Classifications

• • 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
  • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
  • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
  • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
  • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
  • G01D5/22—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
  • G01D5/2291—Linear or rotary variable differential transformers (LVDTs/RVDTs) having a single primary coil and two secondary coils

Definitions

• the invention relates to a magnetic field sensor arrangement for path detection on rotationally and / or linearly moved components, in which spatial components of a magnetic field change over the path to be detected and can be detected accordingly, according to the features of claim 1. that for example in speed and position sensors, as z.
• a rotational movement or position change is detected by a rotation or the change in position corresponding change in a magnetic field.
• magnetic sensors known per se are generally used, which depending on the application and field of application can be Hall sensors, AMR sensors, GMR sensors, TMR sensors or, in general, XMR sensors.
• the invention is therefore based on a magnetic field sensor arrangement for detecting the position of moving components, in which spatial components of the magnetic field of a magnetic component or magnet system on the moving component change in their direction over the path to be detected on the magnetic component and thereby the relative position A sensor can be detected accordingly.
• the magnetic field of the magnetic component is at a predetermined angle between the axial direction and radial alignment with the direction of movement of the moving component is aligned.
• the angular range of the detectable magnetic field directions can be up to 200 ° in the course of the path detection.
• a magnetized component on an actuating element for. B. in vehicle braking systems, be mounted that at least in a further axis in addition to a linear direction to be detected, usually rotatable or in any other degree of freedom moves.
• the invention is also suitable for cramped installation situations in a motor vehicle and, on the other hand, can also be used outside of vehicle brake systems in a wide variety of applications.
• sensors with an XMR effect or Hall sensors are used, each detecting the changing in the course of the linear movement or a movement in other degrees of freedom direction of the magnetic field.
• the angle to the linear direction of movement of the component moved in rotation is advantageously in the range of 45 ° in a preferred exemplary embodiment.
• the magnetic circuit has at least one magnetization direction which is different from the axis of the movement direction but is not perpendicular to the axis of the movement direction. Due to this so-called oblique direction of the magnetic field, a magnetic field is generated on the sensor, which has a relatively wide measuring range with regard to the detectable directional differences of the field lines.
• the magnetic field directions of these magnets may also differ from one another.
• this magnetic circuit is rotationally symmetrical and is thus rotatable about the axis of the direction of movement, but without causing a change in the direction of the magnetic field on the scanning sensor during the rotation.
• the magnetic circuit for the magnetic field sensor according to the invention thus preferably also consists of at least one magnet which is rotatable about the axis of the linear direction of motion and generates a magnetic field which continuously and monotonously changes the magnetic field direction over the linear path to be measured.
• the magnet system can be shorter than the measuring path.
• a relatively short magnetic field sensor with a likewise relatively short magnet system can be realized, but a relatively long measuring path (magnetic field sensor and magnet system are shorter than the measuring path) for applications with limited space can be achieved. Nevertheless, the magnetic circuit described here produces a maximum detectable change in the magnetic field orientation over the measuring path.
• the invention can be implemented with a flexible magnet system with regard to the number of magnets, the magnetization directions (individually or in combination) and permits use in different installation spaces, in different applications and with different measurement paths. Short description of the drawing
• FIG. 1 shows a schematic representation of a so-called oblique magnetization of two individual magnets and a sensor scanning the magnetic field direction.
• Figure 2 is a schematic representation of a so-called oblique magnetization of a single magnet and a magnetic field scanning sensor.
• FIG. 3 shows an exemplary embodiment of an arrangement for measuring pedal travel in a motor vehicle with a magnetic field sensor arrangement according to the invention.
• FIG. 4 shows a detailed view of a ring magnet of the magnetic field sensor arrangement according to FIG. 3.
• a magnetic circuit shown schematically in FIG. 1 to explain the invention consists of two individual magnets 1 and 2 whose magnetic field lines 3 and 4, which are inclined here in the preferred direction, are shown schematically.
• the magnetic field lines 3 or 4 intersect a magnetic-field-sensitive sensor 5 (here a field line 3 in the case shown), wherein it can be seen that the direction of the respective field lines 3 or 4 depends on which relative position the sensor 5 is on the linear path 6 of the magnetic circuit is currently located. If one now uses a sensor 5, for example an XMR sensor or a Hall sensor, whose output signal is currently dependent on the direction of the intersecting magnetic field lines 3 or 4, a relative position determination between the magnetic circuit with the magnets 1, 2 is with this basic arrangement and the sensor 5 possible.
• FIG. 2 shows a further possibility of such a position determination with a single magnet 7 which is magnetized obliquely in the preferred direction and whose magnetic Field lines 8 here in the same way as in the figure 1 depending on the direction of the cutting magnetic field lines 8 allow a relative position determination between the magnet 7 and the sensor 5.
• FIG. 3 shows an exemplary embodiment of a magnetic field sensor arrangement according to the invention, for example for the detection of pedal travel in a vehicle brake system, in which a sensor housing 10 accommodates a magnetic-field-sensitive sensor corresponding to the sensor 5 according to the previously described figures.
• the magnetic circuit here has two ring magnets 11 and 12, which are rotatably movable on a rotational axis 13 and along the axis of rotation 13 linearly.
• FIG. 4 shows, as a more detailed exemplary embodiment, the ring magnet 11 (or corresponding to FIG. 12), which is magnetized here in the preferred direction 14 at an angle, for example at 45 ° to the rotation axis 13 according to FIG.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)
• Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
• Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (2)

Family

ID=44149001

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (24)

Citations (2)

Family Cites Families (15)

• 2009
  • 2009-12-21 DE DE200910055104 patent/DE102009055104A1/de not_active Ceased
• 2010
  • 2010-10-22 EP EP10768240A patent/EP2516967A2/de not_active Withdrawn
  • 2010-10-22 JP JP2012543543A patent/JP5606550B2/ja not_active Expired - Fee Related
  • 2010-10-22 CN CN201080058122.6A patent/CN102686980B/zh not_active Expired - Fee Related
  • 2010-10-22 CN CN201510867247.8A patent/CN105509775B/zh not_active Expired - Fee Related
  • 2010-10-22 WO PCT/EP2010/065925 patent/WO2011085833A2/de not_active Ceased

Patent Citations (2)

Also Published As

Similar Documents

Legal Events