High-voltage brushless outer rotor motor

Abstract

The utility model discloses a high-voltage brushless outer rotor motor, relates to the field of brushless motors, solves the problem that a brushless motor in the prior art cannot meet the requirement for the electrical insulation distance of the high-voltage brushless outer rotor motor, and mainly provides the high-voltage brushless outer rotor motor. Comprising a rotor assembly and a stator assembly, the rotor assembly comprises rotor magnetic steel, a rotating shaft, a machine shell, a shaft sleeve and a first insulation sleeve, the first insulation sleeve is arranged between the machine shell and the shaft sleeve and fixes the shaft sleeve to the machine shell, the shaft sleeve and the rotating shaft are circumferentially fixed, the rotor magnetic steel is installed on the inner wall of the machine shell, and the rotor magnetic steel is wrapped with a second insulation sleeve. According to the brushless external rotor motor, the creepage distance between the casing and the stator assembly is increased by the second insulating sleeve wrapped outside the rotor magnetic steel, so that the creepage distance conforms to the minimum electric appliance distance, and compared with a common brushless external rotor motor, the brushless external rotor motor can accommodate higher voltage input under the same volume; or the size can be made smaller under the same voltage input.

Description

Technical Field

[0001] The utility model relates to the field of brushless motors, in particular to a high-voltage brushless outer rotor motor. Background Art

[0002] Brushless motors use a set of electronic devices to sense the position of the permanent magnet poles through Hall elements. Based on this perception, electronic circuits are used to switch the direction of the current in the coil in a timely manner to ensure that the magnetic force in the correct direction is generated to drive the motor. Brushless motors are widely used in gardening, electric and other fields of the national economy. They are loved by consumers for their small size and high efficiency. The proportion of high-voltage brushless products has increased significantly, and the demand for high-voltage brushless outer rotor motors has also increased accordingly.

[0003] However, the brushless motor in the prior art cannot meet the electrical insulation distance requirements of the high-voltage brushless outer rotor motor, and the same structure is not applicable to the high-voltage brushless outer rotor motor. Utility Model Content

[0004] The purpose to be achieved by the utility model is to provide a high-voltage brushless outer rotor motor, which solves the problem that the conventional single-insulation brushless outer rotor motor cannot meet the minimum creepage distance and electrical clearance, and meets the electrical insulation distance by increasing the creepage distance of the casing and the stator assembly.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a high-voltage brushless outer rotor motor, including a rotor assembly and a stator assembly, the rotor assembly including a rotor magnet, a rotating shaft, a casing, a shaft sleeve and a first insulating sleeve, the first insulating sleeve is arranged between the casing and the shaft sleeve, and the shaft sleeve is fixed to the casing, the shaft sleeve is circumferentially fixed to the rotating shaft, the rotor magnet is installed on the inner wall of the casing, the rotor assembly also includes a second insulating sleeve, the rotor magnet is sleeved on the second insulating sleeve, and the outer circumferential sides of the second insulating sleeve are respectively provided with radially outwardly extending bosses, and the rotor magnet is clamped between the two bosses.

[0006] After adopting the above technical solution, the utility model has the following advantages: the second insulating sleeve wrapped around the rotor magnetic steel increases the creepage distance between the casing and the stator assembly, so that the creepage distance meets the minimum electrical distance. Compared with ordinary brushless outer rotor motors, it can accommodate higher voltage input at the same volume, or can make the volume smaller at the same voltage input.

[0007] Furthermore, the first insulating sleeve extends along the axial direction of the rotating shaft to form a first extending portion, and the first extending portion and the second insulating sleeve at least partially overlap in the axial direction of the rotating shaft.

[0008] By adopting the above-mentioned technical solution, the first extension portion of the first insulating sleeve and the second insulating sleeve of the rotor magnet cooperate with each other, making it more difficult for the stator assembly and the rotating shaft to penetrate the air. Because the first extension portion and the second insulating sleeve at least partially overlap in the axial direction of the rotating shaft, the arc from the stator assembly to the rotating shaft needs to bypass the first extension portion to be conducted, thereby increasing the creepage distance between the stator assembly and the rotating shaft, making the creepage distance meet the minimum electrical distance, and further protecting the safety of the motor.

[0009] Furthermore, the stator assembly includes a stator base and a stator forming assembly sleeved on the stator base, and a third insulating sleeve is provided between the stator base and the stator forming assembly.

[0010] By adopting the above-mentioned technical solution, the third insulating sleeve increases the creepage distance between the stator forming assembly and the rotating shaft, so that the creepage distance meets the minimum electrical distance. Compared with ordinary brushless outer rotor motors, under the same input voltage, the straight-line distance between the stator forming assembly and the rotating shaft can be shorter, and under the same distance between the stator forming assembly and the rotating shaft, the input voltage that can be carried is higher.

[0011] Furthermore, one end of the third insulating sleeve close to the shaft sleeve extends axially along the rotating shaft to form a second extending portion, and the second extending portion at least partially overlaps with the first extending portion in the axial direction of the rotating shaft.

[0012] By adopting the above-mentioned technical solution, the second extension portion and the first extension portion of the first insulating sleeve cooperate with each other, making it more difficult for the stator forming assembly and the rotating shaft to penetrate the air. Because the first extension portion and the second extension portion at least partially overlap in the axial direction of the rotating shaft, the arc from the stator forming assembly to the rotating shaft needs to bypass the first extension portion and the second extension portion to be conductive, thereby increasing the creepage distance between the stator forming assembly and the rotating shaft, making the creepage distance meet the minimum electrical distance, and further protecting the safety of the motor.

[0013] Furthermore, one end of the third insulating sleeve away from the shaft sleeve extends axially along the rotating shaft to form a third extending portion.

[0014] By adopting the above-mentioned technical solution, the cooperation between the second extension part and the first extension part increases the creepage distance between the stator forming assembly and one side of the rotating shaft, while the third extension part increases the creepage distance between the stator forming assembly and the other side of the rotating shaft, so that the creepage distances on both sides meet the minimum electrical distance, further protecting the safety performance of the motor.

[0015] Furthermore, the rotating shaft sleeve is provided with a first bearing, one end of the first bearing is against the first extension portion, and the other end of the first bearing is positioned with a shoulder of the rotating shaft.

[0016] By adopting the above technical solution, the first bearing and the first extension part abut against the shoulder of the rotating shaft, so that the first bearing is positioned in the axial direction, making the first bearing more stable during operation.

[0017] Furthermore, the material of the second insulating sleeve is pps, and the second insulating sleeve and the rotor magnetic steel are an integral injection-molded structure, or the second insulating sleeve and the rotor magnetic steel are a spray-molded structure.

[0018] By adopting the above-mentioned technical solution, PPS as an insulating material can be used in two ways: one-piece injection molding and spray molding, which can meet the needs of various production scenarios.

[0019] Furthermore, the material of the first insulating sleeve is alumina ceramic.

[0020] By adopting the above-mentioned technical solution, the use of alumina ceramics can make the insulating sleeve have greater rigidity on the basis of insulation, making the shaft more stable during operation and further improving its service life.

[0021] Furthermore, a fan blade is provided on the outer side of the first insulating sleeve.

[0022] By adopting the above technical solution, the creepage distance between the stator assembly and the fan blades meets the minimum electrical distance.

[0023] Furthermore, the creepage distance from the rotating shaft to the casing is L1, the creepage distance from the fan blade to the first bearing is L2+L3, the creepage distance from the fan blade to the rotating shaft is L4, the creepage distance from the casing to the stator assembly is L5+L6, and the creepage distance from the fan blade to the stator assembly is L7. The above L1, L2+L3, L4, L5+L6 and L7 are all greater than 4 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings:

[0025] Figure 1 It is a cross-sectional view of a high-voltage brushless outer rotor motor of the utility model;

[0026] Figure 2 It is a cross-sectional view of a stator in a high-voltage brushless outer rotor motor and an enlarged view of point A;

[0027] Figure 3 It is a right side view of a stator in a high voltage brushless outer rotor motor;

[0028] Figure 4 A cross-sectional view of a rotor in a high-voltage brushless outer rotor motor;

[0029] Figure 5 It is a right side view of a rotor in a high voltage brushless outer rotor motor;

[0030] Figure 6 A three-dimensional diagram of a high-voltage brushless outer rotor motor.

[0031] Figure numerals: 1. rotor assembly; 11. rotor magnet; 12. rotating shaft; 121. shaft shoulder; 13. casing; 14. sleeve; 15. insulating sleeve; 151. first extension portion; 2. stator assembly; 21. stator base; 22. stator forming assembly; 3. second insulating sleeve; 31. boss; 4. third insulating sleeve; 41. second extension portion; 42. third extension portion; 5. first bearing; 6. second bearing; 7. fan blade. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0033] The terms "first", "second", etc. (if any) in the specification and claims of the present utility model are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish a certain technical feature, it does not necessarily mean that it has "first". It should be understood that in the present utility model, "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. It should be understood that in the present utility model, "multiple" refers to two or more. "And / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0034] The following specific embodiments are used to describe the technical solution of the utility model in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0035] like Figures 1 to 6As shown, the utility model provides a high-voltage brushless outer rotor motor, including a rotor assembly 1 and a stator assembly 2, the rotor assembly 1 including a rotor magnet 11, a rotating shaft 12, a casing 13, a sleeve 14 and a first insulating sleeve 15, the first insulating sleeve 15 is arranged between the casing 13 and the sleeve 14, and the sleeve 14 is fixed to the casing 13, the sleeve 14 and the rotating shaft 12 are circumferentially fixed, the rotor magnet 11 is installed on the inner wall of the casing 13, the rotor assembly 1 also includes a second insulating sleeve 3, the rotor magnet 11 is sleeved on the second insulating sleeve 3, and the outer circumferential sides of the second insulating sleeve 3 are respectively provided with bosses 31 extending radially outward, and the rotor magnet 11 is clamped between the two bosses 31.

[0036] After adopting the above technical solution, the utility model has the following advantages: the second insulating sleeve 3 wrapped around the rotor magnet 11 increases the creepage distance between the housing 13 and the stator assembly 2, and can accommodate a higher voltage input at the same volume compared to ordinary brushless outer rotor motors, or can make the volume smaller at the same voltage input. Specifically, the creepage distance L5+L6 between the housing 13 and the stator assembly 2 is much greater than 4mm, and the creepage distance L1 from the shaft 12 to the housing 13 must be greater than 4mm, which meets the minimum creepage distance and electrical clearance of high-voltage motor products.

[0037] Furthermore, in order to provide better motor performance, the first insulating sleeve 15 is extended axially along the rotating shaft 12 to form a first extending portion 151 , and the first extending portion 151 at least partially overlaps with the second insulating sleeve 3 in the axial direction of the rotating shaft 12 .

[0038] By adopting the above-mentioned technical solution, the first extension portion 151 of the first insulating sleeve and the second insulating sleeve 3 of the rotor magnet 11 cooperate with each other, making it more difficult for the stator assembly 2 and the rotating shaft 12 to penetrate the air. Because the first extension portion 151 and the second insulating sleeve 3 at least partially overlap in the axial direction of the rotating shaft 12, the arc from the stator assembly 2 to the rotating shaft 12 needs to bypass the first extension portion 151 to be conducted, thereby increasing the creepage distance between the stator assembly 2 and the rotating shaft 12, further protecting the safety of the motor.

[0039] Furthermore, the volume of the motor is reduced, so that the stator assembly 2 includes a stator base 21 and a stator molding assembly 22 sleeved on the stator base 21 , and a third insulating sleeve 4 is provided between the stator base 21 and the stator molding assembly 22 .

[0040] By adopting the above-mentioned technical solution, the third insulating sleeve 4 increases the creepage distance between the stator forming component 22 and the rotating shaft 12. Compared with the ordinary brushless outer rotor motor, under the same input voltage, the straight-line distance between the stator forming component 22 and the rotating shaft 12 can be shorter, and under the same distance between the stator forming component 22 and the rotating shaft 12, the input voltage that can be carried is higher.

[0041] In another embodiment, the stator molding assembly 22 is fixedly mounted on the stator base 21 .

[0042] Furthermore, in order to increase the safety of the motor, one end of the third insulating sleeve 4 close to the shaft sleeve 14 is extended axially along the shaft 12 to form a second extension portion 41 , and the second extension portion 41 at least partially overlaps with the first extension portion 151 in the axial direction of the shaft 12 .

[0043] By adopting the aforementioned technical solution, the second extension portion 41 and the first extension portion 151 of the first insulating sleeve cooperate with each other, making it more difficult for the stator forming component 22 and the rotating shaft 12 to penetrate the air. Because the first extension portion 151 and the second extension portion 41 at least partially overlap in the axial direction of the rotating shaft 12, the arc from the stator forming component 22 to the rotating shaft 12 needs to bypass the first extension portion 151 and the second extension portion 41 to be conductive, thereby increasing the creepage distance between the stator forming component 22 and the rotating shaft 12 and further protecting the safety of the motor.

[0044] Furthermore, one end of the third insulating sleeve 4 away from the shaft sleeve 14 extends axially along the rotating shaft 12 to form a third extending portion 42 .

[0045] By adopting the above-mentioned technical solution, the cooperation between the second extension portion 41 and the first extension portion 151 increases the creepage distance between the stator forming component 22 and one side of the rotating shaft 12, while the third extension portion 42 increases the creepage distance between the stator forming component 22 and the other side of the rotating shaft 12, further protecting the safety performance of the motor.

[0046] Furthermore, in order to position the bearing on the rotating shaft, the rotating shaft 12 is provided with a first bearing 5 , one end of the first bearing 5 abuts against the first extension portion 151 , and the other end of the first bearing 5 abuts against the shoulder 121 of the rotating shaft 12 .

[0047] By adopting the above technical solution, the first bearing 5 and the first extension portion 151 abut against the shoulder 121 of the rotating shaft 12, so that the first bearing 5 is positioned in the axial direction, making the first bearing 5 more stable during operation.

[0048] Specifically, a second bearing 6 is installed on the rotating shaft, the inner ring of the second bearing 6 abuts against the shaft shoulder 121 of the rotating shaft 12, and the outer ring of the second bearing 6 on the same side abuts against the stator base 21, so as to complete the positioning.

[0049] Furthermore, in order to adapt to various production and processing environments, the material of the second insulating sleeve 3 is pps, and the second insulating sleeve 3 and the rotor magnetic steel 11 are an integral injection molding structure.

[0050] In another embodiment, the second insulating sleeve 3 and the rotor magnetic steel 11 are injection-molded structures.

[0051] By adopting the above-mentioned technical solution, PPS as an insulating material can be used in two ways: one-piece injection molding and spray molding, which can meet the needs of various production scenarios.

[0052] Furthermore, in order to make the motor have better performance, the material of the first insulating sleeve 15 is alumina ceramic.

[0053] By adopting the above technical solution, the use of alumina ceramics can make the first insulating sleeve 15 have greater rigidity on the basis of insulation, making the rotating shaft 12 more stable during operation and further improving its life. Specifically, the first insulating sleeve 15 can be made of other high-strength insulating materials.

[0054] Furthermore, in order to reduce the volume of the motor, a fan blade 7 is provided on the outer side of the first insulating sleeve 15 .

[0055] The above technical solution is adopted to make the creepage distance between the stator assembly 2 and the fan blade 7 meet the minimum electrical distance. Specifically, the creepage distance L7 between the fan blade 7 and the stator assembly 2 needs to be greater than 4mm, and the creepage distance L2+L3 between the fan blade 7 and the shaft 12 needs to be greater than 4mm, which meets the minimum creepage distance and electrical clearance of high-voltage motor products.

[0056] Furthermore, the creepage distance from the rotating shaft 12 to the casing 13 is L1, the creepage distance from the fan blade 7 to the first bearing 5 is L2+L3, the creepage distance from the fan blade 7 to the rotating shaft 12 is L4, the creepage distance from the casing 13 to the stator assembly 2 is L5+L6, and the creepage distance from the fan blade 7 to the stator assembly 2 is L7. The above L1, L2+L3, L4, L5+L6 and L7 are all greater than 4 mm.

[0057] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A high-voltage brushless outer rotor motor, comprising a rotor assembly and a stator assembly, wherein the rotor assembly comprises a rotor magnet, a rotating shaft, a housing, a sleeve and a first insulating sleeve, wherein the first insulating sleeve is disposed between the housing and the sleeve and fixes the sleeve to the housing, the sleeve is circumferentially fixed to the rotating shaft, and the rotor magnet is mounted on the inner wall of the housing, wherein: The rotor assembly also includes a second insulating sleeve, the rotor magnetic steel sleeve is arranged on the second insulating sleeve, and bosses extending radially outward are respectively arranged at two ends of the outer circumference of the second insulating sleeve, and the rotor magnetic steel is clamped between the two bosses.

2. A high-voltage brushless outer rotor motor according to claim 1, characterized in that: The first insulating sleeve extends axially along the rotating shaft to form a first extending portion, and the first extending portion at least partially overlaps with the second insulating sleeve in the axial direction of the rotating shaft.

3. A high-voltage brushless outer rotor motor according to claim 2, characterized in that: The stator assembly comprises a stator base and a stator forming assembly sleeved on the stator base, and a third insulating sleeve is arranged between the stator base and the stator forming assembly.

4. A high-voltage brushless outer rotor motor according to claim 3, characterized in that: One end of the third insulating sleeve close to the shaft sleeve extends axially along the rotating shaft to form a second extending portion, and the second extending portion at least partially overlaps with the first extending portion in the axial direction of the rotating shaft.

5. A high-voltage brushless outer rotor motor according to claim 3, characterized in that: One end of the third insulating sleeve away from the shaft sleeve extends axially along the rotating shaft to form a third extending portion.

6. A high-voltage brushless outer rotor motor according to claim 2, characterized in that: The rotating shaft sleeve is provided with a first bearing, one end of the first bearing is against the first extension portion, and the other end of the first bearing is positioned with the shoulder of the rotating shaft.

7. A high voltage brushless outer rotor motor according to claim 1, characterized in that: The material of the second insulating sleeve is pps, the second insulating sleeve and the rotor magnetic steel are an integral injection molding structure, or the second insulating sleeve and the rotor magnetic steel are a spray molding structure.

8. A high voltage brushless outer rotor motor according to claim 1, characterized in that: The material of the first insulating sleeve is alumina ceramic.

9. A high-voltage brushless outer rotor motor according to claim 6, characterized in that: A fan blade is arranged on the outer side of the first insulating sleeve.

10. A high voltage brushless outer rotor motor according to claim 9, characterized in that: The creepage distance from the shaft to the casing is greater than 4mm, the creepage distance from the fan blade to the first bearing is greater than 4mm, the creepage distance from the fan blade to the shaft is greater than 4mm, the creepage distance from the casing to the stator assembly is greater than 4mm, and the creepage distance from the fan blade to the stator assembly is greater than 4mm.

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