JPH0549192A - Drum motor - Google Patents

Abstract

PURPOSE:To facilitate assembling by extending a part of a laminated core, providing a plurality of click parts thereon and then inserting the plurality of click parts into holes made through a stator side printed board. CONSTITUTION:A stator assembly 20 is fabricated by combining a core assembly 10 and a board assembly 19. In other words, a plurality of click parts 8b are inserted into hole parts 15a of a printed board 15 and the terminal of a coil 9 is connected with the patterned part of the printed board 15. At that time, dimensions and positional relation between the click part 8b and the hole part 15a of the printed board 15 are adjusted utilizing the resiliency of the click part 8b. When thus fabricated stator assembly 20 is secured through screws 21 to a fixed drum 5, the laminated core 7 and the printed board 15 are centered according to the fit part of the fixed drum 5 and thereby they are secured rigidly with no rattling (shift of center). According to the invention, assembling work can be facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless motor, and more particularly to a drum motor suitable for use in a VTR drum motor.

[0002]

2. Description of the Related Art In a conventional drum motor, a method in which a stator assembly is temporarily held on a printed circuit board by a claw of a pedestal and is firmly fixed to a fixed drum with a screw is disclosed in JP-A-63-249454. , The pedestal claw was to be used with a separate component from the core insulator. Also, it is known that the core insulator is integrally molded with the core by resin molding.
As described in Japanese Patent Publication No. 85, the claw portion is not provided by extending a part of the core insulator. Further, the use of an iron printed circuit board for the printed circuit board is described in Japanese Utility Model Laid-Open No. 62-107583, but it is designed so that the claw part produced by extending a part of the core insulator is locked. There wasn't.

[0003]

Since the above-mentioned prior arts are made separately, none of them are comprehensively applied.

It is an object of the present invention to provide a drum motor which has a reduced number of parts and a reduced number of steps and is easy to assemble.

[0005]

The object of the present invention is to provide an insulating layer to be applied to the surface of a laminated core by resin molding, and to extend a part of the insulating layer to provide a plurality of claws, and to provide the printed circuit board on the stator side. This is achieved by inserting and locking in the hole.

[0006]

The claw portion that is inserted into and locked in the printed circuit board is an insulating layer that provides a space formed between the laminated core and the resin molding die on the predetermined surface of the laminated core when the laminated core is assembled in the resin molding die. It is obtained by setting a part of the extension to be the same as the claws (plurality) and filling and solidifying the molten resin in the space.

[0007]

Embodiments of the present invention will be described below with reference to FIGS.

1 to 3, 1 is a rotary drum, 2 is a video head, 3 is a rotary support, 4 is a rotary shaft,
5 is a fixed drum, 6a is an upper bearing, 6b is a lower bearing,
The rotary drum 1 on which the video head 2 is mounted is attached to a rotary shaft 4 via a rotary support 3, and is supported by an upper bearing 6a and a lower bearing 6b with respect to the fixed drum 5 so as to be rotatable. ..

Reference numeral 7 denotes a laminated core, which is obtained by punching magnetic steel sheets into a predetermined shape, laminating a required number of the laminated sheets, and fixing them with a rivet (not shown), or forming irregularities on a part of the core, and sequentially stacking and fixing them. .. Reference numeral 8 denotes an insulator, which is obtained by integrally coating a predetermined surface of the laminated core 7 with a resin such as plastic using a molding die. Reference numeral 9 denotes a plurality of drive coils, in which a large number of magnet wires are wound around the laminated core 7 with an insulator 8 interposed therebetween. Reference numeral 10 denotes a core assembly, which is a combination of a laminated core 7, an insulator 8 and a plurality of coils 9.

Reference numeral 11 denotes a rotor assembly mounted on the lower portion of the rotary shaft 4, which has a cylindrical case 12 having a bottom and a case 12
This is a combination of a ring-shaped magnet 13 installed on the inner peripheral side of the above and a signal magnet 14 protruding on the outside.

Reference numeral 15 denotes a printed circuit board, which is made of an iron plate as a base, and a copper foil is adhered to the surface of the base plate through an insulating layer, and then a pattern of an electric circuit, a power generating element, a coil terminal connecting portion and the like is provided. Reference numeral 16 is a position detecting element composed of a Hall effect element, which is installed so as to face the ring-shaped magnet 13 and detects the position of the rotor assembly 11. Reference numeral 17 is a position detecting element composed of a Hall effect element, which is a signal magnet 1
4 position detection. Reference numeral 18 is a plug for relaying the electric signals and electric power of the position detecting elements 16 and 17 and the drive coil 9 to the outside. Reference numeral 19 denotes a board assembly, which includes a printed board 15, position detection elements 16 and 17,
This is a combination of the plug 18 and the like. Reference numeral 20 denotes a stator assembly, which is configured by combining the substrate assembly 19 with the core assembly 10 and connecting the end of the drive coil 9 to the printed circuit board 15. Reference numeral 21 is a screw, which is used when the stator assembly 20 is attached to the fixed drum 5.

In the rotary drum device thus constructed, the drum motor constitutes a magnetic circuit between the laminated core 7, the ring-shaped magnet 13 and the case 12, and is connected to a well-known motor drive circuit (not shown). When electric power is applied to the rotor assembly 11, the rotor assembly 11 obtains torque and rotates.

In the drum motor constructed as described above, the insulator 8 coated on the laminated core 7 is the drive coil 9
A portion 8a for insulating the wire, a portion 8b formed by extending a portion thereof to form a claw portion, and a portion 8c for abutting against the printed circuit board 15.
And a portion 8d that holds the end of the drive coil 9 and a portion 8e that covers the head portion of the mounting screw. These 8
Each part of a to 8e is manufactured at the same time when the insulator 8 is integrated with the laminated core 7. That is, when the laminated core 7 is incorporated into the resin molding die, the space formed between the laminated core 7 and the resin molding die is set to be the same as the portions 8a to 8e, and the space is filled with the molten resin. It is obtained by solidifying. Incidentally, it is desirable that the position of the claw portion 8b is set at the most distal end portion of the laminated core 7 due to the structure of the resin molding die.

The stator assembly 20 is manufactured by combining the core assembly 10 and the substrate assembly 19 described above. That is, the claw portion 8b is inserted into the hole portion 15a of the printed circuit board, and the end of the coil 9 is attached to the printed circuit board 15.
Is to connect to the pattern part. At this time, the claw portion 8
By using the elasticity of b to adjust and set the size and positional relationship between the claw portion 8b and the hole portion 15a of the printed circuit board, a slight rattling (center misalignment) may be caused only by inserting between them. And, it becomes possible to lock.

When the stator assembly 20 manufactured in this manner is fixed to the fixed drum 5 with the screw 21, the laminated core 7 and the printed circuit board 15 are centered along the fitting portion of the fixed drum 5 and , It becomes robust because there is no rattling between the two.

Further, since the printed circuit board 15 is based on an iron plate, the printed circuit board 15 has a sufficient strength when the claw portion 8b is hooked, and an effect of shielding the leakage magnetic field of the ring-shaped magnet 13 can be obtained.

[0017]

According to the present invention, when an insulator of a laminated core is coated and manufactured by resin molding, a claw portion is provided on a part of the insulator so that the stator can be temporarily fixed only by inserting it into a printed circuit board. Therefore, the number of parts and man-hours are reduced, and the price can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a drum motor showing an embodiment of the present invention,

FIG. 2 is a vertical sectional front view of a core assembly showing an embodiment of the present invention;

FIG. 3 is a bottom view of the core assembly showing the embodiment of the present invention.

[Explanation of symbols]

7 ... laminated core, 8 ... insulator, 10 ... core assembly, 1
DESCRIPTION OF SYMBOLS 1 ... Rotor assembly 15 ... Printed circuit board, 19 ... Board assembly, 20 ... Stator assembly

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Mitsuru Shibata 1410 Inada, Katsuta-shi, Ibaraki Tokai Electronics Co., Ltd. (72) Ryuichi Onuki 1410 Inada, Katsuta-shi, Ibaraki Tokai Electronics Co., Ltd. (72) Inventor Koji Kakurai 1410 Inada, Katsuta City, Ibaraki Prefecture Tokai Electronics Co., Ltd.

Claims (3)

[Claims] 1. A rotor assembly formed by magnetizing a magnet installed on the inner peripheral surface of a case, a core assembly wound around a laminated core facing the magnet to form a drive coil, and a printed circuit board. The Hall effect element that detects the magnetic field of the magnet and the connection part of the drive coil terminal,
Also, in a drum motor including a substrate assembly having a plug or the like for external connection installed, an insulating layer applied to the surface of the laminated core is covered with a molding resin and a part of the insulating layer is extended to form a plurality of claw portions. A drum motor, wherein the drum motor is integrally provided, and the claw portion is inserted and locked in a hole provided in the printed circuit board. 2. The plurality of claws integrally formed with the insulating layer on the laminated core according to claim 1, when the claws are slightly inserted and locked in holes provided in the printed circuit board. There is a rattling, and it is set so that the centers of the respective parts are substantially aligned with each other, and after the coil end is connected to the printed circuit board to form a stator assembly, when it is fixed to the fixed drum with screws, A drum motor in which the center of the core assembly follows the center of the fixed drum and is firmly assembled. 3. The drum motor according to claim 1, wherein the printed circuit board is an iron board.