JPS57206266A - Dc motor - Google Patents

Dc motor

Info

Publication number
JPS57206266A
JPS57206266A JP8956481A JP8956481A JPS57206266A JP S57206266 A JPS57206266 A JP S57206266A JP 8956481 A JP8956481 A JP 8956481A JP 8956481 A JP8956481 A JP 8956481A JP S57206266 A JPS57206266 A JP S57206266A
Authority
JP
Japan
Prior art keywords
torque
facing
motor
constant
current carrying
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
JP8956481A
Other languages
Japanese (ja)
Inventor
Hideo Nishijima
Isao Fukushima
Yasunori Kobori
Seiichi Narishima
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 JP8956481A priority Critical patent/JPS57206266A/en
Publication of JPS57206266A publication Critical patent/JPS57206266A/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 mangetic flux to interlink with a driving coil as constant during the current carrying period, and to reduce ripple of torque of a DC motor by a method wherein notches or holes are provided in a yoke plate to supply constant magnetic flux to the driving coil facing with permanent magnets. CONSTITUTION:Magnetic field to be generated by the permanent magnets of a rotor 1 arranged with N-S poles alternately is made to form a closed magnetic path between the mutually facing yoke plates 5, 7 interposing the coils 2, 3, 4 between them to form the DC motor, while the notches A or the holes are provided in the yoke plate 7 facing the rotor 1 thereof facing to the positions having the maximum interlinking flux density during the current carrying period of the coils 2-4. Accordingly by making the distribution of magnetic flux density to be distorted at the parts thereof, distribution of magnetic flux positioning during the current carrying period in the respective coils 2-4 can be made to approach the constant value, and generated motor torque can be made to approach the constant torque reducing ripple of torque.
JP8956481A 1981-06-12 1981-06-12 Dc motor Pending JPS57206266A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8956481A JPS57206266A (en) 1981-06-12 1981-06-12 Dc motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8956481A JPS57206266A (en) 1981-06-12 1981-06-12 Dc motor

Publications (1)

Publication Number Publication Date
JPS57206266A true JPS57206266A (en) 1982-12-17

Family

ID=13974305

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8956481A Pending JPS57206266A (en) 1981-06-12 1981-06-12 Dc motor

Country Status (1)

Country Link
JP (1) JPS57206266A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0230275U (en) * 1988-08-10 1990-02-26
FR2725569A1 (en) * 1994-10-11 1996-04-12 Aerospatiale BRUSHLESS DIRECT CURRENT ELECTRIC MOTOR WITH LOW TORQUE OVERLOAD

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0230275U (en) * 1988-08-10 1990-02-26
FR2725569A1 (en) * 1994-10-11 1996-04-12 Aerospatiale BRUSHLESS DIRECT CURRENT ELECTRIC MOTOR WITH LOW TORQUE OVERLOAD
EP0707375A1 (en) * 1994-10-11 1996-04-17 AEROSPATIALE Société Nationale Industrielle Brushless DC motor having low torque ripple

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