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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DC motor turning on and off when driving RC car
Here is a video with sound of what is happening: https://imgur.com/xh8cAyr
I bought a cheap RC car off of Amazon and replaced the motor driver (kept the same motors) with my own TB6612FNG Dual Motor ...
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Should I connect a small DC motor directly to the mains without an isolation barrier? [closed]
I recently found out I'd need to pay upwards of $2k in order to supply my entire house with automated blinds. I feel like I can definitely do it myself for a fraction of the cost.
For this purpose I'm ...
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24v Electric car kiddie regen brake issue [duplicate]
Looking for some help please. We manufacture small off road Land Rover Defenders for holiday parks and the likes. Up until recently these cars have run off 3x 8v lead acid batteries with a ...
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Why is the shunt field of a DC starter-generator disconnected when used as a starter?
The Lycoming T53 turboshaft engine is started using a starter generator. The starter generator is a shunt generator. When the T53 is started, the starter generator is used as a DC motor to get the ...
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BLDC motor don't rotate through the C code flashed nor ST Pilot Motor unless I manually rotate it first
I'm using the nucleo-f302r8 + x-nucleo-ihm08m1 + a BLDC motor.
I'm trying to make the motor spin on the press of a push-button. I made a C code for it but unfortunately, my motor seems stuck when I ...
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DC motor operation at no load
I was solving a DC shunt motor question where no load is specified to:
Speed=1000 rpm
Rated armature current=3.33 A
Rated voltage=230 V
And
Ra=0.3
Rsh=160
Line current = 40 A (at full current)
were ...
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How should you pair conductors for I2C with PWM for a DC motor over CAT6 to minimize crosstalk?
We would like to send I2C and 12v PWM for a DC motor over the same CAT6a S/UTP cable. I know this is not ideal, and "differential I2C" would be better, but for now standard I2C is what we ...
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DC motor set to 0.25 RPM pulling -5 Amps at nearly 20% torque - Why the heck is it doing this?
Drive controlling the motor: PowerFlex DC Drive, 460 VAC, 3 PH, 27 Amps, 15 HP/11 kW, Regen, IP20, NEMA/UL Type Open, No HIM (Blank Plate), User Manual, No Communication Module, A Frame
Motor in ...
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Powering a 3 V motor with 2xAA batteries for several hours
I have a 3 V toy motor that I want to run with some kind of stability using 2x AA batteries. In terms of load, imagine a little fan. I'm not sure how much torque that would add.
The motor is a brushed ...
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Slow Start on 12V DC Motor
I am designing a small mechanical device that makes use of a 12VDC motor. I am trying to stick with components that can be easily sourced from Amazon or other hobby electronics stores so that others ...
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Alternatives to reversing polarity on a DC to DC step up converter?
I am looking to drive a 12V DC motor with an encoder attached (Motor Link). The battery I am using is 6V (Battery Link) which requires me to use a DC-to-DC step-up converter (Converter Link). To ...
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BTS7960 current limit [closed]
I want to ask about current limit at BTS7960. I'm not clearly understand when read the bts7960 datasheet. I have using 24 V 20A power supply connect to BTS7960 then connect to 24 V 14 A DC motor. When ...
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DC motor design without brushed or electronic commutation [closed]
When applying DC voltage to the coils, will this motor exhibit torque?
Rotor is comprised of 24 iron blocks which pass through two stationary copper coils. The flow of current within the coils is ...
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Powering 150W 24V DC motor
I have two very basic motors, basically this one: amazon
Motor specifications:
Power: 150W
Volts: 12-24V
Amps: 4.42 @ 12V, 4.76 @ 24V
Speed: 3300 RPM @ 12V, 5500 RPM @ 24V
The project is a robot ...
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What capacitor is required for a 6 V DC motor running on a 12 V power supply?
For my school project, I am building a car powered by a 6 V DC motor running on a 12 V power supply. In order to prevent wheelspin at the start of the track, it has been recommended to add a capacitor ...
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Soldering 2-Wire DC Motor directly to PCB
I'm making a PCB that's required to be pretty compact. In order to reduce overall size, I need to keep a 2-wire DC motor as close to a PCB as possible.
It has standard tabs on the back, typically for ...
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Choosing a power supply for motor controlled by JD2912-1Z-12VDC relay
I have a JD2912-1Z-12VDC relay that controls the flow of power to a 12VDC 50W motor and I'm trying to choose a suitable power supply.
Initially I thought the amperage the motor draws would be 50W / ...
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What are the reasons or concerns with using an LED power supply to power a motor? [closed]
What are the reasons or concerns with using an LED power supply to power a motor?
If the motor is controlled via PWM and can be soft started would this alleviate the concerns / make it work reliably?
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Solid-state replacement for a mechanical switch for a DC motor
I have a battery-powered circular saw. The design looks very simple, basically a 18-20V lithium battery pack connected through a mechanical switch to a "895" brushed DC motor. The switch ...
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How to calculate the power of a DC shunt generator?
How much power a DC shunt generator can generate if it was coupled with this induction motor:
Induction motor:
3-phase / 400v / 50Hz / 600w / 1250RPM
DC generator:
Excitation voltage: 0-220VDC
...
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What is the mathematical relationship between motor velocity constant, Kv and temperature?
From textbook, it is stated that Kv = rpm/V. But how does Kv change with temperature mathematically?
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How to calculate the values and ratings of wound Induction Motor Rotor Resistance Starter resistors?
How to calculate the values and ratings for the Rotor Resistance Starter resistors?
Motor specs:
3 Phase 400V
1/2Hp
4 Pole
1750rpm
Y connection
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Single MOSFET can't handle Lego Medium Motor
I took some Lego medium motors and replaced their damaged cords with wires for VCC and GND.
I am trying to drive the motors as part of a simple light-following robot, but can only do so by paralleling ...
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Using a capacitor to drive Nema 23
Can anyone tell me if I can use a capacitor to drive a Nema 23 stepper motor? Looking for a cheap and crude solution without using a driver or controller. If so, help with what capacitor and how to ...
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How to control the speed of a twin motor diaphragm pump electronically or electrically?
I have a twin motor diaphragm pump, 12V DC 6A (might even go as high as 10A under load conditions). Picture below.
I would like a suggestion of how to be able to control its speed with a turning knob.
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Is this design to control a BLDC with 1 PWM signal feasible?
I've started designing my own BLDC speed controller for a RC Car. I've been reading this document from Microchip where they use 6 seperate PWM signals from the MCU to drive the MOSFETs which, to me, ...
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Low power: how to power a small dc motor from a logic low
I have made a circuit to power a small motor with solar cells that I have salvaged from garden led lights. The goal of the circuit is to power the motor everytime the sun has moved a little bit.
My ...
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How to derive the driving voltage and specifications of a DC motor?
I have lots of small DC motors that I want to classify and measure its specs.
Unfortunately with the years I have lost all datasheets for them, so I need to measure them manually.
This post described ...
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How do I calculate the current used by a BLDC motor under a load?
I am working on a robotics project where we are currently designing a battery. This battery is specific for a motor driver and two BLDC motors. I would like to know how much current will be drawn from ...
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Power 12V DC Motor with 16.8V (4S Lipo) using PWM control mechanism
I have recently completed a DIY robot that uses 2x 18650 cells (max 8.4V) and a step up module to power four 12V DC motors (Pololu 20d). For my next prototype, I would like to get rid of the step up ...
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BLDC motor - how do I find out which phase should be positive and which negative?
In this picture the current is either positive, negative or float for the phases. I am confused and can’t figure out which needs to be fed what, for my motor to go the direction I want.
Source: https:/...
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Relationship between DC speed control module and dc motor
Good Morning! I have a minnkota trolling motor that pulls 50a @ 36vdc (per the spec sheet). This unit leads a hard life (routinely running through mud and weeds which would be increasing resistive ...
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DC motors stall in toy car project
I am a total newbie. I am trying to make a toy car with two geared DC motors and two LEDs, all connected in parallel. I am trying to power everything with a 9 V battery, but I am running into problems....
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DC motor control using optical encoder wheel
I want to be able to precisely control a CNC spindle using an optical encoder wheel or hall effect sensor (doesn't matter which at the moment). The problem I'm running into is breaking down the ...
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What's the correct DC-motor brush shape?
First, a little bit of application background. Recently I came across a shipment of DC-powered pumps (like these, it says diaphragm but in reality they are more like plunger ones, i.e. they require a &...
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Microstep driver with arduino to control DC motor
I am new to robotics and I am learning and understanding basic circuits. I am using two microstep drivers with a single Arduino to control the speed and direction of two stepper motors. Can I use ...
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Need suggestion on wire size (AWG) for running brushed DC motors
I am a beginner and working on building a 4-wheel unmanned ground vehicle. I bought four brushed DC motors from Pololu. According to the datasheet, the stall current is 4.9A. But the wires that come ...
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If I were to run a motor slower, would the battery drain less?
This might be a dumb question, but I'm using a 48 V, 18 Ah battery to run a 48 V, 1800 W brushless motor. I calculated a predicted 34.6 min runtime at full throttle, however, I need it to be able to ...
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How should I configure the TRQ pin on the DRV8847 Dual H-Bridge motor driver for Independent Bridge Interface mode?
I'm looking into motor drivers for a design update and I'm leaning towards using the DRV8847PWPR. If I go with it, I intend to configure it for an Independent Bridge Interface (shown in section 7.3.34 ...
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What is causing one particular L293D chip to overheat?
I'm working on a device that controls three stepper motor actuators, one servo motor and a DC motor/encoder. The stepper motors and DC motor are run at 6V and are controlled by an Arduino Nano's GPIO ...
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How can I implement a brake in my child's 12v car? [closed]
I recently got my child a 12v ride on car. The car's internal control does not have a brake, but there is a parent remote control which has an emergency brake button. This button seems to hold the ...
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Stall current on dc motor
I have a 250W dc brushed motor running off 24v.
I controlled it with hbridge controllers rated for 40A, which should be enough... I thought.
My reasoning being that 250W at 24v would limit it to 250W/...
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Controlling Flow/Pressure of a Diaphragm Pump
I searched for similar questions; especially this post, but I don't know if the answers apply to my question as well.
I am a software guy and have almost no clue about electrical engineering. I am as ...
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How do you properly explain the torque speed curve of a DC motor under the effects of field weakening? [closed]
As far as I understand, in order to use field weakening to achieve greater rotor speeds, one needs to drive the motor with maximal flux at the stator in order to reach the voltage-limit-line (...
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Calculation of inertia and friction coefficient of a DC motor
If inertia and friction coeffient of a DC motor are not provided in the datasheet, how can I get them? I need them to design a control loop.
Example:
https://www.robotshop.com/products/12v-dc-motor-...
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Why using current loop control in speed control of DC motor
As far as I read about speed control of a DC motor, I have come out with the following statements:
Speed control of a DC motor can be acheived by controlling armature voltage of that DC motor and ...
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Calculating the torque and RPM requirements for a DC motor
Say I'd like to calculate the motor specs required for lifting a 1kg weight at a rate of 1 m/s. How much torque and RPM should the motor have, assuming a wheel radius of 1cm?
My calculations are as ...
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Can I use a motor as a rotary encoder?
Let me preface this by saying that I'm not an expert, nor do I conclusively understand how op-amps work, but I have a strong suspicion that this should be possible, at least crudely.
I have this idea ...
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Armature current control of DC motor
In DC motor speed control, we usually build an inner current loop that serves to control the armature current so the speed/torque of the motor.
Let's assume that we want to control the speed of a DC ...
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Where do I add the motor leads?
I'm making a small type light house and wanted to know where I add the positive and negative leads from the motor onto this circuit board?
I'm just a DIY-er and know hardly anything about circuit ...
