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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21 views

Power consumption when DC motor runs on battery

I have small doubt about power supply selection for a running motor. I have a small dc motor, which is rated for 12V , 3A(rated ). When the motor runs with a load 4000N, the current consumption is ...
-4
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3answers
59 views

What could be the voltage of this common DC motor? [on hold]

Below is the picture of a common DC motor usually used in electronic toys. This motor is quite common so I guess someone may be knowing it's voltage and how much current it draws. I could've tested it ...
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0answers
29 views

How to read data from a rotary encoder with ATmega328 [migrated]

I'm using a home made "bare bones" Arduino, made with the ATmega328, and I need to read angle data from a geared DC drill motor, turning at speeds between 0 and 450 RPM. This is so I can use it as ...
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2answers
33 views

Capacitor quenching circuit across Brush and Commutator of DC motor

To reduce the spark between brush and commutator segment there is capacitor and resistor spark quenching circuit is placed between each commutator segments. please find below images for detail idea ...
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2answers
39 views

DC Motor control setup and circuit design. 1.5Hp continuous duty @ 95v dc

I have a DC treadmill motor rated at 1.5Hp @ 95v Continuous duty, though the motor label also states that it is a 2.65HP motor and that the amperage is 21.4. I would like to be able to SAFELY run and ...
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0answers
46 views

How does the current draw of a motor work?

I have a motor from an old drill and a 2.2 amp power supply. I want to connect the motor to this power supply, but I want to check if I have a good understanding of what will happen first. Assuming ...
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votes
3answers
40 views

CLL(Capacitor long life)capacitor filtering to reduce the current spikes

if we are using capacitor between the coomutation segments of brush dc moto then it reduces spark generation. as main function of commutation system is to reverse the current in the coil. by using ...
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0answers
16 views

Project on light source tracker (DC motor selection)

I'm doing my semester project on light source tracker(1-D only), I'm basically using a Microcontroller to control the dc motor but I'm confused about which dc motor should I use. I have to connect a ...
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0answers
70 views

How to drive a small DC motor with very low voltage from an MCU using PWM?

I have a small motor pulled out from a tape recorder. I need to drive it slowly - no more than 20 RPM. The motor is capable of running at this speed and keeps the velocity very well with voltages as ...
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2answers
73 views

How to choose suitable battery that will supply enough current?

I'm looking for a light-weight 12v battery that will drive 4 DC motors for few seconds burst at stall current (1.4 Amp each; according to datasheet). How do I know which battery will supply enough ...
0
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1answer
33 views

Load Torque Profile of two coupled electrical machines

I am trying to learn about the torque profile of two coupled machines. I believe that if a DC motor is driving a DC generator of identical ratings, the generator will exert rated torque on the motor ...
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1answer
58 views

Controlling dc motor in arduino with and without a load

I wonder if there is an alternative solution to this problem: I have a 3v water pump being controlled by an arduino, which pumps water out of a bucket. I would like the pump to turn off once the ...
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0answers
18 views

Noise with PWM Motor Driving Circuit

I'm using the circuit of this question: Problem with PWM motor driver The problem of the past question is solved using a 1200k resistor and lowering the frequency to 4 Khz: now I have noticed, using ...
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1answer
27 views

DC motor driving

I am using SRF-300CA-11440 DC motor in my application. ( 6V max ) (Datasheet for DC motor) For motor driving purpose I am going to use L293D dc motor driver chip. L293D datasheet suggests "The L293D ...
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1answer
25 views

Problem with PWM motor driver

I'm using my custom circuit in the figure for driving dc motors. I'm providing a PWM (25khz). While trying the activation threshold (minimum duty cycle that activates my motor) experimentally I have ...
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votes
2answers
74 views

Controlling a DC motor directly with Raspberry Pi GPIO without any external IC or Transistor

I need to control a DC motor without the use of an external IC or transistor with the raspberry pi GPIO. I do not need direction or speed control. All I need is the motor to controlled by raspberry pi ...
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2answers
50 views

Choosing the right LiPo Battery

I have a project that has 14 DC motors, 8 of them have 6A nominal current the rest requires 5A. I'm thinking of using 12 LiPo batteries each 5000mAh, 30C~40C, connected in parallel so that total I'd ...
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1answer
41 views

Testing an h-bridge using the power supply and/or signal generator to control a DC motor

I'm using the DRV8836 (datasheet here) from Texas Instruments and can't seem to get it to work. Does it require a PWM (pulse from the signal generator) or am I able to drive it with only the DC power ...
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1answer
31 views

Running a 4-DC motor Circuit

Currently I'm doing a project where I am simply trying to get a robot to move forward without code by using say a push button or a potentiometer. I plan on moving on to micro controller later, but ...
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2answers
72 views

Circuit design recommendation to prevent a failing regulator

I designed a PCB that contains, among other things, a switching regulator circuit and an H-bridge for a DC motor. The whole circuit is powered by a 15V Lithium battery. The switching regulator ...
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0answers
12 views

Determining V/RPM relationship based off of RPM/torque/current curve?

I am trying to determine what voltage will give me a X RPM of a motor. The motor can be found here The pdf showing the torque/RPM graph can be found here. I have an idea of how to go about solving for ...
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1answer
46 views

High Voltage MOSFET Controller - Random Failure

I have a 120V DC Motor that I need to control the speed of. I am doing this through a High Voltage PNP transistor (MJW21193) rated at 250V and 16A with a peak of 30A as I understand it from the data ...
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1answer
33 views

Stepper Motors : KG.CM Torque : Does it maintain the torque when connected to a rod?

I am currently building a machine for a school project.I have a pivot point and wish to use a stepper motor to turn the base at an angle. The base is carrying a load of approximately 10kg. I was ...
4
votes
2answers
937 views

Why do I keep burning my mosfet?

Following this question, I ended up with the following diagram to drive a custom made dc motor using Arduino (omitting the 5V and 12V power supply stages which work properly): I keep burning ...
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1answer
28 views

Current problems with DC motor interacting with a H-Bridge IC

How do DC motors work in stall I have been told (from my engineering project seminars at uni) that if your motor has a stall current of 5.6A, you should use a 5.8A fuse to cut it off after it begins ...
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0answers
61 views

Nano destroyed? [migrated]

Board: OE Gravitech Nano Is it possible to destroy the board if there are a voltage on a Analog pin while the board is not powered? I have a application that use a analog (speed) voltage 0-4,9 from a ...
0
votes
1answer
39 views

Transistor based relay driver for DC motor is not working with 12V-8A DC motor?

I am trying to run a 12V-8A DC motor from pic microcontroller output pin via relays(28V-30A output rating). It only starts for a split second and stops. Where as small DC motor runs perfectly on the ...
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2answers
98 views

Drive DC Motor with H Bridge(H Bridge turns off too slow and problem with current monitor)

I have two questions about my circuit, drving DC Motor with H Bridge. The picture below shows my design and how I drive it with signals. For example, when I make the motor rotate forward, I give ...
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votes
1answer
54 views

How to reverse the direction of operation of the motor?

For Synchronous buck, half bridge converter, how to reverse the direction of operation of the motor? That would be great if you could explain me with the circuit diagram.
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0answers
33 views

Battery life vs more power?

We are making in my intro to engineering class, an object that can travel about 20ft. We are only allowed a 1 AA 1.5v battery and motor. I was thinking we could trade battery life to increase the ...
1
vote
1answer
53 views

H-Bridge controlling circuit

I'm in need of an H-Bridge capable of driving moderate-high current for motors on a small car (7A peak, 2-3A nominal, 12-14 VDC), and I'm hoping to control it with two (2) digital pins (5 VDC). I've ...
0
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0answers
36 views

Dc Motor drive setup

I would like to ask why in this setup the dc motor is parallel to the fet and what is the reason for the diode. Thank you!
0
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1answer
60 views

PWM speed control for 90vdc motor

I built this circuit and it seems to work if i use a the same power supply to the motor that is powering the IC. I am using an LED in place of the motor for testing. But the circuit does not work ...
0
votes
1answer
41 views

Purpose of Charge Pump in Motor Driver IC

I have seen and understood the purpose of charge pumps. Used for pumping voltage levels in case of RS232 transceiver IC's. But most of the motor driver IC's also includes a internal charge pump ...
-3
votes
1answer
54 views

NPN BJT used for DC Switching Load [closed]

I am trying to learn some things for a class. This is not homework, just studying for an exma. It has to with calculating values when using a NPN BJT. I have five (only three because other 2 were not ...
0
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0answers
86 views

issue with 16x2 lcd and DC motor

i am using 16x2 LCD for my project,aim for the project is to control dc motor using gsm,lcd displays the status of the motor,motor is controlled by the relay.but whenever motor starts the LCD become ...
-2
votes
2answers
67 views

Problem connecting motor to arduino

I am trying to connect a DC motor to an arduino. When I set it up like in the first image below, it works and the motor rotates. However, when I set it up in the second image it does not work, am I ...
1
vote
1answer
111 views

Basic Robotics Help. Variable motor speed control by ultrasonic sensor input on arduino

First, thank you for taking the time to read my post. I am attempting to use an ultrasonic sensor to control a DC motor using the PWM output of an arduino. Fairly simple, I know, but I'm just a ...
0
votes
2answers
56 views

DC Motor giving poor output waveform - how do I fix?

I am trying to make a DC motor controller with an H-bridge and PWM powered. The circuit diagram for the motor controller is: The inputs can obviously only be on 1 at a time to prevent short ...
2
votes
2answers
183 views

How To Interpret PID Output in a Slow Response System

@Update: A few days have passed since I asked this question and I've had a chance to do some research based on the answers I've received from @R Drast and @Spehro. I'm not sure this update is the ...
0
votes
1answer
48 views

Using an AC speed controllet with an rectifier and dc motor

I salvaged a 12 amp motor from an AC lawnmower and wanted to use a motor controller to reduce the speed. This is the controller I used http://www.amazon.com/gp/aw/d/B00GMBYFRK. The motor is a dc ...
1
vote
1answer
49 views

5v dc drops to 2v when applied to L293d [duplicate]

I have a 5v dc supply generated from voltage divider and this 5v is used to drive L293d. But the problem is as soon as 5v supply is given to L293d the voltage drops to less than 2v. what could be ...
0
votes
1answer
51 views

How to estimate motor current under load

How do you estimate the average current under a typical load of a brushed DC motor? I'm trying to size the right motor, motor driver and battery to propel a small two-wheeled platform using this ...
3
votes
1answer
217 views

Analysis about H bridge to drive DC Motor

the picture below shows my design about driving DC motor with H bridge. There is one problem, for example, I turn on the U1B and U1A(use PWM to turn on U1B and the U1A is always turn on when I make ...
0
votes
2answers
104 views

Applications of PWM?

I know the application of PWM is controlling the brightness of led or DC motor speed, but I don't understand it, why when we change the duty cycle, it change the brightness or motor speed ? Can you ...
1
vote
2answers
80 views

Convert 3v solar cell to 1.5v

I recently bought a solar cell rated at 3v and 200mA dc to power a 1.5v dc motor that is used as an air pump for my aquarium.All the 1.5v solar cells available here have low ampere like 50mA or so. ...
2
votes
1answer
51 views

Help decipher DC brushed motor ratings

I have two same sized DC brushed motors found in different variants of an appliance of the same brand. They are possibly equivalent, but they have different labels. One is labelled with: ...
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1answer
88 views

Power supply turning off when a motor is stopped then quickly turned back on?

When I stop my 12V wiper motor, then turn it back on within a second or so, my 12V 5A cheap power supply turns off for less than a second, and comes back on, then turning on the motor. What causes ...
0
votes
1answer
55 views

Does a motor's stall current change with applied voltage?

In other words, if the load is great enough, will a 110V, 18A rated motor being run at 5V stall at the same current as if it were run at 110V? I'm asking because I'm currently working with a ...
0
votes
1answer
64 views

High-current motor on isolated circuit causing servos to move

I have a robot with several servos controlled by an arduino. Also attached is an electric airsoft gun, which draws considerable current. The gun is on an independent circuit with a separate battery ...