Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-01-31
2001-04-10
Mullins, Burton (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S06700R, C310S090000, C310S254100, C310SDIG006, C029S596000
Reexamination Certificate
active
06215210
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a motor, and in particular, relates to a structure of a stator thereof comprising a magnetic plate and a printed circuit board stacked together by calking and an assembly method of the stator.
2. Description of the Related Art
Presently, in a tape recorder and a video tape recorder, a capstan shaft is used in a combination of a pinch roller to transport a magnetic tape at a constant speed. The capstan shaft is driven at a constant speed by a motor. Recently, a direct drive method is employed, wherein the capstan shaft is directly connected to a rotor of a capstan motor.
In such a capstan motor as employing the direct drive method, the capstan motor generally comprises a rotor and a stator. The stator comprises a stator substrate having a magnetic plate made of a zinc steel sheet and a printed circuit board stacked together by calking, a bearing holder for rotatably supporting the capstan shaft through bearings and a stator core having windings and forming magnetic circuits, wherein the the stator core and the bearing holder are fixed to the stator substrate. The capstan shaft is integrally fixed to the rotor thereof.
SUMMARY OF THE INVENTION
Accordingly, a general object of the present invention is to provide a motor, a method of installing the motor, a structure of a stator of the motor and an assembly method of the stator.
A specific object of the present invention is to provide a stator structure of a motor, the stator structure comprising a stator substrate having a double-layer structure of a printed circuit board and a magnetic plate jointed together at a plurality of calking sections, wherein a centroid is determined with respect to the plurality of calking sections on the stator substrate, and defining a vacant area having no electric parts disposed nearby the centroid on the printed circuit board to allow the vacant area to be supported by a supporter of a calking jig.
Another and more specific object of the present invention is to provide an assembly method of a stator structure of a motor, the stator structure including a stator substrate having a double-layer structure of a printed circuit board and a magnetic plate jointed together at a plurality of calking sections, the method comprising steps of: determining a centroid with respect to the plurality of calking sections on the stator substrate; defining a vacant area without electric parts mounted nearby the centroid on the printed circuit board; calking the plurality of calking sections by using a calking jig having a plurality of calking pins for pressing the plurality of calking sections and having a retainer section for supporting the stator substrate, wherein the plurality of calking pins are disposed at positions agreeing to the plurality of calking sections provided on the printed circuit board and the retainer section is disposed facing a vicinity of the centroid so as to allow the retainer section to support the vacant area when the plurality of calking sections are calked by the plurality of the calking pins of the calking jig.
Other specific object of the present invention is to provide a motor composed of a rotor and a stator, the stator including a motor base, a printed circuit board stacked on a bottom of the motor base and a bearing holder mounted on the motor base and a magnetic core section having a plurality of stator coils, the rotor including a capstan shaft rotatably supported by the bearing holder through bearing means, a rotor yoke provided at an end of the capstan shaft, wherein the rotor is rotated by a mutual magnetic action between magnets provided on the rotor yoke and the plurality of the stator coils of the stator, wherein the bearing holder is provided with a flange protruding therefrom, the flange having motor base installation sections and core installation sections, and wherein the magnetic core section has a ring section provided with plural magnetic cores around an outer circumference thereof and has plural installation branches protruding radially toward a center of the ring section and respectively having installation portions connected respectively to the core installation sections of the flange, the plural installation branches defining cutout portions therebetween, and wherein the motor is assembled by causing the flange of the bearing holder to be interposed between the motor base and the plural installation branches together with the printed circuit board underneath, and ends of the stator coils are connected to respective terminal sections provided on the printed circuit board being partially exposed through the cutout portions defined between the plural installation branches of the ring section.
Other specific object of the present invention is to provide a method of installing a motor composed of a stator and a rotor, the stator including a motor base, a bearing holder mounted on the motor base and a magnetic core section having a plurality of stator coils, the rotor including a capstan shaft rotatably supported by the bearing holder through bearing means, a rotor yoke provided at an end of the capstan shaft, wherein the rotor is rotated by a mutual magnetic action between magnets provided on the rotor yoke and the plurality of the stator coils of the stator, wherein the bearing holder is provided with a flange protruding therefrom; the flange having motor base installation sections and core installation sections; and wherein the core section has a ring section provided with plural magnetic cores around an outer circumference thereof and plural installation branches protruding toward a center of the ring section and having respective installation portions connected respectively to the core installation sections of the flange, and wherein the motor is assembled by causing the flange of the bearing holder to be interposed between the motor base and the plural installation branches in such a manner that the motor base installation sections of the flange are exposed between the plural installation branches, and wherein a pinch roller of an apparatus is disposed on and pushed along a line toward the capstan shaft of the motor, wherein the line extends from one of the motor base installation sections to one of the plural installation branches.
Other objects and further features of the present invention will be apparent from the following detailed description.
REFERENCES:
patent: 5173628 (1992-12-01), Yoshida et al.
patent: 5461271 (1995-10-01), Asama et al.
Anderson Kill & Olick P.C.
Mullins Burton
Victor Company of Japan Ltd.
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