Linear motor and machine tool having the same mounted thereon

Abstract

The present invention provides a linear motor 1 that can prevent a magnet member 2 from falling down when a power supply is turned off. A linear motor 1 includes a magnet member 2 composed of permanent magnets having alternately arranged respective N poles and S poles and a coil member 3 which surrounds a periphery of the magnet member 2 and trough which the magnet member 2 is movable in an axial direction relative to the coil member 3. A magnetic substance 3 is provided in the vicinity of one end of the coil member 3 to allow the magnet member 2 to exert a magnetic attractive force (Fig.1).

Description

technical field [0001] The present invention relates to a linear motor and a machine tool such as a press machine equipped with the linear motor. Background technique [0002] Conventionally, as a linear motor, it has been proposed to include a magnet member composed of a circular shaft-shaped permanent magnet in which N poles and S poles are alternately arranged, and a member in which a plurality of coils surrounding the magnet member are arranged in the axial direction (for example, Patent Document 1). [0003] The linear motor disclosed in the above-mentioned Patent Document 1 is a device used to replace the combination of a rotary motor and a ball screw in OA machines and the like. The advantages of simplicity and good controllability. [0004] When a linear motor is used in a press machine, for example, when a movable member such as a hammer is stopped at a rising standby position, it is desired that the movable member does not fall even when the power supply of the m...

AI Technical Summary

Problems solved by technology

Springs and air cylinders can be considered as countermeasures against falling, but there are problems of increasing the number of parts and complicating the structure

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