Mitsubishi Denki Kabushiki Kaisha

Aichi Elec Co.

Canon Kabushiki Kaisha

Shigeru Okuma

Toshiaki Ishii

Hiroyuki Ikejima

Takeshi Furuhashi

Mutsuo Tomita

Seiichi Kaneko

Shinji Doki

Mitsuhiko Sato

Kiyoshi Kaneko

Yoshimasa Kimura

Koji Iwata

Yoshihiro Konata

Permanent magnetsare inserted into magnet insert holesformed in a main magnetic poleA of a rotor. An outer circumferential surface of the rotor includes a first outer circumferential surface portionwhich intersects with a d-axis and second outer circumferential surface portionswhich intersect with a q-axis. A radius Rof curvature of the second outer circumferential surface portionsis larger than a radius of curvature of the first outer circumferential surface portions. Recessesare formed in the second outer circumferential surface portionsand in a position to face end wallsof the magnet insert holeswhich are adjacent to the outer circumferential surface of the rotor. It is constructed such that [(74/P)&#xb0;&#x2266;&#x3b8;&#x2266;(86/P)&#xb0;] and [(16/P)&#xb0;&#x2266;&#x3b1;&#x2266;(48/P)&#xb0;], where &#x3b8; is a mechanical angle of the first outer circumferential surface portion, P is the number of pairs of poles of the rotor 50, and &#x3b1; is a mechanical angle of the recesses

Permanent magnet rotating machine

Permanent magnetsare inserted into magnet insert holesformed in a main magnetic poleA of a rotor. An outer circumferential surface of the rotor includes a first outer circumferential surface portionwhich intersects with a d-axis and second outer circumferential surface portionswhich intersect with a q-axis. A radius Rof curvature of the second outer circumferential surface portionsis larger than a radius of curvature of the first outer circumferential surface portions. Recessesare formed in the second outer circumferential surface portionsand in a position to face end wallsof the magnet insert holeswhich are adjacent to the outer circumferential surface of the rotor. It is constructed such that [(74/P)&#xb0;&#x2266;&#x3b8;&#x2266;(86/P)&#xb0;] and [(16/P)&#xb0;&#x2266;&#x3b1;&#x2266;(48/P)&#xb0;], where &#x3b8; is a mechanical angle of the first outer circumferential surface portion, P is the number of pairs of poles of the rotor, and &#x3b1; is a mechanical angle of the recesses

A linear motor elevator includes: a multitude of primary side coils mounted on the hoist way along the whole hoist path, and vertical columns of permanent magnets constituting the secondary side magnets mounted on the elevator car. The polarity of the permanent magnets alternate both horizontally across the columns and vertically along respective columns. When the elevator car is displaced horizontally in a direction perpendicular to the hoisting direction of the elevator car, a circulating current producing a magnetic flux that counterbalances the variation of the flux caused by the displacement flows through each primary side coils opposing the permanent magnets on the elevator car. Thus, the position of the elevator car within the hoist way is automatically adjusted in accordance with the null-flux method.

Linear motor elevator device with a null-flux position adjustment

A linear motor elevator includes permanent magnets 4 mounted on a pair of wing-shaped support members 21 secured on and projecting sideways from the right and the left side walls 3a of the elevator car 3. The polar axes of the permanent magnets 4 are arranged in the direction of the thickness of the support members 21, such that both the north and the south poles of the permanent magnets 4 are exposed on the front and the back surface of the support members 21 and hence are utilized effectively for producing driving force (thrust) for the elevator car 3. Each one of the right and the left side coils 20a and 20b of the primary side coils 20 for forming vertically translating magnetic field is bent at the middle to form two horizontally extending branches, such that the primary side coils 20 sandwich the permanent magnets 4 across predetermined gaps in the direction of polar axes of the permanent magnets 4, when the elevator car 3 passes by the primary side coils 20. Thus, the strong attractive force acting on the permanent magnets 4 from the primary side coils 20 does not act on the cage structure of the elevator car 3.

Linear motor elevator with support wings for mounting secondary side

This specification discloses a driving device having a vibrator adapted to vibrate upon application of an electrical signal thereto, such as a piezo-electric element, and more particularly discloses a driving device in which a drive source having the vibrator is disposed on a base plate and the vibration force of the vibrator is transmitted to a contact surface such as a floor surface and the base plate is driven by the reaction force from the contact surface.

Growing community of inventors

Nagoya, Japan

Shigeru Okuma