An electrical actuator converting electrical energy into rotational motion.

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2
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1answer
75 views

Does L293D consume power when not in use

I am designing a robot using the L293D motor driver, and I have just successfully hooked it up to my micro controller. I am using two batteries, one two control the motor and one to control the pic ...
0
votes
1answer
60 views

Determine power needs of a motor

I recently stripped a motor out of an old 2887-z gaf dual-8 mm projector. I'm not even sure if the motor AC or DC, although I suspect its a brush less ac motor. Unfortunately, I disposed of the ...
2
votes
1answer
85 views

Laser controller project

The context is that I want to build a tunnel laser effect, that modulates the angle of the cone according to a sine wave. The purpose being, to create a cool Borg weapon effect for a Star Trek Borg ...
1
vote
1answer
60 views

Do servo motor specifications take into account the gear ratio inside?

I know this question may not belong here but I assume this is most likely where the most well informed people can help me. I am looking at buying a servo motor for a an application that must be able ...
0
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0answers
238 views

Control 12v motor with 5v PWM

I have 5v PWM (555 generated) and I want to control speed of a motor using it. The problem is my motor is 12v and by diving it with a 5v PWM I can't reach full speed of a 12v motor. my pwm generator ...
2
votes
1answer
146 views

Power supply problem with L293D

Recently I was trying to drive two motors with atmega328 and L293D motor driver IC. The power supply section is shown below I used a 12V battery with high current driving capability.The motor was ...
1
vote
0answers
554 views

How to tell whether a motor is an AC or DC motor?

I watched a youtube video http://www.youtube.com/watch?v=hT3jJRGVdW4 The man says : by spinning the motor to see whether the output is AC or DC, then it can tell whether the motor is generating AC or ...
1
vote
2answers
101 views

H-Bridge ic not working as expected

Hi I am using the SN754410 h-bridge driver to try to control a motor using two switches. As I understand the SN754410 should be identical to the L293D. I have hooked up a circuit and I think I have ...
2
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2answers
345 views

How many servos can I run on an ATtiny85?

This is my first time asking a question on this website, so please correct me if I'm doing something wrong... I have been working on a small project which runs three Servo motors on an ATtiny85, ...
4
votes
2answers
2k views

What is the purpose of the Motor Run Capacitor?

Looking at a control box for a marine Air Conditioner and it has a HUGE capacitor in it. The schematics label it a "Motor Run Capacitor", but I always thought it was just used to start the motor. ...
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votes
2answers
50 views

Change the motor or the gears?

I wonder, what's better to achieve some given torque? To chose a motor with the Kt that gives that torque or to choose a reduction drive that will output that torque from a given motor? I wonder ...
1
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0answers
104 views

Use a 2N7000 in place of 2N2222A

Here's a description of both circuits. A ring shaped magnet is mounted on a brass axle and a set of bearings. Coil A and Coil B are wound on the same core. The magnet is placed about 1/8 of an ...
2
votes
1answer
174 views

H-Bridge freewheeling current

I'm building an H-Bridge to drive some motors I have around. I'd like to have a bridge that can be powered by different power sources, for example batteries or atx power supplies interchangeably. ...
1
vote
1answer
132 views

(Arduino UNO) Random Button inputs due to change in code

(First of all: Sorry for the Title.. I really don't know how to describe my problem in one Sentence) I'm an arduino beginner. I build a two button control for an electronic motor. simulate ...
1
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0answers
159 views

Old variable speed AC motor wiring

As a disclaimer, I have a little electronics knowledge, but I'm no expert. I've been given an old 1940's Hunter fan and I'm working on fixing it up. I took the base apart and wiring is pretty bad - ...
0
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0answers
97 views

Need Help in creating a driver for a 220v AC Servo Motor

I am a new to electronics and have been working on to design a Motor Drive for comonly available Serveo motors like: http://www.alibaba.com/product-gs/1580332915/servo_motor_used_in_CNC_machine.html ...
0
votes
1answer
58 views

Serial port controlling a motor bridge--unknown bug

This is part of a project where I wanted to bypass using a microcontroller and control motors directly with my laptop. I'm using a usb-to-serial cable and use the serial RTS and DTR to control a ...
0
votes
2answers
203 views

What voltage of Li-ion battery to run 24 volt motor (6 cell or 7 cell)

I have the option of replacing my aging and almost dead lead acid batteries with Li-ion to run a 24 volt motor. The data sheet for the Li-ion cells report the cells as having a nominal voltage of 3.8 ...
0
votes
1answer
136 views

L293DNE Always On

I am hoping to put together a circuit that will control a slot car track from a 30V 3A power supply. I have used the L293DNE as I thought it would cope with the extra load. The circuit is based on ...
1
vote
1answer
793 views

How to wire external power supply on stepper motor

I followed this tutorial to setup my stepper motor. Now my stepper needs 12V and not 5V. So I was wondering how I can add an external power supply without destroying my pi. I found this: But it ...
0
votes
1answer
54 views

What are the effects of the different design parameters when building a linear motor?

I am trying to build a so-called "ironless" linear motor. Conceptually, they are quite simple. Linear motors, generally speaking, are just like rotary motors but "unrolled." As I understand it, the ...
-2
votes
1answer
184 views

difference between a DC motor and gear motor [closed]

Isnt DC motor the same as gear motor? Because what is the use of dc motor without gears?
-1
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1answer
68 views

is it possible to use a circuit to reliably measure when a motor has 'stalled' [closed]

ive been fixing my electric garage door opener and it got me thinkin... the motor turns a geared chain that moves the door up and down. there is a small mechanical device attached to the mechanism ...
0
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0answers
51 views

Where can I find synchronous machine parameters to use in a PSCAD simulation?

I am trying to observe a loss of field on synchronous motors of different types and sizes. PSCAD seems to want a DQ equivalent circuit. I've Googled the problem and tried several manufacturers' ...
0
votes
1answer
127 views

What kind of motor would I need to turn this central heating valve?

I often forget to turn my central heating down when I leave the house, so I thought it would be cool to make a device that could do it for me and to have a website where I can check and change the ...
0
votes
1answer
126 views

H-Bridge diode makes the motor go faster

I am making a little robotics project were my robot spins around a shaft. Since it can't spin a full 360º turn I placed some limits in the software but just to be sure I also placed two limit switches ...
0
votes
2answers
47 views

What is the possible reasons that cause the different motor strokes of two directions

The question may be a little too specific since it refers to some special choice of the motor parts that may not be used for everyone, yet I would like to learn about the general debug methods if ...
0
votes
2answers
524 views

Can I run this motor off of this solar panel?

I am trying to build a solar powered boat, and I have decided upon this 5V, 500mA panel. I can buy 3 or 4 of them to get up to the necessary voltage and amperage. The problem I have is that I can't ...
1
vote
1answer
115 views

DC Motor Control - h-bridge pulsing strategy?

Question is with regards to a DC motor controller built around an Allegro A4940 and four discrete FETs. There are at least four possible strategies for driving the FETs, and I'm struggling to ...
1
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0answers
107 views

Control Loop Frequency [closed]

I haven't started tuning/setting up my controller(s) yet, but already having trouble with the control loop frequency. This code shall later control the position of a X-Y stage. The code: ...
4
votes
2answers
242 views

Ideas for precisely moving a small object in 2 dimensions?

We would like to precisely control the position of a small object in a X-Y plane. The object we are moving contains a LED diode and some optics. The restrictions are: The total area is 9mm x 6mm ...
2
votes
3answers
331 views

PWM'ed DC motor not running when loaded

I am trying to build a robot with the Arduino Uno and the H-Bridge SN75441. The robot has 2 1.5V rated motors. I set it up with this tuto: http://www.mlbelanger.com/arduino/ard-bot/ So the circuit ...
0
votes
1answer
105 views

Using a solar car battery charger to power a solar boat? [closed]

I am participating in a contest in which I need to build a solar boat (it has to fit into a 1.5' wide by 2' long by 1' high box and draw less than 2"). I currently have a 12V solar panel made for ...
2
votes
2answers
165 views

DC Brushless Motor For Electric Rover

I'm an industrial designer, and am working on building a small electronic rover, however I've been doing some research and I feel a little bit lost in terms of what motor is best for me, The device ...
-1
votes
1answer
136 views

What mechanic for opening the roof window of a Greenhouse [closed]

I'm asking myself what would be a cost effective mechanical unit for opening a 30x30cm pitched roof window in my greenhouse with my microcontroller STM32F4? At the moment the window still has a glass ...
4
votes
2answers
349 views

Result of constant current through DC motor under different loads

I've done some research on brushless DC motor and have a few questions what would happen when a constant current is sent to a DC motor. From my understanding, the current is directly related to the ...
1
vote
3answers
296 views

What sort of electric “motor” would I need to launch a puck?

As the title suggests I am looking at making a hockey puck launcher so I can do some off ice technique training as a goal tender. I have no one to train with so I wanted to create a puck launcher ...
1
vote
3answers
145 views

What exaclty is the purpose of a Hall sensor in a BLDC?

I was reading an articles about brush-less DC motor, used in CPU fans, form this link. First I thought that the Hall sensors are used only for measuring the speed, but that is not correct, it has ...
1
vote
1answer
178 views

Removing jumpers from an L298N Dual H-Bridge

I've got an L298N dual H-bridge which I'm using to control two DC motors with an arduino. I want to be able to control the speed of the two motors using PWM. My understanding is that I need to ...
0
votes
1answer
518 views

Alternative to easy-driver (or adafruit motor shield ) on breadboard [duplicate]

I'm up to implementing bipolar stepper drivers with STEP and DIRECTION inputs just as like easydriver and pololu stepper drivers but that on breadboard.Earlier I was using L293D to do that , but it ...
3
votes
2answers
1k views

Purpose of the diode and capacitor in this motor circuit

I'm hooking up a small DC motor to an arduino using an NPN transistor using the following diagrams I found online: The circuit works, and I'm successfully able to make the motor run. Now, I'm ...
0
votes
0answers
61 views

Two wire circuit of H-bridge as Bipolar stepper driver for CNCs and 3D printer and stepper motor vibration and noise issue [duplicate]

So after searching a lot and looking up every Jack and Jill's website for 3/4 axis cheapest DIY stepper driver for the 3d printer and CNC. I have come to the conclusion that using L293d with ...
1
vote
1answer
716 views

G-code compatiblity with H-bridge L293d

I'm trying to make a 3 axis bipolar stepper driver and I think using L293Ds and Arduino is the best cheapest option. I have seen people using grbl to run their steppers easily but with grbl they ...
0
votes
1answer
152 views

Unused slots in the stepper Motor

The motor I am talking about has six wire slots of which two are unused and wires coming from the motor are restricted to four (4 to 4 jumper connecting wires are there to connect the motor ).So why ...
0
votes
0answers
42 views

Why do we use variable reluctance steppers?

AFAIK, variable reluctance steppers have non-magnetic soft iron teeth and they align themselves so as to have minimum gap I don't understand what does this line mean? How does it align itself with ...
1
vote
2answers
153 views

Why do I need PWMs on Arduino but not on ATMega16 or PIC16 to drive the stepper motors with L293d?

Seems to me , I'm lacking some concepts here. From what I know is that PWMs pins are essential for driving the motors (as they can drive the motors at different speed with diferent duty cycle). So ...
1
vote
2answers
255 views

How do I know whether a circuit (originally for 5 wire) will work for four wire stepper motor?

There is a very old and popular instructable 3 axis stepper motor driver, http://www.instructables.com/id/Easy-to-build-CNC-Mill-Stepper-Motor-and-Driver-ci/ As clear from the image , it's a six ...
2
votes
1answer
163 views

Is there a way to get more PWMs from Arduino Board?

I want to control 4 steppers with Arduino UNO and I'm all short of PWMs.In every tutorial over the web they have used PWM pin , in that case I can at-most use only two steppers with Arduino.So why it ...
0
votes
0answers
70 views

Which would be the best option for driving the 3/4 axis stepper motor for 3D printers?

I have researched a bit over google and reprep websites and come across different circuits/methods to drive the stepper motors. Being a student only , I have budget issues and I want it to be less ...
0
votes
1answer
84 views

Components necessary to automate hand crank

I'd like to automate a simple crank on a rotating hex bolt thingy so I don't have to manually turn the lever/knob. I was planning on bluetooth module -> Arduino (or some easily programmable MC) -> ...