Current waveform electric motor
Induction motors are designed to avoid reluctance variation according to rotor position. That also avoids reactance variation with rotor position. To avoid reluctance variation, it is necessary to avoid variations in the air gap that would occur if the rotor bar slots in the rotor iron and the stator winding slots in the stator iron are aligned with each other at specific rotor positions. The number or rotor and stator slots must be selected to avoid alignment as much as possible. In addition the rotor slot are configured so that they are not parallel to the shaft, but "skewed" at an angle with the shaft.

With all types of synchronous motors, the rotor is aligned with the rotating stator magnetic field. In that case, the effective reactance is constant because of the nature of than alignment.

Here is a question about skew with answers:

Skew angle in squirrel cage induction motor

The diagram below is from Phillip L. Alger The Nature of Polyphase Induction Machines Copyright, 1951 by General Electric Company. It shows a cross section view of "a typical small induction motor, with a 4-pole, 3-phase 36-slot stator winding." While not discussed in the chapter containing the diagram, the diagram shows that relatively few rotor bars are aligned with stator slots for any given angular rotor position. Also, the stator slots are shaped to maximize the iron path for magnetic flux and minimize the effect of air-gap variations. The copper, aluminum and insulating materials in the air spaces is effectively equivalent to air in the spaces in terms of magnetic permeability, reluctance and reactance.