Duplex-winding direct-drive permanent magnet synchronous motor

Abstract

The invention belongs to the technical field of permanent magnet motors, and particularly relates to a duplex-winding direct-drive permanent magnet synchronous motor which comprises a fixed shaft, two stators are arranged on the fixed shaft in a sleeving mode, a rotor support is arranged on the peripheries of the two stators in a sleeving mode, and a magnetic pole assembly is arranged between the rotor support and each stator. According to the invention, the structure is simple, the winch drum can be directly driven, a mine car is pulled up to the ground from the bottom of a mine pit along a slope track, the transportation time of mine trucks is obviously prolonged, the energy consumption and the spare part loss are greatly reduced, and in the working process of the motor, the working efficiency is greatly improved. The two stators can operate synchronously and independently, when one stator breaks down, operation of the lifting system is not affected, and the situation that the lifting system stops working due to motor faults, and dangerous situations are caused is avoided.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet motor technology, specifically relating to a dual-winding direct-drive permanent magnet synchronous motor. Background Technology

[0002] Large open-pit coal mines typically use mining trucks to transport raw coal and gangue from the bottom of the pit to the surface via spiral ascent roads. However, these trucks consume large amounts of fuel during transport, generating significant amounts of exhaust gas and dust, causing serious environmental pollution. Furthermore, the long and labor-intensive ascent path places higher demands on the performance of the mining trucks, requiring continuous inspection and maintenance, which can hinder the progress of mining operations.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] To address the problems existing in the prior art, the inventors propose a dual-winding direct-drive permanent magnet synchronous motor that can lift mine trucks from the bottom of the mine pit to the ground via a ramp track. This invention also employs a "double insurance" structure, ensuring that if one motor fails, the other can maintain normal system operation. Furthermore, this invention achieves direct drive of the winch drum by the motor, resulting in a simple structure that eliminates the complex transmission chain, improves the stress state of the overall motor structure, and enhances the reliability of the coal transportation process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention proposes a dual-winding direct-drive permanent magnet synchronous motor, including a stator shaft, two stators mounted on the stator shaft, a rotor support mounted around the two stators, a set of magnetic pole assemblies between the rotor support and each stator, and a winch drum fixedly mounted on the outside of the rotor support.

[0007] Specifically, the stator is fixedly sleeved on the fixed shaft by a first flange, which is either welded to the fixed shaft or integrally formed with the fixed shaft.

[0008] Specifically, the winch drum is interference-fitted with the rotor support, and both ends of the winch drum are welded to the rotor support.

[0009] Specifically, the rotor support includes a magnetic yoke, the winch drum is sleeved on the magnetic yoke, a stiffener is provided between the magnetic yoke and the winch drum, the magnetic pole assembly is located between the magnetic yoke and the stator, and both ends of the magnetic yoke are connected to the second flange.

[0010] Specifically, the stiffener includes multiple annular stiffeners and multiple axial stiffeners. The axial stiffeners are arranged on the outer surface of the magnetic yoke along the axial direction. The inner circle of the annular stiffener is connected to the outer surface of the magnetic yoke, and the outer circle is connected to the winch drum.

[0011] Specifically, the magnetic yoke has air guide plates at corresponding intervals at both ends along the circumference. The air guide plate at each end of the magnetic yoke is located between the winch drum and the second flange. The multiple circumferential stiffeners are provided with ventilation holes, which are located between two adjacent air guide plates.

[0012] Specifically, each stator is provided with a bearing system on its outer side, the bearing system is fitted onto the stator shaft, a motor end cover is fitted onto the outer circle of the bearing system, the outer circle of the motor end cover is connected to the inner circle of the second flange, a bearing seat is provided on the inner circle of the motor end cover, and the bearing system is fixedly connected to the bearing seat through the bearing end covers on both sides, and a brake disc is fitted onto the outer circle of the second flange.

[0013] Specifically, the motor end cover is provided with a manhole, a maintenance hole and an air gap detection hole. The maintenance hole is directly opposite the end ring of the stator, and the air gap detection hole is directly opposite the air gap position between the stator and rotor.

[0014] Specifically, an oil injection hole is provided in the middle of the bearing position, the oil injection hole is directly opposite the oil groove of the bearing system, an oil drain hole is provided on the bearing end cover, the oil drain hole is connected to the bearing chamber of the bearing system, and an oil collection bottle is provided on the outside of the oil drain hole.

[0015] Specifically, radial stiffeners are provided on both sides of the motor end cover.

[0016] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0017] (1) The present invention installs two stators inside a rotor support and fixes the winch drum directly to the outside of the rotor support, which reduces the complexity of the system design and enables the mine car to be pulled up from the bottom of the mine pit to the ground along the inclined track. In addition, the present invention also serves as a motor backup. The two stators can operate synchronously and independently, avoiding the occurrence of dangerous situations caused by motor failure leading to the hoisting system stopping operation.

[0018] (2) Since the winch drum is sensitive to temperature, the present invention isolates the winch drum from the magnetic yoke. The magnetic yoke and the winch drum are connected by stiffeners. The stiffeners effectively prevent the temperature of the magnetic yoke inside the motor from affecting the winch drum, while improving the strength of the rotor support and providing space for cooling of the magnetic yoke.

[0019] (3) The ribs of the present invention include circumferential ribs, and multiple circumferential ribs are distributed at intervals between the magnetic yoke and the winch drum. The inner circle of the circumferential ribs is connected to the outer surface of the magnetic yoke, and the outer circle is connected to the winch drum. After ventilation holes are opened on the multiple circumferential ribs, during the operation of the motor, the rotor support rotates, and the natural cooling air enters from one end ventilation hole and exits from the other end ventilation hole, using natural wind and the narrow tube effect to efficiently cool the motor.

[0020] (4) The present invention provides a manhole, inspection hole and air gap detection hole on the motor end cover. Without disassembling the motor, the water jacket, water pipe, cable, bearing, bolt and other internal components of the motor can be maintained through the manhole; the stator end ring can be inspected through the inspection hole; and the air gap detection hole can be used to detect the air gap between the stator and rotor. This reduces the motor operation and maintenance cost while ensuring the long-term reliable operation of the motor. Attached Figure Description

[0021] The accompanying drawings are incorporated in and form part of this specification, and together with the description serve to explain the principles of the invention.

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the dual-winding direct-drive permanent magnet synchronous motor of the present invention;

[0024] Figure 2 This is a cross-sectional view of the dual-winding direct-drive permanent magnet synchronous motor of the present invention;

[0025] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0026] Reference numerals in the attached drawings: 1. Stator; 2. First flange; 3. Motor end cover; 4. Brake disc; 5. Magnetic pole assembly; 6. Stator; 7. Rotor support; 701. Magnetic yoke; 702. Annular stiffener; 703. Second flange; 8. Winch drum; 9. Bearing system; 10. Air guide plate; 11. Ventilation hole; 12. Bearing end cover. Detailed Implementation

[0027] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses consistent with some aspects of the invention as detailed in the appended claims.

[0028] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Example

[0030] refer to Figure 1 and Figure 2 This embodiment proposes a dual-winding direct-drive permanent magnet synchronous motor, including a fixed shaft 1, on which two stators 6 are sleeved, i.e., the two stators 6 are connected in series on the fixed shaft 1. A rotor support 7 is sleeved around the two stators 6. A set of magnetic pole assemblies 5 is provided between the rotor support 7 and each stator 6. The magnetic pole assemblies 5 are installed in the mounting interface on the inner wall of the rotor support 7. A winch drum 8 is fixedly sleeved on the outside of the rotor support 7.

[0031] In this embodiment, two parallel stators 6 are arranged between the fixed shaft 1 and the rotor support 7. Two sets of magnetic pole assemblies 5 are arranged on the inner wall of the rotor support 7, with each set of magnetic pole assemblies 5 corresponding to one stator 6. The winch drum 8 is sleeved on the outside of the rotor support 7. The structure is simple and can directly drive the winch drum 8 to pull the mine car up from the bottom of the mine pit to the ground along the inclined track, which significantly improves the transportation time of the mine car and greatly reduces energy consumption and spare parts wear. During the operation of the motor, the two stators 6 can operate synchronously and independently. If one stator 6 fails, it will not affect the operation of the hoisting system, avoiding the hoisting system from stopping due to motor failure and causing dangerous situations.

[0032] For ease of positioning and installation, in this embodiment, the stator 6 is fixedly fitted onto the fixed shaft 1 via the first flange 2. The first flange 2 is welded to the fixed shaft 1 or integrally formed with the fixed shaft 1. After the stator 6 is fitted onto the fixed shaft 1, it is fixedly connected to the first flange 2 by bolts or other connecting parts. To ensure the reliability of the connection between the rotor support 7 and the winch drum 8, in this embodiment, the winch drum 8 is interference-fitted with the rotor support 7, and both ends of the winch drum 8 are welded to the rotor support 7.

[0033] In this embodiment, the rotor support 7 includes a magnetic yoke 701, and the winch drum 8 is fitted onto the magnetic yoke 701. Ribs are provided between the magnetic yoke 701 and the winch drum 8. The magnetic pole assembly 5 is located between the magnetic yoke 701 and the stator 6, i.e., the mounting interface is located on the inner wall of the magnetic yoke 701. The magnetic pole assembly 5 is positioned between the magnetic yoke 701 and the stator 6 through the mounting interface. Both ends of the magnetic yoke 701 are connected to the second flange 703. To ensure the strength and reliability of the rotor support 7, the ribs include multiple annular ribs 702 and multiple axial ribs. The axial ribs are arranged axially along the outer surface of the magnetic yoke 701. The inner circle of the annular rib 702 is connected to the outer surface of the magnetic yoke 701, and the outer circle is connected to the winch drum 8. In this embodiment, the winch drum 8 and the magnetic yoke 701 are isolated by a ring-shaped stiffener 702. This not only effectively avoids the influence of the temperature of the magnetic yoke 701 inside the motor on the winch drum 8, but also helps to cool the motor simply and efficiently. The space between the winch drum 8 and the magnetic yoke 701 can act as a cold air duct. To achieve efficient cooling of the motor, air guide plates 10 are arranged at corresponding intervals along the circumference at both ends of the magnetic yoke 701. The air guide plate 10 at each end of the magnetic yoke 701 is located between the winch drum 8 and the second flange 703. Ventilation holes 11 are arranged on the multiple ring-shaped stiffeners. The ventilation holes 11 are located between two adjacent air guide plates 10, so that the ventilation holes 11 and the baffles do not interfere with each other. During the operation of the motor, the rotor support 7 rotates. With the assistance of the air guide plates, natural cooling air enters from one end ventilation hole 11 and exits from the other end ventilation hole 11, using natural wind and the narrow tube effect to efficiently cool the motor.

[0034] refer to Figure 3 In this embodiment, a bearing system 9 is provided on the outer side of each stator 6. The bearing system 9 is sleeved on the fixed shaft 1. A motor end cover 3 is sleeved on the outer circle of the bearing system 9. The outer circle of the motor end cover 3 is connected to the inner circle of the second flange 703. A bearing position is provided on the inner circle of the motor end cover 3. The bearing system 9 is fixedly connected to the bearing position through the bearing end covers 12 on both sides. A brake disc 4 is sleeved on the outer circle of the second flange 703. The brake disc 4 is composed of six petals spliced ​​into a whole circle. In order to improve the cooling efficiency of the motor, annular ribs 702 and radial ribs can also be provided on both sides of the motor end cover 3.

[0035] To reduce the maintenance cost of the motor, manholes, inspection holes, and air gap detection holes can be respectively provided on the motor end cover 3. There are two manholes, spaced 180° apart. The inspection holes are directly opposite the end ring of the stator 6, preferably evenly distributed at 120° intervals around the circumference, i.e., there are three inspection holes. The air gap detection holes are directly opposite the air gap between the stator and rotor, preferably eight evenly distributed around the circumference. An oil injection hole can be provided in the middle of the bearing position, directly opposite the oil groove of the bearing system 9. An oil drain hole is provided on the bearing end cover 12, communicating with the bearing chamber of the bearing system 9. An oil collection bottle is provided outside the oil drain hole. Preferably, there are four oil drain holes, evenly distributed around the circumference.

[0036] To seal the bearing, an installation groove can be provided on the inner circle of the bearing end cover 12, and the dynamic seal can be installed in the installation groove by a sealing pressure plate.

[0037] To collect spilled grease, a labyrinthine grease collection box can be installed on the outside of the dynamic seal, a dynamic grease collection box can be installed on the outside of the bearing cover, and a fixed grease collection box can be installed on the outside of the end cover of the fixed shaft 1.

[0038] To promptly grasp the operating status of the motor and proactively respond to emergencies, an intelligent online health monitoring system can be installed on the motor. This system includes online monitoring of winding temperature, cavity temperature, cooling water temperature, water pressure, motor leakage, bearing operating temperature, and spindle vibration. By configuring multiple temperature, vibration, speed, pressure, and liquid level sensors on the motor, it is endowed with three-dimensional sensing capabilities, enabling real-time accurate detection and intelligent operation and maintenance throughout the entire life cycle.

[0039] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

[0040] It should be understood that the present invention is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A dual-winding direct-drive permanent magnet synchronous motor, characterized in that, It includes a fixed shaft (1), on which two stators (6) are fitted. A rotor support (7) is fitted around the two stators (6). A set of magnetic pole assemblies (5) is provided between the rotor support (7) and each stator (6). A winch drum (8) is fixedly fitted around the outside of the rotor support (7).

2. The dual-winding direct-drive permanent magnet synchronous motor according to claim 1, characterized in that, The stator (6) is fixedly sleeved on the fixed shaft (1) by the first flange (2), which is welded to the fixed shaft (1) or integrally formed with the fixed shaft (1).

3. The dual-winding direct-drive permanent magnet synchronous motor according to claim 1, characterized in that, The winch drum (8) is interference-fitted with the rotor support (7), and both ends of the winch drum (8) are welded to the rotor support (7).

4. The dual-winding direct-drive permanent magnet synchronous motor according to claim 1, characterized in that, The rotor support (7) includes a magnetic yoke (701), the winch drum (8) is fitted on the magnetic yoke (701), a stiffener is provided between the magnetic yoke (701) and the winch drum (8), the magnetic pole assembly (5) is located between the magnetic yoke (701) and the stator (6), and both ends of the magnetic yoke (701) are connected to the second flange (703).

5. The dual-winding direct-drive permanent magnet synchronous motor according to claim 4, characterized in that, The stiffeners include multiple annular stiffeners (702) and multiple axial stiffeners. The axial stiffeners are arranged on the outer surface of the magnetic yoke (701) along the axial direction. The inner circle of the annular stiffeners (702) is connected to the outer surface of the magnetic yoke (701), and the outer circle is connected to the winch drum (8).

6. The dual-winding direct-drive permanent magnet synchronous motor according to claim 5, characterized in that, The magnetic yoke (701) has air guide plates (10) spaced at both ends along the circumference. The air guide plate (10) at each end of the magnetic yoke (701) is located between the winch drum (8) and the second flange (703). A plurality of the circumferential stiffeners are provided with ventilation holes (11), which are located between two adjacent air guide plates (10).

7. The dual-winding direct-drive permanent magnet synchronous motor according to claim 4, characterized in that, Each stator (6) is provided with a bearing system (9) on its outer side. The bearing system (9) is fitted onto the fixed shaft (1). A motor end cover (3) is fitted onto the outer circle of the bearing system (9). The outer circle of the motor end cover (3) is connected to the inner circle of the second flange (703). A bearing position is provided on the inner circle of the motor end cover (3). The bearing system (9) is fixedly connected to the bearing position through the bearing end covers (12) on both sides. A brake disc (4) is fitted onto the outer circle of the second flange (703).

8. The dual-winding direct-drive permanent magnet synchronous motor according to claim 7, characterized in that, The motor end cover (3) is provided with a manhole, a maintenance hole and an air gap detection hole. The maintenance hole is directly opposite the end ring of the stator (6) and the air gap detection hole is directly opposite the air gap position of the stator and rotor.

9. The dual-winding direct-drive permanent magnet synchronous motor according to claim 7, characterized in that, An oil injection hole is provided in the middle of the bearing position, and the oil injection hole is directly opposite the oil groove of the bearing system (9). An oil drain hole is provided on the bearing end cover (12), and the oil drain hole is connected to the bearing chamber of the bearing system (9). An oil collection bottle is provided on the outside of the oil drain hole.

10. The dual-winding direct-drive permanent magnet synchronous motor according to claim 7, characterized in that, Radial stiffeners are provided on both sides of the motor end cover (3).

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