Kabushiki Kaisha Yaskawa Denki

Takefumi Kabashima

Yuji Arinaga

Koji Uemura

Kazunari Matsuzaki

Yasushi Yoshida

Tomohiro Matsuo

Motomichi Ohto

Ikuma Murokita

Kazutoshi Imai

Ryuichiro Tominaga

Takashi Nagase

Hirotoshi Hayakawa

Tsuyoshi Asanuma

A magnetic encoder unit with a small size and low power consumption is provided which can detect an angle in not more than one-turn and an amount of multi-turn. The magnetic encoder unit includes a permanent magnetmagnetized in a direction perpendicular to a rotation axis of a rotating memberand fixed to the rotating member, a magnetic field detecting elementfixed to a fixed memberso as to be opposite to the permanent magnetwith a gap therebetween, and a signal processing circuitprocessing a signal from the magnetic field detecting element. Here, multi-turn detecting means including a multi-turn magnetic field detecting elementand a multi-turn signal processing circuitdetecting an amount of multi-turn from a signal of the multi-turn magnetic field detecting elementis added thereto.

Small size magnetic encoder unit with low power consumption

Provided is a magnetic encoder device capable of detecting a rotating angle of an actuator having a cavity structure. The magnetic encoder device includes a ring-shaped rotating body, a ring-shaped permanent magnetwhich is inscribed in and fixed to an inner circumferential side of the ring-shaped rotating bodyand magnetized in a direction perpendicular to a center axis of the rotating body, and a fixed bodywhich is disposed on an inner circumferential side of the permanent magnetthrough an air gap and has a circular circumference and a cavity, and a magnetic field detecting elementdisposed on an outer circumferential side of the fixed bodythrough the permanent magnetand the air gap.

Magnetic encoder device and actuator

An encoder signal processing device comprising an A/D converter converting a periodic analog signal, a memory storing position detection error information and a computing unit including a position data calculator which calculates position data from the digital data and an error correcting section which corrects the position data based on the position detection error information. The memory includes a first memory encoding position error data which is included in the position data by the use of the computing unit and storing a correction coefficient. A second memory decoding the position error data on the basis of the correction coefficient by the use of the computing unit and storing correction data for correcting the position data and error-containing position data generated on the basis of the encoded position error data.

Encoding signal processing device and signal processing method therefor

A multirotation type encoder of the invention includes a first encoderattached to a rotating shaftof a rotating machinefor detecting an absolute value rotational angle within one rotation, and a second encoder for counting a multirotation amount of the rotating shaftby using a speed reducing mechanismby magnetic coupling and the second encoderis constituted by a first magnetic geardirectly connected to the rotating shaft and magnetized in multiple poles and at least one second magnetic geararranged to be opposed thereto in noncontact and magnetized in multiple poles by a number of magnetic poles larger than that of the first magnetic gearand is constituted to count a multirotation amount by detecting a rotational angle of the second magnetic gear by the second encoder.

Multirotation type encoder

A magnetic encoder apparatus comprises a permanent magnet fixed to a rotating body , a magnetic field detection element which is opposed to the permanent magnet through an air gap and attached to a fixed body , and a signal processing circuit to process a signal from the magnetic field detection element . The permanent magnet is formed into disk-like, and magnetized in one direction which is perpendicular to the shaft of the rotating body . The magnetic field detection element is arranged on the outer peripheral side of the permanent magnet through an air gap. Further, the fixed body is formed by a ring-like magnetic substance, and an air gap is provided in the circumferential direction, and the magnetic field detection element may be provided in the air gap portion. Accordingly, a magnetic encoder apparatus in which the structure is simple, the resolution is very high, the accuracy is high, and the size is small, can be obtained.

Growing community of inventors

Fukuoka, Japan

Takefumi Kabashima