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Questions tagged [fan]

A device that produces air movement by way of blades or surfaces attached to a rotating motor.

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1answer
22 views

12V Pump not working

I have interfaced a 12 V pump and a 12 V fan to LPC2138, there are 3 5 V sensors interfaced, according to which the fan and pump function. The whole setup is in PCB. There is a ESP8266 module ...
0
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1answer
44 views

Cooling fan analysis [closed]

Current value specification is 0.75+_10% for brushless DC motor.but my bldc motor draws 0.6amps as running current.what effect will occur if draws lower current as o.6amps instead of 0.675amps ...
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2answers
60 views

Powering 5 fans with a LTC 3780 : should I protect it against induction effect?

I want to power 5 fans in parallel (12V 0.80A, each) using a adjustable power supply (DIY, made with an LTC 3780 connected to a 24V 15A PSU and mini Voltmetre). I read that a fan could destroy the ...
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1answer
40 views

PWM fan with PWM wire disconnected [closed]

What will happen when the supply and ground are connected for a CPU fan with PWM but the PWM wire is not connected? Will the fan run at its full speed?
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1answer
33 views

USB internal control to on/off a pc fan molex circuit

I am new to electronic circuits so I might not have the correct nomenclature for some items. Description: I have 3 high power 12V PC fans (NON PWM) connected to a hub that draw power from MOLEX ...
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1answer
48 views

Will it harm a PWM fan controller to be backfed full fan voltage?

I want to install a PWM controller to a small 12 volt furnace fan in a camper. I want the fan to run slowly after furnace shutdown, to quietly stir the air for more even heating. My thought is to ...
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1answer
36 views

Help understanding amperage of DC motor and heat generation

I am diagnosing an issue in an automotive HVAC system and have been testing the blower motor. I would expect somewhere approximately 8A to 15A of current draw. I have test wired the motor with 14AWG ...
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1answer
36 views

How can I check the voltage of a fan?

Is there a way I can connect 1 or 2 batteries to a CPU Fan that I dissasembled to check what voltage it is so I can use it at the highest speed?
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1answer
40 views

Trouble to find out the nominal motor current and motor type of a fan from its datasheet

Is there a way to find out what is the nominal current of this fan and what type of single phase induction motor is used?
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1answer
43 views

How to power a dc fan (4wire) [closed]

I have intel dc 12v cpu fan (removed from a computer) that has 4 wires (Black Yellow Green Blue) (Model E97379) [Photo- http://www.filetolink.com/c50ea25682 ] I want to power it by ac to dc 12v ...
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1answer
54 views

What kind of fan connector is this?

I need to change fans of my beamer but I cant find a replacement because I dont know which connector they used. Thought it would be an 3 Pin connector but it isnt. The connector in the pictures is ...
0
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1answer
37 views

Thermoelectric Cooler sensor

My team and I are testing our Peltier Thermo-Electric Cooler Module+Heatsink Assembly - 12V 5A from Adafruit. We are using an external power source and sensors to get readings for the current, voltage,...
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0answers
50 views

Air conditioner fan not starting

I have a problem with my air conditioner fan not starting. As seen from the schematic below, when I test for voltage between the brown and black wires, I get 0 V (this is the problem). The indoor unit ...
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2answers
53 views

How to choose the correct pc fan? [closed]

I need to replace a pc-fan 2 pin(80X80X25mm). The only details it has are:12V/0.14A.(no RPM/CFM details). Will those details(voltage/current)enough and i can pick any 80X80X25mm 2-pin pc fan which has ...
2
votes
1answer
188 views

12V PWM controller for 12V fan that gets faster with the COLD

I need a controller for a 12 V - 1A fan, blowing on the cold side of a Peltier element to keep it at constant temperature. I have the hot side under control. I have seen multiple cheap PWM ready-to-...
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0answers
57 views

Repair or reuse 4-wire pwm pc fan that I broke by swapping GND with 12v

It is a 4-wire PC PWM Fan that I broke by swapping the GND and 12v for 2-3s. I did it because I thought it could reverse the direction like in other motors. So, something is dead in the fan. I remove ...
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3answers
96 views

Why does a car cabin fan need a big resistor?

The blower motor resistor for the cabin fan in a Volvo 850/V70 is so big that it is not even part of the motor. It has its own mounting. Here is a picture: Why does the blower require such a large ...
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0answers
89 views

Ceiling fan speed controller question

I need to connect 15 ceiling fans. Each bay has 3 ceiling fans that will run of the same speed controller, so 5 controllers in total. They will be wired from a separate circuit from the DB box. Here's ...
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0answers
37 views

What if voltage is decreased for an electrical fan (DC Motor)

Will the speed of rotation decrease or increase? I have an idea of Lorentz Force and all that. Use P=VI and V=IR to explain this to me please. I can't understand what will be the outcome of decreasing/...
0
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1answer
122 views

What type of motor is this? (photo included)

I want to make this motor work, but I can't understand what type this is. I supplied 5V DC to the terminals, but it just kept buzzing and the coils were energized. It also had some kind of circuit, ...
1
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2answers
63 views

Can I use a pc case fan for a tumble dryer? [closed]

My tumble dryer is broken. I found the service manual online and according to the error number the heat pump fan is the problem. I open it up and to my surprise I found a standard sized case fan in ...
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0answers
24 views

Potentiometer Selection for Fan Speed Control [duplicate]

I am making a stir plate out of an old PC fan, variable resistor, and DC power supply from this tutorial. I have two power supply's to choose from, their outputs are: PS1 = 12Vdc, 2A PS2 = 12Vdc, ...
2
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2answers
101 views

What is the best/safest way to wire a 200V fan in the USA, using 120v or 240v? [closed]

I bought a surplus fan/HEPA filter unit for using in a clean room. The wiring diagram is here. I want to connect it to a power cord and plug it into the wall. I know basic electric, but I'm not sure ...
0
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0answers
34 views

Is it possible to electronically control the physical speed switch on air movers?

I have a few consumer level air movers (Xpower) that have a 3 speed physical switch. Is there a way I could replace the physical switch with something that would interface with a microcontroller to ...
1
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0answers
809 views

4-pin PC Fan PWM control and speed monitoring

I want to control and monitor the speed of a 4-pin PC fan using an esp8266. When there is no PWM control signal sent to the fan from the esp this code reports the fan speed correctly. However, ...
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votes
1answer
258 views

Is it safe to power a PC fan (12V 0.30A) with an adjustable power adapter (3 -12V 2A) for an extended period? (8 hrs/day, 365 days/year) [duplicate]

I bought a DIY air purifying kit that uses a PC fan to pull air through a HEPA filter. A blade broke and so the fan needs to be replaced. I want to buy a better quality fan, for example from Noctua. ...
0
votes
1answer
62 views

Control a fan motor (with PWM IC burned out) [closed]

After the IC fan controller burned out by a voltage error I pulled it out to see what the motor coils were like. They are so I think: 4 series coils, but I'm not sure if it's the 4 coils in series. ...
0
votes
1answer
60 views

Should I use constant current or constant voltage drivers for driving my PWM 24V DC Fans?

Hi everyone thanks for stopping by to lend your thoughts. I need to run 2 circuits separately and control via Arduino uno PWM. One circuit is 2x Noctua NF-A14 industrialPPC-24V-3000 Q100 IP67 with ...
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3answers
189 views

How to make a fan speed regulator with a pot and a voltage regulator?

I want to make a simple fan speed regulator, but my electronic skills are failing me. I want to be able to slow down two computer fans. I have in my hands a 12V/1A power suply, 2x 12V/0.2A fans, a ...
0
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2answers
114 views

Can a button control a 5 speed fan without a microcontroller?

Is it possible to control a fan with a single button that cycles though fan speeds without using a micro controller. Can anyone point me to some documentation on how this would work or any ideas how ...
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0answers
31 views

How will the ceiling fan behave if I put unequal turns on different slots of same coil?

Recently I opened a ceiling fan in my home trying to understand its basic operating principle.While i was through it a few questions popped up in my mind, which are as follows:- 1.What will happen if ...
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0answers
24 views

Can I control a Sanyo Denki fan to operate with uniform noise?

I bought this replacement Sanyo Denki fan for my air purifier. The sound out of that fan is louder than the other two pre-installed fans. The original fans mfg is out of business, and replacement ...
2
votes
1answer
63 views

What type is this fan motor and how best can I control its speed?

This is from an old Westinghouse fan and I am not clear on this motor type and how to best control its speed.
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1answer
384 views

Which wire is the positive and which the negative on this fan? [duplicate]

Here is link with the picture of the fan: The fan name is "ZALMAN ZM-F3(SF) 120MM ULTRA QUIET FAN" I looked it up online, but I don't understand, I'm colourblind and it's difficult to distinguish ...
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1answer
109 views

Running a 12V PWM Water pump on a 5V fan output with tacho input

So on my 3D printer from Prusa they use 5V fans and monitor the fans by the tacho signal. I want to replace the hotend with a water cooled version and still want to have the safety feature to turn ...
3
votes
1answer
91 views

If wind rotates my fan, will it cause electrical problems?

I'm planning on building a DIY dryer booster, using this cheapo 220V inline fan: I plan to connect it to a temperature switch and a fuse, and connect it to the exhaust of my dryer. (I'm doing this ...
0
votes
1answer
180 views

How to drive 4-pin fan

I've been attempting to get this 4-pin brushless dc pc fan working for some time now. It has a red (+) black (-) blue (PWM in) and yellow (tachometer out). I only want this fan running at maximum ...
55
votes
3answers
8k views

Fan speed switch: why OFF :: HIGH :: MED :: LOW?

Many AC fans, including inexpensive floor models, have a rotary speed control which rotates from OFF to HIGH to MED to LOW. Since the switch does not rotate 360°, you have to rotate it backwards to ...
5
votes
3answers
1k views

How is air conditioner room unit fan motor controlled?

I have a custom project where I need to control fan speed with Raspberry Pi according to data it gets from various sensors. At first I need to know what my motor needs. For fans I use old air ...
5
votes
3answers
953 views

Can PWM affect a brushless DC fan given sufficient time?

tl;dr - Is driving brushless DC fans using PWM unhealthy for the fan compared to variable but steady DC voltage? If yes, why and how? The super simple ...
0
votes
3answers
517 views

Can I use 1N4148 diodes instead of a 1N4001 diode for reducing the speed of a 5V 1.8W fan?

Looking at this 1N4148 datasheet, it seems that the forward continuous current is 0.3A, thus 300 mA. So if I add two in series, I will get 600 mA. I want to use diodes to reduce a 5V 1.8W fan speed. ...
2
votes
3answers
377 views

What is the technical name for fan that produces electricity?

I'm wanting to create a wind powered LED similar to this one, but weather proof. I know there's tons of them out there, but I'm wanting to build it from scratch. My issue is that I'm completely ...
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votes
1answer
172 views

4-Pin Fan with PWM dc motor controller(not a fan control unit) [closed]

Can I use a DC PWM module (not a fan control unit) for a 4-pin fan (directly to 12v and GND)? something like this module wiring will be motor+ to red and motor- to black. does this method shorten the ...
0
votes
1answer
86 views

What kind of connector is this, where can I get one, and how do I attach it?

I have to replace a fan in an older (circa 2010) NAS storage device, and I found a replacement but the wires don't terminate in a connector (see first image below): The old connector looks like this: ...
2
votes
2answers
442 views

Ceiling Fan Speed Control stripped down

I am a novice but know enough to get by. I was given an older Hunter Fan that is only operated via Remote. I have cut the receiver out because I do not have the remote and from what I have read they ...
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0answers
76 views

What fan could I use to extract hot air from an oven?

I am making an reflow oven. I've decided to use the picoReflow to do the job and monitor it. The oven is originally a lab oven, and it doesn't cool quickly at all. It has a vent at the top which I'd ...
2
votes
1answer
784 views

how does ceiling fan remote implement reverse function?

Most ceiling fans come with a remote control transmitter/receiver pair. The transmitter is hand-held or wall-mounted, and the receiver is installed in the ceiling box. Input to the receiver is a 2-...
0
votes
0answers
78 views

Control 12V Circuit with 3.3V Gpio

I have a fan with its own power-supply running at 12V, with 0.11A / 1.32W. The fan is capable (tested) of running at 5V with lower speed also, and has 3 pins, the third (I suppose for fanspeed-...
0
votes
3answers
2k views

Running 12V PC Fan with 9V Battery

i got an old PC fan which according to its label runs at 12V drawing 0.14Amps. I would like to run this with a 9V Battery so that it doesnt go too fast. Does this make sense? How long would the fan ...
0
votes
1answer
163 views

Bypass button press on fan for direct power on when plugged in

I have a fan that I want to plug into a thermostatically controlled power outlet so that the fan comes on when the temperature reading reaches a certain set point. The fan is currently wired through ...