GB630806A - Tachometer - Google Patents

Tachometer

Info

Publication number
GB630806A
GB630806A GB16949/47A GB1694947A GB630806A GB 630806 A GB630806 A GB 630806A GB 16949/47 A GB16949/47 A GB 16949/47A GB 1694947 A GB1694947 A GB 1694947A GB 630806 A GB630806 A GB 630806A
Authority
GB
United Kingdom
Prior art keywords
drag
drag element
magnetic
rotation
relative movement
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
GB16949/47A
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.)
Schneider Electric USA Inc
Original Assignee
Square D Co
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 Square D Co filed Critical Square D Co
Publication of GB630806A publication Critical patent/GB630806A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G01P3/49—Devices characterised by the use of electric or magnetic means for measuring angular speed using eddy currents
    • G01P3/495—Devices characterised by the use of electric or magnetic means for measuring angular speed using eddy currents where the indicating means responds to forces produced by the eddy currents and the generating magnetic field
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Distances Traversed On The Ground (AREA)

Abstract

630,806. Speedometers. SQUARE D CO. June 26, 1947, No. 16949. Convention date, July 25, 1946. [Class 106 (iii)] A tachometer comprises a rotatable drag element (18) of high conductivity material, means (21) biassing the drag element against rotation, indicating means (23) operated by the drag element, and magnetic drag means (8) mounted for rotation about an axis parallel and eccentric to the axis of the drag element with the drag element disposed in the field of the magnetic drag means so that relative movement is produced between the magnetic field and the drag element upon rotation of the magnetic drag means, the relative movement having a substantial directional component radial of the drag element to dampen its movement. The two sections of the drag means 8 have poles arranged as shown in Fig. 3, the upper section poles being complementary to those of the lower section. A second, independently rotatable drag means may be arranged to influence the common drag element 18 (Fig. 2, not shown) which will then be displaced in proportion to the algebraic sum of the rotative speeds. The shape of the drag element 18 may be varied, either in thickness or profile, in order to increase the scale of the dial reading at critical speed ranges.
GB16949/47A 1946-07-25 1947-06-26 Tachometer Expired GB630806A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US630806XA 1946-07-25 1946-07-25

Publications (1)

Publication Number Publication Date
GB630806A true GB630806A (en) 1949-10-21

Family

ID=22046792

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16949/47A Expired GB630806A (en) 1946-07-25 1947-06-26 Tachometer

Country Status (1)

Country Link
GB (1) GB630806A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683229A (en) * 1950-10-13 1954-07-06 Electro Mecanique De Laveyron Electrodynamic brake
DE968878C (en) * 1952-07-16 1958-04-03 O K Instr G M B H Eddy current tachometer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683229A (en) * 1950-10-13 1954-07-06 Electro Mecanique De Laveyron Electrodynamic brake
DE968878C (en) * 1952-07-16 1958-04-03 O K Instr G M B H Eddy current tachometer

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