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公开(公告)号：EP0237765B1
公开(公告)日：1991-09-11
申请号：EP87101774.5
申请日：1987-02-09
申请人： HITACHI, LTD.
IPC分类号： G01P3/46
CPC分类号： G01P3/46
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公开(公告)号：EP0184769A3
公开(公告)日：1988-02-17
申请号：EP85115397
申请日：1985-12-04
申请人： HITACHI, LTD.
发明人： Okawa, Tadashi , Tomita, Hiroyuki , Yahara, Masataka , Muramatu, Masaharu , Kobayashi, Sumio , Sugai, Hiroshi , Ninomiya, Hisakazu
IPC分类号： G01D05/36
摘要： A fixed slit plate (4) and a rotary slit plate (5) which is secured to a rotating shaft (6) are provided between two photoconductive elements (2,3) and a light emitting element (1), and the two photoconductive elements (2, 3) provide two outputs (A, A) which have the phase difference π therebetween. These two outputs thus provided are added by adding means (13) to extract the dc component, thereafter exerting feedback control by control means (14) over the light emitting element (1) such that this dc component is maintained at a constant level.
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公开(公告)号：EP0184860B1
公开(公告)日：1990-04-11
申请号：EP85115939.2
申请日：1985-12-13
申请人： HITACHI, LTD.
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公开(公告)号：EP0184860A1
公开(公告)日：1986-06-18
申请号：EP85115939.2
申请日：1985-12-13
申请人： HITACHI, LTD.
发明人： Okawa, Tadashi , Tomita, Hiroyuki , Yahara, Masataka , Muramatsu, Masaharu , Kobayashi, Sumio , Sugai, Hiroshi , Ninomiya, Hisakazu
摘要： For an AC signal representing the rotation information of a rotary machine (30) and having a phase interval of n/3 between phase signals (U, V, W) thereof, the third harmonic contained in the AC signal is derived by producing the difference between two phases of the AC signal or sum (36) (u + v + w) of three phases (U, V, W). The third component is subtracted (34, 35) from respective phase signals (U, V) to produce outputs whereby the third harmonic contained in the rotation information is reduced.
摘要翻译： 对于表示旋转机械（30）的旋转信息并且在相位信号（U，V，W）之间具有π/ 3的相位间隔的AC信号，AC信号中包含的三次谐波通过产生差异 在AC信号的两相之间或三相（U，V，W）的和（36）（u + v + w）之间。 从相应的相位信号（U，V）中减去第三分量（34,35），以产生由此减少包含在旋转信息中的三次谐波的输出。
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公开(公告)号：EP0237765A3
公开(公告)日：1989-07-19
申请号：EP87101774.5
申请日：1987-02-09
申请人： HITACHI, LTD.
IPC分类号： G01P3/46
CPC分类号： G01P3/46
摘要： A signal whose frequency is proportional to a rotational speed of a rotor (110) and whose rising and falling angles near points crossing zero becomes larger with the rotational speed of the rotor is used to produce a first signal (V1) of amplitude corresponding to the rising and falling angles and a second signal (V2) of amplitude corresponding to the frequency, a difference between the first and second signals is evaluated, and the first and second signals (V1, V2) are corrected with the difference.
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公开(公告)号：EP0237765A2
公开(公告)日：1987-09-23
申请号：EP87101774.5
申请日：1987-02-09
申请人： HITACHI, LTD.
IPC分类号： G01P3/46
CPC分类号： G01P3/46
摘要： A signal whose frequency is proportional to a rotational speed of a rotor (110) and whose rising and falling angles near points crossing zero becomes larger with the rotational speed of the rotor is used to produce a first signal (V1) of amplitude corresponding to the rising and falling angles and a second signal (V2) of amplitude corresponding to the frequency, a difference between the first and second signals is evaluated, and the first and second signals (V1, V2) are corrected with the difference.
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公开(公告)号：EP0184769A2
公开(公告)日：1986-06-18
申请号：EP85115397.3
申请日：1985-12-04
申请人： HITACHI, LTD.
发明人： Okawa, Tadashi , Tomita, Hiroyuki , Yahara, Masataka , Muramatu, Masaharu , Kobayashi, Sumio , Sugai, Hiroshi , Ninomiya, Hisakazu
IPC分类号： G01D5/36
摘要： A fixed slit plate (4) and a rotary slit plate (5) which is secured to a rotating shaft (6) are provided between two photoconductive elements (2,3) and a light emitting element (1), and the two photoconductive elements (2, 3) provide two outputs (A, A) which have the phase difference π therebetween. These two outputs thus provided are added by adding means (13) to extract the dc component, thereafter exerting feedback control by control means (14) over the light emitting element (1) such that this dc component is maintained at a constant level.
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