Kabushiki Kaisha Yaskawa Denki

Ryuichirou Tominaga

Masafumi Tamai

Keiichi Tanaka

Yoshiaki Kubota

Michihiko Zenke

Takao Fujii

Fumihiro Tara

Noriaki Iwabuchi

A small and high rigid linear motor (), wherein a tabular heat pipe () is disposed between a plurality of coil rows forming an armature coil () along the longitudinal direction of an armature () with a part of the heat absorbing part of the heat pipe () fixed to the armature coil () and the heat radiating part thereof inserted into a refrigerant passage (), a block-shaped locking member () for fixing the heat pipe () to a frame () is installed between the portion of the heat pipe () for fixing the armature coil thereto and the portion thereof inserted into the refrigerant passage (), and a hollow recessed part () forming the refrigerant passage () and allowing die insertion of the heat radiating part of the heat pipe () therein and a locking step part () allowing the locking of the frame () to the locking member () installed on the heat pipe are provided in the frame (), whereby the heat of the armature coil can be efficiently transferred to the frame, and the thrust of a rotor can be prevented from lowering according to a rise of temperature of the armature coil.

Linear motor

Stage apparatus are disclosed that provide high-accuracy positioning and movements of a stage platform, while generating reduced stray magnetic-field fluctuations and perturbations. The stage apparatus include at least one linear motor having a stator and a moving coil. Each stator includes a yoke that includes linear arrays of permanent magnets relative to which the moving coil, attached to the stage platform, moves inside a linearly extended coil gap in the yoke. A magnetic-shield plate extends around all outer surfaces and edges of the yoke as well adjacent the coil gap. The magnetic-shield plate is made of a magnetic material having high magnetic permeability.

Magnetically shielded linear motors, and stage apparatus comprising same

D.C. reactor

Growing community of inventors

Fukuoka, Japan

Ryuichirou Tominaga