Panasonic/Kenmore 3D Inducer Motor

[piano_god]

This motor has been mentioned a few times in recent topics, so I thought I'd create this thread for it specifically...

The "3D Inducer Motor" technically is a single-stage Panasonic motor. However, it sports a redesigned intake and fan which helps to reduce air turbulence by creating a smooth curve for the air to enter the motor. There is a noticeable improvement to the airflow and suction of a machine that is powered by this motor.

To my ear, the noise level seems similar to Panasonic's standard single-stage motors.

Attached are three photos I've taken of a motor I pulled out of my Kenmore. I've also included a link to a motor that's currently on eBay, apparently pulled from a Kenmore 31200 that was parted-out. If someone were to install this motor into another machine, I'd recommend use of melt-blown polypropylene bags exclusively.

http://www.ebay.com/itm/SDS1181DZM-...191260654812?pt=US_Vacuum&hash=item2c8805fcdc

 

[DesertTortoise]

Lamb is doing something roughly similar with their new Advantek series of motors, which use what they call a "tapered fan" design. Lamb is doing this with both one and two stage fans and getting some big air watt numbers this way.

I'm curious why the caution about using only melt blown polypropylene bags?

Is that a brand new motor? Look at the dings on the fan blades. Is that the way they come or did the fan ingest something to damage it? I have seen fans on motors that had been badly abused that didn't look that rough.

 

[DesertTortoise]

Also, if you look at Electrolux fans from as far back as the late 1990s you see they had that technology in production for a good long time before Panasonic and Lamb adopted it.

 

[piano_god]

Tapered fans have been around for decades. All of the motors you've mentioned still force the air into a hard 90° bend prior to entering into the blades.

This particular Panasonic motor allows the air to enter straight into the inlet and immediately flow along the curve of the fan blade, thus creating less resistance.

In regards to the comments on this specific motor, this was taken out of a new machine. The imperfections on the motor blades seem to be manufacturing related, but don't appear to have contributed to any additional vibration and/or noise. As for my recommendation of melt blown polypropylene bags, this is due simply to the increased suction and airflow of this particular motor, thought it's my belief that melt blown polypropylene (HEPA) bags be used on all bagged vacuums.

 

[DesertTortoise]

Piano_god, Lamb makes the same claim for their Advantek II and Advantek Ultra motors. The even refer to them as inducer motors and mention that advanced fan design permits better performance at lower rpms, reducing noise while increasing service life.

 

[piano_god]

While I'm sure the fans on the central vacuum motors you've mentioned are great, the Panasonic is of a physically different design.


 


The Panasonic fan looks like it borrowed some inspiration from the fan used on the Dyson DDM.

 

[DesertTortoise]

Have you seen the fan on a Lamb Advantek II or Advantek Ultra series motor? It's the same concept, very slightly different implementation.

Btw, one of the Advantek series motors is designed as a replacement motor for Kenmore Progressive vacs if you don't want to replace it with a Chinese made motor when it dies. Single stage 5.7 inch fan and 493 air watts, which puts my big old school 115923 motor on the trailer.