JPS5735757A - Detector for revolving speed of motor - Google Patents

Detector for revolving speed of motor

Info

Publication number
JPS5735757A
JPS5735757A JP11103880A JP11103880A JPS5735757A JP S5735757 A JPS5735757 A JP S5735757A JP 11103880 A JP11103880 A JP 11103880A JP 11103880 A JP11103880 A JP 11103880A JP S5735757 A JPS5735757 A JP S5735757A
Authority
JP
Japan
Prior art keywords
speed
driving magnetic
magnetized
magnetic pole
waveform
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
JP11103880A
Other languages
Japanese (ja)
Inventor
Hirotoshi Ono
Yukihiro Kineshima
Makoto Iwahara
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.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan 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 Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP11103880A priority Critical patent/JPS5735757A/en
Publication of JPS5735757A publication Critical patent/JPS5735757A/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
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets

Abstract

PURPOSE:To get rid of influence of a driving magnetic pole to a speed detection winding, by constituting the driving magnetic pole of a magentized waveform whose higher harmonic is a little, in a revolving speed detector of a motor. CONSTITUTION:A rotor 5 has a magnet 7 of a ring shape, and the lower surface of this magnet is radially magnetized to N and S poles alternately. The outside of driving magnetic polse 8N, 8S is magnetized by speed detecting magnetic poles 9N, 9S. A stator 10 consists of a disk-like body having almost the same diameter as that of the rotor 5, and on its upper surface is laid a speed detecting coil 11 which has the same pitch as that of the speed detecting magnetic poles 9N, 9S, and has been bent to a tooth shape. A magnetized waveform of the driving magnetic pole is usually a trapezoidal wave, and the magnetized waveform suddenly rises and falls at the boundary of 8N and 8S, therefore, at this time, a differential signal contains a single peak pulse, and exerts a bad influence on detection of speed. Therefore, the differential signal is made a cosine wave by magnetizing the driving magnetic pole to a sine waveform, so as not to exert influence on detection of speed.
JP11103880A 1980-08-14 1980-08-14 Detector for revolving speed of motor Pending JPS5735757A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11103880A JPS5735757A (en) 1980-08-14 1980-08-14 Detector for revolving speed of motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11103880A JPS5735757A (en) 1980-08-14 1980-08-14 Detector for revolving speed of motor

Publications (1)

Publication Number Publication Date
JPS5735757A true JPS5735757A (en) 1982-02-26

Family

ID=14550825

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11103880A Pending JPS5735757A (en) 1980-08-14 1980-08-14 Detector for revolving speed of motor

Country Status (1)

Country Link
JP (1) JPS5735757A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6429772A (en) * 1987-07-27 1989-01-31 Nec Corp Pulse generator for motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6429772A (en) * 1987-07-27 1989-01-31 Nec Corp Pulse generator for motor

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