Any motor experts here??

The quietest motors I have seen are the EBM Papst. Pricey too!

http://www.ebmpapst.com/en/

You can download the catalog. You'll need to be sure to pick the correct motor type to replace yours. If you post the part number I might be able to help?

There is a guy that is selling replacement motors for Harman stoves on ebay. They're made by merkle-korff and are supposed to be very quiet, made to very close tolerances. Not sure if they are more quiet than the Gleason-Avery motors but I'm really tempted to try one. My brand new Harman Advance is much louder than my 8 year old Quadra Fire stove. The auger in my old Quadra Fire was nearly silent, you actually had to be standing right near the stove to hear it. With my new Harman stove, you can hear it from across the room.

allFIREDup said:

I can't find this guy selling merkle-korff exhaust-combustion motors on ebay??

Click to expand...

This is a guy on e-bay that helped me out. Call or E-mail him with specifics and he will contact you if he can/cannot help.

Jason Munson 530-409-5051 [email protected]

A few things that one needs to think about with these fans.

The combustion fan blade runs in a Hellish environment with hot gasses going through that leave deposits behind on the blades.

Over time the blades will throw off some of the crud and in doing so, leave the blade somewhat out of ballance.

The blades are light weight so the ballance issue is not a huge thing, but any vibration can lead to NOISE.

Another thing is the use of Triac speed controllers.

The use of the triac to control fan speeds is universal across all stove manufactures.

The triac is a great electronic solution to handling motor speed, but comes with one Caviat.

Many times depending on how good the triac is, there can slight variations in the wave form on either side of the line (the triac controls speed by chopping off little bits of the power wave form on either side of the 0 line or the cycle)


Any variations in the postition and timing of the wave segments can cause a harmonic to set up in the motors stator.

This noise is basically harmless to the motor (unless the wave is way out of whack) BUTTTTTTT the noise can be very anoying.

It can manifest as a WHINE or a buzzing sound, depending on the motor.

Some stoves run the exhaust fan at full line voltage and others vary the speed depending on the fuel feed setting.

If the motor is running at full speed with zero modifcations to the power, most motors will run quiet.

Most if not all motors that are having their speed controlled via a Triac will have "critical speeds" at which they will make noise.

My Whitfield advantage 2 had one spot in the speed range of the exhaust fan that was quite anoying.

When I rewired the stove and installed the new controls I used a seperate triac speed controller for the exhaust fan, then set it to a "sweet spot" where it was quiet and the draft through the fire pot was also good.

I just leave the thing set there in the sweet spot. Same goes for the room air fans, I used a seperate triac to run the room air fans and set them to a nice spot that provides adequate airflow though the heat exchangers for the heat range I use.

sometimes just a slight speed change can make the motor go from a very smooth quiet operation to a very noisy whining little witch.

There is nothing more anoying than a motor thats doing the WA WA WA WA WA thing.


Good luck with your quest to get a quiet motor.

Keep us posted

Snowy

Harman has alternatively used the merckle and gleason motors in the past...have dealt with both, and dont really see much of a difference, sound-wise. In fact, the same brand and model of motor can vary widely soundwise.....some are just louder than others. There may be aftermarket brands that are compatible through other vendors, but like mentioned above, make sure they are compatible, especially the rpms of the output shaft.