JPS57142563A - Rotating speed detection circuit for brushless motor - Google Patents

Rotating speed detection circuit for brushless motor

Info

Publication number
JPS57142563A
JPS57142563A JP56029126A JP2912681A JPS57142563A JP S57142563 A JPS57142563 A JP S57142563A JP 56029126 A JP56029126 A JP 56029126A JP 2912681 A JP2912681 A JP 2912681A JP S57142563 A JPS57142563 A JP S57142563A
Authority
JP
Japan
Prior art keywords
voltage
brushless motor
potential
armature coils
coil
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
JP56029126A
Other languages
Japanese (ja)
Inventor
Akira Torisawa
Tatsuya Yanai
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 JP56029126A priority Critical patent/JPS57142563A/en
Publication of JPS57142563A publication Critical patent/JPS57142563A/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
    • G01P3/46—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring amplitude of generated current or voltage

Abstract

PURPOSE:To sense correct rotor rotating speed signal with a simple constitution by taking out starting voltage from the middle point of the star-connected armature coils of a brushless motor. CONSTITUTION:Armature coils 1a-1c are star-connected for a 3-phase brushless motor. The driving circuit 5 senses rotational position of the permanent magnet rotor with a Hall element, driving current is commutated by changing over successively through each coil of the tester. The potential VN at the neutral point of start-connected armature coils is the sum of the inverse electro-motive force of the coil on the earth side and the voltage drop developed in a winding coil by the above mentioned commuted current. The potential VN, therefore, changes for each change-over interval, and the potential VN of the neutral point has amplitude with the center at 1/2 of the voltage of the power source. The amplitude is proportional to the speed, and its wave shape repeats itself 6 times for one rotor rotation, and the voltage is compared with the 1/2 of the electric source voltage to issue speed signal at a comparator 3. Next, at the control circuit 4, difference from the target value is detected to control speed.
JP56029126A 1981-02-27 1981-02-27 Rotating speed detection circuit for brushless motor Pending JPS57142563A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56029126A JPS57142563A (en) 1981-02-27 1981-02-27 Rotating speed detection circuit for brushless motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56029126A JPS57142563A (en) 1981-02-27 1981-02-27 Rotating speed detection circuit for brushless motor

Publications (1)

Publication Number Publication Date
JPS57142563A true JPS57142563A (en) 1982-09-03

Family

ID=12267602

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56029126A Pending JPS57142563A (en) 1981-02-27 1981-02-27 Rotating speed detection circuit for brushless motor

Country Status (1)

Country Link
JP (1) JPS57142563A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04248393A (en) * 1991-01-21 1992-09-03 Sankyo Seiki Mfg Co Ltd Driving circuit for brushless motor
JPH06307719A (en) * 1993-04-23 1994-11-01 Toshiba Corp Controlling method for start-up of compressor in air conditioner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04248393A (en) * 1991-01-21 1992-09-03 Sankyo Seiki Mfg Co Ltd Driving circuit for brushless motor
JPH06307719A (en) * 1993-04-23 1994-11-01 Toshiba Corp Controlling method for start-up of compressor in air conditioner

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