JP3076974U - Improved structure of brushless DC motor - Google Patents

Abstract

(57) [Problem] To provide a brushless DC motor with a minimum thickness and volume by reducing the number of electronic elements on a circuit board in a situation in which the functions of the original brushless DC motor are retained. At the same time, the manufacture and assembly of the brushless DC motor seeks to provide an improved structure of the brushless DC motor which is further simplified. SOLUTION: It is constituted by a stator, a rotor and a driving element. The stator is formed so as to be connected to the stator seat, pole pieces and coils by a shaft tube, the rotor is pivotally connected to the shaft tube of the stator by a rotating shaft, and an annular magnet surrounding the stator is mounted on the inner peripheral wall of the rotor And
The drive element has a drive circuit and an inductive element, and is configured to be fixed to a stator seat of the stator.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an improved structure of a brushless DC motor in which the thickness of the brushless DC motor is further reduced by improving the structure of the brushless DC motor.

[0002]

[Prior art]

 Conventionally, this type is as follows.

[0003] Regarding the structure of the conventional brushless DC motor, a radiator driven by the conventional brushless DC motor shown in Figs. 1 and 2 has already been widely used for heat dissipation of heat-generating electronic elements and a central processing unit. In order to make conventional radiators usable even in narrow spaces, vendors have been focusing on development and research in the direction of reducing the volume of radiators.

A heat sink 9 of a conventional brushless DC motor shown in FIGS. 1 and 2 has a main body case 91 in which a shaft tube 92 is fitted, and an outer peripheral wall of the shaft tube 92 has a stator seat 93 and a circuit board 96. And a coil is wound around the stator seat 93. The stator seat 93 is provided with an upper magnetic pole piece 94 and a lower magnetic pole piece 95. The inner peripheral wall of the shaft tube 92 is pivotally connected to the shaft 98 of the rotor 97. The radiator 9 of the brushless DC motor is formed to have a constant thickness. Therefore, it is technically difficult for a manufacturer of a brushless DC motor radiator to reduce the thickness of the brushless DC motor radiator in a situation where necessary components are provided.

[0005] In the known brushless DC motor radiator 9, the circuit board 96 includes at least one Hall inductive element and one drive circuit, and the drive circuit includes at least two or more transistors and required electronics. The above-described Hall induction element is used to detect the magnetic polarity of the annular magnet of the rotor, and the electronic elements of the circuit board 96 are driven by the driving circuit to rotate the rotor. It cannot be omitted in the structure of the conventional brushless DC motor. However, by reducing the space occupied by circuit boards in a situation that does not affect the performance of the product, it can greatly contribute to the downsizing of the product.

[0006]

[Problems to be solved by the invention]

 The present invention has been devised in view of such problems, and aims at reducing the number of electronic element members on a circuit board in a situation in which the functions of the original brushless DC motor are retained. Accordingly, it is an object of the present invention to provide an improved structure of a brushless DC motor that allows the brushless DC motor to have a minimum thickness and volume.

A second object of the present invention is to provide a brushless DC motor by reducing the number of electronic elements on a circuit board in a situation where the original brushless DC motor has its functions. It is intended to provide an improved structure of a brushless DC motor.

[0008]

[Means for Solving the Problems]

 To achieve the above object, the improved structure of the brushless DC motor according to the present invention is as follows. That is, the improved structure of the brushless DC motor according to the present invention includes a stator, a rotor, and a driving element. The stator is formed to be connected to the stator seat, the pole piece and the coil by a shaft tube. The rotor is pivotally attached to the shaft pipe of the stator by a rotating shaft, and an annular magnet surrounding the stator is mounted on the inner peripheral wall of the rotor. The drive element has a drive circuit and an inductive element and is fixed to a stator seat of the stator.

Further, the improved structure of the brushless DC motor of the present invention can be configured as follows. 1. The stator has a concave notch for sinking and fixing the drive element. 2. The driving element is provided with at least four leads, two of which are formed so as to be connected to the coil of the stator, and one is connected so as to be connected to the power supply line. , And the other lead is configured to be grounded. 3. One of the two lead wires connected to the stator coil is connected to the detection wire. 4. It is composed of a stator, a rotor, a case body and a drive element. The stator is formed to be connected to the pole piece and the coil by a shaft tube. The rotor is pivotally attached to the shaft pipe of the stator by a rotating shaft, and an annular magnet surrounding the stator is mounted on the inner peripheral wall of the rotor. A shaft hole seat is provided on the main body case for coupling with the stator. The drive element has a drive circuit and an inductive element and is fixed to the main body case. 5. The case main body is provided with a concave notch for sinking and fixing the drive element. 6. The driving element is provided with at least four leads, two of which are formed so as to be connected to the coil of the stator, and one is connected so as to be connected to the power supply line. , And the other lead is configured to be grounded. 7. One of the two lead wires connected to the stator coil is connected to the detection wire. 8. The rotor is provided with blades. 9. It is composed of a base, a stator, a rotor and a drive element. A shaft seat is protruded from the base, and a bearing is fitted into the shaft seat. The stator can be fitted into the base shaft hole seat, and the stator is provided with an even number of magnetic pole arms, and the magnetic pole arms are wound with coils. The rotor is pivotally mounted on the inner peripheral wall of the base bearing by a rotating shaft, and an annular magnet surrounding the stator is mounted on the inner peripheral wall of the rotor. The drive element has a drive circuit and an inductive element and is fixed to a base. 10. The driving element is provided with at least four lead wires, two of which are formed so as to be connected to the coil of the stator, and one of which is connected to the power supply line. , And the other lead is configured to be grounded. 11. One of the two lead wires connected to the stator coil is connected to the detection wire. 12. The drive element is interposed at the base between the pole arms of the stator. 13. The rotor is provided with blades.

[0010]

[Embodiment of the invention]

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

[0011]

First Embodiment FIG. 3 is an exploded perspective view of a first embodiment of the present invention. The brushless DC motor of the present invention includes members such as a stator 1, a rotor 2, and a driving element 3.

A coil 12 is wound around the stator seat 11 of the stator 1, and the stator 1 is formed so as to be connected to the stator seat 11 and the upper and lower magnetic pole pieces 13 by a shaft tube 14.

The rotor 2 is pivotally mounted so as to be fixedly rotated in a shaft tube 14 of the stator 1 by a rotating shaft 21, and an annular magnet 22 is mounted on the rotor 2 itself. Since the annular magnet 22 has N and S magnetic poles and is mounted so as to surround the stator seat 11, the rotor 2 is guided to rotate corresponding to the stator 1.

The driving element 3 is formed by packaging an inductive element and a driving circuit. The driving element 3 can transmit a signal through a lead wire 31 and can be connected to the coil 12 of the stator 1. In a preferred embodiment, a special mark 32 is marked on the outer surface of the driving element 3 to indicate the best guiding point of the driving element 3. The driving element 3 can be fixed at an appropriate position by a lead wire 31. In the present embodiment, the driving element 3 is fixed to the stator seat 11 of the stator 1 and has a concave notch in the stator seat 22. By submerging 15, the whole or a part of the driving element 3 can be submerged in the recess 15, so that the coupled brushless DC motor is formed to have a minimum thickness.

FIGS. 4 and 5 are a bottom view and a sectional view, respectively, showing an assembled state in the first embodiment of the present invention. The rotor 2 is pivotally mounted in a stator single-shaft tube 14 by a rotating shaft 21. In addition, the driving element 3 is fixedly connected to the stator seat 11 of the stator 1. Since the stator seat 11 is made of an insulating material, the drive element 3 can perform accurate signal transmission, and the drive element 3 itself does not increase the thickness and volume of the entire motor.

[0016]

Second Embodiment FIG. 6 is an exploded perspective view of a second embodiment of the present invention. The brushless DC motor of the present invention includes a stator 1, a rotor 5, a case body 4, and a driving element 3. The main body case 4 is provided with a shaft hole seat 42 for coupling with the shaft tube 14 of the stator 1, and the shaft tube 14 is used for the rotation shaft 51 of the rotor 5 to rotate. An annular magnet 52 is attached to the rotor 5 itself, and a blade 53 is provided. In addition, since the driving element 3 can be fixed to the main body case 4 made of an insulating material, a radiator having a brushless DC motor is formed. Further, since the concave notch 41 is provided in the case body (4), the radiator is formed to have a minimum thickness when the radiator is assembled (as shown in FIG. 7).

[0017]

Third Embodiment FIG. 8 is an exploded perspective view of a third embodiment of the present invention. The brushless DC motor of the present invention includes a base 8, a stator 6, a rotor 7, and a driving element 3. The stator 6 is formed by winding a coil 62 in a radial direction around a plurality of magnetic pole arms 61 in which silicon steel pieces are superposed radially. The stator 6 is fitted into the shaft hole seat 81 of the base 8, and the bearing 82 of the shaft hole seat 81 is used to pivot the rotation shaft 71 of the rotor 7. An annular magnet 72 is mounted on the rotor 7 itself. Since the annular magnet 72 has N and S magnetic poles and is mounted so as to surround the periphery of the stator 6, the rotor 7 is guided to rotate corresponding to the stator 6.

The drive element 3 can be provided directly on the base 8, and the drive element 3 is preferably interposed between the magnetic pole arms 61 on the periphery of the stator 6. The change of the magnetic pole of the rotor 7 can be detected by the driving element 3 and the rotation of the rotor can be driven.

FIG. 9 is a design diagram of a drive circuit of an electronic element in the brushless DC motor of the present invention. As can be seen from FIG. 9, the driving element 3 of the present invention is provided with at least four leads, two of which are formed so as to be connected to the coils of the stator, One lead is connected to the power supply line and the other lead is configured to be grounded. Further, one of the two lead wires connected to the coil of the stator is configured to be connected to the detection wire 33. Since the detection line 33 can amplify a signal by at least one transistor 34, the rotation speed of the motor can be controlled or a failure of the motor can be detected and a warning can be given. .

[0020]

[Effect of the invention]

 According to the improved structure of the brushless DC motor described in claim 1 of the present invention, by combining the drive circuit and the Hall induction element with one drive element, the brushless DC motor as a whole is improved. Has the advantage that it is formed to have a relatively small thickness, and that the manufacture and assembly of the brushless DC motor is further simplified.

According to the improved structure of the brushless DC motor described in claims 2 and 6 of the present invention, the drive element can be sunk in the recessed portion of the stator seat, so that the brushless DC motor can be provided. The advantage is that the entire DC motor is formed to have a relatively small thickness.

[0022] According to the improved structure of the brushless DC motor described in claim 5 of the present invention, the brushless DC motor can be fixed to the case body. Has the advantage that it is formed to have a relatively small thickness and that the assembly of the brushless DC motor is further simplified.

According to the improved structure of the brushless DC motor described in claims 9 and 14 of the present invention, the rotor can be provided with a blade and formed on the radiator. This has the advantage that it can be used for heat radiation in a relatively small space.

According to the improved structure of the brushless DC motor described in claim 10 of the present invention, when the stator is formed by a radial winding method, the brushless DC motor can be compared. It has the advantage that it can be formed to a very small thickness.

According to the improved structure of the brushless DC motor described in claims 3, 7, and 11 of the present invention, the drive element can be easily directly fixed at the position where the drive element is to be fixed. Therefore, the connection of the control circuit of the brushless DC motor is further simplified by the driving element, and the brushless DC motor can be formed to have a relatively small thickness.

According to the improved structure of the brushless DC motor described in claims 4, 8, and 12 of the present invention, one detection line can be easily drawn out. This has the advantage that it can be used for detecting the rotation speed of the motor or for warning of a failure.

According to the improved structure of the brushless DC motor described in claim 13 of the present invention, the drive element is formed so as to be interposed in the base between the magnetic pole arms of the stator. This has the advantage that the brushless DC motor can be formed to have a relatively small thickness.

The present invention may be embodied in other ways without departing from its spirit and essential characteristics. Accordingly, the preferred embodiments described herein are illustrative and not limiting.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a member having a conventional structure.

FIG. 2 is a sectional view showing an assembled state of a member having a conventional structure.

FIG. 3 is an exploded perspective view of the first embodiment of the present invention.

FIG. 4 is a bottom view showing an assembled state according to the first embodiment of the present invention;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

FIG. 6 is an exploded perspective view according to a second embodiment of the present invention.

FIG. 7 is a sectional view illustrating an assembled state according to a second embodiment of the present invention;

FIG. 8 is an exploded perspective view according to a third embodiment of the present invention.

FIG. 9 is a design diagram of a drive circuit of the electronic device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Stator 11 Stator seat 12 Coil 13 Magnetic pole piece 14 Shaft tube 15 Depressed notch 2 Rotor 21 Rotary shaft 22 Ring magnet 3 Drive element 31 Lead wire 32 Mark 33 Detection wire 34 Transistor 4 Case 4 41 Depressed hole 42 Shaft hole seat 5 Rotor 51 Rotating shaft 52 Ring magnet 53 Blade 6 Stator 61 Magnetic pole arm 62 Coil 7 Rotor 71 Rotating shaft 72 Ring magnet 8 Base 81 Shaft hole 82 Bearing

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁷ Identification code FI H02K 9/06 H02K 9/06 Z

Claims (14)

[Utility model registration claims] 1. A stator (1) comprising a stator (1), a rotor (2) and a driving element (3). The stator (1) is constituted by a shaft seat (14), a stator seat (11), a pole piece (13) and a coil (12). ), And the rotor (2) is pivotally connected to the shaft pipe (14) of the stator (1) by a rotating shaft (21), and the inner peripheral wall of the rotor (2) is provided around the stator (1). An annular magnet (22) surrounding the stator is mounted, and the driving element (3) has a driving circuit and an inductive element and is fixed to a stator seat (11) of the stator (1). Improved structure. 2. The brushless DC motor according to claim 1, wherein the stator has a recessed portion for recessing and fixing the drive element. Construction. 3. The drive element (3) is provided with at least four leads (31), two of which (31) are connected to the coil (12) of the stator (1). 2. The device according to claim 1, wherein one of the leads is connected to a power supply line, and the other is connected to ground. Improved structure of brushless DC motor. 4. One of the two leads (31) connected to the coil (12) of the stator (1).
The improved structure of the brushless DC motor according to claim 3, wherein 1) is configured to be connected to the detection line (33). 5. A stator (1) comprising a stator (1), a rotor (5), a case body (4) and a driving element (3), and the stator (1) is constituted by a pole piece (13) and a coil (12) by means of a shaft tube (14). ), And the rotor (5) is pivotally connected to the shaft pipe (14) of the stator (1) by a rotating shaft (51), and the inner peripheral wall of the rotor (5) is provided around the stator (1). An annular magnet (52) surrounding the stator is mounted, and a shaft hole seat (42) for coupling with the stator (1) is projected from the main body case (4), and the driving element (3) is composed of a driving circuit and an inductive element. And an improved structure of the brushless DC motor, wherein the brushless DC motor is fixed to the main body case (4). 6. The brushless DC motor according to claim 5, wherein a recess (41) for recessing and fixing the drive element (3) is formed in the case body (4). Improved structure. 7. The driving element (3) is provided with at least four leads (31), two of which (31) are connected to the coil (12) of the stator (1). The lead wire (31) is connected to a power supply line, and the other lead wire (31) is configured to be grounded. Improved structure of brushless DC motor. 8. One of the two leads (31) connected to the coil (12) of the stator (1).
The improved structure of a brushless DC motor according to claim 7, wherein 1) is configured to be connected to the detection line (33). 9. The improved brushless DC motor according to claim 5, wherein the rotor (5) is provided with a blade (53). 10. A base (8), a stator (6), a rotor (7), and a driving element (3). The base (8) has a shaft hole seat (81) projecting therefrom. Seat (81)
A bearing (82) is fitted on the base (8), the stator (6) can be fitted into a shaft hole seat (81) of the base (8), and the stator (6) has an even number of magnetic pole arms (61). A coil (62) is wound around the magnetic pole arm (61), and the rotor (7) is pivotally mounted on an inner peripheral wall of a bearing (82) of the base (8) by a rotating shaft (71). An annular magnet (72) surrounding the stator (1) is mounted on the inner peripheral wall of 2), and the drive element (3) has a drive circuit and an inductive element and is fixed to the base (8). Improved structure of brushless DC motor characterized by 11. The drive element (3) is provided with at least four leads (31), two of which (31) are connected to the coil (12) of the stator (1). And a lead wire (31) connected to a power supply line and another lead wire (31) grounded.
Improved structure of the brushless DC motor described. 12. One of the two lead wires (31) connected to the coil (12) of the stator (1) is configured to be connected to the detection wire (33). The improved structure of the brushless DC motor according to claim 11, wherein: 13. The brushless DC motor according to claim 10, wherein the drive element is configured to be interposed between base poles between the magnetic pole arms of the stator. Improved structure of. 14. The improved structure of a brushless DC motor according to claim 10, wherein the rotor (7) is provided with a blade.