Exercices Corrigés Automate Programmable Industriel (API) - Grafcet - Électromécanique des Systèmes Automatisées-ESA-OFPPT-PDF - Électromécanique des systèmes automatisés

lundi 18 mai 2020

Exercices Corrigés Automate Programmable Industriel (API) - Grafcet - Électromécanique des Systèmes Automatisées-ESA-OFPPT-PDF

  Can I Help You       lundi 18 mai 2020

Exercices Corrigés Automate Programmable Industriel (API) - Grafcet Électromécanique des Systèmes Automatisés-ESA-OFPPT-PDF

Exercices Corrigés Automate Programmable Industriel (API) - Grafcet Électromécanique des Systèmes Automatisées-ESA-OFPPT-PDF




Exercices Corrigés Automate Programmable Industriel

 

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Data

 

5. Current reversible chopper:

We consider the circuit opposite intended to connect a voltage source to a

load modeled by a current source.

This current source can deliver a positive or negative current I; the

operation therefore requires the two sources to be reversible in current.

a) Determine, for each sign of I, the nature of the functions (T or D) to

enforce.

b) Deduce the corresponding diagram.

6. Inductive storage chopper:

We consider the chopper opposite in which all the elements are ideal.

E = 50 V; T = 50 µs; α = 0.7; L = 10 mH.

The switch control is periodic and takes place as follows:

* from t = 0 to t = α.T K is closed and K 'open;

* from t = α.T to t = T K 'is closed and K open.

We suppose the steady state established and we note Im the value of the intensity

in the coil at the start of a period.

a) Express, by two independent relations involving on the one hand E and on the other hand E ', the intensity IM during

blocking K.

b) Deduce a relation between E, α and E '. Calculate E '.

c) The average power exchanged between the two sources is P = 70 W. Determine Im and IM.

d) We want to define which switching functions can be used.

Plot the evolution of the intensity in the coil and in each switch with the numerical values.

represent in the voltage-current plane the operating zones of each switch K and K '.

Deduce the switching functions to be used.

Answers: b) E ’= αE / (1-α); c) Im = 1.9 A; IM = 2.1 A; d) K = Tr, K ’= D.

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