IE3 Efficiency

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Title

IE3 Efficiency

Brief Introduction

Motors with rated output not exceeding 5 kW , instead of being tied to a specific type of static power converter , may be designed for use with any static power converter , with or without external inductance , provided that the rated form factor for which the motor is designed will not be surpassed and that the insulation level of the motor armature circuit is appropriate for the rated alternating voltage at the input terminais of the static power converter .

In all cases , the undulation of the static power converter output current is assumed to be so low as to result in a current ripple factor not higher than 0,1 at rated conditions .

For a . c . machines rated for use on a power supply of fixed frequency supplied from an a . c . generator ( whether local or via a supply network ), combinations of voltage variation and frequency variation are classified as being either zone A or zone B , In accordance with Figure 11 for generators and synchronous condensers , and Figure 12 for motors .

For d . c . machines , when directly connected to a normally constant d . c . bus , zones A and B apply only to the voltages.
A machine shall be capable of performing its primary function , as specified in Table 4, continuously within zone A , but need not comply fully with its performance at rated voltage and frequency ( see rating point in Figures 11 and 12), and may exhibit some deviations . Temperature rises may be higher than at rated voltage and frequency .

A machine shall be capable of performing its primary function within zone B , but may exhibit greater deviations from its performance at rated voltage and frequency than in zone A . Temperature rises may be higher than at rated voltage and frequency and most likely will be higher than those in zone A . Extended operation at the perimeter of zone B is not recommended .

In practical applications and operating conditions , a machine will sometimes be required to operate outside the perimeter of zone A . Such excursions should be limited in value , duration and frequency of occurrence . Corrective measures should be taken , where practical , within a reasonable time , for example , a reduction in output . Such action may avoid a reduction in machine life from temperature effects .
 

Application

Chemistry                                          Power Station                                    Cement                                         Pump

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