Mitsubishi Denki Kabushiki Kaisha

Yoshikazu Ugai

Yuji Nakahara

Taizo Iwami

Shinji Nishimura

Akihiro Yamamura

Akihiro Daikoku

Keiichi Komurasaki

Katsuhiko Kusumoto

Yukari Toide

Shunichi Futatsuishi

Masaaki Nakano

Kazuo Uesaka

Toyomi Ohshige

Shuichi Takahama

Hidekazu Satake

Naoki Tani

Shiroh Takatani

Kohsuke Haraga

Muneharu Sanoh

Jinichi Furukawa

Yasuo Ozeki

Akiyoshi Kariyama

Radially oriented ring-shaped preliminarily molded pieces of a ring magnet are stacked in an axial direction to form a ring-shaped molded body, in which end faces of the ring-shaped preliminarily molded pieces are bonded together. This ring-shaped molded body is sintered and heat-treated to produce the ring magnet. Ring magnets which are less susceptible to deterioration of magnetic properties due to a disturbance of magnetic orientation near lamination boundary surfaces are produced. The invention provides a method of manufacturing such ring magnets with high efficiency.

Ring magnet and method of manufacturing the magnet

An apparatus for manufacturing a ring-shaped powder compact () includes a ring-shaped die () having magnetic property formed by combining a plurality of arch-shaped members (), a lower core section () placed inside a curved inner surface of the die (), and lower and upper punches () for pressurizing both the die () and magnetic powder filled into a cavity formed between the die () and the lower core section () in an axial direction of the die (). The curved inner surface of the die () varies in cross-sectional shape from one position to next along the axial direction of the die () at least in part along the axial direction. A ring magnet manufacturing method includes filling the magnetic powder into the cavity and producing the ring-shaped powder compact () by pressurizing the magnetic powder in the cavity in the axial direction by means of the lower and upper punches () while applying a radially orienting magnetic field to the magnetic powder, and sintering the ring-shaped powder compact ().

Apparatus for manufacturing ring-shaped powder compact and method of manufacturing sintered ring magnet

This invention relates to a permanent magnet molding apparatus and has as an object an improvement in productivity and reliability thereof. This invention includes a transferable metal die unit () including a die having a cavity of a desired cross-sectional shape in which magnet molding material powder is filled, the cavity extending in groovelike form in a specific direction on a surface of the die, a lid member placed to cover the cavity, and a pair of punches having the same cross-sectional shape as the cavity, the punches being capable of fitting in the cavity from both ends thereof and made slidable in directions in which the punches go into contact with and become separated from the magnet molding material powder, pressurizing means () for holding the metal die unit () which has been transferred with the magnet molding material powder filled in the cavity and for pressurizing the magnet molding material powder by driving the two punches such that the punches slide in their approaching directions, and magnetic field generating means () for magnetizing the pressurized magnet molding material powder while applying a magnetic field thereto in a direction perpendicular to a direction of pressurization.

Permanent magnet molding apparatus

A coil conductor for a dynamoelectric machine which is a coil conductor to be inserted into slots of an iron core of a dynamoelectric machine, the coil conductor being made of a plurality of wire elements compression-bonded to each other by press-forming so as to have a substantially rectangular cross-section. The wire elements may be twisted by at least 360 degrees and the twisted wire elements may be further twisted. The coil conductor includes straight sections and crossover sections, providing an overall shape of a crank wound in a serpentine manner and the straight sections have different intervals that are different in accordance with the different periodical numbers th and ( &plus;1) th. The coil conductor for a dynamoelectric machine may further include an electrical insulating material disposed around the conductor of a square cross-sectional shape that is formed by simultaneously pressing the conductor bundle with an electrical insulating material placed therearound before press-forming.

Coil conductor for dynamoelectric machine

A motor embedded with magnets having good properties and productivity. A rotor of this motor includes a rotor core with laminated rotor core plates punched out of an electromagnetic steel plate and studded with bonded magnets of a powdered permanent magnet material and a resin in groups of slits located in the rotor core for each pole of the rotor.

Motor and motor rotor having embedded permanent magnets

A display element includes a position regulating plate along the side of a condensing lens for positioning the sides of the condensing lens, a filter and an emission element in the same plane so as to prevent any deviation in the position. The display element prevents separation between a condensing lens, a filter and the front panel of an emission element even if thermal stress or other external forces are applied to the display element as well as preventing inclination of the condensing lens when the members are bonded together.

Display element

Growing community of inventors

Tokyo, Japan

Yoshikazu Ugai