Download PDF by S.K. Pillai: A First Course on Electrical Drives

By S.K. Pillai

ISBN-10: 047021399X

ISBN-13: 9780470213995

This advent to electric drives offers with points of either DC and AC vehicles, the dynamics of the force process, inherent regular kingdom features of DC and AC vehicles, and the types of equipment used to switch those features to fit particular requisites. the writer discusses crucial temporary strategies: beginning and braking and varied tools used to estimate the ranking of vehicles subjected to varied load cycles. One bankruptcy is dedicated to the more and more renowned thyristor managed force. Solved and unsolved difficulties are supplied to demonstrate the innovations awarded.

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Extra resources for A First Course on Electrical Drives

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The line drawn through these points is termed the pinch-off limit. P,. 12. The MOSFET has very high input impedance, and this causes problems of handling MOSFETs since any stray or static voltage present will destroy the channel ; protection circuits are normally included to protect the transistor. -------1 1----. drain + , . . - - - -...... - - - -... 12 Cross-section through a MOSFET, (a) n-channel enhancement type (normally off), (b) n-channel depletion type (normally on) The operation of the MOSFET is very different from that of the JUGFET, since the channel section is not inserted into the transistor during manufacture ; it is created below the oxide layer and the gate due to capacitor action .

12 Cross-section through a MOSFET, (a) n-channel enhancement type (normally off), (b) n-channel depletion type (normally on) The operation of the MOSFET is very different from that of the JUGFET, since the channel section is not inserted into the transistor during manufacture ; it is created below the oxide layer and the gate due to capacitor action . When the gate goes positive with respect to the source (also connected to the substrate), electrons in the substrate are attracted to the holes repelled from the oxide interface by polarisation, thereby creating an n-type layer called an inversion layer under the dielectric between source and drain .

Unipolar transistors rely on the flow of just one type of carrier, namely electrons or holes . Field-effect transistors (FETs) belong to this second family along with unijunction transistors , although the unijunction transistor is not an amplifying type of transistor; it is used merely as a switch in a similar way to the thyristor. There are many circuit applications where npn or pnp transistors are best suited; in a similar way there are many applications where FETs are best suited. ------;::::~11;::::==:~~1===:=Ff-----' I depletion !

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A First Course on Electrical Drives by S.K. Pillai


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