Page 439 - Handbook of Electrical Engineering

428 HANDBOOK OF ELECTRICAL ENGINEERING

Figure 15.12 Instantaneous voltages and currents in an induction motor supplied from a voltage source inverter.

Table 15.5. Peak values of har-
monic current components
Harmonic Peak value and sign
number of the component
current
1 +554.74
5 −110.95
7 −79.25
11 +50.43
13 +42.67
17 −32.63
19 −29.20

From the Worked Example 15.4.3.1 the combined impedance of the rotor and magnetising
branches is Z m2 = 0.00348 + j 0.5362 ohms. Adding the stator impedance gives,

Z 1m2 = 0.00878 + j 0.7711 ohms

◦
All the harmonics of the supply current have either zero or 180 phase shift as seen in Table 15.5.
√
The fifth harmonic supply current I 15 is −110.95/ 2 amps (rms). Inject this current into the circuit.