This, paper examines how changing the magnetic orientation of permanent magnets in concentrated winding interior permanent magnet synchronous motors (IPMSMs) affects their demagnetization resistance. We evaluated a prototype for demagnetization at 180°C that consists of a 130-degree V-shaped rotor core in which parallelogram magnets with oblique orientation are arranged and confirmed by finite element analysis (FEA) where the demagnetization resistance increases as magnetic field orientation angle α becomes larger. We confirmed the coercivity influence at the end of the magnet by evaluating our prototype.