JPH04244767A - Magnetized yoke - Google Patents

Abstract

PURPOSE:To obtain magnetization according to a predetermined pole pattern by one magnetizing operation and to eliminate a work for positioning a magnetizing wire by mounting a magnet body integrally having a driving magnet and a detecting magnet at a magnetizing yoke. CONSTITUTION:A driving magnet 52 and a detecting magnet 32 are provided on a magnetic yoke 2, and brought into contact with discrete magnetizing surfaces. When a predetermined power is supplied to a magnetizing wire 3, a predetermined pole pattern is generated, thereby magnetizing the magnet 52 and the magnet 53. The magnet 52 corresponds to a first magnetizing part of the wire 3, is magnetized as required by the first part, and operated as a function of a main pole. The magnet 53 corresponds to a second magnetizing part of the wire 3, magnetized by the second part, and operated as a function of a detecting pole for detecting the rotating speed of a rotor 5.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention magnetizes drive magnets and position detection magnets used in, for example, small DC brushless motors while maintaining the relative positional relationship of their magnetic poles. The present invention relates to a magnetizing yoke device for.

0002

[Prior Art] Conventionally, in DC brushless motors,
In order to detect rotation such as rotor rotation position and rotation speed,
It is composed of a detection magnet integrally disposed on the rotor and a detection means such as a magnetic sensor disposed opposite to the detection magnet. The rotor drive magnet and the detection magnet are substantially separate bodies, and are each magnetized by separate magnetization operations using predetermined magnetic pole patterns.

[0003] In the work of magnetizing such a magnet, the driving magnet and the detection magnet are positioned at predetermined positions.
Since it is necessary to match, this is usually done as follows. That is, the driving magnet is magnetized in advance, the magnetic pole is marked at a predetermined positioning location, and then the detection magnet is magnetized in a state where it matches the marking.

0004

However, in such a magnetization method, it is necessary to accurately position the detection magnet. For this reason, processing is complicated and causes an increase in manufacturing costs.

The present invention has been made in view of the above facts, and its main purpose is to provide a rotor having substantially a plurality of magnetized magnets, such as driving magnets and detection magnets, which are integrally arranged on the rotor. It is an object of the present invention to provide a magnetizing yoke device which enables efficient magnetization of a magnet body by accurately and easily magnetizing magnetic poles according to predetermined positioning.

[0006]

[Means for Solving the Problems] According to the present invention, a magnetizing yoke device includes a magnetic yoke body for magnetizing a magnet body and a magnetizing electric wire for generating a predetermined magnetic pole pattern. The magnetized electric wire includes a first magnetized portion for magnetizing a main magnetic pole that cooperates with an armature coil to obtain rotational driving force, and a detection magnetic pole used for detecting the rotational speed or rotational angular position. A magnetizing yoke device is provided, which includes a second magnetizing section for magnetizing. Further, a magnetic yoke body for magnetizing the magnet body, a magnetizing wire for generating a predetermined magnetic pole pattern, and a magnetic yoke body for rotatably supporting the magnet body relative to the magnetic yoke body. There is provided a magnetizing yoke device comprising a support means and a positioning magnetic means for magnetically holding the magnet at a predetermined position.

[0007]

[Function] In the magnetizing yoke device according to claim 1, the magnetizing wire is connected to the first magnetizing section for magnetizing the main magnetic pole so as to generate two or more magnetized surfaces in one circuit, and for detection. Since it has a second magnetizing part for magnetizing the magnetic pole, for example, by attaching a magnet body in which a driving magnet and a detection magnet are integrally provided to the magnetizing yoke device, magnetization can be performed once. The operation results in magnetization according to each predetermined magnetic pole pattern. Furthermore, since the magnetized wires are arranged on the magnetic yoke body in a magnetic pole pattern that has been positioned in advance with respect to the magnets to be magnetized, no special positioning work is required.

Further, in the magnetizing yoke device of the second aspect, when the drive magnet is already magnetized in a predetermined manner, for example, and the detection magnet is to be magnetized while matching the position of this magnetic pole. When the magnet body is attached to the magnetic pole yoke body via the support means, the magnet body rotates due to the attraction or repulsion of the positioning magnet means provided in the magnetizing yoke device and the driving magnet, and the interaction between the two occurs. is maintained in a predetermined positional relationship. By performing the magnetization operation in this state, the detection magnet is magnetized in a predetermined position relative to the drive magnet.

[0009]

[Embodiment] Fig. 1 is a perspective view showing a first embodiment of a magnetizing yoke device according to the present invention, and shows a magnetizing yoke device for magnetizing a rotor magnet incorporated in a small DC brushless motor. . In FIG. 1, 1 indicates the entire magnetizing yoke device, 2 is a magnetic yoke body, 3 is a magnetizing electric wire, and 41 and 42 are power supply lines for supplying magnetizing power.

The magnetic yoke body 2 is made of an iron material such as a ferromagnetic material, a laminated electromagnetic steel plate, or the like. The magnetic yoke body 2 has a large diameter portion 22 at the bottom and a small diameter portion 21 at the top, and its outer shape has a predetermined shape corresponding to the shape of the inner peripheral surface of the rotor 5. The surface of the magnetic yoke body is coated or coated with a resin material to prevent the magnet from chipping or from adhering to magnetic particles due to shock vibrations caused by electromagnetic energy during magnetization. be.

[0011] The magnetized electric wire 3, which has one end connected to a power supply line 41, is arranged on the magnetic yoke body 2 according to a predetermined magnetic pole pattern, and the other end is connected to a power supply line 42, forming one circuit. There is. In FIG. 1, as an example, eight magnetic poles are generated on the small diameter portion 21, the large diameter portion 22, and the large diameter portion flat surface 32 on the magnetic yoke body 2.

FIG. 2 is a sectional view showing a state in which a rotor 5 to be magnetized (for example, a hub of a spindle motor) is attached in addition to the magnetizing yoke device 1 shown in FIG. In addition, in FIG. 2, the magnetized electric wire 3 and the power supply lines 41 and 42
has been omitted. And, for the same members used in Figure 1,
Similar numbers are attached. This also applies to FIGS. 3 and 4, which will be described later.

The rotor 5 is composed of a cup-shaped rotor yoke 54 and a shaft 51 fitted into the shaft core, which are integrally fixed. On the inner peripheral surface of the rotor yoke 54, a ring-shaped drive magnet 52 (more specifically, provided on the inner peripheral surface of the cylindrical portion 55) and a detection magnet 32 (more specifically, provided on one end of the cylindrical portion 55) are provided. (provided on the provided flange portion 56) is firmly fixed. The rotor 5 is held by being loosely fitted into the magnetizing yoke device 1 through the through hole 23, the shaft 51, the small diameter portion 21, and the driving magnet 52.

In FIGS. 1 and 2, the driving magnet 52 is fitted onto the small diameter portion 21 of the magnetic yoke body 2, and the detection magnet 32 is in contact with the flat surface 32 of the large diameter portion. That is, the drive magnet 52 and the detection magnet 32 are located on the magnetic yoke body 2, and are in contact with magnetized surfaces that are not continuous with each other.

The magnetized electric wire 3 includes the large diameter portion 22 of the magnetic yoke body 2, the large diameter portion flat surface 32 (the portion disposed on this flat surface 32 acts as a second magnetized portion), and the large diameter portion 32 of the magnetic yoke body 2. The small diameter portion 21 (a portion provided in the small diameter portion 21 acts as a first magnetized portion) is arranged to have the same magnetic pole pitch. When the required power is supplied to the magnetized wire 3, a predetermined magnetic pole pattern is generated, and the driving magnet 52 and the detection magnet 5
It is magnetized to 3. The driving magnet 52 is the first magnet of the magnetized wire 3.
The first magnetized portion corresponds to the magnetized portion, and is magnetized as required by this first magnetized portion, and when assembled as a motor, functions as a main magnetic pole that cooperates with the armature coil to obtain rotational driving force. Further, the detection magnet 53 corresponds to the second magnetized part of the magnetized electric wire 3, is magnetized by this second magnetized part, and when assembled as a motor, the number of rotations (or rotation angle position) of the rotor 5 is determined. ) functions as a detection magnetic pole to detect. Since each magnetized magnetic pole follows the magnetic pole pattern of the magnetized electric wire 3, the drive magnet 52 and the detection magnet 53 can be magnetized in a positioned manner.

In this embodiment, the drive magnet 52 and the detection magnet 53 are treated as having the same number of magnetic poles, but they may have a different number of magnetic poles. In this case, a magnetic pole pattern matching the desired number of magnetic poles may be formed using the magnetized wire 3 and disposed on the magnetic yoke body 2.

FIG. 3 is a sectional view showing a second embodiment of the magnetizing yoke device according to the present invention. Similar to the embodiment of FIG. 2, the rotor 5 is shown attached to the magnetizing yoke device 1. In this embodiment, for example, the driving magnet 52 (provided on the inner peripheral surface of the cylindrical portion 55 of the rotor yoke 54) that obtains rotational driving force of the rotor 5 is already magnetized with a predetermined magnetic pole pattern. Then, the detection magnet 53 (provided on the lower end surface of the flange portion 56 of the rotor yoke 54) for detecting the rotation speed (or angular position) is positioned according to the magnetized magnetic pole of the drive magnet 52. Magnetization is performed on the top.

In FIG. 3, bearing members 61 and 62 (constituting support means) are fixed to the through hole 23 in the shaft core of the magnetic yoke body 2. As shown in FIG. These bearing members 61 and 6
2, the shaft 51 of the rotor 5 is rotatably supported by the magnetic yoke body 2. Further, a positioning permanent magnet 71 (constituting magnetic means) is embedded in the small diameter portion 21 of the magnetic yoke body 2 so as to face the driving magnet 52 . The magnetic pole of the positioning permanent magnet 71 is connected to the magnetized electric wire 7.
If the rotor 5 is arranged so as to match the part arranged on the large diameter flat surface 32 of the magnetic yoke body 2 in , that is, the magnetized magnetic pole surface of the detection magnet, the rotor 5 can be aligned with the positioning permanent magnet 71 and the drive The rotor 5 is rotated and held in a predetermined positional relationship by attraction or repulsion with the magnet 52, and the rotor 5 is magnetically held in the magnetized position.

For example, the magnetizing wire 7 for magnetizing the detection magnet 53 is attached to the periphery of the large diameter portion 22 so as to generate a magnetic pole using the large diameter portion flat surface 32 of the magnetic yoke body 2 as a magnetizing surface. Winding loops for a predetermined number of magnetic poles are formed in the direction. Therefore, if the required magnetizing power is supplied to the magnetizing electric wire 7 while the rotor 5 is held in the above-described state, the detection magnet 53 can be magnetized in a position relative to the drive magnet 52.

FIG. 4 is a sectional view showing a third embodiment of the magnetizing yoke device according to the present invention, and shows a state in which the rotor 5 is attached to the magnetizing yoke device 1. In this embodiment, like the second embodiment, the driving magnet 52 is already magnetized.
A magnetizing yoke device is shown in which the detection magnet 53 is magnetized while positioning the magnetic pole of the drive magnet 52. In this third embodiment, the rotor 5 to be magnetized has a hollow cylindrical shape without a shaft, and is used, for example, in a fixed-shaft DC brushless motor.

In FIG. 4, a centering jig 8 is fitted into the axis of the magnetic yoke body 2, and a rotor support member 9 is fitted into the tip 81 of this centering jig 8. fixed in one piece. And the rotor support member 9
A bearing member 6 is attached to the tip end 91 of the rotor support member 9, and a positioning permanent magnet 71 (constituting magnetic means) is embedded in the stepped outer peripheral surface 92 of the rotor support member 9. In this embodiment, the centering member 8, the rotor support member 9, and the bearing member 6 constitute the support means.

A predetermined number of segment-shaped driving magnets 52 are arranged on the inner peripheral surface of the cylindrical portion 55 of the rotor 5.
Further, on the lower end surface of the flange portion 56 of the rotor yoke 54,
A detection magnet 53 is provided. The upper inner circumferential surface of the rotor 5 is loosely fitted into the outer circumference of the bearing member 6, and the rotor 5 is rotatably supported by the rotor support member 9. Due to the attractive force between the driving magnet 52 and the positioning permanent magnet 71, the rotor 5 settles and is held in a predetermined positional relationship.

When the required magnetizing power is supplied to the magnetizing electric wire 7, a magnetic pole is generated on the magnetized surface 32 of the detection magnet on the magnetic yoke body 2, and the detection magnet 53 disposed opposite to the magnetic pole is generated. It is magnetized. In this case as well, similarly to the second embodiment, magnetization can be achieved with the magnetic poles of the drive magnet 52 and the detection magnet 53 being positioned.

As described above, the magnetizing yoke device of this embodiment can easily move magnetized magnetic poles at predetermined positions to a plurality of substantially discontinuous magnetized surfaces integrally arranged on the rotor. can be generated. Although the embodiments of the magnetizing yoke device according to the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made without departing from the scope of the present invention.

For example, in this embodiment, the rotor 5 to be magnetized has a drive magnet 52 on the rotor yoke 54,
Although the structure in which the detection magnet 53 is arranged is shown, for example,
The entire rotor 5 may be constructed integrally with magnets, and may further include the shaft 51, and a plurality of discontinuous magnetizations may be performed at required locations. Further, the shape of the magnetic yoke body 2, the material used, etc. can be freely selected. Furthermore, magnetized wires 3 and 7
As long as it is one circuit, the wiring on the magnetic yoke body 2, the routing, the magnetic pole pattern, the number of magnetic poles, etc. can be designed freely. In addition,
Although two bearing members are used to attach the magnetic yoke body 2 to the magnetic yoke body 2, such as the bearing members 6, 61, 62, etc., a single bearing member may be used. It goes without saying that the type of bearing is also freely selectable. Furthermore, although permanent magnets are used as magnetic means in the embodiments, electromagnets may be used instead.

[0026]

Advantages of the Invention Since the present invention has the above-described configuration, it has the following effects. Magnetization that accurately and easily generates magnetization of drive magnets, detection magnets, etc. that are integrally arranged on the rotor to magnetized magnetic poles that are positioned in a predetermined manner, and enables efficient magnetization work. A yoke device is obtained.

[Brief explanation of the drawing]

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

FIG. 2 is a sectional view of the first embodiment.

FIG. 3 is a sectional view showing a second embodiment of the magnetizing yoke device according to the present invention.

FIG. 4 is a sectional view showing a third embodiment of the magnetizing yoke device according to the present invention.

[Explanation of symbols]

2 Magnetic yoke body 3 Magnetized wire 4 Bearing 5 Rotor 6 Bearing member 7 Magnetized wire 8 Centering member 9 Rotor support member 52 Driving magnet 53 Detection magnet

Claims (2)

[Claims] 1. A magnetic yoke body for magnetizing a magnet body, a magnetizing electric wire for generating a predetermined magnetic pole pattern,
In the magnetizing yoke device configured by A magnetizing yoke device comprising a second magnetizing section for magnetizing a detection magnetic pole used for detection. 2. A magnetic yoke body for magnetizing a magnet body, a magnetizing electric wire for generating a predetermined magnetic pole pattern,
A supporting means for rotatably supporting the magnet body relative to the magnetic yoke body, and a positioning magnetic means for magnetically holding the magnet body at a predetermined position. A magnetizing yoke device featuring: