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Machine is regarded as a system composed of multiple components that are related to each other.For example,an interior permanent magnet synchronous motor is a system composed of some components such as a rotor yoke,permanent magnets,a stator yoke and coils.They have positional and electromagnetic relationships.Even if each component is optimized individually,their collection may not be optimum as a mechanical system.Therefore,it is desirable to optimize a component in consideration of the relationships with other components.