Traction machine rotor, traction machine, elevator

Abstract

This invention discloses a rotor for a traction machine, a traction machine, and an elevator. The rotor includes: a rotor core, which is cylindrical, with multiple spaced magnetic slots on its outer circumferential surface. Each magnetic slot is axially continuous on the rotor core, and the portion between two adjacent magnetic slots is a radial shoulder; and multiple permanent magnets, which are correspondingly arranged in the multiple magnetic slots. The number of permanent magnets is 2n, where n is an integer and n≥2, and satisfies shape relationships (1) and (2). Satisfying relationship (1) ensures that the traction machine can maximize its output under the same material conditions, thereby reducing manufacturing costs. Satisfying relationship (2) results in a better sinusoidal waveform of the air gap back electromotive force, thereby reducing the torque pulsation rate and cogging torque of the traction machine. When this traction machine is applied to an elevator, it is beneficial for the elevator to operate in an ultra-quiet state.

Description

Technical Field

[0001] This invention relates to the field of traction machines, and more specifically to the rotor of a traction machine, the traction machine itself, and elevators. Background Technology

[0002] As people increasingly pursue a higher quality of life, home elevators are becoming the choice of more and more families. Given the unique operating environment of home elevators, the noise level and sound quality generated during operation have become key factors for customers when making a purchase decision.

[0003] As the green development strategy continues to deepen and advance, permanent magnet synchronous motors (including permanent magnet auxiliary synchronous motors) have gradually replaced traditional three-phase asynchronous motors due to their high efficiency and high power factor. However, the continuous rise in raw material prices in recent years has led to a year-on-year increase in the production, manufacturing, and management costs of permanent magnet synchronous motors. Therefore, how to reduce the production and manufacturing costs of permanent magnet synchronous motors while simultaneously reducing the noise of traction machines in home elevators has become a major challenge for the industry. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a rotor for a traction machine, a traction machine, and an elevator, which effectively controls the production cost of the traction machine rotor and effectively reduces operating noise.

[0005] The rotor of the traction machine according to an embodiment of the present invention includes: a rotor core, wherein a plurality of magnet slots are provided at intervals on the outer circumferential surface of the rotor core, and the portion between two adjacent magnet slots is a radial shoulder; a plurality of permanent magnets, wherein the plurality of permanent magnets are disposed one-to-one in the plurality of magnet slots, the number of the permanent magnets is 2n, where n is an integer and n≥2, and satisfies the following relationship:

[0006]

[0007]

[0008] Where f is the rated electrical frequency of the traction machine, N is the number of turns in series in one phase of the traction machine, and B r U0 represents the residual magnetism of the permanent magnet, and U0 represents the effective value of the inverter output line voltage of the traction machine.

[0009] Each of the permanent magnets is an arc-shaped tile. The permanent magnet includes a first surface and a second surface that are arranged radially opposite to each other along the rotor core. The second surface is adjacent to the axis of the rotor. R1 is the radius of the first surface, R2 is the radius of the second surface, a1 is the central angle occupied by the magnet slot on the rotor, a2 = 180° / n, and the number of permanent magnets is 2n.

[0010] The permanent magnets are symmetrically arranged relative to the radial mid-plane, which passes through the axis of the rotor;

[0011] The permanent magnet also includes two magnet sides, which are located on both sides of the permanent magnet in the circumferential direction. The intersection line between the magnet sides and the second surface is an inner intersection line, and the reference surface passing through the inner intersection line and parallel to the radial mid-plane is a side reference surface.

[0012] The first surface is smaller than the second surface. The area enclosed by the side surface of the magnet, the side reference surface and the cylindrical surface where the first surface is located is a sector area. The central angle of the sector area is b. S1 is the projected area of ​​the sector area on the vertical plane of the axis. S2 is the projected area of ​​the permanent magnet on the vertical plane of the axis. The vertical plane of the axis is a plane perpendicular to the axis of the rotor.

[0013] The radial shoulder includes a shoulder circumferential surface and two shoulder side surfaces on both sides in the circumferential direction, and the radius of the shoulder circumferential surface is R3.

[0014] Optionally, the side of the magnet is connected to the second surface by a first fillet.

[0015] According to an embodiment of the present invention, the rotor of the traction machine, by satisfying the relationship (1) in its structure, ensures that the output of the traction machine is maximized under the same material conditions, thereby saving the electrical energy consumption of the traction machine. Under the same output conditions, it is beneficial to reduce the material of the traction machine, thereby reducing manufacturing costs. By satisfying the relationship (2), the sinusoidal nature of the air gap back electromotive force waveform is improved, thereby reducing the torque pulsation rate and cogging torque of the traction machine. When this traction machine is applied to an elevator, it is beneficial for the elevator to operate in an ultra-quiet state.

[0016] Optionally, the side of the shoulder is connected to the bottom surface of the magnet groove by a second rounded corner, the radius of which is smaller than the radius of the first rounded corner.

[0017] Optionally, the shoulder side is in contact with the magnet side.

[0018] Optionally, the permanent magnet is fixed to the rotor core by adhesive.

[0019] Optionally, the rotor core is formed by stacking multiple rotor laminations axially.

[0020] Optionally, the radial shoulder has a chamfer at the connection between the shoulder circumference and the shoulder side surface, and a chamfer at the connection between the shoulder side surface and the bottom surface of the magnet groove, and the chamfer radius is in the range of 0.3mm to 0.8mm.

[0021] In some embodiments, the rotor further includes baffles that cooperate with both sides of the rotor core, with the two baffles blocking the axial ends of the permanent magnet.

[0022] Specifically, the rotor core is provided with a plurality of axially penetrating connecting holes, and the rotor is provided at the plurality of connecting holes by a plurality of fasteners, with the two ends of each fastener connected to the baffles on both sides.

[0023] According to an embodiment of the present invention, a traction machine includes a stator and a rotor that cooperates with the stator, wherein the rotor is the rotor of the aforementioned traction machine. By configuring the rotor and satisfying the structural parameter relationship between the permanent magnets and radial shoulders on the rotor, it is beneficial to reduce costs while improving the sinusoidal nature of the air gap back EMF waveform, thereby reducing the torque ripple rate and cogging torque of the traction machine. When this traction machine is applied to an elevator, it helps the elevator operate in an ultra-quiet state.

[0024] An elevator according to an embodiment of the present invention includes the aforementioned traction machine. By configuring the rotor and satisfying the structural parameter relationship between the permanent magnets and radial shoulders on the rotor, it is beneficial to reduce costs while improving the sinusoidal nature of the air gap back electromotive force waveform, thereby reducing the torque ripple rate and cogging torque of the traction machine. When this traction machine is applied to an elevator, it helps the elevator operate in an ultra-quiet state.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is a front view of the rotor of an embodiment of the present invention, including the rotor core and the permanent magnet;

[0028] Figure 2 These are partial schematic diagrams of the mating points between the rotor core and the permanent magnet in some embodiments;

[0029] Figure 3 These are front views of the permanent magnets in some embodiments;

[0030] Figure 4 These are perspective views of the rotor in some embodiments;

[0031] Figure 5 yes Figure 4 An exploded view of the rotor in the illustrated embodiment.

[0032] Figure label:

[0033] Rotor 1;

[0034] The axis of the shaft is L1, the lateral reference plane is F1, the radial midline is F3, and the inner intersection line is L2;

[0035] Rotor core 11, connecting hole 111, shaft hole 112, magnet slot 113, bottom surface of magnet slot 1131, radial shoulder 114, shoulder circumferential surface 1141, shoulder side surface 1142, second fillet 1145;

[0036] Permanent magnet 12, first surface 121, second surface 122, magnet side surface 123, first rounded corner 125;

[0037] 13. Baffle plate 14. Fastener 14. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of this invention, it should be understood that the terms "center," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] The rotor 1 of the traction machine according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0042] The rotor 1 of the traction machine according to an embodiment of the present invention includes: a rotor core 11 and a plurality of permanent magnets 12.

[0043] The outer circumferential surface of the rotor core 11 is provided with a plurality of spaced magnetic slots 113, and the portion between two adjacent magnetic slots 113 is a radial shoulder 114. That is, the rotor core 11 is cylindrical, and each magnetic slot 113 is axially continuous on the rotor core 11, with each magnetic slot 113 being open on the side away from the axis L1 of the rotor core 11. A plurality of permanent magnets 12 are correspondingly arranged in the plurality of magnetic slots 113, and the number of permanent magnets 12 is even, that is, 2n, where n is an integer and n≥2.

[0044] The rotor 1 of this application satisfies the following relationship:

[0045]

[0046]

[0047] Where f is the rated electrical frequency of the traction machine, N is the number of turns in series in one phase of the traction machine, Br is the remanence of the permanent magnet 12, and U0 is the effective value of the output line voltage of the traction machine's frequency converter. Here, f, N, Br, and U0 are all technical parameters that can be determined after selecting the required line load and magnetic load according to the technical requirements of the traction machine. The methods for determining these parameters are known in the art and will not be elaborated here. Except for the parameters in the above formulas (1) and (2), all other parameters are determined by the structure of the rotor 1. The relationship between these structural parameters is the core of the design of this application.

[0048] Specifically, such as Figure 2 and Figure 3 As shown, each permanent magnet 12 is an arc-shaped tile. Each permanent magnet 12 includes a first surface 121 and a second surface 122 arranged radially opposite to each other along the rotor core 11. The second surface 122 is adjacent to the axis L1 of the rotor 1. R1 is the radius of the first surface 121, R2 is the radius of the second surface 122, a1 is the central angle occupied by the magnet slot 113 on the rotor 1, and a2 = 180° / n. Here, the first surface 121 and the second surface 122 are coaxially arranged.

[0049] The radial shoulder 114 includes a shoulder circumferential surface 1141 and two shoulder side surfaces 1142 on both sides of the circumference. The radius of the shoulder circumferential surface 1141 is R3. Here, the shoulder circumferential surface 1141 is the part on the outer circumference of the rotor 11 located between two adjacent magnet slots 113, so the radius of the shoulder circumferential surface 1141 is also the outer diameter of the rotor core 11.

[0050] Here, the settings for R1, R2, and R3 can be determined based on the installation space of rotor 1.

[0051] The permanent magnet 12 is symmetrically arranged with respect to the radial mid-plane F3, which passes through the axis L1 of the rotor 1.

[0052] The permanent magnet 12 also includes two magnet side surfaces 123, which are located on both sides of the permanent magnet 12 in the circumferential direction. The intersection line between the magnet side surfaces 123 and the second surface 122 is called the inner intersection line L2. The reference surface passing through the inner intersection line L2 and parallel to the radial mid-plane F3 is called the lateral reference surface F1. Here, the inner intersection line L2 is a reference line introduced to describe the lateral reference surface F1 and the sector region mentioned below.

[0053] The first surface 121 is smaller than the second surface 122. The area enclosed by the side surface 123 of the magnet, the side reference surface F1 and the cylindrical surface where the first surface 121 is located is a sector area with a central angle of b. S1 is the projected area of ​​the sector area on the vertical plane of the axis, and S2 is the projected area of ​​the permanent magnet 12 on the vertical plane of the axis. The vertical plane of the axis is a plane perpendicular to the axis L1 of the rotor 1.

[0054] It is understandable that multiple magnet slots 113 are evenly spaced circumferentially on the outer periphery of the rotor core 11, and similarly, multiple radial shoulders 114 are evenly spaced circumferentially on the rotor core 11. Likewise, multiple permanent magnets 12 are also evenly spaced circumferentially on the rotor core 11. The rotor 1 uses tile-shaped permanent magnets 12, which fit onto the outer periphery of the rotor core 11. Radial shoulders 114 can be used for radial positioning, ensuring that the permanent magnets 12 rotate synchronously with the rotor core 11. Since there are 2n permanent magnets 12, there are also 2n magnet slots 113 and 2n radial shoulders 114; the number of all three is consistent.

[0055] This configuration improves the dynamic balance accuracy of rotor 1. Dynamic balance is one of the key parameters of the mechanical performance of rotating rotor 1. To improve the balance accuracy of the rotating body, the goal is to make the center of gravity of rotor 1 coincide with the axis L1 of shaft 1, reducing bending and twisting. The permanent magnet 12 adopts a tile-like structure, which can better adapt to the outer circumferential shape of rotor 1 and improve dynamic balance accuracy. In addition, the tile-like structure can also improve the stability and reliability of permanent magnet 12, ensuring the stable operation of rotor 1.

[0056] The above-mentioned relationship (1) of rotor 1 in this application is the optimal selection expression for the inner and outer diameters of the permanent magnet. The inner and outer diameters of the permanent magnet refer to the radius R1 of the first surface 121 and the radius R2 of the second surface 122. Satisfying relationship (1) can ensure that the output of the traction machine is maximized as much as possible under the same material, which is conducive to obtaining higher traction machine power.

[0057] The aforementioned relationship (2) of the rotor 1 in this application describes the shape expression of the permanent magnet 12 and the radial shoulder 114. This shape of the permanent magnet 12 ensures the sinusoidal nature of the air gap back EMF waveform, and the shape of the radial shoulder 114 ensures that there is some leakage flux at the two edges of the permanent magnet 12, thereby improving the sinusoidal nature of the air gap back EMF waveform and reducing the torque pulsation rate and cogging torque of the traction machine. This reduces the operating noise of the traction machine, and when such a traction machine is applied to an elevator, it helps the elevator operate in an ultra-quiet state. In some designs, the noise generated during the operation of this elevator does not exceed 48 decibels (i.e., <48 dB).

[0058] Of course, by adopting the above relationships and selecting suitable line and magnetic loads according to the technical requirements of the traction machine, and determining the rated electrical frequency f, the number of series turns N in one phase of the traction machine, the remanence Br of the permanent magnet 12, and the effective value U0 of the inverter output line voltage of the traction machine, parametric modeling can be performed. The finite element method can then be used for selection. The selection criteria are the current magnitude, torque ripple rate, and cogging torque under the same output torque; naturally, the lower these criteria are, the better. Based on the final parameters obtained from the selection, prototype manufacturing can be carried out.

[0059] Specifically, the outer contour of the rotor core 11 is circular or approximately circular, which can match the circular contour of the stator of the traction machine, thereby reducing the air resistance when the rotor 1 of the traction machine rotates and helping to reduce the wind friction loss of the traction machine.

[0060] Optionally, b can be 10°, 11°, 12°, 14°, 15°, 16°, 18°, 19°, 20°, 21°, etc.

[0061] Optionally, the permanent magnet 12 can be magnetized radially, which can increase the magnetic density of the permanent magnet 12, improve the traction machine's resistance to demagnetization, and thus improve the efficiency and performance of the traction machine.

[0062] Specifically, the first surface 121 and the second surface 122 of the permanent magnet 12 are both arc-shaped. Further, the cylindrical surfaces containing the first surface 121 and the second surface 122 are coaxially arranged. Optionally, the axes of the cylindrical surfaces containing the first surface 121 and the second surface 122 are coaxially arranged with the axis L1 of the shaft 1, and all permanent magnets 12 are positioned on the rotor 1 with equal radii, thereby further improving the dynamic balance of the rotor 1 during rotation.

[0063] Optionally, such as Figure 2As shown, the magnet side surface 123 and the second surface 122 are connected by a first fillet 125. The first fillet 125 is designed to prevent excessive stress concentration at the connection between the magnet side surface 123 and the second surface 122, reducing the likelihood of this area becoming a sharp corner and causing damage to the rotor core 11 during assembly. Especially during operation, the rotor core 11 drives the permanent magnet 12 to rotate, and a large pressure is generated between the circumferential ends of the permanent magnet 12 and the rotor core 11. This pressure acts on the magnet side surface 123. Therefore, the inner end of the magnet side surface 123 is formed with a first fillet 125 to prevent this pressure from concentrating at the inner end of the magnet side surface 123 and causing it to be crushed and deformed, and to prevent the inner end of the magnet side surface 123 from being crushed and producing debris that would affect the movement of the entire machine.

[0064] Optionally, such as Figure 2 As shown, the shoulder side 1142 and the bottom surface 1131 of the magnet groove 113 are connected by a second fillet 1145, the radius of which is smaller than the radius of the first fillet 125. This creates a certain gap between the first fillet 125 and the second fillet 1145, which serves as a buffer gap during assembly. The design of the first fillet 125 and the second fillet 1145 prevents the inner ends of the magnet side 123 and the shoulder side 1142 from forming sharp corners, avoiding the possibility of sharp corners colliding and causing excessive assembly resistance, thus reducing assembly difficulty.

[0065] In addition, rounding the inner end of the shoulder side 1142 can reduce the difficulty of machining the surface precision of the inner surface of the magnet groove 113, especially at the corners to avoid sharp corners that may cause thorns, debris, etc.

[0066] Furthermore, such as Figure 2 As shown, chamfers are provided at the connection between the shoulder perimeter 1141 and the shoulder side surface 1142 on both sides of the radial shoulder 114. At the same time, chamfers are also provided at the connection between the shoulder side surface 1142 and the bottom surface 1131 of the magnet slot 113. That is to say, all four sharp corners of the radial shoulder 114 are chamfered, which can avoid the problem of shortened service life of the rotor core 11 due to local stress concentration during the rotation of the rotor 1.

[0067] Optionally, the chamfer radius at the four corners of the radial shoulder 114 ranges from 0.3mm to 0.8mm, meaning that the radius of each chamfer is not less than 0.3mm and not more than 0.8mm. This limits the chamfer radius to a reasonable range, avoiding both excessively small chamfers that would have insufficient stress-reducing effect and excessively large chamfers that would result in excessive air gaps.

[0068] In some specific embodiments, such as Figure 2As shown, the shoulder side 1142 is in contact with the magnet side 123. That is, a surface contact is formed between the two. By increasing the contact area, the stress concentration at the contact position is further reduced. Moreover, during assembly, the shoulder side 1142 can guide the permanent magnet 12, improving the ease of assembly.

[0069] Optionally, the permanent magnet 12 is fixed to the rotor core 11 by adhesive bonding. The main advantages of adhesive bonding are simple processing, reliability, and low cost. As a relatively simple connection method, no special tools or processes are required; simply apply adhesive to the permanent magnet 12 or the rotor core 11, assemble, and wait for the adhesive to dry. Furthermore, the adhesive for permanent magnets has high bonding strength and stability, allowing the permanent magnet 12 to maintain its position and magnetism for a long time.

[0070] In this application, the processing method of the rotor core 11 is not limited. For example, in some specific embodiments, the rotor core 11 is formed by stacking multiple rotor laminations axially. This simplifies the manufacturing process, reduces manufacturing costs, and especially saves raw materials. This processing method also saves manufacturing time, reduces the spoilage rate, and improves economic efficiency.

[0071] In some other embodiments, the rotor core 11 can also be integrally machined from a magnetic conductor. Integrating the magnetic conductor into a single piece reduces the rotor's size and increases the traction machine's power density. It allows for higher magnetic flux and lower eddy current losses, improving the traction machine's efficiency and power output. Furthermore, the controllable gap size on the rotor core 11 helps improve the stability and reliability of the rotor 1.

[0072] In some embodiments, such as Figure 4 and Figure 5 As shown, the rotor 1 also includes baffles 13 that fit on both axial sides of the rotor core 11, with the two baffles 13 blocking the axial ends of the permanent magnet 12. This prevents the permanent magnet 12 from moving axially.

[0073] Specifically, the rotor core 11 is provided with multiple axially penetrating connecting holes 111, and the rotor 1 is inserted through multiple fasteners 14 at the multiple connecting holes 111. The two ends of each fastener 14 are connected to the two side baffles 13.

[0074] In some specific examples, one baffle 13 has m through holes and another baffle 13 has m threaded holes. After the permanent magnet 12 is loaded onto the rotor core 11, a fastener 14 (such as a screw) can be used to first pass through the baffle 13, then through the m connecting holes 111 on the rotor core 11, and then threaded onto the threaded hole of the other baffle 13 to lock the rotor core 11 and the baffle 13 together, ensuring the stability of the traction machine during operation.

[0075] In some embodiments, the rotor core 11 is provided with a shaft hole 112, and the shaft of the traction machine is fitted into the shaft hole 112 of the rotor core 11. Optionally, the shaft of the traction machine is fitted into the shaft hole 112 of the rotor core 11 in a transition fit, and the shaft of the traction machine can also be connected by a keyway in the shaft hole 112 of the rotor core 11.

[0076] In this application, after selecting the structural parameters of the rotor core 11 and the permanent magnet 12, a prototype was manufactured.

[0077] After prototyping all the parts of rotor 1, the materials need to be checked and oil stains removed from their surfaces before assembly. Then, apply an appropriate amount of permanent magnet adhesive between the two radial shoulders 114, and install the permanent magnets 12 sequentially. After the permanent magnets 12 are installed, the distribution of each magnetic pole of rotor 1 needs to be checked again; if it passes inspection, the installation of permanent magnets 12 on rotor 1 is complete. Then, use screws (as fasteners 14) to lock the two axial baffles 13 (apply threadlocker to the screw threads). This completes the design and manufacturing of rotor 1.

[0078] According to an embodiment of the present invention, the traction machine includes a stator and a rotor 1 that cooperates with the stator. The rotor 1 is the rotor 1 of the traction machine described in the above embodiment. The structure of the rotor 1 will not be described in detail here.

[0079] Specifically, the stator is provided with stator windings, and the rotating magnetic field generated by the energized coils (that is, the stator windings) acts on the rotor 1 to form a magnetoelectric rotational torque, thereby driving the rotor 1 to rotate.

[0080] By configuring rotor 1 as described above, the output of the traction machine can be maximized under the same material conditions, which is beneficial for obtaining higher traction machine power. This also results in a more sinusoidal air gap back EMF waveform, reducing the torque ripple rate and cogging torque of the traction machine. Consequently, the operating noise of the traction machine can be reduced, and when this type of traction machine is applied to elevators, it helps the elevator operate in an ultra-quiet state.

[0081] The traction machine according to the embodiments of the present invention is not limited to any particular field of application and can be used as a drive device for vertical or inclined transportation equipment such as elevators and escalators.

[0082] The elevator according to an embodiment of the present invention, including the above-described traction machine, is advantageous for operating in an ultra-quiet state.

[0083] Specifically, the elevator includes a traction machine and an elevator car. The traction machine is connected to the elevator car via a traction rope. The traction machine includes a drive sheave, a rotating frame, a rotor, a base, a stator, a shaft, a brake disc, and a braking device. The braking device includes a fixed iron core, a movable armature, an electromagnetic coil, a spring, and a mounting shaft. The base includes a stator mounting portion, a shaft support portion, a braking device mounting portion, and a braking surface. To simplify the structure, in this embodiment, the braking surface and the braking device mounting portion are of the same structure, accommodating the braking device, the brake disc, the braking device mounting portion, and the cavity of the braking surface. The rotating frame includes a rotor mounting portion, a drive sheave mounting portion, and a gear. The gear is located radially outside the rotor mounting portion. The shaft is fixedly connected to the rotating frame. The shaft is rotatably connected to the shaft support portion via bearings and bearings. The brake disc is axially movable to the shaft, allowing axial movement on the shaft. Simultaneously, the braking friction force generated by the braking device is transmitted to the shaft through the connected brake disc.

[0084] Other components of the traction machine according to embodiments of the present invention, such as the stator and traction rope, are known in their structure and principle to those skilled in the art and will not be described in detail here.

[0085] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0086] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotor for a traction machine, characterized in that, include: The rotor core has a plurality of spaced magnetic slots on its outer circumferential surface, and the portion between two adjacent magnetic slots is a radial shoulder. Multiple permanent magnets are respectively disposed in multiple magnet slots, wherein the number of permanent magnets is even and satisfies the following conditions: Where f is the rated electrical frequency of the traction machine, N is the number of turns in series in one phase of the traction machine, and B r U0 represents the residual magnetism of the permanent magnet, and U0 represents the effective value of the inverter output line voltage of the traction machine. Each of the permanent magnets is an arc-shaped plate. The permanent magnet includes a first surface and a second surface that are arranged radially opposite to each other along the rotor core. The second surface is adjacent to the axis of the rotor. R1 is the radius of the first surface, R2 is the radius of the second surface, a1 is the central angle occupied by the magnet slot on the rotor, a2 = 180° / n, and the number of permanent magnets is 2n. The permanent magnets are symmetrically arranged relative to the radial mid-plane, which passes through the axis of the rotor; The permanent magnet also includes two magnet sides, which are located on both sides of the permanent magnet in the circumferential direction. The intersection line between the magnet sides and the second surface is an inner intersection line, and the reference surface passing through the inner intersection line and parallel to the radial mid-plane is a side reference surface. The first surface is smaller than the second surface. The area enclosed by the side surface of the magnet, the side reference surface and the cylindrical surface where the first surface is located is a sector area. The central angle of the sector area is b. S1 is the projected area of ​​the sector area on the vertical plane of the axis. S2 is the projected area of ​​the permanent magnet on the vertical plane of the axis. The vertical plane of the axis is perpendicular to the axis of the rotor. The radial shoulder includes a shoulder circumferential surface and two shoulder side surfaces on both sides in the circumferential direction, and the radius of the shoulder circumferential surface is R3.

2. The rotor of the traction machine according to claim 1, characterized in that, The side of the magnet is connected to the second surface by a first rounded corner.

3. The rotor of the traction machine according to claim 2, characterized in that, The shoulder side is connected to the bottom surface of the magnet groove by a second rounded corner, the radius of which is smaller than the radius of the first rounded corner.

4. The rotor of the traction machine according to claim 1, characterized in that, The shoulder side is in contact with the magnet side.

5. The rotor of the traction machine according to claim 1, characterized in that, The permanent magnet is fixed to the rotor core by adhesive.

6. The rotor of the traction machine according to claim 1, characterized in that, The rotor core is formed by stacking multiple rotor laminations axially, or by integrally machining a magnetic conductor.

7. The rotor of the traction machine according to claim 1, characterized in that, The radial shoulder has a chamfer at the connection between the shoulder circumference and the shoulder side surface, and a chamfer at the connection between the shoulder side surface and the bottom surface of the magnet groove, and the chamfer radius is in the range of 0.3mm to 0.8mm.

8. The rotor of the traction machine according to any one of claims 1-7, characterized in that, Also includes: The baffles on both sides of the rotor core are used to block the permanent magnet at both ends of the axis.

9. The rotor of the traction machine according to claim 8, characterized in that, The rotor core is provided with multiple axially penetrating connecting holes. The rotor is passed through multiple fasteners at the multiple connecting holes, and the two ends of each fastener are connected to the baffles on both sides.

10. A traction machine, characterized in that, It includes a stator and a rotor that cooperates with the stator, the rotor being the rotor of a traction machine according to any one of claims 1-9.

11. An elevator, characterized in that, Includes the traction machine according to claim 10.

Images