CN1315246C - Heat sink and its motor structure - Google Patents

Abstract

The present invention provides a heat dissipation device and a motor structure thereof. The heat dissipation device comprises: an outer frame having a base disposed therein; at least two rotors disposed on the base respectively; and a stator composed of a plurality of silicon steel sheets or iron cores and a plurality of coils, wherein the silicon steel sheets or iron cores are embedded in the base to drive the at least two rotors. The present invention uses a single stator and a single control circuit to control the two rotors, which can make the motor structure of the heat dissipation device thinner and reduce its manufacturing cost.

Description

Heat sink and its motor structure

technical field

The invention relates to a cooling device and its motor structure, in particular to a fan motor with a single stator and a control circuit and double rotors.

Background technique

Because the axial flow fan has the characteristics of simple structure, low cost and large air volume, it is widely used as a cooling fan in computer-related and peripheral systems.

Generally, in order to avoid the interruption of system operation due to the failure of the axial flow fan, another set of spare fans is usually connected in series with the original cooling fan to prevent the system or its internal electronic components from being damaged due to overheating caused by the interruption of fan operation .

The so-called tandem fan is to connect two flow fans with independent actuating shafts in series. In the traditional fan shown in FIG. 1 , the motor 11 and the fan blade structure 12 are assembled in the fan frame 13 , and then the two assembled fans are combined by screws. However, this design is more complicated in assembly and requires more manufacturing time and cost, and it occupies a larger volume.

In the existing series fan products, after two independent fans are connected in series, the wind pressure may not have an additive effect, because the impedance of each other may be increased and the operating efficiency of each other may be reduced. Therefore, in order to reduce mutual interference, it is necessary to lengthen the distance between the two fans connected in series. However, this approach is not feasible when the installation space is limited.

Furthermore, the above-mentioned axial flow fans and general air blowers or blowers are all driven and controlled by a single motor and a single rotor, which greatly limits the performance of the fans, and their occupied volume and required The cost is also relatively much higher.

Therefore, how to design a tandem fan that occupies less space, is simple, fast and convenient to assemble, is low in cost, and can effectively reduce mutual interference between the two fans is the focus of the development of the present invention.

Therefore, in view of the shortcoming of known technology, the present invention finally creates this case "cooling fan and its motor structure" through careful testing and research and the spirit of perseverance. The following is a brief description of the case.

Contents of the invention

The main purpose of the present invention is to provide a heat dissipation device and its motor structure, which is a fan motor with a single stator and a control circuit but with double rotors.

According to an idea of the present invention, a cooling device is provided, which includes:

A base, having a hollow portion, the hollow portion protruding from opposite sides of the base through the base, and having a through hole;

At least two rotors are respectively arranged on the base;

a control element disposed on the base to control the rotation of the at least two rotors; and

A stator is composed of a plurality of silicon steel sheets or iron cores and a plurality of coils, wherein these silicon steel sheets or iron cores are embedded in the through holes of the base to drive the at least two rotors, and the coils are sleeved on the outside the hollow portion of the base.

The present invention also provides a cooling device, which includes:

An outer frame has a base, the base is arranged inside the outer frame, the base has a hollow portion, the hollow portion protrudes from the opposite sides of the base through the base, and has a consistent perforation;

At least two rotors are respectively arranged on the base;

A stator is composed of an excitation element and a coil, wherein the excitation element is embedded in the through hole of the base to drive the at least two rotors, and the coils are sleeved in the hollow part of the base outside; and

A control element is arranged on the base, and the control element includes a plurality of electronic elements for driving and controlling the rotation of the cooling device.

The present invention further provides a motor structure that can be applied in a fan, the fan has a base, the base has a hollow portion, the hollow portion passes through the base and protrudes on opposite sides of the base and has A through hole, the motor structure includes:

At least two rotors are respectively arranged on the base;

A stator is composed of an excitation element and a coil, wherein the excitation element is embedded in the through hole of the base to drive the at least two rotors, and the coils are sleeved outside the hollow portion of the base ;as well as

A control element is arranged on the base, and the control element includes a plurality of electronic elements for driving and controlling the at least two rotors.

In order to further illustrate the above-mentioned purpose, structural features and effects of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a longitudinal sectional view of a conventional axial flow fan.

FIG. 2A is a longitudinal sectional view of a preferred embodiment of the heat sink of the present invention.

FIG. 2B is a partial enlarged cross-sectional view of the heat dissipation device shown in FIG. 2A .

FIG. 3A is an exploded perspective view of the heat sink shown in FIG. 2A viewed from side A. FIG.

FIG. 3B is an exploded perspective view of the heat sink shown in FIG. 2A viewed from side B. FIG.

FIG. 4 is a comparison chart of air pressure and air volume characteristics between a known serial fan and the cooling device of the present case.

Detailed ways

Please refer to FIG. 2A , which shows a preferred embodiment of the heat dissipation device of the present invention. The cooling device is a serial fan, which includes an outer frame 21, a base 211, two rotors 22, 22' and a stator. The base 211 is arranged in the outer frame 21, and is fixed in the outer frame by connecting a connection portion 212 with the inner surface of the outer frame, and the connection portion can be composed of a plurality of ribs (ribs) or stationary vanes ( Stator blades). The base 211 has two sleeves 213, 213' extending to the opposite sides thereof respectively to house the bearing 29 therein and to support the rotating shaft 225 of the two rotors. The base 211 further has four hollow portions 214 inserted in the base 211 and respectively have through holes.

The stator is composed of a plurality of silicon steel sheets 24 and a plurality of coils 28, these silicon steel sheets 24 are respectively embedded in the through holes of the four hollow parts 214 on the base 211, and these coils 28 are sleeved on the base Out of the hollow portion 214 on one side of the seat 211. In addition, the above-mentioned silicon steel sheets can be replaced by iron cores or other components with similar functions. FIG. 2B shows an enlarged partial cross-sectional view of four sets of silicon steel sheets and four sets of coils in the cooling device shown in FIG. 2A . The four sets of silicon steel sheets and four sets of coils constitute the four magnetic poles of the motor.

The cooling device has a control element such as a printed circuit board (PCB) 23 disposed on the other side of the base 211 and includes a plurality of electronic components 27 thereon for driving and controlling the rotation of the cooling device.

The two rotors are respectively a driving rotor 22 and a passive rotor 22', and the two rotors are respectively composed of a hub 221, a plurality of blades 222, a magnetic ring 223 and an iron sheet 224. The iron piece 224 and the magnetic ring 223 are attached to the inner surface of the hub in sequence, and the blades are arranged around the hub 221 .

In addition, please refer to FIGS. 3A and 3B , which are perspective exploded views of the heat sink of the present application viewed from side A and side B in FIG. 2A respectively. It can be seen from the figure that the base 211 receives the two rotors 22, 22', so that they are arranged in series in the outer frame. The number of blades 222, 222' of the two rotors is different, but they can also be the same, and the The iron pieces 224, 224' and the magnetic rings 223, 223' are sequentially attached to the inner top surfaces of the hubs 221, 221' respectively. The circuit board 23 is only placed on one side of the base 211, on which a plurality of electronic components 27 are provided, and the four silicon steel sheet groups or core groups 24 are embedded in the through holes of the hollow part 214 and run through the Base 211. On the other side of the base, it can be seen that the four coil sets 28 are wound outside the hollow portion 214 . In addition, the base 211 is fixedly supported in the outer frame by connecting a plurality of vanes 212 (or ribs) to the inner surface of the outer frame 21 .

When the assembly is completed, the magnetic rings 223, 223' of the two rotors 22, 22' are respectively located at the opposite ends of the silicon steel sheets or cores 24 to induce a magnetic field. When the cooling device was in operation, the active rotor 22 induced its magnetic field change by a Hall element on the printed circuit board 23, and controlled the magnetic switching of the coil group 28 to make it run, and the driven rotor 22 The rotor 22 ′ will synchronously rotate in the same direction or reversely with the switching of the magnetic force of the coil group 28 . In addition, another Hall element is used to detect the rotational speed of the driven rotor 22'.

Finally, please refer to FIG. 4 , which is a comparison chart of the air pressure and air volume characteristics of the known serial fan and the cooling device of the present case. From this figure, it can be clearly seen that the wind pressure and air volume produced by the cooling device of this case are far greater than that of the known serial fan.

The above-mentioned embodiment is an example of a motor with four magnetic poles, but according to the idea of this application, it can also be applied to other motor structures with different numbers of magnetic poles.

Based on the above, the heat dissipation device disclosed by the present invention has a motor structure with a single stator, a single circuit board and double rotors, which can not only effectively reduce the volume and manufacturing cost of the heat dissipation device, but also connect multiple rotors in series In the frame, the air pressure and air volume of the cooling device can be greatly increased by setting the stator blades between them.

Although the present invention has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, and other modifications can be made without departing from the spirit of the present invention. Various equivalent changes and modifications, therefore, as long as the changes and modifications to the above embodiments are within the spirit of the present invention, they will all fall within the scope of the claims of the present invention.

Claims (13)

1. heat abstractor, it comprises:

One pedestal has a hollow bulb, and this hollow bulb runs through this pedestal and protrudes in outside the two opposite sides of this pedestal, and has a through hole;

At least two rotors are arranged at respectively on this pedestal;

One control element is arranged on this pedestal, to control the rotation of these at least two rotors; And

One stator is made up of a plurality of silicon steel sheets or unshakable in one's determination and a plurality of coil, and wherein these silicon steel sheets or iron core are embedded in this through hole of this pedestal, and in order to driving this at least two rotors, and these coils are socketed on outside this hollow bulb of this pedestal.

2. heat abstractor, it comprises:

One housing has a pedestal, and this pedestal is arranged within this housing, and this pedestal has a hollow bulb, and this hollow bulb runs through this pedestal and protrudes in outside the two opposite sides of this pedestal, and has a through hole;

At least two rotors are arranged at respectively on this pedestal;

One stator is made up of an excitatory element and a coil, and wherein this excitatory element is embedded in this through hole of this pedestal, and in order to driving this at least two rotors, and these coils are socketed on outside this hollow bulb of this pedestal; And

One control element is arranged on this pedestal, and this control element includes a plurality of electronic components, in order to drive and to control the rotation situation of this heat abstractor.

3. heat abstractor as claimed in claim 2 is characterized in that, this pedestal is connected with the inner surface of this housing by a junction and is fixed in this housing.

4. heat abstractor as claimed in claim 3 is characterized in that this connecting portion is made up of a plurality of ribs or stator blade.

5. heat abstractor as claimed in claim 1 or 2 is characterized in that this pedestal also has the two opposite sides that a plurality of sleeves are arranged at this pedestal respectively, with the rotating shaft of ccontaining these at least two rotors respectively with in order to support the bearing of this rotating shaft.

6. heat abstractor as claimed in claim 1, it is characterized in that, these at least two rotors are respectively a power rotor and passive rotor, this power rotor changes by the Hall element induced field on this control element, switch and make this power rotor running with the magnetic force of controlling this coil, and this passive rotor switches along with the magnetic force of this coil and synchronously in the same way or antiport.

7. heat abstractor as claimed in claim 2, it is characterized in that, these at least two rotors are respectively a power rotor and passive rotor, this power rotor changes by the Hall element induced field on this control element, switch and make this power rotor running with the magnetic force of controlling this coil, and this passive rotor switches along with the magnetic force of this coil and synchronously in the same way or antiport.

8. heat abstractor as claimed in claim 7 is characterized in that, this power rotor and this passive rotor have a wheel hub, a plurality of blade, a magnet ring and an iron plate respectively, and wherein this iron plate and this magnet ring are attached at the top surface in this wheel hub; This iron plate is between this wheel hub and this magnet ring, and this magnet ring of this power rotor and this passive rotor lays respectively at the two ends of this excitatory element, with induced field.

9. as claim 6 or 7 described heat abstractors, it is characterized in that, also comprise another Hall element, in order to detect the rotating speed of this passive rotor.

1O. heat abstractor as claimed in claim 1 or 2 is characterized in that, this control element is a printed circuit board (PCB).

11. heat abstractor as claimed in claim 1 or 2 is characterized in that, this heat abstractor can be an axial-flow type radiator fan, forced draft fan, air blast or centrifugal fan.

12. heat abstractor as claimed in claim 2 is characterized in that, this excitatory element is a silicon steel sheet or iron core.

13. a motor configuration can be applicable in the fan, this fan has a pedestal, and this pedestal has a hollow bulb, and this hollow bulb runs through this pedestal and protrudes in the two opposite sides of this pedestal and have a through hole, and this motor configuration comprises:

At least two rotors are arranged at respectively on this pedestal;

One stator is made up of an excitatory element and a coil, and wherein this excitatory element is embedded in this through hole of this pedestal, and driving this at least two rotors, and these coils are socketed on outside this hollow bulb of this pedestal; And

One control element is arranged on this pedestal, and this control element includes a plurality of electronic components, in order to drive and to control this at least two rotors.

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