JPS58130764A - Cylinder motor - Google Patents

Abstract

PURPOSE:To reduce the height of the entire cylinder motor by distributing rotary inertia on upper and lower shafts of upper and lower bearings and constructing to reduce the overhang amounts of the shaft at the upper and lower shafts, thereby shortening the distance between the beaings. CONSTITUTION:Two bearings 5, 5' are fored at the center of a lowe cylinder 12, thereby rotatably supporting a rotational shaft 18. A disc 15 is fixed to the upper part of the upside bearing 5 on the shaft 18, and an upper cylinder 13 is secured to the disc 15. On the other hand, a rotor magnet of a motor is secured through a rotor yoke 6 with the pole of the magnet 1 directed downwardly at the lower part of the downside bearing 5' on the shaft 18. A motor stator has a stator coil 2, a stator yoke 3, magnetic field detecting elements 4-4' and a flexible circuit board 30 mounted with the elements 4-4'.

Description

[Detailed Description of the Invention] The present invention provides a VTR that is directly connected to a Karasuhira type pushless motor.
This relates to the #S construction of the cylinder motor.

Figure 1 shows a conventional example of a cylinder motor. This example is a configuration example in which a 5-phase flat brushless motor is built into the upper part of the lower cylinder. (a) is a longitudinal sectional view, (b) is a plan view of the stator, (
C) is a perspective view of the shield ring.

The rotor magnet 1 has a multi-pole magnetized equally divided into a plane 1JIl shape, and the layer surface a poles are short-circuited by a rotor yoke 6 made of a magnetic material such as iron, and the magnetic pole tubes on the surface are directed downward to the rotor boss. 25, and the mounting 9 is attached to the rotating shaft 18. The rotor boss 25 is press-fitted or in contact with the rotating shaft 18, and two rollers are fixed at the upper and lower portions of the lower cylinder 12, which uses nine roller bearings for supporting the zero-rotating shaft 18. The motor stator is arranged so that the stator coil 2 faces downward and faces the magnetic poles of the rotor magnet 1, arranged IsK above the rotor magnet 1, and is fixed to the upper edge of the side wall of the lower cylinder 12. Stator coil 2 is equivalent to 9; the number of coil poles is magnet WB.
A flat annular stator with a flat copper structure with the same number of poles.
There is a layered identification on top. Five OS field ejecting elements 4 to 4'' are fixed to the outer edge of the vertical stator coil 20 along with the wiring board 11 at predetermined angular intervals to uniformly reduce the leakage magnetic field in the direction of the @ plane of the foot 1 rotor magnet 1. The wiring board 11 is provided in a notch in a part of the side wall of the motor built-in part of the lower cylinder 12.A shield link made of a magnetic plate is provided on the inner surface of the inner wall of the lower cylinder 12. 20 is fitted.The secondary side (fixed side) core 16' of the #A transformer is fixed to the upper 'fjjJK of the stator.Lower cylinder 12
In the 0-piece structure, the preload boss 26 and the flywheel 35t-rotating shaft 18Kaiii are installed at the bottom of the 0-tabos, and the flywheel H5 has two tack magnets 7.7' 25 and preload boss 26 apply preload between the inner rings of bearing 5.5'.

In a conventional cylinder motor with such a structure.

(1) Since it is an internal structure, the motor size is limited and its power consumption increases.

(2) The radial dimension of the cylinder is large because the lower cylinder side surface is cut out and the wiring board is pulled out from there.

佽) Because there is a notch on the side of the lower cylinder and only a shield ring is provided, there is insufficient magnetic shielding, and because the motor is located near the audio head, magnetic noise due to magnet rotation is A large impact.

0) Productivity is poor because the motor section cannot be assembled separately from the cylinder section. It is difficult to achieve gap accuracy between the primary fill (rotating @) core 16 and the secondary II (fixed III) core 16' of the transformer.

Since the structure is such that the disk 15 is inserted into the rotating shaft 18 after the motor is assembled, the surface runout of the surface on which the upper cylinder 13 is mounted on the disk tends to increase. Therefore, additional machining on this side is essential, which increases the number of manufacturing steps.

) If the rotational inertia on the upper bearing 5 is large and the amount of overhang (the length from the bearing point to the inertia body attachment point) is large, moments will easily act on the bearing 5 in extreme heat. Easy to store.

(2) Because the structure requires large bearing spacing, it is difficult to make the overall size smaller and thinner.

4@ Since the configuration is such that a part of the magnetic field is leaked from the side of the rotor magnet and the position is detected thereby, the effective magnetic flux for generating rotational force is reduced by that amount, and the motor efficiency is reduced.

There were weaknesses in the team.

The purpose of the present invention is to eliminate the drawbacks of the prior art described above.
The purpose of the present invention is to provide a cylinder motor that has high motion, low power consumption, and low cost.

In order to achieve the above object, there is provided a cylinder motor of the present invention.

(1) The structure is such that the flat motor is externally attached to the bottom of the lower cylinder, and M Chiaki's rotor magnet)? The magnetic pole is fixed to the rotating shaft at the bottom of the lower cylinder with the magnetic pole facing down, and the flat fixed consonant is placed opposite to this and further below it.

(2) Placed below the wiring board tube stator yoke.

body) The rotational position signal generating element of the magnetic field detection element group shall be constructed in a concave part such as a small hole, groove, notch, etc. in the plane of the fixed consonant. The main feature is that the electronic circuit is mounted and the circuit is incorporated into the motor body.

The present invention will be explained below based on examples.

FIG. 2 shows an example of the structure of a cylinder motor according to the present invention. This example is a six-phase motor that uses five magnetic field output elements to detect the rotational position of a rotor magnet.

There are two bearings 5, 5' in the center of the lower cylinder 12. established,
Accordingly, a disk 15 is located above the clay figure bearing 5 on the 0-rotation shaft 18 which rotatably supports the rotation shaft 18, and the upper cylinder IQ is fixed to the disk 15.

On the other hand, after one rotation @ 18, a motor rotor magnet is placed at the bottom of the lower bearing 5', and its magnetic pole is opened downward and fixed via the rotor yoke 4. @The trochanter faces the magnetic pole of the magnet 1, and the motor stator is fixed to the lower side thereof.

#Motor stator-like stator coil 2. Stator Co., V
B magnetic field detection elements 4', 4''' and these magnetic field detection elements 4 to 4'' (consisting of the attached flexible wiring board 3o), and the flexible wiring board 50 are located on the back side of the stator yoke 5 (on the back side of the stator coil 2). On the opposite side of the fixed surface) 1Mi field ratio detection elements 4 to 4 fixed with K fixed in the plane of the black plate.Insert the back side of the stator yoke black into the nine small holes. The tips of the #magnetic field detection elements 4 to 4# face the magnetic pole surface of the rotor magnet 1, so that positioning can be performed using the magnetic field of the magnetic pole surface. Flexible wiring board 50C
) i[l A patterned conductor is formed on the top of the terminal wiring of the magnetic field detecting elements 4 to 4 # middle stator coil 2, etc. Furthermore, a substrate 40t of #J type is provided, and an integrated circuit of a motor drive electronic circuit is mounted thereon. The stator coil 2 includes therein a chest wave number signal generating coil assembly for speed control. On the outer edge of the fixed chiller 5,
1Iil bottom of cup-shaped shield case 10 TFOS
t is fixed. The shield case 10 is the lower cylinder 12
The video head 14.
A minute magnet (tack magnet) having the same polarity as the rotor magnet Mi and others is located at a predetermined angle with 14' and at the same radius as at least one of the magnetic field ejection elements 4 to 4#.
7j-Fixed, the tack signal is sent to the magnetic field detection elements 4 to 4.
A one-rotation transformer 16 or 16' which is designed to obtain an output from one of the two is provided inside the lower cylinder 12.The rotor yoke 6 is integrated with the boss part and the shaft 18 By incorporating it into the bearing 5.5', a preload can be applied to the bearing 5.5'.

The magnetic field detection elements 4 to 41 detect the magnetic pole EI of the rotor magnet 1.
i magnetic field t-detect and according to this output signal integrated circuit @ 5
Current t flowing through the stator coil 2 at 0.50' - controlled to drive the rotor magnet) 1t - 1 rotation of the rotor magnet 1 rotation of the rotor magnet 10 rotations 1 rotation speed control of 151 rotations of the Kujo cylinder fixed to the shaft 18 A nine-frequency signal is generated in the stator coil 2; the output voltage signal of the coil is used to detect the position of the video head 14. Let's do it.

This configuration has the following advantages compared to the conventional configuration.

0) The structure distributes rotational inertia on the upper and lower shafts 18 of the upper and lower bearings 5.5', and reduces the amount of overhang of the shafts 18 in each part, so the bearing
By shortening the distance between the cylinders and the motor, the overall height including the cylinder section and the motor st can be reduced. (3) Rotor magnet 1
t) Since the structure is such that @@ is facing downward and the outer shell of the motor is covered with magnetic material, leakage of magnetism to the outside can be reduced and the noise that occurs frequently can be reduced. (2) Flexible wiring board sO is fixed. Chiro-ri i.

Easy to inspect and maintain the wiring as it is exposed to the outside (4) Easy to manufacture as the wiring pattern can be enlarged as the flexible wiring board area can be increased (5)
) By incorporating the drive electronic circuit into the stator section of the motor body, the entire cylinder motor including the sliding circuit can be made compact, and the number of wiring terminals can be reduced. At the same time, it is possible to connect other S connections by equal pressure connector connection. There can be 11 connections. (6) By fixing the rotor magnet 1 to the shaft 18 via the rotor yoke 6, the upper and lower bearings 5
．． Since a preload can be applied to the upper cylinder 5', additional work can be performed on the fixing m' of the upper cylinder 13 of the disk 15 by lowering the upper cylinder 13.

Therefore, high-precision installation is possible. The fixed side of the ff1 rotary transformer is fixed to the bottom surface sVc of the inner part of the lower series, so it is easy to narrow the gap between the fixed yoke and the rotary side yoke of the rotary transformer. (8) When assembling the motor part (9) Since the structure is assembled at the end of the fixed consonant, wiring boards, coils, and integrated circuits will not be damaged during production. (9) The structure does not expose the motor rotor to the outside, so wiring and other parts can be It can be installed close to the motor, and can prevent dust from entering the motor. 1
Since the wiring board and the magnetic field detection element are not provided in the motor electric aS, the stator coil volume can be increased accordingly, and the motor efficiency can be improved. (b) A tack magnet is provided in the motor electric section and also serves as a magnetic field detection element as a tack sensor.The magnetic noise caused by this can be reduced, and a small and low-cost tack part can be constructed. Furthermore, even after the motor is installed, the timing taIF of the tack signal generation relative to the video head position can be adjusted by adjusting the fixed position of the motor stator in the 8 chest direction.

Figure 1 shows the identification cylinder motor used in the cylinder motor with the above structure.
This is an example of the structure of R3. (gr is a plan view.

(h) is a sectional view. One small hole 35 to 351t is provided at an interval of 120° in the plane of the magnetic field ejection element 4 of 311 above.
The zero fixed rotary rotor, which is designed to be inserted into a 4# rotor, has no hole in the center to prevent the magnetic field of the rotor magnet 1 from leaking to the lower part of the rotor.

FIG. 4 shows an example of the structure of a 7-lexiple wiring board 50.
On one surface of the piece 11i of the substrate 50, there are five magnetic field detection elements 4 to 4.
A 4# board is fixed, and a wiring butter/conductor board is provided on the other side. The #IF+3 pattern conductor is an integrated drive circuit (rotation) with three terminals of the stator coil 2, eight terminals of the AL field detection elements 4 to 4#, and two terminals of the frequency signal generation coil mounted on the board surface. ) patterned conductor for connecting to the terminals of the traces 50, 50' and the integrated circuit 50, 50'
Furthermore, another control circuit Kl! In the case of one actual pongee with pattern conductor and TL- provided for connection, the integrated circuit is 50.50
'' is an energization signal forming part and a driving part, respectively, and as shown in FIG.

Therefore, the connection pattern conductors of the stator coil terminal, the magnetic field detection element terminal, and the end of the chest frequency signal generating coil are indirectly connected to the integrated circuit 50, 50' through the pattern conductors on this integrated circuit fixing board 40. The 0 energization signal forming part is a part that forms p-phase 6-phase pulses using an inverter and an AND gate, and the main body IInIB is a part that uses 6 power transistors to control power supply to the stator coil 2 using 4-phase pulses. This is the part to do. The number of pattern conductors connected to other control circuits Km through the integrated circuit fixing board 40 and the flexible wiring board 30t is five. Therefore, by mounting the integrated circuit on the wiring board in the motor main body as in this embodiment, the number of terminals that can be drawn out from the motor main body can be reduced by 1% from t1s to five. Furthermore, it is possible to connect the motor body and the control circuit with one connector.

In the above embodiment, the stator structure is such that the magnetic field detecting element is inserted into nine small holes from the back side of the tube stator 1 in its plane. - Stator coil fixing table 1lli (stator coil fixing WJ911
) K is provided and the wiring board with this fixed is attached to the back side of the stator yoke.
There are also structural forces that will bring it out. In this case as well, the action and effect are similar to those in the above embodiment.

According to the invention, a cylinder motor K is used.

(1) The bearing distance is shortened and the cylinder motor can be configured as a thin, high-density I [suitable for mounting].

Since the magnetic pole surface of the rotor magnet faces downward and is stored in the outermost shell of the rotor, magnetic leakage to the outside of the motor can be reduced and magnetic noise can be reduced.

-) The wiring board can be exposed to the outside, making it easier to inspect and maintain the motor.

(Hiro) Since the wiring board area can be increased, the motor drive electronic circuit can be mounted on the wiring board surface of the t-stator yoke & surface.
It is possible to simplify and downsize the motor structure including the drive circuit.

俤) The work of assembling the motor into the cylinder part can be done at a low cost.

(6) Since the rotating part of the motor can be constructed so that it is not exposed to the outside of the motor, other parts can be installed close to the motor, making it easy to integrate into the set chassis, and preventing dust from entering the bearing part. can.

(γ) Additional machining of the disk is possible with the rotor magnet installed in the shaft, and it is possible to finish the disk to an ion degree.

Effects such as this can be obtained.

[Brief explanation of the drawing]

No. 157Q is a structural diagram of a conventional cylinder motor, Fig. 2 is a structural diagram of a cylinder motor of the present invention, No. 3m is a structural diagram of a fixed chiller used therein, and No. 4S is a structural diagram of a wiring board.
Figure 5 is a diagram showing the integration of drive circuits on an insulating substrate (2) road assembly. 1: Rotor magnet 2: Stator coil! l: III stator yoke 4~4#: Magnetic field detection element 7: Tack magnet 10: Shield case 12
:Lower cylinder 13:Upper cylinder 18: @Rotating axis Fig. 1 (cz) Fig. 2 Fig. 3 Fig. 4 ゝ50'

Claims (1)

[Claims] t A nine-pole magnetized rotor magnet directly connected and fixed to the upper cylinder rotating shaft is controlled by an electronic circuit and rotated by feeding running current R, t to a fixed stator coil facing the magnetic pole surface. To install the head, in the cylinder motor that is directly connected to the cylinder motor that rotates the upper cylinder, a flat rotor magnet is fixed to the rotor protruding from the lower part of the lower cylinder with its magnetic pole tube facing downward. Opposed to and below the magnetic poles of the rotor magnet, at least a flat identifier coil, a stator eye, and an it.
A cylinder motor characterized in that a stator consisting of a wiring board having a wiring pattern conductor and a rotational position signal generating section is disposed on the rotor.