JPS6362994B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator for a motor such as a step motor used in a timepiece, and a method for manufacturing the stator.

For wall-mounted clocks, table clocks, etc., motors, gears, circuit blocks, etc. are placed in cases,
A clock movement is constructed by holding it in a case back, etc., and a clock is constructed by attaching this clock movement to the case of a wall clock or table clock. Conventionally, the watch movement shown in FIG. 1 has been used. In the figure, reference numeral 1 denotes a movement case, inside which a motor 4 consisting of a coil 2 and a rotor 3, a circuit block 5, and a gear train 6 that transmits the rotation of the rotor 3 to the clock hands. A battery 7 is housed therein. In such a timepiece movement, the coil 2 of the motor 4 has a size determined by the torque that moves the clock hands, and is thicker than the gear train 6, circuit block 5, etc. Therefore, the thickness of the watch movement is motor 4
The thickness of the coil 2 is almost determined by the thickness of the coil 2, and it has been difficult to construct the coil 2 thinly. Note that if the length of the coil 2 in the axial direction is increased in order to reduce the diameter of the coil 2, a problem arises in that the movement case 1 becomes larger.

Therefore, the present applicant has proposed a timepiece movement in which the iron core of the motor is formed into a substantially circular ring, and a circuit block and a wheel train are arranged inside the circular ring to achieve a thinner design.
However, since the coil has an annular shape, it becomes difficult to wind the coil, resulting in problems such as a decrease in work efficiency and irregular winding of the coil.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electromagnetic device and a method for manufacturing the same, in which a coil winding operation can be easily performed while using a substantially annular iron core.

An embodiment in which this invention is applied to a timepiece movement is shown in FIGS. 2 to 12. In this clock movement, the rotation of the rotor 23 of the step motor 21, which rotates 180 degrees once every 30 seconds, is controlled by the minute hand 18.
and the hour hand 19.
Iron core 22 of step motor 21 (Figs. 5 and 6)
In the figure, the iron core 22 is formed into a substantially annular shape, and magnetic poles 22a and 22b surrounding the rotor 23 are formed at both ends of the iron core 22, and two arc-shaped coil blocks 8 are formed in a portion of the iron core 22 other than the magnetic poles 22a and 22b. .
6 and the lower case 27. iron core 2
2 is made of a magnetic material such as permalloy or an electromagnetic soft iron rod. One magnetic pole 22a of the iron core 22 is formed by an extended portion with the same curvature as the intermediate portion, and the other magnetic pole 22b is formed by being bent inward in a V-shape. In addition, as shown in Fig. 13, the magnetic pole 2
2b' may be bent outward. The distances A, B, and C (FIG. 7) between the rotor 23 and each part of the magnetic poles 22a and 22b are such that A<B<C. Each coil block 8, 9 is formed by winding a coil winding 11 around a cylindrical coil bobbin 10 and forming it into an arc shape, and after forming, it is inserted into the iron core 22 from the magnetic pole 22a side. When inserted, the V-shaped magnetic pole 22b of the iron core 22
However, it can be easily inserted by twisting the iron core 22 slightly. The coil blocks 8 and 9 fitted onto the iron core 22 are installed in receiving grooves 29 provided in the upper and lower cases 26 and 27 and having a substantially semicircular cross-section. The rotor 23 is fixed to a shaft 30 (FIG. 4), and both ends of the shaft 30 are connected to holes 2 in the lower case 27.
3' and a pin 23'' of the upper case 26. Also, an output gear 30a is provided on the shaft body 30 of the rotor 23. It is polarized into two poles so that the magnetic poles are different on both sides of the cross section passing through the core (broken line l).The gear mechanism 24 has an output gear 30a of the rotor 23.
It consists of a second wheel 31 that meshes with the second wheel 31, a minute wheel 18', etc. The second wheel 31 is attached to the boss 31' of the upper case 26.
mounted on. In FIG. 3, 32 is a needle turning knob.

The circuit block 25 drives the motor 21, is provided on a printed circuit board 33 (FIG. 3), and has a circuit configuration as shown in FIG. 10. That is, 34 is an inverter, 35 is a crystal resonator,
36 is a capacitor, 37 is a trimmer capacitor, 3
8 is a frequency dividing circuit, 39 is a waveform shaping circuit, and 40 is a drive circuit. Output terminals 41a, 4 of drive circuit 40
1b is connected to the connection terminal 64 of the coil 28. The inverter 34, the frequency dividing circuit 38, the waveform shaping circuit 39, and the drive circuit 40 are composed of one-chip integrated circuits (hereinafter referred to as chip ICs). The power supply voltage for circuit block 25 is obtained from a secondary battery which is charged from a solar cell (not shown). To explain the printed circuit board 33, the outer circumferential shape is formed into a substantially circular shape smaller than the motor coil 28, and a circular cutout 33a is provided inside so that the output gear 23 and the second wheel 31 do not come into contact with each other. Resin flow prevention frame 42 to prevent resin sealing the chip IC (not shown) from flowing.
(Fig. 3) is constructed on a chip IC on a printed circuit board 33, and the chip IC is sealed. A trimmer capacitor 37 and a crystal oscillator 35 are then placed above it. Note that the resin flow prevention frame 42 is provided with positioning notches for positioning the trimmer capacitor 37 and the crystal resonator 35. Furthermore, a reset terminal 43 is arranged on the printed circuit board 33, and by pressing a reset button 44, the reset terminal 43 comes into contact with the pattern on the printed circuit board 33, and the count of seconds is reset. The reset button 44 is fitted into a hole 45 in the lower case 27. 36' is a capacitor,
36'' is a terminal.

The rotor 23 of the motor 21 rotates 1/2 at intervals of 30 seconds. If the reduction ratio from the rotor 23 to the minute wheel 31 is set to 1/60, the minute wheel 18' will change to 1/120 in 30 seconds.
It will rotate. The minute wheel 18' is shown in FIG.
As shown in FIGS. 4 and 8, the upper case 26
The minute hand shaft 16 is press-fitted into the center of the minute hand shaft 16 and is fixed thereto. The minute hand shaft 16 is loosely fitted into the hole 46 of the upper case 26, and a minute hand bush 17 is press-fitted into one end of the minute hand shaft 16. A needle turning knob 32 is press-fitted to the other end of the minute hand shaft 16. Fixed gear 47 with 11 teeth on the surface of the upper case 26
are integrally formed (Fig. 2, Fig. 8, Fig. 9).
figure). 48 is an internal gear integrally provided on the back side of the base of the hour hand 19, and has 12 teeth. An eccentric cam 49 is provided integrally with the minute hand bush 17, and is fitted into a center hole 50 (FIGS. 8 and 9) provided at the base of the hour hand 19. The minute hand 18 has a notch 18a, and the minute hand bush 17
It is loosely coupled to the protrusion 17a.

The operation of the movement will be explained. motor 2
The 1st coil 28 is connected to the 11th coil 28 from the circuit block 25.
An output waveform as shown in the figure is applied, and current flows alternately at 30 second intervals. Therefore, the magnetic poles 22a and 22b at both ends of the iron core 22 are alternately magnetized. On the other hand, the rotor 23 is magnetized into two poles as described above,
Also, the distance between the magnetic poles 22a and 22b is A<B<
C, the rotor 23 faces in a magnetically balanced direction (in the direction of arrow P in FIG. 7). Therefore, as the magnetic poles 22a and 22b are alternately magnetized as described above, the rotor 23 rotates in one direction (the direction of arrow M in FIG. 7). The rotation of the rotor 23 is transmitted to the second wheel 31 and the minute hand wheel 18', and the rotation of the minute hand wheel 18' is transmitted to the minute hand bush 17 press-fitted into the minute hand shaft 16, thereby displaying the minutes. The minute hand bush 17 is connected to the hour hand 19 via an eccentric cam 49.
The internal gear 48 integrated with the internal gear 48 is driven. Since the internal gear 48 meshes with a fixed gear 47 that is integral with the upper case 26, one rotation of the eccentric cam 49, that is, one rotation of the minute hand 18, causes the hour hand 19 to rotate 1/12, and the hour can be displayed.

The time is set by forcibly turning a hand turning knob 32, which is integrated with the minute hand wheel 18' and the minute hand shaft 16, from the outside. At this time, rotor 23
It can also be rotated, but there is no particular negative effect.

The hour and minute hands 18 and 19 are driven in this way, but the shape of the iron core 22, that is, the coil 28
Since the shape is approximately circular, the effective coil length becomes longer and the finished coil diameter can be reduced. Therefore,
The thickness of the movement can be made that much thinner. Further, since the gear mechanism 24 and the circuit block 25 are arranged inside the coil 28, the movement can be made smaller.

In addition, since the coil of the motor 21 consists of a plurality of arc-shaped coil blocks 8 and 9, it can be inserted into the iron core 22 after the coil blocks 8 and 9 are completed, compared to the case where the coils are wound around the iron core 22 to form a coil. This allows efficient coil winding. Furthermore, since the coil winding work is easy, there is an advantage that the windings 11 can be neatly arranged.

FIG. 12 shows a method of manufacturing the coil blocks 8, 9. Reference numeral 15 denotes a mold, which is formed of a round iron rod with a spiral curve that gradually increases the curvature from a straight portion. The end portion of the mold 15 is formed to have the same curvature as the finished coil blocks 8 and 9. When manufacturing the coil blocks 8 and 9, first a straight cylindrical coil bobbin 1 made of resin is manufactured.
The coil winding 11 is wound around 0'. Coil winding 1
For No. 1, a self-fusion wire is used. The straight coil blocks 8', 9' thus formed are passed through the mold 15 from the starting end 15a to the ending end 15b while applying heat or a solvent, and are gradually molded. Molding mold 15
The coil blocks 8 and 9 are shaped into the desired curvature when passing through the terminal end 15b of the coil block. In this way, the coil winding 11 can be formed into an arc shape after winding, and the coil winding 11 can be wound on the straight coil bobbin 1.
0', the winding of the coil winding 11 becomes even easier. Further, since the wires are wound around the coil bobbin 10' which is in a straight state, there is an advantage that the wires can be arranged neatly.

As described above, the motor stator of the present invention is a motor using a substantially annular iron core having magnetic poles at both ends facing the rotor, and a coil block is fitted over almost the entire length of the iron core to achieve a thinner design. However, we are also trying to make the coil winding work easier. That is, it is divided into a plurality of arc-shaped coil blocks, and the iron core has the same cross-sectional shape over substantially its entire length, and one end is arc-shaped with substantially the same curvature as the intermediate portion. Therefore,
After a coil is wound on a coil bobbin in advance to form a coil block, the coil block can be passed through the iron core from the one end. In this case, since each coil block is annular and divided into a plurality of parts, the winding work can be performed more easily than when winding is performed on a substantially annular coil bobbin. As described above, the motor stator of the present invention has the effect of being able to be easily coiled while achieving a thinner design. In addition, according to the manufacturing method of the present invention, the coil winding is wound around a straight coil bobbin and then formed into an arc shape, making the coil winding work even easier and the windings arranged neatly. effective.

[Brief explanation of drawings]

Figure 1 is a plan view of the interior of a conventional watch movement, Figure 2 is an exploded perspective view of a watch movement to which this invention is applied, Figure 3 is an exploded perspective view of the watch movement from the back, and Figure 4 is the same. 5 is a plan view showing the iron core and coil block, FIG. 6 is an exploded perspective view showing the iron core and coil block, and FIG. 7 is a plan view showing the magnetic poles of the iron core. , FIG. 8 is an exploded perspective view showing the gear mechanism, FIG. 9 is a bottom view of the base end of the clock hand, FIG. 10 is an explanatory diagram of the motor drive circuit block, and FIG.
The figure is a waveform diagram of the circuit block, and FIG. 12 is an explanatory diagram showing an embodiment of the manufacturing method of the present invention.
FIG. 13 is a plan view of a modified example of the iron core. 8, 9... Coil block, 10, 10'...
Coil bobbin, 11... Coil winding, 16... Minute hand shaft, 18... Minute hand, 19... Hour hand, 21... Step motor (electromagnetic device), 22... Iron core, 22
a, 22b...Magnetic pole, 23...Rotor, 24...
Gear mechanism, 25...Circuit block, 26...Movement upper case, 27...Movement lower case, 33...Printed circuit board, 30a...Output gear, 35...Crystal oscillator, 47...Fixed gear, 4
8... Internal gear, 49... Eccentric cam.

Claims (1)

[Scope of Claims] 1. The cross-sectional shape is the same over substantially the entire length, one end is arcuate with substantially the same curvature as the intermediate portion, and the other end is bent into a substantially V-shape, and there is a space for arranging the rotor between the one end and the one end. 1. A stator for a motor, comprising: a substantially annular iron core formed with a cylindrical coil bobbin; and a plurality of arcuate coil blocks wound around a cylindrical coil bobbin and externally fitted in tandem over substantially the entire length of the iron core. 2. A substantially annular shape having the same cross-sectional shape over substantially the entire length, one end having an arc shape having substantially the same curvature as the intermediate portion, and the other end being bent into a substantially V-shape to form a space for arranging the rotor between the above-mentioned one end. a step of preparing a plurality of coil blocks to be wound around a straight cylindrical coil bobbin and externally fitted onto the core in tandem; and a step of preparing a plurality of coil blocks to be wound around a straight cylindrical coil bobbin and fitted onto the core in tandem, and placing each of the coil blocks in a spiral curved mold with heat or solvent. 1. A method of manufacturing a stator for a motor, comprising the steps of: bending and forming the coil block through the iron core; and sequentially fitting the curved coil block over substantially the entire length of the iron core.