公开(公告)号：EP1274974B1

公开(公告)日：2004-09-22

申请号：EP01931551.4

申请日：2001-03-28

申请人： Fast Technology AG

发明人： MAY, Lutz, Axel

IPC分类号： G01L1/12 ,  G01L3/10 ,  H01L41/00

CPC分类号： G01M5/0091 ,  G01L1/125 ,  G01L3/102 ,  G01M5/0016 ,  G01M5/0041

摘要： A force transducer element (20) comprises a body (22) of magnetisable material having at least one magnetised region (30) at an angle, say 45 DEG , to the force-sensing direction (P-P). Preferably there are a plurality of parallel magnetised regions of alternating opposite polarity of magnetisation to form closed loops (43p, 43n). The element may be a block having opposite force receiving surfaces (24, 24'). The body (122) may contain plural transducer elements (120a, 120b) angled to one another to resolve force directions. The principle is extended to a circular transducer element (243). The invention may be implemented in a flexible magnetic tape. Another embodiment (300) is realised in a planar structure in which a ferromagnetic core (310) is subject to a magnetic field (326) at an angle to the direction (F) of force application generated by laterally offset coils (312, 314). A sensor device (330) is fabricated in the structure.

公开(公告)号：EP1366345A1

公开(公告)日：2003-12-03

申请号：EP02722048.2

申请日：2002-02-06

申请人： Fast Technology AG

发明人： MAY, Lutz, Axel

IPC分类号： G01L3/10 ,  G01L1/12

CPC分类号： G01L3/103

摘要： A region (22) of a shaft (10) may be given a permanent or stored longitudinal magnetisation by locating it within a helical coil (60) and rotating (28) the shaft about its axis (A-A) when applying a pulse of direct current (I) to magnetise at least an annular zone of the shaft. Successive pulses of opposite polarity are preferably employed, the first of higher magnitude saturating the shaft to greater depth, the second of lower magnitude to saturate the shaft to lesser depth. This provides outer and inner annuli of opposite polarity magnetisation. The same coil may be energised with alternating current while the shaft is moved axially through it in a pre-magnetisation procedure to magnetically cleanse or de-gauss the shaft. The coil may be energised subsequent to magnetisation with alternating current at a lower magnitude and/or higher frequency than for pre-magnetisation without the post-magnetisation field destroying the desired pattern of magnetisation.

公开(公告)号：EP1282810A2

公开(公告)日：2003-02-12

申请号：EP01931581.1

申请日：2001-04-10

申请人： Fast Technology AG

发明人： MAY, Lutz, Axel

IPC分类号： G01L3/10 ,  G01L1/12

CPC分类号： G01L3/102 ,  G01L3/103 ,  H01F13/003 ,  Y10T29/49075

摘要： A magnetic transducer element is formed in a portion (22) of a shaft (20) by an axially-oriented magnetic source (30) comprising a U-shape permanent magnet or electromagnet assembly, the gap (g) between the poles of which is small compared to the pole width (w). The source (30) is brought up to the continually rotating shaft (20) from a distance (D1) to a position closely proximate (D2) the shaft (20) and then retracting the source (30). With an electromagnet the mechanical movement may be emulated by controlling the energising of the electromagnet. An annular, surface-adjacent zone of axially-directed magnetisation is created whose external detectable field (40) has a distribution in the axial direction which shifts axially under applied torque. An axial or radial component may be sensed as a measure of torque. A method of preparing the shaft for magnetisation (magnetic-cleansing) and a post-magnetisation procedure is disclosed.

公开(公告)号：EP1415170A1

公开(公告)日：2004-05-06

申请号：EP02764837.7

申请日：2002-08-07

申请人： Fast Technology AG

发明人： MAY, Lutz, Axel ,  CUNTZE, Georg

IPC分类号： G01R33/04

CPC分类号： G01R33/04

摘要： A sensor inductor (1) for magnetic fields, particularly of the saturating-core type, has at least one inductor coil (10) which is wound as a planar spiral about a core (20). More preferably a plurality of planar spirals (10a-10d) are stacked along the axis (50) of the core. A pair of adjacent coils (10a:10b) are wound as spirals of opposite sense with the inner ends (32a: 32b) connected together by bridges (44). Two or three such pairs may be used. The plural coils (10a-10d) and the central core (20) may be fabricated using planar selective deposition techniques known from the semiconductor industry. The magnetic core (50) may be a separate entity inserted into an axial hole formed through the stack of coils. A preferred core material is permalloy. Turns width (w), spacing (s) and thickness (t) of the spiral coils is discussed together with the axial spacing (d) between coils and core diameter (Ζ)

摘要翻译： 用于磁场的传感器电感器（1），特别是饱和磁心型的传感器电感器（1）具有至少一个绕着芯（20）缠绕成平面螺旋的电感器线圈（10）。 更优选地，多个平面螺旋（10a-10d）沿着芯的轴线（50）堆叠。 一对相邻的线圈（10a：10b）以与通过桥（44）连接在一起的内端（32a：32b）相反的方向缠绕。 可以使用两个或三个这样的对。 多个线圈（10a-10d）和中心核心（20）可以使用半导体工业已知的平面选择性沉积技术制造。 磁芯（50）可以是插入穿过线圈堆叠形成的轴向孔中的单独实体。 优选的核心材料是坡莫合金。 讨论了螺旋线圈的旋转宽度（w），间距（s）和厚度（t）以及线圈之间的轴向间距（d）和纤芯直径（Z）

公开(公告)号：EP1360468A1

公开(公告)日：2003-11-12

申请号：EP02718048.8

申请日：2002-01-24

申请人： Fast Technology AG

发明人： MAY, Lutz, Axel

IPC分类号： G01L3/10

CPC分类号： G01L3/105 ,  G01L3/102 ,  G01L3/104

摘要： A hand-held unit for measuring torque has a magnetic structure (40) with two-spaced pole ends (44a:44b) of opposite polarity applicable at or adjacent to the surface of a portion (32) of a rotating shaft (30) of ferromagnetic material, the poles (44a:44b) being spaced in the direction of the shaft axis. An axially-directed, surface-adjacent magnetic flux (52) is induced in the local portion of the shaft (30) between the poles. A magnetic sensor device (60) intermediate the poles (44a:44b) is oriented to detect a torque-dependent component of the induced magnetic field external to the shaft surface. The magnetic structure incorporates a magnetic source (16) provided by a permanent magnet (46') or a D.C. or A.C. energised coil (50).

公开(公告)号：EP1221030B1

公开(公告)日：2004-01-02

申请号：EP00972736.3

申请日：2000-10-10

申请人： Fast Technology AG

发明人： MAY, Lutz, Axel

IPC分类号： G01L3/10

CPC分类号： G01L3/105 ,  G01L3/102

摘要： Torque in a shaft (61) is detected by means of non-contacting sensors (23, 24) sensing a torque-dependent magnetic field emanated by an integral transducer region (64, 32) of the shaft (61) that is circumferentially or longitudinally magnetised. The shaft (61) is driven by a motor (63) and subject to a longitudinal magnetic field (60) which acts on interference field. In one implementation of the invention coils (L1, L2: L3, L4) are energised to provide a counteracting magnetic field to compensate the interference field (60).

公开(公告)号：EP1409962A2

公开(公告)日：2004-04-21

申请号：EP01985823.2

申请日：2001-11-21

申请人： Fast Technology AG

发明人： MAY, Lutz, Axel

IPC分类号： G01D5/14 ,  G01D5/16 ,  G01D5/20

CPC分类号： G01D5/2033 ,  G01D5/145 ,  G01D5/2006 ,  G01D5/2452

摘要： A magnetic transducer for measuring the angle about an axis (A-A) of a part such as a shaft (10) is constructed to emanate a magnetic field which is detectable by a fixed sensor (30) to produce a signal which is dependent on the angle. The construction may include a transducer element (20) mounted eccentrically with respect to the axis or a magnetically-conductive element having a surface whose radius is a function of angle. Alternatively a part of circular cross-section is given a radial depth of permanent magnetisation which is a function of angle or is provided with a magnetised zone of different magnetic property to the remainder and having a radial depth which is a function of angle. Such a zone may be a case-hardened zone of a steel part. Transducer regions arranged at 90° can be used in resolving ambiguities in the measurement. The transducer region or a magnetically conductive part thereof may provide a cyclic variation of the emanated magnetic field within one revolution of 360°.

公开(公告)号：EP1360466A1

公开(公告)日：2003-11-12

申请号：EP02710844.8

申请日：2002-02-06

申请人： Fast Technology AG

发明人： MAY, Lutz, Axel

IPC分类号： G01L1/08 ,  G01L5/10

CPC分类号： G01L5/10 ,  G01L1/086

摘要： A force sensor device establishes a balance of forces on an axially-displaceable sensor member (70) which is at least partly of magnetic material. For a horizontal sensor member (70) the balance is between a constant magnetic bias force (F4) and an opposed counteracting magnetic force (F1) generated by an energised coil (L1) whose energisation is controlled in a feedback loop (88) dependent on the sensed axial positions of the sensor member (70). For a vertical sensor member the balance is between gravity (weight) and the counteracting magnetic force (Fig. 2). The feedback loop (88) is preferably of the second-order kind (fig. 7). The generation of magnetic force is by having an end (75) of a magnetic portion (72) of the sensor member terminate within a coil (L1) to generate a solenoid-like attractive force thereon. A magnetic-position sensing device detects the position-sensitive coupling of two coils (L2:L3) by a magnetic portion (74) of the sensor member (70) which extends entirely through one coil (L2) and terminates within the other. A force (T) to be measured is applied axially to the sensor member (70) acting to disturb the force balance. The force sensor device has application to measuring tension in a running thread (Fig. 4).

公开(公告)号：EP1356257A1

公开(公告)日：2003-10-29

申请号：EP02718049.6

申请日：2002-01-24

申请人： Fast Technology AG

发明人： MAY, Lutz, Axel

IPC分类号： G01L3/10 ,  G01L1/12

CPC分类号： G01L3/102 ,  G01L3/104

摘要： A magnetic transducer element comprises at least one magnet (54a-c) which is axially disposed along the axis of a tubular or bored shaft (30) along which torque is transmitted. The wall (34) of the shaft (30) is of ferromagnetic material. The poles (N:S) of each magnet (54a-c) bear against low reluctance discs (56a-d) which provide a good magnetic connection to the inner wall (32) of tube (34) defining annular regions encircling the respective magnet (54a-c) to provide respective annular flux distribution (58a-c) therein. Each region has an external torque-sensitive component (62a-c) which is detectable by a sensor arrangement (64). The magnets are of significantly smaller diameter than the interior wall (32) of tube (34). The use of discs (56a-d) can be avoided if the magnets are made a close fit within the bore of tube (34). In a modification (Fig. 6) a transducer region is provided between the spaced opposite polarity poles of a pair of magnets. The magnets may be permanent magnets or equivalent electromagnets.

公开(公告)号：EP1317663A1

公开(公告)日：2003-06-11

申请号：EP01982269.1

申请日：2001-09-11

申请人： Fast Technology AG

发明人： MAY, Lutz, Axel

IPC分类号： G01L3/10

CPC分类号： G01L3/105 ,  G01L3/104

摘要： A shaft (40) subject to torque about its axis (A-A) has an axial bore (42). A region (44) of the shaft (40) has a stored magnetisation, the region (44) being permanently magnetised with circumferential magnetisation about the axis (A-A) or an annulus of longitudinal magnetisation which is preferred. The stored magnetisation emanates a torque-dependent field into the bore (42). A magnetic field sensor arrangement (50) is positioned in the bore to produce a torque-dependent signal. The disclosure discusses the relationship between the radial depth (tm) of the permanent magnetisation in region (44) relative to the shaft wall thickness (t). Magnetic sensor placements include axial (52, 54) or offset arrangements of pairs of sensors (52a,b, 54,b). Dependent on the nature of the field to be sensed, sensors (5) may be oriented axially, radially or tagentially with respect to the axis (A-A).