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  #1  
Old 04-25-2015, 10:29 PM
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PWM blower motor control

Duncan, this should be right up you alley.........

I'm doing some planning on an upcoming EATC mod and the system I'm using is from an Expedition/Navigator. These use a PWM unit for the blower and it, along with the blower motor, is located inside the cabin, on the passenger side on the right and above their right foot and next to the cowl. On the PWM unit are three for four cooling fins and they make up one side one side of the unit. No fan forced cooling, just convection.

I'm running into available space problems if I try to use this same location but I do believe this can be resolved by mounting the unit inside the dash behind the center panel. There's space for air movement in there, it's not stuffed with electronics. So now comes concern #1, heat. Currently my blower circuit is 40A on #10 wire and I expect the PWM unit will use the same, plus more wire ( on more #10 wire, that's on the table for now). So, do these PWM units generate a whole lot of heat?

*I could run a bench test, but I just don't happen to have a suitable power supply to do so.

EDIT: If needed, I can take a pic and post.
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Useful Ford Vehicle Resources:

Owners Manuals >>> http://www.fleet.ford.com/partsandse...owner-manuals/
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Repair guides, includes schematics w/connector pinouts >>> http://www.autozone.com/repairinfo/r...nfoLanding.jsp

Last edited by CowboyBilly9Mile; 04-25-2015 at 10:37 PM.
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  #2  
Old 04-25-2015, 10:42 PM
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Typically they create minimal heat...as compared to a triac/SCR or other type of chopper circuit...depends on the duty cycle and load.

For the most part (in my experience) the MOSFET's need to be kept cool as from what I can remember from my EET schooling, they are a positive temp coefficient...so as temp increases, resistance increases which will result in lower currents passed...a nice circle with a load.

An easy way, without going through a bunch of calculations having to know loads/duty cycles etc. would be to get an inexpensive 12v brushless fan and use a thermodisc on the heatsink.....thermodisks are pretty reliable and avoid the BS of a relay/thermistor circuit.
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Old 04-25-2015, 10:46 PM
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Pardon my ignorance, but what is a PWM? Enquiring minds want to know.
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Old 04-25-2015, 10:48 PM
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Pardon my ignorance, but what is a PWM? Enquiring minds want to know.
Pulse Width Modulation

Think VFD Doug
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Old 04-25-2015, 10:49 PM
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Pulse Width Modulation

Think VFD Doug
Thank you. I understand VFD.
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Old 04-25-2015, 10:57 PM
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Originally Posted by DNFXDLI View Post
Typically they create minimal heat...as compared to a triac/SCR or other type of chopper circuit...depends on the duty cycle and load.
That's was about my expectation since it's really just a "rapid firing" switch.

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For the most part (in my experience) the MOSFET's need to be kept cool as from what I can remember from my EET schooling, they are a positive temp coefficient...so as temp increases, resistance increases which will result in lower currents passed...a nice circle with a load.
Hmm......cool is sort of a relative term as I have no idea what environment temp range the unit was designed for. But honestly, even with a black dash parked in the sun on a hot day, after a period of driving with AC on, it's just gotta be "sort of" steady state in there at, say, 75 - 85*F. At least, I'd like to think so....

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An easy way, without going through a bunch of calculations having to know loads/duty cycles etc. would be to get an inexpensive 12v brushless fan and use a thermodisc on the heatsink.....thermodisks are pretty reliable and avoid the BS of a relay/thermistor circuit.
Calcs? I'm not really sure how to run any numbers on the thing. Lost me on the rest. In the vehicle, the EATC unit will control fan speed automatically, unless the driver over rides that.
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-Life is far too short to be serious all the time. So if you can't stop and laugh at yourself along the way, give me a call and I'll do it for you.

04 Ranger Fx4 Level II, 5R55E, Sonic Blue Pearl, loaded.


Useful Ford Vehicle Resources:

Owners Manuals >>> http://www.fleet.ford.com/partsandse...owner-manuals/
Build Information (click on "vehicle") >>> https://www.etis.ford.com/
Wiring schematics and TSB's (click on "technical information") >>> http://bbbind.com/
Repair guides, includes schematics w/connector pinouts >>> http://www.autozone.com/repairinfo/r...nfoLanding.jsp
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Old 04-25-2015, 11:06 PM
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Calculations that will figure out load/heat dissipation....and what I was referring to was to simply mount a thermodisk to the exposed heatsink that would turn on a fan once a set temperature was reached...100F would work as an example

http://www.mouser.com/Search/Refine....d=therm-o-disc

Controlling a small fan..

https://www.parts-express.com/imc-mi...-008a--259-147
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Old 04-25-2015, 11:12 PM
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Hmmmm.........A fan crossed my mind earlier but I so badly want to just use a "canned" solution rather than have to engineer one. I honestly just have to wonder how significant the airflow is in the upper foot area of the dash area VS inside a dash itself.

*I have learned why Explorers didn't use the PWM unit for the blower on their EATC systems, lol! Which BTW, using those components is an option, but I really don't want to use that EATC head unit. It has one function on the panel that is great for an SUV, but lame for a pickup. That is...."Rear Fan".
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-Life is far too short to be serious all the time. So if you can't stop and laugh at yourself along the way, give me a call and I'll do it for you.

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Useful Ford Vehicle Resources:

Owners Manuals >>> http://www.fleet.ford.com/partsandse...owner-manuals/
Build Information (click on "vehicle") >>> https://www.etis.ford.com/
Wiring schematics and TSB's (click on "technical information") >>> http://bbbind.com/
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  #9  
Old 04-26-2015, 10:06 AM
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Sorry Bill, I didn't realize you just wanted straight plug and play...I don't know what to tell you without knowing the load, rating of pwm etc.
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Old 04-26-2015, 11:27 AM
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I've got the plug and play unit, it's a cooling concern based on location.
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-Life is far too short to be serious all the time. So if you can't stop and laugh at yourself along the way, give me a call and I'll do it for you.

04 Ranger Fx4 Level II, 5R55E, Sonic Blue Pearl, loaded.


Useful Ford Vehicle Resources:

Owners Manuals >>> http://www.fleet.ford.com/partsandse...owner-manuals/
Build Information (click on "vehicle") >>> https://www.etis.ford.com/
Wiring schematics and TSB's (click on "technical information") >>> http://bbbind.com/
Repair guides, includes schematics w/connector pinouts >>> http://www.autozone.com/repairinfo/r...nfoLanding.jsp
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