Abstract A rotor (10) is divided into 2 n rotor elements (101, 102, 103, 104) to eliminate n kinds or the component (A, B) of the torque ripple of a synchronous motor. In order to eliminate the first component (A) of the torque ripple, the two rotor elements of each of 2 n-1 rotor element pairs (101, 102; 103, 104) are shifted from each other by an angle corresponding to the half of the wavelength (λ) of the first component. In order to eliminate the second component (B), the 2 n-1 rotor element pairs are divided into 2 n-2 rotor element groups, each of which comprises the two pairs that are shifted from each other by an angle corresponding to the half of the wavelength (γ) of the second component. The shifting is repeated until the n-th torque ripple component is eliminated, thus constructing a rotor.
A structure of a permanent-magnet-included rotor for an electric synchronous motor generating an output torque containing therein "n" kinds of cyclic torque ripples, characterized in that said rotor is divided into 2 n rotor elements having an equal longitudinal length, respectively, these rotor elements being grouped into first through 2 n-1 th pairs of rotor elements, each pair of rotor elements including two rotor elements circumferentially shifted by an angle corresponding to a half of a wavelength of a first of the "n" kinds of torque ripple components, said 2 n-1 pairs of said rotor elements being grouped into first through 2 n-2 th rotor sections, each rotor section including two said rotor-element pairs arranged to be circumferentially shifted by an angle corresponding to a half of a wavelength of a second of said "n" kinds of torque ripple components, and in turn, said rotor elements being finally grouped into two groups of rotor elements, said two groups being arranged to be circumferentially shifted from one another by an angle corresponding to a half of a wavelength of "n"th of the "n" kinds of torque ripple components.
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