JPS5683283A - Detecting method and device for rotational frequency of ac motor - Google Patents

Detecting method and device for rotational frequency of ac motor

Info

Publication number
JPS5683283A
JPS5683283A JP15914279A JP15914279A JPS5683283A JP S5683283 A JPS5683283 A JP S5683283A JP 15914279 A JP15914279 A JP 15914279A JP 15914279 A JP15914279 A JP 15914279A JP S5683283 A JPS5683283 A JP S5683283A
Authority
JP
Japan
Prior art keywords
voltage
winding
vector
stator winding
rotational frequency
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
JP15914279A
Other languages
Japanese (ja)
Inventor
Noboru Fujimoto
Noriyoshi Takahashi
Keiji Arai
Toshimi Abukawa
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP15914279A priority Critical patent/JPS5683283A/en
Publication of JPS5683283A publication Critical patent/JPS5683283A/en
Pending 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
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Induction Machinery (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE:To detect an accurate rotational frequency by detecting a vector difference voltage of an induced voltage changing according to a stator winding voltage and a rotor sliding. CONSTITUTION:Phases U, V, W of a three-phase stator winding 1 are given in Y-connection. One end of a detection winding 2 wound at a phase difference theta from U-phase is connected to a neutral point of the stator winding 1. On the other hand, there is provided an intermediate tap on U-phase winding, to which a lead wire 3 is connected. Then, a voltage-rotation converter 4 is mounted between the detection winding 2 and the other end of the lead wire 3. In such a constitution where a voltage vector V is impressed on the stator winding 1, a current vector Is according to a sliding S of a rotor 5 flows in the stator winding 2, a voltage is induced on the detection winding 2 according to its induction operation, a voltage difference DELTA vector V is generated against the lead wire 3, and thus a rotational frequency for which a synchronous rotational frequency at a constant frequency power is standardized can be detected from the voltage difference DELTA vector V.
JP15914279A 1979-12-10 1979-12-10 Detecting method and device for rotational frequency of ac motor Pending JPS5683283A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15914279A JPS5683283A (en) 1979-12-10 1979-12-10 Detecting method and device for rotational frequency of ac motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15914279A JPS5683283A (en) 1979-12-10 1979-12-10 Detecting method and device for rotational frequency of ac motor

Publications (1)

Publication Number Publication Date
JPS5683283A true JPS5683283A (en) 1981-07-07

Family

ID=15687161

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15914279A Pending JPS5683283A (en) 1979-12-10 1979-12-10 Detecting method and device for rotational frequency of ac motor

Country Status (1)

Country Link
JP (1) JPS5683283A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57186192U (en) * 1981-05-21 1982-11-26

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57186192U (en) * 1981-05-21 1982-11-26

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