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This paper analyzes the radial electromagnetic force of induction motors by using two-dimensional nonlinear finite-element method considering the rotor current coupled with voltage equations. First, we analyze the steady-state characteristics of two induction motors to verify our finite-element model. Using this model, we analyze the radial force at the teeth and slots to clarify the influence of slip and the stator winding and the difference between the line source and a pulsewidth modulation inverter. Finally, we discuss the relationship with a measured vibration velocity.