Sankyo Seiki Mfg. Co., Ltd

Keisuke Abe

Hideki Kanebako

Yohji Okada

The flux densities formed by plural electromagnet poles Mto Mwhich are arranged at a predetermined interval in a circumferential direction of a rotary bodyat the same position in an axial direction of the rotary bodyare gradually changed in the circumferential direction of the rotary body. Even if there is a difference between the maximum value of the flux density and the minimum value, the change of the flux densities between the adjacent electromagnet poles is small and smooth. Accordingly satisfactory detective sensitivity and detection results can be obtained.

Controlled radial magnetic bearing

A rotor includes four magnetic poles provided in a rotational direction at intervals of 90 degrees. A stator includes a winding group for rotation and a winding group for levitation. Each of the winding groups has concentrated windings spaced at intervals of 30 degrees in a rotational direction to provide induction conductive winding sections at twelve locations. Each two of the induction conductive winding sections spaced at an interval of 90 degrees among the twelve induction conductive winding sections are connected to form one winding set such that six winding sets are formed in total in each of the winding groups. Current for rotation and current for levitation are conducted through the six winding sets in the windings for rotation and levitation to perform rotation and levitation controls of the rotor.

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Chiba, Japan

Keisuke Abe