Motor, fan and electrical equipment

Abstract

The utility model discloses a motor, fan and electrical equipment, and relates to the technical field of motors, the motor comprises a stator assembly, a rotor assembly, a first pre-tightening piece and a second pre-tightening piece, the stator assembly comprises a bearing seat, the bearing seat is provided with two bearing chambers, and the bearing chambers are arranged in the bearing seat. A first abutting face and a second abutting face are formed on the sides, close to each other or away from each other, of the two bearing chambers respectively, the rotor assembly comprises a rotating shaft, a first bearing, a second bearing and a third bearing, the first bearing is located in one bearing chamber, and the second bearing and the third bearing are located in the other bearing chamber. The first pre-tightening piece is arranged between the first bearing and the first abutting face, the second pre-tightening piece abuts against the side, away from the second abutting face, of the second bearing, and the third bearing abuts against the side, away from the second bearing, of the second pre-tightening piece. According to the motor, the fan and the electrical equipment, the axial force borne by the bearing of the motor can be reduced, the service life of the bearing is further prolonged, and the reliability of the motor is better.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a motor, a fan and electrical equipment. Background Art

[0002] The rotating shaft of some motors is installed between two bearings, and a preload is abutted on one side of one of the bearings. The preload provides preload force to the bearing and provides preload force to the other bearing through the rotating shaft. Under different usage environments, such as when the air outlet direction of the fan is different, the extension direction of the rotating shaft of the fan motor may be different, which will cause a large change in the force on the bearing. Taking the vertical extension of the rotating shaft as an example, in order to avoid compression of the preload when it is subjected to the overall gravity of the rotor assembly and the load, the preload force applied to the bearing by the preload needs to be greater than the overall gravity of the rotor assembly and the load. In this way, when the motor is installed in reverse, the bearing away from the preload will not only bear the overall gravity of the rotor assembly and the load, but also the preload applied by the preload. The axial force on the bearing is too large, which will reduce the service life of the bearing and poor motor reliability. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a motor that can reduce the axial force on the bearing, thereby increasing the service life of the bearing and improving the reliability of the motor.

[0004] The utility model also provides a fan with the motor.

[0005] The utility model also provides an electrical device with the fan.

[0006] According to an embodiment of the first aspect of the utility model, the motor comprises a stator assembly, a rotor assembly, a first preload member and a second preload member, the stator assembly comprises a bearing seat, the bearing seat is provided with two bearing chambers, the sides of the two bearing chambers close to each other are respectively formed with a first abutting surface and a second abutting surface, or the sides of the two bearing chambers far away from each other are respectively formed with a first abutting surface and a second abutting surface, the rotor assembly comprises a rotating shaft, a first bearing, a second bearing and a third bearing, the first bearing, the second bearing and the third bearing are respectively sleeved on the outside of the rotating shaft, the first bearing is located in one of the bearing chambers, the second bearing and the third bearing are located in the other bearing chamber, the first preload member is arranged between the first bearing and the first abutting surface to provide a preload force to the first bearing in a direction away from the first abutting surface, the second preload member abuts against the side of the second bearing away from the second abutting surface to provide a preload force to the second bearing in a direction toward the second abutting surface, and the third bearing abuts against the side of the second preload member away from the second bearing.

[0007] The motor according to the embodiment of the utility model has at least the following beneficial effects:

[0008] Taking the example of a rotating shaft extending vertically and forming a first abutment surface and a second abutment surface on the side where two bearing chambers are close to each other, according to the force balance condition, the axial force borne by the first bearing is equal to the preload force provided by the first preload member. Since the second bearing is provided with a second preload member on the side away from the second abutment surface, the axial force borne by the second bearing is equal to the difference between the force applied by the second abutment surface and the preload force provided by the second preload member. When the first bearing is located at the top end of the rotating shaft, the force applied to the second bearing by the second abutment surface is roughly equal to the preload force provided by the first preload member minus the overall gravity of the rotor assembly and the load. In this case, the axial force borne by the second bearing is smaller. When the first bearing is located at the bottom end of the rotating shaft, the force applied to the second bearing by the second abutment surface is roughly equal to the preload force provided by the first preload member plus the overall gravity of the rotor assembly and the load. In this case, the axial force borne by the second bearing becomes larger. However, since the preload force provided by the second preload member can partially offset the force applied by the second abutment surface, the axial force borne by the second bearing is still much smaller than the axial force borne in the prior art, thereby increasing the service life of the bearing and improving the reliability of the motor.

[0009] According to some embodiments of the present invention, the rotor assembly further includes a first stopper, which is located between the second bearing and the third bearing and abuts against the inner ring of the second bearing and the inner ring of the third bearing respectively.

[0010] According to some embodiments of the present utility model, the first limit member is configured as an annular structure, the first limit member is sleeved on the outside of the rotating shaft, and the second pre-tightening member is located on a side of the first limit member away from the rotating shaft.

[0011] According to some embodiments of the present invention, the stator assembly further includes a stator, which is disposed on the bearing seat; the rotor assembly further includes a rotor, which is connected to the rotating shaft and is sleeved on the outer side of the stator.

[0012] According to some embodiments of the present invention, the rotor assembly further includes a connecting sleeve, which is sleeved on the outer side of the rotating shaft, the connecting sleeve is located on the side of the third bearing away from the second bearing, and the rotor is connected to the connecting sleeve.

[0013] According to some embodiments of the present invention, the rotor assembly also includes a second limit member, which is connected to the rotating shaft and abuts against a side of the first bearing away from the first preload member to limit the movement of the first bearing in a direction away from the first preload member.

[0014] According to some embodiments of the present utility model, the second position limiting member is configured as an annular structure, the outer side wall of the rotating shaft is provided with an annular groove extending along the circumference of the rotating shaft, and the second position limiting member is installed in the annular groove.

[0015] According to some embodiments of the present invention, the first pre-tightening member and / or the second pre-tightening member is configured as a corrugated gasket, and the corrugated gasket is sleeved on the outer side of the rotating shaft.

[0016] According to some embodiments of the utility model, the inner ring of the first bearing and the inner ring of the second bearing are respectively interference fit with the rotating shaft, the outer ring of the first bearing and the outer ring of the second bearing are respectively clearance fit with the corresponding inner circumferential wall of the bearing chamber, the first preload member abuts against the outer ring of the first bearing, and the second preload member abuts against the outer ring of the second bearing.

[0017] The fan according to the second embodiment of the utility model includes the motor described in the first embodiment.

[0018] The fan according to the embodiment of the utility model has at least the following beneficial effects:

[0019] By adopting the motor of the first aspect embodiment of the utility model, a second preload member is provided on the side of the second bearing facing away from the second abutment surface. The preload force provided by the second preload member can partially offset the force applied by the second abutment surface, thereby greatly reducing the axial force on the second bearing, thereby significantly improving the service life of the bearing and improving the reliability of the motor.

[0020] The electrical equipment according to the embodiment of the third aspect of the utility model includes the fan described in the embodiment of the second aspect.

[0021] The electrical equipment according to the embodiment of the utility model has at least the following beneficial effects:

[0022] By adopting the fan described in the embodiment of the second aspect of the utility model, the motor of the fan is provided with a second preload member on the side of the second bearing facing away from the second abutment surface. The preload force provided by the second preload member can partially offset the force applied by the second abutment surface, thereby greatly reducing the axial force on the second bearing, thereby significantly improving the service life of the bearing and improving the reliability of the motor.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 This is a schematic diagram of the structure of a motor according to an embodiment of the utility model;

[0026] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0027] Figure 3 for Figure 1 The enlarged view of point B in the middle;

[0028] Figure 4 for Figure 1 Schematic diagram of the force analysis of the middle part structure;

[0029] Figure 5 for Figure 1 Schematic diagram of the motor when it is installed in reverse;

[0030] Figure 6 for Figure 5 Schematic diagram of the force analysis of the middle part structure;

[0031] Figure 7 for Figure 5 Schematic diagram of the partial structure of the rotating shaft.

[0032] Figure Number:

[0033] Stator assembly 100; bearing seat 101; bearing chamber 102; first abutting surface 103; second abutting surface 104; stator 105;

[0034] Rotor assembly 200; rotating shaft 201; first bearing 202; second bearing 203; third bearing 204; first stopper 205; connecting sleeve 206; rotor 207; second stopper 208; annular groove 209;

[0035] A first preload member 300;

[0036] The second pre-tensioning member 400 . DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In the description of the present utility model, "a plurality" refers to two or more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. 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.

[0041] The motor generally includes a stator assembly and a rotor assembly. Taking the outer rotor motor of a fan as an example, the stator assembly includes a bearing seat, the bearing seat is provided with two bearing chambers, and the sides of the two bearing chambers close to each other form a first abutment surface and a second abutment surface respectively. The rotor assembly includes a rotating shaft, a first bearing, a second bearing and a rotor. The first bearing and the second bearing are both sleeved outside the rotating shaft and are respectively located in the two bearing chambers. A preload such as a corrugated gasket is clamped between the first bearing and the first abutment surface. The second bearing abuts the second abutment surface. The preload provides a preload force to the first bearing abutted therewith, and provides a preload force to the second bearing through the rotating shaft.

[0042] In different usage environments, the extension direction of the shaft may be different. For example, in order to improve the adaptability of the fan to the installation environment of the client, the fan needs to be able to meet the needs of multiple air outlet directions such as horizontal air outlet to the left, horizontal air outlet to the right, vertical air outlet upward, and vertical air outlet downward. Therefore, the motor may have multiple installation directions, which requires the motor shaft to extend in different directions, resulting in a large change in the force on the bearing.

[0043] Taking the case where the shaft extends vertically as an example, when the first bearing is located at the top of the shaft, the preload is clamped between the bottom side of the first bearing and the first abutment surface, and the preload bears the overall gravity of the rotor assembly and the load. In order to avoid compression or movement of the preload and keep the preload in a stable working state, the preload applied by the preload to the first bearing, that is, the axial force on the first bearing needs to be greater than the overall gravity of the rotor assembly and the load. Correspondingly, the force applied by the second abutment surface to the second bearing, that is, the axial force on the second bearing is equal to the preload applied by the preload minus the overall gravity of the rotor assembly and the load. In this case, the axial force on the second bearing is smaller. When the motor is reversely installed so that the first bearing is located at the bottom of the shaft, the axial force on the first bearing is still equal to the preload applied by the preload, but according to the force balance condition, the axial force on the second bearing, in addition to the overall gravity of the rotor assembly and the load, will also bear the preload applied by the preload, which will lead to a significant increase in the axial force on the second bearing, thereby reducing the service life of the bearing and resulting in poor motor reliability.

[0044] To this end, the utility model proposes a motor, a fan and an electrical device, which can effectively improve the above-mentioned problems.

[0045] Reference below Figures 1 to 7 The present invention describes a motor, a fan and an electrical device according to the embodiments of the present invention.

[0046] According to the motor of the first embodiment of the utility model, Figures 1 to 7 As shown, the stator assembly 100 , the rotor assembly 200 , the first pre-tightening member 300 and the second pre-tightening member 400 are included.

[0047] The stator assembly 100 includes a bearing seat 101, and the bearing seat 101 is provided with two bearing chambers 102. The two bearing chambers 102 are arranged along the axial direction of the rotating shaft 201 of the rotor assembly 200. The bearing chambers 102 are used to install bearings. The first abutting surface 103 and the second abutting surface 104 may be formed on the side where the two bearing chambers 102 are close to each other, that is, the first abutting surface 103 is formed on the side where the first bearing chamber 102 is close to the second bearing chamber 102, and the second abutting surface 104 is formed on the side where the second bearing chamber 102 is close to the first bearing chamber 102. This situation is applicable to outer rotor motors. In addition, the first abutting surface 103 and the second abutting surface 104 may be formed on the side where the two bearing chambers 102 are far away from each other, that is, the first abutting surface 103 is formed on the side where the first bearing chamber 102 is far away from the second bearing chamber 102, and the second abutting surface 104 is formed on the side where the second bearing chamber 102 is far away from the first bearing chamber 102. This situation is applicable to inner rotor motors.

[0048] The rotor assembly 200 includes a rotating shaft 201, a first bearing 202, a second bearing 203 and a third bearing 204. The first bearing 202, the second bearing 203 and the third bearing 204 are all sleeved outside the rotating shaft 201. The inner ring of the first bearing 202, the inner ring of the second bearing 203 and the inner ring of the third bearing 204 can be interference fit with the rotating shaft 201. The first bearing 202 is located in one of the bearing chambers 102, and the second bearing 203 and the third bearing 204 are located in the other bearing chamber 102. Specifically, the first bearing 202 is located in a first abutment surface 103 formed thereon. In the bearing chamber 102, the outer ring of the first bearing 202 can be loosely matched with the inner circumferential wall of the corresponding bearing chamber 102, the second bearing 203 and the third bearing 204 are located in the bearing chamber 102 formed with the second abutting surface 104, the outer rings of the second bearing 203 and the third bearing 204 can be loosely matched with the inner circumferential wall of the corresponding bearing chamber 102, the side of the second bearing 203 close to the second abutting surface 104 abuts against the second abutting surface 104 to achieve the positioning of the second bearing 203, and the third bearing 204 is located on the side of the second bearing 203 that is away from the second abutting surface 104.

[0049] The first preload member 300 is clamped between the first bearing 202 and the first abutting surface 103. Specifically, the first preload member 300 can be clamped between the first abutting surface 103 and the outer ring of the first bearing 202. The first preload member 300 can be a corrugated gasket, a disc spring or other suitable preload structure that can provide a preload force. The first preload member 300 provides a preload force to the first bearing 202 in a direction away from the first abutting surface 103, which can reduce the gap between the inner ring and the outer ring of the first bearing 202, so that the rolling elements maintain a closer contact with the inner ring and the outer ring, thereby reducing noise and improving stiffness and transmission accuracy.

[0050] The second preload member 400 abuts against the side of the second bearing 203 that is away from the second abutting surface 104. Specifically, the second preload member 400 can abut against the side of the outer ring of the second bearing 203 that is away from the second abutting surface 104. The second preload member 400 can be a wave washer, a disc spring or other suitable preload structure that can provide a preload force. The second preload member 400 provides a preload force to the second bearing 203 in the direction toward the second abutting surface 104, which can reduce the gap between the inner ring and the outer ring of the second bearing 203, so that the rolling element maintains a closer contact with the inner ring and the outer ring, thereby reducing noise and improving rigidity and transmission accuracy. The third bearing 204 can abut against the side of the outer ring of the second bearing 203 that is away from the second preload member 400, so as to realize the positioning of the second preload member 400.

[0051] The stator assembly 100 may further include a stator 105, and the rotor assembly 200 may further include a rotor 207, wherein the rotor 207 is connected to the rotating shaft 201. When the motor is an outer rotor motor, the rotor 207 surrounds the outer side of the stator 105 of the stator assembly 100, and the rotor 207 can be connected to an external load. When the motor is an inner rotor motor, the stator 105 of the stator assembly 100 surrounds the outside of the rotor 207, and the rotating shaft 201 can be connected to an external load.

[0052] Taking the example that the rotating shaft 201 extends vertically and the adjacent sides of the two bearing chambers 102 form the first abutting surface 103 and the second abutting surface 104 respectively, the force conditions of the first bearing 202, the second bearing 203 and the third bearing 204 are analyzed.

[0053] like Figure 1 and Figure 4 As shown, when the first bearing 202 is located at the top end of the rotating shaft 201 and the second bearing 203 is located at the bottom end of the rotating shaft 201:

[0054] The first preload member 300 is clamped between the bottom side of the first bearing 202 and the first abutting surface 103 below. The rotor assembly 200 and the external load are both borne on the first preload member 300. In order to avoid compression or movement of the first preload member 300 and keep the first preload member 300 in a stable working state, the upward preload force F1 applied by the first preload member 300 to the first bearing 202 needs to be greater than the overall gravity G of the rotor assembly 200 and the load, that is:

[0055] F1>G,

[0056] The first bearing 202 is subjected to an axial force F a1 is equal to the preload force F1 applied by the first preload member 300 to the first bearing 202, therefore:

[0057] F a1 =F1>G,

[0058] The top side of the second bearing 203 abuts against the second abutting surface 104 above it, and the second preload member 400 abuts against the bottom side of the second bearing 203. According to the force balance condition, the downward force F2 applied by the second abutting surface 104 to the second bearing 203 is equal to the preload force F1 applied by the first preload member 300 minus the overall gravity G of the rotor assembly 200 and the load, that is:

[0059] F2=F1-G,

[0060] The upward preload force applied by the second preload member 400 to the second bearing 203 is F3, and the axial force F a2 is equal to the force F2 applied by the second abutting surface 104 minus the preload force F3 applied by the second preload member 400, that is:

[0061] F a2 =F2-F3=F1-G-F3,

[0062] The axial force applied to the third bearing 204 is equal to the downward preload force applied to the third bearing 204 by the second preload member 400 , and the value is equal to F3 .

[0063] As can be seen from the above, in this case, the axial force F on the second bearing 203 is a2 Smaller.

[0064] like Figure 5 and Figure 6 As shown, when the motor is installed in reverse, so that the first bearing 202 is located at the bottom end of the rotating shaft 201 and the second bearing 203 is located at the top end of the rotating shaft 201:

[0065] The first preload member 300 is clamped between the top side of the first bearing 202 and the first abutting surface 103 above. The first bearing 202 is subjected to an axial force F a1 It is still equal to the preload force F1 applied by the first preload member 300 to the first bearing 202, that is:

[0066] F a1 =F1>G,

[0067] The bottom side of the second bearing 203 abuts against the second abutting surface 104 below it, and the second preload member 400 abuts against the top side of the second bearing 203. According to the force balance condition, the upward force F2 applied by the second abutting surface 104 to the second bearing 203 is equal to the preload force F1 applied by the first preload member 300 plus the overall gravity G of the rotor assembly 200 and the load, that is:

[0068] F2=F1+G,

[0069] The downward preload force applied by the second preload member 400 to the second bearing 203 is F3, and the axial force F a2 is equal to the force F2 applied by the second abutting surface 104 minus the preload force F3 applied by the second preload member 400, that is:

[0070] F a2 =F2-F3=F1+G-F3,

[0071] The axial force applied to the third bearing 204 is equal to the upward preload force applied to the third bearing 204 by the second preload member 400 , and the value is equal to F3 .

[0072] As can be seen from the above, in this case, the axial force F on the second bearing 203 is a2However, since the preload force provided by the second preload member 400 can partially offset the force applied to the second bearing 203 by the second abutment surface 104, the axial force received by the second bearing 203 is still much smaller than the axial force received in the prior art, thereby reducing damage to the bearing, significantly improving the service life of the bearing, and improving the reliability of the motor.

[0073] In addition, the third bearing 204 is provided, so that the installation of the rotating shaft 201 can be more stable, the rotation of the rotating shaft 201 is more stable, and the installation structure strength of the rotating shaft 201 is higher. For example, when the motor is an outer rotor motor, the rotor 207 of the rotor assembly 200 can be connected to the end of the rotating shaft 201 close to the third bearing 204, thereby reducing the shaking and damage of the rotating shaft 201, making the motor run more smoothly, with less noise and longer service life. Secondly, the closer to the connection position between the rotor 207 and the rotating shaft 201, the greater the radial force that the bearing needs to bear. In this embodiment, two bearings are provided near the connection position between the rotor 207 and the rotating shaft 201. The two bearings can share a larger radial force, thereby reducing the radial force received by a single bearing, thereby increasing the service life of the bearing and the motor. In addition, the third bearing 204 can also cooperate with the second bearing 203 to position the second preload 400, so as to prevent the second preload 400 from moving at will, so that the second preload 400 can stably provide a preload effect to the second bearing 203.

[0074] refer to Figure 3 As shown, in a further embodiment of the utility model, the motor also includes a first limit member 205, which is located between the second bearing 203 and the third bearing 204, and abuts against the side where the second bearing 203 and the third bearing 204 are close to each other. For example, the first limit member 205 can abut against the side where the inner ring of the second bearing 203 and the inner ring of the third bearing 204 are close to each other.

[0075] In this embodiment, through the limiting effect of the first limiting member 205, when the interference between the inner ring of the second bearing 203 and the rotating shaft 201 is small, or the interference between the inner ring of the third bearing 204 and the rotating shaft 201 is small, resulting in failure of the interference connection, the second bearing 203 and the third bearing 204 can be limited to avoid the second bearing 203 and the third bearing 204 approaching each other and compressing the second preload member 400, thereby not only making the preload force of the second preload member 400 within an appropriate range, but also making the second preload member 400 in a preset position, thereby making the preload effect of the second preload member 400 better, thereby further ensuring the reliability of the motor.

[0076] refer to Figure 3As shown, in a further embodiment of the present invention, the first limiter 205 is configured as an annular structure, the first limiter 205 is sleeved on the outside of the rotating shaft 201 , and the second preload member 400 is located on the side of the first limiter 205 away from the rotating shaft 201 .

[0077] In this embodiment, the first stopper 205 is set as an annular structure. When the first stopper 205 needs to be installed, the first stopper 205 can be sleeved outside the rotating shaft 201. The installation and disassembly are more convenient and the installation is more stable. Moreover, the first stopper 205 abuts against the second bearing 203 and the third bearing 204 along the circumferential direction, so that the first stopper 205 has a better limiting effect. In addition, when the rotating shaft 201 rotates, the force on the rotating shaft 201 is more uniform, the shaking of the rotating shaft 201 is smaller, and the noise is less. The second preload member 400 is located on the side of the first stopper 205 away from the rotating shaft 201. For example, the second preload member 400 can be set as an annular structure and sleeved outside the first stopper 205. Such a configuration can avoid the second preload member 400 from interfering with the first stopper 205 and reducing the preload effect of the second preload member 400 and the limiting effect of the first stopper 205.

[0078] It should be noted that, in some other embodiments of the present invention, the first position-limiting member 205 may also be other suitable structures, for example, a block structure, which will not be described in detail here.

[0079] refer to Figure 1 and Figure 5 As shown, in a further embodiment of the present invention, the stator assembly 100 further includes a stator 105, which is disposed on the bearing seat 101, and the rotor assembly 200 further includes a rotor 207, which is connected to the rotating shaft 201 and sleeved on the outside of the stator 105. In this embodiment, the motor is an outer rotor motor, which is not only compact in structure and can save installation space, but also more convenient to assemble, and runs more smoothly, and finally has a wide range of applications, especially suitable for fans.

[0080] refer to Figure 1 and Figure 5 As shown, in a further embodiment of the present utility model, the rotor assembly 200 further includes a connecting sleeve 206, which is sleeved outside the rotating shaft 201, and is located on the side of the third bearing 204 away from the second bearing 203, and the rotor 207 is connected to the connecting sleeve 206. For example, the connecting sleeve 206 can be interference fit with the rotating shaft 201 or connected by a key or welded, and the rotor 207 can be welded to the connecting sleeve 206, connected by a fastener, or clamped, etc.

[0081] In this embodiment, the connecting sleeve 206 is located on the side of the third bearing 204 away from the second bearing 203, and the rotor 207 is connected to the connecting sleeve 206, so that the second bearing 203 and the third bearing 204 can share the radial force generated by the rotor 207 and the load, thereby reducing the radial force on a single bearing, thereby increasing the service life of the bearing and the motor. In addition, the rotating shaft 201 is subjected to greater force and greater vibration near the connection position between it and the rotor 207, which is prone to noise and damage. In this embodiment, the connection position between the rotating shaft 201 and the rotor 207 is close to the second bearing 203 and the third bearing 204, thereby reducing the vibration and damage of the rotating shaft 201, making the motor run more smoothly, with less noise and a longer service life.

[0082] It should be noted that the connecting sleeve 206 can abut the inner ring of the third bearing 204 to axially limit the third bearing 204. Of course, when the inner ring of the third bearing 204 is interference fit with the rotating shaft 201, the connecting sleeve 206 may not abut the inner ring of the third bearing 204.

[0083] refer to Figure 2 As shown, in some embodiments of the utility model, the motor also includes a second limit member 208, the second limit member 208 is connected to the rotating shaft 201, and the second limit member 208 abuts against the side of the first bearing 202 that is away from the first preload member 300. For example, the second limit member 208 can be clamped, welded or connected to the rotating shaft 201 by other suitable means, and the second limit member 208 can abut against the side of the inner ring of the first bearing 202 that is away from the first preload member 300.

[0084] In this embodiment, through the limiting effect of the second limiting member 208, when the interference between the inner ring of the first bearing 202 and the rotating shaft 201 is small, resulting in failure of the interference connection, the first bearing 202 can be limited to prevent the first bearing 202 from moving relative to the rotating shaft 201 along the axial direction of the rotating shaft 201 and away from the first preload member 300, thereby not only making the installation of the first bearing 202 more stable, but also making the preload force of the first preload member 300 within an appropriate range, and further making the first preload member 300 in a preset position, the preload effect of the first preload member 300 is better, thereby further ensuring the reliability of the motor.

[0085] refer to Figure 2 and Figure 7As shown, in a further embodiment of the utility model, the second stopper 208 is set as an annular structure, and the outer wall of the rotating shaft 201 is provided with an annular groove 209 extending along the circumference of the rotating shaft 201, and the second stopper 208 is installed in the annular groove 209. For example, the second stopper 208 can be an elastic retaining ring for the shaft, and the inner side of the second stopper 208 is inserted in the annular groove 209. In this way, the second stopper 208 can abut against the first bearing 202 at each position along the circumference, so as to have a better limiting effect on the first bearing 202, and the second stopper 208 is more convenient to install and disassemble, and then the rotor assembly 200 and the motor are more convenient to assemble. In addition, when the rotating shaft 201 rotates, the force on the rotating shaft 201 is more uniform, the shaking of the rotating shaft 201 is smaller, and the noise is less.

[0086] It should be noted that in some other embodiments of the present invention, the second limiting member 208 may also be other suitable structures, for example, a block structure, which will not be described in detail here.

[0087] refer to Figure 2 and Figure 3 As shown, in some embodiments of the utility model, the first preload member 300 and / or the second preload member 400 are configured as corrugated gaskets, and the corrugated gaskets are sleeved on the outer side of the rotating shaft 201. The first preload member 300 and / or the second preload member 400 are configured as corrugated gaskets, which are not only easy to install, have high structural strength, and long service life, but also have good elasticity and provide good preload effect. In addition, preload can be provided to the first bearing 202, the second bearing 203, and the third bearing 204 at various positions in the circumferential direction, and the preload effect is better.

[0088] It should be noted that the first pre-tightening member 300 and the second pre-tightening member 400 may also be other pre-tightening structures, for example, a butterfly spring or a coil spring, etc., which will not be described in detail here.

[0089] In a further embodiment of the utility model, the first bearing 202 and the second bearing 203 are both interference fit with the rotating shaft 201, and the first bearing 202 and the second bearing 203 are both clearance fit with the corresponding bearing chamber 102. For example, the first bearing 202 and the second bearing 203 both include an inner ring and an outer ring, the inner ring of the first bearing 202 is interference fit with the rotating shaft 201, the inner ring of the second bearing 203 is interference fit with the rotating shaft 201, the outer ring of the first bearing 202 is clearance fit with the inner circumferential wall of the corresponding bearing chamber 102, and the outer ring of the second bearing 203 is clearance fit with the inner circumferential wall of the corresponding bearing chamber 102.

[0090] In this embodiment, the first bearing 202 and the second bearing 203 are both interference fit with the rotating shaft 201, which can not only ensure the fit between the bearing and the rotating shaft 201, but also make the movement of the bearing and the rotating shaft 201 more stable when running at high speed and high load, and will not cause the transmission system to fail due to looseness or wear. Secondly, the interference fit can improve the torque transmission capacity of the rotating shaft 201. In addition, the interference fit can also improve the anti-seismic ability and impact resistance of the rotating shaft 201. The first bearing 202 and the second bearing 203 are both clearance fit with the bearing chamber 102, which not only makes it more convenient to install the first bearing 202 and the second bearing 203, but also can prevent the first bearing 202 and the second bearing 203 from being squeezed and deformed.

[0091] It should be noted that the third bearing 204 and the rotating shaft 201 may also be interference fit, and the third bearing 204 and the corresponding bearing chamber 102 may also be clearance fit. In addition, the first bearing 202, the second bearing 203 and the third bearing 204 and the rotating shaft 201 may also be in other suitable matching modes, and the first bearing 202, the second bearing 203 and the third bearing 204 and the corresponding bearing chamber 102 may also be in other suitable matching modes, which will not be described in detail here.

[0092] The electrical device according to the second embodiment of the utility model includes the motor according to the first embodiment.

[0093] By adopting the motor of the first aspect embodiment of the utility model, a second preload member 400 is provided on the side of the second bearing 203 facing away from the second abutment surface 104. The preload force provided by the second preload member 400 can partially offset the force applied by the second abutment surface 104, thereby reducing the axial force on the second bearing 203, thereby significantly improving the service life of the bearing and improving the reliability of the motor.

[0094] It should be noted that, since the fan can adopt all the technical solutions of the motor of the first embodiment, it at least has all the beneficial effects brought by the technical solutions of the first embodiment. These additional beneficial effects will not be repeated here.

[0095] It is understandable that other structures and operations of the fan according to the embodiment of the utility model are known to ordinary technicians in the field and will not be described in detail here.

[0096] The electrical equipment according to the embodiment of the third aspect of the utility model includes the fan of the embodiment of the second aspect.

[0097] According to the electrical equipment of the embodiment of the utility model, by adopting the fan of the embodiment of the second aspect of the utility model, the motor of the fan is provided with a second preload member 400 on the side of the second bearing 203 away from the second abutment surface 104. The preload force provided by the second preload member 400 can partially offset the force applied by the second abutment surface 104, thereby reducing the axial force on the second bearing 203, thereby significantly improving the service life of the bearing and improving the reliability of the motor.

[0098] It should be noted that, since the electrical equipment can adopt all the technical solutions of the motor of the first aspect embodiment above, it at least has all the beneficial effects brought by the technical solutions of the first aspect embodiment above, and these additional beneficial effects will not be repeated here.

[0099] It is understandable that other structures and operations of the electrical equipment according to the embodiment of the utility model are known to ordinary technicians in the field and will not be described in detail here.

[0100] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A motor, characterized in that: include: The stator assembly comprises a bearing seat, wherein the bearing seat is provided with two bearing chambers, and a first abutting surface and a second abutting surface are respectively formed on the sides of the two bearing chambers that are close to each other, or a first abutting surface and a second abutting surface are respectively formed on the sides of the two bearing chambers that are far away from each other; A rotor assembly, comprising a rotating shaft, a first bearing, a second bearing and a third bearing, wherein the first bearing, the second bearing and the third bearing are respectively sleeved on the outer side of the rotating shaft, the first bearing is located in one of the bearing chambers, and the second bearing and the third bearing are located in the other bearing chamber; a first preload member, disposed between the first bearing and the first abutment surface, to provide a preload force to the first bearing in a direction away from the first abutment surface; The second preload member abuts against a side of the second bearing away from the second abutting surface to provide a preload force to the second bearing in a direction toward the second abutting surface. The third bearing abuts against a side of the second preload member away from the second bearing.

2. The motor according to claim 1, characterized in that The rotor assembly further includes a first stopper, which is located between the second bearing and the third bearing and abuts against the inner ring of the second bearing and the inner ring of the third bearing respectively.

3. The motor according to claim 2, characterized in that The first position-limiting member is configured as an annular structure, the first position-limiting member is sleeved on the outer side of the rotating shaft, and the second pre-tightening member is located on a side of the first position-limiting member away from the rotating shaft.

4. The motor according to any one of claims 1 to 3, characterized in that The stator assembly further comprises a stator, and the stator is arranged on the bearing seat; The rotor assembly also includes a rotor connected to the rotating shaft and sleeved on the outer side of the stator.

5. The motor according to claim 4, characterized in that The rotor assembly also includes a connecting sleeve, which is sleeved on the outer side of the rotating shaft, and is located on a side of the third bearing away from the second bearing, and the rotor is connected to the connecting sleeve.

6. The electric machine according to any one of claims 1 to 3, characterized in that The rotor assembly further includes a second stopper connected to the rotating shaft, and the second stopper abuts against a side of the first bearing that is away from the first preload member.

7. The motor according to claim 6, characterized in that The second position-limiting member is configured as an annular structure, the outer side wall of the rotating shaft is provided with an annular groove extending along the circumference of the rotating shaft, and the second position-limiting member is installed in the annular groove.

8. The electric machine according to any one of claims 1 to 3, characterized in that The first pre-tightening member and / or the second pre-tightening member are configured as corrugated gaskets, and the corrugated gaskets are sleeved on the outer side of the rotating shaft.

9. The electric machine according to any one of claims 1 to 3, characterized in that The inner ring of the first bearing and the inner ring of the second bearing are respectively interference fit with the rotating shaft, the outer ring of the first bearing and the outer ring of the second bearing are respectively clearance fit with the corresponding inner circumferential wall of the bearing chamber, the first preload member abuts against the outer ring of the first bearing, and the second preload member abuts against the outer ring of the second bearing.

10. A fan, characterized in that: Comprising the electric machine as claimed in any one of claims 1 to 9.

11. An electrical device, characterized in that: Comprising the fan as claimed in claim 10.

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