Exercise 2: A 50 hp DC motor is required to drive a centrifuge pump at a speed rating between 15000 and 30000 rpm. Owing

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Exercise 2 A 50 Hp Dc Motor Is Required To Drive A Centrifuge Pump At A Speed Rating Between 15000 And 30000 Rpm Owing 1 (62.77 KiB) Viewed 96 times

Exercise 2: A 50 hp DC motor is required to drive a centrifuge pump at a speed rating between 15000 and 30000 rpm. Owing to commutation problems associated with a standard commutator at these speeds. It is decided to use a commutator less DC motor driven by two converters with a de link (figure:2). converter 1 converter 2 converter 3 3-phase 60 Hz input 1- control gate triggering settings- limit gate triggering external inputs processor processor settings Figure 2 Synchronous motor driven by a converter with a dc link. The output frequency can be considerably greater than 60 Hz, thus permitting high speeds. A 2 pole motor is selected having a nominal rating of 50 hp,30000 rpm,400 V, 65 A. When the motor delivers its rated output. The delay angle for converter 2 is 150 degrees. if the available 50 Hz line voltage is 540 V. The losses of the converters are neglected Calculate the following: a) The triggering frequency applied to the gates of converter 2 b) The module of the DC link voltage |E2| c) The delay angle of converter 1 d) The DC link current if the motor draws an input power of 40 Kw e) The fundamental ripple frequency in El f) The fundamental ripple frequency in E2 g) The power factor of the 50 Hz lines. h) The reactive power absorbed by the converter 1. EL ((ELIED) +4