Three-phase motor rotor

Abstract

The invention relates to the technical field of motors, in particular to a three-phase motor rotor which comprises a rotating shaft and a magnet yoke, the rotating shaft and the magnet yoke are coaxially arranged in a clearance mode, the rotating shaft comprises a key shaft, a rotating shaft groove is formed in the surface of the key shaft, a magnet yoke inner groove is formed in the inner wall of the magnet yoke, and a transmission piece is detachably installed in an assembly space formed by the rotating shaft groove and the magnet yoke inner groove. A first sub-shaft and a second sub-shaft are integrally formed at the two ends of the key shaft, key grooves are formed in the first sub-shaft and the second sub-shaft correspondingly, clamping tongues and grooves are formed in the two sides of the second sub-shaft correspondingly, the ends, close to each other, of the two clamping tongues extend into the corresponding grooves correspondingly, clamping grooves are formed in the inner walls of the bottoms of the grooves, and cavities are formed in the clamping tongues. A rectangular hole is formed in the inner wall of the bottom of the cavity, a clamping column is slidably installed in the rectangular hole, and the bottom end of the clamping column extends into the clamping groove. While the connection rigidity of the rotating shaft and the magnet yoke is maintained, the disassembly and assembly efficiency can be greatly improved, and meanwhile the system reliability and the heat management efficiency are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a three-phase motor rotor. Background Art

[0002] A three-phase asynchronous motor is a type of induction motor powered by a three-phase 380V AC current (with a phase difference of 120 degrees). Because the rotor and stator's rotating magnetic field rotate in the same direction but at different speeds, a slip exists, hence the name. The rotor speed of a three-phase asynchronous motor is lower than that of the rotating magnetic field. The relative motion between the rotor winding and the magnetic field generates an electromotive force and current, which interacts with the magnetic field to produce electromagnetic torque, achieving energy conversion. Compared with single-phase asynchronous motors, three-phase asynchronous motors offer better performance and can save various materials.

[0003] However, the connection between the existing motor yoke and the rotating shaft is complicated. Once damaged and needing to be replaced and repaired, disassembly and assembly is very troublesome and tedious, which greatly affects the disassembly and assembly efficiency. In addition, after the motor rotor rotates for a long time, heat is continuously generated inside, which causes the motor temperature to rise, affecting the normal operation of the motor.

[0004] In view of this, the present invention proposes a three-phase motor rotor to solve the above problems. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art and solve the problems of cumbersome assembly and disassembly between the motor yoke and the rotating shaft, as well as the increase in internal temperature of the motor due to long-term rotation, the present invention proposes a three-phase motor rotor.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a three-phase motor rotor, including a rotating shaft and a yoke, the rotating shaft and the yoke are arranged with a coaxial gap, the rotating shaft includes a key shaft, the surface of the key shaft is provided with a rotating shaft groove, the inner wall of the yoke is provided with a yoke inner groove, and a transmission part is detachably installed in the assembly space formed by the rotating shaft groove and the yoke inner groove. The transmission part is used for assembly limitation of the yoke on the one hand and for torque transmission on the other hand. The first sub-shaft and the second sub-shaft are integrally formed with a first sub-shaft and a second sub-shaft at both ends of the key shaft, the first sub-shaft and the second sub-shaft are provided with a key groove, and the second sub-shaft is provided with a tongue and a groove on both sides, and the two tongues are close to each other at one end The cam is secured to the bottom of the cam and is secured to the cam face with an angular channel formed between the centre of the cam and the centre of the cam, the cam being secured to the cam face with a channel slot and a centred channel having two cams connected.

[0007] Preferably, the transmission member can be configured as a rubber block, and the side wall edges of the shaft groove and the yoke inner groove that contact the rubber block are provided with rounded corners.

[0008] Preferably, the width of the rubber block is greater than the distance between the key shaft and the magnetic yoke.

[0009] Preferably, an anti-skid washer is fixedly mounted on the inner wall of the groove, and the anti-skid washer is made of a rubber material with a high friction coefficient, and the tongue and the inner wall of the anti-skid washer are tightly in contact with each other.

[0010] Preferably, sealing rings are fixedly installed in the sliding hole and the rectangular hole, and the push rod and the clamping column respectively pass through the corresponding sealing rings and are slidably connected to the inner walls of the corresponding sealing rings.

[0011] Preferably, the two tongues are bent on sides close to each other to form barbs.

[0012] Preferably, the end of the magnetic yoke close to the second sub-shaft is provided with two bayonet holes adapted to the latch tongues.

[0013] Preferably, the transmission member can also be configured as a metal sheet group, wherein the metal sheet group is composed of a plurality of metal sheets, and lubricating oil is applied between adjacent metal sheets.

[0014] Preferably, a plurality of protrusions are evenly distributed along the circumferential direction on the inner surface of the magnetic yoke.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The present invention greatly simplifies the disassembly process by optimizing the connection structure between the rotating shaft and the magnetic yoke, adopting a tongue and slot matching design, and combining it with a spring-driven column locking mechanism. During maintenance, only the push plate needs to be pressed to release the connection, so that the magnetic yoke and the rotating shaft can be quickly separated, which significantly improves the disassembly and assembly efficiency. At the same time, the matching of the barb structure and the anti-slip washer enhances the stability after assembly, avoids the deviation problem caused by vibration during operation, and ensures both connection strength and operational convenience.

[0017] 2. The present invention achieves dual optimization of power transmission and thermal management through the innovative design of elastic rubber blocks or replaceable metal plate groups. The rubber blocks absorb instantaneous impacts through deformation, and their rounded corners avoid local wear. The metal plate group uses interlayer lubricating oil to achieve smooth transmission and forms a two-way heat dissipation path through thermal conductivity. When an overload occurs, the elastic deformation of the metal sheet causes it to contact the protrusions on the inner wall of the yoke, maintaining power transmission and enhancing heat dissipation. It automatically resets when the load returns to normal, effectively improving system reliability and thermal management efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 Schematic diagram of the three-dimensional structure of the rotating shaft in the present invention;

[0021] Figure 3 This is a front sectional assembly drawing of the second rotating shaft and two latches in the present invention;

[0022] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part A;

[0023] Figure 5 This is a top view of the assembly of the key shaft and the magnetic yoke in the present invention;

[0024] Figure 6 Schematic diagram of the three-dimensional structure of the metal sheet in the present invention;

[0025] In the figure: 1. Rotating shaft; 101. Key shaft; 102. First sub-shaft; 103. Second sub-shaft; 10301. Groove; 10302. Slot; 104. Rotating shaft groove; 105. Bump; 2. Yoke; 201. Yoke inner groove; 3. Tongue; 301. Chamber; 302. Rectangular hole; 303. Column; 304. Baffle; 305. Spring; 306. Push rod; 307. Sliding hole; 4. Transmission part; 401. Rubber block; 5. Metal sheet. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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 making creative efforts are within the scope of protection of the present invention.

[0027] Please refer to Figure 1-5 The present invention provides a technical solution: a three-phase motor rotor, comprising a rotating shaft 1 and a yoke 2, wherein the rotating shaft 1 and the yoke 2 are arranged with a coaxial gap, the rotating shaft 1 comprises a key shaft 101, a rotating shaft groove 104 is provided on the surface of the key shaft 101, a yoke inner groove 201 is provided on the inner wall of the yoke 2, a transmission member 4 is detachably installed in the assembly space formed by the rotating shaft groove 104 and the yoke inner groove 201, the transmission member 4 is used for assembly limiting of the yoke 2 on the one hand, and for transmitting torque on the other hand, a first sub-shaft 102 and a second sub-shaft 103 are integrally formed at both ends of the key shaft 101, a key groove is provided on each of the first sub-shaft 102 and the second sub-shaft 103, a latch 3 and a groove 10301 are provided on both sides of the second sub-shaft 103, the ends of the two latches 3 close to each other extend into the corresponding groove 10301 respectively, the groove When the cam 310 is unlocked, the latch 303 is unlocked and the latch 303 is unlocked, so that the cam 303 can be unlocked.

[0028] By adopting the above technical solution, the gap arrangement between the shaft 1 and the yoke 2 is conducive to improving the heat dissipation efficiency of the yoke 2 and facilitating the installation of the shaft 1 and the yoke 2. When removing the yoke 2 from the shaft 1, the operator presses the push plates on both sides along the axial direction of the yoke 2. The push plates drive the baffle 304 away from the rectangular hole 302 through the push rod 306, and the baffle 304 drives the clamping column 303 to disengage from the slot 10302. At this time, the two latches 3 can be removed from the corresponding grooves 10301, and then the yoke can be removed by tools. 2 is removed from the key shaft 101; when installing the yoke 2 on the rotating shaft 1, the two latching tongues 3 are inserted into the corresponding grooves 10301. When the two latching posts 303 are respectively above the corresponding latching slots 10302, the two baffles 304, under the elastic force of the two springs 305, respectively drive the two latching posts 303 into the corresponding latching slots 10302. At the same time, the two latching tongues 3 are locked into the two latching holes on the yoke 2, so that the yoke 2 will not deviate on the rotating shaft 1 during rotation. This structure achieves rapid assembly and disassembly through the spring-stud linkage mechanism, greatly improving assembly and disassembly efficiency while maintaining the rigidity of the connection between the rotating shaft 1 and the yoke 2.

[0029] As an embodiment of the present invention, the transmission member 4 can be configured as a rubber block 401 , and the side wall edges of the shaft groove 104 and the yoke inner groove 201 contacting the rubber block 401 are provided with rounded corners.

[0030] By adopting the above technical solution, when the motor starts, the yoke 2 pushes the rubber block 401 through the sidewalls of the yoke inner groove 201 during the initial rotation phase. The rubber block 401 deforms due to its own elasticity to absorb the instantaneous impact, achieving a buffered transition in power transmission. As the speed increases to normal operating conditions, the rubber block 401 transmits a stable torque to the rotating shaft 1. During this process, the rounded corners of the contact surface between the rotating shaft groove 104 and the yoke inner groove 201 and the rubber block 401 ensure that the rubber block 401 maintains surface contact with the groove wall, preventing local wear of the rubber block 401 caused by sharp corners. At the same time, the rubber block 401 can radially support the yoke 2 to maintain the coaxial arrangement of the yoke 2 and the rotating shaft 1, achieving effective torque transmission. This design allows the rubber block 401 to offset the instantaneous torque during startup during actual use, achieving a soft start of the motor and reducing motor damage.

[0031] As an embodiment of the present invention, the width of the rubber block 401 is greater than the distance between the key shaft 101 and the magnetic yoke 2 .

[0032] By adopting this technical solution, when the motor is overloaded, the overload force may cause radial displacement of rubber block 401. However, because the width of rubber block 401 is greater than the distance between key shaft 101 and yoke 2, the displacement of rubber block 401 is physically blocked by the groove walls on both sides, thus preventing rubber block 401 from separating from shaft groove 104 and yoke inner groove 201. This design, through the synergistic effect of elastic buffering and mechanical limiters, achieves both soft starting and structural reliability during overload.

[0033] As an embodiment of the present invention, an anti-slip washer is fixedly installed on the inner wall of the groove 10301. The anti-slip washer is made of a rubber material with a high friction coefficient. The tongue 3 and the inner wall of the anti-slip washer are tightly in contact with each other.

[0034] By adopting the above technical solution, when the tongue 3 is inserted into the groove 10301, the anti-slip washer is squeezed by the tongue 3 to produce elastic deformation. During the operation of the motor, the elastic recovery force of the anti-slip washer continuously applies radial clamping force to the tongue 3. Through this structural design, when the motor rotates at high speed, the anti-slip washer absorbs the high-frequency micro-vibration between the tongue 3 and the groove 10301 through friction damping, thereby preventing the formation of a gap between the card column 303 and the card slot 10302 due to vibration impact.

[0035] As an embodiment of the present invention, sealing rings are fixedly installed in the sliding hole 307 and the rectangular hole 302 , and the push rod 306 and the clamping column 303 respectively penetrate the corresponding sealing rings and are slidably connected to the inner walls of the corresponding sealing rings.

[0036] By adopting the above technical solution, when the motor rotates at high speed and generates centrifugal force, the sealing ring effectively blocks external dust from invading the chamber 301, and at the same time prevents the grease in the chamber 301 from overflowing along the sliding hole 307 due to centrifugal action, thereby ensuring the long-term lubrication state of the push rod 306 and the clamping column 303.

[0037] As an embodiment of the present invention, the two sides of the two latching tongues 3 that are close to each other are bent to form barbs.

[0038] By adopting the above technical solution, when the tongue 3 is inserted into the groove 10301, the guiding inclined surface of the barb is locked into the two slots on the yoke 2, forming a mechanical interlock, so that the yoke 2 will not be offset on the shaft 1 when rotating.

[0039] As an embodiment of the present invention, the end of the magnetic yoke 2 close to the second sub-shaft 103 is provided with two bayonet holes adapted to the latch tongue 3 .

[0040] By adopting the above technical solution, when the tongue 3 is inserted into the groove 10301, the hook of the tongue 3 is locked into the socket, and the yoke 2 is engaged with the rotating shaft 1, thereby strengthening the fixing effect between the yoke 2 and the rotating shaft 1 and preventing the yoke 2 from being offset on the rotating shaft 1 when rotating.

[0041] In other embodiments of the present invention, the rubber block 401 can also be replaced by a metal sheet 5; Figure 6 As shown, the transmission member 4 can also be configured as a metal sheet group, which is composed of a plurality of metal sheets 5 , and lubricating oil is applied between adjacent metal sheets 5 .

[0042] As an embodiment of the present invention, a plurality of protrusions 105 are evenly distributed along the circumferential direction on the inner surface of the magnetic yoke 2 .

[0043] When the motor begins to rotate, the sidewalls of the yoke's inner groove 201 push against the stacked metal sheets 5. Lubricant is filled between these thin metal sheets 5, gradually transferring power to the shaft 1 for a smooth start. The excellent thermal conductivity of the metal sheets 5 allows heat to escape in two ways: some heat is dissipated directly into the air through the metal sheets 5, while the other heat is transferred along the metal sheets 5 to the interior of the shaft 1 for dissipation, forming a bidirectional heat dissipation path.

[0044] If the motor is suddenly overloaded, the excessive force will cause the metal sheet 5 to deform. The end originally inserted into the yoke inner slot 201 will bend and deform, thereby separating from the yoke inner slot 201. The end of the metal sheet 5 that has separated from the yoke inner slot 201 will contact the protrusion 105 on the inner wall of the yoke 2. At this time, the contact surface between the metal sheet 5 and the protrusion 105 increases the heat dissipation area. At the same time, the protrusion 105 exerts a reaction force on the metal sheet 5 to maintain power transmission. When the speed returns to normal, the bent metal sheet 5 will re-enter the yoke inner slot 201 due to its own elasticity, restoring the original transmission state. The entire process does not require manual intervention. This design not only avoids the problem of easy aging of the rubber block 401, but also solves the heat dissipation problem. Even in the event of a sudden overload, power transmission will not be interrupted. Instead, the deformable structure can automatically enhance heat dissipation capacity. In addition, when the metal sheet 5 separates from the yoke inner slot 201 and contacts the protrusion 105, an alarm will sound, which serves to warn the operator of the excessive load, so that the motor load can be adjusted in time.

[0045] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A three-phase motor rotor, comprising a rotating shaft (1) and a magnetic yoke (2), characterized in that: The rotating shaft (1) and the magnetic yoke (2) are arranged with a coaxial gap. The rotating shaft (1) includes a key shaft (101). A rotating shaft groove (104) is provided on the surface of the key shaft (101). A magnetic yoke inner groove (201) is provided on the inner wall of the magnetic yoke (2). A transmission member (4) is detachably installed in the assembly space formed by the rotating shaft groove (104) and the magnetic yoke inner groove (201). The transmission member (4) is used for assembly limiting of the magnetic yoke (2) on the one hand and for torque on the other hand. The key shaft (101) is integrally formed with a first sub-shaft (102) and a second sub-shaft (103) at both ends. A key slot is provided on each of the first sub-shaft (102) and the second sub-shaft (103). A latching tongue (3) and a groove (10301) are provided on both sides of the second sub-shaft (103). The ends of the two latching tongues (3) close to each other extend into the corresponding grooves (10301). The inner wall of the bottom of the groove (10301) is provided with a latching groove (10301). 302), a chamber (301) is provided on the tongue (3), a rectangular hole (302) is provided on the bottom inner wall of the chamber (301), a post (303) is slidably installed in the rectangular hole (302), the bottom end of the post (303) extends into the slot (10302), a baffle (304) is fixedly installed on the top of the post (303), a spring (305) is fixedly installed on the bottom of the baffle (304), and the spring (305) is fixedly installed on the bottom of the baffle (304). ) is fixedly connected to the bottom inner wall of the chamber (301), and the spring (305) is slidably mounted on the clamping column (303). A sliding hole (307) is provided on the bottom inner wall of the chamber (301), and a push rod (306) is slidably installed in the sliding hole (307). The top end of the push rod (306) is fixedly connected to the top of the baffle (304), and the bottom end of the push rod (306) extends outside the sliding hole (307) and is fixedly mounted with a push plate.

2. A three-phase motor rotor according to claim 1, characterized in that: The transmission member (4) can be configured as a rubber block (401), and the side wall edges of the rotating shaft groove (104), the yoke inner groove (201) and the rubber block (401) in contact with each other are provided with rounded corners.

3. A three-phase motor rotor according to claim 2, characterized in that: The width of the rubber block (401) is greater than the distance between the key shaft (101) and the magnetic yoke (2).

4. The three-phase motor rotor according to claim 1, characterized in that: An anti-skid washer is fixedly mounted on the inner wall of the groove (10301), and the anti-skid washer is made of a rubber material with a high friction coefficient. The latch tongue (3) and the inner wall of the anti-skid washer are in tight contact with each other.

5. The three-phase motor rotor according to claim 1, characterized in that: Sealing rings are fixedly installed in the sliding hole (307) and the rectangular hole (302), and the push rod (306) and the clamping column (303) respectively penetrate the corresponding sealing rings and are slidably connected to the inner walls of the corresponding sealing rings.

6. The three-phase motor rotor according to claim 1, characterized in that: One side of the two latching tongues (3) close to each other is bent to form a barb.

7. The three-phase motor rotor according to claim 1, characterized in that: The magnetic yoke (2) is provided with two bayonet holes adapted to the bayonet tongue (3) at one end close to the second sub-shaft (103).

8. The three-phase motor rotor according to claim 1, characterized in that: The transmission member (4) can also be configured as a metal sheet group, wherein the metal sheet group is composed of a plurality of metal sheets (5), and lubricating oil is applied between adjacent metal sheets (5).

9. The three-phase motor rotor according to claim 1, characterized in that: The inner surface of the magnetic yoke (2) is provided with a plurality of protrusions (105) evenly distributed along the circumferential direction.

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