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公开(公告)号：CA1288461C
公开(公告)日：1991-09-03
申请号：CA561043
申请日：1988-03-10
Applicant: SONY CORP
Inventor： SAOTOME TOSHIO , NOGUCHI YOSHIYUKI , NISHIKAWA MITSUO , YAMAZAKI SHIGEKI
Abstract: A flat type DC motor applicable for disc drive of an electronic still camera in which vibrations of the rotor axle are prevented without increasing manufacturing costs by providing the magnetic field between the stator and rotor to be asymmetrical so that the magnetic attracting force of the rotor to the stator is also asymmetrical. The asymmetrical attracting force causes the axle of the rotor to be urged in the same radial direction relative to the axle bearing in the stator, thus, movements of the axle in radial directions in the clearance between the axle and bearing of the stator are eliminated and the rotor rotates without vibrating.
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公开(公告)号：GB2202387B
公开(公告)日：1991-05-22
申请号：GB8805626
申请日：1988-03-09
Applicant: SONY CORP
Inventor： SAOTOME TOSHIO , NOGUCHI YOSHIYUKI , NISHIKAWA MITSUO , YAMAZAKI SHIGEKI
Abstract: A flat type DC motor applicable for disc drive of an electronic still camera in which vibrations of the rotor axle are prevented without increasing manufacturing costs by providing the magnetic field between the stator and rotor to by asymmetrical so that the magnetic attracting force of the rotor to the stator is also asymmetrical. The asymmetrical attracting force causes the axle of the rotor to be urged in the same radial direction relative to the axle bearing in the stator, thus, movements of the axle in radial directions in the clearance between the axle and bearing of the stator are eliminated and the rotor rotates without vibrating.
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公开(公告)号：FR2612701A1
公开(公告)日：1988-09-23
申请号：FR8803230
申请日：1988-03-11
Applicant: SONY CORP
Inventor： SAOTOME TOSHIO , NOGUCHI YOSHIYUKI , NISHIKAWA MITSUO , YAMAZAKI SHIGEKI
Abstract: A flat type DC motor applicable for disc drive of an electronic still camera in which vibrations of the rotor axle are prevented without increasing manufacturing costs by providing the magnetic field between the stator and rotor to by asymmetrical so that the magnetic attracting force of the rotor to the stator is also asymmetrical. The asymmetrical attracting force causes the axle of the rotor to be urged in the same radial direction relative to the axle bearing in the stator, thus, movements of the axle in radial directions in the clearance between the axle and bearing of the stator are eliminated and the rotor rotates without vibrating.
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公开(公告)号：DE3808222A1
公开(公告)日：1988-09-22
申请号：DE3808222
申请日：1988-03-11
Applicant: SONY CORP
Inventor： SAOTOME TOSHIO , NOGUCHI YOSHIYUKI , NISHIKAWA MITSUO , YAMAZAKI SHIGEKI
Abstract: A flat type DC motor applicable for disc drive of an electronic still camera in which vibrations of the rotor axle are prevented without increasing manufacturing costs by providing the magnetic field between the stator and rotor to by asymmetrical so that the magnetic attracting force of the rotor to the stator is also asymmetrical. The asymmetrical attracting force causes the axle of the rotor to be urged in the same radial direction relative to the axle bearing in the stator, thus, movements of the axle in radial directions in the clearance between the axle and bearing of the stator are eliminated and the rotor rotates without vibrating.
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公开(公告)号：GB2202387A
公开(公告)日：1988-09-21
申请号：GB8805626
申请日：1988-03-09
Applicant: SONY CORP
Inventor： SAOTOME TOSHIO , NOGUCHI YOSHIYUKI , NISHIKAWA MITSUO , YAMAZAKI SHIGEKI
Abstract: A flat type DC motor applicable for disc drive of an electronic still camera in which vibrations of the rotor axle are prevented without increasing manufacturing costs by providing the magnetic field between the stator and rotor to by asymmetrical so that the magnetic attracting force of the rotor to the stator is also asymmetrical. The asymmetrical attracting force causes the axle of the rotor to be urged in the same radial direction relative to the axle bearing in the stator, thus, movements of the axle in radial directions in the clearance between the axle and bearing of the stator are eliminated and the rotor rotates without vibrating.
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Patent Agency Ranking
公开(公告)号：JPH04251535A
公开(公告)日：1992-09-07
申请号：JP41606090
申请日：1990-12-29
Applicant: SONY CORP
Inventor： KITAGAWA KOJI , MIZUSAWA TAKU , NISHIKAWA MITSUO , SAOTOME TOSHIO
Abstract: PURPOSE:To make a brushless motor rotate smoothly with a high torque, by providing a first magnetized layer for rotational driving, and by providing a second and third magnetized layer for removing the distortional components of the changing waveshape of a magnetic field. CONSTITUTION:By subjecting a first magnetized layer 28A to a strong saturated magnetization, a square wave-like magnetic field pattern is formed. Thereby, a rotational driving torque is increased. The magnetized patterns in a second and third magnetized layer 28B, 28C are so preset that the synthesized magnetic field in a sensing means 17 for the three magnetized layers 28A, 28B, 28C is made sinusoidal. Thereby, a stable rotating signal of no distortion can be obtained in the sensing means 17. A stator core 15 so provided as to face the first magnetized layer 28A, is made to receive no effect from the second and third magnetized layer 28B, 28C. Thereby, a rotor part can be rotated more smoothly.
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公开(公告)号：JPH06284675A
公开(公告)日：1994-10-07
申请号：JP8810093
申请日：1993-03-23
Applicant: SONY CORP
Inventor： SAOTOME TOSHIO , NANAE YUUICHI
IPC: H02K37/14
Abstract: PURPOSE:To provide a stepping motor which is provided with a relatively large space and can be constituted in a thin type with high accuracy. CONSTITUTION:This stepping motor 10 is so constituted of a rotor 13 as to include at least one pair of flat annular pole tooth yokes 12a, 12b, 12c, 12d with pole teeth extending toward the inside thereof, annular plane coils 17, 18 respectively provided between each pair of tooth yokes and flat plate-like magnets provided at the center of the pole tooth yokes and magnetized with multi-polarities in the circumferential direction.
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公开(公告)号：JPH06261530A
公开(公告)日：1994-09-16
申请号：JP4411793
申请日：1993-03-04
Applicant: SONY CORP
Inventor： KOBAYASHI YUKIHIRO , SAOTOME TOSHIO
Abstract: PURPOSE:To make a PM type stepping motor flat and, at the same time, to reduce the cost of the motor. CONSTITUTION:Tapless coils 17 are arranged at appropriate angles around a rotor magnet 11. Each tapless coil 17 is connected in series at every stator yokes 14a and 14b and, as a result, the yoke 14a side becomes A-phase or inverse-of-A-phase and the yoke 14b side becomes B-phase or inverse-of-B-phase. Each yoke 14a and 14b is provided with poles 22 corresponding to the tapless coils 17. When the exciting currents of the yokes 14a and 14b are switched, the rotor magnet 11 is rotated, since magnetic poles generated in the poles 22 are switched. The tapless coils 11 which are inexpensive as compared with the conventional exciting coil are arranged in the same plane in this stepping motor and the assembling accuracy of the motor 1 can be lowered. Therefore, the motor can be flattened and the cost of the motor can be reduced.
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公开(公告)号：JPH06245474A
公开(公告)日：1994-09-02
申请号：JP5648593
申请日：1993-02-22
Applicant: SONY CORP , HOEI DENKI KENKYUSHO KK
Inventor： SAOTOME TOSHIO , ITO OSAMU , TOYONAGA KIYOHIDE
IPC: H02K37/14
Abstract: PURPOSE:To provide a method for manufacturing a pole tooth yoke of a stepping motor wherein the length and the shape of pole teeth can be set at any size. CONSTITUTION:Pole teeth 12 are punched from one side of a straight reference line 14 of a flat metal plate 13 and flanges 15 are punched from the other side of the line so that the pole teeth and the flanges may be formed alternately. Along a bending line 16 on the flange side of the reference line, the pole tooth 12 are bent so as to erect and the flanges 15 are curled in a plane so that a bending line may be a circle.
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公开(公告)号：JPH06335224A
公开(公告)日：1994-12-02
申请号：JP14151293
申请日：1993-05-20
Applicant: SONY CORP
Inventor： SAOTOME TOSHIO , ITO OSAMU
IPC: H02K37/14
Abstract: PURPOSE:To obtain a stepping motor with an improved rotary accuracy and a large generation torque regardless of a motor outer diameter by providing a rotor magnet with an outer diameter which is slightly smaller than the inner diameter of a case where a pole tooth yoke is formed. CONSTITUTION:A rotor magnet 4 has an outer diameter which is slightly smaller than the inner diameter of a pole gear yoke 3 and is housed in the pole tooth yoke 3 and a driving current is given from a drive circuit where a substrate 7 is formed to a coil 8 in a stepping motor 1, thus forming a magnetic circuit reaching a pole tooth 27 again from the inside of the pole gear yoke 3 through the coil 8, a tie board 41, and a frame body 22 after passing through the pole tooth 27 and the substrate 7. Then, the rotor 5 is rotated due to the operation of the magnetic field where the magnetic circuit and the rotor magnet 4 are formed and then the rotary shaft 5 is subjected to a drive of rotation but the stepping motor 1 can be driven to rotate accurately since each pole tooth is positioned accurately and at the same time a high torque can be generated since the size of the magnet can be increased.
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