Brushed motor

Abstract

The present invention discloses a brushed motor, comprising a stator assembly, a rotor assembly, a carbon brush assembly, and a housing. The stator assembly comprises a stator core and a stator winding wound on the stator core. The stator core is also provided with a commutator segment electrically connected to the stator winding. The rotor assembly is located inside the stator core and comprises a rotor core, a rotating shaft passing through the rotor core, and a magnet provided on the rotor core. The carbon brush assembly is mounted on the rotor assembly and contacts the commutator segment. The stator assembly is mounted on the housing. By changing the winding from being wound on the rotor to being wound on the stator core, the stator winding can be directly dissipated through the housing, thus achieving better heat dissipation performance. By using magnets and strong magnetic materials in the rotor assembly, the volume of the magnets can be reduced, thereby effectively improving the power density of the brushed DC motor. In addition, the rotor assembly does not require winding, which reduces the overall size, makes it easier to meet dynamic balancing requirements, and reduces the process difficulty of motor manufacturing.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a brushed motor. Background Art

[0002] A brushed DC motor is a type of DC motor with fixed main magnetic poles and brushes mounted on the stator, and armature windings and a commutator mounted on the rotor. Electric energy from a DC power source flows through the brushes and commutator into the armature windings, generating armature current. The magnetic field generated by the armature current interacts with the main magnetic field to produce electromagnetic torque, which rotates the motor and drives the load.

[0003] In current brushed DC motors, on the one hand, since the armature winding is located in the internal rotor, the heat of the winding can only be conducted to the end cover through the internal air, resulting in poor heat dissipation. In addition, the rotor has a large diameter after winding, high dynamic balance requirements, and high manufacturing process difficulty. On the other hand, the permanent magnet is set in the stator of the motor's outer ring and needs to occupy a certain proportion of the stator circumference. The large size of the permanent magnet leads to a low power density of the motor. Summary of the Invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a brushed motor with good heat dissipation performance, which can effectively improve the power density of the brushed DC motor.

[0005] An embodiment of the present invention provides a brushed motor, comprising a stator assembly, a rotor assembly, a carbon brush assembly, and a housing, wherein:

[0006] The stator assembly includes a stator core and a stator winding wound on the stator core, and the stator core is also provided with a commutator segment electrically connected to the stator winding;

[0007] The rotor assembly is located inside the stator core, and the rotor assembly includes a rotor core, a rotating shaft passing through the rotor core, and a magnetic steel arranged on the rotor core;

[0008] The carbon brush assembly is mounted on the rotor assembly and contacts the commutator segment;

[0009] The stator assembly is mounted on the casing.

[0010] The brushed motor provided according to the embodiment of the present invention has at least the following beneficial effects: by changing the winding layout of the traditional brushed motor, the winding is changed from being wound on the rotor to being wound on the stator core, and the stator assembly is installed on the casing, the stator winding can dissipate heat directly or through the casing, and has good heat dissipation performance; by using magnetic steel in the rotor assembly, and using strong magnetic materials, the volume of the magnetic steel is reduced, which can effectively improve the power density of the brushed DC motor. In addition, the rotor assembly does not require winding, which reduces the overall size, makes it easier to meet dynamic balancing requirements, and reduces the process difficulty of motor manufacturing.

[0011] In the above-mentioned brushed motor, the carbon brush assembly includes a carbon brush holder fixed to the rotor core or the rotating shaft, a carbon brush cover arranged on the carbon brush holder, and a carbon brush arranged inside the carbon brush cover, wherein the opening of the carbon brush cover faces the commutator segment.

[0012] The carbon brush assembly is fixed to the rotor core or rotating shaft through a carbon brush holder, so that the carbon brush assembly rotates with the rotor assembly; the carbon brush is arranged inside the carbon brush sleeve, and the opening of the carbon brush sleeve faces the commutator segment. During the rotation of the carbon brush assembly, the carbon brush can contact different commutator segments to achieve winding commutation.

[0013] In the above-mentioned brushed motor, the carbon brush holder is fixed to the rotating shaft, a first through hole for the rotating shaft to pass through is provided in the middle of the carbon brush holder, and the carbon brush holder is tightly connected to the rotating shaft through the first through hole.

[0014] By arranging a first through hole in the middle of the carbon brush holder, the rotating shaft can pass through the first through hole, so that the carbon brush holder is fixed on the rotor assembly and rotates along with the rotor assembly.

[0015] In the above-mentioned brushed motor, the carbon brush holder is provided with a mounting block for mounting the carbon brush sleeve, and the carbon brush sleeve is sleeved on the mounting block.

[0016] In the above-mentioned brushed motor, the stator core includes a central ring and stator teeth arranged outside the central ring, a stator slot is formed between two adjacent stator teeth, and the commutator segments are arranged on the central ring.

[0017] In the above-mentioned brushed motor, the inner wall of the middle ring is provided with a first electrode and a second electrode, and the carbon brush sleeve is provided with a first mounting groove facing the commutator segment, a second mounting groove facing the first electrode, and a third mounting groove facing the second electrode.

[0018] In the above-mentioned brushed motor, the first mounting slot is provided with the carbon brush, and the second mounting slot or the third mounting slot is provided with the carbon brush.

[0019] In the brushed motor, a plurality of carbon brush sleeves are provided on the carbon brush holder, the carbon brush is provided in the second mounting groove of one of two adjacent carbon brush sleeves, and the carbon brush is provided in the third mounting groove of the other carbon brush sleeve.

[0020] In the above-mentioned brushed motor, a first electrode and a second electrode are provided inside the housing, and the carbon brush sleeve is provided with a first mounting groove facing the commutator segment, a second mounting groove facing the first electrode, and a third mounting groove facing the second electrode.

[0021] In the above-mentioned brushed motor, the casing includes a middle shell that is sleeved on the stator assembly, and an upper end cover and a lower end cover respectively arranged at both ends of the middle shell. The upper end cover and the lower end cover are both provided with bearing seats, and the bearing seats are internally provided with bearings for the rotating shaft to pass through.

[0022] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation to the technical solution of the present invention.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0025] Figure 1 1 is a structural diagram of a brushed motor provided by an embodiment of the present invention;

[0026] Figure 2 is an exploded view of a brushed motor provided by an embodiment of the present invention;

[0027] Figure 3 2 is another exploded view of a brushed motor provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0028] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0029] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] An embodiment of the present invention provides a brushed motor having good heat dissipation performance and capable of effectively improving the power density of the brushed DC motor.

[0032] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0033] Reference Figures 1 to 3 An embodiment of the present invention provides a brushed motor, comprising a stator assembly 100, a rotor assembly 200, a carbon brush assembly 300 and a housing 400, wherein:

[0034] The stator assembly 100 includes a stator core 110 and a stator winding wound on the stator core 110. The stator core 110 is also provided with a commutator segment 120 electrically connected to the stator winding.

[0035] The rotor assembly 200 is located inside the stator core 110 and includes a rotor core 210 , a rotating shaft 220 passing through the rotor core 210 , and magnets disposed on the rotor core 210 .

[0036] The carbon brush assembly 300 is mounted on the rotor assembly 200 and contacts the commutator segment 120 ;

[0037] The stator assembly 100 is mounted on the housing 400 .

[0038] According to the brushed motor provided by the embodiment of the present invention, the winding layout of the traditional brushed motor is changed, and the winding is changed from being wound on the rotor to being wound on the stator core 110. The stator assembly 100 is installed on the housing 400. The stator winding can dissipate heat directly or through the housing 400, and has good heat dissipation performance; by using magnetic steel in the rotor assembly 200, and strong magnetic materials can be used, the volume of the magnetic steel is reduced, which can effectively improve the power density of the brushed DC motor. In addition, the rotor assembly 200 does not require winding, which reduces the overall size, makes it easier to meet the dynamic balance requirements, and reduces the process difficulty of motor manufacturing.

[0039] It is understandable that the magnetic steel can be embedded in the rotor core 210 or surface-mounted on the rotor core 210 .

[0040] Reference Figure 2 and Figure 3 In the above-mentioned brushed motor, the carbon brush assembly 300 includes a carbon brush holder 310 fixed to the rotor core 210 or the rotating shaft 220, a carbon brush cover 320 arranged on the carbon brush holder 310, and a carbon brush arranged inside the carbon brush cover 320, and the opening of the carbon brush cover 320 faces the commutator segment 120.

[0041] The carbon brush assembly 300 is fixed to the rotor core 210 or the rotating shaft 220 through the carbon brush holder 310, so that the carbon brush assembly 300 rotates with the rotor assembly 200; the carbon brushes are arranged inside the carbon brush cover 320, and the opening of the carbon brush cover 320 faces the commutator segment 120. During the rotation of the carbon brush assembly 300, the carbon brushes can contact different commutator segments 120 to achieve winding commutation.

[0042] It should be noted that the carbon brush holder 310 is made of insulating material, such as plastic; the carbon brush cover 320 is made of conductive material, such as copper; the carbon brush holder 310 may be provided with multiple carbon brush covers 320, such as Figure 2 In the embodiment, four carbon brush covers 320 are provided on the carbon brush holder 310 .

[0043] Reference Figure 2 and Figure 3 In the above-mentioned brushed motor, the carbon brush holder 310 is fixed to the rotating shaft 220. A first through hole 311 for the rotating shaft 220 to pass through is provided in the middle of the carbon brush holder 310. The carbon brush holder 310 is tightly connected to the rotating shaft 220 through the first through hole 311.

[0044] By providing a first through hole 311 in the middle of the carbon brush holder 310 , the rotating shaft 220 can pass through the first through hole 311 , so that the carbon brush holder 310 is fixed on the rotor assembly 200 and rotates along with the rotor assembly 200 .

[0045] In the above-mentioned brushed motor, the carbon brush holder 310 is provided with a mounting block 312 for mounting the carbon brush cover 320 , and the carbon brush cover 320 is sleeved on the mounting block 312 .

[0046] Reference Figure 2 and Figure 3 In the illustrated embodiment, the carbon brush holder 310 is provided with four mounting blocks 312 , and four carbon brush covers 320 are correspondingly provided. The four carbon brush covers 320 are respectively sleeved in the four mounting blocks 312 .

[0047] Reference Figure 3 In the above-mentioned brushed motor, the stator core 110 includes a central ring 111 and stator teeth 112 arranged outside the central ring 111 , a stator slot is formed between two adjacent stator teeth 112 , and the commutator segment 120 is arranged on the central ring 111 .

[0048] The stator winding is wound on the stator teeth 112, and the ends of the stator winding are electrically connected to the commutator segments 120 of the middle ring 111. The commutator segments 120 are arranged on the middle ring 111. The carbon brush assembly 300 is located inside the middle ring 111 of the stator core 110. The opening of the carbon brush cover 320 faces the commutator segments 120, so that the carbon brushes in the carbon brush cover 320 can contact the commutator segments 120 on the middle ring 111. Moreover, as the rotor assembly 200 rotates, the carbon brush cover 320 also faces different commutator segments 120, so that the carbon brushes contact different commutator segments 120.

[0049] Reference Figure 2 and Figure 3 In the above-mentioned brushed motor, the inner wall of the middle ring 111 is provided with a first electrode 500 and a second electrode 600, and the carbon brush cover 320 is provided with a first mounting groove 321 facing the commutator segment 120, a second mounting groove 322 facing the first electrode 500, and a third mounting groove 323 facing the second electrode 600.

[0050] In this embodiment, the first electrode 500 and the second electrode 600 are arranged on the inner wall of the middle ring 111; it is understandable that the first electrode 500 and the second electrode 600 can also be arranged at other positions as long as they can contact the carbon brushes in the carbon brush cover 320.

[0051] In the above-mentioned brushed motor, the first mounting slot 321 is provided with a carbon brush, and the second mounting slot 322 or the third mounting slot 323 is provided with a carbon brush.

[0052] It is understandable that, in the same carbon brush sleeve 320 , generally only two carbon brushes are provided, one of which is used to connect to the commutator segment 120 , and the other is used to connect to the first electrode 500 or the second electrode 600 .

[0053] In the brushed motor, a plurality of carbon brush sleeves 320 are provided on the carbon brush holder 310 . A carbon brush is provided in the second mounting slot 322 of one of two adjacent carbon brush sleeves 320 , and a carbon brush is provided in the third mounting slot 323 of the other carbon brush sleeve 320 .

[0054] In the brushed motor, a first electrode 500 and a second electrode 600 are provided inside the housing 400 , and the carbon brush cover 320 is provided with a first mounting groove 321 facing the commutator segment 120 , a second mounting groove 322 facing the first electrode 500 , and a third mounting groove 323 facing the second electrode 600 .

[0055] Different from the above embodiment in which the first electrode 500 and the second electrode 600 are disposed on the inner wall of the middle ring 111 , in this embodiment, the first electrode 500 and the second electrode 600 are disposed inside the housing 400 .

[0056] Reference Figures 1 to 3 In the above-mentioned brushed motor, the housing 400 includes a middle housing 410 that is sleeved on the stator assembly 100, and an upper end cover 420 and a lower end cover 430 respectively arranged at both ends of the middle housing 410. The upper end cover 420 and the lower end cover 430 are both provided with bearing seats, and the bearing seats are provided with bearings for the rotating shaft 220 to pass through.

[0057] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the scope of the present invention.

Claims

1. A brushed motor, characterized in that: include: A stator assembly, the stator assembly comprising a stator core and a stator winding wound on the stator core, the stator core further being provided with a commutator segment electrically connected to the stator winding; the stator core comprising a central ring and stator teeth disposed outside the central ring, a stator slot being formed between adjacent stator teeth, and the commutator segment being disposed on the central ring; A rotor assembly, the rotor assembly being located inside the stator core, the rotor assembly comprising a rotor core, a rotating shaft passing through the rotor core, and a magnet disposed on the rotor core; a carbon brush assembly comprising a carbon brush holder fixed to the rotor core or the rotating shaft, a carbon brush sleeve disposed on the carbon brush holder, and a carbon brush disposed within the carbon brush sleeve; an opening of the carbon brush sleeve faces the commutator segment so that the carbon brush contacts the commutator segment; The housing comprises a middle housing sleeved on the stator assembly, an upper end cover and a lower end cover respectively provided at both ends of the middle housing, the upper end cover and the lower end cover are both provided with bearing seats, and the bearing seats are internally provided with bearings for the rotating shaft to pass through; In which, the inner wall of the middle ring is provided with a first electrode and a second electrode, and the carbon brush sleeve is provided with a first mounting groove facing the commutator segment, a second mounting groove facing the first electrode, and a third mounting groove facing the second electrode respectively; the first mounting groove is provided with the carbon brush, and the second mounting groove or the third mounting groove is provided with the carbon brush; a plurality of the carbon brush sleeves are provided on the carbon brush bracket, and the second mounting groove of one of the two adjacent carbon brush sleeves is provided with the carbon brush, and the third mounting groove of the other carbon brush sleeve is provided with the carbon brush.

2. The brushed motor according to claim 1, characterized in that: The carbon brush holder is fixed to the rotating shaft. A first through hole for the rotating shaft to pass through is provided in the middle of the carbon brush holder. The carbon brush holder is tightly connected to the rotating shaft through the first through hole.

3. The brushed motor according to claim 1, wherein: The carbon brush holder is provided with a mounting block for mounting the carbon brush sleeve, and the carbon brush sleeve is sleeved on the mounting block.

4. The brushed motor according to claim 1, wherein: A first electrode and a second electrode are provided inside the housing, and the carbon brush sleeve is provided with a first mounting groove facing the commutator segment, a second mounting groove facing the first electrode, and a third mounting groove facing the second electrode.

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