2) Compute the total electromagnetic torque T, and the rotor speed when the duty

cycle is equal to 0.8 in the following three cases.

a) The separately excited connection in Fig. 2. Consider.

Voc=200V, R₂ = 10, La = 80mH, Lm = 2H,J = 0.005 kgm²,

B₁ = 0.0015 Nm/rad, i, = 1A.

Ra ka

Tue

VDC

Fig. 2. H-bridge drive system for separately excited DC motor

3

b) The shunt excited connection in Fig. 2. Consider:

VDC

Vpc = 200V, R₂ = 10, La = 80mH, Lm = 2H,J = 0.005 kgm², R, = 2000,

L = 20H, B₁ = 0.0015 Nm/rad.

+

Va

4

R₂

Luly

M000

4

R₂

Fig. 2. H-bridge drive system for a shunt DC motor

V₁

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