GB1179754A - Position-Measuring Apparatus - Google Patents

Position-Measuring Apparatus

Info

Publication number
GB1179754A
GB1179754A GB4869367A GB4869367A GB1179754A GB 1179754 A GB1179754 A GB 1179754A GB 4869367 A GB4869367 A GB 4869367A GB 4869367 A GB4869367 A GB 4869367A GB 1179754 A GB1179754 A GB 1179754A
Authority
GB
United Kingdom
Prior art keywords
disc
pickups
gauge
phase difference
strips
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4869367A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1179754A publication Critical patent/GB1179754A/en
Expired legal-status Critical Current

Links

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
    • G01D5/2006—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 by influencing the self-induction of one or more coils
    • G01D5/2013—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 by influencing the self-induction of one or more coils by a movable ferromagnetic element, e.g. a core

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

1,179,754. Measuring displacements electrically. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Oct.26, 1967 [Oct.29, 1966], No.48693/67. Headings G1A and G1N. The position or variation in position of a linearly movable object is measured by a device comprising a rotating disc 5, Fig. 1, provided round its circumference with strips 1 having the form of involutes whose common evolute is a circle 2a contacting a line 2 along which equally spaced marks 3 of a gauge movable with the body, are arranged. The disc 5 is rotated at a constant speed and the relative position of the strips and marks is sensed using an inductive or capacitative pickup or optically to produce an A. C. signal whose phase is indicative of the position of the gauge. As shown, Fig.2, the pickup comprises a permanent magnet 8 surrounded by a coil 9, the marks 3 and strips 1, which are formed of magnetically permeable material, being arranged in a magnetic circuit 12 to vary the air gap dependent on their presence or absence. The A.C. signal generated in the coil 9 may be compared with a reference A. C. signal, in phase with the output signal for a given position of gauge and disc, to determine the phase difference and variation in position of the gauge. Alternatively the A. C. signals generated by two pickups (15), (16), Fig. 3a (not shown) associated with the gauge (14) arranged at either end of a diameter of the circuit 2a, may be compared in phase, a phase difference of 360‹ resulting from a movement of half a pitch of the gauge. To correct for the effects of the eccentric mounting of the disc, which produces an additional phase difference between the outputs of the two pickups, dependent on the angular position of the disc, the angular position of the disc is sensed inductively by pickups (23), (24), Fig.5a (not shown) which detect the presence of marks (24) of magnetic material arranged concentrically on the disc 5 and having the same pitch angle as the strips. The two output signals from these pickups also have the same phase difference as that of the outputs of pickups (15), (16) produced above by eccentric mounting of the disc, the signals being used to eliminate the effects of this phase difference from the outputs of pickups (15), (16).
GB4869367A 1966-10-29 1967-10-26 Position-Measuring Apparatus Expired GB1179754A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP0040698 1966-10-29

Publications (1)

Publication Number Publication Date
GB1179754A true GB1179754A (en) 1970-01-28

Family

ID=7377304

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4869367A Expired GB1179754A (en) 1966-10-29 1967-10-26 Position-Measuring Apparatus

Country Status (2)

Country Link
DE (1) DE1548764A1 (en)
GB (1) GB1179754A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3212149A1 (en) * 1982-04-01 1983-10-13 Oelsch KG, 1000 Berlin Angle-of-rotation sensor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009023395B4 (en) * 2009-05-29 2019-06-19 Lakeview Innovation Ltd. Code disc for an encoder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3212149A1 (en) * 1982-04-01 1983-10-13 Oelsch KG, 1000 Berlin Angle-of-rotation sensor

Also Published As

Publication number Publication date
DE1548764A1 (en) 1970-04-16

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