TW201944706A - Motor and electromagnetic interference protection device for the motor with a circuit board having a conductive connection part and a ground part electrically connected to the conductive connection part - Google Patents

Abstract

The present invention relates to a motor and an electromagnetic interference protection device for the motor. The motor includes a base, a shaft tube, a stator, a rotor, and a circuit board. The shaft tube includes a first conductive part and a second conductive part. The stator has a silicon steel sheet set. The silicon steel sheet set is disposed on the shaft tube and electrically connected to the first conductive part. The rotor is rotatably disposed on the shaft tube. The circuit board has a conductive connection part and a ground part. The conductive connection part is electrically connected to the second conductive part, The ground part is electrically connected to the conductive connection part. Accordingly, the motor and the electromagnetic interference protection device of the present invention can prevent the related electronic components or devices adjacent to the motor from being subjected to electromagnetic interference, thereby improving the protection effect of electromagnetic interference.

Description

Motor and electromagnetic interference protection device for motor

The invention relates to a motor and an electromagnetic interference protection device for the motor.

The conventional motor is mainly composed of a stator and a rotor. There is an air gap between the stator and the rotor. After the stator is energized, a magnetic field can be generated to drive the rotor to rotate. However, the stator of the conventional motor is prone to electromagnetic interference during operation. The electromagnetic interference protection of the conventional motor is not good. As a result, the electronic components or devices adjacent to the motor are likely to suffer electromagnetic interference during actual use. As a result, electronic components or devices in the vicinity of the motor are not operating properly.

The present invention provides a motor. In one embodiment, the motor includes a base, a shaft tube, a certain sub-group, a rotor group and a circuit board. The shaft tube is disposed on the base. The shaft tube includes a first conductive portion and a second conductive portion, and the first conductive portion and the second conductive portion are electrically connected. The stator has a silicon steel sheet group and a coil group. The silicon steel sheet group is disposed on the shaft tube and is electrically connected to the first conductive part. The coil group is wound and combined with the silicon steel sheet group. The rotor is rotatably disposed on the shaft tube. The circuit board is electrically connected to the stator. The circuit board has a conductive portion and a ground portion. The conductive portion is electrically connected to the second conductive portion. The ground portion is electrically connected to the conductive portion.

The invention provides an electromagnetic interference protection device for a motor. In one embodiment, the electromagnetic interference protection device includes: a shaft tube, a silicon steel sheet group, and a circuit board. The shaft tube has a first conductive portion and a second conductive portion, and the first conductive portion and the second conductive portion are electrically connected. The silicon steel sheet group is disposed on the shaft tube and is electrically connected to the first conductive portion. The circuit board is disposed outside the shaft tube. The circuit board has a conductive portion and a ground portion. The conductive portion is electrically connected to the second conductive portion, and the ground portion is electrically connected to the conductive portion.

Therefore, the silicon steel sheet group, the first conductive portion, the second conductive portion, the conductive portion, and the ground portion can form a radiation energy release path. By using the radiant energy vent path, the radiant energy generated when the coil group of the stator operates can be quickly exported to the outside through the grounding portion, so as to improve the electromagnetic interference protection effect of the motor and the electromagnetic interference protection device of the present invention.

FIG. 1 shows a combined sectional view of a motor according to a first embodiment of the present invention. FIG. 2 is a schematic bottom view of the electromagnetic interference protection device of the motor according to the first embodiment of the present invention. With reference to FIG. 1 and FIG. 2, in one embodiment, the motor 1 includes a base 10, a shaft tube 20, a stator 30, a rotor 40, and a circuit board 50. The motor 1 of the present invention can provide an electromagnetic interference protection function to prevent related electronic components or devices adjacent to the motor 1 from being subjected to electromagnetic interference.

The base 10 can be made of plastic or metal. The shaft tube 20 is disposed on the base 10. The shaft tube 20 includes a first conductive portion 21 and a second conductive portion 22. The first conductive portion 21 and the second conductive portion 22 are arranged between each other. Electrical connection is the principle. Therefore, a variety of different electrical connection methods can be used. For example, different materials that can be electrically connected can be electrically connected to each other, or the same material that can be electrically connected is made in one piece. As shown in the embodiment disclosed in FIG. 1 and FIG. 2, the shaft tube 20 may be a metal hollow shaft tube. The metal hollow shaft tube may be a hollow copper tube to provide better conductivity and conductive effect.

In an embodiment, the metal hollow shaft tube may have an outer peripheral wall 20a and an inner peripheral wall 20b, and the first conductive portion 21 and the second conductive portion 22 are disposed on the outer peripheral wall 20a, whereby the first conductive portion The part 21 and the second conductive part 22 can be electrically connected through the integrally made metal hollow shaft tube, and when the metal hollow shaft tube is selected for the shaft tube 20, in addition to facilitating the assembly and combination of the stator 30, the metal The hollow shaft tube can further increase its conductive area and range to further improve the protection effect of electromagnetic interference.

In an embodiment, the outer peripheral wall 20 a of the shaft tube 20 may be provided with at least one positioning ring 23, and the at least one positioning ring 23 may be tightly coupled to the outer peripheral wall 20 a of the shaft tube 20. Thereby, the at least one positioning ring 23 can be combined with the base 10 by injection molding, that is, in the process of injection molding the base 10, the base 10 can directly cover the at least one positioning ring 23 Using the design of the positioning ring 23 can effectively improve the bonding stability between the base 10 and the shaft tube 20.

The stator 30 includes a silicon steel sheet group 31 and a coil group 32. The silicon steel sheet group 31 is disposed on the shaft tube 20 and is electrically connected to the first conductive portion 21. The silicon steel sheet group 31 can be selected to be tightly coupled to the outer peripheral wall 20a of the shaft tube 20, so that the silicon steel sheet group 31 and the first conductive portion 21 are more likely to form an electrical connection state due to tight bonding. The coil group 32 is wound and combined with the silicon steel sheet group 31. The rotor 40 is rotatably disposed on the shaft tube 20. The rotor 40 has a rotating shaft 41. The rotating shaft 41 can be provided with at least one bearing 42. The at least one bearing 42 can be tightly coupled to the shaft tube 20. The peripheral wall 20 b has an air gap between the stator 30 and the rotor 40. Accordingly, an alternating magnetic field can be generated after the stator 30 is energized, thereby driving the rotor 40 to rotate.

The circuit board 50 can be sleeved on the shaft tube 20. The circuit board 50 is electrically connected to the stator 30. The circuit board 50 has a conductive portion 51 and a ground portion 52. The conductive portion 51 is electrically connected to the stator 30. The second conductive portion 22, the ground portion 52 is electrically connected to the lead portion 51, and the ground portion 52 may use a ground wire or other components having the same function. Thereby, a radiation energy release path P can be formed between the ground portion 52 and the conductive portion 51, the second conductive portion 22, the first conductive portion 21, and the silicon steel sheet group 31.

In addition, the circuit board 50 has a first surface 50a and a second surface 50b opposite to each other. The first surface 50a faces the base 10, the second surface 50b faces the stator 30, and the lead portion 51 may be provided. A bare tin or a bare copper on the first surface 50a to provide better conductivity and conductive effect, and is convenient for bonding or contacting the second conductive portion 22 to form an electrical connection.

FIG. 3 is a schematic diagram showing a planar structure of an electromagnetic interference protection device of a motor according to the present invention and a radiation energy release path thereof. With reference to FIG. 3, using the radiant energy to vent the path P, the stator 30 is used to drive the rotor 40 to rotate. As the stator 30 easily generates a large amount of radiant energy when switching current, electromagnetic interference is formed. The electromagnetic interference It may cause the related electronic components or devices adjacent to the motor 1 to operate abnormally; therefore, the radiant energy release path P can effectively lead the radiant energy generated by the silicon steel sheet group 31 to the outside through the grounding portion 52, and In order to prevent the related electronic components or devices adjacent to the motor 1 of the present invention from being subjected to electromagnetic interference, the protection effect of electromagnetic interference is improved.

Based on the above structural design, several embodiments are further listed in detail below to illustrate various different structural types of the first conductive portion 21 or the second conductive portion 22 of the electromagnetic interference protection device of the motor 1 of the present invention, but not The following examples are limited.

1 and FIG. 2 in cooperation, in this embodiment, the first conductive portion 21 is a surface of the outer peripheral wall 20a of the shaft tube 20, and the silicon steel sheet group 31 can contact the first conductive portion 21; Thereby, when the silicon steel sheet group 31 of the stator 30 is assembled and combined with the outer peripheral wall 20a of the shaft tube 20, it can directly contact the surface of the outer peripheral wall 20a to electrically connect the first conductive portion 21, so that the first conductive portion 21 can be electrically connected. It is convenient to assemble and electrically connect the silicon steel sheet group 31.

In an embodiment, the second conductive portion 22 may be at least one conductive bump 22a, and the at least one conductive bump 22a may be coupled to the conductive portion 51 of the circuit board 50. The bonding method may be soldering, By means of buckling or locking, the at least one conductive bump 22a can be protruded from the outer peripheral wall 20a of the shaft tube 20, and after ensuring that the at least one conductive bump 22a and the circuit board 50 are firmly connected, The conductive bump 22a can directly contact the outer peripheral wall 20a of the shaft tube 20 to form an electrical connection state, so it has both advantages such as good combination stability and improved assembly convenience. In addition, the at least one conductive bump 22a may be a copper block, and the conductive bump may be a block to provide better conductivity and conductive effect.

FIG. 4 shows a sectional view of a motor according to a second embodiment of the present invention. FIG. 5 is a schematic bottom view of an electromagnetic interference protection device for a motor according to a second embodiment of the present invention. With reference to FIGS. 4 and 5, in this embodiment, the second conductive portion 22 may be a conductive elastic piece 22 b, which has an opposite coupling end 221 b and an elastic abutting end 222 b. The coupling end 221 b The connecting portion 51 coupled to the circuit board 50 may also be connected in a manner such as welding, buckling or locking; the elastic abutment end 222b contacts the outer peripheral wall 20a of the shaft tube 20. Thereby, by using the elastic function of the elastic abutment end 222b of the conductive elastic piece 22b, the conductive elastic piece 22b can surely abut the surface of the outer peripheral wall 20a of the shaft tube 20, and the conductive elastic piece 22b and the outer periphery can be prevented A gap is created between the walls 20a to effectively prevent the radiation energy release path P from being interrupted. In an embodiment, the circuit board 50 may be provided with a notch 53, the elastic abutment end 222b of the conductive elastic piece 22b may be arc-shaped, and the elastic abutment end 222b may be accommodated in or adjacent to the notch 53. 53. Since the elastic abutment end 222b is received or adjacent to the gap 53, the notch 53 can be used as an accommodation space when the elastic abutment end 222b of the conductive elastic piece 22b is elastically deformed. In addition, a copper sheet can be used as the conductive elastic sheet 22b to provide better conductivity and conductive effect.

FIG. 6 shows a combined sectional view of a motor according to a third embodiment of the present invention. 7 is a schematic bottom view of an electromagnetic interference protection device for a motor according to a third embodiment of the present invention. With reference to FIG. 6 and FIG. 7, in this embodiment, the second conductive portion 22 may be a conductive ring 22 c which is sleeved on the shaft tube 20 and contacts the outer peripheral wall 20 a. The conductive ring 22 c may be The conductive connection portion 51 selected to be coupled to the circuit board 50 can also be selected by welding, buckling, or locking; the conductive ring 22c can be further coupled to the shaft tube 20 in a tight fit manner. Outer peripheral wall 20a. This makes it easier to form an electrical connection between the conductive ring 22c and the shaft tube 20, and the conductive ring 22c can be directly sleeved on the shaft tube 20 to effectively prevent the conductive ring 22c from the shaft tube 20 The conductive ring 22c can be used to improve the bonding stability between the shaft tube 20 and the circuit board 50, and maintain a good electrical connection relationship. In addition, a copper ring can be used as the conductive ring 22c to provide better conductivity and conductive effect.

FIG. 8 is a sectional view of a motor according to a fourth embodiment of the present invention. FIG. 9 is a schematic bottom view of an electromagnetic interference protection device for a motor according to a fourth embodiment of the present invention. With reference to FIGS. 8 and 9, in this embodiment, the second conductive portion 22 may be a conductive extension block 22 d, the conductive extension block 22 d may be a block or a ring body, and the conductive extension block 22 d may be connected with The shaft tube 20 is integrally formed, and then the second conductive portion 22 is electrically connected to the conductive portion 51 of the circuit board 50 through the conductive extension block 22d. Therefore, by using the design in which the conductive extension block 22d and the shaft tube 20 are integrally formed, the structural complexity of the motor 1 of the present invention can be simplified, and assembly convenience can be improved.

Fig. 10 shows a sectional view of a motor according to a fifth embodiment of the present invention. With reference to FIG. 10, in this embodiment, the at least one positioning ring 23 may be made of a conductive material, and the second conductive portion 22 may be a conductive block 22 e integrally formed with the at least one positioning ring 23. The block 22 e can simultaneously contact the lead portion 51 of the circuit board 50 and the outer peripheral wall 20 a of the shaft tube 20. Therefore, by using the design in which the conductive block 22e and the positioning ring 23 are integrally formed, the combination and stability of the base 10 and the shaft tube 20 can be effectively improved, and the functions of both the conductive block 22e and the positioning ring 23 can be effectively improved. The integration as a whole can further simplify the structural complexity of the motor 1 of the present invention, and can also improve the convenience of assembly.

In the above embodiments, the present invention provides an electromagnetic interference protection device for a motor. With reference to FIG. 3, the electromagnetic interference protection device may include: the shaft tube 20, the silicon steel sheet group 31, and the circuit board 50. The silicon steel sheet group 31, the first conductive portion 21 and the second conductive portion 22 of the shaft tube 20, the conductive portion 51 and the ground portion 52 of the circuit board 50 form the radiation energy release path P, and use The radiant energy release path P of the electromagnetic interference protection device ensures that the radiant energy generated during the operation of the stator 30 can be quickly exported to the outside through the grounding portion 52 to provide a grounding effect, thereby improving the electromagnetic interference protection effect.

The above embodiments are only for explaining the principle of the present invention and its effects, but not for limiting the present invention. Modifications and changes made by those skilled in the art to the above embodiments still do not violate the spirit of the present invention. The scope of rights of the present invention should be listed in the scope of patent application described later.

1‧‧‧ Motor

10‧‧‧ base

20‧‧‧ shaft tube

20a‧‧‧outer wall

20b‧‧‧Inner peripheral wall

21‧‧‧The first conductive part

22‧‧‧Second conductive section

22a‧‧‧Conductive bump

22b‧‧‧Conductive shrapnel

22c‧‧‧Conductive ring

22d‧‧‧Conductive extension block

22e‧‧‧Conductive block

23‧‧‧ positioning ring

30‧‧‧ stator

31‧‧‧ Silicon steel sheet set

32‧‧‧coil set

40‧‧‧rotor

41‧‧‧Shaft

42‧‧‧bearing

50‧‧‧Circuit Board

50a‧‧‧first surface

50b‧‧‧Second surface

51‧‧‧ Guide Department

52‧‧‧ Ground

53‧‧‧ gap

221b‧‧‧Combined

222b‧‧‧Flexible abutment end

P‧‧‧ radiation energy release path

FIG. 1 shows a combined sectional view of a motor according to a first embodiment of the present invention;

2 is a schematic bottom view of the electromagnetic interference protection device of the motor according to the first embodiment of the present invention;

3 is a schematic diagram showing a planar structure of an electromagnetic interference protection device of a motor of the present invention and a radiation energy release path thereof;

FIG. 4 shows a combined sectional view of a motor according to a second embodiment of the present invention;

5 is a schematic bottom view of an electromagnetic interference protection device for a motor according to a second embodiment of the present invention;

FIG. 6 shows a combined sectional view of a motor according to a third embodiment of the present invention;

7 is a schematic bottom view of an electromagnetic interference protection device for a motor according to a third embodiment of the present invention;

FIG. 8 shows a combined sectional view of a motor according to a fourth embodiment of the present invention;

9 is a schematic bottom view of an electromagnetic interference protection device for a motor according to a fourth embodiment of the present invention; and

Fig. 10 shows a sectional view of a motor according to a fifth embodiment of the present invention.

Claims (31)

A motor includes: a base; a shaft tube disposed on the base, the shaft tube including a first conductive portion and a second conductive portion, the first conductive portion and the second conductive portion being electrically connected; A silicon steel sheet group and a coil group, the silicon steel sheet group is disposed on the shaft tube and is electrically connected to the first conductive part, the coil group is wound and combined with the silicon steel sheet group; a rotor is rotatably disposed on the The shaft tube; and a circuit board, which is electrically connected to the stator, the circuit board has a conductive portion and a ground portion, the conductive portion is electrically connected to the second conductive portion, and the ground portion is electrically connected to the conductive portion接 部。 Connection department. For example, the motor of claim 1, wherein the shaft tube is a metal hollow shaft tube, the metal hollow shaft tube has an outer peripheral wall and an inner peripheral wall, and the first conductive portion and the second conductive portion are disposed on the outer peripheral wall. The silicon steel sheet group is disposed on the outer peripheral wall of the shaft tube. According to the motor of claim 2, wherein the first conductive portion is a surface of the outer peripheral wall of the shaft tube, and the silicon steel sheet group contacts the first conductive portion. The motor according to item 2 of the claim, wherein the second conductive portion is at least one conductive bump, the at least one conductive bump is combined with the conductive portion of the circuit board, and the at least one conductive bump is convexly disposed on The outer peripheral wall of the shaft tube. The motor of item 4, wherein the at least one conductive bump is a copper block. The motor of claim 4, wherein the conductive bump is a block. For example, the motor of item 2, wherein the second conductive part is a conductive elastic piece, and the conductive elastic piece has an opposite coupling end and an elastic abutment end, and the coupling end is coupled to the conductive portion of the circuit board. , The elastic abutting end contacts the outer peripheral wall of the shaft tube. The motor of claim 7, wherein the conductive elastic piece is a copper piece. For example, the motor of claim 7, wherein the circuit board is provided with a gap, and the elastic abutment end of the conductive elastic piece is arc-shaped, and the elastic abutment end accommodates or is adjacent to the gap. According to the motor of claim 2, wherein the second conductive portion is a conductive ring, the conductive ring is sleeved on the shaft tube and contacts the outer peripheral wall, and the conductive ring is combined with the conductive portion of the circuit board. The motor of claim 10, wherein the conductive ring is a copper ring. According to the motor of claim 2, wherein the second conductive portion is a conductive extension block, the conductive extension block is integrally formed with the shaft tube. The motor according to item 12, wherein the conductive extension block is a block or a ring. For example, the motor according to item 2, wherein the outer peripheral wall of the shaft tube is provided with at least one positioning ring, and the at least one positioning ring is used to be combined with the base shot package molding. According to the motor of claim 14, wherein the at least one positioning ring is made of conductive material, the second conductive portion is a conductive block integrally formed with the at least one positioning ring, and the conductive block contacts the circuit board. The guide portion and the outer peripheral wall of the shaft tube. For example, the motor of claim 1, wherein the circuit board has a first surface and a second surface opposite to each other, the first surface is facing the base, the second surface is facing the stator, and the connecting portion is provided. A bare tin or a bare copper on the first surface is used to bond or contact the second conductive portion. According to the motor of claim 2, wherein the rotor has a rotating shaft, the rotating shaft is provided with at least one bearing, and the at least one bearing is coupled to the inner peripheral wall of the shaft tube. An electromagnetic interference protection device for a motor includes: a shaft tube having a first conductive portion and a second conductive portion, the first conductive portion and the second conductive portion being electrically connected; a silicon steel sheet set disposed on The shaft tube is electrically connected to the first conductive portion; and a circuit board is disposed outside the shaft tube. The circuit board has a conductive portion and a ground portion, and the conductive portion is electrically connected to the second conductive portion. , The ground portion is electrically connected to the lead portion. For example, the electromagnetic interference protection device for a motor according to item 18, wherein the shaft tube is a metal hollow shaft tube, the metal hollow shaft tube has an outer peripheral wall and an inner peripheral wall, the first conductive portion and the second The conductive part is disposed on the outer peripheral wall, and the silicon steel sheet group is disposed on the outer peripheral wall of the shaft tube. For example, the electromagnetic interference protection device for a motor according to item 19, wherein the first conductive portion is a surface of the outer peripheral wall of the shaft tube, and the silicon steel sheet group contacts the first conductive portion. If the electromagnetic interference protection device for a motor according to claim 19, wherein the second conductive portion is at least one conductive bump, the at least one conductive bump is combined with the conductive portion of the circuit board, and the at least one A conductive bump is protruded from the outer peripheral wall of the shaft tube. For example, the electromagnetic interference protection device for a motor according to claim 21, wherein the conductive bump is a copper block. For example, the electromagnetic interference protection device for a motor according to claim 21, wherein the conductive bump is a block. For example, the electromagnetic interference protection device for a motor according to claim 19, wherein the second conductive portion is a conductive elastic piece, the conductive elastic piece has an opposite coupling end and an elastic abutment end, and the coupling end is coupled to the The conductive contact portion of the circuit board, the elastic abutting end contacts the outer peripheral wall of the shaft tube. For example, the electromagnetic interference protection device for a motor according to item 24, wherein the conductive elastic piece is a copper piece. For example, the electromagnetic interference protection device for a motor according to item 24, wherein the circuit board is provided with a gap, and the elastic abutment end of the conductive elastic sheet is arc-shaped, and the elastic abutment end is accommodated or adjacent to the gap. For example, the electromagnetic interference protection device for a motor according to item 19, wherein the second conductive part is a conductive ring, the conductive ring is sleeved on the shaft tube and contacts the outer peripheral wall, and the conductive ring is combined with the circuit The guide portion of the board. The electromagnetic interference protection device for a motor according to claim 27, wherein the conductive ring is a copper ring. For example, the electromagnetic interference protection device for a motor according to item 19, wherein the second conductive part is a conductive extension block, and the conductive extension block is integrally formed with the shaft tube. The electromagnetic interference protection device for a motor according to claim 29, wherein the conductive extension block is a block or a ring. For example, the electromagnetic interference protection device for a motor according to item 18, wherein the conductive portion of the circuit board is a bare tin or a bare copper for bonding or contacting the second conductive portion.