Need correct terminology 2

[zlatkodo]

I have a long experience in the three-phase motor repair ( with squirrel cage) and I am writing to the collection of data for rewinding with information about the 8000 different motors.
The collection consists mainly of the tables with all the relevant information for motor (stator dimensions,power, voltage, the number of thread, layers, parallel branches, pitch, wire, the connection, etc.) For all motors there are winding-schematics.
I have the introduction of 2-3 pages that I wrote in my bad English, so I am interested in whether we someone who is familiar with the terminology winding motor, can help the introduction and write grammatically and technically correct?
Introduction is attached. Thank you. Zlatkodo.

 

[7anoter4]

Hi zlatkodo
It seems to me a wonderful idea.
English is not my mother tongue, also. But I think the terminology you used is suitable. What you need indeed, is to improve the sentences and not the vocabulary. For example, the first sentences of "Introduction" have to be as follows [my opinion]:
"In each repair workshop have reported motor problems for several reasons. For instance, it is a case of a single motor overhaul but the factory documentation is mostly unavailable- for a wide range of data, power, speed, voltage, etc.
Therefore, it is necessary to make a careful review of invalid motors. However, even most careful review can not guarantee the correct information. Often it happens that the motor was already unwounded, since during a fault the motor was entirely burnt."
Good luck !

 

[waross]

Most of us are spending time with our families during the holiday season. Expect more help in the New Year.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[TurbineGen]

Zlatkodo,

I'm having a little trouble understanding what it is exactly you are trying to say, but here's my best attempt on paragraphs 2-4.

"Therefore it is necessary to make a careful review of invalid motors. However, even most careful review can not guarantee the correct information. It often happens that the motor was already damaged on rewinding, which may be because of a fault or that the motor is burnt. Also, it is often the case that the winding is so damaged, especially with smaller motors and multi speed motors, that it was impossible to get data.
Therefore after review, a complete electromagnetic calculation should be done. This of course takes a long time and requires a specialist who is able to do it. This work increases costs of repairing and often it is needed to rewind once again with the changed data (usually due to excessive no-load current).
This manual (for about 8000 motors) is designed so that it is possible to reduce problems with the motors on which the details are incorrect. The data is grouped so that it is possible to quickly get to the data for each motor, including those without a nameplate or windings. If the stator core does not have the same dimensions as in the table, this manual contains the methodology for calculating other dimensions."

If my revision describes what you are trying to say, I will continue with the rest of the document. It's been a while since I've had a grammar course, but the above should be acceptable.



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If it is broken, fix it. If it isn't broken, I'll soon fix that.

 

[TurbineGen]

Ok, I tried with the rest of the document. I did not change the term "threads", as I am uncertain whether you meant strands, paths, winds, or something else. My experiences are with brushless DC, but the information in the manual makes sense to me.

Here's the rest:

'
All variations of winding schematics which are processed in the table are attached behind each table.
This manual contains material from various sources: factory documentation, technical literature, and the most important information received in the repair workshops.
All of the data verification was performed with the help of special computer programs, in which they check the most important parameters such as induction in the air gap, in the teeth and core, density currents in the wire, coefficient of filling the slot, no-load current, size of coils , the amount of wire to create a windings, etc...

Tags size and their measures:

? - nominal power of the motor, (kW),
U –nominal line to line voltage at 50 Hz (V),
DV - outer core diameter, (mm)
Di - inner core diameter (mm)
L –core length, (mm)
Z - the number of stator slots
Ø - wire diameter (mm)
N - the number of wires in the thread
W - total number of active threads in the slot
s - the number of layers in the slot
a - the number of parallel branches in one phase, (or number of circuits???)
Lw - length of coil, (mm)
kg - the total weight of wires in the motor (kg)
Rph – resistance of one phase winding, measured with direct current (Ohm)
Io – no load phase current (A)
h - total time for execution overhaul the motor, (h).




Chapter I
Data for single-speed motors
The data are grouped in the following manner: all motors ( about 8000) with the same number of slots (12, 18, 24, etc.) are grouped in the table 1-1 ... 1-14. In each table, the data are located by increasing the internal diameter of a stator and cores with equal diameter, by increasing the length of core ..
Therefore it is possible in case of rewinding of motor with unknown or defective data, to use the data of second motor which has the same inner diameter of stator. If the table does not have such a motor with the same length of stator, it is necessary to take nearest (lengthwise) stator and the number of thread in the slot and adjust it by the inverse of the difference of the length of the cores. The power of the motor is proportional to core length. Of course, we select the same motor speed and the voltage.
When we calculate windings for another voltage, the number of thread in the slot changes in direct proportion with voltage, and the same number of parallel branches in the phase of a cross section of thread (mm2) changes are inversely proportional.
MARKED VOLTAGE IN THE TABLE IS LINE-TO-LINE FOR WYE-CONNECTION.
ALL INFORMATION IS SET FOR 50 Hz.
If you need verification of slot filling, the following condition must be met:
kp = Sw / Su ? 0.4
where is: Sw-total cross-section of wire in the slot, (mm2),
Su - the slot area (mm2 ).
In this way, using tables 1-1 to 1-14, we can get to the needed information in a few minutes. See also:

http://www.youtube.com/watch?v=guPfSCPNiZI"

I hope that helps. It might not be perfect, but it's better.

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If it is broken, fix it. If it isn't broken, I'll soon fix that.

 

[zlatkodo]

Thanks for help.
Zlatkodo