Rotor assembly and motor having it

Abstract

This invention provides a rotor assembly and a motor having the same. The rotor assembly includes: a rotor core with magnetic poles, permanent magnet slots constructed within the magnetic poles, permanent magnets assembled within the permanent magnet slots, and the permanent magnets having a first excitation magnetic field position and a second excitation magnetic field position within the permanent magnet slots. The excitation magnetic field generated by the permanent magnets at the first excitation magnetic field position is stronger than the excitation magnetic field generated by the permanent magnets at the second excitation magnetic field position. A position adjustment mechanism can adjust the switching between the first and second excitation magnetic field positions of the permanent magnets. According to this invention, by adjusting the position of the permanent magnets within the permanent magnet slots, the magnitude of the excitation magnetic field provided by the rotor is adjustable. This eliminates the need for field weakening speed regulation via a controller, thus avoiding problems such as increased operating current, reduced motor efficiency, and the risk of permanent magnet demagnetization. It also eliminates the need to sacrifice low-frequency energy efficiency in the design by reducing the permanent magnet excitation magnetic field to meet higher frequency operating speed regulation requirements.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to a rotor assembly and a motor having the same. Background Technology

[0002] Permanent magnet synchronous motors (PMSMs) offer advantages such as high efficiency, high power factor, and reliability. However, due to the use of permanent magnets to provide permanent magnet torque, the inherent characteristics of permanent magnets mean that the motor's excitation magnetic field is not adjustable, resulting in a very limited speed range. This speed range limitation leads to difficulties in stable speed control at high frequencies and speeds due to the high magnetic flux. Field weakening speed regulation is required to stabilize the motor's speed, but this increases operating current and reduces motor efficiency. Furthermore, field weakening increases the risk of permanent magnet demagnetization. With the increasing market demand for ultra-high-speed motors with even higher frequencies, the limitations of field weakening speed regulation mean that it cannot adequately cover higher frequencies. Therefore, motor designs must sacrifice low-frequency efficiency and reduce the permanent magnet excitation magnetic field to meet the speed regulation requirements of higher-frequency operation. Summary of the Invention

[0003] Therefore, the present invention provides a rotor assembly that can overcome the shortcomings of existing permanent magnet synchronous motors, which have limited speed range due to the inherent characteristics of the permanent magnets inside, making the motor excitation magnetic field unadjustable. Furthermore, speed regulation by field weakening through a controller can lead to increased operating current, reduced motor efficiency, and the risk of demagnetization of the permanent magnets.

[0004] To address the aforementioned problems, the present invention provides a rotor assembly, comprising: a rotor core and a position adjustment mechanism. The rotor core has magnetic poles, and a permanent magnet slot extending through the axial direction of the rotor core is constructed within each magnetic pole. A permanent magnet is assembled within the permanent magnet slot, and the permanent magnet has a first excitation magnetic field position and a second excitation magnetic field position within the permanent magnet slot. The excitation magnetic field generated by the permanent magnet at the first excitation magnetic field position is stronger than the excitation magnetic field generated by the permanent magnet at the second excitation magnetic field position. The position adjustment mechanism is capable of adjusting the switching between the first excitation magnetic field position and the second excitation magnetic field position of the permanent magnet.

[0005] In some embodiments, a permanent magnet sleeve is also included, which is hinged within the permanent magnet groove, and the permanent magnet is assembled within the permanent magnet sleeve.

[0006] In some embodiments, the permanent magnet slot is symmetrical about the d-axis with respect to the magnetic pole in which it is located, and there are two permanent magnet sleeves, which are also symmetrical about the d-axis.

[0007] In some embodiments, the permanent magnet slot has a first sidewall perpendicular to the d-axis. Within the same permanent magnet slot, when both permanent magnet sleeves are attached to the first sidewall, the included angle formed between the two permanent magnets is the first included angle. When the included angle formed between the two permanent magnets is the first included angle, it is the position of the first excitation magnetic field.

[0008] In some implementations, the first included angle is 180°.

[0009] In some embodiments, the permanent magnet slot also has a second sidewall that is symmetrical about the d-axis. In the same permanent magnet slot, when both permanent magnet sleeves are attached to the second sidewall, a second angle is formed between the two permanent magnets. The angle of the second angle is smaller than the angle of the first angle. The second angle between the two permanent magnets is the position of the second excitation magnetic field.

[0010] In some embodiments, the second sidewall is a V-shaped sidewall that is symmetrical with respect to the d-axis.

[0011] In some implementations, the second included angle is 150°.

[0012] In some embodiments, the first sidewall is located on the outer side and the second sidewall is located on the inner side along the radial direction of the rotor core.

[0013] In some embodiments, a rotating shaft is also included, on which the rotor core is mounted, and the position adjustment mechanism is disposed on the rotating shaft.

[0014] In some embodiments, the number of position adjustment mechanisms is the same as the number of magnetic poles of the rotor core.

[0015] In some embodiments, the position adjustment mechanism includes a drive assembly and a transmission assembly, the drive assembly extending outward along the outer peripheral wall of the rotating shaft, and the drive assembly being movably connected to the permanent magnet sleeve via the transmission assembly.

[0016] In some embodiments, the drive assembly includes an extension post extending outward from the outer peripheral wall of the shaft and a slider that can slide along the extension direction of the extension post. The transmission assembly is hinged to the slider, and when the slider slides along the extension post, the slider can drive the permanent magnet sleeve to rotate through the transmission assembly.

[0017] In some embodiments, the extension column has an operating cavity, the slider is installed in the operating cavity and can slide along the operating cavity, the extension column has a groove, the groove and the operating cavity both extend along the extension direction of the extension column, the operating cavity communicates with the outside through the groove, the slider has a first connecting post extending out of the groove, and the transmission assembly is hinged to the first connecting post.

[0018] In some embodiments, an elastic element is also installed in the operating cavity. The elastic element is clamped between the sliding element and a side wall of the operating cavity. The elastic element and the sliding element are arranged sequentially along the length direction of the extension column, and the sliding element is located at one end close to the rotating shaft. A venting cavity is constructed inside the rotating shaft, and the venting cavity is connected to the operating cavity. The sliding element can slide along the operating cavity under the cooperation of the gas pressure in the venting cavity and the elastic force of the elastic element.

[0019] In some embodiments, the extension post is located in the region between two adjacent permanent magnet slots.

[0020] In some embodiments, two adjacent permanent magnet sleeves located in different permanent magnet slots within two adjacent magnetic poles form a pair of linked assemblies. The transmission assembly includes two connecting rods, the first ends of which are movably connected to the two permanent magnet sleeves of the linked assembly, and the second ends of which are hinged to the first connecting post.

[0021] In some embodiments, a second connecting post is provided on the permanent magnet sleeve, and the second connecting post is hinged to the first end of the connecting rod.

[0022] In some embodiments, the slide has a first end near the rotating shaft, and when the first connecting post is located at the first end of the slide, the two permanent magnet sleeves in the same pair of linkage assemblies are respectively tightly attached to the corresponding second sidewalls.

[0023] In some embodiments, a limiting block is provided in the operating cavity, and when the first connecting post is limited to the first end of the rotating shaft, the sliding member abuts against the limiting block under the elastic force of the elastic member.

[0024] In some embodiments, the slide groove also has a second end away from the rotating shaft, and when the first connecting post is located at the second end of the slide groove, the two permanent magnet sleeves in the same pair of linkage assemblies are respectively tightly attached to the corresponding first sidewalls.

[0025] The present invention also provides an electric motor, including the rotor assembly described above.

[0026] This invention provides a rotor assembly and a motor having the same. When the position adjustment mechanism drives the permanent magnet to switch between a first excitation magnetic field position and a second excitation magnetic field position, it indicates that the magnitude of the excitation magnetic field generated by the permanent magnet is adjustable. By adjusting the position of the permanent magnet within its slot, the magnitude of the excitation magnetic field provided by the rotor is adjustable, thus solving the problem that the motor's excitation magnetic field is not adjustable due to the inherent characteristics of the permanent magnet. This eliminates the need for field weakening speed regulation via a controller, preventing issues such as increased operating current, reduced motor efficiency, and the risk of permanent magnet demagnetization. Furthermore, when designing high-frequency, ultra-high-speed motors, it is not necessary to sacrifice low-frequency efficiency or reduce the permanent magnet excitation magnetic field to meet higher frequency operating speed requirements. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the rotor assembly position adjustment mechanism in an embodiment of the present invention, which drives the two permanent magnet sleeves in the permanent magnet slot to rotate to the position of the first excitation magnetic field.

[0028] Figure 2 for Figure 1 A side view of the rotor assembly according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the rotor assembly position adjustment mechanism in an embodiment of the present invention, which drives the two permanent magnet sleeves in the permanent magnet slot to rotate to the position of the second excitation magnetic field.

[0030] Figure 4 for Figure 3 A side view of the rotor assembly according to an embodiment of the present invention;

[0031] Figure 5 This is a cross-sectional view of the rotor shaft and extension column of the rotor assembly according to an embodiment of the present invention.

[0032] Figure 6 This is a top view of the rotor shaft and extension column of the rotor assembly according to an embodiment of the present invention;

[0033] Figure 7 This is a side view of the rotor shaft and extension column of the rotor assembly according to an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the rotor assembly of the present invention, after the removal of the shaft and the extension column, showing the two permanent magnet sleeves in the permanent magnet slot at the position of the first excitation magnetic field.

[0035] Figure 9 for Figure 8 A side view of the rotor assembly according to an embodiment of the present invention;

[0036] Figure 10 for Figure 8 Rear view of the rotor assembly in an embodiment of the present invention;

[0037] Figure 11 This is a schematic diagram of the rotor assembly of the present invention, after the removal of the shaft and the extension column, showing the two permanent magnet sleeves in the permanent magnet slot at the position of the second excitation magnetic field.

[0038] Figure 12 for Figure 11 A side view of the rotor assembly according to an embodiment of the present invention;

[0039] Figure 13 for Figure 11 Rear view of the rotor assembly in an embodiment of the present invention.

[0040] The reference numerals in the attached figures are as follows:

[0041] 1. Rotor core; 2. Shaft; 3. Permanent magnet slot; 4. Permanent magnet sleeve; 5. Permanent magnet; 6. Drive assembly; 61. Extension column; 62. Operating chamber; 63. Slide groove; 64. Sliding element; 65. First connecting column; 66. Elastic element; 67. Limiting block; 68. Second connecting column; 7. Transmission assembly; 8. Ventilation chamber. Detailed Implementation

[0042] See also Figures 1 to 13 As shown, according to an embodiment of the present invention, a rotor assembly is provided, including: a rotor core 1 and a position adjustment mechanism. The rotor core 1 has magnetic poles, and permanent magnet slots 3 extending axially through the rotor core 1 are constructed within the magnetic poles. Permanent magnets 5 are assembled within the permanent magnet slots 3. The permanent magnets 5 have a first excitation magnetic field position and a second excitation magnetic field position within the permanent magnet slots 3. The excitation magnetic field generated by the permanent magnets 5 at the first excitation magnetic field position is stronger than the excitation magnetic field generated by the permanent magnets 5 at the second excitation magnetic field position. The position adjustment mechanism can adjust the switching between the first excitation magnetic field position and the second excitation magnetic field position of the permanent magnets 5. In this technical solution, when the position adjustment mechanism drives the permanent magnets 5 to switch between the first excitation magnetic field position and the second excitation magnetic field position, it indicates that the magnitude of the excitation magnetic field generated by the permanent magnets 5 is adjustable. By adjusting the position of the permanent magnets 5 within the permanent magnet slots 3, the magnitude of the excitation magnetic field provided by the rotor is adjustable, thereby solving the problem that the motor excitation magnetic field is not adjustable due to the inherent characteristics of permanent magnets. This eliminates the need for field weakening speed regulation via a controller, thus avoiding issues such as increased operating current, reduced motor efficiency, and the risk of demagnetization of the permanent magnet 5. Consequently, when designing high-frequency ultra-high-speed motors, there is no need to sacrifice low-frequency energy efficiency or reduce the permanent magnet excitation field to meet higher frequency operating speed regulation requirements.

[0043] Specifically, it also includes a permanent magnet sleeve 4, which is hinged within the permanent magnet groove 3, and the permanent magnet 5 is assembled within the permanent magnet sleeve 4. When the permanent magnet 5 changes position within the permanent magnet groove 3, it is easily damaged by impacting the side wall of the groove 3. Adding the permanent magnet sleeve 4 provides protection for the permanent magnet 5, and compared to the permanent magnet 5, the permanent magnet sleeve 4 is easier to hinge onto the side wall of the permanent magnet groove 3. At the same time, the hinged position of the permanent magnet sleeve 4 on the side wall of the permanent magnet groove 3 also facilitates the control of the position switching of the permanent magnet 5.

[0044] See also Figure 1 As shown, the permanent magnet slot 3 is symmetrical about its d-axis with respect to the magnetic pole it is located in, and there are two permanent magnet sleeves 4, which are also symmetrical about the d-axis. The presence of two permanent magnet sleeves 4 within one permanent magnet slot 3 indicates that there are two permanent magnets 5 within that slot. The symmetry of the two permanent magnet sleeves 4 with respect to the d-axis indicates that the two permanent magnets 5 are symmetrical. Combined with the symmetry of the permanent magnet slot 3 with respect to the d-axis, this makes the adjustment of the rotor's excitation magnetic field more convenient and flexible, and ensures that the magnetic field generated by the entire rotor remains uniformly distributed throughout the adjustment process.

[0045] See also Figure 1 and Figure 8 As shown, the permanent magnet slot 3 has a first sidewall perpendicular to the d-axis. In the same permanent magnet slot 3, when both permanent magnet sleeves 4 are attached to the first sidewall, the included angle formed between the two permanent magnets 5 is the first included angle. When the included angle formed between the two permanent magnets 5 is the first included angle, it is the position of the first excitation magnetic field.

[0046] In this embodiment, when the motor operates at low to medium frequencies, the excitation magnetic field generated by the two permanent magnets 5 within the same magnetic pole needs to be as large as possible to provide a larger excitation magnetic field to the rotor, thereby increasing the motor's magnetic flux density and enabling efficient motor operation. This requires the two permanent magnet sleeves 4 within the same permanent magnet slot 3 to form a large angle during rotation, and the two permanent magnet sleeves 4 need to maintain this large angle position. When the permanent magnet slot 3 has a first sidewall perpendicular to the d-axis, it effectively acts as a limiting guide. During rotation, the two permanent magnet sleeves 4 only need to adhere to the first sidewall to maximize the first angle formed between the two permanent magnets 5, and this first angle can be maintained.

[0047] Specifically, the first sidewall is a flat plane, and the surface of the first sidewall facing the permanent magnet sleeve 4 towards the permanent magnet slot 3 is also flat. This ensures that when the two permanent magnet sleeves 4 are attached to the first sidewall of the permanent magnet slot 3, the included angle between the two permanent magnet sleeves 4 is 180°, that is, the first included angle is 180°. When the first included angle is 180°, it means that the two permanent magnets 5 are arranged in a "type-1" configuration. At this time, the excitation magnetic field provided by the rotor is the strongest, which ensures that the motor has a higher magnetic flux density when running at low and medium frequencies, and the motor can operate more efficiently.

[0048] See also Figure 3 and Figure 11 As shown, the permanent magnet slot 3 also has a second sidewall that is symmetrical about the d-axis. In the same permanent magnet slot 3, when both permanent magnet sleeves 4 are attached to the second sidewall, a second angle is formed between the two permanent magnets 5. The angle of the second angle is smaller than the angle of the first angle. When the two permanent magnets 5 form the second angle, it is the position of the second excitation magnetic field.

[0049] In this embodiment, when the motor operates at high frequency, it is necessary to control the included angle between the two permanent magnet sleeves 4 within the same magnetic pole to gradually change from 180° to different included angle arrangements less than 180°. That is, the included angle between the two permanent magnets 5 needs to gradually decrease from the first included angle until it reaches the second included angle, which is a set minimum value. This reduces the excitation magnetic field, lowers the motor magnetic flux density, reduces the difficulty of motor speed adjustment, and ensures stable motor speed, thus preventing speed loss and ensuring normal operation. Consequently, field weakening control is not required, avoiding the problems of increased current and reduced efficiency caused by field weakening control. The second sidewall of the permanent magnet slot 3 has a limiting and guiding function. When both permanent magnet sleeves 4 within the permanent magnet slot 3 rotate to be in close contact with the second sidewall, it can ensure that the second included angle ultimately formed by the two permanent magnet sleeves 4 is stably maintained.

[0050] Specifically, the second sidewall is a V-shaped sidewall that is symmetrical with respect to the d-axis. This ensures that when the two permanent magnets 5 in the same permanent magnet slot 3 reach the minimum second included angle, the two permanent magnets 5 are still symmetrical with respect to the d-axis, thereby ensuring that the rotor excitation magnetic field is always uniformly distributed.

[0051] The two angles formed by the first sidewall of the permanent magnet slot 3 and the V-shaped sidewall are rounded. The permanent magnet sleeve 4 and the sidewall at these angles are hinged by spaced laminations and a shaft system. The connection part has a semi-circular structure, and the permanent magnet sleeve 4 can rotate at a small angle around this shaft system. The side of the permanent magnet sleeve 4 facing the second sidewall of the permanent magnet slot 3 is also a flat surface.

[0052] In one specific embodiment, the smaller the angle between the two permanent magnets 5 in the permanent magnet slot 3, the weaker the excitation magnetic field provided by the rotor. If the angle between the two permanent magnets 5 is too small, the magnetic utilization rate of the permanent magnets 5 will be too low. Therefore, it is necessary to limit the minimum value of the angle formed between the two permanent magnets 5. The minimum angle formed between the two permanent magnets 5 is the second angle, which is also equal to the angle between the two inclined walls of the V-shaped sidewall. Preferably, the second angle is 150°.

[0053] See also Figure 1 As shown, along the radial direction of the rotor core 1, the first sidewall is on the outer side and the second sidewall is on the inner side. This facilitates the concentration of the magnetic field generated by the two permanent magnets 5 in the permanent magnet slot 3, thereby improving motor efficiency.

[0054] Specifically, it also includes a rotating shaft 2, on which the rotor core 1 is mounted, and a position adjustment mechanism is located. The rotating shaft 2 is located at the center of the rotor core 1, and the position adjustment mechanism is located on the rotating shaft 2, which facilitates the adjustment of the position of each permanent magnet sleeve 4.

[0055] In one specific implementation, the number of position adjustment mechanisms is the same as the number of magnetic poles of the rotor core 1.

[0056] In this embodiment, since each magnetic pole of the rotor core 1 has a pair of permanent magnet sleeves 4, and each permanent magnet sleeve 4 surrounds the rotating shaft 2 once, it would be difficult to adjust the position of all permanent magnet sleeves 4 with only one position adjustment mechanism. When the number of position adjustment mechanisms is the same as the number of magnetic poles of the rotor core 1, it makes the adjustment of the position of the permanent magnet sleeves 4 more convenient and flexible.

[0057] In one specific embodiment, the position adjustment mechanism includes a drive component 6 and a transmission component 7. The drive component 6 extends outward along the outer peripheral wall of the rotating shaft 2, and the drive component 6 is movably connected to the permanent magnet sleeve 4 through the transmission component 7.

[0058] In this embodiment, since the drive assembly 6 is movably connected to the permanent magnet sleeve 4 through the transmission assembly 7, the drive assembly 6 can drive the permanent magnet sleeve 4 to rotate within the permanent magnet groove 3 with the shaft system as the fulcrum through the transmission assembly 7.

[0059] Specifically, the drive assembly 6 includes an extension column 61 extending outward from the outer peripheral wall of the rotating shaft 2 and a sliding member 64 that can slide along the extension direction of the extension column 61. The transmission assembly 7 is hinged to the sliding member 64. When the sliding member 64 slides along the extension column 61, the sliding member 64 can drive the permanent magnet sleeve 4 to rotate through the transmission assembly 7.

[0060] In this embodiment, when the sliding member 64 slides along the extension direction of the extension column 61, the sliding member 64 will drive the transmission component 7 to move. During the movement, the transmission component 7 will drive the corresponding permanent magnet sleeve 4 to rotate in the permanent magnet slot 3 with the shaft system as the fulcrum, thereby adjusting the angle between the two permanent magnet sleeves 4 in the permanent magnet slot 3. Finally, the arrangement of the two permanent magnets in the permanent magnet slot 3 will change between the maximum value "Type I" and the minimum set value "Type V", thereby achieving the purpose of adjusting the excitation magnetic field of the motor.

[0061] See also Figure 5 As shown, the extension column 61 has an operating cavity 62. The sliding member 64 is installed in the operating cavity 62 and can slide along the operating cavity 62. The extension column 61 has a sliding groove 63. The sliding groove 63 and the operating cavity 62 both extend along the extension direction of the extension column 61. The operating cavity 62 communicates with the outside through the sliding groove 63. The sliding member 64 has a first connecting post 65 extending out of the sliding groove 63. The transmission assembly 7 is hinged to the first connecting post 65.

[0062] In this embodiment, the structure of the operating cavity 62 provides convenient space for the installation of the slider 64, and also makes the slider 64 relatively stable when sliding. When each slider 64 slides in the corresponding operating cavity 62, the first connecting post 65 of each slider 64 will also slide along the corresponding slide groove 63, and each first connecting post 65 drives each transmission component 7 to move during the movement.

[0063] See also Figure 5 As shown, an elastic element 66 is also installed in the operating cavity 62. The elastic element 66 is clamped between the sliding element 64 and one side wall of the operating cavity 62. The elastic element 66 and the sliding element 64 are arranged sequentially along the length direction of the extension column 61, and the sliding element 64 is located at one end close to the rotating shaft 2. A venting cavity 8 is constructed in the rotating shaft 2. The venting cavity 8 is connected to the operating cavity 62. The sliding element 64 can slide along the operating cavity 62 under the cooperation of the gas pressure in the venting cavity 8 and the elastic force of the elastic element 66.

[0064] In this embodiment, a ventilation chamber 8 is constructed within the rotating shaft 2, and an external air supply device supplies air and regulates the air pressure in the ventilation chamber 8. The air pressure regulation system is jointly controlled with the motor controller. When the motor is running at low to medium frequencies, the air pressure supplied by the external air supply device is at its maximum. The air pressure pushes each sliding member 64 to slide along each operating chamber 62 and squeezes each elastic member 66. Each first connecting column 65 drives each transmission component 7 to move, causing the two permanent magnets 5 in each permanent magnet slot 3 to rotate to a "type-1" arrangement. The rotor provides the maximum excitation magnetic field, improves the motor's magnetic flux density, and enables the motor to operate efficiently. As the motor's operating frequency gradually increases and the control air pressure gradually decreases, the compressed elastic elements 66 release their elasticity. Each elastic element 66 pushes the sliding elements 64 back along the operating chambers 62, causing each first connecting post 65 to move the transmission components 7. This changes the arrangement of the two permanent magnets 5 in each permanent magnet slot 3 from a single-type arrangement to a V-shaped arrangement with different angles. At this time, the excitation magnetic field provided by the rotor decreases as the angle decreases. When the air pressure is zero, each sliding element 64 returns to its initial position. At this time, the angle between the two permanent magnets 5 in each permanent magnet slot 3 reaches its minimum value, and the excitation magnetic field provided by the rotor is at its minimum. By adjusting the position of the permanent magnets 5, the excitation magnetic field of the motor can be adjusted, and the magnitude of the excitation magnetic field can be controlled as needed to expand the speed regulation range.

[0065] Specifically, the extension post 61 is located in the area between two adjacent permanent magnet slots 3. The rotor core 1 of this application has four magnetic poles, and there are four outwardly extending extension posts 61 on the rotating shaft 2. The four extension posts 61 are evenly distributed along the circumference of the rotating shaft 2, and the location of each extension post 61 is in the area between two adjacent permanent magnet slots 3. Because the area between two adjacent permanent magnet slots 3 is an unused area, the effective space utilization here is larger, so this position of the extension post 61 is a better choice.

[0066] See also Figure 1 As shown, two adjacent permanent magnet sleeves 4 located in different permanent magnet slots 3 within two adjacent magnetic poles form a linked assembly. The transmission component 7 includes two connecting rods. The first ends of the two connecting rods are movably connected to the two permanent magnet sleeves 4 of the linked assembly, and the second ends of the two connecting rods are hinged to the first connecting post 65. When the sliding member 64 slides along the operating cavity 62 to drive the two connecting rods to move, the two connecting rods will respectively drive the permanent magnet sleeves 4 movably connected to them to rotate at a small angle around the axis system. When the transmission component 7 consists of two connecting rods, the structure is simple and the installation is convenient.

[0067] See also Figure 2 As shown, a second connecting post 68 is provided on the permanent magnet sleeve 4, and the second connecting post 68 is hinged to the first end of the connecting rod. The second connecting post 68 on the permanent magnet sleeve 4 makes the connection between the permanent magnet sleeve 4 and the connecting rod more convenient.

[0068] In one specific embodiment, the slide 63 has a first end close to the rotating shaft 2. When the first connecting post 65 is limited to the first end of the slide 63, the two permanent magnet sleeves 4 in the same pair of linkage assemblies are respectively tightly attached to the corresponding second side wall.

[0069] In this embodiment, when the sliding member 64 causes the first connecting post 65 to be limited to the first end of the slide groove 63 under the elastic force of the elastic member 66, that is, when the sliding member 64 is in the initial position, the two permanent magnet sleeves 4 in the linkage assembly body connected by the first connecting post 65 through the transmission assembly 7 are also tightly attached to the corresponding second side wall. This ensures that the transmission assembly 7 is in a stress-free state in this state, thereby extending the service life of the transmission assembly 7.

[0070] See also Figure 5 As shown, a limiting block 67 is provided in the operating cavity 62. When the first connecting post 65 is limited to the first end of the rotating shaft 2, the sliding member 64 abuts against the limiting block 67 under the elastic force of the elastic member 66.

[0071] In this embodiment, when the slider 64 is in its initial position, that is, when the slider 64, under the elastic force of the elastic member 66, limits the first connecting post 65 to the first end of the slide groove 63, only the first connecting post 65 is against the first end of the slide groove 63 to resist the elastic force of the elastic member 66. Due to stress concentration, the first connecting post 65 is easily damaged, and the entire slider 64 is subjected to uneven force. Therefore, a limiting block 67 needs to be provided in the operating cavity 62. When the slider 64 is in its initial position, the slider 64 abutting against the limiting block 67 can effectively distribute the pressure borne by the first connecting post 65, and also make the entire slider 64 subjected to more even force.

[0072] In one specific embodiment, the slide 63 also has a second end away from the rotating shaft 2. When the first connecting post 65 is limited to the second end of the slide 63, the two permanent magnet sleeves 4 in the same pair of linkage assemblies are respectively tightly attached to the corresponding first side wall.

[0073] In this embodiment, when the gas pressure in the venting chamber 8 is at its maximum, the sliding member 64 moves under the action of the gas pressure and squeezes the elastic member 66 until the first connecting post 65 on the sliding member 64 is limited to the second end of the sliding groove 63, at which point the sliding member 64 stops moving. At this time, the two permanent magnet sleeves 4 in the linkage assembly body that are movably connected to the first connecting post 65 through the transmission assembly 7 are also tightly attached to the corresponding first sidewalls. This ensures that the transmission assembly 7 is also in a stress-free state in this state, thereby further extending the service life of the transmission assembly 7.

[0074] The present invention also provides an electric motor, including the rotor assembly described above.

[0075] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0076] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that, The device includes a rotor core (1) and a position adjustment mechanism. The rotor core (1) has magnetic poles, and a permanent magnet slot (3) is constructed inside the magnetic poles, penetrating the axial direction of the rotor core (1). A permanent magnet (5) is assembled in the permanent magnet slot (3). The permanent magnet (5) has a first excitation magnetic field position and a second excitation magnetic field position in the permanent magnet slot (3). The excitation magnetic field generated by the permanent magnet (5) at the first excitation magnetic field position is stronger than the excitation magnetic field generated by the permanent magnet (5) at the second excitation magnetic field position. The position adjustment mechanism can adjust the switching between the first excitation magnetic field position and the second excitation magnetic field position of the permanent magnet (5). It also includes a permanent magnet sleeve (4) and a rotating shaft (2). The permanent magnet sleeve (4) is hinged in the permanent magnet groove (3). The permanent magnet (5) is assembled in the permanent magnet sleeve (4). The rotor core (1) is fitted on the rotating shaft (2). The position adjustment mechanism is set on the rotating shaft (2). The position adjustment mechanism includes a drive assembly (6) and a transmission assembly (7). The drive assembly (6) extends outward along the outer peripheral wall of the rotating shaft (2). The drive assembly (6) is movably connected to the permanent magnet sleeve (4) through the transmission assembly (7). The drive assembly (6) includes an extension column (61) extending outward from the outer peripheral wall of the rotating shaft (2) and a sliding member (64) that can slide along the extension direction of the extension column (61). The transmission assembly (7) is hinged to the sliding member (64). When the sliding member (64) slides along the extension column (61), the sliding member (64) can drive the permanent magnet sleeve (4) to rotate through the transmission assembly (7). The extension column (61) has an operating cavity (62) inside. The sliding member (64) is installed in the operating cavity (62) and can slide along the operating cavity (62). The extension column (61) has a sliding groove (63). The sliding groove (63) and the operating cavity (62) both extend along the extension direction of the extension column (61). The operating cavity (62) communicates with the outside through the sliding groove (63). The sliding member (64) has a first connecting post (65) extending out of the sliding groove (63). The transmission assembly (7) is hinged to the first connecting post (65). Within two adjacent magnetic poles, two adjacent permanent magnet sleeves (4) located in different permanent magnet slots (3) form a pair of linked assemblies. The transmission assembly (7) includes two connecting rods. The first ends of the two connecting rods are movably connected to the two permanent magnet sleeves (4) of the linked assembly, and the second ends of the two connecting rods are hinged to the first connecting column (65).

2. The rotor assembly according to claim 1, characterized in that, The permanent magnet slot (3) is symmetrical about the d-axis with respect to the magnetic pole it is located in, and there are two permanent magnet sleeves (4), which are also symmetrical about the d-axis.

3. The rotor assembly according to claim 2, characterized in that, The permanent magnet slot (3) has a first sidewall perpendicular to the d-axis. In the same permanent magnet slot (3), when both permanent magnet sleeves (4) are attached to the first sidewall, the included angle formed between the two permanent magnets (5) is the first included angle. When the included angle formed between the two permanent magnets (5) is the first included angle, it is the position of the first excitation magnetic field.

4. The rotor assembly according to claim 3, characterized in that, The first included angle is 180°.

5. The rotor assembly according to claim 3, characterized in that, The permanent magnet slot (3) also has a second sidewall that is symmetrical about the d-axis. In the same permanent magnet slot (3), when both permanent magnet sleeves (4) are attached to the second sidewall, a second angle is formed between the two permanent magnets (5). The angle of the second angle is smaller than the angle of the first angle. When the two permanent magnets (5) form the second angle, it is the position of the second excitation magnetic field.

6. The rotor assembly according to claim 5, characterized in that, The second sidewall is a V-shaped sidewall that is symmetrical with respect to the d-axis.

7. The rotor assembly according to claim 5, characterized in that, The second included angle is 150°.

8. The rotor assembly according to claim 5, characterized in that, Along the radial direction of the rotor core (1), the first sidewall is on the outer side and the second sidewall is on the inner side.

9. The rotor assembly according to claim 1, characterized in that, The number of position adjustment mechanisms is the same as the number of magnetic poles of the rotor core (1).

10. The rotor assembly according to claim 1, characterized in that, An elastic element (66) is also installed in the operating cavity (62). The elastic element (66) is clamped between the sliding element (64) and one side wall of the operating cavity (62). The elastic element (66) and the sliding element (64) are arranged sequentially along the length direction of the extension column (61), and the sliding element (64) is located at one end close to the rotating shaft (2). A ventilation cavity (8) is constructed in the rotating shaft (2). The ventilation cavity (8) is connected to the operating cavity (62). The sliding element (64) can slide along the operating cavity (62) under the cooperation of the gas pressure in the ventilation cavity (8) and the elastic force of the elastic element (66).

11. The rotor assembly according to claim 1, characterized in that, The extension column (61) is located in the area between two adjacent permanent magnet slots (3).

12. The rotor assembly according to claim 1, characterized in that, The permanent magnet sleeve (4) is provided with a second connecting post (68), which is hinged to the first end of the connecting rod.

13. The rotor assembly according to claim 5, characterized in that, The slide (63) has a first end close to the rotating shaft (2). When the first connecting post (65) is located at the first end of the slide (63), the two permanent magnet sleeves (4) in the same pair of linkage assemblies are respectively tightly attached to the corresponding second side wall.

14. The rotor assembly according to claim 10, characterized in that, A limiting block (67) is provided in the operating cavity (62). When the first connecting column (65) is limited to the first end of the rotating shaft (2), the sliding member (64) abuts against the limiting block (67) under the elastic force of the elastic member (66).

15. The rotor assembly according to claim 3, characterized in that, The slide (63) also has a second end away from the rotating shaft (2). When the first connecting column (65) is located at the second end of the slide (63), the two permanent magnet sleeves (4) in the same pair of linkage assemblies are respectively tightly attached to the corresponding first sidewall.

16. An electric motor, characterized in that, The rotor assembly includes any one of claims 1 to 15.

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