Frequency convertor flameproof

Figure 6.94 Longitudinal section drawing of a flameproof cage induction motor with integrated frequency convertor, stator housing water cooled.

Figure 6.95 Flameproof cage induction motor, with integrated piggyback frequency convertor.

Frequency convertors for motor drives with variable speed have shown reliability and cost reduction for some time. An example for application in coal mines is shown in Fig. 6.104. A frequency convertor with impressed current in the DC link is installed in two separated flameproof enclosures ... 

Rated voltage 1000 V Max. motor rated power 511 kW Cooling water cooled Dimensions Height x width x depth 1000 x 2860 x 800 mm3 Added volume of flameproof compartments 1.5 m3 Weight (total) 3700 kg Type of protection EEx de I. (b) Frequency convertor according to Fig. 6.104(a), doors of flameproof compartments opened. 

Frequency convertors - in the low voltage range - are designed according to flameproof enclosure - d - (Fig. 6.104) or to pressurization - p (Fig. 6.20), combined with e -terminal compartments for the most part. 

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