－15－
3.5
Fluctuations in the power voltage and frequency
Standard: Rotation electricity machine general rulesIEC60034-1:2004.
It is assumed the one that it is possible to use it by being able to use by continuously
driving the voltage change and the frequency veering in area A in the main rated value
without the obstacle on practical use, and driving the voltage change and the frequency
veering in area B in the main rated value without the obstacle on practical use.
However, operation with "it is convenient and safe is maintained on "practical use, it
means not resulting in the grade which shortens a life remarkably, and the characteristic,
a temperature rise, etc. do not apply correspondingly in the state of rating. Moreover,
main rating shows rated torque (N･m).
Figure5. Change region of the voltage and frequency