Sodick Co., Ltd.

Other

Yoichi Seki

Taro Hasegawa

Akio Hosaka

Sadao Sano

In a linear motor coil assembly ( ), and a method for manufacturing the same, a plurality of coils ( ) are arranged in a line in a direction of movement and have respective coil axes perpendicular to the direction of movement of the motor. A flat cooling tube ( ) is arranged to meander inside the plurality of coils. The cooling tube has a cross section elongated in a direction parallel to the coil axes, and a plurality of clearance holes ( ) through which coolant flows are formed inside the cooling tube. The cooling tube has interleaved folds at least equal in number to the number of coils. The coils being fitted into these folds. At the time of manufacture of the coil assembly, the coils are wound around cores that are divided for each coil, and the cores are inserted into the folds of the cooling tube.

Linear motor coils assembly and manufacturing method thereof

Linear motor coils assembly and method for manufacturing the same

An electric discharge machining apparatus comprises a quill movable in the vertical direction, at least one set of linear motor movers attached to the quill, symmetrically about a center axis of the quill, and a single set of linear motor stators facing the set of movers. An electrode mounting device ( ) for holding a tool electrode ( ) is attached to a lower end of the quill, coaxially with the quill. Preferably, the set of movers includes magnetic plates ( ) attached to the quill and a row of permanent magnets ( ) arranged on the magnetic plates, and the set of stators includes a yoke ( ) and a coil ( ) wound around the yoke. The quill has a hole ( ) in its center extending in the vertical direction, and an air cylinder ( ) providing counter balance for the load of the quill is preferably disposed in this hole. The quill has a density of 4g/cm or less, and is made of, for example, silicon nitride (Si N ) ceramics or a composite material of a light metal and at least 40% by volume of ceramics.

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Fukui, Japan

Yoichi Seki