JPS55111689A - Brushless dc motor - Google Patents

Brushless dc motor

Info

Publication number
JPS55111689A
JPS55111689A JP1801079A JP1801079A JPS55111689A JP S55111689 A JPS55111689 A JP S55111689A JP 1801079 A JP1801079 A JP 1801079A JP 1801079 A JP1801079 A JP 1801079A JP S55111689 A JPS55111689 A JP S55111689A
Authority
JP
Japan
Prior art keywords
brushless
rotor
motor
waveform
information
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.)
Granted
Application number
JP1801079A
Other languages
Japanese (ja)
Other versions
JPS624954B2 (en
Inventor
Hiroyuki Yamauchi
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP1801079A priority Critical patent/JPS55111689A/en
Publication of JPS55111689A publication Critical patent/JPS55111689A/en
Publication of JPS624954B2 publication Critical patent/JPS624954B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE:To provide a drive current having desired accurate waveform in a brushless DC motor by encoding the drive signal waveform information to digital code, storing the digital code on the entire periphery of the rotor, and reading it by a detector to form a drive signal. CONSTITUTION:A magnetic coating layer 17 is formed on the entire side periphery of the outer periphery of a rotor yoke 3 of a brushless DC motor, magnetic tracks are formed to record drive current waveform information through a magnetic head at the layer 17 to store the information thereon. Multi-track heads 18, 19 are arranged at the position where their electric angles are different at 90 deg. each other as an element for reading the waveform information. The signals picked up by the heads 18, 19 are supplied through limiter amplifiers 20, 21, comparators 22, 23 and flip-flops 24, 25 to stator coils 4, 5. Accordingly, accurate waveform signal can be readily obtained to provide constant rotary torque regardless of the rotational angle position of the rotor.
JP1801079A 1979-02-19 1979-02-19 Brushless dc motor Granted JPS55111689A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1801079A JPS55111689A (en) 1979-02-19 1979-02-19 Brushless dc motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1801079A JPS55111689A (en) 1979-02-19 1979-02-19 Brushless dc motor

Publications (2)

Publication Number Publication Date
JPS55111689A true JPS55111689A (en) 1980-08-28
JPS624954B2 JPS624954B2 (en) 1987-02-02

Family

ID=11959699

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1801079A Granted JPS55111689A (en) 1979-02-19 1979-02-19 Brushless dc motor

Country Status (1)

Country Link
JP (1) JPS55111689A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57183206A (en) * 1981-04-21 1982-11-11 Siemens Ag Pole position detector in linear motor for vehicle running in restriction by truck
JPS5812589A (en) * 1981-07-10 1983-01-24 Nippon Telegr & Teleph Corp <Ntt> Drive device for brushless motor
US4568862A (en) * 1983-04-15 1986-02-04 Mavilor Systemes, S.A. Commutatorless d.c. motor with electronic commutation
US4584505A (en) * 1984-06-14 1986-04-22 Yeongchoon Chung Torque-speed control system for asynchronous D.C. brushless motor
US5013988A (en) * 1987-10-29 1991-05-07 Fanuc Ltd Absolute position encoder
KR100319138B1 (en) * 2000-01-06 2002-01-04 구자홍 Fault correction circuit of 3-phase brushless DC motor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS555010A (en) * 1978-06-23 1980-01-14 Nippon Telegr & Teleph Corp <Ntt> Method of driving brushless motor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS555010A (en) * 1978-06-23 1980-01-14 Nippon Telegr & Teleph Corp <Ntt> Method of driving brushless motor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57183206A (en) * 1981-04-21 1982-11-11 Siemens Ag Pole position detector in linear motor for vehicle running in restriction by truck
JPS5812589A (en) * 1981-07-10 1983-01-24 Nippon Telegr & Teleph Corp <Ntt> Drive device for brushless motor
US4568862A (en) * 1983-04-15 1986-02-04 Mavilor Systemes, S.A. Commutatorless d.c. motor with electronic commutation
US4584505A (en) * 1984-06-14 1986-04-22 Yeongchoon Chung Torque-speed control system for asynchronous D.C. brushless motor
US5013988A (en) * 1987-10-29 1991-05-07 Fanuc Ltd Absolute position encoder
KR100319138B1 (en) * 2000-01-06 2002-01-04 구자홍 Fault correction circuit of 3-phase brushless DC motor

Also Published As

Publication number Publication date
JPS624954B2 (en) 1987-02-02

Similar Documents

Publication Publication Date Title
US3663877A (en) Brushless dc motor including tachometer commutation circuit
JPS55111689A (en) Brushless dc motor
US4361856A (en) Video tape recorder
KR900016994A (en) Portable VTR
GB2188720A (en) Improved position control system
JPH0350965B2 (en)
US5679990A (en) Motor
JPS58207887A (en) Capacitive sensor type motor control system
JPS6246811B2 (en)
JPS6197518A (en) Magnetic drum for magnetic type rotary encoder
US6921999B1 (en) Electric motor
JP3233317B2 (en) Magnetic encoder
KR900001855Y1 (en) Brushless motor
JPS5671489A (en) Brushless dc motor
JP2730445B2 (en) Magnetic disk drive
JP3181590B2 (en) Recorder with drive phase detector
SU1610494A1 (en) Rotary head unit of video tape recorder
SU798943A1 (en) Shaft angular position-to-code converter
JPS6197515A (en) Magnetic recording type rotor encoder
JPS59189500A (en) Magnetic type rotary encoder
JPS6117567Y2 (en)
JPS6325900Y2 (en)
JPS639264Y2 (en)
JPS6392251A (en) Brushless motor of thin type
JPS6235357B2 (en)