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公开(公告)号：EP0729033A2
公开(公告)日：1996-08-28
申请号：EP96102466.8
申请日：1996-02-19
发明人： Sone, Isamu , Shirakura, Toshiharu , Kawashima, Keizaburo , Hayashida, Hiroshi , Nakagama, Yoshiaki , Shimizu, Makoto
IPC分类号： G01R15/20
CPC分类号： G01R15/246
摘要： An optical current transformer in which an influence of a temperature change in a magneto-optic sensor unit is compensated to conduct measurements with high accuracy by the following structure: Between two polarizers 4 and 5 having mutually different transmission polarized light directions, a Faraday rotator 6 is disposed to form a magneto-optic sensor unit. Light beams from optical transmission units 2 and 2' are inputted to the magneto-optic sensor unit in opposite directions. Two light sources 7 and 7' for emitting the input light beams emit light beams having the same waveform characteristics. Light beams outputted from the magneto-optic sensor unit are converted to electric signals by photoelectric conversion units 8 and 8'. Two light beams traveling through the magneto-optic sensor unit in mutually opposite directions are subjected to intensity modulation by using mutually different frequencies. From the electric signals after photoelectric conversion, intensity-modulated frequency components are selectively extracted. The change of quantity of light caused in two light beams by the Faraday effect is derived by differential computation.
摘要翻译： 通过以下结构，补偿了磁光传感器单元中温度变化的影响进行高精度测量的光电流互感器：在具有相互不同的透射偏振光方向的两个偏振器4和5之间，法拉第转子6 被布置成形成磁光传感器单元。 来自光传输单元2和2'的光束以相反方向输入到磁光传感器单元。 用于发射输入光束的两个光源7和7'发射具有相同波形特性的光束。 从磁光传感器单元输出的光束由光电转换单元8和8'转换成电信号。 以相互相反的方向传播通过磁光传感器单元的两个光束通过使用相互不同的频率进行强度调制。 从光电转换后的电信号，选择性地提取强度调制频率分量。 通过差分计算推导出由法拉第效应引起的两个光束中的光量变化。
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公开(公告)号：EP0146849B1
公开(公告)日：1990-08-16
申请号：EP84114857.0
申请日：1984-12-06
申请人： HITACHI, LTD.
IPC分类号： G05B19/35 , H02K41/035
CPC分类号： G05B19/358 , H02K41/0356 , H02P25/034
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公开(公告)号：EP0288050A3
公开(公告)日：1990-05-16
申请号：EP88106392.9
申请日：1988-04-21
申请人： HITACHI, LTD.
CPC分类号： H02K37/18
摘要： A large number of teeth are formed on the outer circumference of a rotor (1). A stator (2) is disposed around the rotor. The stator has multiple magnetic poles whose number is n times the number of phases. Each pole has formed on its surface a plurality of teeth at a pitch equal to the rotor tooth pitch. The teeth mounted on the adjacent magnetic poles are selected to be one-half or thereabout against to the rotor teeth for making the adjacent poles are to be opposite phases each other.
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公开(公告)号：EP0729033A3
公开(公告)日：1997-07-16
申请号：EP96102466.8
申请日：1996-02-19
发明人： Sone, Isamu , Shirakura, Toshiharu , Kawashima, Keizaburo , Hayashida, Hiroshi , Nakagama, Yoshiaki , Shimizu, Makoto
IPC分类号： G01R15/20
CPC分类号： G01R15/246
摘要： An optical current transformer in which an influence of a temperature change in a magneto-optic sensor unit is compensated to conduct measurements with high accuracy by the following structure: Between two polarizers 4 and 5 having mutually different transmission polarized light directions, a Faraday rotator 6 is disposed to form a magneto-optic sensor unit. Light beams from optical transmission units 2 and 2' are inputted to the magneto-optic sensor unit in opposite directions. Two light sources 7 and 7' for emitting the input light beams emit light beams having the same waveform characteristics. Light beams outputted from the magneto-optic sensor unit are converted to electric signals by photoelectric conversion units 8 and 8'. Two light beams traveling through the magneto-optic sensor unit in mutually opposite directions are subjected to intensity modulation by using mutually different frequencies. From the electric signals after photoelectric conversion, intensity-modulated frequency components are selectively extracted. The change of quantity of light caused in two light beams by the Faraday effect is derived by differential computation.
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公开(公告)号：EP0091684B1
公开(公告)日：1988-08-03
申请号：EP83103495.4
申请日：1983-04-11
申请人： Hitachi, Ltd.
发明人： Hayashida, Hiroshi , Miyashita, Kunio , Takahashi, Tadashi , Morinaga, Shigeki , Ishizaki, Kosho
CPC分类号： G05B19/293 , B41J11/42 , G05B2219/34053 , G05B2219/34215
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公开(公告)号：EP0048983A3
公开(公告)日：1983-08-03
申请号：EP81107686
申请日：1981-09-28
申请人： Hitachi, Ltd.
IPC分类号： G01D05/16 , G01P03/487
CPC分类号： G01D5/145 , G01D5/16 , G01P3/487 , G01P13/045
摘要： The invention discloses a rotation detecting means for detecting the rotation state of a rotating body, in which a magnetic recording medium (4) on which N and S magnetic poles are alternately recorded at a constant interval is fixed symmetrically with respect to a rotary shaft of a rotating body (3) whose rotation state is to be detected, and an MR element (5) comprising magnet-resistive elements [R u, R 12, R 21, R 22 ] is mounted at a fixed position relative to the magnetic recording medium so that the rotation state of the rotating body can be detected from variation of the values of resistance of the magnet-resistive elements caused by the rotation, of the body. N and S poles are recorded on the magnetic recording medium (4) with a small pole pitch P. The magnet-resistive elements (R " , R 12, R " , R22) are formed to have a width sufficiently smaller than the pole pitch. The magnet-resistive elements constitute a first group (R " , R 12 ) and a second group (R 21, R 22 ), the magnet-resistive elements of each group being disposed with an interval equal to the pole pitch or half the pole pitch. The magnet-resistive elements are disposed in such a manner that the interval between the groups is deviated from the pole pitch, whereby a circuit comprising these magnet-resistive elements can detect the rotation of the rotating body.
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公开(公告)号：EP0048983B1
公开(公告)日：1986-05-07
申请号：EP81107686.8
申请日：1981-09-28
申请人： Hitachi, Ltd.
CPC分类号： G01D5/145 , G01D5/16 , G01P3/487 , G01P13/045
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公开(公告)号：EP0146849A2
公开(公告)日：1985-07-03
申请号：EP84114857.0
申请日：1984-12-06
申请人： HITACHI, LTD.
IPC分类号： G05B19/35 , H02K41/035
CPC分类号： G05B19/358 , H02K41/0356 , H02P25/034
摘要： An actuator has a stepping motion function with a high stopping accuracy and resolution. The actuator includes a fixed portion (11) and a movable portion (13) constructed in combination so as to be movable relative to each other, a coil (15) for imparting a moving force to the movable portion, a magnetic recording medium (17) mounted on one of the fixed portion and the movable portion and recording magnetic signals, and a plurality of magnetic sensors (3) mounted on the other thereof for detecting said magnetic signals in said magnetic recording medium, and wherein signals (A, B, C) different in phase and output from said respective sensors are used by themselves, or signals inversely converted from the former signals are additionally used, and the coil is supplied with a torque command by sequentially selecting and changing those signals.
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公开(公告)号：EP0066673A3
公开(公告)日：1984-04-18
申请号：EP82101591
申请日：1982-03-02
申请人： Hitachi, Ltd.
发明人： Miyashita, Kunio , Takahashi, Tadashi , Hayashida, Hiroshi , Morinaga, Shigeki , Ishizaki, Kosho
IPC分类号： G05D13/62
CPC分类号： G05B19/416 , G05B19/237
摘要： A method and apparatus for controlling the angular position of a motor by controlling the revolution of the motor in response to a given positioning command value (9 0 ) commanding a predetermined angular position of the motor shaft so as to stop the motor shaft at the predetermined angular position, wherein the acceleration (a, or a,') of the motor being accelerated in the initial acceleration stage of the motor position control operation is calculated, and, on the basis of the calculated acceleration and a commanded maximum velocity (w 1 ), the remainder angular distance (θ d1 , or θ d2 ) between the deceleration starting angular position and the desired angular position of the motor and the deceleration command value (ω N ) in the deceleration stage are calculated so as to control the deceleration of the motor on the basis of the calculated values.
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公开(公告)号：EP0087812A2
公开(公告)日：1983-09-07
申请号：EP83102025.0
申请日：1983-03-02
申请人： Hitachi, Ltd.
IPC分类号： H02P7/00 , G05D13/62 , G05B19/407
CPC分类号： G05B19/416 , G05B2219/34215 , G05B2219/37388 , G05B2219/41021 , G05B2219/41245 , G05B2219/42237
摘要： A control process for positioning an electric motor (2) provided with a rotation angle detector (4) at a designated position positively at a high speed without being accompanied with hunting notwithstanding variation in the motor current and inertia of a load. The control process activated upon stating of the motor and ending at the stoppage of the motor at the designated position includes a first control region (0-6 4 ) in which acceleration of the motor having been started is detected and subsequently a constant speed operation of the motor is effected at a maximum speed, a deceleration initiating time point (θ 4 ) which is determined in dependence on the acceleration (a,), a second control region (θ 4 -θ 3 ) in which the motor is decelerated in accordance with a deceleration pattern determined in dependence on a rotation angle extending between a position corresponding to the deceleration initiating time point and the commanded stop position, motor torque and inertia of load detected at the deceleration initiating time point, a third control region (6 3 -6 2 ) in which the motor is progressively decelerated by reducing corresponding the gain of voltage (current) applied to the motor when the motor position approaches to the commanded stop position, a fourth control region (θ 2 -θ 1 ) in which when the motor stops short of or beyond the commanded position, the duty of voltage applied to the motor is progressively increased to thereby re-start the motor toward the commanded position, and a fifth control region (θ 1 ) in which the motor is held at the commanded stop position.
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