JPS59159653A - Magnetizing device - Google Patents

Abstract

PURPOSE:To simplify the magnetizing step by forming slots perpendicularly crossing at the center at a fine pitch to form frequency detecting poles of a fine pitch on the entire end face of a magnetizing device, thereby simultaneously magnetizing the main poles and the frequency detecting poles. CONSTITUTION:A magnetizing yoke 14' is formed with slots 17' perpendicularly crossing at the center on the end face 16' of a cylinder 15' made of a ferromagnetic material, exciting coils 18 of thick diameter are wound in the slots 17', many slots 18 perpendicularly crossing at the center at fine equal interval pitch are formed to form a frequency detecting pole 13 of fine pitch on the entire end face 16', and exciting coils for forming the frequency detecting pole 13 of the fine diameter is spirally wound in the slot 19. Since a magnetizing device for forming a main pole and a magnetizing device for detecting the frequency are integrated, the both poles can be simultaneously and readily magnetized.

Description

[Detailed Description of the Invention] The present inventor has developed an M in which a frequency detection magnetic pole can be easily formed on the four magnetic poles of a motor's king magnet.
It is related to la reward equipment.

In a disc-type brushless smoker used for a direct drive type cassette tape L/Gouda, etc., it is necessary to obtain a detailed rotational speed signal. As such a disc-powered brushless motor 1, as shown in FIG.
i9iW is known. To explain this motor 1, the motor 2 has a circular, plate-shaped rotor yoke 3.
is fixed to the lower surface of the rotor yoke 3, and a ring-shaped raised t1 magnet 4 as shown in FIG. 2 is fixed in contact therewith. The tip side of the motor 2 is the center spindle 5
is formed, and is rotatably delivered by a beam receiver 6 on the lower end thereof. A master stator yoke 7 is fixed to the first receiver 6, and on this stator yoke 7, as shown in FIG.
The #i spaced sections are glued and fixed to prevent folding. A magneto-electric transducer 9 for detecting the rotational position is housed in the cavity within the frame of the A-coil 8. A disk-shaped printed letterpress 10 is fixed to the upper surface of the Ichiisogo coil.A comb-like n-electronic pattern 11 for detecting the rotational speed of the rotor is formed on the top surface of this printed circuit board IQ. The printed circuit board 10 and the field magnet 4 are opposed to each other with a small gap in between.

FIG. 2 is a plan view of the field magnet 4 of FIG. 1. As shown in FIG. 2, the main magnetic pole 12 of the field d magnet 4 is
It is formed into four poles with N and S poles equally spaced from each other, and around 1S for detecting the rotor rotational speed.
A frequency detection magnetic pole 13 of O@ is formed. N,
S is strongly magnetized as well as N' and S'.

FIG. 5 is a perspective view of the shaft 11 and device 14 for explaining the conventional alignment method of the main pole 12. This gradual lowering device 14 (me, shrine etc.)
Insert 7n17 into the end face 16 of
1 In addition to this, the generation for driving is 12? r: The dynamic sensing coil 1a to be formed is wound A. This is a contact type on the t magnet 7), and on the excitation/low coil 18>a
By doing a j, you will get 4 out of 12 balls out of the 4 poles.

In this way, after first looking at the ball pole 12, is there a special magnetizing device (not shown) for fixing the frequency detection magnetic pole 13? Using 13 magnetic fields for detection of circumference and number, M
Magnetize.

Therefore, the magnetic flux density waveform in the gap formed by the field magnet 4 is as shown in FIG.

As shown in FIG. 6, the magnetic flux density waveform i'' formed by the frequency U detection @ne 13 is multiplied by 1 tatami in the shadow of the direct flux density wave formed by the Tamade 1 12. Formed by the King-Goku 12 - Higashi-mitsu-shu-saka-shaped peaks or valleys have fine uneven waveforms.

FIG. 44 is a plan view of the printed circuit board 10 shown in FIG. On the surface of the printed circuit board 10, in a portion facing the output point 13 of the frequency t of the field magnet 4, four comb-shaped turns 11 are formed as shown in Fig. 44. The bias of this guiding pattern 11 is the same as the pitch of the frequency detecting magnetic poles 13 shown in FIG. Doichi Pa?
-711 in the radial direction, when the ψ rie faces the N or S1m of the frequency detection magnetic pole, the healing junction between them faces N' or N'. C'n
Therefore, an electromotive force is generated in the same direction in accordance with the rotational speed of the frequency detection 11n shelf 13 on each line segment, and the conduction [is the pattern 11
The rotation of the rotor is determined by the output terminal (not shown) of the detected frequency according to IjK.

Incidentally, the pulse-like force generated by the frequency detection tM wire 13 is activated intermittently, but since the conductive pattern 11 is formed around the entire circumference as shown in FIG.
It is swallowed by g-waves. In addition, even if the pitch irregularity is found in the 66 rule 13 for the number of rotations, the pitch irregularity is averaged by the plurality of 4 tiger patterns 11, and when the rotor rotational speed is one foot, the detection output of a constant frequency is Obtain and take. Changes and disturbances in the rotor rotational speed are extracted as frequency modulation components of the detection output.

11 Rolling speed detection screw 7, 6 All disk reflux smoke 1 is 1. In the second half of the construction period, the non-reduced lights are completely out of whack, and companies are desperately trying to adjust the L lighting.

However, in the conventional case, it took a lot of effort to form a field (I + l magnetic pole 4) having all the raw eel, HLJi 12 and frequency detection magnetic pole 13. In other words, the field along which the main magnetic pole 12 This is because the shuttle and the celadon (13) for frequency detection had to be completely separated.

For this purpose, it requires a secondary device to form the main power source 12 and a power source device to form the frequency/trend flow channel 13, making it extremely expensive.

Referring to FIG. 4, one conductive pattern 11 is formed in the circumferential direction;
By narrowing the width with 1a', V''ii vortices are generated due to the current contact. It is desirable to shift the IAk to 212 (Fig. A7) or 3 or more stages in the radial direction of IEJ. However, in the conventional method, forming the frequency detection magnetic pole 13 as shown in FIG. 2 requires a storage process several times, so the resulting product also has the disadvantage of causing fibroids. Was.

The present invention is based on the above circumstances, and uses M fitting (2) to enable alignment with the main magnetic pole and the frequency detection magnetic pole at the same time, and to make it possible to align the main magnetic pole and the frequency detection magnetic pole at the same time. In addition to making it possible to organize the pre-printing process for each song,
This was designed to obtain the full range of Kai-no-Magne nods that can be applied even when the turn 11 is completely shifted in phase in the circumferential direction and several stages are arranged in the radial direction.

Such an object of the present invention is to provide a magnetizing device which is sunk in a groove perpendicular to the center of the end face of a cylindrical body made of a magnetic material, in order to wind an excitation coil for forming a main magnetic pole for J drive. In order to form all of the frequency detection magnetic poles at a fine pitch on the entire end face, a large number of grooves are formed at a fine pitch and directly in the center, and an excitation coil is wound around the end face. This is achieved by providing an eight-day device called t-standby.

Hereinafter, all embodiments of the alcohol brewing device of the present invention will be explained with reference to FIG. 8 and subsequent figures. It should be noted that the parts marked with: and iii in the same manner as in FIG.

FIG. 8 is a perspective view of the Numata yoke 14' of the present invention. A groove 17' that is perpendicular to the center is formed in the end surface 16' of the cylindrical body 15' made of a ferromagnetic material, and this groove 17' is rt'=17'.
As shown in FIG. 5, in order to install an excitation coil 18 with a large diameter and to form the frequency detection magnetic poles 13 with a fine pitch on the entire end face 16'. Forming a large number of lines 19 that are perpendicular to each other at a finely spaced pitch,
As shown in FIG. 9, an excitation coil 21 for forming a circumference EL number detection ffl pole 13 having a thin wire diameter is wound around the coil 19 in a complete spiral shape.

Therefore, if we first apply NmkDL to the excitation coil 18 using this eyebrow magnet yoke 14%, then as a matter of course, as shown in Fig. 2, the magnetic poles of N and S? A four-pole main magnetic pole 12 is formed. After that, the excitation coil 21v
c current? When flowing, a frequency detection magnetic pole 13 is formed in the main magnetic core 12, and the magnetic pole 13 is formed in the main magnetic core 12, and the magnetic pole 13 is formed in the main magnet 12.
' can be obtained.

In addition, since the assistance coil 21 has a wire diameter that is +Mtl, the frequency detection magnetic pole 13 is relatively weakly swamped compared to the main 1i pole 12. Therefore, frequency detection magnetic pole 1
The pulsed magnetic flux caused by 3 has almost no effect on the electric wire 8. Incidentally, any end of the excitation coil 18.21 may be excited.

Since the present invention has the above-mentioned configuration, it includes an N magnetic device for complete formation and a monitoring device for frequency detection. Since it is integrated, it is possible to easily carry out both the 6R pole and the 1st direction for detecting the frequency 1, and mass-produce the 6R magnet shown in FIG. 10 at low cost. Since the magnetizing device that has the function of 1A is integrated into a small sail, it is inexpensive and highly effective. Also, 1. What is the phase of S-den Bakun in the circumferential direction?
Is it smooth and multiple in the radial direction? It is an effect that can be applied even when C9, j2 arrangement is started (a magfuft can be obtained in each edition.

[Brief explanation of the drawing]

% 1 Figure Vertical curved view of hadisk type brushless motor.
Figure 2 is a plan view of the main pole and the low-field magnet that is used for frequency detection. An explanatory diagram to show the arrangement and method of the front coil, Figure 4 is a printed circuit board with a conductive pattern, and Figure 5 is a yoke showing the conventional magnetizing force method for forming the main magnetic pole. FIG. 6 is a waveform diagram of the magnetic flux confinement formed by the field noise magnet shown in FIG. 2. FIG. Is Figure 8 a funny example of the present invention?
FIG. 3 is a plan view of a lower boundary magnet shown in FIG. 1...Disc type brushless smoke, 2...Motor book, 3...Rotor yoke, 4.4'...Separate magnet, 5...Center shrimp/dollar,
6...Bearing, 7...Stator yoke, 8...
``Ha intruder coil, 9...magnetic conversion confectionery, 10...
・Printed circuit board, 11...conductive pattern, 12・
・・Main pole + [ri, 13...Magnetic pole for frequency detection,
14.14'... vertical yoke, 15.15'...
Cylindrical body, 16.16'...Cut surface, 1 end, 17'.
... Groove, 1B... Excitation coil, '19.20.
...Lecture, 21...Excitation coil. tυ Allowance - Hitoshi Hashi Yoshiki αρ 1st Closing Chrysanthemum 3 Figure 4

Claims (1)

[Claims] In order to mount the excitation 11f1 coil that forms the main magnetic pole for driving, a 4M cylindrical body made of magnetic material is provided with a perpendicular groove in the center. In order to form a detection pole with a small pin-notch frequency e, a large number of fine grooves are formed at seven centers and perpendicular to each other, and an excitation coil is installed in the grooves. Patented anti-Soil yoke.