Identify this motor?

[janaf]

I have this motor that I need to identify. It is not a servo motor but I could not find a better section here at CNCZ

There is no plate on it. I was giving it an overhaul and thought I'd find some info then, but there was hardly any at all. What I know:

- It is most likely 380V, 3-phase D-connected
- It is an asynchrone 2-winding / 3000 rpm @50Hz motor
- It has (shorted) rotor windings, not PM:s
- It is of a low profile, small diameter, long rotor type, frequently used in sawmill spindles and circular saws.
- This particular one has a flange for mounting a circular saw blade, straight onto the shaft
- It is about 120mm think on the "flat" side, the house ex shaft is about 300mm long
- Other motors this size and type typically have 1.5-2.2kW output
- There is text in German on the connector plate and on a plastic part, but no brand name or model name.

CEG E63S are similar motors but far from identical.

Any clues of brand or model?

[Al_The_Man]

It appears to me to be a high rpm type, I have seen these ran off a rotary frequency convertor and used in router or as you mention saw applications.
The diameter and length of the rotor would definitely point to this.
The modern way would be by VFD.
Al.

[janaf]

I will run it via a VFD but it would be nice to know some ratings like maximum power / current. Can I figure something out by measuring winding inductance and resistance? It's permanently D-coupled so I can not measure windings one by one.

Otherwise, I'll just stick a temperature sensor an keep an eye on it.

[Al_The_Man]

Job to see the physical size as nothing in the pic to relate it to but I would put it at least 2hp.
No real positive way using non-powered measurements.
Al.

[janaf]

Some more pics.

House is 120x120mm cross section plus heat sink fins on two sides
Length 270mm without shaft, without fan
Shaft diameter 25mm in the front end, 20mm back end
Rotor diameter 60mm

[Al_The_Man]

That looks like it puts it in the 2hp-3hp category?
Al.

[Larken]

I think its an old Perske saw motor. Made in Germany.

[janaf]

Perfect! Yes, looking in their catalogue, everything fits with the Perske KNS 61, even the weight!

It's rated 2.5kW 50Hz, 3kW at 60Hs, 4kW at 100Hz, and seems to be usable all the way up to 300Hz / 7kW.

Many thanks Larken!

[Larken]

Its has a flat profile since the circular blade is mounted right on the shaft. This allows more blade above the table.

When you run it from an inverter set the base frequency to 300 Hz so you don't burn it out.

[janaf]

I will have monitoring and auto-shutdown on both current and temperature just in case....