JPH0629355U - motor - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the rotor magnet is magnetized, it will not be demagnetized even if fitted and fixed to the case, and the assembly accuracy will be improved. [Structure] The yoke member 3 is provided in the case 17 made of a magnetic material.
A magnet set 31 to which the magnet 16 is fixed is arranged at 0, and the magnet 16 is magnetized in the state of the magnet set 31. [Effect] It is possible to prevent the demagnetizing action of the magnet when it is slidably fixed to the case. further,
Since no dust or the like is generated when the slide is firmly fixed, it is possible to prevent the attachment to the magnet. Further, since the yoke member has a function of protecting the magnet, the magnet can be prevented from being damaged, and the handling becomes easy, so that the automatic assembly becomes possible.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a motor having a case provided with a magnet.

[0002]

[Prior art]

 In this type of motor, a magnet is provided in a case made of a magnetic material, for example, for a rotor, and the outer circumference of the salient poles of the core that constitutes the stator is opposed to the magnet so as to urge the rotor to rotate.

FIG. 2 shows, as an example of the above motor, a spindle motor of a peripheral surface facing type. 2, in the motor 1, a rotary shaft 6 is rotatably supported by bearings 4 and 5 fitted in a hole 3 of a housing 2 made of a non-magnetic material. Further, an inner circumference of a stator core 8 around which a coil 7 is wound is fixed to the housing 2. A rotor 11 is fixed to the upper end 9 of the rotating shaft 6, and a magnetic disk mounting plate 10 is connected to the rotor 11. The entire motor 1 is fixed to the chassis 13 with screws 14 via the flange portion 12 of the housing 2. A circuit board 15 to which various electronic components are attached is fixed to the lower surface of the housing 2 by fixing means such as screws (not shown).

The rotor 11 is composed of a rotor magnet 16 and a rotor case 17, and the rotor magnet 16 is fitted and fixed to the inner peripheral surface of the rotor case 17 formed in a substantially dish shape. The central portion of the rotor case 17 is integrally formed in the magnetic disk mounting plate 10 in an embedded manner as shown in the figure, and is also integrally mounted to the mounting plate 10 with screws or the like. When magnetizing the rotor magnet 16, the rotor magnet 16 is first mounted on a jig such as the back yoke 20 as shown in FIG. 3A, and in this state, as shown in FIG. 2), the magnetizing head 21 is inserted into the rotor magnet 16 to alternately magnetize the NS poles in the circumferential direction. Thereafter, as shown in FIG. 3C, the rotor case 17 having the inner surface coated with the adhesive in advance is brought into contact with the recess 20a of the back yoke 20, and the rotor magnet 16 is separated from the back yoke 20 in the direction of the arrow. Both are fitted and fixed to the inner circumference of the rotor case 17. Then, the rotor case 17 is detached from the recess 20a of the back yoke 20.

On the other hand, a position detector 18 such as a Hall element is arranged on the chassis 13 facing the rotor magnet 16, and the position detector 18 detects the rotational position of the rotor magnet 16 and detects this. The energization of the coil 7 of the stator core 8 is switched and controlled based on the rotational position signal from the device 18, and the rotor of the motor 1 is rotationally biased. Reference numeral 21 is a magnetic disk, and 22 is a clamper for mounting the magnetic disk 22.

[0006]

[Problems to be solved by the device]

 However, if the rotor magnet 16 is mounted on the back yoke 20 of the jig and magnetized and then slid into the rotor case 17 to be fitted and fixed, the rotor magnet 16 is demagnetized when sliding. There is a point. In addition, generation of magnetic powder on the surface of the magnet 16 and iron powder on the surface of the back yoke 20 or abrasion powder of the rust preventive coating on the surface of the rotor case 17 generated during the sliding is magnetized. Since the magnet 16 is attracted to the outer periphery of the magnet 16 and the magnet 16 and the rotor case 17 are interposed between the magnet 16 and the rotor case 17, they cannot be assembled accurately.

The present invention has been made in order to solve such a problem, and even if the rotor magnet is magnetized and fitted and fixed to the case, it is not demagnetized, and the assembling accuracy is good. It is an object of the present invention to provide a motor that can

[0008]

[Means for Solving the Problems]

 The present invention is characterized in that a case made of a magnetic material is provided with a magnet set having a magnet fixed to a yoke member, and the magnet is magnetized in the state of the magnet set.

[0009]

[Action]

 When the magnet is attached to the yoke member and magnetized in the state of a magnet set, and when this magnet set is fixed to the case, the yoke member is fixed to the magnet when slidingly fixed to the case. Therefore, demagnetization of the magnet is prevented. Further, no dust or the like is generated when the slide is fixed, and the attachment to the magnet is prevented. Further, since the magnet is protected by the yoke member, damage is prevented and handling is facilitated, so that automatic assembly is possible.

[0010]

【Example】

 Embodiments of a motor according to the present invention will be described below with reference to the drawings. The same reference numerals as those used in the above-described embodiment denote the same parts, and detailed description thereof will be omitted. In FIG. 1, a magnet set 31 having a magnet 16 fixed to a yoke member 30 is arranged in the case 17 made of the magnetic material described above, and the magnet 16 is magnetized in the state of the magnet set 31. That is, in the direction in which the driving force of the annular magnet 16 is obtained, that is, in the outer peripheral side of the magnet 16, an annular magnetic metal material having an L-shaped cross section as shown in FIG. The yoke member 30 made of is fixed to form a magnet set 31.

As shown in FIG. 1B, the magnet set 31 is mounted on a jig such as the back yoke 20. In this state, the magnetizing head 21 is inserted into the magnet 16 to circumferentially move the NS pole. Are alternately magnetized. Then, as shown in FIG. 1C, the rotor case 17 having the inner surface previously coated with the adhesive is brought into contact with the back yoke 20, and the magnet assembly 31 is slid away from the back yoke 20 in the direction of the arrow. , Is fitted and fixed to the inner circumference of the case 17. At this time, the portion where the magnet set 31 slides with respect to the inner peripheral surface of the back yoke 20 and the inner surface of the case 17 is the yoke member 30. Is prevented. Then, as shown in FIG. 1D, the rotor case 17 is removed from the back yoke 20 to complete the rotor set, and the rotor set is incorporated into the rotor of the motor 1 described above.

The above embodiment shows an example applied to a so-called outer rotor type motor in which the inner circumference of the magnet 16 is magnetized and the stator core 8 is opposed to the inner circumference. However, in addition to this example When applied to an inner rotor type motor, the yoke member 30 may be fixed to the inner circumference of the magnet 16 to form a magnet set, and the outer circumference of the magnet 16 may be magnetized. When applied to a plane-opposed motor, if the yoke member 30 is fixed to the magnet 16 to form a magnet group and the end surface of the magnet 16 is magnetized, as in the example of FIG. Well, it can be appropriately applied depending on the type of motor.

It should be noted that the above-mentioned motor is an example, and if the motor has a structure in which a magnet is fixed to a case made of a magnetic material, the magnet and the yoke member should be structured according to the type of the motor. Of course, various modifications can be made without departing from the gist of the present invention.

[0014]

[Effect of device]

 As is apparent from the above description, according to the motor of the present invention, the magnet is attached to the yoke member so as to be magnetized, and the magnet set is attached to the case. As a result, it is possible to prevent the demagnetizing action of the magnet when it is fixed by sliding to the case. Furthermore, since dust or the like is not generated when the slide is fixedly attached, it is possible to prevent the attachment to the magnet. Further, since the yoke member has a function of protecting the magnet, it is possible to prevent the magnet from being damaged, and there is an advantage that automatic assembly is possible because handling is easy.

[0015]

[Submission date] May 14, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

FIG. 2 shows a circumferentially opposed spindle motor as an example of the motor. In FIG. 2, in the motor 1, a rotary shaft 6 is rotatably supported by bearings 4 and 5 fitted in a hole 3 of a housing 2 made of a non-magnetic material. Further, an inner circumference of a stator core 8 around which a coil 7 is wound is fixed to the housing 2. A rotor 11 is fixed to the upper end 9 of the rotary shaft 6, and a magnetic disk mounting plate 10 is connected to the rotor 11. The entire motor 1 is fixed to the chassis 13 with screws 14 via the flange portion 12 of the housing 2. A circuit board 15 to which various electronic components are attached is fixed to the lower surface of the housing 2 by fixing means such as a screw (not shown).

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

The rotor 11 includes a rotor magnet 16 and a rotor case 17, and the rotor magnet 16 is fitted and fixed to the inner peripheral surface of the rotor case 17 formed in a substantially dish shape. The central portion of the rotor case 17 is integrally formed in the magnetic disk mounting plate 10 in an embedded manner as shown in the figure, and is also integrally mounted to the mounting plate 10 with screws or the like. When magnetizing the rotor magnet 16, the rotor magnet 16 is first attached to a jig such as the back yoke 20 as shown in FIG. The magnetizing head 21 is inserted through the magnets and the NS poles are magnetized alternately in the circumferential direction. Thereafter, as shown in FIG. 3 (B) , the rotor case 17 having the inner surface previously coated with the adhesive is brought into contact with the recess 20a of the back yoke 20, and the rotor magnet 16 is separated from the back yoke 20 in the direction of the arrow. At the same time, it is fitted and fixed to the inner circumference of the rotor case 17. Then, as shown in FIG. 3C, the rotor case 17 is detached from the recess 20a of the back yoke 20.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration example of a magnet assembly of a motor according to the present invention.

FIG. 2 is a cross-sectional view showing a known motor.

FIG. 3 is a sectional view showing a magnet of a conventional motor.

[Explanation of symbols]

 1 motor 16 magnet 17 case 30 yoke member 31 magnet assembly

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[Procedure amendment]

[Submission date] May 14, 1993

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (1)

[Scope of utility model registration request] 1. A motor in which a magnet set in which a magnet is fixed to a yoke member is disposed in a case made of a magnetic material, and the magnet is magnetized in the state of the magnet set.