A concentrated winding permanent magnet synchronous traction machine for elevator

Abstract

The application relates to a concentrated winding permanent magnet synchronous traction machine for an elevator, which comprises a shell, a stator and a rotor arranged in the shell, the stator comprises a stator core, the inner diameter B of the stator core is 180 mm, 30 straight slots are equidistantly arranged on the stator core in the circumferential direction, the slot opening width A of each straight slot towards the end of the rotor is 3.8 mm, 28 magnetic steels are equidistantly arranged on the outer circumferential wall of the rotor in the circumferential direction, and the width D of each magnetic steel is 15.9 mm; the straight slot-straight pole method is adopted, the stator core inner diameter, the number of straight slots, the slot opening width, the number of magnetic steels and the width of each magnetic steel are optimally selected, so that the purpose of inhibiting the cogging torque is achieved, the noise and vibration of the permanent magnet synchronous traction machine are reduced, the temperature rise of the magnetic steels is synchronously reduced, material cost is saved, the motor reliability is higher, and the operation life is longer; the method for reducing the cogging torque of the elevator traction machine by adopting the inclined slot or inclined pole method in the prior art can cause high temperature rise of the magnetic steels, influence the service life of the magnetic steels, and the process is complex and the cost is high.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet synchronous traction machine technology, specifically to a centralized winding permanent magnet synchronous traction machine for elevators. Background Technology

[0002] Permanent magnet synchronous motors (PMSMs) require coils, which result in cogging. The presence of cogging generates magnetomotive force and magnetic harmonics. These harmonics produce additional torque, known as cogging torque. When the motor rotor rotates, cogging torque manifests as an additional pulsating torque. While it doesn't increase or decrease the motor's average torque, it does generate vibration and noise. In variable-speed drives, if the frequency of the cogging torque approaches the system's natural frequency, it can cause resonance and loud noise, even preventing the motor from functioning properly. Furthermore, large cogging torques can cause starting difficulties. Therefore, suppressing cogging torque is a crucial consideration in PMSM design.

[0003] Currently, methods such as skewed pole method, skewed slot method, segmented method, large and small tooth method, and additional slot method are commonly used to suppress cogging torque. However, some of these methods are not suitable for concentrated winding permanent magnet motors, such as the skewed slot method; others are too costly or cause other adverse consequences such as magnet overheating and increased motor size, limiting their application in concentrated winding permanent magnet motors, such as the skewed pole method and the segmented method. In the elevator industry, people have high requirements for the comfort of elevator operation. Currently, most home elevator traction machines in the industry use skewed slot or skewed pole methods to reduce cogging torque. However, skewed slot or skewed pole methods also cause the temperature of the magnets to rise in the traction machine itself, which is a great detriment to the life of the magnets in the long run. The manufacturing process of skewed slot or skewed pole methods is also relatively complex and requires high magnet performance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a centralized winding permanent magnet synchronous traction machine that reduces cogging torque while also exhibiting lower temperature rise, smaller size, less material consumption, and longer lifespan.

[0005] To solve the above-mentioned technical problems, the present invention provides a centralized winding permanent magnet synchronous traction machine for elevators, including a housing, and a stator and a rotor arranged coaxially inside the housing. The stator includes a stator core, wherein the inner diameter B of the stator core is 180mm, and 30 straight slots are equidistantly arranged along the circumference of the stator core, and the slot width A of each straight slot facing the rotor end is 3.8mm. 28 magnets are equidistantly arranged along the circumference of the outer peripheral wall of the rotor, and the width D of each magnet is 15.9mm.

[0006] With the above structure, the elevator centralized winding permanent magnet synchronous traction machine of the present invention has the following advantages: by adopting the straight slot-straight pole method, under specific and preferred pole-slot matching, by optimizing the inner diameter of the stator core, the number of straight slots and the slot width, and the number and width of the magnets, the purpose of suppressing cogging torque is achieved, thereby reducing the noise and vibration of the permanent magnet synchronous traction machine, simultaneously reducing the temperature rise of the magnets, saving material costs, and the overall size of the motor is small, with stronger reliability and longer service life.

[0007] As an improvement, each magnet has two ends that are circular arcs along the radial direction of the permanent magnet synchronous traction machine, and the radius C of the circle containing the arc is 84.7mm. With this structure, the radius of the magnetic arc is optimized, which further reduces the cogging torque.

[0008] As an improvement, the stator core includes 30 stator blocks, which are spliced ​​together circumferentially to form the stator core, and a straight slot is formed between every two adjacent stator blocks; this structure facilitates the production and installation of the stator core.

[0009] As an improvement, each stator module has protrusions on both sides of the end closest to the rotor, facing the adjacent stator module; with this structure, the protrusions facilitate winding on the stator module.

[0010] As an improvement, each stator assembly is fitted with an insulating sleeve assembly, each insulating sleeve assembly including a first insulating sleeve and a second insulating sleeve. The first insulating sleeve and the second insulating sleeve are respectively fitted onto both sides of the stator assembly along the axial direction of the permanent magnet synchronous traction machine, and the two ends of the stator assembly along the radial direction of the permanent magnet synchronous traction machine are exposed outside the insulating sleeve assembly. This structure ensures that the present invention can operate normally and prevents short circuits.

[0011] As an improvement, the magnet thickness E is 4mm; with this structure, the magnet thickness is optimized, further reducing the cogging torque.

[0012] As an improvement, the magnet is made of neodymium magnets; with this structure, the neodymium magnets can meet the performance requirements of the present invention, while saving material costs.

[0013] As an improvement, a brake is provided at one end of the housing; with this structure, the brake is used to stop the rotor from running.

[0014] As an improvement, a junction box is provided on the outer wall of the housing; this structure facilitates the wiring of the permanent magnet synchronous traction machine. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the stator and rotor structure when the insulating sleeve assembly is not installed in this invention.

[0016] Figure 2 for Figure 1 A magnified view of part F in the middle.

[0017] Figure 3 This is an exploded view of the overall structure of the present invention.

[0018] Figure 4 This is a schematic diagram of the stator and rotor structure when the insulating sleeve assembly is installed in this invention.

[0019] Figure 5 for Figure 4 A magnified view of a section of the G-shaped area.

[0020] Reference numerals: 1. Outer casing; 2. Stator; 21. Stator core; 211. Stator assembly; 3. Rotor; 4. Straight slot; 5. Magnet; 6. Protrusion; 7. Insulating sleeve assembly; 71. First insulating sleeve; 72. Second insulating sleeve; 8. Brake; 9. Junction box. Detailed Implementation

[0021] The present invention provides a detailed description of a centralized winding permanent magnet synchronous traction machine for elevators, with reference to the accompanying drawings.

[0022] like Figures 1 to 5 As shown, a centralized winding permanent magnet synchronous traction machine for elevators includes a housing 1. Inside the housing 1, a stator 2 and a rotor 3 are coaxially arranged. The stator 2 includes a stator core 21, wherein the inner diameter B of the stator core 21 is 180 mm. Thirty straight slots 4 are equidistantly arranged along the circumference of the stator core 21, and the slot width A of each straight slot 4 facing the rotor 3 is 3.8 mm. Furthermore, the central axis of each straight slot 4 passes through the center of the stator core 21. The outer circumferential wall of the rotor 3... Twenty-eight magnets 5 are evenly spaced, each with a width D of 15.9 mm and a thickness E of 4 mm. Each magnet 5 has rounded ends along the radial direction of the permanent magnet synchronous traction machine, with a radius C of 84.7 mm. This means that both ends of the magnet 5 near the stator 2 and the rotor 3 are rounded, and the end of the magnet 5 near the rotor 3 is in contact with the outer peripheral wall of the rotor 3, meaning the outer radius of the rotor 3 is also 84.7 mm. The magnets 5 are made of neodymium magnets of grade N38H instead of the conventional N38SH, saving material costs while meeting performance requirements.

[0023] The stator core 21 comprises 30 stator modules 211, which are assembled circumferentially to form the stator core 21. A straight slot 4 is formed between every two adjacent stator modules 211, making the production and installation of the stator core 21 more convenient. Figure 2 As shown, each stator assembly 211 has a protrusion 6 on both sides of the end closest to the rotor 3, which faces the adjacent stator assembly 211. The end of the protrusion 6 away from the rotor 3 is a bevel, which facilitates winding on the stator assembly 211.

[0024] like Figure 4 and Figure 5 As shown, each stator assembly 211 is fitted with an insulating sleeve assembly 7. Each insulating sleeve assembly 7 includes a first insulating sleeve 71 and a second insulating sleeve 72. The first insulating sleeve 71 and the second insulating sleeve 72 are respectively fitted onto both sides of the stator assembly 211 along the axial direction of the permanent magnet synchronous traction machine. The two ends of the stator assembly 211 along the radial direction of the permanent magnet synchronous traction machine are exposed outside the insulating sleeve assembly 7. That is, the end of the stator assembly 211 that is closer to the rotor 3 and the end that is farther away from the rotor 3 are both exposed outside the insulating sleeve assembly 7.

[0025] like Figure 3 As shown, in order to facilitate stopping the rotor 3, a brake 8 is provided at one end of the housing 1, and a junction box 9 is provided on the outer wall of the housing 1 to facilitate the wiring of the permanent magnet synchronous traction machine.

[0026] In this invention, the straight slot-straight pole method is adopted. Under specific and preferred pole-slot matching, by optimizing the inner diameter B of the stator core 21, the number of straight slots 4 and the slot width A, the number of magnets 5 and the width D, arc C and thickness E of the magnets 5, the purpose of suppressing cogging torque is achieved, thereby reducing the noise and vibration of the permanent magnet synchronous traction machine, simultaneously reducing the temperature rise of the magnets 5, saving material costs, and the overall size of the motor is small, the reliability is stronger, and the service life is longer.

[0027] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiment. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A centralized winding permanent magnet synchronous traction machine for elevators, comprising a housing (1), wherein a stator (2) and a rotor (3) are coaxially arranged within the housing (1), the stator (2) comprising a stator core (21), characterized in that, The inner diameter B of the stator core (21) is 180mm. The stator core (21) has 30 straight slots (4) evenly spaced along the circumference, and the slot width A of each straight slot (4) facing the rotor (3) is 3.8mm. The outer circumferential wall of the rotor (3) has 28 magnets (5) evenly spaced along the circumference, and the width D of each magnet (5) is 15.9mm. The magnets (5) are distributed in a straight pole configuration. Each of the magnets (5) has two ends that are circular arcs along the radial direction of the permanent magnet synchronous traction machine, and the radius C of the circle containing the circular arc is 84.7 mm.

2. The elevator-use centralized winding permanent magnet synchronous traction machine according to claim 1, characterized in that, The stator core (21) includes 30 stator blocks (211), which are spliced ​​together circumferentially to form the stator core (21), and a straight slot (4) is formed between every two adjacent stator blocks (211).

3. A centralized winding permanent magnet synchronous traction machine for elevators according to claim 2, characterized in that, Each of the stator blocks (211) has a protrusion (6) on both sides of one end near the rotor (3) facing the adjacent stator block (211).

4. A centralized winding permanent magnet synchronous traction machine for elevators according to claim 2, characterized in that, Each stator assembly (211) is fitted with an insulating sleeve assembly (7), each insulating sleeve assembly (7) includes a first insulating sleeve (71) and a second insulating sleeve (72). The first insulating sleeve (71) and the second insulating sleeve (72) are respectively fitted on both sides of the stator assembly (211) along the axial direction of the permanent magnet synchronous traction machine. The two ends of the stator assembly (211) along the radial direction of the permanent magnet synchronous traction machine are exposed outside the insulating sleeve assembly (7).

5. A centralized winding permanent magnet synchronous traction machine for elevators according to claim 1, characterized in that, The thickness E of the magnet (5) is 4mm.

6. A centralized winding permanent magnet synchronous traction machine for elevators according to claim 1 or 5, characterized in that, The magnet (5) is made of neodymium magnet.

7. A centralized winding permanent magnet synchronous traction machine for elevators according to claim 1, characterized in that, A brake (8) is provided at one end of the outer casing (1).

8. A centralized winding permanent magnet synchronous traction machine for elevators according to claim 1, characterized in that, A junction box (9) is provided on the outer wall of the outer casing (1).

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