CN216436932U - Direct current brushless motor - Google Patents
Direct current brushless motor Download PDFInfo
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- CN216436932U CN216436932U CN202122237825.3U CN202122237825U CN216436932U CN 216436932 U CN216436932 U CN 216436932U CN 202122237825 U CN202122237825 U CN 202122237825U CN 216436932 U CN216436932 U CN 216436932U
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Abstract
The utility model discloses a brushless DC motor belongs to the motor field, the problem that the radiating effect is difficult to promote among the prior art is solved, the technical scheme who solves this problem mainly includes casing, end cover, stator module, rotor subassembly and circuit board, end cover fixed connection is in the rear end of casing, stator module is fixed in shells inner wall and overlaps in the rotor subassembly periphery, the circuit board is fixed in the casing, the rotor subassembly includes pivot and rotor core, the pivot is passed through the bearing and is located casing and end cover, on the circuit boardA through hole for the rotating shaft to pass through is arranged, the center of the through hole is eccentric relative to the center of the rotating shaft, the eccentricity is E, and the diameter of the through hole is D1The outer diameter of the circuit board is D2，D1＝0.3D2～0.5D2，E＝0.05D2～0.15D2. The utility model discloses mainly used promotes the radiating effect.
Description
Technical Field
The utility model relates to the field of electric machines, especially a direct current brushless motor.
Background
An existing brushless dc motor, as shown in fig. 1, generally includes a housing 01, an end cover 02, a stator assembly 03, a rotor assembly and a circuit board 04, the end cover 02 is fixedly connected to a rear end of the housing 01, the stator assembly 03 is fixed to an inner wall of the housing 01 and is sleeved on a periphery of the rotor assembly, the circuit board 04 is fixed in the housing 01, the rotor assembly includes a rotating shaft 05 and a rotor core 051, the rotating shaft 05 is positioned at the housing 01 and the end cover 02 through a bearing 06, a through hole 041 through which the rotating shaft 05 passes is provided on the circuit board 04, a center of the through hole 041 is basically designed to coincide with a center of the rotating shaft 05 at present, a heat transfer distance from the rotor core 051 to the end cover 02 through the through hole 041 is equal everywhere in a circumferential direction of the through hole 041, therefore, heat of the rotor core 051 is uniformly transferred to the end cover 02, as shown by an arrow in fig. 1, and a heat dissipation effect is difficult to be improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to reach the purpose that just provides a brushless DC motor, promotes the radiating effect.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a brushless DC motor, which comprises a housin, the end cover, stator module, rotor subassembly and circuit board, end cover fixed connection is in the rear end of casing, stator module is fixed in shells inner wall and overlaps in the rotor subassembly periphery, the circuit board is fixed in the casing, the rotor subassembly includes pivot and rotor core, the pivot is passed through the bearing and is positioned casing and end cover, be equipped with the perforating hole that supplies the pivot to pass on the circuit board, the central off-centre and the eccentricity of the relative pivot in center of perforating hole are E, the diameter of perforating hole is D1The outer diameter of the circuit board is D2，D1＝0.3D2～0.5D2，E＝0.05D2～0.15D2。
Preferably, the front surface of the circuit board is provided with an intelligent power module, and the position of the intelligent power module is opposite to the eccentric direction of the through hole.
As a further preferred scheme, the circuit board is a single-sided board, the front side of the circuit board faces the end cover, the back side of the circuit board faces the rotor core of the rotor assembly, and the front side of the circuit board is provided with a hall element for detecting the rotating speed of the rotor assembly.
As a further preferable scheme, the distance between the back surface of the circuit board and the end surface of the rotor core is L, and L is more than or equal to 0.5 mm.
As a further preferable scheme, the intelligent power module is attached to the end cover to dissipate heat.
As a further preferable scheme, the intelligent power module is attached to the end cover through heat conducting mud.
Preferably, E is 5mm, D1＝34mm，D2＝81mm。
Preferably, the circuit board is provided with an I/O pad for soldering a lead, and the center of the through hole is eccentric to the position of the I/O pad.
As a further preferable scheme, two GND connecting holes are arranged on the circuit board, and the GND connecting holes and the I/O welding points are distributed in a straight line.
After the technical scheme is adopted, the utility model has the advantages of as follows: with perforating hole eccentric settings after for rotor core sees through the perforating hole and has had the length to the heat transfer distance of end cover and have the weak point, and especially the perforating hole compares the eccentric part of prior art, can let rotor core shorten to the heat transfer distance of end cover, and direct current brushless motor is in the course of the work, and rotor core is rotatory fast, makes whole rotor core's terminal surface can utilize the eccentric part of perforating hole to obtain and the end cover between shorter heat transfer distance come the heat transfer, with this improvement radiating effect. After the through hole is eccentrically arranged, in order to ensure that the clearance between the hole wall of the through hole and the rotating shaft meets the design requirement, the diameter D of the through hole1The diameter of the through hole is naturally larger than that of the through hole in the prior art, so that the rotating shaft can be conveniently installed by penetrating through the through hole, and the heat transfer area between the end face of the rotor core and the end cover by penetrating through the through hole can be increased; due to D1After enlargement, the diameter D of the circuit board2No change, thereby ensuring the structural strength of the circuit board, avoiding the obvious reduction of the structural strength of the circuit board caused by the overlarge through hole, and controlling D1＝0.3D2～0.5D2(ii) a The eccentric arrangement of the through hole is also required to be certain, and penetration cannot occurThe strength of the part of the circuit board with reduced width is too low after the through hole is eccentric, so that the requirement that E is 0.05D2～0.15D2And after the through hole is eccentrically arranged, an area with a larger width can be generated on the circuit board, so that the printed circuit and the mounted components can be more easily concentrated, the space utilization rate of the circuit board is improved, the design and the processing of the circuit board are facilitated, and the production cost can be reduced.
Drawings
The present invention will be further explained with reference to the accompanying drawings:
fig. 1 is a sectional view of a prior art dc brushless motor;
fig. 2 is a schematic structural diagram of a dc brushless motor according to the present invention;
fig. 3 is a schematic diagram of the front side of the circuit board according to the present invention;
fig. 4 is a schematic diagram of the back side of the circuit board according to the present invention.
Detailed Description
The utility model provides a brushless DC motor, see figure 2, including casing 1, end cover 2, stator module 3, rotor subassembly and circuit board 4, end cover 2 fixed connection is in casing 1's rear end, stator module 3 is fixed in the casing 1 inner wall and overlaps in the rotor subassembly periphery, circuit board 4 is fixed in casing 1, the rotor subassembly includes pivot 5 and rotor core 51, pivot 5 is located casing 1 and end cover 2 through bearing 6, pivot 5 stretches out from casing 1's front end, be equipped with the perforating hole 41 that supplies pivot 5 to pass on the circuit board 4, the central eccentricity of the relative pivot 5 in center of perforating hole 41.
The utility model discloses behind 41 eccentric settings of perforating hole, make rotor core 51 see through perforating hole 41 to end cover 2's heat transfer distance have long there is the short, especially perforating hole 41 compares the eccentric part of prior art, can let rotor core 51 shorten to end cover 2's heat transfer distance, and direct current brushless motor is in the course of the work, rotor core 51 is rotatory fast, make whole rotor core 51's terminal surface can utilize the eccentric part of perforating hole 41 to obtain and end cover 2 between shorter heat transfer distance come the heat transfer, as shown in fig. 2 arrow, with this radiating effect that improves. For convenience of explanation, may be markedThe eccentricity of the center of the through hole 41 with respect to the center of the rotating shaft 5 is E, and the diameter of the through hole 41 is D1The outer diameter of the circuit board 4 (substantially circular) is D2Since the circuit board 4 is substantially concentrically mounted with the rotation shaft, the distance from the center of the circuit board 4 to the center of the through hole 41 is shown as E in fig. 3, and since the through hole 41 is eccentrically arranged, the diameter D of the through hole 41 is set to satisfy the design requirement for the gap between the wall of the through hole 41 and the rotation shaft 51The diameter of the through hole 41 is naturally larger than that of the through hole 41 in the prior art, so that the installation of the rotating shaft 5 through the through hole 41 is facilitated, and the heat transfer area between the end face of the rotor core 51 penetrating through the through hole 41 and the end cover 2 is increased; due to D1After enlargement, the diameter D of the circuit board 42No change occurs, so that D can be controlled to ensure the structural strength of the circuit board 4 and avoid the structural strength of the circuit board 4 from being obviously reduced due to the overlarge through hole 411＝0.3D2～0.5D2(ii) a The eccentric arrangement of the through hole 41 is also required to be constant, and the strength of the portion of the wiring board where the width is reduced due to the eccentricity of the through hole 41 cannot be too low, so that E is required to be 0.05D2～0.15D2And after the through hole 41 is eccentrically arranged, an area with the increased width can be generated on the circuit board 4, so that printed circuits and mounted components can be more easily concentrated, the space utilization rate of the circuit board 4 is improved, the design and the processing of the circuit board 4 are facilitated, and the production cost can be reduced. As a practical application of one embodiment, E ═ 5mm, D may be selected1＝34mm，D2The motor can be applied to motors with the rotating shaft 5 of models such as 8mm, 12mm and 15mm in diameter and has good universality.
In order to reduce components and parts quantity on circuit board 4, the utility model discloses select to be equipped with intelligent power module 42 in the front of circuit board 4, intelligent power module 42 is used for replacing current control IC + power module's structure, correspondingly also can reduce the components and parts quantity that uses with control IC + power module's structure cooperation, can become 43 from 76 at most, the quantity reduces 43%, greatly reduced manufacturing cost, the product quality also more easily obtains the guarantee, and just because perforating hole 41 off-centre sets back, let intelligent power module 42 have the space that sets up, because the region that has a width grow on circuit board 4, install intelligent power module 42 at this region, the position that intelligent power module 42 is located is opposite with perforating hole 41's off-centre direction promptly.
Due to the adoption of the intelligent power module 42, the number of components on the circuit board 4 is greatly reduced, so that the circuit board 4 can be selected to be a single-panel, namely, no component is arranged on the back side of the circuit board 4, as shown in fig. 4, the front side of the circuit board 4 faces the end cover 2, the back side of the circuit board 4 faces the rotor core 51, and the front side of the circuit board 4 is provided with the hall element 43 for detecting the rotating speed of the rotor assembly. The circuit board 4 adopts the single-sided board, and at the in-process of processing circuit board 4, only need carry out single face printed circuit and installation components and parts, manufacturing cost descends obviously, and production efficiency also obtains promoting, when quality control and maintenance, only need inspect the front of circuit board 4 in addition, also more aspect. Since there is no component on the back of the circuit board 4, it can be mounted and fixed closer to the rotor core 51, and therefore the hall element 43 is disposed on the front of the circuit board 4, so that the rotation speed can be detected well and a relatively accurate detection result can be obtained. In a specific product, the distance between the back surface of the circuit board 4 and the end surface of the rotor core 51 is L, and L can be designed to be 0.5mm at the minimum, namely L is greater than or equal to 0.5mm, and L can be changed under the influence of the power of the hall element 43, wherein if the hall element 43 with smaller power is adopted, L is naturally smaller as better, and if the hall element 43 with larger power is adopted, L can be properly increased. And because circuit board 4's the back does not have components and parts, circuit board 4 can be close to rotor core 51 installation more fixed, make in the shell of same length, go out certain size's length space more, can be used for increasing rotor core 51's length, can improve DC brushless motor's rated power, conversely, also because circuit board 4's the back does not have components and parts, circuit board 4 can be close to rotor core 51 installation more fixed, for obtaining same rated power, DC brushless motor's length can shorten certain size.
In order to improve the heat dissipation effect of the smart power module 42, the smart power module 42 may be attached to the end cap 2 for heat dissipation. In this embodiment, the heat dissipation effect can be further improved by attaching the intelligent power module 42 to the end cap 2 through the heat conducting mud.
Further, since the I/O pad 44 for wire bonding is provided on the circuit board 4, components are not generally mounted in the vicinity of the I/O pad 44, and therefore, the center of the through hole 41 can be made eccentric to the position of the I/O pad 44. In the prior art, there is typically only one GND socket 45 on the circuit board 4. In order to facilitate the EMC countermeasure of the external Y capacitor of the user, two GND connecting holes 45 may be provided on the circuit board 4, and the GND connecting holes 45 and the I/O pads 44 are arranged in a line for convenient observation and soldering.
In addition to the above preferred embodiments, the present invention has other embodiments, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, which should fall within the scope defined by the appended claims.
Claims (9)
1. The utility model provides a brushless DC motor, includes casing, end cover, stator module, rotor subassembly and circuit board, end cover fixed connection is in the rear end of casing, and stator module is fixed in shells inner wall and overlaps in the rotor subassembly periphery, and the circuit board is fixed in the casing, and the rotor subassembly includes pivot and rotor core, and the pivot is passed through the bearing and is positioned casing and end cover, is equipped with the perforating hole that supplies the pivot to pass on the circuit board, its characterized in that, the central off-centre and the eccentricity of the relative pivot in center of perforating hole are E, and the diameter of perforating hole is D1The outer diameter of the circuit board is D2，D1＝0.3D2～0.5D2，E＝0.05D2～0.15D2。
2. The dc brushless motor of claim 1, wherein the front surface of the circuit board is provided with an intelligent power module at a position opposite to an eccentric direction of the through hole.
3. The brushless dc motor of claim 2, wherein the circuit board is a single-sided board, a front surface of the circuit board faces the end cap, a back surface of the circuit board faces the rotor core of the rotor assembly, and the front surface of the circuit board is provided with a hall element for detecting a rotation speed of the rotor assembly.
4. The brushless DC motor according to claim 3, wherein the distance between the back surface of the circuit board and the end surface of the rotor core is L, L is not less than 0.5 mm.
5. The brushless dc motor of claim 2, wherein the smart power module is attached to an end cap to dissipate heat.
6. The brushless dc motor of claim 5, wherein the smart power module is attached to the end cap by a thermal paste.
7. The dc brushless electric machine of claim 1, wherein E-5 mm, D1＝34mm，D2＝81mm。
8. The brushless dc motor of claim 1, wherein the circuit board has I/O pads for bonding leads, and the center of the through hole is eccentric to a position of the I/O pad.
9. The brushless dc motor of claim 8, wherein the circuit board has two GND connecting holes, and the GND connecting holes are arranged in a row with the I/O pads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122237825.3U CN216436932U (en) | 2021-09-15 | 2021-09-15 | Direct current brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122237825.3U CN216436932U (en) | 2021-09-15 | 2021-09-15 | Direct current brushless motor |
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| Publication Number | Publication Date |
|---|---|
| CN216436932U true CN216436932U (en) | 2022-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122237825.3U Active CN216436932U (en) | 2021-09-15 | 2021-09-15 | Direct current brushless motor |
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| CN (1) | CN216436932U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023040063A1 (en) * | 2021-09-15 | 2023-03-23 | 杭州松下马达有限公司 | Brushless direct-current electric motor |
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2021
- 2021-09-15 CN CN202122237825.3U patent/CN216436932U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023040063A1 (en) * | 2021-09-15 | 2023-03-23 | 杭州松下马达有限公司 | Brushless direct-current electric motor |
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