Motor device

Abstract

A motor device comprises a stator unit and a rotor unit. The stator unit comprises a magnetic conductive member, two insulating frames which are folded up and down to clamp the magnetic conductive member, and a plurality of coil windings which are wound on the insulating frames. And each insulating frame is also provided with a plurality of heat dissipation grooves. The rotor unit includes a housing cover covering the stator unit. A plurality of heat dissipation holes communicated with the heat dissipation grooves are formed in the shell cover in the axial direction. Each heat dissipation groove extends in the radial direction to pass through the interior of one coil winding and extends in the axial direction to form openings in the two sides of the coil winding, so that when airflow enters the shell cover from the heat dissipation holes due to rotation of the shell cover, the airflow enters the heat dissipation grooves to generate convection, and therefore the heat dissipation effect of the coil winding is improved. Therefore, the interiors of the coil windings are cooled, and the contact area between each coil winding and air flow is increased so as to improve the heat dissipation efficiency.

Description

Technical Field

[0001] This utility model relates to a motor device, and more particularly to a motor device with better heat dissipation efficiency. Background Technology

[0002] See Figure 1 and Figure 2 A typical motor assembly includes a stator structure 11 and a rotor structure 12 pivotally mounted on the stator structure 11. The stator structure 11 includes a mounting frame 111 and a plurality of windings 112 wound around the mounting frame 111 and spaced equidistantly from each other in the circumferential direction. The rotor structure 12 includes a pivot 121 passing through the mounting frame 111, a housing 122 connecting the pivot 121 and covering the stator structure 11, and a magnetic ring 123 surrounding the windings 112 and encircling the inner surface of the housing 122. The windings 112 are energized sequentially to generate magnetism, and under the interaction of the magnetic field with the magnetic ring 123, the rotor structure 12 rotates relative to the stator structure 11.

[0003] Because the winding assembly 112 generates a significant amount of heat during energization, typical motor devices usually have several vertically penetrating heat dissipation holes 124 on the outer casing 122. This allows airflow to be drawn into the casing 122 through the heat dissipation holes 124 by the suction effect of the rotating casing 122, thus cooling the winding assembly 112. However, each winding assembly 112 consists of multiple layers of coils, meaning that only a small section of the outermost coil facing upwards can contact the airflow and dissipate heat. A large amount of heat still accumulates in the inner coils, making this heat dissipation design inefficient due to its small heat dissipation area. Utility Model Content

[0004] The purpose of this invention is to provide a motor device with excellent heat dissipation efficiency.

[0005] This utility model relates to a motor device, comprising a stator unit and a rotor unit. The stator unit includes a magnetic conductor, two insulating frames that fit together to clamp the magnetic conductor, and multiple coil windings wound on the insulating frames. Each insulating frame has an inner housing, multiple support arms extending radially outward from the inner housing and arranged at equal angular intervals, and multiple stop plates extending axially from the ends of the support arms. The insulating frame also has multiple heat dissipation slots, each slot having a radially extending flow section recessed into one of the support arms, and two windings respectively connected to... The guide sections extend axially from opposite ends of the flow section, and are recessed in the inner housing and corresponding stop plates. Each coil winding is wound on two opposing support arms of the insulating frame. The rotor unit includes a pivoting mechanism that passes through the stator unit axially, an outer housing that can be rotated relative to the stator unit by the pivoting mechanism and covers the stator unit, and a magnetic ring disposed on the inner surface of the outer housing and circumferentially surrounding the stator unit. The outer housing has multiple heat dissipation holes axially connected to the guide sections.

[0006] The motor device of this utility model has each supporting arm of each insulating frame having a radially extending outer shell wall and two limiting blocks extending circumferentially in opposite directions from the ends of the outer shell wall. The outer shell wall has an end wall portion with its normal direction parallel to the axial direction and for corresponding stop plates to be provided, and two side wall portions extending axially from opposite sides of the end wall portion toward the other insulating frame. The connection between each side wall portion and the end wall portion forms a convex rounded corner, and the guide section of each heat dissipation groove is formed on one of the end wall portions.

[0007] In the motor device described in this utility model, the connection between the outer shell wall of each supporting arm and each limiting block forms an inner rounded corner.

[0008] The motor device of this utility model has an inner shell seat of each insulating frame having multiple interconnected rings arranged at equal angles, and each connected to the side wall of the supporting arm. One of the guide sections of each heat dissipation groove is opened on one of the side walls.

[0009] The motor device of this utility model has an inner shell seat of each insulating frame cooperating with the inner shell seat of another insulating frame to form an internal space. Each outer shell wall of each insulating frame is opposite to one outer shell wall of another insulating frame and cooperates to define a through slot that communicates with the internal space and extends radially. The magnetic conductive element has a plurality of electromagnetic steel sheets stacked axially. Each electromagnetic steel sheet has a ring core located in the internal space, a plurality of extension portions extending radially from the ring core portion and passing through the through slot, and a plurality of outer ends respectively disposed at the ends of the extension portions and located radially outside the corresponding through slot.

[0010] The motor device of this utility model includes an inner shaft tube passing through the ring core of the magnetic conductor and the inner shell seat of the insulating frame, two bearings disposed in the inner shaft tube and spaced apart from each other along the axial direction, and a pivot disposed on the bearings and connected to the outer shell cover.

[0011] In the motor device of this utility model, the heat dissipation holes of the outer casing are arranged at intervals along the axial direction, and the diameters of any two adjacent heat dissipation holes are different.

[0012] The beneficial effects of this invention are as follows: the flow section of each heat dissipation groove extends through the interior of one of the coil windings, while the axially extending guide sections are located radially on both sides of the coil windings and are not obstructed at the openings. Therefore, when the outer casing rotates, causing airflow to enter the outer casing through the heat dissipation holes, the airflow enters the flow section from one guide section of each heat dissipation groove and exits from the other guide section, forming convection. This allows the cooling airflow to penetrate deep into the coil windings to cool the inner coils and increases the contact area between the coil windings and the cooling airflow, thereby effectively improving heat dissipation efficiency. Attached Figure Description

[0013] Figure 1 It is a 3D exploded diagram illustrating a typical motor device;

[0014] Figure 2 This is a side sectional view, illustrating... Figure 1 The side view cross-sectional pattern;

[0015] Figure 3 This is an exploded perspective view illustrating an embodiment of the motor device of this utility model;

[0016] Figure 4 This is a side sectional view, illustrating... Figure 3 The side view cross-sectional pattern;

[0017] Figure 5 This is a perspective view illustrating the two insulating frames and the two coil windings therein in the described embodiment;

[0018] Figure 6 This is a top-view sectional view, illustrating... Figure 3 Top-view cross-sectional view;

[0019] Figure 7 This is a perspective view illustrating the stator unit of the described embodiment. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] See Figure 3 , Figure 4 ,and Figure 5 An embodiment of the motor device of this utility model includes a stator unit 2 and a rotor unit 3 disposed on the stator unit 2. The stator unit 2 includes two insulating frames 4 that are axially opposed to each other, a magnetic conductor 5 sandwiched between the insulating frames 4 axially, and a plurality of coil windings 6 wound on the insulating frames 4. Each insulating frame 4 has an inner housing 41, a plurality of bearing arms 42 that extend radially outward from the inner housing 41 and are arranged in a ring at equal angles to each other, and a plurality of stop plates 43 that protrude axially from the ends of the bearing arms 42. The insulating frame 4 also has a plurality of heat dissipation grooves 44, each heat dissipation groove 44 having a flow section 441 that extends radially and is recessed in one of the bearing arms 42, and two guide sections 442 that are respectively connected to opposite ends of the flow section 441 and extend axially, the guide sections 442 being recessed in the inner housing 41 and the corresponding stop plates 43. The inner shell base 41 has multiple interconnected rings arranged at equal angles, and each is connected to the side walls 411 of the supporting arm 42. One of the guide sections 442 of each heat dissipation groove 44 is formed on one of the side walls 411. The inner shell base 41 of each insulating frame 4 cooperates with the inner shell base 41 of another insulating frame 4 to form an internal space 45.

[0022] See Figure 4 , Figure 5 ,and Figure 6Each supporting arm 42 has a radially extending outer shell wall 421 and two circumferentially oppositely extending limiting blocks 422 from the ends of the outer shell wall 421. The maximum circumferential width of the limiting blocks 422 is greater than the maximum circumferential width of the outer shell wall 421. The connection between the outer shell wall 421 and each limiting block 422 forms an inner rounded corner A, a design that maximizes space utilization, thereby obtaining more winding space. Each outer shell wall 421 of each insulating frame 4 mates with one of the outer shell walls 421 of another insulating frame 4, and they cooperate to define a radially extending through slot 423 communicating with the internal space 45. The outer shell wall 421 has an end wall portion 424 with its normal direction parallel to the axial direction for a corresponding stop plate 43, and two side wall portions 425 extending axially toward the other insulating frame 4 from opposite sides of the end wall portion 424 in the circumferential direction. Each sidewall portion 425 forms a convex fillet B at the connection with the endwall portion 424. The guide section 442 of each heat dissipation groove 44 is formed on one of the endwall portions 424.

[0023] See Figure 4 , Figure 6 ,and Figure 7 The magnetic conductive element 5 has a plurality of electromagnetic steel sheets 51 stacked axially and located axially between the insulating frames 4. Each electromagnetic steel sheet 51 has a ring core 511 located in the internal space 45, a plurality of extensions 512 extending radially from the ring core 511 and passing through the through slots 423, and a plurality of outer ends 513 respectively disposed at the ends of the extensions 512 and located radially outside the corresponding through slots 423. Each outer end 513 is located radially outside one of the supporting arms 42, and the circumferential width of the outer end 513 is greater than the circumferential width of the limiting block 422. In this way, the outer end 513 cannot move radially inward. Under the restriction of the multiple supporting arms 42 in different directions, the electromagnetic steel sheet 51 cannot move radially or circumferentially. At the same time, the inner shell seat 41 also restricts the overlapping electromagnetic steel sheets 51 from moving axially, thereby achieving the effect of positioning the magnetic conductive element 5. Each coil winding 6 is wound around two opposing support arms 42 of the insulating frame 4. Specifically, the coil winding 6 passes through the end wall 424 and side wall 425 of the outer shell wall 421 of each support arm 42, and the convex fillet B at the connection between each side wall 425 and the end wall 424 (see...) Figure 5 It is located precisely at the bend of the coil winding 6 when it turns. This design prevents the coil winding 6 from bending excessively when it bends and avoids damage to the coil winding 6.

[0024] See Figure 3 , Figure 4 ,and Figure 6 The rotor unit 3 includes a pivoting mechanism 7 that passes through the stator unit 2 axially, an outer casing 8 that can be rotated relative to the stator unit 2 by the pivoting mechanism 7 and covers the stator unit 2, and a magnetic ring 9 disposed on the inner surface of the outer casing 8 and circumferentially surrounding the stator unit 2. The pivoting mechanism 7 includes an inner shaft tube 71 that passes through the ring core 511 and the inner housing 41, two bearings 72 disposed in the inner shaft tube 71 and spaced apart from each other axially, and a pivot 73 disposed on the bearings 72 and connected to the outer casing 8. The outer casing 8 has a plurality of heat dissipation holes 81 axially arranged to communicate with the guide section 442, and the heat dissipation holes 81 are spaced apart axially, with any two adjacent heat dissipation holes 81 having different diameters.

[0025] In this invention, the flow section 441 of each heat dissipation groove 44 extends through the interior of one of the coil windings 6, while the axially extending guide sections 442 are located radially on both sides of the coil winding 6, and each guide section 442 is not obstructed at its opening. Therefore, when the outer casing 8 rotates, causing airflow to enter the outer casing 8 through the heat dissipation holes 81, the airflow will enter the flow section 441 through one of the guide sections 442 of each heat dissipation groove 44, and then exit through the other guide section 442, forming convection. This convection-type heat dissipation can forcibly guide the airflow to produce a better heat dissipation effect on the coil winding 6. At the same time, the design of the airflow flowing through the flow section 441 allows the cooling airflow to penetrate deep into the coil winding 6 to cool the inner coil, and gives the coil winding 6 more contact area with the cooling airflow, thereby effectively improving the heat dissipation efficiency.

[0026] In summary, the present invention, through the arrangement of the heat dissipation groove 44, can significantly increase the contact area between the coil winding 6 and the airflow. At the same time, through the convective airflow guidance, the cooling airflow penetrates deep into the inner layer of the coil winding 6, thereby carrying away the internal heat energy and effectively improving the heat dissipation effect and efficiency. In addition, the present invention also avoids excessive angle or damage when each coil winding 6 is bent through the convex rounded corner B design, and increases the winding space through the inner rounded corner A design. Therefore, the present invention can indeed achieve its purpose.

Claims

1. A motor device comprising a stator unit and a rotor unit; characterized in that: The stator unit includes a magnetic conductor, two insulating frames that fit together to clamp the magnetic conductor, and multiple coil windings wound on the insulating frames. Each insulating frame has an inner shell, multiple support arms extending radially outward from the inner shell and arranged in annular intervals at equal angles, and multiple stop plates extending axially from the ends of the support arms. The insulating frame also has multiple heat dissipation slots, each heat dissipation slot having a flow section extending radially and recessed into one of the support arms, and two opposite ends connected to the flow section. The guide section extends axially and is recessed in the inner shell and the corresponding stop plate. Each coil winding is wound on two opposing support arms of the insulating frame. The rotor unit includes a pivoting mechanism that passes through the stator unit axially, an outer shell that can be driven by the pivoting mechanism to rotate relative to the stator unit and cover the stator unit, and a magnetic ring disposed on the inner surface of the outer shell and surrounding the stator unit circumferentially. The outer shell has multiple heat dissipation holes that communicate with the guide section axially.

2. The motor device according to claim 1, characterized in that: Each supporting arm of each insulating frame has a radially extending outer shell wall and two limiting blocks extending circumferentially in opposite directions from the ends of the outer shell wall. The outer shell wall has an end wall portion with its normal direction parallel to the axial direction and for corresponding stop plates to be provided, and two side wall portions extending axially toward another insulating frame from opposite sides of the end wall portions in the circumferential direction. The connection between each side wall portion and the end wall portion forms a convex rounded corner. The guide section of each heat dissipation groove is formed on one of the end wall portions.

3. The motor device according to claim 2, characterized in that: The connection between the outer shell of each supporting arm and each limiting block forms an inner rounded corner.

4. The motor device according to claim 2, characterized in that: Each insulating frame has an inner shell base with multiple interconnected rings arranged at equal angles, and each ring is connected to the side wall of the supporting arm. One of the guide sections of each heat dissipation groove is formed on one of the side wall.

5. The motor device according to claim 4, characterized in that: Each insulating frame's inner shell seat cooperates with the inner shell seat of another insulating frame to surround an internal space. Each outer shell wall of each insulating frame mates with one outer shell wall of another insulating frame, and they cooperate to define a through slot that connects to the internal space and extends radially. The magnetic conductor has a plurality of electromagnetic steel sheets stacked axially. Each electromagnetic steel sheet has a ring core located in the internal space, a plurality of extensions extending radially from the ring core and passing through the through slot, and a plurality of outer ends respectively disposed at the ends of the extensions and located radially outside the corresponding through slot.

6. The motor device according to claim 5, characterized in that: The pivoting mechanism of the rotor unit includes an inner shaft tube passing through the ring core of the magnetic conductor and the inner shell seat of the insulating frame, two bearings disposed in the inner shaft tube and spaced apart from each other along the axial direction, and a pivot disposed on the bearings and connected to the outer shell cover.

7. The motor device according to claim 1, characterized in that: The heat dissipation holes of the outer casing are arranged at intervals along the axial direction, and the diameters of any two adjacent heat dissipation holes are different.

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