Questions tagged [motor]

An electrical actuator that converts electrical energy into rotational motion or sustained linear motion (linear motor). There are many types of electric motors. If the specific type of motor is known, it is helpful to use or add a more specific tag, such as dc-motor, brushless-dc motor or induction-motor.

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2answers
2k views

What to look for in a motor?

I am going to be making a small robot using a Arduino Mega ADK Rev3 with 4 motors, and about a pound of other stuff. This is the first time I'm doing any major hardware project, so I'm not really sure ...
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0answers
867 views

Router Speed Controllers [closed]

I would like to have a router speed controller that can keep constant torque at all speeds. I will be running the router at around 5000 rpm or lower. I tried a triac controlled commercial unit once ...
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1answer
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Recommend motor type to turn baby rocker, into auto-rocker

Would like to convert a baby bouncer (like this one), which requires continuous manual effort to rock it, into one that use electro-mechanical means to auto-bounce. However, my aim is to make these on ...
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Multiple motor speed control with a single triac

I have a requirement where I have to control the speed of 10 motors. The motors are 230V AC single phase motors. The speed of the motors need to be increased or decreased using a electronic controller ...
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8answers
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How are current and voltage related to torque and speed of a brushless motor?

I know that electric vehicles have different performances depending on battery and motor, but it's not clear how electrical and mechanical units are related. Can anybody please help? Will a 100V ...
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What is this type of motor called?

Firstly some background: I would like to make a magnetic stirrer, like the ones they use in chemistry labs: A small bar magnet sits inside the glass jar, while another bar magnet, attached to a ...
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1answer
291 views

Regulating a small clockwork synchronous AC motor

Is it possible to drive a small synchronous motor with permanent magnetized rotor to other speeds it is designed for? I tried to drive a small clockwork AC motor which is symmetrically build but ...
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1answer
155 views

determine motor amp draw before purchase

I am trying to buy a geared DC motor from a large, international auction site. However, most listings do not list the amp draw. The vast majority explain the motor like "12V 30rpm 25mm DC Gear Motor ...
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1answer
2k views

Driving low-voltage H-bridge directly from MCU

I need to drive a small (3.6V, <1A) brushed motor bidirectionally with a PIC MCU. My available space is extremely limited, so I'd like to use a single 3.6V power supply for both the motor and PIC, ...
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266 views

Controlling motors induvidually

I have four motors attached to each of the wheels of my car. Two of these motors are servo motors and the remaining two are 12V DC motors. Since I could not get a rack and pinion type steering mounted ...
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1answer
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How to test brushed motor rotor coils with a multimeter?

I have a Blendtec blender that just decided to break on me. The blender has an electric brushed motor that looks like this: http://www.ifixit.com/Teardown/Blendtec-Total-Blender-Teardown/1128/2 When ...
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How do I modify a small blower motor to be variable speed?

I have a small blower motor 120 v, 1.87 amps, and I want to make it variable speed. I hooked up a dimmer switch for a light bulb but it did not work very well. I went to a electronics store and they ...
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Relationship between frequency and current

Hello I have a simple question, I was reading in my Airplane Maintence book that in AC motors are frequency sensitive (I understand that) frequency changes can cause speed changes of the armature. ...
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Using electric motor to adjust blinds?

So I'm trying to do some insane home DIY with my room blinds. I'm trying to make them adjust (go up and down) automatically. Now for this, obviously, I will need a motor. The blinds I'm working ...
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3answers
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Arduino motor control

I am working on a project where I have to control a vehicle barrier gate like this: Our team has planned to work with Arduino but we are open to other suggestions. My question is, can I use a DC ...
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1answer
445 views

How can I use a transistor as a switch?

I'm trying to drive a DC motor using an external voltage source and control it using a transistor switch. It doesn't seem to be working during the simulation though. I know I must be doing something ...
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2answers
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Interfacing HEDS 9700 optical encoder with AVR atmega32

I'm trying to interface an HEDS 9700 optical encoder using an HCTL-2020 IC (or anything else) with my Atmega ( atmega128, atmega32, atmega16, atmega8 or any AVR-family based microcontroller, don't ...
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1answer
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DC motor vs AC motor weight considerations

For a given power rating, does a permanent magnet DC motor have a weight advantage over either a three phase permanent magnet synchronous machine, or vice versa? Or does it work out that they would be ...
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1answer
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Regulate DC-Pump throughput

Does anybody know whether it is possible to easily regulate the throughput of a DC water pump? E.g. one you would use for your pond or indoor fountain. I would like to avoid lowering the duty cycle ...
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2answers
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Stepper motor phase

I have a question related to stepper motors. What does the "phase" of a stepper motor mean? I mean when we say that a stepper motor is a 2 phase stepper motor or a 4 phase stepper motor, what does it ...
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1answer
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Switching a 3 phase pump using a solid state relay

I made a remote (GSM) controlled module for a 3 phase pump close to my friends house. The pump should run at night, and walking the 1km to the switch while they are sleeping is the problem. The ...
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1answer
430 views

controlling motor with PWM

I am using a RCS-Model-M2313 R/C Servo and I have managed to create a PWM. My problem is that my motor doesn't react as I was expecting. I would like to control the motor angle with the duty cycle but ...
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1answer
230 views

Motor Protection

I am having a control panel to operate a green house fan and pad lab. in this lab i am having, 2 fans 1 temperature sensor(PT-100) 1 humidity sensor 1 motor for water flow(2 HP) 1 motor for fogger (1....
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1answer
669 views

Controlling a Motor for test bench

This is my 1st question here and I'm stumped... I spent all my EE classes on programming and ICs. When it comes to AC and motors, I feel worse than ignorant and spent all day trying to research where ...
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What transistor should I use to power a motor from an xbee

I have a small motor what operates at 3.3V at 50mA (sorry no documentation) and a Xbee radio which outputs 1mW. I would like to allow the Digital I/O pins output on the Xbee to drive the motor ...
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1answer
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How to calculate the power requirements of a fan motor? [closed]

I bought a fan from the USA to use in Europe. The fan's specifications states the following: Requires a grounded electrical supply line of 120 volts AC, 60 Hz, 15 amp circuit. Here we use a 220V,...
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1answer
146 views

How do different kinds of motors behave electrically under operation?

This is sort of a follow-up to this topic: Overclocking my toothbrush I have since measured some numbers with my DMM. Remember this is a tiny brushed DC motor in a $5 toothbrush that I am driving ...
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Why are battery-powered appliances and tools specified in volts? [closed]

"Powered with a suction of 18 volts" Isn't this just a nonsensical "bigger is better" measure? The thing you really care about as a customer is the motor's torque or power or RPM or something like ...
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2answers
810 views

Continuously Measure 3-Phase Motor Current

What methods are there for continuously monitoring the current in a 3-phase servo motor for a CNC machine and giving an alarm when the current is less than some value?
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2answers
486 views

Switching regulator to power motor

I am trying to power my servomotor only for a short period of time (controlled by my MCU). I have seen I could use a switching regulator (3 pins). The thing is that I am working with really low power. ...
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1answer
6k views

How to choose an Electronic Speed controller?

I'm having a go at making my self a quad-copter and was wondering how one would go about choosing an ESC?. I've chosen this motor and this ESC, Is the ESC suitable for that motor?
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4answers
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Understanding motor constants Kt and Kemf for comparing brushless DC motors

So for a practical definition, the torque constant Kt specifies how many Nm of torque you'll get from the motor at a certain current? Is a bigger Kt always better? I am more confused about the ...
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What action is responsible for speed changes in a brushless DC motor?

Hi and thanks for looking! Background As a hobby, I enjoy tinkering with basic circuit building (often using Arduino) and lately I have mixed this hobby with another hobby of mine: building RC ...
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1answer
361 views

Electric Power Systems for a qudrocoper base on 30amp Speed Controller and NX-4008-620 - NX-4008-620kv Brushless motor

I'm in mood to put together my own quadrocopter. Just before I ordered parts wanted to some experts to tell me if configuration if compatible enough. Or maybe you have better suggestions for this ...
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3answers
406 views

Sending and getting commands through the Internet

I have a little chopper (adult toy to be exact) that can be controlled by the controller within 30 metres. What I have in my mind whether I can send commands to this toy chopper though the Internet, a ...
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0answers
77 views

open a vertical door with an arduino [duplicate]

Possible Duplicate: Using a motor to open doors iv attached a picture of what im trying to do. Open a vertical door on my wood work project. i just want to know what methods i could use to do ...
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3answers
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Using a motor to open doors

I have made a wooden case to hold both my Xbox 360 and my PS3. It's as wide as both consoles laid down next to each other and as high as the console. it has 2 doors on the front, one for each console. ...
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1answer
112 views

Stymied in search for an electronic lock [closed]

I'm looking for an electronic lock to secure a small, wooden box (breadbox-sized). The box is ordinary: one side of the lid is hinged against one side of the box. When I look for 'electronic locks' ...
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1answer
3k views

220VDC motor slow and jerking

I'm troubleshooting issue of a motor from a washing machine I bought from a garage sales. Based on the service manual, I'm suppose to replace the motor assembly. So I decided to take a closer look at ...
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2answers
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Synchronous motor mystery

Not too long ago I acquired an old ('70/'80) German flip clock. I found out that this clock is driven by a one-phase synchronous engine. I can't get the motor to run. I (carefully!) connected the ...
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2answers
5k views

use computer power supply to run motors

I have some 12 V motors, and the corresponding motors controlers like these here http://imgur.com/XBEww. Every other 12 V power supply I have seen is either very expensive or has extremely low amps, ...
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1answer
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How to identify a BLDC motor from a brushed DC motor?

I got 2 dc motors from a broken cheap RC helicopter. How can I Identify what type of motor it is? It has 3 terminals, but only 2 where used. It takes around 2-3 Amps of current at 3.5 V. Each trace in ...
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2answers
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Driving a DC motor forwards and backwards with a PIC

Say I have a DC motor which runs clockwise when current flows in one direction, and counter-clockwise when the current flow is reversed. I have 2 lines going in my circuit, +5V and ground. I have a ...
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2answers
363 views

need a circuit that can switch motor direction by photo or timer input

I have a reversible 115 volt ac motor that has its own internal limit switches to cut the power. It has 4 wires to the motor green-ground and red-hot ,black-hot, and white-neutral. If I have the red ...
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5answers
1k views

Overclocking my toothbrush

I use these toothbrushes: http://www.amazon.com/Oral-B-Advanced-Toothbrush-Vibrating-Bristles/dp/B00336EUV8 They tend to run out of battery quite quickly. I'm happy to keep buying more because ...
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2answers
1k views

Unknown motor, specifications interpretation and use

I got a motor on the picture. Does anyone know what it was used for? My main question is if is it feasible to use it as a barbecue motor or is it too strong? Can I connect it to one or three phases ...
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1answer
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Soft Starter Sizing for No Load Testing of Motors

Don't know if this would be more appropriate on any other stackexchange site but my question is : How do you evaluate the sizing of a softstarter for no-load testing of an induction motor ?? For ...
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2answers
852 views

Rotating Platform That Starts and Stops Incrementally

I'm not sure this is the right place to pose this question, as it probably encompasses more than one field - EE, ME, programming, etc. But I'll ask the question anyway and hope that someone might ...
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1answer
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Coordinate transformations

Today I started to get involved to the coordinate transformation especially the Alpha–beta transformation and Dqo transformation: According to the wikipedia: $$ \frac{2}{3}\begin{bmatrix} 1 & -\...
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5answers
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Sounds or music into a DC fan?

Perhaps my understanding of how magnets work is off, but would it possible to play some waveforms into the positive and negative leads of a DC fan (think motherboard fan) and get a coherent sound? I ...