Kabushiki Kaisha Yaskawa Denki

Tatsuhiko Koba

Yasuhiro Miyamoto

Yoshiji Hiraga

Junji Hirai

Hiroyuki Hamamoto

Kenji Hirose

Takahisa Yamada

Keiji Yanagi

Hideaki Wakao

Yoshio Aoyama

In a linear motor, one of a field system and an armature is configured as a mover and the other is configured as a stator. The field system relatively moves with respect to the armature. The field system includes two yoke boards which are arranged facing each other, a yoke base to which one side ends of the two yoke boards are to be fixed, a plurality of permanent magnets respectively fixed to facing surfaces of the two yoke boards and arranged along a moving direction of the mover, and an elastic member configured to apply force the facing surfaces of the two yoke boards in directions that other side ends of the two yoke boards move away from each other.

Linear motor

In some embodiments, a moving magnet type linear slider capable of eliminating a magnet suction force caused by a linear motor to minimize the linear guide friction is provided. The field of the linear motor includes magnet track having a horizontally arranged generally U-shaped magnetic yoke and plural pairs of field permanent magnets arranged on inner opposed surfaces of the magnetic yoke with polarities arranged alternately in a longitudinal direction of the magnetic yoke, each pair of the filed permanent magnets being arranged with opposite polarities faced with each other. The armature of the linear motor includes an armature holder mounted on the side portion of the fixed base in a vertically extended manner, and a planar coreless armature holder horizontally held by the armature holder. The stroke direction length Lof the magnet track is set to be longer than the stroke direction length Lof the armature. Furthermore, a gravity compensation spring for compensating the weight of the movable unit is provided at the bottom portion of the magnet track so as to face the fixed base.

Moving magnet type linear slider

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

Hydraulic source and hydraulic machine

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Kitakyushu, Japan

Tatsuhiko Koba