JPS6213426Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a motor, in which a ring-shaped generating coil for controlling the rotational speed is formed on a flat substrate, and a center hole provided in this substrate is used to support the rotating shaft of the flywheel. By fitting to the outer periphery of the bearing, the ring-shaped power generating coil is centered, thereby ensuring that the power generating coil and the frequency control irregularities provided on the flywheel are accurately opposed to each other.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 8. In the figure, 1 is the upper substrate, 2
3 is a lower substrate, 3 is an upper bearing that is fixed to the upper substrate 1 and holds the rotating shaft 4 in the axial direction, 3a is a housing that constitutes the upper bearing 3, 3b is a center hole thereof, and 3c is an inner periphery of the center hole 3b. A metal having a small coefficient of friction provided, 5 is a lower bearing that is mounted on the lower substrate 2 and supports the rotating shaft 4 in the thrust direction on the upper surface, 6 is fixed to the lower surface of the upper substrate 1, and N is provided on both the front and back surfaces.
A magnet 7 whose poles and south poles are magnetized is fixed to the bottom surface of the magnet 6, and as shown in FIG.
8 is a flywheel made of a soft magnetic material that is fixed to the rotating shaft 4; 8a is a gear-like structure located on the outer periphery of the upper surface of the flywheel 8 at a position facing the power generating coil 7a; The formed unevenness for frequency control, 9 is the flywheel 8
A ring-shaped drive magnet 10 is fixed to the lower surface of the lower substrate 2, and a copper foil is formed on the lower surface. second printed circuit board, 11
are the positioning protrusion 11a and the fixing protrusion 11 on the lower surface.
a substantially sector-shaped bobbin 12 that is firmly fixed onto the lower substrate 2 by press-fitting the bobbin b into the lower substrate 2;
is a drive coil wound around the outer periphery of each bobbin, the end of which is connected to the copper foil of the second printed circuit board 10; 13 is fixed to the lower substrate 2 at a predetermined interval; A detection member is electrically connected to the printed circuit board 10, 14 is a third printed circuit board on which circuit components for electrically controlling the motor are mounted, and 15 and 16 are connected to the third printed circuit board 14 and the first and second This is a lead wire that connects the printed circuit boards 7 and 10 of No. 2.

Center holes 6a and 7c are formed in the magnet 6 and the first printed circuit board 7, respectively, and these center holes 6a and 7c are formed as shown in FIGS.
By fitting 7c to the outer periphery of the upper bearing 3,
It is configured to allow accurate positioning.
Further, as shown in FIGS. 4 and 5, the flywheel 8 is formed with a through hole 8c extending from the upper surface to the recess 8b on the lower surface, and by inserting a pin into the through hole 8c, the driving magnet can be easily attached. It is configured so that the number 9 can be pushed out. Further, as shown in FIG. 8, the outer periphery of the bobbin 11 is configured with a tapered surface 11c that is narrow on the lower surface side that is in close contact with the lower substrate 2 and widens toward the upper surface side. By winding the coil, the drive coil 12 can be formed without having to provide flanges at both ends.
It is constructed in such a way that it will not come apart.

In the above configuration, when power is supplied to the circuit mounted on the third printed circuit board 14, the lead wire 1
Drive power is supplied to some of the plurality of drive coils 12 through the copper foil of the drive coils 6 and the second printed circuit board 10 . As a result, the flywheel 8 rotates by a certain angle due to the relationship between the magnetic field generated by the drive coil 12 and the magnetic field generated by the drive magnet 9 fixed to the lower surface of the flywheel 8. When the position of the magnetic pole of the drive magnet 9 changes as the flywheel 8 rotates, the detection member 13 detects this and sends a detection signal to the second printed circuit board 10 via the copper foil and the lead wire 16. 3 to the circuit on the printed circuit board 14. As a result, the circuit on the third printed circuit board 14 is controlled to supply power to the other drive coils among the plurality of drive coils 12, and the flywheel 8 is driven by the magnetic field generated by the drive coil. It is further rotated by a predetermined angle. Through this series of controls, the flywheel 8 is continuously driven to rotate in a fixed direction.

On the other hand, as the flywheel 8 rotates, the relative position of the frequency control unevenness 8a of the flywheel 8 and the power generation coil 7a of the first printed circuit board 7 changes, and as a result, the flywheel 8 is placed on the power generation coil 7a. A control signal having a frequency corresponding to the rotational speed of The flywheel 8 is controlled so that it always continues to rotate in a constant direction at a stable rotational speed by adjusting the electric power supplied to the flywheel 12.

By the way, in the conventional motor of this kind, as shown in FIG. A power generating coil 18 also formed on a ring-shaped substrate is fixed onto the ring-shaped magnet 17 provided, thereby controlling the motor as described above.

However, in this way, the generating coil 18 and the magnet 1
When 7 is configured in a ring shape, it is difficult to position these and the unevenness 8a for frequency control of the flywheel 8. Normally, a guide pin or the like is provided on the lower substrate 2 to center it, but assembly is difficult. However, there are problems in that dimensional accuracy tends to decrease and costs also increase.

On the other hand, in the above embodiment, the magnet 6 is made into a flat plate, and the generating coil 7a is also formed on the flat printed circuit board 7, and the center holes 6a and 7c provided in the magnet 6 and the printed circuit board 7 are connected to the bearing 3. Since positioning is performed by fitting to the outer periphery, it is extremely easy to center the magnet 6 and the generating coil 7a, and the dimensional accuracy can also be made sufficiently high.

In this way, the present invention forms a ring-shaped power generating coil on a flat board, and fits the center hole in this board to the outer periphery of a bearing for supporting the rotating shaft of the flywheel. Since the generating coil is centered, the unevenness for frequency control of the generating coil and flywheel can be opposed very easily and precisely, and as a result, accurate speed control is possible. This excellent effect can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention;
Figure 3 is a sectional view and bottom view showing the vicinity of the upper board, Figures 4, 5, and 6 are top views, sectional views, and bottom views showing the vicinity of the flywheel, and Figure 7 is the vicinity of the lower board. 8 is a sectional view showing the vicinity of the drive coil, and FIG. 9 is a sectional view of a conventional example. DESCRIPTION OF SYMBOLS 1... Upper board, 2... Lower board, 3... Upper bearing, 4... Rotating shaft, 5... Lower bearing, 6... Magnet, 7... First printed circuit board, 7a... Generator coil , 8... flywheel, 8a... unevenness for frequency control, 8c... through hole, 9... drive magnet,
10...Second printed circuit board, 11...Bobbin.

Claims (1)

[Scope of utility model registration request] A flywheel made of a soft magnetic material with a driving magnet provided on one side and ring-shaped unevenness for frequency control on the other side, a driving coil placed at a position facing the driving magnet, and a surface of the unevenness and the surface of the driving magnet. A generating coil arranged in a ring shape at opposing positions, and a magnet arranged on the opposite side facing the unevenness of the generating coil so as to position the generating coil between the generating coil and the flywheel, The flywheel is rotationally driven by supplying power to the drive coil, and a control signal corresponding to the rotation speed is obtained by the unevenness and the power generation coil, and the rotation speed of the flywheel is controlled by this control signal. In the motor, the generating coil arranged in a ring shape is formed on a flat plate-like substrate, and a center hole provided in the substrate and a center hole provided in the magnet are used to support the rotating shaft of the flywheel. A motor characterized by being positioned by fitting onto the outer circumference of a bearing.