High-speed motor convenient to assemble and low in noise

Abstract

The utility model discloses a high-speed motor convenient to assemble and low in noise, which comprises a casing, a stator assembly, a rotor assembly, an end cover and a fan blade, the casing comprises an inner casing and an outer casing which are coaxially arranged, the stator assembly is arranged in an accommodating cavity enclosed by the inner casing, a first groove is axially arranged on a contact surface of the inner casing and the stator assembly, and a second groove is arranged on the contact surface of the inner casing and the rotor assembly. The end cover is fixedly connected with the inner shell through a fixing piece, and the fixing piece penetrates through a fixing hole in the end cover to be matched with the first groove and is used for limiting radial rotation of the stator assembly relative to the inner shell; the structure that the fixing piece is matched with the first groove is adopted to replace glue bonding, the two ends of the inner shell are both retracted into the outer shell, a cavity used for containing the movable fan blade and the end cover and a cavity used for containing the end cover are formed in the two ends, and the outgoing line penetrates out of the side wall of the inner shell and the side wall of the outer shell. The utility model has the beneficial effects of space saving, reduction of return air volume, increase of air inlet and outlet efficiency, simple assembly, long service life and low noise during high-speed operation.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a high-speed motor which is easy to assemble and has low noise. Background Art

[0002] A motor generally includes a casing, a stator assembly, a rotor assembly, and a rotating shaft. The rotor assembly rotates relative to the stator assembly via the rotating shaft, and bearings are usually used to reduce rotational friction. Currently, motors generally use glue to bond the stator assembly to the casing, which makes assembly complicated and the glue aging can easily cause operating failures. The traditional stator core uses a nine-slot stator core structure, which produces high electromagnetic noise at a speed of 100,000 to 150,000 rpm. Traditionally, a wire rack assembled with the casing is used to fix the bearings and lead wires, which is cumbersome and complicated to assemble, and the assembly is not tight, the shaft installation concentricity is low, and the moving fan blades and air ducts are made of plastic, which are prone to slight deformation and noise under high-speed operation, and the windward part of the moving fan blades of existing motors will produce relatively large wind noise. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies of the prior art, the utility model provides a high-speed motor that is easy to assemble and has low noise, which solves the technical problems in the prior high-speed motor technology such as complicated process and low production efficiency caused by glue bonding and wire frame assembly, and the nine-slot stator core structure and the existing impeller structure causing high wind noise during high-speed operation of the motor.

[0004] The utility model achieves the above-mentioned purpose through the following technical solutions: a high-speed motor that is easy to assemble and has low noise, including a casing, a stator assembly, a rotor assembly, an end cover, and a fan blade. The casing includes an inner casing and an outer casing that are coaxially arranged, and the stator assembly is placed in a receiving cavity surrounded by the inner casing. A first groove is axially arranged on the contact surface between the inner casing and the stator assembly, and the end cover is fixedly connected to the inner casing by a fixing member. After the fixing member passes through the fixing hole on the end cover, it is fixedly matched with the first groove and a second groove arranged on the outer wall of the stator core of the assembly, so as to limit the radial rotation of the stator assembly relative to the inner casing; both ends of the inner casing are retracted into the outer casing.

[0005] Preferably, the end cover has a first stop portion, which is located at the contact position between the end cover and one end of the inner shell. After the first stop portion is inserted into the inner shell, it is pressed and fixed to one end of the stator core of the stator assembly, and the other end of the stator core is pressed and fixed to the second stop portion arranged on the other end of the inner shell. The stator core is a three-slot stator core structure.

[0006] Preferably, the rotor assembly comprises a rotating shaft, a bearing, a magnetic ring, and a metal ring, and the metal ring is arranged between the rotating shaft and the magnetic ring.

[0007] Preferably, the bearing comprises a first bearing and a second bearing, and the first bearing and the second bearing are respectively arranged at two ends of the magnetic ring.

[0008] Preferably, a second bearing chamber corresponding to the second bearing is arranged inside the end cover; and a first bearing chamber corresponding to the first bearing is arranged inside the inner shell.

[0009] Preferably, an air duct is provided between the inner shell and the outer shell, and guide vanes designed with Archimedean spiral surfaces are arranged in the air duct, and the outer diameter of the guide vanes is 50 mm-69 mm.

[0010] Preferably, a boss is provided at one end of the inner shell close to the fan blade, and the interior of the boss is a bearing chamber.

[0011] Preferably, the fan blade comprises a base and moving blades, the windward portion of the base is a conical inclined surface, and the front end of the windward portion has the smallest area.

[0012] Preferably, the lead wires of the stator assembly pass through the walls of the inner shell and the outer shell and extend out of the motor, and heat dissipation holes are provided at the ends of the end cover and the inner shell.

[0013] Preferably, the first bearing and the second bearing are installed inside the inner shell and the end cover, or the first bearing and the second bearing are installed outside the inner shell and the end cover.

[0014] Compared with the prior art, the beneficial effects obtained by the utility model are:

[0015] The utility model discloses a high-speed motor which is easy to assemble and has low noise, comprising a casing, a stator assembly, a rotor assembly, an end cover, and a fan blade. The casing comprises an inner casing and an outer casing which are coaxially arranged. The stator assembly is placed in a receiving cavity surrounded by the inner casing. A first groove is axially arranged on a contact surface between the inner casing and the stator assembly. The end cover is fixedly connected to the inner casing by a fixing member. The fixing member passes through a fixing hole on the end cover and is fixedly matched with the first groove and a second groove arranged on an outer wall of a stator core of the stator assembly, so as to limit the radial rotation of the stator assembly relative to the inner casing. ; A structure in which a fixing piece cooperates with the first groove is used instead of glue bonding, which solves the technical problem that the original motor assembly is complicated and the glue is prone to operating failure due to aging; both ends of the inner shell are retracted into the outer shell, and both ends form cavities for accommodating the moving fan blades and end covers, and the lead wires pass through the side walls of the inner shell and the outer shell, which solves the technical problem of low installation concentricity and high noise caused by the original wire rack installation; it has the advantages of saving space, reducing the axial length of the motor, saving installation space during application, reducing the return air volume, increasing the efficiency of air intake and air outlet, simple assembly, long service life, and low noise during high-speed operation;

[0016] The stator assembly is fixed by the stopper position of the end cover and the inner shell, which solves the problem of traditional motors directly locking screws with the stator plane, causing the vibration and noise caused by the inclination of the shaft centerline due to the flatness deviation of the stator core. At the same time, it further ensures the concentricity of the motor assembly, and the performance is more stable at high speeds (100,000 rpm) or above;

[0017] The air duct formed between the inner shell and the outer shell is provided with a guide blade, and the guide blade adopts an Archimedean spiral design to form an air guide groove, and the air guide groove is integrated with the housing to increase the air outlet area, improve the air outlet efficiency, reduce the wind noise of the motor, and save energy;

[0018] The base of the fan blade is set as a conical slope in the windward direction to ensure the air intake efficiency of the fan and greatly reduce wind noise;

[0019] A boss is arranged at the end of the inner shell near the fan blade, and the inside of the boss is a bearing chamber for installing the bearing, so that the torque of the fan during operation is closer to the bearing end, reducing the torque borne by the bearing and further reducing the vibration noise of the motor operation;

[0020] After the end cover and the inner shell are fixedly assembled, the position of the stator assembly is fixed. Heat dissipation holes are arranged at the ends of the end cover and the inner shell to reduce the working temperature of the stator assembly, which has the beneficial effect of extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0022] Figure 1 The utility model is a schematic diagram of a high-speed motor which is easy to assemble and has low noise.

[0023] Figure 2 The utility model shows a cross-sectional view of a high-speed motor which is easy to assemble and has low noise.

[0024] Figure 3 The utility model is a schematic diagram showing a casing of a high-speed motor which is easy to assemble and has low noise.

[0025] Figure 4 The utility model is a schematic diagram of a stator assembly of a high-speed motor which is easy to assemble and has low noise.

[0026] Figure 5 The utility model shows a schematic diagram of an end cover and a fixing part of a high-speed motor which is easy to assemble and has low noise.

[0027] Figure markings: 1-casing; 11-inner casing; 111-first groove; 112-second stop portion; 113-first bearing chamber; 114-boss; 12-outer casing; 2-stator assembly; 21-stator core; 211-second groove; 22-lead wire; 3-rotor assembly; 31-rotating shaft; 32-bearing; 321-first bearing; 322-second bearing; 33-magnetic ring; 34-metal ring; 4-end cover; 41-fixing hole; 42-first stop portion; 43-second bearing chamber; 5-fan blade; 51-base; 52-moving blade; 6-fixing part; 7-guide vane; 8-heat dissipation hole. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the drawings and specific embodiments of the specification, but the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] Please see attached Figure 1 To Attachment Figure 5A high-speed motor that is easy to assemble and has low noise, comprising a housing 1, a stator assembly 2, a rotor assembly 3, an end cover 4, and a fan blade 5. The housing 1, the end cover 4, and the fan blade 5 are made of aluminum alloy, zinc alloy, or other metals; the housing 1 comprises an inner housing 11 and an outer housing 12 that are coaxially arranged, and an air duct is provided between the inner housing 11 and the outer housing 12. The air duct is provided with guide blades 7 designed with an Archimedean spiral surface, and the number of the guide blades 7 is an odd number, and the specific use is There are nine guide blades, and the outer diameter of the guide blade 7 is 50 mm. The outer diameter of the fan blade is less than 50 mm, the wind pressure and air volume are small, and the user experience is poor. Both ends of the inner shell 11 are retracted into the outer shell 12 to form a cavity for installing the fan blade 5 and the end cover 4. A boss 114 is provided at one end of the inner shell 11 close to the fan blade 5; the fan blade 5 has a base 51 and a moving blade 52, and the windward part of the base 51 is a conical inclined surface, and the area of ​​the front end of the windward part is the smallest.

[0031] The stator assembly 2 is placed in the accommodating cavity surrounded by the inner shell 11. The contact surface between the inner shell 11 and the stator assembly 2 is provided with three first grooves 111 along the axial direction. The end cover 4 is fixedly connected to the inner shell 11 through a fixing member 6. The fixing member 6 passes through the fixing hole 41 on the end cover 4 and is fixedly matched with the first groove 111 and a second groove 211 provided on the outer wall of the stator core 21 of the assembly 2. The first groove 111 and the second groove 211 surround the fixing member 6 to limit the radial rotation of the stator assembly 2 relative to the inner shell 11. The fixing member 6 is a long screw.

[0032] The rotor assembly 3 includes a rotating shaft 31, a bearing 32, a magnetic ring 33, and a metal ring 34. The metal ring 34 is arranged between the rotating shaft 31 and the magnetic ring 33. The bearing 32 includes a first bearing 321 and a second bearing 322. The first bearing 321 and the second bearing 322 are arranged at two ends of the magnetic ring 33 respectively. A second bearing chamber 43 corresponding to the second bearing 322 is arranged inside the end cover 4; a first bearing chamber 113 corresponding to the first bearing 321 is arranged inside the boss 114.

[0033] Furthermore, the end cover 4 has a first stop portion 42, which is located at the contact position between the end cover 4 and one end of the inner shell 11. After the first stop portion 42 is inserted into the inner shell 11, it is pressed and fixed to one end of the stator core 21 of the stator assembly 2, and the other end of the stator core 21 is pressed and fixed to the second stop portion 112 arranged on the other end of the inner shell 11. The stator core 21 is a three-slot stator core structure.

[0034] Furthermore, the lead wire 22 of the stator assembly 2 passes through the walls of the inner shell 11 and the outer shell 12 and extends out of the motor, and the end of the end cover 4 and the end of the inner shell 11 are both provided with heat dissipation holes 8.

[0035] Example 2

[0036] Please see attached Figure 1 To Attachment Figure 5 A high-speed motor that is easy to assemble and has low noise, comprising a housing 1, a stator assembly 2, a rotor assembly 3, an end cover 4, and a fan blade 5. The housing 1, the end cover 4, and the fan blade 5 are made of aluminum alloy, zinc alloy, or other metals; the housing 1 comprises an inner housing 11 and an outer housing 12 that are coaxially arranged, and an air duct is provided between the inner housing 11 and the outer housing 12. The air duct is provided with guide blades 7 designed with an Archimedean spiral surface, and the number of the guide blades 7 is an odd number, specifically 1 1 guide blade, the outer diameter of the guide blade 7 is 69 mm, the outer diameter of the fan blade is greater than 69 mm, the vibration and noise are increased, and the user experience is poor, the two ends of the inner shell 11 are retracted into the outer shell 12 to form a cavity for installing the fan blade 5 and the end cover 4, and a boss 114 is provided at one end of the inner shell 11 close to the fan blade 5; the fan blade 5 has a base 51 and a moving blade 52, the windward part of the base 51 is a conical inclined surface, and the area of ​​the front end of the windward part is the smallest.

[0037] The stator assembly 2 is placed in the accommodating cavity surrounded by the inner shell 11. The contact surface between the inner shell 11 and the stator assembly 2 is provided with three first grooves 111 along the axial direction. The end cover 4 is fixedly connected to the inner shell 11 through a fixing member 6. The fixing member 6 passes through the fixing hole 41 on the end cover 4 and is fixedly matched with the first groove 111 and a second groove 211 provided on the outer wall of the stator core 21 of the assembly 2. The first groove 111 and the second groove 211 surround the fixing member 6 to limit the radial rotation of the stator assembly 2 relative to the inner shell 11. The fixing member 6 is a long screw.

[0038] The rotor assembly 3 includes a rotating shaft 31, a bearing 32, a magnetic ring 33, and a metal ring 34. The metal ring 34 is arranged between the rotating shaft 31 and the magnetic ring 33. The bearing 32 includes a first bearing 321 and a second bearing 322. The first bearing 321 and the second bearing 322 are arranged at two ends of the magnetic ring 33 respectively. A second bearing chamber 43 corresponding to the second bearing 322 is arranged inside the end cover 4; a first bearing chamber 113 corresponding to the first bearing 321 is arranged inside the boss 114.

[0039] Furthermore, the end cover 4 has a first stop portion 42, which is located at the contact position between the end cover 4 and one end of the inner shell 11. After the first stop portion 42 is inserted into the inner shell 11, it is pressed and fixed to one end of the stator core 21 of the stator assembly 2, and the other end of the stator core 21 is pressed and fixed to the second stop portion 112 arranged on the other end of the inner shell 11. The stator core 21 has a three-slot stator core structure and an inner rotor design. At high speeds (30,000 to 100,000 rpm), the rotor runs more smoothly, effectively avoiding the gyroscopic effect generated by the outer rotor and reducing the motor's reaction force.

[0040] Furthermore, the lead wire 22 of the stator assembly 2 passes through the walls of the inner shell 11 and the outer shell 12 and extends out of the motor, and the end of the end cover 4 and the end of the inner shell 11 are both provided with heat dissipation holes 8.

[0041] The above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and many similar modifications are possible, such as adopting an external bearing design, that is, the first bearing and the second bearing are installed on the outside of the inner shell 11 and the end cover 4. All modifications that can be directly derived or associated with the content disclosed by ordinary technicians in this field should be considered to be within the scope of protection of the present invention.

Claims

1. A high-speed motor that is easy to assemble and has low noise, characterized in that: The invention comprises a casing (1), a stator assembly (2), a rotor assembly (3), an end cover (4), and a fan blade (5). The casing (1) comprises an inner casing (11) and an outer casing (12) which are coaxially arranged. The stator assembly (2) is placed in a receiving cavity surrounded by the inner casing (11). A first groove (111) is axially arranged on a contact surface between the inner casing (11) and the stator assembly (2). The end cover (4) is fixedly connected to the inner casing (11) via a fixing member (6). The fixing member (6) passes through a fixing hole (41) on the end cover (4) and is fixedly matched with the first groove (111) and a second groove (211) arranged on the outer wall of a stator core (21) of the assembly (2) to limit radial rotation of the stator assembly (2) relative to the inner casing (11). Both ends of the inner casing (11) are retracted into the outer casing (12).

2. The easy-to-assemble and low-noise high-speed motor according to claim 1, characterized in that: The end cover (4) has a first stop portion (42), the first stop portion (42) is located at the contact position between the end cover (4) and one end of the inner shell (11), and after the first stop portion (42) is inserted into the inner shell (11), it is pressed and fixed to one end of the stator core (21) of the stator assembly (2), and the other end of the stator core (21) is pressed and fixed to a second stop portion (112) provided on the other end of the inner shell (11), and the stator core (21) is a three-slot stator core structure.

3. The easy-to-assemble and low-noise high-speed motor according to claim 1, characterized in that: The rotor assembly (3) comprises a rotating shaft (31), a bearing (32), a magnetic ring (33), and a metal ring (34), wherein the metal ring (34) is arranged between the rotating shaft (31) and the magnetic ring (33).

4. The easy-to-assemble and low-noise high-speed motor according to claim 3, characterized in that: The bearing (32) comprises a first bearing (321) and a second bearing (322), wherein the first bearing (321) and the second bearing (322) are respectively arranged at two ends of the magnetic ring (33).

5. The easy-to-assemble and low-noise high-speed motor according to claim 4, characterized in that: A second bearing chamber (43) corresponding to the second bearing (322) is provided inside the end cover (4); and a first bearing chamber (113) corresponding to the first bearing (321) is provided inside the inner shell (11).

6. The easy-to-assemble and low-noise high-speed motor according to claim 1, characterized in that: An air duct is provided between the inner shell (11) and the outer shell (12), and a guide vane (7) having an Archimedean spiral curved surface is arranged in the air duct, wherein the outer diameter of the guide vane (7) is 50 mm-69 mm.

7. The easy-to-assemble and low-noise high-speed motor according to claim 1, characterized in that: A boss (114) is provided at one end of the inner shell (11) close to the fan blade (5), and the interior of the boss (114) is a bearing chamber.

8. The easy-to-assemble and low-noise high-speed motor according to claim 1, characterized in that: The fan blade (5) comprises a base (51) and a moving blade (52); the windward portion of the base (51) is a conical inclined surface, and the front end of the windward portion has the smallest area.

9. The easy-to-assemble and low-noise high-speed motor according to claim 1, characterized in that: The lead wire (22) of the stator assembly (2) passes through the walls of the inner shell (11) and the outer shell (12) and extends out of the motor. The end portions of the end cover (4) and the inner shell (11) are both provided with heat dissipation holes (8).

10. The easy-to-assemble and low-noise high-speed motor according to claim 4, characterized in that: The first bearing and the second bearing are mounted inside the inner shell (11) and the end cover (4), or the first bearing and the second bearing are mounted outside the inner shell (11) and the end cover (4).

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