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JPS57206267A - Dc motor - Google Patents

Dc motor

Info

Publication number
JPS57206267A
JPS57206267A JP8956581A JP8956581A JPS57206267A JP S57206267 A JPS57206267 A JP S57206267A JP 8956581 A JP8956581 A JP 8956581A JP 8956581 A JP8956581 A JP 8956581A JP S57206267 A JPS57206267 A JP S57206267A
Authority
JP
Japan
Prior art keywords
magnetic flux
torque
motor
approach
rotor
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
JP8956581A
Other languages
Japanese (ja)
Inventor
Isao Fukushima
Hideo Nishijima
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 JP8956581A priority Critical patent/JPS57206267A/en
Publication of JPS57206267A publication Critical patent/JPS57206267A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

PURPOSE:To make variation of interlinking magnetic flux of magnets with driving coils to approach the rectangular wave, and to reduce ripple of torque of a DC motor by a method wherein the non-magnetized parts or the magnetized parts in reverse polarity are provided in respective poles of the magnets for a rotor magnetized in multipolarity. CONSTITUTION:Magnetic field to be generated by the permanent magnets of the rotor 1 arranged with N-S poles alternately is made to form a closed magnetic path between mutually facing yoke plates 5, 7 interposing coils 2, 3, 4 between them to form the DC motor, while the non-magnetized parts 0 are provided or the magnetized parts in reverse polarity of the part thereof are provided at the mechanical positions of the respective poles of the permanent magnet to form the maximum magnetic flux of the rotor 1 thereof. Accordingly variation of magnetic flux to be generated according to rotation can be made to approach the rectangular wave as shown with the wave form 13 reducing the maximum value of magnetic flux, generated torque of the motor can be made to approach the constant torque reducing ripple of torque, and frequency of ripple thereof can be made higher.
JP8956581A 1981-06-12 1981-06-12 Dc motor Pending JPS57206267A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8956581A JPS57206267A (en) 1981-06-12 1981-06-12 Dc motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8956581A JPS57206267A (en) 1981-06-12 1981-06-12 Dc motor

Publications (1)

Publication Number Publication Date
JPS57206267A true JPS57206267A (en) 1982-12-17

Family

ID=13974331

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8956581A Pending JPS57206267A (en) 1981-06-12 1981-06-12 Dc motor

Country Status (1)

Country Link
JP (1) JPS57206267A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6046760A (en) * 1983-08-23 1985-03-13 Canon Inc Motor
JPS6188755A (en) * 1984-10-05 1986-05-07 Sony Corp Three phase brushless motor
JPS6192150A (en) * 1984-10-08 1986-05-10 Matsushita Electric Ind Co Ltd Brushless dc motor
JPS63257447A (en) * 1987-04-14 1988-10-25 Canon Inc 3-phase brushless motor
JPH01185156A (en) * 1988-01-12 1989-07-24 Canon Inc Stepping motor
US6713923B2 (en) * 2001-08-03 2004-03-30 Yamaha Hatsudoki Kabushiki Kaisha Orientation device and magnetization device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6046760A (en) * 1983-08-23 1985-03-13 Canon Inc Motor
JPS6188755A (en) * 1984-10-05 1986-05-07 Sony Corp Three phase brushless motor
JPS6192150A (en) * 1984-10-08 1986-05-10 Matsushita Electric Ind Co Ltd Brushless dc motor
JPS63257447A (en) * 1987-04-14 1988-10-25 Canon Inc 3-phase brushless motor
JPH01185156A (en) * 1988-01-12 1989-07-24 Canon Inc Stepping motor
US6713923B2 (en) * 2001-08-03 2004-03-30 Yamaha Hatsudoki Kabushiki Kaisha Orientation device and magnetization device

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