Fanuc Corporation

Tsuyoshi Furuya

Takashi Okamoto

Akira Yamaguchi

Katsuhiko Imabori

An electric motor having a rotor structure and a production method thereof, wherein a strain due to temperature change does not occur and a manufacturing problem does not occur. Each permanent magnet does not contact each other, and a deformable intervening member is positioned between the end surfaces of the magnets. Intervening member is an elastically or plastically deformable member, and the thickness of the intervening member in the direction of the rotation axis of the rotor is determined so that the neighboring permanent magnets, which are bonded to a rotor core within a manufacturing temperature range of the rotor, do not contact each other at a lower limit of an operating temperature of the electric motor.

Electric motor having rotor structure for avoiding defect due to strain generated by temperature change, and production method thereof

At least one cavity is formed extending along the axis of rotation of a rotor. One or more elastic members are fitted into the cavity to balance the rotor. Once the elastic members are inserted in the cavity, they apply their own elasticity to the inner wall of the cavity, so that they are stably held in the cavity.

Electric motor and manufacturing method therefor

An electric motor capable of securing sufficient degree of freedom in selecting a direction of approaching and connecting electric cables to internal cables of the electric motor. A cable introducing member is in the form of a hollow rectangular prism having four side walls and a through hole formed on one of the side walls. The cable introducing member is detachably mounted on a base member fixed on a body of the electric motor by screws to have one of four orientations angularly displaced by 90&deg; so that the through hole is positioned in conformity with the approach direction of the electric cables. The position of the through hole can be changed by detaching the cable introducing member from the base member and remounting the member to have a different orientation. A terminal rest is provided on the base for connection of the electric cables with the internal cables. The terminal rest has upper terminals to which the electric cables are connected and lower terminals to which the internal cables are connected. The terminal rest may receive the electric cables from two opposite directions in conformity with the position of the through hole. The cable introducing member may have a octagonal cross section or an annular cross section to further increase degree of freedom of orientations of the cable introducing member.

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Yamanashi, Japan

Tsuyoshi Furuya