angular velocity during startup phase, specifically the time it takes for the output shaft to rotate n degrees from power on. I'm looking at DC brushed ...
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2 votes
2 answers
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Protecting small DC motor (power door lock actuator) from burning out due to stall

This question of small DC motor burnout due to heat/stall has been asked in a few different ways/scenarios already, so I think I have a basic understanding of what the issue is -- I'm interested in ...
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What's the minimum duty cycle which can be applied to a brushed DC motor?

I am trying to control the speed of a brushed DC motor by varying its duty cycle. By testing it out, I have found out that for my application it should not go above 60% of its duty cycle, this being ...
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Categorising the different types of DC motors; Opinion needed

I'm trying to build an understanding of the different DC motors and their properties. When searching for "Types of DC motors" you'll often find this image: This diagram is great, but I fail ...
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Controlling two DC motors with single driver IC

I've designed a PCB that drives two DC motors with two MC33886 DC motor Driver ICs, controlled by an MCU for PWM and direction. The max. motor current is about 3.5 A. It works perfectly but now I'm ...
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1 answer
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H-bridge gate driver for an ESP32

I used an H-bridge for 12V 10A brushless DC motor. The motor must run in both directions. ESP32 ----- Multiplexer Circuit ---- Gate Driver ---- H Bridge ---- Motor I have a few questions. Am I using ...
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Scooter - BLDC motor calculations

I would like to ask you for few question related to BLDC motor. I am trying to build my own scooter, but I don't know how to choose BLDC motor correctly. Actually I understand the electrical aspects ...
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Why is my LiPo battery limiting its voltage when I turn on my DC motor circuit?

I have a circuit that is supposed to run four 12 V DC motors with built-in motor drivers off of one LiPo battery. The LiPo battery (single cell 3.7 V) is boosted to 12 V (the converter circuit is ...
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2 votes
2 answers
190 views

Half bridge motor driver; best motor placement?

The two options: I have been scrolling through forum after forum for a unilateral agreement on what the best motor placement would be within the half-bridge driver circuit: Putting the motor across ...
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Can inductors interfere with a BLDC motor?

I'm working on a student project. It involves running a brushless DC motor with 70uH external unshielded inductors on each phase. Can the inductors, seeing as they generate a magnetic field, somehow ...
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1 answer
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Why isn't wave winding a DC generator like shorting two voltage sources of different potentials?

Say each conductor moving in a magnetic field produces EMF \$e\$. In the below setup, the first parallel branch has 5 coils (5,9,4,8,3) and second branch has 4 coils (1,6,2,7.) This means, at a ...
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Lead width range for motor driver IC

I am creating a footprint for this part in Altium. I was able to get all the dimensions, but can't seem to figure out the lead width range as shown in this diagram: I was wondering if anyone could ...
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1 answer
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Computation of DC motor parameters [closed]

How does one compute DC motor parameters instead of measure? Example: inductance, backemf,torque? Would one use a EM simulator or is there another way?
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Does this motor ever run?

I've been studying lap winding in dc motor and the geometry is quite interesting. I stumbled on below arrangement of coils for a 4 pole 4 slot double layer simplex lap winding. My thoughts: This ...
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Protections for bidirectional motor controller circuit for DC brushed motor

I am designing an H-bridge based DC motor controller. It should be able to control 4 quadrant operation of a DC motor, therefore I am using four STB85NF55T4 MOSFETs and four IN58198RL Schottky diodes ...
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Alternator without a battery

Can I run a 24 volt DC motor with current from a 24 volt alternator, with bridge rectifier, without having a battery in the system anywhere?
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1 answer
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DC motor, disadvantage of having independent coils

My knowledge in electrical motors is not that good. In first pic, when the coil is vertical, torque is \$0\$, but inertia keeps it spinning counterclockwise. I get this. With only one coil, the ...
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5 votes
3 answers
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What kind of BLDC motor is this?

I pulled this motor from an actuator. I know it is BLDC based on the circuit-board, but I am not sure if it is a three pole or something else.
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1 answer
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Troubleshooting electrical scooter lack of power and battery runs low too fast

This is my first post here so I hope I'm doing it right :-) The problem My mother has a 3 year old electrical scooter (from April 2019). After a couple of years the battery started to run low rather ...
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0 answers
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Gate pulse PWM for IRF3205

I am trying to control DC motor with IRF3205, i cannot understand how much frequency pwm signal should be feed into gate of IRF3205.I want to operate 775sh 12V dc motor and the gate pwm frequency is ...
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-4 votes
1 answer
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Raspberry Pi 3 motor code gives gpio error

I am trying to code a motor using the GPIO pins on a raspberry pi 3 and for some reason, when I run the code, it gives me this error: GPIO.setup(enable_pin, GPIO.OUT) NameError: name 'enable_pin' is ...
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3 votes
0 answers
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Always stop the motor at the same position [closed]

I asked this question 13 days ago electronics.stackexchange. DC motor has to stop always same spot. If we take the area where the motor starts to rotate as 0, the motor should always stop at 0 degrees,...
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DC Motor as Generator Experiment

I'm doing a "Snap Circuits" project which is supposed to demostrate that a mini DC motor can act as a generator and light an LED. Following the instructions provided, I made the following ...
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Motor 12V 16RPM - how to calculate RPM based on PWM?

I bought a motor specified for 16 RPM at 12V. This motor is controlled using an L293D integrated circuit to control speed and direction. This is the manufacturer's specification table for the ...
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Why does a rechargeable battery spark on one terminal?

Why does it spark at one of the terminals of a rechargeable battery when the 3 V motor is connected as shown below? It's burning hot to the touch, with the motor connected to the battery only for a ...
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3 answers
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Small brushless motors: What are the inherent trade-offs between 56V and 18V motors? [closed]

While researching tools in the quest to become a handyman, I was captivated by the fact that one of the top brands sells 54V (60V max) cordless power tools while another sticks to 18V. Two questions ...
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1 vote
2 answers
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Blocking reverse transients in bidirectional circuit

I have a bit of a puzzle to try and work out for a friend, and it's beyond even my abilities to fathom - but then, it's an analogue problem and I don't "do" analogue... Basically we have a ...
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1 vote
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Powering up l298n module

I have a l298n motor driver, hbridge, which i am using with my raspberry pi. I am supplying 6V to the hbridge from a battery holder that takes 4 AA cells so in total it is supplying 6V, yes. Now the ...
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