JPS5492363A - Control circuit of step motor for watches - Google Patents

Control circuit of step motor for watches

Info

Publication number
JPS5492363A
JPS5492363A JP15929477A JP15929477A JPS5492363A JP S5492363 A JPS5492363 A JP S5492363A JP 15929477 A JP15929477 A JP 15929477A JP 15929477 A JP15929477 A JP 15929477A JP S5492363 A JPS5492363 A JP S5492363A
Authority
JP
Japan
Prior art keywords
step motor
motor
resistance
detecting
occurrence
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
JP15929477A
Other languages
Japanese (ja)
Inventor
Yasuhiro Fukushima
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.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
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 Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP15929477A priority Critical patent/JPS5492363A/en
Publication of JPS5492363A publication Critical patent/JPS5492363A/en
Pending legal-status Critical Current

Links

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

Landscapes

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

Abstract

PURPOSE:To prevent the occurrence of torque loss at the starting and drive the step motor stably by temporarily shorting a motor current detecting resistance via semiconductor active element at the drive inputting. CONSTITUTION:When a control pulse of a short width is applied from a frequency divider 2 via AND gate 3, a parallel connected semiconductor active element 7 goes ON during the pulse period of the control pulse. This causes the resistance 8 for detecting the current flowing in a step motor M to be shorted temporarily. Hence, the occurrence of torque loss at the starting of the motor M is prevented and the step motor may be stably driven. In addition, this enables the resistance value for the detecting resistance to be increased, thus the current flowing in the motor driving circuit is detected with high accuracy.
JP15929477A 1977-12-29 1977-12-29 Control circuit of step motor for watches Pending JPS5492363A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15929477A JPS5492363A (en) 1977-12-29 1977-12-29 Control circuit of step motor for watches

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15929477A JPS5492363A (en) 1977-12-29 1977-12-29 Control circuit of step motor for watches

Publications (1)

Publication Number Publication Date
JPS5492363A true JPS5492363A (en) 1979-07-21

Family

ID=15690640

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15929477A Pending JPS5492363A (en) 1977-12-29 1977-12-29 Control circuit of step motor for watches

Country Status (1)

Country Link
JP (1) JPS5492363A (en)

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