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what's inside that radiator fan motor

 
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  • 6 Post By RickinPA
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Old 27 Jul 2019, 07:49 pm
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Default what's inside that radiator fan motor

The donor motor is actually from an '04 Neon, but should be representative of PT radiator fan motors.

The fan had stopped working, that's why it was replaced. It looks like the original, 2004 with 120k miles, connector was broken.



Manufacturer is Denso, Made in Japan.



There's some cooling vents on the front, behind the fan blade hub. The output shaft has a ball bearing.



Prying the rear cover of exposes a number of stamped brass conductors to route the power into the motor. The rear bearing is a bronze or Oilite sleeve. Overall, very nice construction.



Removing the brush holder exposes the rotor windings. It's a permanent magnet commutated type motor. There's some nicely executed electrical noise suppression components, a capacitor across the input and two chokes, one on each leg of the input. There's two sets of brushes which seem to be wired in parallel, I suspect for increased running torque.

When I took it apart a LOT of black dust (like toner) came out, at least a tablespoon full, the remains of the brushes. I was surprised it wasn't a brushless type motor. But I guess with the power required and costs involved, they went with a brute force design. My take-away is that radiator fan motors have a finite lifetime due to the motor being a brush type. Of course, it depends on the actual hours of fan operation. It would be nice if the car computer tracked that somehow and gave warning when a fan was due to hit the end of its life.
Attached Images
File Type: jpg face of motor.jpg (86.0 KB, 49 views)
File Type: jpg rear of motor.jpg (78.7 KB, 46 views)
File Type: jpg motor inside.jpg (94.9 KB, 46 views)
File Type: jpg motor inside brushes.jpg (84.3 KB, 47 views)
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Old 28 Jul 2019, 06:51 am
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Default Re: what's inside that radiator fan motor

Nice pics! Thanks for sharing. And you're right about any motor with brushes having a finite live. I've got a Skil circular saw that I've put 2 sets of brushes in over the past 30 years. And only ONE bearing!
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Old 28 Jul 2019, 01:54 pm
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Default Re: what's inside that radiator fan motor

Ditto the thanks!
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Old 03 Aug 2019, 08:09 pm
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Default Re: what's inside that radiator fan motor

Does the Neon have a two speed fan?
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Old 03 Aug 2019, 08:19 pm
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Default Re: what's inside that radiator fan motor

Quote:
Originally Posted by RCSnyder View Post
Does the Neon have a two speed fan?
It seems like most Neons have a single fan, I'm not sure if they're multi speed. This Neon has two fans, side by side. They seem to both be single speed and seem to work in tandem (both on at the same time).
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