JPH0467755A - Motor - Google Patents

Abstract

PURPOSE:To set the relative position between a rotor and the stator precisely by regulating the relative position of the stator to the rotor with protrusions, provided in one united body on either one or both of the stator end the opposite stationary part, to which the stator is fixed. CONSTITUTION:Bearings 2 supporting a rotation shaft 1 are inserted into the motor frame 4 to which a stator 3 has been fitted, and fixed in a vertical state. The position of the stator 3 is adjusted in the axial direction by a spacer 5, and it is fixed at the same position as the bearings 2 on the motor frame 4, and inside its iron core 3a a plurality of coils are wound. On this occasion, the stator 3 is fixed to the motor frame 4 by press-fitting the peripheral part of the iron core 3a to a plurality of protruding parts 7, provided circularly at intervals and formed in one united body at positions of the outermost peripheral diameter of the iron cores 3a of the motor frame 4. And this makes it possible to set the relative position between the rotor and stator precisely, as the protruding parts regulate the axial or radial position of the stator to a rotor 9.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an electric motor, particularly an electric motor that rotates a recording medium of a magnetic recording device having a magnetic head for reading and writing magnetic recording signals on a recording medium such as a disc-shaped magnetic disk. Regarding.

[Prior Art] The above-mentioned conventional electric motor of this type is, for example, the
The configuration is as disclosed in Japanese Patent No. 5863. That is, as shown in FIG. 19, a rotating shaft 31 to which a hub 30 for rotating a magnetic disk is fitted and fixed is a cylindrical bearing fixed to a frame 32 via two bearings on the hub side and on the opposite side. It is rotatably held by a boulder 33.

A stator 34 having a donut-shaped iron core is fixed to the outside of the bearing holder 33 with a frame 32 sandwiched therebetween by screws.
A coil 35 is wound around the iron core. A yoke 37, which has a driving permanent magnet 36 fixed to the inner circumferential surface facing the stator 34, is screwed to the opposite end of the rotating shaft 31 to form a rotor 38. The driving permanent magnet 36 generates magnetic force in the radial direction, and the coil 3 wound around the iron core of the stator 34
A rotational torque is generated by the current applied to 5.

During assembly, the rotor 38 is fitted to the rotating shaft 31 supported by a bearing in the bearing holder 33, and the stator 34 is fitted to the outer diameter of the bearing holder 33.
It is easy to obtain concentricity between the rotor 38 and the rotor 38, and the relative positional relationship between the rotor 38 and the stator 34 can be determined with high accuracy.

This electric motor is called an external rotation type in which the rotor 38 is located outside the stator 34, and the magnetic flux of the index detection magnet is detected by an index detection element, and based on this, the iron core of the stator 34 is The wound coil 35 is energized and driven to rotate.

“Problems to be Solved by the Invention” In the conventional electric motor described above, the rotor 38 is located outside, and the magnetic head that moves linearly in the radial direction with respect to the recording medium cannot be placed in a plane position of the rotor 38. First, because it is difficult to measure the thinness of magnetic recording devices, inner-rotation type electric motors, in which the rotor is inside the stator, are increasingly being used in magnetic recording devices.However, the conventional outer-rotation type In this method, it is not possible to determine the relative position of the internal rotor and stator, and the stator is fixed to a frame such as a board by screws without any special measures.

This invention was made in order to solve the problems of the conventional art, and its purpose is to obtain an inner-rotation type electric motor that makes it easy to determine the relative position of the rotor and the identifier, and that can contribute to making the magnetic recording device thinner. do.

[Means for Solving the Problems] An electric motor according to the present invention has a rotatably supported rotary shaft and a link-shaped driving permanent magnet that generates magnetic force in the radial direction, and is integrated with the rotary shaft. The rotor is equipped with a rotor that rotates by a rotor, and a stator placed outside the rotor, which has multiple coils wound around an iron core and generates rotational force in the rotor through magnetic interaction with a driving permanent magnet. The relative position of the stator with respect to the rotor is defined by a protrusion integrally provided on either or both of the stator and the fixed partner to which the stator is fixed.

Another electric motor of the present invention includes a rotatably supported rotary shaft, a ring-shaped driving permanent magnet that generates magnetic force in the radial direction, and a rotor that rotates integrally with the rotary shaft. It is equipped with a stator placed outside the rotor, which has multiple coils wound around an iron core and generates rotational force in the rotor through magnetic interaction with a driving permanent magnet. The relative position of the stator with respect to the rotor in the axial direction is defined by a protrusion formed on a part of the iron core.

[Operation] In the present invention, the axial position or centerline position of the stator with respect to the rotor is defined by the protrusion, and the relative position between the rotor and the stator can be determined with high precision. .

[Example] FIG. 1 and FIG. 2 both show an example of the present invention.
This is an electric motor called an internal rotation type in which the rotor is located inside the stator and rotates together with the rotating shaft. In FIGS. 1 and 2, a bearing body 2 that rotatably supports a rotating shaft 1 in the center is vertically fitted into a motor frame 4 made of a flat metal substrate to which a stator 3 is attached. Fixed.

The stator 3 has its axial position adjusted by a spacer 5 and is fixed in a coaxial position with the bearing body 2 on the motor frame 4, and a plurality of coils 6 are wound inside the iron core 3a. The stator 3 is fixed to the motor frame 4 by fixing the iron core 3a to a plurality of protrusions 7 that are integrally formed at the outermost diameter position of the iron core 3a of the motor frame 4 and spaced apart in the circumferential direction.
This is done by press-fitting the outer diameter part of the The coil 6 is wound around the core teeth obtained by equally dividing the inner circumference of the core 3a, and when turned, the core 3a corresponding to several consecutive core teeth is wound.
The inner diameter portion is formed as a bridge portion 3b. That is,
The outer periphery of the portion of the iron core 3a where the coil 6 is missing is formed as a recessed portion 3C that recedes toward the inner periphery. Inside the stator 3, a ring-shaped rotor yoke 8 made of ferromagnetic metal or a rotor 9 integrated with a hub press-fitted into the rotating shaft 1 is disposed, and the stator of the rotor yoke 8 A ring-shaped driving permanent magnet 10 is mounted on the outer circumferential surface opposite to the inner circumferential surface of the magnet 3 .

In applying the above-described electric motor to a magnetic recording device, a magnetic head (not shown) is provided on a support shaft fixed to the motor frame 4 via a member or the like so as to be linearly movable by means of a sliding member. At this time, the moving line of the magnetic head is aligned with the recess 3c of the iron core 3a, and the rotor 9. The stator 3 and the magnetic head are arranged substantially in the same plane. Thereby, it is possible to easily achieve a thinner magnetic recording device.

During assembly, the radial position of the stator 3 with respect to the rotor 9 is defined by the protrusion 7, so that alignment between the rotor 9 and the stator 3 can be easily achieved, and the rotor 9 and the stator 3 can be accurately aligned.
The relative position can be determined.

3 to 18 show other embodiments for determining the relative position of the rotor 3 and the stator 3 in the radial direction.

The one shown in FIG. 3 has a leg-shaped protrusion 7a formed by bending a part of the iron core 3a on the outer periphery of the iron core 3a, and a fitting hole 11 formed in the motor frame 4 at the tip end of the protrusion 7a. Then, the iron core 3a is fixed to the motor frame 4 with the screws 12 with the spacer 5 in between.

FIG. 4 shows the embodiment shown in FIGS. 1 and 2 in which the iron core 3a is fixed by press fitting to the motor frame 4 with a screw 12 with a spacer 5 in between, as in the above embodiment.

5 to 10 each have a plurality of holes spaced apart in the circumferential direction that are integrally formed at both the outermost circumferential diameter position and the inner circumferential diameter position of the iron core 3a of the motor frame 4. The position of the iron core 3a is defined by the protrusions 7, 7b, which are arranged on the inside and outside, and the stator 3 is fixed by being press-fitted into the protrusions 7, 7b or screwed onto the motor frame 4.

Figures 11 to 13 show spacers 5 in each of the above embodiments.
A protrusion 7C5 formed by cutting and raising a part of the motor frame 4, a protrusion 7d integrally formed on the motor frame 4 side surface of the iron core 3a, or the iron core 3a.
The position of the stator 3 in the center line direction can be determined without requiring the spacer 5 as a separate part.

Furthermore, FIGS. 14 to 17 show an embodiment in which the radial position and axial position of the stator 3 are determined in parallel. FIG. 14 shows that a protrusion 7f is provided on the motor frame, a bottomed hole 13 into which the tip of the protrusion 7f fits is provided in the iron core 3a of the stator 3, and the protrusion 7f is fitted into the bottomed hole 13. Accordingly, the radial position and axial position of the stator 3 are defined.

Further, FIG. 15 shows that the leg-shaped protrusions 7g formed by bending a part of the iron core 3a are fitted into the fitting holes 14 provided in the motor frame 4, and the diameter of the stator 3 is The directional position and axial position are defined, and a stepped portion 15 is formed on the fitting side of the protrusion 7g to limit the fitting depth as shown in FIGS. 16 and 17. There is.

In FIG. 18, a spacer 5 is integrally provided with protrusions 16 and 17 that fit into the motor lem 4 and the iron core 3a, respectively, and the spacer 5 defines both the axial and radial positions of the stator 3. This is the configuration that will be used.

[Effects of the Invention] As is clear from the description of the embodiments, according to the present invention, the radial position of the stator with respect to the rotor is defined by the protrusion, and concentricity between the rotor and the stator is achieved. Easy,
This provides the effect of being able to determine the relative position of the rotor and stator with high precision.

According to another invention, the axial position of the stator relative to the rotor is defined by the protrusion, and the relative position of the rotor and stator can be determined with high precision, eliminating the need for a separate spacer and reducing the number of parts. This results in an electric motor that can contribute to making magnetic recording devices thinner.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an electric motor as an embodiment of the present invention, Fig. 2 is a plan view thereof, and Figs. 3 and 4 are main parts of the electric motor showing other embodiments of the invention. 5 is a sectional view of the main parts of the electric motor showing another embodiment of the present invention, FIG. 6 is a plan view of the main parts of the motor shown in FIG. 5, and FIG. 7 is another embodiment of the invention. 8 is a plan view of the main parts of the motor shown in FIG. 7; FIG. 9 is a sectional view of the main parts of the motor showing another embodiment of the present invention; FIG. The figure is number 9
Plan views of the main parts of the electric motor shown in Figures 11, 12, and 1.
3 is a sectional view of a main part of an electric motor showing other embodiments of the present invention, FIGS. 14 and 15 are sectional views of main parts of a motor showing other embodiments of the invention, respectively, and FIG. and the 17th
The figures are an explanatory diagram of the A arrow part in Fig. 15, and the 1st
FIG. 8 is a sectional view of essential parts of a motor showing another embodiment of the present invention, and FIG. 19 is a sectional view of a conventional motor. In the figure, l is a rotating shaft, 3 is a stator, 3a is an iron core, 4 is a motor frame, 5 is a spacer, 6 is a coil, 7, 7a, 7b,
7c, 7d, 7f, 7g are protrusions, 8 is a rotor yoke,
9 is a rotor, 10 is a driving permanent magnet, 11.14 is a fitting hole, and 13 is a bottomed hole. Note that the same symbols in the figures refer to the same numbers.
or a corresponding portion. Agent Masuo Oiwa (and 2 others) r Rotating axis Figure 3 Figure 4 / 9/l111 Transfer Figure 7b Projecting eaves Figure Figure Figure! 3 Figure 1+1 7f Expenditure HF 2. Title of the invention 3. Figure 19 of the person making the amendment Written amendment (voluntary) Heisei-NMl &: 2 years] O+2 days Motive 5 Subject of amendment (2) Column for detailed explanation of the invention in the specification. (3) Drawings. 6. Contents of the amendment (1) From page 3, line 19 to page 4, line 1 of the specification, the statement ``The magnetic flux of the index detection magnet is changed to the intensity detection element'' has been changed to ``the field of the driving permanent magnet.'' The magnetic sensor corrects it. (2) "Position in center line direction" on page 6, line 4 of the specification
The description of is corrected to "radial position". (3) Figure 18 in one drawing will be corrected as shown in the attached sheet. that's all

Claims (2)

[Claims] (1) A rotor that has a rotatably supported rotary shaft, a ring-shaped driving permanent magnet that generates magnetic force in the radial direction, and rotates integrally with the rotary shaft, and a plurality of rotors on an iron core. In an electric motor, a stator is fixed to a frame such as a substrate on the outside of the rotor, and the stator has a coil wound thereon and generates rotational force on the rotor through magnetic interaction with the driving permanent magnet. Alternatively, an electric motor characterized in that the relative position of the stator with respect to the rotor in the radial direction is defined by a protrusion integrally provided on one or both of the fixing partners to which the stator is fixed. (2) A rotor that has a rotatably supported rotary shaft, a ring-shaped driving permanent magnet that generates magnetic force in the radial direction, and rotates integrally with the rotary shaft, and a plurality of coils. In an electric motor, a stator is fixed to a frame such as a substrate on the outside of the rotor and generates a rotational force in the rotor by magnetic action with the permanent magnet for driving. Or to the iron core of the stator above,
An electric motor characterized in that a protrusion is formed to define a relative position of the stator with respect to the rotor in an axial direction.