JPS6220914A - Motor bearing - Google Patents

Abstract

PURPOSE:To make sure of the flotage of a rotary sleeve, by covering the outer side of a fixed shaft with the inverted cuplike rotary sleeve, and floating the rotary sleeve with each action of a permanent magnet and a stator yoke of the rotary sleeve. CONSTITUTION:A fixed shaft 2 is supported upright by a box body 1 via a seat part 2a, and the other end is made to come into a state of being opened. This fixed shaft is covered with an inverted cuplike rotary sleeve 3 so as to involve it, and there is provided with a gap of several microns between an outer circumference of the fixed shaft 2 and an inner circumference of an opening part 3a of the rotary sleeve 3. In and around the rotary sleeve 3, there is provided with a permanent magnet 4 which performs a magnetic formation for rotation by action of a stator yoke 5, while it has magnetic attraction for flotage of the rotary sleeve 3. That is to say, in a gap between the permanent magnet 4 and the stator yoke 5, there is produced the magnetic attraction with each other, so that the rotary sleeve 3 comes into a state of being floated out of the fixed shaft 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention is directed to a mirror or
The present invention relates to a motor bearing in a motor that is required to rotate at a very high speed, such as a scanning motor, and which also requires high rotation accuracy.

(Background of the Invention) For example, in motors that are required to rotate at extremely high speeds, such as mirror scanning motors for laser printers, and which require a high rotation W1 degree, the amount of liquid in contact type bearings is reduced. There is a need for a non-contact type bearing that supports the rotor by floating it using high H gas.

In these type of contact type bearings, liquid or gas is used to float the motor. A type holder is known in which air is supplied by natural intake by starting rotation.

However, while the external dimensions of the device are required to be smaller,
For example, in the case of a mirror scanning motor for a laser printer, a dynamic pressure type @ receiver that does not require an accessory device is preferred.

(Conventional Problems) Conventionally, in such a dynamic pressure type intermediate support, as shown in the 21st section, the fixing member 2 is attached to the inside of the broom body 1 through the seat portion 2a.
It has a permanent magnet 2h which levitates the rotating sleeve which is erected on the surface of the seat 2a-11.

Nucleus fixation@2 is encapsulated in a rotary slip (lotation slip).
A permanent magnet 4 for rotation is arranged at the center of the rotating sleeve 3, and a permanent magnet 4 for rotation is arranged at the lower part of the rotor in Fig. A permanent magnet 3b is disposed opposite to the floating permanent magnet 2b on the rotor side.

Furthermore, around the fixing member 2, there are grooves 2C that help the levitation and correspond to the gas flow velocity and direction during rotation.
There are rainbows.

A stator yoke 5 is provided inside the casing, facing the recirculation permanent magnet 4 disposed around the recirculation sleeve 3, and including an rll cocoil 5a.

In such a conventional example, since a pair of permanent magnets are required for R1 levitation, it leads to an increase in the number of component points, and also the influence of rotation during rotation, 4-force force, etc.
In order to avoid problems such as eccentricity of the rotor and sleeve due to mismatch of magnetic flux, do not compress or expand the gap between the lc"1% glaze and the glaze according to the direction of rotation. h; Flow of gas passing through, ・Controlling the flow velocity and levitation is a complicated process.・Machining of several microns is required. This caused inconvenience in processing.

In addition, when at a small temple, the rotating sleeve 3 does not float, and in the case of a dynamic pressure type, which floats after starting rotation, the rotating sleeve 3 does not float during the parking period. Sleeve 3・
If the opening part 3a is affected by the tako foot or drawer 2, or the contact 4 is worn out due to the hawk rubbing that occurs from the chiruike stop to the start of rotation 4, the contact 4 will be worn and cutting powder will be generated. was occurring.

Deafness (Purpose of Akira Haku) In view of the above-mentioned disadvantages, Akira Honbe's purpose was to eliminate the permanent magnet used exclusively for the levitation of the rotor, simplify the complicated structural processing, and furthermore, But stop l:4
Also, the purpose is to provide a clear reception of the motor so that the rotor floats up and is held in place even during rotation.

(Structure of the Invention) The above-mentioned q-l of the present invention consists of a motor complement, a fixation part fixed to the nucleus flute body and having the other end shaped like a single plate, and a nucleus fixation @ bent. 1I-1, which has the shape of an inverted cup that is proudly contained in the end song, and a permanent magnet is placed around the bottom of the opening of the rotor to support the side wire coil. This is achieved by having a stator yoke, which is supported on the inner periphery of the housing so as to face the permanent magnets, and which acts on the rotor A as a levitation force in addition to the rotational force. Ru.

(Embodiments of the Invention) Hereinafter, based on preferred actual examples of the present invention, '?' This will be explained with reference to page 1.

FIG. 1 is a spectral diagram of a mirror scanning motor for a laser printer showing one embodiment of the present invention.

1 is a dark book.

Reference numeral 2 denotes a fixing member, one end of which is supported vertically by the housing 1 via a seat portion 2af, and the bent end thereof is curved into a rounded shape 11.

31 ・The rotary sleeve IJ-7" with the ψ cup facing down is fixed. ``It covers the body 2 so as to focus on the inside, and when removed from the wooden embodiment," is the nucleus fixed. ・The outer periphery of 11112 and the opening of the rotating sleeve 3 Evil 3
There is a gap I7 with a clearance of several microns on the inner periphery of a, and a squeeze groove 3c with a clearance of a few microns or more is arranged near the top. .

4□2 permanent magnet, rotating sleeve 3, Kawaguchi ff13a
It is placed around the vicinity D, and forms magnetic flux for rotation by interacting with the stator dark, which will be described later.
There is also an iM suction force of the levitation reservoir of the rotating sleeve 3).

5. The stator yoke is firmly supported by the die 1.
The permanent magnet 4 including the f-ridge coil 5a and the permanent magnet 4 arranged around the rotary sleeve 3 performs magnetic combustion, and the rotary sleeve 3 is kept in a floating state by their mutual magnetic attraction force.

In the above-mentioned bearing of I'll structure, even if the entire force generated by the gas intake is almost constant, such as when the bearing stops or when rotating at low speed, the permanent magnet 4 and the stator yoke Since a magnetic attraction force is generated between the rotating sleeve 3 and the fixed shaft 2, the rotating sleeve 3 is in a floating state from the fixed shaft 2.

This is because the sum vector F of the magnetic attraction force vector f1 and f2 acting horizontally on the left and right between the stator yoke 5 on the left and right in FIG. 1 and the permanent magnet 4 facing the plate is '-
Since it is directed upward above W4, the rotating sleeve 3 floats up.

At the same time, during the 41st rotation, gas is removed from the opening 43a of the rotating sleeve 3, and the floating of the sleeve 3 is stabilized during the 1st rotation.

In addition, instead of the conventional levitation caused by opposing permanent magnets, and because the dependence of dust on dynamic pressure is reduced, it is possible to fix a groove (not shown) by simple processing. If the space between the rotary sleeve 3 and the stationary sleeve 3 is within a certain range or
This reduces the risk of eccentricity.

In addition, since the space previously occupied by the permanent magnet for levitation is now available, it is possible to place the detection element for detecting the rotational position of the rotating sleeve in 1, and the ejection element ``This means that the degree of freedom has increased.''

(Effects of the Invention) As described above, by utilizing the present invention, the floating of the rotating part can be maintained even when it is difficult to wait for a low speed rotation of +1 k, such as when stopping or when starting up. As a result, a motor support can be obtained that significantly reduces the risk of damage caused by collisions with books and presses during transportation of goods.

Furthermore, since a pair of permanent magnets, which were conventionally necessary to levitate the retrieval part, are no longer required, the number of parts required is naturally reduced, and a motor bearing with a reduced cost can be obtained.

Furthermore, the machining of the control shaft that helps the levitation is also simplified, making it possible to obtain a motor bearing that can reduce the number of manufacturing steps.

As an additional effect, the 34 functions of detecting rotational shape and rotational ground levitation can be achieved by using a single permanent magnet, which previously required one separate recovery.

4. Figure 1g1J is a cross section 1-21 of a motor bearing showing an embodiment of the present invention, and Figure 2 is a cross-section of a motor bearing according to an embodiment of the present invention. be.

1...Casing 2...Fixed shaft 3...Rotating sleeve 4...Permanent magnet 5...Stator yoke 6...Blowout holder 1. Serious Infringement 1985 15955] No. 2 Issued/Ill Name Motor Yuzuke 3 Amendment Person who obtains patents 〒】74 Tokyo Home Board Yui-ku Shimura 2-16-20 Telephone (9)
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Claims (1)

[Claims] 1. A motor having a structure in which a rotating part is levitated using dynamic pressure of gas or liquid, which includes a casing, one end of which is fixed to the casing, and the other end of which is left open. a fixed shaft having an inverted cup shape, a rotor having an aperture groove formed in its head and disposed so as to enclose and cover the fixed shaft from the other end; and a cup opening of the rotor. a stator yoke that has a permanent magnet supported around the hem of the rotor, and a stator yoke that has a winding coil, is supported on the inner periphery of the housing so as to face the permanent magnet, and applies rotational force and levitation force to the rotor. A motor bearing comprising: