Sanyo Denki Co., Ltd.

Yoshi Ishizuka

Akira Shimizu

Daigo Kuraishi

Yutaka Nishimiya

Tomoharu Sekine

Shoji Ito

Kazuhiro Makiuchi

Yoshihiro Shoji

Tooru Miyajima

Toru Miyajima

To realize an encoder having highly reliable detection accuracy and capable of reducing a device cost. A light detection unit of an encoder receives light irradiated by a light source and transmitted through light-transmitting portions of Gray code optical patterns of a rotating disk and a light-transmitting/shielding member, and detects the light as digital data. A magnetic detection unit detects a magnetic pattern of a magnet provided on a rotation center portion of the rotating disk as digital data. A processing unit compares the digital data of the magnetic detection unit and the digital data of the light detection unit, and corrects a detection error.

Encoder

An optical encoder device is provided, in which the number of light transmissive slits of a stationary slit plate can be increased as much as possible according to the length of a light receiving surface of a light receiving element to produce an output signal with little distortion. A movable slit plateincludes a slit row Rin which a plurality of light transmissive slits (light transmissive portions) Seach having a slit width of 180&#xb0; in terms of electrical angle and a plurality of light non-transmissive slits (light non-transmissive portions) Seach having a slit width of 180&#xb0; in terms of electrical angle are alternately formed. A stationary slit plateincludes a slit row Rin which a plurality of light transmissive slits Seach having a slit width of 180&#xb0; in terms of electrical angle and a plurality of light non-transmissive slits Seach having a slit width of (360Xk-180)&#xb0; in terms of electrical angle are alternately formed. k is a value that satisfies k=1&#xb1;(&#x2153;) where n denotes the number of the light transmissive slits S

Optical encoder device comprising a moveable slit plate and a stationary slit plate

Motor with encoder

A resolver detected position compensation system for a resolver is provided that can enhance a position detection precision by performing a further compensation on a compensated position that was obtained from a static error compensation. The position detection circuit outputs a compensated detected position signal in which a static error has been compensated. The differential circuit differentiates the compensated detected position signal to obtain a rotational speed of the resolver. Based on a signal representing the rotational speed output from the differential circuit, the phase data memory device and the peak value memory device send the variation in phase and the amplitude peak value, respectively, of the dynamic error signal to the multiplication device. The multiplication device calculates an estimated dynamic error and the subtraction circuit removes the estimated dynamic error from the compensated detected position signal.

Compensation method of resolver detected position

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Nagano, Japan

Yoshi Ishizuka