Variable magnetization pattern machines (VMPMs) capable of dynamic changes in the magnetization pattern and magnitude are discussed in this paper. These machines can behave like brushless DC machines if they have a uniform magnetization pattern. If the magnetization pattern on the permanent magnet is shaped to be sinusoidal through a controlled demagnetizing process, they could behave like brushless AC machines. This paper presents the fundamental principles and the design methods of VMPMs. The design methods including parametric analysis and the overall results are evaluated using finite element analysis (FEA).