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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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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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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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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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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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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
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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
1k views

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
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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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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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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
362 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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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
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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
999 views

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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848 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 ...
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What determines the speed of a brushless DC motor

When driving a brushless DC motor, which parameters control the speed. Is it the current in the windings, the voltage, or both? What determines the maximum speed? If you drive the windings with PWM,...
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Consume less energy by slowing down a 1 HP 220v pool pump motor

I would like to know if and how I could have my pool pump motor consume less energy. It is a 1 HP motor that works on 220v. It is my assumption that if the motor runs slower, then it will consume ...
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AC fan speed control

I use this fan to cool my room, but sometimes it is too fast and I have to frequenctly turn it on and off to keep normal temperature. Maybe it is possible to reduce the speed by connecting a resistor ...
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3answers
2k views

Selecting small motor (wrist watch sized)

I want to build a skydiving altimeter, which is a device with a pointer that looks like and is slightly bigger than a wrist watch. In this device I want to display altitude information using a pointer,...
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1answer
340 views

Circuit for helping big motor to launch

Is there any electric circuit that can help a 2000W Inverter to run a motor with 500W but actually want a big power resource at launch time such as refrigerator? I think if we have a big Capacitor it ...
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7answers
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Torque kgcm (what is kgcm)?

I know what torque is but I find difficult to understand what Torque: 3kgcm means ? I am not sure, how much weight that motor can carry, and I want to know how I can calculate that. Please give me ...
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1answer
5k views

stepper motor current rating

I am having 8 wire stepper motor rated as 12V ,0.95A, and torque=1kg cm it has coil resistance 3 to 4 ohms. I have successfully run this motor with help of this forum. Now i have one doubt regarding ...
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Voltage regulator or resistors to change voltages for motors?

After doing a little research I found out that I can change voltage by either using a voltage regulator chip or resistors. I have a couple different scenarios in which I'll have to drop the voltage ...
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2answers
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How to tell if brushless DC motor is wired delta or Y?

I have a brushless DC motor I'm working with, do not have any spec. sheets for it. How can I determine if it's wired in delta or Y formation? There is nothing on the label that indicates this. Here'...
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330 views

Compact fluorescent lighting and single phase motors

I have about a dozen compact fluorescent light fixtures in a sandwich deli store kitchen area and about a dozen more in the front of the deli. When the vent fans over the griddle are turned on the ...
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1answer
44k views

How to slow down a 220V fan? [duplicate]

Possible Duplicates: what do I need to make 230V AC fan spin slower? 220v AC Fan regulator I have an old fan with a relay made for 4 different speeds. Currently, they are all shorted together, so ...
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2answers
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Which parts of this rotor can be made out of plastic?

I'm asked to redesign a rotor, by making as much parts of it as possible out of plastic. The issue is its weight, we want to make it as light as possible. Especially the shaft & axis of it is the ...
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2answers
931 views

Help identifying a motor and how to control it with an Arduino

I'm experimenting with controlling the transport of an old super-8 film projector via Arduino. My current solution starts/stops the motor by simply switching the projector's pause button via relay, ...
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2answers
217 views

Connecting batteries in series

I have a 90 V motor I'm testing on a bike. I ran it with two Bosch corldess 18 V batteries in series. With 18 volts it ran about 10 miles per hour. With 36 volts (both batteries together) about 20 ...
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Braking with an electric motor

I realize that when you short the terminals of a motor, it stops the motor faster than just turning off the voltage. I was wondering if putting a large diode across the leads so that when the motor ...
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3answers
16k views

Where can I get a small cheap linear actuator?

First, I should clarify: I am not looking for much power or much precision. I am looking for the cheapest thing I can plug into an arduino. I am just looking for stuff I can use for prototyping/proof-...
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1answer
918 views

how to choose the transistor for following case?

I planned to use the following circuit to run unipolar motor. I got this circuit by surfing internet. I know how to choose the transistor for driver circuit by knowing the base current, but in this ...
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2answers
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Arduino - Controlling multiple 12v motors

I have seen this thread but it wasn't helpful. Is it possible to connect four 12v/4a motors to one Arduino and control them independently? I'm a beginner to circuits and such - that's the part that's ...
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1answer
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What electric motor spec clues indicate easy speed control options?

I'm investigating HVAC fans etc to design my own system and controls, and having fully variable speed control is an important consideration to me. I'm pretty sure there are types of AC motors that ...
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how to find out wether the stepper motor is working or not?

I have unipolar stepper motor with 6 wires and i have made controller circuit but when connect controller to stepper motor it is not working.. So i want to know weather stepper motor is working or not....
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How to find out whether I have a unipolar or a bipolar stepper motor?

I have one stepper motor. There are six wires coming out of that. How can I find out weather I have a bipolar or a unipolar stepper motor? Note: Related, but not a duplicate: Unipolar and Bipolar ...
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stepper motor controller

I wish to know how to build a simple stepper motor controller which can run a bipolar stepper motor in forward and reverse direction in desired speed? My project requires only 5 RPM so high speed is ...
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What would be the difference in a coil of wire and just a cylinder of solid copper?

Ok so I am learning about induction and I always see coils of wire with no insulator. So I was wondering, What is the significance of it being a coil of wire rather than just a solid cylinder since ...
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Debugging Vds exceeded in motor drive application

I have an existing motor drive circuit that uses an Allegro 4935 to drive a brushless DC motor. The circuit has been working fine. We've decided to change motors, now with some of the motors the ...
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1answer
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how choose transistor for driver circuit of stepper motor?

I need to drive a 1A stepper motor coil from a digital output that can source only 5mA. That would require Hfe of 1A / 5mA = 200, but I can't find a transistor with that much gain. Is there any ...
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1answer
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stepper motor digital frequency and speed?

In what way the frequency of digital pulse affect the stepper motor funtion. I want know this because i can send digital pulse through my data acquisition card at rate of 100Hz. I want to run bipolar ...
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how to construct stepper motor driver?

I am going to do one project in labview my requirement is to control the stepper motor in following way while pressing one button in front panel the stepper motor should run in one direction in ...
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4answers
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Brushless motor specs to maximize stall torque

I'm interested in a brushless motor having a high stall torque (not much in RPM). What specifications of a BL motor would give a fair indication of its stall torque, provided that voltage is fixed ( ...
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1answer
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Is this a reasonable circuit for locked antiphase PWM?

I'm building a motor controller for a robot that will have a very limited number of IO pins available. I need to drive two motors from only 3 pins, and Locked Antiphase PWM, where the motor is ...
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How and where is energy dissipated in a driven traction motor?

When a fully loaded elevator is moving down its potential energy is decreased and I guess is somehow converted by the elevator traction motor into heat. How exactly does it happen? What exact ...