This work investigates the influence of the pole/slot combination on the elastic wave deformation of permanent magnetic motors. To this aim, the local wave superposition and distributed wave interaction methods are used during investigation. The methods borrow ideas from other fields such as the planetary gears, the turbines, and so on because of the inherent mechanical and magnetic symmetry of the motor. More precisely, the symmetry naturally presents some interesting and useful results without specifying the magnetic pulls/waves or even their magnitudes. The analysis results explicitly show that the elastic wave deformations only depend on whether particular algebraic relations are satisfied by the combination of pole number, slot number, magnetic pull order, and wave number. The predicted relationship and the wave suppression effectiveness are verified by the finite element method and a comparison with an existing literature. The relationship naturally provides simple guidelines for the elastic wave deformation suppression only by using the proper pole/slot combination.