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1.发明授权Remote field flaw sensor including an energizing coil, first and second receiving coil groups oriented perpendicular and a third receiving coil oriented parallel to pipe 失效远场缺陷传感器包括激励线圈，垂直定向的第一和第二接收线圈组以及平行于管道定向的第三接收线圈
公开(公告)号：US5623203A
公开(公告)日：1997-04-22
申请号：US506759
申请日：1995-07-26
申请人： Yasuharu Hosohara , Yoshikazu Chiba , Akira Kinoshita , Masanori Akita , Takashi Sumi , Toshihide Kawabe
发明人： Yasuharu Hosohara , Yoshikazu Chiba , Akira Kinoshita , Masanori Akita , Takashi Sumi , Toshihide Kawabe
CPC分类号： G01N27/902
摘要： A flaw sensor for a metal pipe has an exciting coil for generating remote field eddy currents in the pipe. First and second groups of receiving coils are spaced from the exciting coil by respective distances along the axis of the pipe in a region of the generated remote field eddy currents. The first and second groups have respective pluralities of receiving coils with axes perpendicular to the pipe axis and disposed circumferentially about the pipe axis at predetermined angular increments wherein the receiving coils of the second group are staggered relative to the receiving coils of the first group. A third receiving coil is disposed coaxially with the pipe at still another distance from the exciting coil along the pipe axis but also in the region of the generated remote field eddy currents. When a defect in the thickness of the metal pipe is encountered, a magnetic field caused by the defect to be perpendicular to the axis of the pipe is detected by one or more of the receiving coils of the first and/or second group. The third receiving coil detects phase changes to the magnetic field generated parallel to the pipe by the eddy currents. A ratio of phase changes produced by a standard thickness of a reference pipe and a sample subject pipe is used as a correction factor for detected phase changes in a defective pipe to accurately calculate the defective wall thickness.
摘要翻译： 用于金属管的缺陷传感器具有用于在管道中产生远场场涡流的励磁线圈。 第一组和第二组接收线圈在所产生的远场涡流的区域中沿着管的轴线与励磁线圈隔开相应的距离。 第一组和第二组具有各自的多个接收线圈，其轴线垂直于管轴线并以预定的角度增量围绕管轴线周向设置，其中第二组的接收线圈相对于第一组的接收线圈交错。 第三接收线圈在与激励线圈沿着管轴线更远的距离处与管道同轴设置，但也在所产生的远场涡流的区域中。 当遇到金属管的厚度缺陷时，由第一和/或第二组的一个或多个接收线圈检测由该缺陷引起的垂直于管轴的磁场。 第三接收线圈通过涡流检测与管道平行产生的磁场的相位变化。 使用由参考管和样本对象管的标准厚度产生的相变的比率作为有缺陷管中检测到的相变的校正因子，以精确地计算缺陷壁厚度。
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公开(公告)号：US5239881A
公开(公告)日：1993-08-31
申请号：US885694
申请日：1992-05-19
CPC分类号： F16H57/033 , H02K17/30 , H02K7/116 , F16H2057/0335 , Y10T74/19684
摘要： In a variable speed geared motor constructed by combining an inverter motor controllable in rotational speed by inverter drive with a gear reducer, the gear reducer is of a two-stage type, and a reduction ratio i of the gear reducer is suppressed so that i.ltoreq.N holds where N stands for a maximum reduction ratio of the inverter motor at which a constant torque characteristic can be ensured. Further, in a series of variable speed geared motors each satisfying the above conditions, a common ratio R of a series of reduction ratios i of the variable speed geared motors is set to 1.2-1.5. For example, the series is set to 2, 3, 4, 5, 6, and 8.Accordingly, the geared motor can be constructed lightly in weight, compactly, and at low costs, and it can be economically used in a rotational speed region of 200-900 rpm which is an ordinary region in driving of a pump or a high-speed conveyor.
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公开(公告)号：US5220852A
公开(公告)日：1993-06-22
申请号：US862135
申请日：1992-04-02
IPC分类号： F16H1/00 , F16H57/021 , F16H57/029
CPC分类号： F16H57/033 , F16H57/025 , Y10T74/19684 , Y10T74/19991 , Y10T74/2186
摘要： In a motor-equipped reduction gear device with a pre-stage, two covers, which have been indispensable in the past, namely a joint cover and a pre-stage cover, are integrated into a one-body cover (130). Also, the diameter (D1) of the addendum circle of the pinion (110) mounted on the tip of the motor shaft 108 is designed to be smaller than the diameter (D2) of the portion of the motor shaft (108) which extends into the one-body cover (130). This allows the one-body cover (130) to be mounted with the pinion (110) already attached to the tip of the motor shaft (108). The one-body cover (130) can freely and easily be attached to the motor (102) and the gear box (106). As a result, the number of parts is reduced and light weight and compactness are achieved, and accuracy of the center distance and parallelism are improved because cumulative machining errors can be avoided. Furthermore, cost down and improved rigidity are achieved and the number of factors which may cause oil leakage is decreased.
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