ecm moter

[jlt]

 I war killing some time last week and was looking around in an apliance recyling place. and in a barrel found a 1/2 hp ge ecm moter.the guy wanted 10 bucks for it I told him to plug it in and if it works i wii take it . he was looking at all of the wire plugs on the control module on the back of it. A he said well if you want it as is howbout 5 bucks .I got it home and removed the control unit from the back of it.Now only 3 wires coming out of it.put it in my drillpress and at 250rpm the lowest speed puts out 31v.from 1leg, it is a three phaze .moter with 4 perm mags. and 18 coils.lights up a 12v tail lamp bulb pretty bright.from just one leg of it  I will have to find a rectfier for it. and go inside of it and try to find the star connection so that i can bring them out to try a delta connection.I i am hoping it get about 5amps at 200rpm int a 12v battery.This is a fun new toy to play with.

[Nando]

GOOD PRICE !!

I am familiar with 1/2 HP ECM.

It has 4 magnets with double poles .

I have been trying to get the info to send to you but, I can not find it in a bad hard disk.

Hold a bit and tell me what your plans are .

Basically, at 900 RPM rotation will produce 60 HZ 3 phase and has 4 amps capability for a maximum of about 250 watts ( heating limitations).

It is designed for a maximum of about 1000 RPM, though 1300-1400 are OK.

My initial suggestion is NOT to re-connect the windings but leave them as such and use transformers to convert to your desired output voltage.

We have used the ECMs in small Hydro systems.

The star end connection is at the opposed end to where the output wires come out.

I do not remember the winding resistance, but I think that is too big for what you want to do, specially with the low RPM you want to work with.

I found the data

...................V O L TA G E S

RPM....STAR....LEG

380. ...44......25.4
     
480. ...58......33.49
     
720. ...87......50,.23
     
1325. ..160.....92.38
      
      

Star leg resistance 10.4 Ohms

Leg Resistance 5.2 Ohms

Loads 788 and 380 Ohms

Loading done to :

1325 RPM

Open....788.....380 Ohms

160.....155.....149.5 Volts

..0.....0.1967..0.393 amps

..0.....30.49...58.82 Watts

There are other parameters to consider:

Magnetic losses ( gap between rotor and stator)

Resistive + magnetic losses running around 14 - 15 % at 58 watts output.

So this ECM needs to be worked at high RPM 100 to 1300 RPM for good power harvesting

AT 1325 RPM loading 3 phase the current close to 1.2 amps, though a bit more power can be drawn with higher current loading to produce not more than 250 watts.

Nando