# scorrimento del motore

## English translation: motor slip (pu)

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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
 Italian term or phrase: scorrimento del motore English translation: motor slip (pu) Entered by:

 15:17 Jan 18, 2008
Italian to English translations [PRO]
Tech/Engineering - Electronics / Elect Eng
 Italian term or phrase: scorrimento del motore Below is an extract from a specification for an electricity generator. I found the word "slip" in the ProZ term search but it doesn't sound right to me (a non-engineer!). Any help appreciated. Nel seguito sono elencati i significati delle grandezze utilizzate nelle suddette formule per la determinazione dei carichi improvvisi dovuti all’avviamento dei motori: Pm = Potenza meccanica nominale del motore (kW) Cm = Coppia massima di avviamento del motore (pu) Um = Tensione ai morsetti del motore all’avviamento (pu) sm = Scorrimento del motore alla coppia massima (pu) ηm = Rendimento nominale del motore (pu)
 Chris PottUnited Kingdom Local time: 23:27
 motor slip (pu) Explanation:Slip is definitely right for electric motors. Pu = per unit Slip Depends on Motor Parameters According to the formal definition, the slip (s) of an induction motor is: , where ns = synchronous speed n = actual speed For small values of motor slip, the slip (s) is proportional to the rotor resistance, stator voltage frequency, and load torque -- and is in inverse proportion to the second power of supply voltage. The traditional way to control the speed of a wound rotor induction motor is to increase the slip by adding resistance in the rotor circuit. The slip of low-horsepower motors is higher than those of high-horsepower motors because of higher rotor winding resistance in smaller motors. Smaller motors and lower-speed motors typically have higher relative slip. However, high-slip, large motors and low-slip, small motors also are available. You can see that full-load slip varies from less than one percent (in high-HP motors) to more than five percent (in fractional-HP motors). These variations may cause load-sharing problems when motors of different sizes are mechanically connected. At low load, the sharing is about correct, but at full load, the motor with lower slip takes a higher share of the load than the motor with higher slip.
Selected response from:

Jean Martin
Local time: 23:27
 Thanks to you all4 KudoZ points were awarded for this answer

5 +2motor slip (pu)
 Jean Martin
5engine runningLyudmila Gorbunova (married Zanella)

56 mins   confidence:
engine running

Explanation:
engine running

 Lyudmila Gorbunova (married Zanella)ItalyLocal time: 00:27Specializes in fieldNative speaker of: RussianPRO pts in category: 8

1 hr   confidence: peer agreement (net): +2
motor slip (pu)

Explanation:
Slip is definitely right for electric motors.

Pu = per unit

Slip Depends on Motor Parameters
According to the formal definition, the slip (s) of an induction motor is:

, where

ns = synchronous speed

n = actual speed

For small values of motor slip, the slip (s) is proportional to the rotor resistance, stator voltage frequency, and load torque -- and is in inverse proportion to the second power of supply voltage. The traditional way to control the speed of a wound rotor induction motor is to increase the slip by adding resistance in the rotor circuit. The slip of low-horsepower motors is higher than those of high-horsepower motors because of higher rotor winding resistance in smaller motors.

Smaller motors and lower-speed motors typically have higher relative slip. However, high-slip, large motors and low-slip, small motors also are available.

You can see that full-load slip varies from less than one percent (in high-HP motors) to more than five percent (in fractional-HP motors). These variations may cause load-sharing problems when motors of different sizes are mechanically connected. At low load, the sharing is about correct, but at full load, the motor with lower slip takes a higher share of the load than the motor with higher slip.

 Jean MartinLocal time: 23:27Works in fieldNative speaker of: EnglishPRO pts in category: 155
 Thanks to you all

agree
 46 mins

agree
 1 hr

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