An electrical actuator converting electrical energy into rotational motion.
2
votes
4answers
226 views
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 ...
1
vote
2answers
1k views
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 ...
5
votes
5answers
1k views
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 ...
3
votes
2answers
1k views
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 ...
3
votes
3answers
403 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 ...
1
vote
0answers
61 views
External Accessories for VFD
I am trying to decide what external accessories I need for my VFD 7.5 HP for a 1500Watt Vibrator motor. The three options I have come up with are below. I'm using a standard 220VAC line supply from ...
0
votes
1answer
118 views
power adaptor vs usb charging - energy efficiency? [closed]
does charging devices like phones etc via power adapters use more electricity i.e. less energy efficient than charging them from USB lead via your PC? many thanks
-2
votes
1answer
445 views
charge a mobile using a dynamo
I am making a project to charge a cell phone battery using a dynamo,but i don't know how to start about.also let me know about the power ratings of the dynamo to be used for charging a 3.7V,1000mA ...
0
votes
1answer
174 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 ...
1
vote
3answers
3k views
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 ...
0
votes
1answer
276 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 ...
0
votes
1answer
2k views
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 ...
1
vote
1answer
525 views
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. ...
0
votes
3answers
140 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 ...
0
votes
1answer
3k 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 ...
3
votes
2answers
189 views
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 ...
3
votes
1answer
297 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, ...
2
votes
2answers
134 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 ...
6
votes
3answers
461 views
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 is ...
2
votes
3answers
2k 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 ...
0
votes
1answer
333 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 ...
0
votes
2answers
2k views
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 ...
1
vote
1answer
621 views
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 ...
0
votes
3answers
677 views
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 ...
3
votes
2answers
1k views
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 ...
-6
votes
4answers
1k views
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 ...
1
vote
1answer
90 views
What motor driver should I use based on amps?
I am building a robot that sports 2 motors ripped from an old RC car. After many attempts to find the data sheets, nothing of use turned up. So, I ran some test and found this out about the motors.
...
6
votes
3answers
392 views
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 ...
0
votes
1answer
63 views
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 ...
2
votes
1answer
1k views
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 ...
0
votes
1answer
361 views
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 ...
2
votes
2answers
594 views
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 ...
5
votes
3answers
681 views
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 ...
1
vote
1answer
312 views
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 ...
1
vote
2answers
116 views
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 ...
3
votes
2answers
239 views
why electric motor or alternator have stack of plates?
i have noticed that all of the transformer/motor/alternator/electric actuator have a stack of metal for stator ( or where winding is done. ). why is that needed ? can same thing not achieve by using a ...
0
votes
2answers
246 views
Brushless Motor Encoder Read?
I have this a MegaMo SY3056 BLDC Spec.PDF
And beside the cables that are connected to the ESC i have thses encoder cables:
How can i read this encoder? and what values do i get?
Can i know the ...
1
vote
1answer
129 views
Circuitry for Running Many Small Motors
I'm creating a simple vibration mat for a child which will be triggered by a force sensor. I'm not trying to do anything complex (like changing frequency of vibration) - simply an on/off circuit. What ...
1
vote
0answers
207 views
Problem with stepper motor and thrust bearing [closed]
I built a small electronic turntable with the following components:
1- Arduino
2- Sparkfun easy stepper driver
3- Stepper motor
4- Servocity set screw hub.
5- Thrust bearing from mcmaster-carr ...
4
votes
3answers
1k views
basic arduino question - do I need a 555 timer?
I have an Arduino (duemilanove) connected to a floppy disk drive and I can happily control the stepper motor using three pins on the ribbon cable to three digital pins of my Arduino (well 2 + the ...
8
votes
3answers
484 views
shooting object by using a DC motor
This is not directly electrical, but I am working on making a real life version of a coin block from Mario. Basically I use an LDR and to detect if someone punches the block and then use a transistor ...
2
votes
1answer
1k views
What power motor should be used to power a Segway-like device
I am planning on building a personal transportation device which will either be a skateboard with a motor etc or a Segway-like device.
I will have two wheels and must be capable of getting me to move ...
1
vote
2answers
260 views
Backdriven stepper motor “powering” rest of the board
I have a stepper motor powered by a breakout board that uses the A4983 stepper motor driver (http://www.sparkfun.com/products/10735).
Sometimes when the power is disconnected and the drive wheels are ...
0
votes
1answer
644 views
how do i drive the h bridge to control a motor?
I am using the ZXMHC3F381N8 MOSFET H-Bridge to drive a motor forwards and backwards. I am using a PIC16F1946. The H bridge is connected to PORTE of the PIC. This is the code I am using to set up the ...
5
votes
2answers
4k views
What is the purpose of carbon brushes in an electric motor
I just took apart our washing machine to replace the carbon brushes.
Was wondering why the machine stopped working when the brushes were worn down?
Also if the engine makes a wuring noise after you ...
8
votes
2answers
2k views
Why connect capacitors to motor body?
So I've found a motor circuit which looks like this:
Since many users here believe that my hand-drawn circuit schematics are in fact pictures of flying spaghetti monster, I'll also provide a ...
5
votes
3answers
3k views
When should I fire the TRIAC's gate when controlling an inductive load (AC motor)?
I'm using a combination of opto-triac + TRIAC to control a 230V AC motor with a microcontroller. For detecting the zero-crossing of the voltage I'm using another optocoupler.
I know that the AC ...
1
vote
2answers
656 views
Controlling multiple motor drivers with one Arduino
I have one Arduino and I need to be able to control five to seven 12V motors that each draw about 4 amps.
Would I be able to use four Sabertooth 2X5 Regenerative Motor Drivers for this? Each driver ...
-1
votes
3answers
1k views
Control hacked servo motor speed using L293D and PWM
I've got a L293D and I've got a PIC16F877A outputting PWM. It's not real PWM, just using Timer0 to turn on a pin for 2ms and off for 18ms, bringing a total of 20ms period.
I got VSS, VC, CHIP 1 ...
3
votes
2answers
3k views
What is back-emf: counter-electromotive force?
Could someone knowledgeable on the subject explain what exactly is this back emf? How is it caused in a motor/generator, which components and which effects determines it?
Thanks
