JP3096072B2 - Magnetized yoke device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, magnetizing a driving magnet or a position detecting magnet used in a small DC brushless motor while maintaining the relative positions of the magnetic poles. For a magnetized yoke device.

[0002]

2. Description of the Related Art Conventionally, in a DC brushless motor,
In order to detect the rotation of the rotor, such as the rotation position and the number of rotations, it is constituted by a detection magnet provided integrally with the rotor and detection means such as a magnetic sensor disposed opposite to the detection magnet. The rotor driving magnet and the detection magnet are substantially separate bodies, and are magnetized by separate magnetizing operations in a predetermined magnetic pole pattern.

[0003] In the operation of magnetizing such a magnet, the driving magnet and the detecting magnet need to be positioned at predetermined positions and matched with each other. That is, the driving magnet is magnetized in advance, the magnetic pole is marked at a predetermined position, and then the detection magnet is magnetized in a state where the magnet matches the marking.

[0004]

However, in such a magnetizing method, it is necessary to accurately position the detection magnet. For this reason, the processing is complicated, which has caused a rise in manufacturing costs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has as its main object to have substantially a plurality of magnetized magnets such as a drive magnet and a detection magnet integrally provided on a rotor. An object of the present invention is to provide a magnetized yoke device in which the magnetized magnetic poles of the respective magnets can be accurately and easily performed according to a predetermined positioning, and can be efficiently magnetized.

[0006]

According to the present invention, a driving magnet for obtaining a rotational driving force in cooperation with an armature coil constituting a motor, and a detecting magnet used for detecting a rotational speed or a rotational angular position. A magnetized yoke device for magnetizing the magnet for detection in a rotor having: a magnetic yoke body made of a magnetic material; and a magnetic yoke body disposed on the magnetic yoke body, wherein the rotor is attached to the magnetic yoke body. Support means for supporting the rotor in a concentric manner and relatively rotatably with respect to the drive magnet in the magnetic yoke body; Positioning magnetic means for holding the motor at a predetermined rotation position, and a magnetic head disposed at a position opposed to the detection magnet in the magnetic yoke body, wherein the rotor is positioned by the positioning magnetic means. And magnetizing line for generating a magnetic pole pattern in the detecting magnet in a state of being held in the rotational position,
And a magnetized yoke device provided with:

[0007]

In the magnetized yoke device according to the present invention, the rotor rotatably supported by the magnetic yoke body is held at a predetermined rotational position by the attraction or repulsion of the driving magnet and the positioning magnetic means. . Since the positioning magnetic means and the magnetized electric wire for magnetizing the detection magnet are arranged on the same member, the detection magnet is always magnetized in a state where predetermined positioning with respect to the drive magnet is completed. You.

[0008]

FIG. 1 is a sectional view showing a first embodiment of a magnetized yoke device according to the present invention.
5 shows a state in which a rotor having an unmagnetized magnet to be magnetized is mounted. This rotor is a small DC brushless motor and is incorporated in a rotating shaft type. As shown in FIG. 1, the rotor 5 has a cup-shaped rotor yoke 54 having a flange portion 56 at an open end, a driving magnet 52 provided on the inner surface thereof, and a detection magnet provided at a lower end surface of the flange portion 56. 53 are provided, and a shaft 51 is provided at the center. The driving magnet 52 functions as a main magnetic pole that obtains a rotational driving force in cooperation with an armature coil when assembled as a motor, and the detection magnet 53 operates when the rotor 5 rotates ( Or rotation angle position), and serves as a detection magnetic pole for detecting the drive magnet 52 and the detection magnet 53.
Need to be positioned at predetermined positions and matched. In this embodiment, in such a rotor 5, the driving magnet 52 is already magnetized in a predetermined magnetizing pattern,
The detection magnet 53 performs positioning in accordance with the magnetized magnetic poles of the drive magnet 52, and then performs magnetization.

The magnetized yoke device 1 of this embodiment includes a magnetic yoke 2, support means, magnetic means, and magnetized electric wires. In FIG. 1, the magnetic yoke 2 is formed of an iron material such as a ferromagnetic material, a laminated electromagnetic steel plate, or the like. The magnetic yoke 2 has a large-diameter portion 22 existing at a lower portion and a small-diameter portion 21 existing at an upper portion, and its outer shape has a predetermined shape corresponding to the inner peripheral surface shape of the rotor 5 (large diameter). The portion 22 faces the flange portion 56 of the rotor 5 and the small diameter portion 21 faces the driving magnet 52). In the small diameter portion 21, a through hole 23 is formed in a shaft core portion, bearing means 61 and 62 (constituting a support means) are fixed, and a positioning permanent magnet 71 is provided on the outer peripheral surface facing the detection magnet 53. (Constituting magnetic means) is buried.
The magnetized electric wire 7 for magnetizing the detection magnet 53 is buried in the flat surface 32 of the large diameter portion 22 so as to form a winding loop of a predetermined number of magnetic poles in the circumferential direction. The magnetic pole of the positioning permanent magnet 71 is the magnetic yoke 2 of the magnetized electric wire 7.
Of the large-diameter portion flat surface 32, that is, the magnetized pole face of the detection magnet 53.

In such a magnetized yoke device 1, the shaft 51 of the rotor 5 is connected to the bearing means 61 and 62.
And the rotor 5 is rotatably supported with respect to the magnetic yoke body 2, the positioning permanent magnet 71 and the driving magnet 5
Due to the attraction or repulsion with the rotor 2, the rotor 5 rotates and is magnetically held at a predetermined magnetized position. Then, if a required magnetizing electric power is supplied to the magnetized electric wire 7 in this holding state, the magnetized for positioning is obtained in the detecting magnet 53 with respect to the driving magnet 52.

Next, a description will be given of a second embodiment of the magnetized yoke device according to the present invention. FIG. 2 is a cross-sectional view showing a second embodiment of the magnetized yoke device according to the present invention. As in the first embodiment, a magnet-equipped rotor having unmagnetized magnets to be magnetized is mounted. Indicates a state in which The rotor of this embodiment has a driving magnet and a detection magnet similarly to the rotor of the first embodiment, and is magnetized by the detection magnet.
Since it is a small DC brushless motor incorporated in a fixed shaft type, it has a hollow cylindrical shape without a shaft.

The magnetized yoke device 1 of this embodiment comprises a magnetic yoke 2, support means, magnetic means, and magnetized electric wires. In FIG. 2, the magnetic yoke body 2 is formed of an iron material such as a ferromagnetic material, a laminated electromagnetic steel plate, or the like, and a magnetized electric wire 7 for magnetizing the detection magnet 53 is provided in a predetermined direction in the circumferential direction. It is buried so as to form a winding loop for the number of magnetic poles. A centering jig 8 is fitted into the shaft core of the magnetic yoke body 2, and a tip 8 of the centering jig 8 is provided.
1, a rotor support member 9 is further fitted, and these are integrally fixed. A permanent magnet 71 for positioning (constituting magnetic means) is embedded in the step-shaped outer peripheral surface 92 of the rotor support member 9, and this magnetic pole is detected by the magnet 5 for detection.
3 is arranged in conformity with the magnetized magnetic pole face. In this embodiment, the centering member 8, the rotor support member 9, and the bearing member 6
Constitute support means.

A predetermined number of segment-shaped driving magnets 52 are provided on the inner peripheral surface of the cylindrical portion 55 of the rotor 5, and a detecting magnet is provided on the lower end surface of the flange portion 56 of the rotor yoke 54. 53 are provided.

In such a magnetized yoke device 1, the upper inner peripheral surface of the rotor 5 is gently fitted into the outer peripheral portion of the bearing member 6, and the rotor 5 is rotatably supported by the rotor support member 9. Then, the rotor 5 is settled and held in a predetermined positional relationship by the attraction or repulsion between the driving magnet 52 and the positioning permanent magnet 71.

When a required magnetizing electric power is supplied to the magnetized electric wire 7 in this holding state, a magnetic pole is generated on the magnetized surface 32 of the detecting magnet 53 on the magnetic yoke body 2 and opposed to the magnetic pole. The arranged detection magnet 53 is magnetized. Also in this case, similarly to the first embodiment, the driving magnet 52 and the detecting magnet 5 are used.
Magnetization in a state where the magnetic pole is positioned with respect to No. 3 is obtained.

As described above, in the magnetized yoke device according to the present embodiment, the magnetized magnetic pole positioned at a predetermined position can be easily formed on a plurality of discontinuous magnetized surfaces integrally provided on the rotor. Can be generated. Although the embodiments of the magnetized yoke device according to the present invention have been described above, the present invention is not limited to such embodiments, and various modifications and corrections can be made without departing from the scope of the present invention.

For example, in the present embodiment, the rotor 5 to be magnetized has a rotor yoke 54 and a driving magnet 52,
Although the structure in which the detection magnet 53 is provided is shown, for example,
The entire rotor 5 may be integrally configured with magnets, and further, may be configured to include the shaft 51, and a plurality of discontinuous magnetizations may be performed at required locations. Also, the shape of the magnetic yoke 2
The material used can be freely selected. Further, if the magnetized electric wire 7 is a single circuit, the wiring on the magnetic yoke 2, the layout, the magnetic pole pattern and the number of magnetic poles can be freely changed in design. In addition,
Like the bearing members 6, 61, 62, etc., the magnetic yoke body 2 is mounted using two bearing members, but may be configured as one. It goes without saying that the type of bearing is also freely selectable. Furthermore, although a permanent magnet is used as the magnetic means in the embodiment, an electromagnetic magnet may be used instead.

[0018]

According to the present invention having the above-described structure, the following effects can be obtained. A magnetizing yoke that can efficiently and easily magnetize driving magnets, detecting magnets, and the like, which are disposed integrally with the rotor, on magnetized magnetic poles at predetermined positions, and perform efficient magnetizing work. A device is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a magnetized yoke device according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of the magnetized yoke device according to the present invention.

[Explanation of symbols]

 2 Magnetic yoke body 5 Rotor 6, 61, 62 Bearing member 7 Magnetized wire 8 Centering member 9 Rotor support member 52 Driving magnet 53 Detection magnet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-113906 (JP, A) JP-A-59-216453 (JP, A) JP-A-59-159652 (JP, A) 240844 (JP, A) JP-A-63-127512 (JP, A) JP-A 64-45477 (JP, U) JP-A 60-138370 (JP, U) JP-B 63-127512 (JP, B2) JP-B-62-9201 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 15/03 H02K 1/27 H02K 29/00-29/14 H01F 13/00

Claims (1)

(57) [Claims] 1. A detecting magnet in a rotor having a driving magnet for obtaining a rotational driving force in cooperation with an armature coil constituting a motor, and a detecting magnet used for detecting a rotation speed or a rotation angle position. A magnetized yoke device for magnetizing, comprising: a magnetic yoke body made of a magnetic material; and a magnetic yoke body disposed on the magnetic yoke body, wherein the rotor is concentric with and relative to the magnetic yoke body. A supporting means for rotatably supporting the magnetic yoke, and a supporting means disposed at a position facing the driving magnet in the magnetic yoke for magnetically holding the rotor at a predetermined rotational position with respect to the magnetic yoke. And a magnetic unit for positioning, which is disposed at a position facing the magnet for detection in the magnetic yoke body, in a state where the rotor is held at a predetermined rotational position by the magnetic unit for positioning. Magnetizing yoke apparatus characterized by comprising a, a magnetizing wire for producing a magnetic pole pattern in the serial detecting magnet.