Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P1/00—Details of instruments
  • G01P1/02—Housings
  • G01P1/026—Housings for speed measuring devices, e.g. pulse generator
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
  • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
  • G01D11/24—Housings ; Casings for instruments
  • G01D11/245—Housings for sensors
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
  • G01P3/42—Devices characterised by the use of electric or magnetic means
  • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
  • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
  • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
  • G01P3/488—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by variable reluctance detectors
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/28—Coils; Windings; Conductive connections
  • H01F27/29—Terminals; Tapping arrangements for signal inductances

Definitions

• Coil former Coil former, inductive speed sensor and process for its manufacture
• the present invention relates to a coil former, an inductive
• the invention relates in particular to a coil former, which is used both for an axial inductive
• Speed sensor as well as for a radial inductive speed sensor can be used.
• Speed sensors are used in vehicle technology to measure the speed of rotation of rotatable components. For anti-lock braking systems to function correctly, for example, it is necessary to continuously determine a speed of the wheel in question. These speed sensors use, for example, an inductive measurement to determine a rotational speed of a magnet wheel relative to a coil. Such sensors are very robust against environmental influences, such as those in
• inductive speed sensors can be manufactured as radial or axial sensors.
• the electrical connection line is guided axially away from the speed sensor with respect to the coil used and can therefore be guided parallel to an axial axis around which the turns of the coil run.
• the electrical connection lines run out of the speed sensor in the radial direction (perpendicular to the axial axis). Depending on how the cable routing is desired, one of the two variants is used.
• Speed sensor-specific coil former and / or busbars are used, which can be used either for the radial or for the axial variant. This affects flexibility and makes production complex.
• the present invention relates to a coil former for an inductive speed sensor.
• the coil body comprises a base body, the one
• the coil former has winding area for coil windings around an axial axis and an opening for receiving a pole assembly along the axial axis.
• the coil former comprises two busbars, each running parallel to the axial axis and having a contact area for electrical connection lines, in order to connect the coil in the winding area to the electrical connection lines.
• Each contact area has at least one bendable section in order to optionally lead the electrical connection lines at least in sections parallel to the axial axis or, perpendicularly thereto, radially.
• the coil former can thus be used both for a radial speed sensor and for an axial speed sensor.
• the two busbars can advantageously be of the same design, can be attached to the base body on opposite sides and are bent differently in the bendable section for the radial variant than for the axial variant.
• the bendable portion is formed on the busbars and may include a thinned portion, notches, perforations, or other means that facilitate controlled bending along a desired line.
• the coil body includes at least one anti-rotation device, which can be designed as a radial projection on the base body, in order to prevent the coil body from rotating during a molding process (or another method for sheathing) by a stop in an exemplary molding tool prevent.
• the winding section can be delimited on one side or on both sides in the axial direction by at least one disk-shaped section, the at least one radial projection of the anti-rotation device being at least 0.5 mm or at least 1 mm or more than 1.5 mm in the radial direction over the at least one
• the base body comprises at least one latching hook, which is designed to fix a pole assembly inserted in the opening of the base body, so as to prevent axial movement of the pole assembly used.
• the base body comprises at least one ventilation opening, one
• the two busbars each comprise a compressible slot in which a wire of the coil can be inserted.
• the slot can be designed to reduce its slot width when compressed, whereby cutting through the inserted wire is prevented by opposing stops. This can be achieved, for example, via a slot width and / or slot length and / or depth, but also via an edge rounding, which makes it difficult to cut through.
• the two busbars can be deburred in the area of the slot by a (double-sided) embossing in order to prevent the coil wires from being cut when the electrical contact to the coil is formed.
• the two busbars each include a tab that has a
• Busbars can also each have a barrier that is designed to divert an encapsulation compound in the encapsulation tool during the exemplary encapsulation process, in order to protect electrical contact with the coil.
• the contact areas each include a surface for a connection in the form of welding or soldering or crimping the electrical
• the present invention also relates to an inductive speed sensor with a previously defined coil body, a coil winding (coil) in the
• the inductive speed sensor comprises a sheathing made of a plastic material, in particular of an encapsulation compound, which connects the coil body with the coil winding and the
• the anti-rotation device partially protrudes (radially) from the casing or extends at least to an outer surface of the casing.
• the anti-rotation device appears after the casing as a raised structure on an outer surface of the casing.
• the shroud includes one or more ribs and a plateau on which the rib (s) ends.
• the inductive sensor can comprise a protective sleeve (e.g. made of a magnetically non-conductive metal) which is at least partially formed around the casing and can be joined to the casing by caulking using the plateau.
• the inductive speed sensor includes electrical connection lines that are connected to the contact areas and run at least partially parallel to the axial axis to form an axial speed sensor or run perpendicular to it to form a radial speed sensor.
• the present invention relates to a method for producing a
• Busbar for a coil former as previously defined.
• the process includes the steps: - punching a flat metal to form an (electrical) contact area, a connection area for the coil windings and an intermediate area between the contact area and the connection area;
• connection area to form a U-shaped end portion with the slot in a protruding leg
• busbar is used for a radial inductive sensor, again bending an end portion of the contact area about an axis that is perpendicular to the flat metal.
• this method may include bending up a portion of the flat metal (e.g., a die cut) to form a barrier and / or a
• the present invention relates to a method for producing a
• Coil former for an inductive speed sensor includes:
• a base body which comprises a winding area for coil windings around an axial axis and an opening for receiving a pole assembly along the axial axis;
• the method comprises bending the contact areas in a bendable section provided for this purpose, perpendicular to the axial axis, in order to guide the electrical connection lines perpendicularly to the axial axis, at least in sections.
• Process steps should be restricted. In further embodiments the process steps for both processes can be carried out in a different order.
• Embodiments of the present invention overcome the aforementioned problems with a universal coil former, which can be used for both the axial and the radial variant of the inductive speed sensor.
• two identical busbars can be used for this coil former, which are only bent once more in the case of a radial speed sensor, in order to lay the electrical connection lines in the radial direction.
• the conventional speed sensors use different coil formers and / or different busbars for the axial and radial variants.
• the universal bobbin the number of parts required is reduced.
• simple manufacture and assembly are made possible, which in turn leads to considerable cost reductions.
• An anti-twist device prevents unwanted twisting during the exemplary extrusion process.
• a separate bracket is not required.
• a locking hook can reliably prevent the movement of the magnet or the pole core during the manufacturing process.
• the magnet / pole core can be easily removed if the coil winds incorrectly. The percentage of rejects in the case of faulty production is minimized.
• the vent channel prevents the formation of air cushions between the
• Magnets and the pole core when inserting the magnet so that rapid production and in particular automated production is made possible.
• the tab allows easy and reliable axial securing of the
• the barrier repels the granulate or the encapsulation compound, so that reliable protection of the welding point is achieved during the encapsulation process.
• 1A, 1B show a coil former according to an embodiment of the
• 4A-4C show an example of forming the casing and attaching the
• FIG. 1A shows a cross-sectional view of a coil former according to one
• the coil former comprises a base body 100, which in turn has a winding region 110 for the coil windings 10, which are wound around an axial axis R (see FIG. 1B).
• the bobbin also includes an opening 120 which is provided to insert a pole assembly there along the axial axis R.
• the coil former further comprises two busbars 200, a first busbar 201 and opposite a second busbar 202, each of which extends parallel to the axial axis R.
• the winding area 110 is also axially shaped by a disk-shaped one
• End portion 115 delimited so as to form coil windings 10 in the winding area 110.
• the end section 115 comprises a hole (central opening) 105 in order to allow a pole core to protrude from the coil former and thus to be able to effectively transmit the magnetic field.
• the exemplary embodiment comprises anti-rotation devices 150 (see FIG. 1B) which are designed as projections on the base body 100.
• the projections 150 extend, for example, by at least 0.1 mm beyond the disk-shaped end sections 115 in the radial direction. This makes it possible for the coil former, for example, in an encapsulation tool or another
• Spacers can serve in the exemplary extrusion die
• the anti-rotation devices 150 can comprise various forms of projections.
• the anti-rotation devices 150 can be designed as pin-shaped elements (protrude from the image plane of FIG. 1B) or as arrow-shaped elements (extend upwards in FIG. 1B), which then later form part of a rib of the casing still to be formed can form.
• the base body 100 further comprises a latching hook 130, which is designed to hold an inserted pole assembly in the opening 120 in the axial direction. Furthermore, there are openings 140 in the base body 100 are provided, which serve to enable the insertion of the pole assembly into the opening 120 by pressure equalization between an inner region of the base body 100 and an outer region, so that the pole assembly can be inserted into the opening 120 easily and quickly.
• the two busbars 200 are used to make electrical contact with the coil 10 in the winding region 110 using the electrical connecting lines (not shown in FIGS. 1A, 1B).
• Each contact area 220 comprises a bendable section 230, which makes it possible to bend the contact area 220 at least partially perpendicular to the axial axis R (in FIG. 1A from the image plane or into the image plane), in order to selectively an axial or radial speed sensor to enable. If the contact areas 220 are not bent or at most are bent in the direction of the axial axis R, the coil former shown can be used for an axial speed sensor.
• Winding area 110 are connected in a connection area 15, each with a busbar 200 opposite the respective contact area 220.
• Busbars 200 formed.
• the tab 240 serves to axially fix the busbar 200, the tab 240 engaging, for example, in a corresponding recess in the base body 100, in order to prevent the busbar 200 from being displaced.
• FIG. 2A to 2D show further details of the busbar 200.
• FIG. 2A shows the busbar 200 in a spatial view
• FIG. 2B in a cross-sectional view
• FIG. 2C in a plan view
• FIG. 2D shows the busbar 200 as a
• the busbars 200 can in particular be designed in the same manner and are only arranged on opposite sides of the base body 100.
• the busbars 200 comprise the connection area 210 for the coil wire 12 on one side and the contact area 220 on the one side
• the busbar is angled perpendicular to a main surface in order to form a surface for contacting the electrical connecting lines.
• the contact area 220 includes at least one bending section 230, one
• connection area 210 for the coil wire 12 is bent in a U-shape and comprises a slot 260 in the projecting leg in order to insert at least one wire 12 of the coil 10 therein.
• connection area 15 between the coil 10 and the connection of the busbar 210 with the coil wire 12 is twisted several times in order to achieve a more stable one
• 2A and 2B also show a barrier-shaped extending
• Section 250 which is suitable for the connection area 210 at a
• this barrier 250 extends radially outward, so that when the coil former is inserted into an exemplary encapsulation tool, the corresponding encapsulation compound is passed around the barrier 250 and thereby a coil wire 12 in the slot 260 is not immediately exposed to the encapsulation compound, but only comes into contact with the encapsulation compound by redirection.
• the tab 240 is made as a vertically upwardly bent section of the busbar 200.
• the contact area 220 extends vertically upward (away from the axial axis R; see FIG. 1A).
• the busbar 200 can be produced, for example, in such a way that a
• the contact area 220 can be bent vertically upwards.
• the tab 240 is bent vertically upward in the intermediate section 270 and the connection region 210 is bent in a U-shape.
• the bendable section 230 is formed to facilitate a bend in the direction of the connection region 210. In the bendable section 230, for example, the cross-sectional area of the busbars 200 is correspondingly reduced via lateral material recesses in order to achieve a defined bend.
• the bendable portion 230 can, however, also be formed by a thinner material, by notches, by perforations or by other means which facilitate controlled bending along a desired line. This bend is used to flexibly adapt the busbar to the area of application (whether radial or axial sensor).
• the contact areas 220 form an area around the electrical
• connection lines 30 thereon. It is also possible to crimp the connecting lines 30 at the contact areas.
• the coil wires 12 can also be welded or soldered after insertion into the slot 260.
• FIG. 3 shows an inductive speed sensor according to an exemplary embodiment of the present invention, in which the coil former, as shown in FIGS. 1A and 1B, is surrounded by a sheath 300 and a sleeve 400.
• the contact regions 220 are bent such that they point towards the axial axis R (Y-shaped contacting) in order to connect axially guided electrical connecting lines 30 to them.
• the notch 232 in the busbars 200 can be used for this bend (see FIGS. 2C and 2D).
• FIG. 3 also shows the pole assembly 20, 25, which comprises a magnet 20 and a pole core 25, the pole core 25 being arranged as a separate section within the coil 10 and piercing the hole 105 in the disk-shaped end section 115.
• the most direct possible contact with the protective sleeve 400 is thus achieved in order to effectively conduct the magnetic field lines. This place can be free of the sheathing Be 300.
• the magnet 20 is inserted as a separate object in the opening 120 after the pole core 25. Since the hole 105 is closed after the insertion of the pole core 25, the lateral openings 140 (for example slots as can be seen in FIG. 1A) facilitate the insertion of the magnet 20, since the opening (s) 140 provide an air cushion via a pressure equalization prevent.
• FIG. 3 also shows that the barrier 250 effectively protects the connection region 210 with the slot 260 (see FIG. 2A) from the encapsulation compound.
• the metal sleeve 400 is fastened to the casing 300, for example, by caulking 410.
• An optional O-ring 450 is formed between the casing 300 and the protective sleeve 400, which provides a reliable seal between the interior of the
• FIG. 4A to 4C show the radial inductive speed sensor according to an exemplary embodiment of the present invention, it being without in FIG. 4A
• Sheath 300 and sleeve 400 is shown, which can be seen in FIGS. 4B and 4C.
• the end section of the contact area 220 is additionally bent, so as to make contact with the
• connection line 30 To allow connection line 30 in a radial direction.
• the contact areas 220 are bent perpendicularly away from the axial axis R (see FIG. 4A), so that the electrical
• the bendable sections 230 can be used for this (see FIG. 2B).
• Connection lines 30 are guided here in a U-shape towards the contact areas 220, so that the contact areas on the contact areas 220 are parallel to one another.
• a Y-shaped contacting can also be selected, as can be seen in FIG. 3 for the axial sensor.
• Bending sections 230, 232 it is possible to align the contact areas 220 in any direction: from parallel to a V or U-shaped arrangement of the two contact areas 220. A flexible electrical contact is thus possible and the connecting lines 30 can be laid almost anywhere.
• FIG. 4A shows the coil body together with the coil 10 and the inserted pole core 25 and magnets 20, which are held in the axial direction by the latching hook 130.
• FIG. 4B shows the result of forming the casing 300 and
• FIG. 4C shows the protective sleeve 400 applied.
• the anti-rotation devices 150 can be used to fix the coil former from FIG. 4A in the tool used for this.
• the fixation of the magnet 20 and the pole core 25 by means of a latching hook 130 offers the advantage that the magnet 20 or pole core 25 can in turn be removed in the event of a manufacturing defect, and the rejects in production are thus minimized.
• the pole core 25 can, for example, be a finished part that does not require reworking.
• FIG. 4B shows the radial inductive sensor before the protective sleeve 400 is applied.
• the casing 300 is designed such that it forms a plurality of ribs 330 on the outer surface.
• the anti-rotation device 150 can be designed, for example, as an arrow-shaped projection (the anti-rotation device 150 pointing vertically upward in FIG. 4A) and can become part of the rib 330 after the sheathing.
• the ribs 330 end, for example, on a plateau 340.
• the plateau 340 can be used to connect the protective sleeve 400 to the casing 300 via caulking 410.
• anti-rotation devices 150 can be designed, for example, as pins (in FIG. 4A the anti-rotation device 150 protruding from the plane of the drawing), which extend at least up to a surface (or slightly beyond) of the casing 300.
• at least one anti-rotation device is designed such that the casing forms a groove 331, as shown in FIG. 4B.
• 4C shows the radial inductive sensor, in which the protective sleeve 400 is partially formed around the casing 300.
• the protective sleeve 400 is joined to the casing 300 by at least one caulking 410 using the plateau 340.
• the ribs 330 are shaped such that they cause a sleeve clamping (ie a firm hold of the sleeve 400 without play).
• Injection molding tool is reliably ensured via the anti-rotation devices 150, which moreover do not have to be reworked, since they become part of the ribs 330, which is used for the sleeve clamping.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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• 2018
  • 2018-12-18 DE DE102018132694.7A patent/DE102018132694A1/de active Pending
• 2019
  • 2019-12-03 JP JP2021535193A patent/JP7161056B2/ja active Active
  • 2019-12-03 US US17/312,356 patent/US20220018870A1/en active Pending
  • 2019-12-03 EP EP19813827.3A patent/EP3899551A2/de active Pending
  • 2019-12-03 CN CN201980092443.9A patent/CN113454465B/zh active Active
  • 2019-12-03 WO PCT/EP2019/083519 patent/WO2020126482A2/de unknown
  • 2019-12-03 BR BR112021010137-3A patent/BR112021010137A2/pt active IP Right Grant

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