[SOLVED] Electrical Machines EE4003 In-class questions 3 Python

Electrical Machines (EE4003)      In-class questions

Q1 As shown in Fig. Q1, the stator core and the rotor core are two iron cylinders. The iron core length is 10 cm. The average diameter of the airgap D is 10 cm. The airgap between the stator core and the rotor core is 0.1 cm. A coil in the airgap has 10 turns and the coil pitch is 180o. The current in the coil i = sin(2πft) (where the frequency f = 50 Hz). The figure on the right in Fig. Q1 shows the magnetic flux line. Assume that the m.m.f. drop in the stator core and the rotor core can be neglected, and the magnetic flux density between the two sides of the coil in the airgap is uniformly distributed.

i)   Calculate the m.m.f. drop in the airgap.

ii)  Calculate the magnetic flux density B in the airgap.

iii) Calculate the e.m.f. in the coil.

iv) Calculate the self inductance of the coil.

v)  Is the magnetic field in the airgap pulsating or rotating with time?

Fig. Q1