CH671135GA3 - Control method for stepper motor - using magnetic field detector allowing compensation for ambient magnetic field by adjusting drive pulses - Google Patents

Control method for stepper motor - using magnetic field detector allowing compensation for ambient magnetic field by adjusting drive pulses Download PDF

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Publication number
CH671135GA3
CH671135GA3 CH485987A CH485987A CH671135GA3 CH 671135G A3 CH671135G A3 CH 671135GA3 CH 485987 A CH485987 A CH 485987A CH 485987 A CH485987 A CH 485987A CH 671135G A3 CH671135G A3 CH 671135GA3
Authority
CH
Switzerland
Prior art keywords
magnetic field
pulses
threshold
control method
stepper motor
Prior art date
Application number
CH485987A
Other languages
French (fr)
Other versions
CH671135B5 (en
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 filed Critical
Priority to CH485987A priority Critical patent/CH671135GA3/en
Publication of CH671135GA3 publication Critical patent/CH671135GA3/en
Publication of CH671135B5 publication Critical patent/CH671135B5/fr

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/14—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor
    • G04C3/143—Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g. detection of unwanted or missing step

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Stepping Motors (AREA)
  • Electromechanical Clocks (AREA)

Abstract

The stepping motor for control of an analogue type display uses a series of pulses whose form may vary according to external conditions. The ambient magnetic field is detected, and its value is compared with a number of threshold values. If the value is between the first two threshold levels, the rate at which pulses are cut may be modified. When the value lies between a second pair of thresdhold values the pulses may become full pulses. Above the third threshold, the duration of the pulses may be augmented, and above a fourth threshold, the motor may be momentarily stopped, and recovery pulses transmitted. USE - Controlled stepping motor e.g. for watch. Compensates for external magnetic fields, and minimise need for magnetic screening.
CH485987A 1987-12-11 1987-12-11 Control method for stepper motor - using magnetic field detector allowing compensation for ambient magnetic field by adjusting drive pulses CH671135GA3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH485987A CH671135GA3 (en) 1987-12-11 1987-12-11 Control method for stepper motor - using magnetic field detector allowing compensation for ambient magnetic field by adjusting drive pulses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH485987A CH671135GA3 (en) 1987-12-11 1987-12-11 Control method for stepper motor - using magnetic field detector allowing compensation for ambient magnetic field by adjusting drive pulses

Publications (2)

Publication Number Publication Date
CH671135GA3 true CH671135GA3 (en) 1989-08-15
CH671135B5 CH671135B5 (en) 1990-02-15

Family

ID=4283797

Family Applications (1)

Application Number Title Priority Date Filing Date
CH485987A CH671135GA3 (en) 1987-12-11 1987-12-11 Control method for stepper motor - using magnetic field detector allowing compensation for ambient magnetic field by adjusting drive pulses

Country Status (1)

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CH (1) CH671135GA3 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2745052A1 (en) * 1976-10-06 1978-04-20 Suwa Seikosha Kk ELECTRONIC CLOCK
GB2006995A (en) * 1977-09-26 1979-05-10 Citizen Watch Co Ltd Drive system for pulse motor
FR2426999A1 (en) * 1978-05-26 1979-12-21 Seiko Instr & Electronics EXTERNAL MAGNETIC FIELD DETECTION DEVICE FOR AN ELECTRONIC WATCH
FR2445653A1 (en) * 1978-12-25 1980-07-25 Seiko Instr & Electronics DETECTION DEVICE FOR AN ELECTRONIC WATCH
GB2054916A (en) * 1979-07-13 1981-02-18 Seiko Instr & Electronics Electronic timepiece
GB2134290A (en) * 1982-12-16 1984-08-08 Suwa Seikosha Kk An analog electronic timepiece
EP0221648A1 (en) * 1985-09-09 1987-05-13 Seiko Instruments Inc. Electronic analog timepiece with DC magnetic field detector

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2745052A1 (en) * 1976-10-06 1978-04-20 Suwa Seikosha Kk ELECTRONIC CLOCK
GB2006995A (en) * 1977-09-26 1979-05-10 Citizen Watch Co Ltd Drive system for pulse motor
FR2426999A1 (en) * 1978-05-26 1979-12-21 Seiko Instr & Electronics EXTERNAL MAGNETIC FIELD DETECTION DEVICE FOR AN ELECTRONIC WATCH
FR2445653A1 (en) * 1978-12-25 1980-07-25 Seiko Instr & Electronics DETECTION DEVICE FOR AN ELECTRONIC WATCH
GB2054916A (en) * 1979-07-13 1981-02-18 Seiko Instr & Electronics Electronic timepiece
GB2134290A (en) * 1982-12-16 1984-08-08 Suwa Seikosha Kk An analog electronic timepiece
EP0221648A1 (en) * 1985-09-09 1987-05-13 Seiko Instruments Inc. Electronic analog timepiece with DC magnetic field detector

Also Published As

Publication number Publication date
CH671135B5 (en) 1990-02-15

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