A direct-drive permanent magnet synchronous motor for mining

Abstract

The present application relates to the field of motor technology, and discloses a direct-drive permanent magnet synchronous motor for mining, including a vibration isolation shaft, one end of the vibration isolation shaft close to the rotor shaft is movably connected to a buffer cylinder through a ball seat, the vibration isolation shaft can rotate in any direction around the center of the buffer cylinder, the center of the buffer cylinder is on the axis of the rotor shaft, the position of the vibration isolation shaft close to the end of the buffer cylinder is connected to the buffer cylinder through a buffer seat, and the distance between the end of the vibration isolation shaft close to the rotor shaft and the center of the buffer cylinder is smaller than the distance between the other end and the center of the buffer cylinder. A direct-drive permanent magnet synchronous motor for mining provided by the present invention is connected to the input shaft of the load through the vibration isolation shaft, when the vibration of the load is transmitted to the vibration isolation shaft, one end of the vibration isolation shaft is used to absorb the vibration energy, and the other end constrains the vibration of the vibration isolation shaft to reduce the amplitude of the vibration isolation shaft, and at the same time, the vibration isolation shaft is connected to the rotor shaft through a buffer sleeve, which effectively isolates the transmission of vibration.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a direct-drive permanent magnet synchronous motor for mining. Background Art

[0002] Direct-drive permanent magnet synchronous motors eliminate intermediate transmission components such as reducers, belts, chains, etc., reducing vibration, impact and noise caused by mechanical transmission.

[0003] Direct-drive permanent magnet synchronous motors usually need to be directly connected to the load, which requires high installation accuracy. If there is a deviation during the installation process, it may cause the connection between the motor and the load to be loose, affecting the performance and service life of the motor.

[0004] Secondly, when the motor is running, the vibration of the load will be directly transmitted to the rotor through the shaft, causing the permanent magnet to vibrate. In some permanent magnet synchronous motors, the permanent magnet is not effectively fixed. The permanent magnet may be partially demagnetized or the overall magnetism may be weakened due to the stress generated by the vibration, thereby reducing the performance of the motor. Summary of the invention

[0005] The present application proposes a direct-drive permanent magnet synchronous motor for mining, which is connected to the input shaft of the load through a vibration isolation shaft. One end of the vibration isolation shaft can undergo a large radial movement and absorb a large amount of vibration energy. The other end constrains the vibration of the vibration isolation shaft, reduces the amplitude of the vibration isolation shaft, isolates the vibration transmitted from the load input shaft, and reduces installation requirements.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a direct-drive permanent magnet synchronous motor for mining, comprising a motor housing and a rotor shaft, the rotor shaft being fixedly connected to the rotor, the motor housing being fixedly connected to a buffer cylinder, the buffer cylinder being coaxial with the rotor shaft, a vibration isolation shaft being provided in the buffer cylinder, the end of the vibration isolation shaft close to the rotor shaft being movably connected to the buffer cylinder through a ball seat, the vibration isolation shaft can rotate in any direction around the center of the buffer cylinder, the center of the buffer cylinder is on the axis of the rotor shaft, the position of the vibration isolation shaft close to the end of the buffer cylinder is connected to the buffer cylinder through a buffer seat, the distance between the end of the vibration isolation shaft close to the rotor shaft and the center of the buffer cylinder is smaller than the distance between the other end and the center of the buffer cylinder, and the vibration isolation shaft is drivingly connected to the rotor shaft through a buffer sleeve that can absorb impact.

[0007] Furthermore, the ball seat includes a spherical seat fixedly connected to the inner wall of the buffer cylinder, the spherical seat is movably connected to a spherical sleeve, the spherical sleeve is connected to the vibration isolation shaft through a first bearing, the vibration isolation shaft can rotate freely around the center of the spherical seat, and the vibration isolation shaft can also rotate freely relative to the spherical sleeve through the first bearing.

[0008] Furthermore, the buffer seat includes a second bearing connected to the inner wall of the buffer cylinder, the inner wall of the second bearing is connected to an outer connecting sleeve, the outer side wall of the vibration isolation shaft is fixedly connected to an inner connecting sleeve, and spokes are provided between the outer connecting sleeve and the inner connecting sleeve, and the deformation and bending of the spokes buffer and absorb the main vibration energy.

[0009] Furthermore, the buffer sleeve includes a transmission block fixedly connected to the rotor shaft and a driven block fixedly connected to the vibration isolation shaft, the transmission block and the driven block overlap in the axial direction of the vibration isolation shaft, a buffer block capable of buffering is provided between the transmission block and the driven block, and the vibration transmitted by the vibration isolation shaft is absorbed by the buffer block.

[0010] Furthermore, the cross-sections of the transmission block, driven block and buffer block are all fan rings, the transmission block, driven block and buffer block form a complete circular ring, and buffer blocks are provided on both sides of the transmission block and driven block.

[0011] Furthermore, a sensor is provided in the buffer cylinder, and a permanent magnet is provided on the outer wall of the buffer block. The interaction force between the transmission block, the driven block and the buffer block can push the permanent magnet to move. The sensor can sense the magnetic field of the permanent magnet and judge the output torque of the rotor shaft according to the extreme value of each segment of the magnetic field data.

[0012] Furthermore, the buffer block can slide under the action of the transmission block and the driven block, and the buffer block is connected with a tension belt, which pulls the buffer block toward the axis.

[0013] Furthermore, the buffer block includes an elastomer, a cavity is provided in the elastomer, a magnetic frame and two groups of clamps are provided in the cavity, the two groups of clamps are respectively flush with the two side walls of the elastomer, the clamps are always pressed against the transmission block or the driven block, the two groups of clamps are hinged with connecting rods, the connecting rods are hinged to the magnetic frame, the magnetic frame is used to fix the permanent magnet, and the buffer block is fixed on the transmission block or the driven block.

[0014] Furthermore, the transmission blocks and driven blocks are each provided with two groups, and the buffer blocks are provided with four groups. Permanent magnets are provided on the four groups of buffer blocks. Along the reverse direction of rotation, the sensor senses that the extreme values ​​of the magnetic field data of each permanent magnet increase or decrease in sequence. When the first permanent magnet is aligned with the sensor, the rotor shaft is at an angle of 0 degrees. When the remaining three permanent magnets are aligned with the sensor in sequence, the rotor shaft is at an angle of 90 degrees, 180 degrees and 270 degrees, respectively.

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

[0016] The present application provides a direct-drive permanent magnet synchronous motor for mining, which is connected to the input shaft of the load through a vibration isolation shaft. One end of the vibration isolation shaft can undergo a relatively large radial movement, while the ball seat and the buffer seat can undergo a relatively small axial movement. This ensures that even if there is a relatively large installation deviation between the vibration isolation shaft and the input shaft of the load, relatively large vibration will not occur, thereby reducing the requirements for installation accuracy.

[0017] Secondly, when the vibration of the load is transmitted to the vibration isolation shaft, one end of the vibration isolation shaft is used to absorb the vibration energy, and the other end constrains the vibration of the vibration isolation shaft to reduce the amplitude of the vibration isolation shaft. At the same time, the vibration isolation shaft is connected to the rotor shaft through a buffer sleeve, which effectively isolates the transmission of vibration, reduces the influence of load vibration on the rotor, and improves the service life of the mining direct-drive permanent magnet synchronous motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention 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. Obviously, the drawings in the following description are only embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without creative work:

[0019] Figure 1 It is a structural schematic diagram of the first embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure in the first embodiment of the present invention;

[0021] Figure 3 It is a partial schematic diagram of the first embodiment of the present invention;

[0022] Figure 4 It is a three-dimensional schematic diagram of the buffer sleeve in the first embodiment of the present invention;

[0023] Figure 5 It is a side view of the buffer sleeve in the first embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of a buffer block in the second embodiment of the present invention.

[0025] In the figure: 1. motor housing; 2. rotor shaft; 3. buffer cylinder; 4. vibration isolation shaft; 5. ball seat; 51. spherical seat; 52. spherical sleeve; 53. first bearing; 6. buffer seat; 61. second bearing; 62. outer connecting sleeve; 63. spokes; 64. inner connecting sleeve; 7. buffer sleeve; 71. transmission block; 72. driven block; 73. buffer block; 731. elastic block; 732. splint; 733. cavity; 734. magnet frame; 735. connecting rod; 74. tension belt; 8. permanent magnet; 9. inductor. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0027] For example, see Figure 1-Figure 2 A direct-drive permanent magnet synchronous motor for mining includes a motor housing 1 and a rotor shaft 2, the rotor shaft 2 is fixedly connected to the rotor, the motor housing 1 is fixedly connected with a buffer cylinder 3, the buffer cylinder 3 is integrated with the motor housing 1, and the buffer cylinder 3 is ensured to be coaxial with the rotor shaft 2. A vibration isolation shaft 4 is provided in the buffer cylinder 3, and the end of the vibration isolation shaft 4 close to the rotor shaft 2 is movably connected to the buffer cylinder 3 through a ball seat 5, and the vibration isolation shaft 4 can rotate in any direction around the ball center of the buffer cylinder 3, and the ball center of the buffer cylinder 3 is on the axis of the rotor shaft 2. The position of the vibration isolation shaft 4 close to the end of the buffer cylinder 3 is connected to the buffer cylinder 3 through a buffer seat 6, and the distance l between the end of the vibration isolation shaft 4 close to the rotor shaft 2 and the ball center of the buffer cylinder 3 is smaller than the distance l between the end of the vibration isolation shaft 4 close to the rotor shaft 2 and the ball center of the buffer cylinder 3 The distance L between the center of the buffer cylinder 3 and the center of the ball is 2 to 5 times of l. The vibration isolation shaft 4 is connected to the input shaft of the load through the input shaft. The vibration transmitted by the load is transmitted to the end of the vibration isolation shaft 4 through the input shaft. The end of the vibration isolation shaft 4 vibrates under the constraint of the buffer seat 6. The buffer seat 6 absorbs the energy of the vibration and reduces the energy transmitted to the buffer cylinder 3. At the same time, since the vibration isolation shaft 4 is constrained by the ball seat 5, the amplitude of the end of the vibration isolation shaft 4 close to the rotor shaft 2 is greatly reduced. The vibration isolation shaft 4 is connected to the rotor shaft 2 through the buffer sleeve 7. The remaining vibration energy is absorbed by the buffer sleeve 7, which reduces the vibration energy absorbed by the rotor shaft 2 and the vibration of the permanent magnet in the rotor. At the same time, it also reduces the impact on the installation accuracy.

[0028] See also Figure 3 The ball seat 5 includes a spherical seat 51 fixedly connected to the inner wall of the buffer cylinder 3, and the spherical seat 51 is movably connected to a spherical sleeve 52. The spherical sleeve 52 is connected to the vibration isolation shaft 4 through a first bearing 53. Since the ball seat 5 will also be affected by the vibration of the vibration isolation shaft 4, a buffer layer is provided between the spherical seat 51 and the buffer cylinder 3. The buffer layer is made of an elastic material, and the elastic material can be polyurethane. The spherical seat 51 can move axially with a small amplitude, and the vibration isolation shaft 4 can rotate freely around the center of the spherical seat 51. At the same time, the vibration isolation shaft 4 can also rotate freely relative to the spherical sleeve 52 through the first bearing 53.

[0029] The buffer seat 6 includes a second bearing 61 connected to the inner wall of the buffer cylinder 3. The second bearing 61 can move axially in a small range. The inner wall of the second bearing 61 is connected to an outer connecting sleeve 62. The outer wall of the vibration isolation shaft 4 is fixedly connected to an inner connecting sleeve 64. Spokes 63 are arranged between the outer connecting sleeve 62 and the inner connecting sleeve 64. The deformation and bending of the spokes 63 buffer and absorb the main vibration energy. When there is a deviation in the installation between the vibration isolation shaft 4 and the input shaft of the load, the spokes 63 can also adapt to the installation deviation by bending and deforming.

[0030] See also Figure 3-Figure 5 The buffer sleeve 7 includes a transmission block 71 fixedly connected to the rotor shaft 2 and a driven block 72 fixedly connected to the vibration isolation shaft 4. The transmission block 71 and the driven block 72 overlap in the axial direction of the vibration isolation shaft 4. A buffer block 73 capable of buffering is provided between the transmission block 71 and the driven block 72. The transmission block 71 rotates as the rotor shaft 2 rotates. When the transmission block 71 rotates, the buffer block 73 presses against the driven block 72, thereby pushing the driven block 72 and the vibration isolation shaft 4 to rotate, and the vibration transmitted by the vibration isolation shaft 4 is absorbed by the buffer block 73.

[0031] The cross-sections of the transmission block 71, the driven block 72 and the buffer block 73 are all fan rings. The transmission block 71, the driven block 72 and the buffer block 73 form a complete ring. The three are always pressed against each other to avoid impact. Buffer blocks 73 are provided on both sides of the transmission block 71 and the driven block 72. For example, the transmission block 71 and the driven block 72 are each provided with one group, then the buffer block 73 is provided with two groups. Buffer blocks 73 are provided on both sides of the transmission block 71 or the driven block 72. The transmission block 71 and the driven block 72 are each provided with two groups, then the buffer block 73 is provided with four groups. Figure 4 shown.

[0032] See also Figure 3-Figure 5 A sensor 9 is provided in the buffer cylinder 3. The sensor 9 can be provided on the inner wall of the buffer cylinder 3 or on the end of the motor housing 1 or the spherical seat 51. A permanent magnet 8 is provided on the outer wall of the buffer block 73. The buffer block 73 is connected to a tension belt 74. The tension belt 74 pulls the buffer block 73 toward the axis. When the rotor shaft 2 drives the transmission block 71 to rotate, the interaction force between the transmission block 71, the driven block 72 and the buffer block 73 will push the buffer block 73 outward, and the buffer block 73 moves outward. The larger the minimum gap between the permanent magnet 8 and the sensor 9, that is, the larger the maximum magnetic field sensed by the sensor 9, the greater the torque output by the rotor shaft 2 can be determined by the maximum magnetic field. The sensor 9 can sense the magnetic field of the permanent magnet 8 and determine the output torque of the rotor shaft 2 based on the magnetic field data.

[0033] There are two groups of transmission blocks 71 and driven blocks 72, and four groups of buffer blocks 73. Permanent magnets 8 are provided on the four groups of buffer blocks 73. Along the rotation direction, the sensor 9 senses that the extreme values ​​of the magnetic field data of each permanent magnet 8 increase or decrease in turn. To this end, the magnetic force of each permanent magnet 8 is different, or the depth of each permanent magnet 8 embedded in the buffer block 73 is different. When the first permanent magnet 8 is aligned with the sensor 9, the rotor shaft 2 is at a 0-degree angle. When the remaining three permanent magnets 8 are aligned with the sensor 9 in turn, the rotor shaft 2 is at 90 degrees, 180 degrees and 270 degrees respectively. The two opposite buffer blocks 73 are connected together by a tension belt 74. The four groups of permanent magnets 8 can verify each other to ensure the reliability of the torque data, and can also preliminarily judge the rotation amount and rotation position of the rotor shaft 2. For scenarios with low requirements, the buffer sleeve 7, permanent magnet 8 and sensor 9 can be used as a rotary sensor. For scenarios with higher requirements, it can be used to assist in judging whether the rotary sensor data is reliable and whether the rotary sensor fails.

[0034] Embodiment 2: In Embodiment 1, since the buffer block 73 itself will deform, the buffer block 73 will deform at the moment when the torque occurs. Only when the torque is stabilized and reaches equilibrium, the buffer block 73 can move a corresponding amount, and there is a large delay in the measured torque data. Therefore, in Embodiment 2, the setting mode of the permanent magnet 8 is adjusted. In Embodiment 2, please refer to Figure 6 The buffer block 73 includes an elastic body 731, a cavity 733 is provided in the elastic body 731, a magnet frame 734 and two groups of clamps 732 are provided in the cavity 733, the two groups of clamps 732 are flush with the two side walls of the elastic body 731 respectively, the clamps 732 are always pressed against the transmission block 71 or the driven block 72, the two groups of clamps 732 are hinged with connecting rods 735, the connecting rods 735 are hinged with the magnet frame 734, the magnet frame 734 is used to fix the permanent magnet 8, the buffer block 73 is fixed on the transmission block 71 or the driven block 72 and cannot slide. When the torque becomes larger, the buffer block 73 is deformed, the movement of the clamps 732 becomes larger, the magnet frame 734 is pushed out more, the minimum distance between the permanent magnet 8 and the inductor 9 becomes smaller, and the maximum magnetic field becomes larger.

[0035] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A direct-drive permanent magnet synchronous motor for mining, comprising a motor housing (1) and a rotor shaft (2), wherein the rotor shaft (2) is fixedly connected to the rotor, and characterized in that: The motor housing (1) is fixedly connected with a buffer cylinder (3), the buffer cylinder (3) and the rotor shaft (2) are coaxial, a vibration isolation shaft (4) is provided in the buffer cylinder (3), one end of the vibration isolation shaft (4) close to the rotor shaft (2) is movably connected to the buffer cylinder (3) via a ball seat (5), the vibration isolation shaft (4) can rotate in any direction around the center of the buffer cylinder (3), the center of the buffer cylinder (3) is on the axis of the rotor shaft (2), the position of the vibration isolation shaft (4) close to the end of the buffer cylinder (3) is connected to the buffer cylinder (3) via a buffer seat (6), the distance between the end of the vibration isolation shaft (4) close to the rotor shaft (2) and the center of the buffer cylinder (3) is smaller than the distance between the other end and the center of the buffer cylinder (3), the vibration isolation shaft (4) is drivingly connected to the rotor shaft (2) via a buffer sleeve (7) capable of absorbing impact; The ball seat (5) comprises a spherical seat (51) fixedly connected to the inner wall of the buffer cylinder (3), the spherical seat (51) being movably connected to a spherical sleeve (52), and the spherical sleeve (52) being connected to the vibration isolation shaft (4) via a first bearing (53); The buffer seat (6) comprises a second bearing (61) connected to the inner wall of the buffer cylinder (3); the inner wall of the second bearing (61) is connected to an outer connecting sleeve (62); the outer wall of the vibration isolation shaft (4) is fixedly connected to an inner connecting sleeve (64); and spokes (63) are provided between the outer connecting sleeve (62) and the inner connecting sleeve (64); The buffer sleeve (7) comprises a transmission block (71) fixedly connected to the rotor shaft (2) and a driven block (72) fixedly connected to the vibration isolation shaft (4); the transmission block (71) and the driven block (72) overlap in the axial direction of the vibration isolation shaft (4); and a buffer block (73) capable of buffering is provided between the transmission block (71) and the driven block (72).

2. The direct-drive permanent magnet synchronous motor for mining according to claim 1, characterized in that: The cross-sections of the transmission block (71), the driven block (72) and the buffer block (73) are all fan-shaped rings. The transmission block (71), the driven block (72) and the buffer block (73) form a complete circular ring. The buffer blocks (73) are provided on both sides of the transmission block (71) and the driven block (72).

3. The direct-drive permanent magnet synchronous motor for mining according to claim 2, characterized in that: An inductor (9) is provided in the buffer cylinder (3), and a permanent magnet (8) is provided on the outer wall of the buffer block (73). The interaction force between the transmission block (71), the driven block (72) and the buffer block (73) can push the permanent magnet (8) to move. The inductor (9) can sense the magnetic field of the permanent magnet (8) and judge the output torque of the rotor shaft (2) according to the extreme value of each magnetic field change.

4. The direct-drive permanent magnet synchronous motor for mining according to claim 3, characterized in that: The buffer block (73) can slide under the action of the transmission block (71) and the driven block (72); the buffer block (73) is connected to a tension belt (74); and the tension belt (74) pulls the buffer block (73) toward the axis.

5. The direct-drive permanent magnet synchronous motor for mining according to claim 3, characterized in that: The buffer block (73) comprises an elastic body (731), a cavity (733) is provided in the elastic body (731), a magnet frame (734) and two groups of clamping plates (732) are provided in the cavity (733), the two groups of clamping plates (732) are respectively flush with two side walls of the elastic body (731), the clamping plates (732) always press against the transmission block (71) or the driven block (72), the two groups of clamping plates (732) are both hinged with connecting rods (735), the connecting rods (735) are hinged with the magnet frame (734), the magnet frame (734) is used to fix the permanent magnet (8), and the buffer block (73) is fixed on the transmission block (71) or the driven block (72).

6. The direct-drive permanent magnet synchronous motor for mining according to claim 4 or 5, characterized in that: The transmission block (71) and the driven block (72) are each provided with two groups, and the buffer block (73) is provided with four groups. The four groups of buffer blocks (73) are each provided with a permanent magnet (8). Along the reverse direction of rotation, the sensor (9) senses that the extreme values ​​of the magnetic field data of each permanent magnet (8) increase or decrease in sequence. When the first permanent magnet (8) is aligned with the sensor (9), the rotor shaft (2) is at an angle of 0 degrees. When the remaining three permanent magnets (8) are aligned with the sensor (9) in sequence, the rotor shaft (2) is at an angle of 90 degrees, 180 degrees, and 270 degrees, respectively.

Images