Very old 2 speed AEG ac motor 4

[G1ZFS]

Gentlemen

I am looking for details on a very old 2 speed AEG ac induction motor I've come across at a customers.

Details:

make: AEG
model number : AM280 MZ 4/2 Y11
power: 72/82 KW 127/137 Amps
speed: 1435/2980 rpm

This motor is very old, and seems to use a star delta type contactor arangement.

Any help appreciated.

Nigel

 

[jbartos]

Suggestion: There are various ways the two speed motor can be designed. The above motor does not have ratings that would fit star-delta reduced voltage starter. Two speed motor function can also be accomplished by switching the winding of two speed motor.

 

[SteveKW]

What more do you need to know?

Here are some diagrams...

http://www.firstelectricmotor.com/motor_connections.htm

http://www.usmotors.com/products/ProFacts/1-105.htm

http://www.ab.com/industrialcontrol...ntactors_starters_overload/pdf/520-wiring.pdf

 

[electricuwe]

There is no useful way to change speed of an induction motor of that rating with a star/delta-configuration !

Try a search on the term "Dahlander-Connection"

 

[G1ZFS]

Thank you very much for your replies gentlemen.

I'm afraid I have a very "electronic" bias, and I'm just trying to help my customer, as the on site engineer is somewhat of a "mate".

The speed change is by "altering" the windings as suggested above, I only listed star/delta as thats the one I see most of that doesnt involve electronic speed control, ( I know star/delta isnt really speed control, just a way of starting).

I will check out the links above.

The on site engineer has gotten the motor working, but was unable to find anyone with any knowledge of this system.

The problem he now has is when changing from the faster speed to the slower speed he gets "objection" from the motor, ( noise, current draw etc), suggesting that he needs a time delay of some kind, so as not to re-apply power until the slow speed has been reached, or dropped below.

Again many thanks gentlemen, I think I'm going to like this site.

Best wishes

Nigel

Arvor engineer

 

[ScottyUK]

Nigel,

From the description of the motor, and with some interpretation of the motor part number, your motor appears to be designed for star connection only but is designed to operate as either a two pole or four-pole machine, thus effecting the change in speed. The relatively constant current for both high and low speed mode indicates that the motor is a constant horsepower type, whether in high or low speed mode.

I'll have a look in the excellent Brook Hansen 'little red book' when I get back to work on Monday. The book has dozens of motor interconnection diagrams and other useful information. It only costs £10 and is available mail-order. It is well worth investing in a copy, particularly if you are playing with motors with incomplete details and are trying to suss them out.

http://www.brookcrompton.com/tech-guides.htm

When changing from high speed back to low speed, the motor is momentarily acting as an induction generator until it drops below the 1500rpm synchronous speed for a 4-pole machine. During this period it will be dumping energy back in to the supply at a high and uncontrolled rate causing the current surge and noise you observed. A short delay will smooth things out by allowing it to coast down naturally prior to energising the low speed winding.




-----------------------------------

Start each new day with a smile.

Get it over with.

 

[aolalde]

Dual speed, Constant Horsepower, 2poles/4poles motors have typically 6 leads and are connected as follows:

High speed ( 2 poles) connect as 1 Delta. Feed motor terminals 6,4&5; L1toT6, L2toT4, L3toT5 leave motor terminals 1,2,3 open.

Low speed ( 4 poles) connect as 2 Wye. Feed motor terminals 1,2&3; L1toT1, L2toT2, L3toT3, terminals 4,5&6 are connected together (neutral)

The phase sequence is very important, if changed the motor will reverse rotation with the speed change and will trip the overcurrent relay.

L1 means power line 1, etc
T1 means motor terminal 1, etc.

 

[jbartos]

Suggestion: Visit

http://www.sea.siemens.com/contrlbu/upld/files/p41-46.pdf

for 2-speed motor-winding connections

 

[ScottyUK]

A footnote to jB's post:

Figure 11 on page 6 looks promising. Just how aolalde described it.


-----------------------------------

Start each new day with a smile.

Get it over with.

 

[G1ZFS]

Thankyou gentlemen.

I will contact the company first thing Monday morning.

I am suprised by, and very pleased with all the help and suggestions.

Scotty, where are you in the UK ?

Best wishes

Nigel

Arvor engineer

 

[ScottyUK]

G1ZFS,

I'm a Geordie living in exile in Teesside, gradually working my way home to God's Country after a spell in the south. Where are you?



-----------------------------------

Start each new day with a smile.

Get it over with.

 

[G1ZFS]

I'm in Worcester, (thats the English one for our American chums).

I'm quite lucky though, get to travel all over, was even in the states before christmas, Lawrenceburgh, near nashville.

Strange place though, they make Jack Daniels there, but you cant drink it !, dry town or something like that.

Best wishes

Nigel

Arvor engineer