Victor Company of Japan, Limited

Naoki Akiyama

Toshio Konno

Masaki Murakami

Susumu Kubo

Kaneo Yamamoto

Norio Matsuda

Shinya Tominaga

Eiichi Kotake

Yasuyuki Mori

Kenichi Kitamura

A tachogenerator has a magnetoresistance film coil formed on a stator surface along a circular path concentric with a rotor axis. The coil has a spatially periodic structure, with multiple spaced-apart lateral components series connected with longitudinal components. The stator surface is opposite to a rotor surface having multiple equiangularly spaced magnetic pole faces with alternately opposite polarities. Current passed through the coil develops voltage variations. Undesirable small voltage variations resulting from manufacturing tolerances are averaged to zero at the coil output terminals.

Tachogenerator having a magnetoresistance stator coil

A coil assembly comprises a plurality of conductive spiral pattern layers which are piled up via (an) insulating layer(s) on a wafer. The electrical connection between the spiral patterns is established by means of a conductive member, which is a portion of the upper spiral pattern layer, filled in a through-hole which is made in the insulating layer so that the spiral patterns are connected in series to develop a high voltage when the coil assembly is moved in a magnetic field.

Coil assembly having stacked spiral pattern layers and method of making

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Yokohama, Japan

Naoki Akiyama