JPS54160216A - Revolution control system - Google Patents

Revolution control system

Info

Publication number
JPS54160216A
JPS54160216A JP6921078A JP6921078A JPS54160216A JP S54160216 A JPS54160216 A JP S54160216A JP 6921078 A JP6921078 A JP 6921078A JP 6921078 A JP6921078 A JP 6921078A JP S54160216 A JPS54160216 A JP S54160216A
Authority
JP
Japan
Prior art keywords
revolutions
circuit
time
signal
motor
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.)
Pending
Application number
JP6921078A
Other languages
Japanese (ja)
Inventor
Masateru Sasaki
Shinji Okada
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP6921078A priority Critical patent/JPS54160216A/en
Publication of JPS54160216A publication Critical patent/JPS54160216A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions

Landscapes

  • Rotational Drive Of Disk (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

PURPOSE:To safely and surely perform head loading and prevent accident by changing the number of revolutions of a spindle motor stepwise during the time until it is increased to the final steady number of revolutions in a magnetic disc. CONSTITUTION:The number of revolutions of a spindle motor 1 is detected in a circuit 2 and is compared 3 with the reference signal from a circuit 4, the result whereof is sent to a motor drive control circuit 5. According to the input of low-high speed switching signal HLS, the circuit 4 outputs the signal corresponding to the number of revolutions f1 up to the time t3 when the low speed region control ends from the power source input time to and outputs the signal corresponding to the number of revolutions f2 after the time t3. Further, according to the changeover of the signal HLS, the circuit 6 supplies the current i2 to the drive switching circuit 7 up to the time t3 and does so after increasing the same to the current i1 after said time. This results in that the motor 1 receives two stages of changes B in the number of revolutions until it attains the steady number of revolutions.
JP6921078A 1978-06-08 1978-06-08 Revolution control system Pending JPS54160216A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6921078A JPS54160216A (en) 1978-06-08 1978-06-08 Revolution control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6921078A JPS54160216A (en) 1978-06-08 1978-06-08 Revolution control system

Publications (1)

Publication Number Publication Date
JPS54160216A true JPS54160216A (en) 1979-12-18

Family

ID=13396122

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6921078A Pending JPS54160216A (en) 1978-06-08 1978-06-08 Revolution control system

Country Status (1)

Country Link
JP (1) JPS54160216A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60185251A (en) * 1984-03-05 1985-09-20 Hitachi Ltd Rotary type storage device
JPS6182375A (en) * 1984-09-29 1986-04-25 Hitachi Ltd Drive system of magnetic disk
JPS6234392A (en) * 1985-08-06 1987-02-14 インタ−ナショナル・ビジネス・マシ−ンズ・コ−ポレ−ション Reduction in friction factor of contact surface between magnetic head and magnetic disc
JPH02198064A (en) * 1989-01-25 1990-08-06 Toshiba Corp Disk drive controller for floppy disk device
WO2002077992A1 (en) * 2001-03-21 2002-10-03 Seagate Technology Llc Multi-phase acceleration of a data storage disc

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60185251A (en) * 1984-03-05 1985-09-20 Hitachi Ltd Rotary type storage device
JPS6182375A (en) * 1984-09-29 1986-04-25 Hitachi Ltd Drive system of magnetic disk
JPH0322669B2 (en) * 1984-09-29 1991-03-27 Hitachi Ltd
JPS6234392A (en) * 1985-08-06 1987-02-14 インタ−ナショナル・ビジネス・マシ−ンズ・コ−ポレ−ション Reduction in friction factor of contact surface between magnetic head and magnetic disc
JPH053068B2 (en) * 1985-08-06 1993-01-13 Intaanashonaru Bijinesu Mashiinzu Corp
JPH02198064A (en) * 1989-01-25 1990-08-06 Toshiba Corp Disk drive controller for floppy disk device
WO2002077992A1 (en) * 2001-03-21 2002-10-03 Seagate Technology Llc Multi-phase acceleration of a data storage disc
GB2389956A (en) * 2001-03-21 2003-12-24 Seagate Technology Llc Multi-phase acceleration of a data storage disc

Similar Documents

Publication Publication Date Title
JPS5220210A (en) Control means for d-c motor
JPS54160216A (en) Revolution control system
JPS52147717A (en) Speed controller for motors
JPS53123830A (en) Control system by current type inverter driver induction motors
JPS5699517A (en) Constant-speed running device for car
JPS5667409A (en) Locating motor driving control system
JPS5316206A (en) System for controlling electric motor vehicle
JPS5345810A (en) System for controlling automotive electric blower
JPS5385012A (en) Dc motor control circuit for electric motor operated vehicle
JPS5760567A (en) Player
JPS5332321A (en) Acceleration and deceleration control system for ac motor
JPS52106512A (en) Electric car control apparatus
JPS528420A (en) Speed control circuit of d.c. motor
JPS5288718A (en) Motor control system
JPS53145014A (en) Motor drive inverter control system
JPS52141906A (en) System for controlling motor-driven fan for vehicles
JPS5622587A (en) Driving method for induction motor
JPS51125843A (en) High speed cut off system
JPS51121723A (en) Controlling device of chopper-controlled electric car
JPS5326012A (en) Motor control means for electric car
JPS5391215A (en) Circuit for controlling vehicle driving motor
JPS526056A (en) Hybrid current counter
JPS52140781A (en) Automatic controller
JPS5517256A (en) Starting system for wound-rotor type induction motor
JPS5288721A (en) Frequency converting system