JP2006322325A - Motor fan and method of correcting balance of the motor fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make compatible workability and increase in correction accuracy when the balance of a motor fan is corrected and improve the self-cooling effect of a motor fan itself. <P>SOLUTION: This motor fan is so formed that a weight fitting/holding recessed part used as a first balance correction means is drilled at the insertion side opening end of a rotor and at least one row of a plurality of through holes concentric to the center of a rotating axis and equally disposed in a circular arc shape are formed in the other end bottom face thereof. The through holes are used for weight fitting/holding as a second balance correction means also served as a ventilator for ventilating the inside of the rotor hub to correct the balance of the two surfaces of the structure above. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a motor fan, in particular, a motor fan that has high and easy balance correction of an impeller and high self-cooling performance, and a balance correction method thereof.

JP 2000-352397 A Japanese Patent Laid-Open No. 2002-242887

Along with the development of electronic equipment, the miniaturization and high performance of the equipment itself and the quietness of environmental measures are also progressing. As a result, the need for a motor fan for cooling heat-generating parts has increased, and the performance as a motor fan has been maintained. There is no doubt that expectations for downsizing and calming will never stop.

In order to respond to improvement issues without interruption, measures such as rotating part balance correction to reduce operation noise related to quietness and improvement of internal cooling of motor fan itself related to miniaturization and high performance are accumulated day by day. There are many proposals.

The above-mentioned patent document 1 is an example of improvement of balance correction related to quieting, and patent document 2 is an example of improvement of the cooling effect with respect to self-heating of the motor fan itself, but details thereof are omitted in each publication.

The main problems to be solved by the motor fan according to the prior art as described above include improvement in self-cooling effect of the motor fan itself as well as improvement in workability and correction accuracy at the time of balance correction.

In the motor fan according to the present invention, a rotor hub including an impeller having a plurality of blades planted on an outer peripheral surface thereof is provided as a first balance correcting means in which a rotor insertion side open end of the motor is perforated. A plurality of weight fitting / holding through-holes as second balance correcting means that also serve as ventilation with the inside of the rotor hub, on the bottom surface of the other end.

The recessed portion drilled in the rotor hub open end is formed so as to be open on the inner peripheral side of the rotor hub,

The recesses drilled in the rotor hub open end are formed as a plurality of recesses equally distributed in the circumferential direction,

The through-hole formed in the bottom surface of the rotor hub is formed as a plurality of small holes equally arranged in an arc shape concentric with the rotation axis center, or

The through holes formed in the bottom surface of the rotor hub are all formed as a plurality of arcs concentric with the center of the rotation axis, and

A cup-shaped rotor yoke disposed on the inner surface of the rotor hub and holding a permanent magnet that forms the main body of the rotor has a gap communicating with the through hole between the outer surface and the inner surface of the rotor hub. Also have

A bottom hole of the rotor yoke is provided with a small hole facing the through hole of the rotor hub, or

The bottom of the rotor yoke is configured to include a small hole in a portion deviated from the through hole of the rotor hub,

The motor fan balance correction method includes a step of measuring unbalance, a step of selecting and extracting a weight for balance correction corresponding to the measurement result, and inserting and inserting the selected weight into a predetermined recess. And a step of fixing and holding the weight inserted and inserted into arbitrary portions formed on both surfaces of the rotor hub.

The configuration and means for balance correction according to the present invention enable high-precision correction on both the front and rear sides, enable further leveling of quietness and vibration suppression, and ensure ventilation with the inside of the rotor hub. The self-cooling is improved.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a half sectional view (a) of an example of a motor fan 0 according to the present invention technology and a partially enlarged view (b) showing a flow 9 of wind. A small hole for ventilation is provided in the rotor yoke 4. With a configuration that is not

FIG. 2 is a half sectional view (a) of another example of the motor fan 0 according to the present invention, and a partially enlarged view (b) showing the flow 9 of the wind. A configuration is shown in which a small hole 4-1 that deviates from the through hole 3-1 of the hub 3 is provided.

3 is a front view of an embodiment of the rotating part: impeller 1 according to the present invention shown in FIG. 1 or FIG. 2, FIG. 4 is a sectional view thereof, and FIG. 5 is a rear view thereof. 4, 7, and 2, 3 and 4.

Small holes 4-1 arranged in a circular arc are also formed at the bottom of the rotor yoke 4 containing the motor for driving the motor fan 0 and its control circuit.

The through-hole 3-1 has a gap 8 between the rotor yoke 3 and the rotor yoke 4 that holds the rotor permanent magnet 5 that is disposed in close proximity to the inner surface of the rotor hub 3 together with the rotor hub 3, and the rotor. The small hole 4-1 formed in the bottom of the yoke 4 communicates with and opens to the inside, and dissipates the self-heating of the motor and its control circuit arranged so that the rotor hub 3 covers almost the entire surface to the outside. It is easy to do.

In the present application, as described above, the through-hole 3-1 uses the gap 8 with the rotor yoke 4 as a ventilation path, and does not directly vent the interior space where the motor and its control circuit are arranged, but the rotor yoke 4. It cools indirectly by ventilation on the outer surface of the rotor, or functions as a ventilation hole that communicates with the small hole 4-1 of the rotor yoke 4 and vents to the inside where the motor and its control circuit are arranged. The part is used as means for fitting / holding the weight 7 on one end side of the double-sided balance correction.

The small hole 4-1 formed in the rotor yoke 4 is rotated to facilitate ventilation to the internal space where the motor and its control circuit are arranged if the motor fan 0 is in a normal mounting environment. The through hole of the rotor hub 3 is arranged so as to face the through hole 3-1 of the child hub 3, but in an environment with a lot of dust or the like, so that the outside air does not directly flow into the internal space. It is also effective to deviate the arrangement site between the 3-1 and the small hole 4-1 of the rotor yoke 4.

FIG. 4 is a cross-sectional view of the example of FIG. 3 described above, and a recessed portion 3-2 in an open shape is formed on the inner peripheral side of the opening end edge of the rotor hub. It is used as means for fitting / holding the weight 7 at the other end of the double-sided balance correction, and the configuration itself does not deny that it is a conventional general-purpose technique.

FIG. 5 is a rear view corresponding to FIG. 3 and shows the inner surface side of the rotor yoke 4.

FIGS. 6 and 7 are a front view and a rear view showing another example corresponding to FIGS. 3 and 5, and the first example has a configuration in which the through holes 3-1 are formed as a row of arcs. On the other hand, it is formed as two circular arc rows that are concentric. Needless to say, the arrangement and configuration of the through holes 3-1 are not limited to two arc rows.

The motor fan and its balance correction method according to the present invention can be widely used as means for realizing a motor fan that can meet the needs for miniaturization and high performance as well as highly accurate balance correction as a motor fan.

They are the half sectional view (a) of the example of the motor fan which becomes this invention, and the principal part enlarged view (b) which shows the flow of a wind. They are a half sectional view (a) of another example of a motor fan according to the present invention and an enlarged view (b) of a main part showing the flow of wind. It is a front view of the example of the rotation part corresponding to FIG. 1, FIG. It is sectional drawing of the example of FIG. FIG. 4 is a rear view of the example of FIG. 3. It is a front view of another example of the motor fan according to the present invention. It is a rear view of the example of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 0 Motor fan 1 Impeller 2 Blade 3 Rotor hub 3-1 Through-hole of rotor hub bottom face 3-2 Recessed part of rotor hub opening end 4 Rotor yoke 4-1 Small hole of rotor yoke bottom face
5 Permanent magnet 6 Axis 7 Balance adjustment weight 8 Clearance between rotor hub inner surface and rotor yoke outer surface 9 Wind flow

Claims (9)

  In a motor fan comprising a driving motor disposed inside a rotor hub and an impeller having a plurality of blades implanted on the outer peripheral surface of the rotor hub, the rotor hub is inserted into the rotor of the motor. A plurality of second balance correction means serving as a first balance correction means perforated at the side open end and a concave portion for weight fitting / holding as the first balance correction means, and also serving as a ventilation between the rotor hub and the inside of the rotor hub. A motor fan characterized by comprising a through-hole for weight fitting / holding.   2. The motor fan according to claim 1, wherein the recessed portion formed in the rotor hub open end is formed so as to be open toward an inner peripheral side of the rotor hub.   3. The motor fan according to claim 1, wherein the recessed portion formed in the rotor hub open end is formed as a plurality of recessed portions equally arranged in the circumferential direction. 4.   The through-hole formed in the bottom surface of the rotor hub is formed as a plurality of small holes equally arranged in a circular arc shape concentric with the rotation axis center. The motor fan as described in.   4. The motor fan according to claim 1, wherein each of the through holes formed in the bottom surface of the rotor hub is formed as a plurality of arcs concentric with the center of the rotation axis. .   A cup-shaped rotor yoke disposed on the inner surface of the rotor hub and holding a permanent magnet that forms the main body of the rotor has a gap communicating with the through hole between the outer surface and the inner surface of the rotor hub. The motor fan according to any one of claims 1 to 5, wherein the motor fan is formed.   The motor fan according to any one of claims 1 to 6, further comprising a small hole facing a through hole of the rotor hub at a bottom portion of the rotor yoke.   The motor fan according to claim 6, further comprising a small hole at a bottom portion of the rotor yoke that is deviated from a through hole of the rotor hub.   In the motor fan balance correction method, wherein a plurality of blades are implanted on the outer peripheral surface of the rotor hub, and the balance correction from both sides of the rotor hub is performed; A step of selecting / extracting a weight for balance correction corresponding to the measurement result, a step of inserting and inserting the selected weight into a predetermined recessed portion, and the weight inserted and inserted are formed on both sides of the rotor hub. The balance correcting method according to claim 1, further comprising a step of fixing and holding the concave portion at an arbitrary portion.

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