GB1419593A - Motor speed control system - Google Patents

Motor speed control system

Info

Publication number
GB1419593A
GB1419593A GB1008873A GB1008873A GB1419593A GB 1419593 A GB1419593 A GB 1419593A GB 1008873 A GB1008873 A GB 1008873A GB 1008873 A GB1008873 A GB 1008873A GB 1419593 A GB1419593 A GB 1419593A
Authority
GB
United Kingdom
Prior art keywords
magnet
layer
motor
homopolar
silver
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
GB1008873A
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing 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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of GB1419593A publication Critical patent/GB1419593A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/54—Controlling, regulating, or indicating speed by stroboscope; by tachometer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P13/00—Indicating or recording presence, absence, or direction, of movement
    • G01P13/02—Indicating direction only, e.g. by weather vane
    • G01P13/04—Indicating positive or negative direction of a linear movement or clockwise or anti-clockwise direction of a rotational movement
    • G01P13/045—Indicating positive or negative direction of a linear movement or clockwise or anti-clockwise direction of a rotational movement with speed indication
    • 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
    • G01P3/46—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring amplitude of generated current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K31/00—Acyclic motors or generators, i.e. DC machines having drum or disc armatures with continuous current collectors
    • H02K31/02—Acyclic motors or generators, i.e. DC machines having drum or disc armatures with continuous current collectors with solid-contact collectors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/20—Structural association with auxiliary dynamo-electric machines, e.g. with electric starter motors or exciters

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Velocity Or Acceleration (AREA)

Abstract

1419593 Automatic speed control systems MINNESOTA MINING & MFG CO 1 March 1973 [13 March 1972] 10088/73 Heading G3R [Also in Division H2] In a homopolar tachogenerator 18, Fig. 1, which is used in a circuit for servo-controlling a tape drive motor 10 in accordance with a reference input signal 15, an aluminium disc 26, Fig. 2, supporting a silver conducting layer 24 via adhesive 28 is coupled to the drive-shaft 30 of the motor 10 such that the layer 24 rotates at the speed of the motor in the homopolar flux set up in a magnetic circuit 34 by a ring magnet 36; an output signal proportional to the speed is taken from two contacts 46, 48 connected to pairs of inner/outer silver carbon brushes 40/41 contacting the layer 24, and is fed back to a difference sensor 14, Fig. 1. In the arrangement of Fig. 3 (not shown), a silver layer (52) on the outside of a steel drum (56) rotates in the homopolar flux of a ring magnet (66). It is stated that the magnets in the above embodiments need not be stationary, e.g. magnet 36 could be secured to disc 26 in Fig. 2, and in Fig. 3 (not shown) a permanent magnet could be substituted for the steel drum (56) and the stationary magnet (66) eliminated.
GB1008873A 1972-03-13 1973-03-01 Motor speed control system Expired GB1419593A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23425572A 1972-03-13 1972-03-13

Publications (1)

Publication Number Publication Date
GB1419593A true GB1419593A (en) 1975-12-31

Family

ID=22880593

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1008873A Expired GB1419593A (en) 1972-03-13 1973-03-01 Motor speed control system

Country Status (4)

Country Link
JP (1) JPS492509A (en)
CA (1) CA988981A (en)
DE (1) DE2311943B2 (en)
GB (1) GB1419593A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4306921A (en) 1978-03-16 1981-12-22 Kanto Denka Kogyo Co., Ltd. Production of magnetic powder

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5177071A (en) * 1974-12-27 1976-07-03 Fujitsu Ltd HANDOTAISOCHINO ANTEIKAHOHO
JPS5224464A (en) * 1975-08-15 1977-02-23 Westinghouse Electric Corp Method of selectively diffusing impurities in silicon substrate
BR8104693A (en) * 1980-07-22 1982-04-06 Xerox Corp APPLIANCE SENSITIVE TO THE DISPLACEMENT OF A MOBILE ELEMENT TO GENERATE A PLURALITY OF SIGNS ELECTRICALLY DISPLACED IN PHASE
DE3719580A1 (en) * 1987-06-12 1988-12-29 Broadcast Television Syst CIRCUIT ARRANGEMENT WITH A REGULATOR

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4306921A (en) 1978-03-16 1981-12-22 Kanto Denka Kogyo Co., Ltd. Production of magnetic powder

Also Published As

Publication number Publication date
DE2311943A1 (en) 1973-09-20
DE2311943B2 (en) 1974-08-29
JPS492509A (en) 1974-01-10
CA988981A (en) 1976-05-11

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee