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US5109184: Direct current motor

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Filing Information

Inventor(s) Itsuki Bahn ·
Assignee(s) Kabushikigaisha Sekogiken ·
Attorney/Agent(s) Staas & Halsey ·
Primary Examiner Stanley J. Witkowski ·
Assistant Examiner Wysocki; A. Jonathan ·
Application Number US7474096
Filing date 05/09/1990
PCT 371 date 05/09/1990
Issue date 04/28/1992
Predicted expiration date 05/09/2010
U.S. Classifications 318/254  · 318/280  ·
International Classifications H02K 4100  ·
Kind CodeA
International Classifications 318135;138;139;254;254 A;444;439;647;671;280-286 ·
PCT Application Number PCTJP8900933 - 09/12/1989
PCT Publication Number WO199002727 - 03/22/1990
Foreign Priority JP63226514 - 09/12/1988 ·
16 Claims, No Drawings


Abstract

A small and inexpensive 3-phase Y-connection direct current motor operable at high speeds with high efficiency. The motor includes a current supply controlling circuit that receives first to third position detection signals from a position detection device having three Hall elements for detecting the position of a rotor, and fourth to sixth position detection signals supplied from the device [and having .currents to the armature coils of respective phases in the forward and reverse directions. When the current supply to one of the armature coils is interrupted at the end of a corresponding position detection signal, magnetic energy stored in the armature coil is supplied to another armature coil which is to be supplied with current by a next position detection signal, thereby rapidly extinguishing the magnetic energy and causing the current supply width required for the armature current to rise to a preset value to an extremely small width so as to eliminate the reduced-torque in the initial stage of the current supply and the countertorque in the end stage of the current supply.

Independent Claims | See all claims (16)

  1. 1. A direct current motor, comprising:a position detection device for sequentially supplying a plurality of position detection signals, corresponding in number to phases of a direct current motor and associated with the respective phases of the direct current motor, in dependence on a rotation position of a rotor of the direct current motor;a current supply controlling circuit connectable to a direct current power source, for sequentially supply currents to armature coils of respective phases in response to the position detection signals;circuit means for supplying a magnetic energy stored in one of said armature coils which is interrupted to be supplied with current into a next one of said armature coils which is to be next supplied with current a the time of interruption of current supply to the armature coil of the respective phase, thereby rapidly extinguishing the stored magnetic energy and rapidly raising an armature current flowing in the armature coil to be next supplied with current; andtransistor bridge circuits respectively connected to the armature coils of the respective phases for turning on and off each of the transistors constituting said transistor bridge circuits in response to a corresponding position detection signals.
  2. 2. A direct current motor comprising:a position detection device for sequentially supplying a first position detection signal group including a plurality of position detection signals corresponding in number to phases of a direct current motor and associated with respective phases of the direct current motor and a second position detection signal group including a plurality of position detection signals with preset phases differences with respect to the corresponding position detection signals of the first position detection signal group, in dependence on a rotation position of a rotor of the direct current motor:a current supply controlling circuit connectable to a direct current power source, for sequentially supply currents to armature coils of respective phases in a forward direction in response to the first position detection signal group, and for sequentially supplying currents to the armature coils of respective phases in reverse direction in response to the second position detection signal group; andcircuit means for supplying a magnetic energy stored in one of said armature coils which is interrupted to be supplied with current into a next one of said armature coils which is to be next supplied with current at the time of interruption of current supply to the armature coil of the respective phase, thereby rapidly extinguishing the stored magnetic energy and rapidly raising an armature current flowing in the armature coil to be next supplied with current.
  3. 9. A 3-phase Y-connection direct current motor, comprising:a position detection device, including three position detection elements which are separated from one another by an electrical angle of 120 degrees, for detecting a position of a magnet rotor and for generating a first position detection signal group including a plurality of position detection signals each of which has an electrical angle of 120 degrees and which are sequentially and successively generated without being superposed on one another in time, and a second position detection signal group including a plurality of position detection signals each having a phase difference of an electrical angle of 60 degrees with respect to a corresponding one of said respective position detection signals;first, second and third transistor bridge circuits for respectively supplying currents to armature coils of the first-phase, second-phase and third-phase in the forward and reverse directions;a direct current power sourcer for supplying electric power to said first, second and third transistor bridge circuits;a current supply controlling circuit for sequentially and cyclically energizing transistors of said first, second and third transistor bridge circuits in response to the first position detection signal group so as to supply currents to said armature coils of respective phases in the forward direction and for sequentially and cyclically energizing the transistors of said first, second and third transistor bridge circuits in response to the second position detection signal group so as to supply currents to said armature coils of respective phases in the reverse direction, thereby generating an output torque exerting in one direction;first and second diodes for prevention of reverse current flow, respectively connected in a forward direction between said direct current power source and the armature coils of the respective phases; andan electric circuit for preventing, by use of said first and second diodes, magnetic energy stored in one of said armature coils from being returned, via a diode juxtaposed with said transistor, to a positive terminal of said direct current power source when said one armature coil is interrupted to be supplied with current at the end of the respective position detection signal, so that the magnetic energy is supplied to one of said armature coils which is to be supplied with current in response to a next position detection signal to thereby rapidly extinguish the magnetic energy, and for causing a current supply width, required for the armature current to rise to a preset value, to an extremely small width at initial portions of the current supply due to the magnetic energy discharge and of the position detection signal, so that a reduced-torque at an initial stage of the current supply and a countertorque at end stage of the current supply;wherein said position detection elements are fixed on a fixed armature side so that a range in which currents are supplied to said armature coils in response to the position detection signals is consistent with a maximum torque generation range.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US4446406 Sony Corporation Uzuka May 1984
US4508998 David H. Rush Hahn Apr 1985
US4563622 Rotron Incorporated Deavers et al. Jan 1986
US4645991 BAN ITSUKI Ban et al. Feb 1987
US4743813 Mavilor Systemes S.A. Tassinario May 1988
US4958115 AT&T Bell Laboratories Miller Sep 1990

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