Class 1 Motor

Title

Class 1 Motor

Brief Introduction

For comparison with the limits of temperature rise ( see Table 8 or Table 9) or of temperature ( see Table 13), when possible , the temperature shall be measured immediately before the machine is shut down at the end of the thermal test , as described in 8.7. When this is not possible , for example , when using the direct measurement of resistance method , see 8.6.2.3.

For machines tested on actual periodic duty ( duty types S3 to S8) the temperature at the end of the test shall be taken as that at the middle of the rise period causing the greatest heating in the last cycle of operation ( but see also 8.7.3).

Three methods of measuring the temperature of windings and other parts are recognized :
resistance method ;
embedded temperature detector ( ETD ) method ;
thermometer method .

Different methods shall not be used as a check upon one another .

The temperature of the windings is determined from the increase of the resistance of the windings . The temperature is determined by means of temperature detectors ( e . g . resistance thermometers , thermocouples or semi - conductor negative coefficient detectors ) built into the machine during construction , at points which are inaccessible after the machine is completed .8.5.4 Thermometer method.

The temperature is determined by thermometers applied to accessible surfaces of the completed machine . The term ' thermometer ' includes not only bulb - thermometers , but also non - embedded thermocouples and resistance thermometers . When bulb - thermometers are used in places where there is a strong varying or moving magnetic field , alcohoi thermometers shall be used in preference to mercury thermometers .

Main Technical Parameters

Application

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