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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2answers
38 views

How to select a DC motor parameters

I would like to know how to calculate or select DC motor parameters when knows some parameters. Knowing parameters: Speed range: -2000 to 2000 rpm Torque range: -65 to 80 Nm Expected friction torque:...
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41 views

How to amplify signal for driving a more powerful motor

I have a 0-12V signal supplying max. 10A, which drives the 12V DC motor with peak consumption of 10A. I'd like to replace this motor with a more powerful 12V DC motor with the peak consumption of 30A. ...
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Motor Constants Understanding

I have a basic question regarding the constants of a motor. I want to know the name of the constants and their SI unit. Torque (T) = Kt x Flux x Ia Back EMF (E) = Ke x Flux x speed When flux is ...
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Can a DC motor rod go forth and back instead of spinning?

I have a vacuum cleaner which also has moping mode. Since a couple of days ago, the moping mode doesn’t function anymore and I wanted to see what’s behind this. So I opened the tray and found some ...
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Sabertooth 2x12 Independent Analog Mode

I am using an arduino Mega to control 4 DC motors with 2 Sabertooth 2x12 motor controllers. I am using the Sabertooth controllers in independent analog mode (1,2,3,5,6 UP.. 4 down). I have a simple ...
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41 views

Arduino DC Motors Not Working Correctly With The Servo

I m building a simple obstacle avoidance robot. Here I Typed the code. But there is a bug I cannot find . The Motors are not working properly when they intergrated as whole. when I check the codes and ...
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Need help on a DC motor rotor winding repair

I am new here and need help. My angle grinder not working, and found there are two enameled wire open ends at the cooling fan side like the pictures shown below. There are 12 slots sure 24 commutator ...
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1answer
29 views

Where to place hall sensors (BLDC motor)?

I have a BLDC hub motor (out runner type; 3 phase wires) for my electric bike. It currently has 1 set of hall sensors (3 pieces) and I would like to install a second set (3 more) for spare (in case ...
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How to deal with voltage sag from a motor starting

I have a buck converter LM2956, same as here stepping down voltage from 12 to 8 volts. A motor turns on from the regulated stepped down voltage, and when it does I get a voltage sag that drops the ...
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1answer
39 views

How to wire a PPTC polyswitch + blown indicator LED to protect a bi-directional DC motor from stalling?

I have the following setup and it works well as is, except that I would like to protect the 12V DC motors (Reverse High Torque Permanent Magnet 12V DC motor) with a PPTC polyswitch + a LED to indicate ...
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1answer
67 views

PWM motor control - weird voltage ringing issue

I'm having some issues with a specific 24V brushed DC motor I'm PWM controlling. I'm seeing some rather nasty voltage spikes and ringing on every PWM on and off cycle. All scope measurements are ...
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41 views

2 momentary switches to control a pump

I would like to use 2 momentary switches to controle a water pump (start stop). When you press start the pump should run until I press stop or there is a power outage. The pump should also be off when ...
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1answer
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Esp8266-01 module attached to Arduino resets when DC motor runs

Machifit JT80SL DC 3-6V Water Pump: 3-6v Servo sg90: 3-7.2v Esp 8266 01: 3.3v I have 2 Arduino Uno both has their own ac-dc power adapter. Lets say, 1st Arduino ...
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51 views

Single H Bridge to control multiple DC motors

I am looking to control multiple DC motors off of a single H bridge. I only need one active at any given time I need direction but not speed control. I'm not looking for a product recommendation, ...
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1answer
58 views

Powering an L298N's IC and an Arduino Uno R3 using an LM7805

Before i start i would just like to say that i am an absolute beginner at this, and this question might be a little silly. I'm trying to make a shield that'll go on top of an arduino uno. The shield ...
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1answer
29 views

How do I calculate the regulation of the generator in a Ward-Leonard system?

I have a DC motor with independent excitation, power by a ward-leonard system. The nominal voltage applied to the motor is 250 V. I have to calculate what regulation(%) to apply to the generator so ...
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1answer
64 views

Speed control of 30 amp, 90 volt, 4 hp DC treadmill motor

I have a 30 amp, 90 volt, 4 hp ya Cheng DC motor and I am looking for a way to control its speed. I can match the volts but not the amps, or I can match the amps but not the volts. I am using it on a ...
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1answer
50 views

Speed and efficiency of solenoid train?

I'm talking about a simple solenoid train as shown in below image that works on the same principal as a homo-polar motor. It consists of an electric cell (AA or AAA type) whose terminals are fitted ...
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39 views

Windshield motor with ATX power supply keeps shutting down

I need to connect my windshield motor (12V) to my ATX power supply from old computer. I've tested the motor on my bench power supply and i draws around 1,5A @ 12V, so it should be well in range of the ...
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How to protect my 555 timer against DC motor noise?

I have this circuit: (Sorry for such a bad schematic.) As you can see, there is a DC motor that gets power from 12V source, using a NPN transistor controlled by a 0-5V signal. Please note that ...
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1answer
58 views

Finding the overall transfer function and plotting root locus of a digital control system

I have started to learn about digital control theory and struggling with a particular diagram of a digital control system. The system is presented below: \$D(z)\$ is a digital compensator, \$G_{h0}\$ ...
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1answer
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How to find the transfer function of this digital controller and DC Motor?

I am studying digital control theory and struggling with a particular diagram of a digital control system. The system is presented below: \$D(z)\$ is a digital compensator, \$G_{h0}\$ is a zero order ...
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1answer
87 views

3D hologram fan display

Did not know where else to ask about this, so if it is off-topic I would gladly take some pointers as to where the correct place would be. I would like to make one of those spinning LED fans that can ...
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1answer
56 views

What is the exact formula relating a DC motor's input voltage and torque produced?

I'm trying to control a 12V geared DC motor with encoder through an Arduino by an L298D driver for my self balnace bot. Based on the angles from the attached gyro sensor and encoder, it calculates ...
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timed relay for flipping polarity

I want to hook up some kind of time delay relay (or whatever will work) to a small DC motor that when I flip a switch on it runs for lets say 5 seconds with normal polarity then when I turn the switch ...
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1answer
47 views

What value of inductance and type of inductor should i choose for my motor driver circuit? [closed]

I am current design a DC motor driver circuit for 24 volts and 50 amperes since the motors I am using take 25 amperes nominally. I will be using PWM signal to control the output. I was suggested to ...
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1answer
64 views

Can I replace a 2.80 HP Treadmill Motor with 3.60 HP both @130 VDC? [closed]

Is it ok to use the 3.60 HP motor to replace the broken 2.60 HP motor in my treadmill? If not why? Old Dead 2.60 HP Cont Duty @110 VDC/1939 Watts New Replacement - Will this work with the ...
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1answer
43 views

RS-550 DC motor controller 24V (35-70) A working range and a stall of 120A

I am currently designing a motor controller for a SUMO robotics challenge. Each of a two motor setup exhibits a (0.15-0.40) N.m torque resulting them pulling (35-70) Amps nominally and a peak of 120 ...
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1answer
83 views

Will beeping dc motors cause damage to the motors?

I have noticed from a drone (of a friend of mine) it has a feature that lets its motors beep so when it gets lost it can be easily found. I have some searching and this seems to be done by alternating ...
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2answers
42 views

How to predict and compensate for the dynamic and static resistive torque due to losses in a motor

I will have external torques acting upon an axle to which a motor is connected. I want my motor control system to fairly precisely compensate for most of the torque that the motor imposes on the axle ...
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Simple circuit to power a 4HP 180 V DC motor

Overview I'm trying to make a cheap simple circuit to power and control the speed of the motor. It's going to drive a pulley and be used as simple woodsaw. Problems Running the motor without a ...
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High torque low rpm BLDC Motor

I am creating follow focus system (motor with gears that moves camera lens ring). Vast majority of such systems use low Kv high torque BLDC motors - similar to the ones used in gimbals. I think it is ...
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1answer
53 views

Reversing a DC motor with an on-off switch, relays, and limit switches

First post here, please excuse my electronic ignorance. I am trying to design a 12V circuit to open and close the nitrous bottle on my race car. Here are the specifics of the design: It needs to ...
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How to calculate armature current at startup of a PM DC motor?

You pick the following commercially available DC motor with permanent magnet excitation. Write a MATLAB script that simulates the transient and steady state characteristics of DC motor above. ...
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2answers
117 views

Why is 12V Common for PSU

Looking around at various PSUs and I see 12VDC show up pretty commonly, both for PSUs and motors they drive. Can anyone tell me some of the history and/or rationale behind this? E.g. is that a ...
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1answer
53 views

Is there a reason to use 4 diodes instead of 2 when controlling a motor with L293B?

I am looking at the datasheet of L293B and there are some usage examples provided in it: Is there a reason to use 4 diodes instead of just 2? Why are these connections needed here in the first place?...
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1answer
44 views

Inductors in DC motor drivers

I've been making some research on DC motor drivers and I noticed that most medium power boards don't use inductors, but boards that can provide high current do, like this one: https://www.cytron.io/p-...
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PWM duty cycle meaning.. how does it affect current through motor

I have a big misunderstanding.. when we say the pwm is 10% the motor should be off for a longer time.. But the motor driver draws most current at 10% pwm .. I am not able to understand this concept..
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Is a rotor of an electrical motor charged with electricity?

This might seem to be dumb question, but as far as I understand it: An electrical motor is made of a rotor and a stator. The stator is electrically powered: it has a solenoid and current passing into ...
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71 views

Flywheel current doesn't change direction

The motors are permanent magnet DC motors. First I power the motor with a flywheel and a motor with no substantial load. (same kind of motor). simulate this circuit – Schematic created using ...
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2answers
146 views

How to calculate speed of DC Motor?

I have a DC motor rated 24VDC@200mA driving at 40% DC and 20% DC(PWM) should run at what speed? Is there any formula to calculate the motor speed based on duty cycle
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1answer
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How to turn a motor while obtaining the angle it turned?

I need a device where it can turn mechanically, while be able to measure the angle of which the motor turned. One solution I thought about was to connect the motor with potentiometer. However, is ...
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72 views

Motor stall detector with a voltage divider in parallel to the motor and ADC: it does not work as expected

I'm trying to replicate a motor stall detector I found on a PCB of a commercial device (chinese). This is the schematic: I'm using an ESP8266, resistors with same value as in schematic, two MMBT3906 ...
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2answers
246 views

Can a low amps 48v battery handle big DC motor

I have a 48V DC motor, 3500W at 300A, combined with a dc controller with 60A constant and 120A peak discharge rate. Can a 48v li-ion battery with 20A constant and 40A peak discharge rate, safely ...
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How do we reduce or nullify the back current from the wheel motors of the modern electric vehicles?

As expected, this EMF opposes the voltage of the source that created it; that is, the motor becomes a generator as soon as it is turned on, and the opposing (or counter, or back) EMF will increase ...
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1answer
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VNH5019 motor controller

So I want to use the VNH5019 motor Controller shield for the Arduino Uno for a project. My question regarding this is the voltage of the motors. Since they differ from motor to motor I'm not sure ...
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1answer
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For a constant load, how does increasing supply voltage increase speed of the motor?

For a given load: Increase in supply voltage results in increase in armature drop. Increase in armature drop results in higher armature current. But we know that speed is inversely proportional to ...
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1answer
45 views

L6202 H-bridge keeps breaking when switching directions

I chose to use the L6202 H-bridge IC because it has built in dead time as well a thermal shutdown protection. However I've already broken multiple of these from what appears to be current spikes when ...
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2answers
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Driving torque and load torque of a pmdc motor

This question is a follow up to the question I had asked on electric torque of DC motors I've done my research but couldn't find a satisfactory answer. I would appreciate if the answer was told with ...
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3answers
117 views

Understanding electric torque of a motor

I'm missing something fundamental in my understanding of the torque of a motor. Consider the following analogy: I have a 10kg dumbell on the ground and a 1kg dumbell next to it. Let's say that I ...

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