Kabushiki Kaisha Yaskawa Denki

Takahisa Yamada

Yasuhiro Miyamoto

Masahiko Tanabe

Toshiyuki Hoshi

Tatsuhiko Koba

Toru Takano

Seigo Nagamatu

A cylindrical linear motor capable of solving the problem that a leak flux links an aluminum frame at both ends of an armature of a conventional cylindrical linear motor, which causes a viscous braking force as a motor brake force, is provided. The cylindrical linear motor armatureincludes a plurality of cylindrical coilsarranged in the axial direction in a cylindrical yokeformed by a magnetic material and framesandcovering the outside of the cylindrical yoke. Only in the axial direction region of the framewhere the cylindrical yokeexists, the frameis formed by an aluminum frame, and the axial direction both end portions are formed by a resin cap

Cylindrical linear motor armature, cylindrical linear motor field pole, and cylindrical linear motor using them

In a moving magnet type linear actuator (), a stator () having an armature () including a magnetic iron core () fixed on a stator base () and an armature winding () wound around the magnetic iron core (); and a movable body () having a field permanent magnet () arranged oppositely to the magnetic iron core () through a magnetic gap and a magnetic holder () supporting the field permanent magnet () and movably arranged on the stator base (), the magnetic holder () is made of a non-magnetic substance, and a magnetic back yoke () is arranged on the side opposite to the armature with respect to the field permanent magnet () to from a gap between the magnetic back yoke () and the field permanent magnet () and is fixed to supporters provided on the stator base (). In accordance with this configuration, there is provided a moving magnet type linear actuator which can reduce the weight of the movable body to improve the accelerating performance and gives no problem about the life of linear guides.

Moving magnet type linear actuator

A linear motor including a plurality of movers (to), each of which is formed with an armature having a polyphase balancing winding (Ru to Rw), and a stator having a permanent magnet or a secondary conductor is configured such that the plurality of movers (to) are disposed on the single stator; and the polyphase balancing windings (Ru to Rw) in the respective movers (to) are connected in series. Accordingly, there can be obtained an inexpensive linear motor which is capable of driving a large machine, which is capable of canceling cogging force, which offers facilitated assembly of movers, and which can provide thermal protection of the movers with ease.

Growing community of inventors

Fukuoka, Japan

Takahisa Yamada