Seiko Epson Corporation

Shiojiri Kogyo Kabushiki Kaisha

Yojiro Okakura

Kesatoshi Takeuchi

Mamoru Sugimoto

Keshatoshi Takeuchi

Noriaki Shimura

Masaru Kubota

Osamu Takashi

Imao Hiraga

A pressure detection device includes a buffer member and a sensor assembly. The buffer member is deformable by a pressure change, and includes a plurality of magnets in an evenly dispersed arrangement. The sensor assembly includes at least one magnetic sensor to detect a variation of a magnetic field accompanied by deformation of the buffer member.

Pressure detection device and pressure detection method

The brushless electric machine includes a first drive member (U) having a plurality of permanent magnets (U); a second drive member () having a plurality of electromagnetic coils and capable of movement relative to the first drive member (U); and a third drive member (L) disposed at the opposite side from the first drive member (U) with the second drive member () therebetween. The second drive member () has magnetic sensors (A,B) for detecting the relative position of the first and second drive members. The third drive member (L) has at locations facing the permanent magnets of the first drive member (U) a plurality of magnetic field strengthening members (L) for strengthening the magnetic field at the location of the second drive member () in conjunction with the permanent magnets.

Brushless electric machine

The pressure detection device includes a buffer member deformable by a pressure change, including one or more magnets, and a sensor assembly including one or more magnetic sensors to detect a variation of a magnetic field accompanied by deformation of the buffer member.

The brushless electric machine includes a first drive member (U) having a plurality of permanent magnets (U); a second drive member () having a plurality of electromagnetic coils and capable of movement relative to the first drive member (U); and a third drive member (L) disposed at the opposite side from the first drive member (U) with the second drive member () therebetween, and having a fixed relative positional relationship with respect to the first drive member (U). The second drive member () has magnetic sensors (A,B) for detecting relative position of the first and second drive members; and a control circuit for carrying out control of the brushless electric machine utilizing the output signals of the magnetic sensors. The third drive member (L) has at locations facing the permanent magnets of the first drive member (U) a plurality of magnetic field strengthening members (L) for strengthening the magnetic field at the location of the second drive member () in conjunction with the permanent magnets.

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Suwa, Japan

Yojiro Okakura