An electrical actuator converting electrical energy into rotational motion.

learn more… | top users | synonyms

0
votes
1answer
101 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
40 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
151 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
73 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
vote
0answers
96 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
181 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
206 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
46 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
116 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
104 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
143 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
174 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
105 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
112 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
334 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 ...
2
votes
2answers
358 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
59 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
404 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
102 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
36 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
130 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
191 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
111 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
50 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
75 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) -> ...
3
votes
3answers
233 views

How do DC motors work with respect to current, and what consequence is the current through them?

Motors in general have always been a difficult subject that I cannot fully wrap my head around. Considering DC motors, what determines the rate at which the motor spins? It was my understanding that ...
-2
votes
1answer
110 views

Controlling throttle valve with PWM and TIP120

I'm trying to achieve this. He's using a darlington transistor, so I started looking for an appropriate circuit. I've made that, with a TIP120, using a 1k4 resistor (instead of 1k) and a 1N4007 diode ...
0
votes
2answers
99 views

What is interpolation in encoder?

I need to buy a servo motor and need high accuracy control. A sales engineer tells me that the servo motor has 1024 encoder, and its servo drive has interpolation technology which can make the ...
0
votes
1answer
63 views

Torque measurement of induction motor

what device should be used to measure the torque of 3 phase induction motor? The motor is of 3000 rpm or greater
2
votes
1answer
167 views

DC motor starting and stopping

I'm powering a motor, and instead of rotating at a constant rate, it rotates roughly a third revolution every half second or so; the rotation keeps starting and stopping. There's no load on the motor, ...
0
votes
1answer
122 views

L293D outputs different in different motors. Are there different types of DC motors?

I recently picked up a used Spider King RC toy from a thrift shop (http://amax-toys.en.alibaba.com/product/337890538-212191267/rsc_9021_RC_Spider_King_car.html). It had no remote or battery charger ...
1
vote
1answer
69 views

How we can control the DC motor [closed]

I have an DME60B motor (DC) with 24V and 490 RPM. I want to turn it on every 8 am Daily and to work for just 5 min. if we want to change the dirction of the motor after 2.5 min to work reverse? what I ...
-4
votes
1answer
164 views

How do I build a light-activated motor? [closed]

I'm trying to build a motor that is activated when light shines on a photoresistor/transistor (can anyone explain the difference?), but I'm totally lost right now. I can only utilize wires, batteries, ...
1
vote
1answer
70 views

Driving a Servo a Motor

I want to drive a servo rc motor I just purchased, I am a newbie in the electronics world. I would just like to test out the servo motor first and actually get it to move. So far I have figured out ...
3
votes
4answers
250 views

Is my H-Bridge design correct

Hello everyone I realised after burning through 6 L293D's that they were getting old. I hated them mostly due to the fact that they were fragile. I also burned 3 of them because of static electricity. ...
1
vote
2answers
104 views

Part numbers on Johnson motors don't match their catalogures

I've bought three motors which look like cordless drill parts, DC. I intend to use motors 1 & 2 to drive the left and right sides of a robot, and the third will probably be useful for a future ...
9
votes
3answers
601 views

Are there any types of DC motors that self-lock themselves?

I have a small DC gear motor which spools a plastic line. Once I've engaged the motor to tighten the line, I want to lock it in place so that the line doesn't unspool. I would then like it to remain ...
1
vote
2answers
318 views

Shaded pole motor coil calculation, rewind 110v motor to 220v

I have yj61 series motor. Something like this It's rated AC120V 60Hz 3000RPM and was damaged by accidental connection to 220v mains. I can't find suitable spare motor, so I have to rewind this one ...
0
votes
1answer
140 views

Useless Machine geared motor

I am attempting to build a “Useless Machine” from scratch. Here is a video of the device: http://www.youtube.com/watch?v=Z86V_ICUCD4 . Also [if you want to], Google "The Most Useless Machine EVER! ...
0
votes
1answer
139 views

What are the DC motor wires in the picture for?

I'm given a DC motor without any specs. But it is not pwm thats I'm sure. The point is there are 3 wires brown, red-black. red-white. I cant find out how to power the motor and which wire is gnd or ...
0
votes
1answer
90 views

NEMA 17 stepper motor [closed]

I'm going to use 4 NEMA 17 stepper motors to build a quadcopter. I need to find the maximum upthrust that a single motor can give with a propeller of length 6cm (end to end). The holding torque of the ...
0
votes
3answers
160 views

Lifting small objects at very low speed

I'm working on project where I have to lift up/down an object about 5-7 kg heavy at speed of about 6.6 mm per second. Does anybody have an idea how to do that? I was looking at asynchronous motor ...
1
vote
2answers
104 views

How is a synchronous 214 rpm motor for a 50 Hz mains possible?

According to Wikipedia at steady state, [...] the rotation period is exactly equal to an integral number of AC cycles. Now I have a brief description of a three-phase motor designed for 50 Hz AC mains ...
0
votes
3answers
1k views

Motor speed control using arduino and quadrature encoders

I am trying to get precise control over the speed of rover 5 based robot. It has four PWM controlled motors and 4 Optical Quadrature Encoders. I am using 4-channel motor controller with rover 5 ...
0
votes
2answers
84 views

Input power & Torque to a DC Motor

I have an DC motor connected across a 12V supply, I got the rpm around 200 rpm. Armature Terminal Voltage of 9V. Winding resistance = 1ohm How can I find the torque of the motor and the Input power ...
1
vote
2answers
143 views

Will a 12v 2000mAh battery overpower(and damage) a 1.2a DC motor?

Sorry if this is Electrical Engineering pre-school. I'm a software guy that hasn't taken a class involving voltages for 10+ years. I'm working on an Arduino project that will have to be fairly ...
6
votes
1answer
251 views

Weird servo mechanism

I want to use a servo taken by a radio-controlled car. However, I found out that wheels' rotation (front wheels) is not performed by a servo, but from a motor to move the wheels and a mechanism for ...
3
votes
1answer
97 views

How can I tell what type of capacitor to use with an electric motor, if any?

I understand capacitors are used to reduce electronic noise from motors. I bought a little 4-motor car chass off of ebay and I wanted to know a) Does this motor already have a capacitor built in to ...
2
votes
0answers
98 views

Controlling a treadmill motor

I'm recycling some spare parts of an old treadmill for a new project. I have the motor with its driver board, the elevator piston and the controller board. All works out of the box, but I need to ...
1
vote
2answers
148 views

Why is this capacitor hooked up to a 9volt electric motor?

I took apart a sharper image personal fan run by a 9volt battery. I understand a resistor is sometimes necessary, such as when preventing light emitting diodes from burning out. How about a 9volt ...