Patent ID: 9712030
Date: 2017-07-18
CPC Classifications: H02K

Claim:
1. A shaft rotary type linear motor comprising: a hollow movable element having a shaft and an outer cylinder, a plurality of permanent magnets being arranged within the outer cylinder; an armature surrounding the hollow movable element, the armature having a plurality of coils; a frame containing the armature; and a rotatable and linearly movable linear guide supporting the shaft; wherein the outer cylinder contains and covers a first hollow end member, a magnet presser located on a tip side, a plurality of permanent magnets with spacers therebetween, a magnet presser located on a base end side, and a second hollow end member which are all arranged in this order, wherein each of the spacers and permanent magnets has an outer circumference in which a straight groove is formed, and each of the magnet pressers has a straight slit, and wherein airflow is created within the outer cylinder by respective hollow portions of the first and second hollow end members, the respective straight grooves of the spacers and the permanent magnets and the respective straight slits of the magnet pressers.