Electric motor uses

[john bunsenburner]

At Switzerlands largest annual flee market, yesterday, i brought a really nice, old, but functional electric motor. I got it for 48.55$ or 30.46£ (50CHF). The specs are below(i wrote down all which i could find and don't claim to understand what this means to the most part, also note these are in german. but just in case):

Type AM 71 NY 4
3~Mot.
220/380V(There is a triangle/Y before that)
370W
1370 l/min
50 Hz
VDE 0530/72 Isol.-Kl. B IP 44

There is also a sticker in English and German saying: "Caution- NEW TERMINAL MARKINGS ACCORDING TO DIN 4201 AND IEC 34-8"
The motor is made by AEG



My question is, do you have any suggestions as to what i do with it. I considered a wood lathe, a milling machine or a compressor(normal shop or high pressure?). Do you have any suggestions, or which ones of mine would you choose. Thanks a lot in advance and happy spudding.

[jackssmirkingrevenge]

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[limbeh]

Is it similar to this?

http://cgi.ebay.com/AEG-Model-AM-71-FY6 ... 286.c0.m14

Google says that this is a single phase motor, which is good because then you won't need a 3 phase converter. googling also shows that the uses of the thing have been for fans, afaik.

i suggest u build a wind tunnel. you'd have a special niche in spudfiles as the first in-house wind tunnel testing facility.

i seriously wanted to build one 2 years back, but after getting quotes and adding up the costs it added up to over S$1500 (~750 euros), which i couldn't pay for. and at the same time i discovered spudding......

the fan, motor & inverter cost like S$1000+, but that was probably the biggest fan that wouldn't trip the 13A residential / office power supply.

step by step it would be something like this:

1. get an inverter for the motor. depends on where you are should cost around 100-150 euros.

2. google all those high school constructed wind tunnel (plenty of resources) as well as try to get a basic grip on fluid mechanics. with as your ability that shouldn't be a problem.

3. find some sort of method make the motor belt drive an axial or centrifugal (sp) fan. then get an anemometer and measure the airflow speed that the fan can get you.

4. construct the the tunnel.

i hear that in the west and in europe some schools are willing to sponsor all these kinds of things. if your school does, good for you. furthermore with a bad economy the prices of stuff should decrease a bit....

[john bunsenburner]

I like jsr's idea . I have no acctual use for a wind tunnel. I think a wood lathe may be a good idea. Or perhaps some kind of CNC machine?
I have a good motor, and i want to make something that will acctually be useful to me, that includes new kinds of small arms .

Any more suggestions?

By the way, the motor is about 1/2 HP.

[limbeh]

adding an inverter (aka variable speed drive) is a must for this. no matter whether you want a lathe, CNC, etc, having some sort of way to control the speed for this thing is essential.

gatling spudgun would be cool.....though we'd require ragnerok's expertise and a metal fabrication shop. probably better to do it here in asia, since the fabrication costs are cheaper.

air compressor might be useful, if you plan to go into high pressure.

on the same note i have a bigger motor that one of my friends who finished a project gave to me. i dont have the time to do anything much with it though, other than some of my other friends using it to coil 200m of rope.

[john bunsenburner]

Haha, i love how ONLY Rag. will know...
Any way i have fairly alright basic metal working facilities including a metal lathe and a HUGE drill press. Along with all the basic stuff.

Right now i don't care HOW will make something, i care WHAT i will build...

[john bunsenburner]

No suggestions?

[john bunsenburner]

Well, even though this may not give me new suggestions(though perhaps it will) i have waited to kick this back up before returning from holidays and having access to a camera. I have taken a few pics of the motor next to an AA battery for size comparison. Thanks in advance for your help.

[Technician1002]

The two voltages and the triangle and Y symbols indicate this 3 phase motor has 3 sets of windings. They may be connected in two configurations. In the Y configuration the one end of all 3 windings are tied together and the 3 remaining ends are tied to 3 phase power. This is the higher voltage configuration. The Triangle connection is referred to as a Delta configuration. In this configuration all 3 windings are tied end to end in a triangle. 3 phase power is connected to the 3 pairs of leads. this is the low voltage configuration.

Delta is 220 volt and Y is 380 according to the nameplate. In the connection box, there should be markings for connecting it both ways in the box on some screw terminal strips.

To reverse this motor, simply reverse any 2 of the 3 power leads. It will run either direction.

The 1370 RPM indicates this is an induction motor. If it was a synchronous motor it would be phase locked to the line frequency at 1500 RPM. This is a 6 pole motor. If was a 3 pole motor the synchronous speed would be 3,000 RPM on 50 cycle power.

The cos 0.72 indicates the inductive power factor of the motor. It means that the current is higher than just the wattage of the motor as the current contains an inductive current component. Power factor is a value between 1 and zero which indicate the amount of current that is in phase with the voltage. A 1 is a resistive load. A 0 leading indicats a capacitor current and a 0 lagging indicates an inductive current, but no power drawn. The 0.72 indicates the current is mostly in phase with the voltage under load.

[john bunsenburner]

...

The 1370 RPM indicates this is an induction motor. If it was a synchronous motor it would be phase locked to the line frequency at 1500 RPM. This is a 6 pole motor. If was a 3 pole motor the synchronous speed would be 3,000 RPM on 50 cycle power.

The cos indicates the inductive power factor of the motor. It means that the current is higher than just the wattage of the motor as the current contains an inductive current component.

Wht effects does this have on the use of this motor?

[TwitchTheAussie]

Im going to go out on a whim here for your ideas and say...... Make one hell of a compressor or a giant mini gun. Despite how you do it. It would be pretty cool to see potatos and tennis balls converted to mini gun use.

[Technician1002]

Wht effects does this have on the use of this motor?

It would make a lousy go cart motor as without a very fancy variable voltage variable frequency drive unit, it is single speed. It also requires 3 phase power. The good news is you have 2 choices for voltage. It will make a nice lathe motor, easly reversable.

Most likely under the electrical cover you will find the connections to the winding look like this;



Or this;


Info on connecting the motor is on this page;
http://www.johnson-pump.com/Horticultur ... -motor.htm

U V and W are the 3 windings in the example photos. You can see the 2 ends of each winding is labled. For example winding V has 2 ends, V1 and V2.

[john bunsenburner]

So really when it comes to machines i can make all the basic stuff. I.E. wood lathe for example?

[Technician1002]

So really when it comes to machines i can make all the basic stuff. I.E. wood lathe for example?

Small wood lathe, bench grinder etc. The motor wattage indicates it is somewhere in the 1/3 to 1/2 HP range. There is 745 Watts/HP, not counting power lost to heat.

[john bunsenburner]

How big of a wood lathe can i build? Also what is a reasonable pressure to expect if i make a compressor with a reasonable flow.