Moving magnet type linear motor for automatic door
AssigneeToyota Shatai Kabushiki Kaisha
InventorsShigeru Sakagami, Yoshiaki Nagasawa
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Abstract
In a moving magnet type linear motor for automatic door of the invention, a stator fixed inside a guide rail having a substantially .andgate.-shaped cross section and a moving unit having a substantially U-shaped cross section are combined so that a height of the linear motor can be the same as that of the guide rail and the moving unit is supported slidably relative to the guide rail and fixing members of the stator has at least the both longitudinal ends or the stroke ends formed of non-magnetic conductive materials in order that the moving magnet type linear motor for automatic door produces only a low sound and is durable.
Claims11
A moving magnet type linear motor useful for operating an automatic door, comprising:
- a guide rail having an interior and an open end;
- a stator having a plurality of coils arranged in a longitudinal direction within the interior of the guide rail, said stator having fixing members which substantially surround and fix the coils within the interior of the guide rail;
- a moving unit including a yoke, said moving unit including permanent magnets positioned on mutually facing inner sides of the yoke to form a magnetic circuit and said stator being positioned between the permanent magnets;
- a support assembly for slidably supporting the moving unit relative to the guide rail so that the moving unit is able to move longitudinally with respect to the stator and longitudinally along the guide rail between oppositely positioned stroke ends, said fixing members being formed of non-magnetic material adjacent at least one of the stroke ends of the guide rail to thereby produce a braking force for reducing shock when the moving unit stops at said at least one stroke end.
Dependencies are inferred from the claim text.