This paper presents variable magnetization pattern machines that have a capability to control the spatial property of magnetization patterns in permanent magnets by intentional dynamic demagnetization during operation. These machines can effectively reduce the unwanted property caused by the spatial harmonic magnetic flux density, such as the iron losses and torque ripple, since they can greatly reduce the source of the harmonics in the rotor magnetomotive force (MMF). The principle of magnetization pattern change, the limitations regarding the applicable machine type, and the machine performance comparison with and without magnetization pattern shaping are discussed.