A dual-in-line rotor permanent magnet synchronous motor

Abstract

The utility model discloses a kind of double parallel rotor permanent magnet synchronous motor, including shell, its inner cavity is equipped with stator assembly, two rotor assemblies symmetrically arranged are equipped in stator assembly inside, each rotor assembly is equipped with shaft, shaft is rotatably connected on shell;Stator assembly includes stator core integrally formed and fixedly connected in the inner cavity of shell, the inner cavity of stator core is "∞" shape, magnetic field isolation groove is equipped between left side core cavity and right side core cavity, non-magnetic magnetic isolation material is filled in magnetic field isolation groove;By setting magnetic field isolation groove between the left and right core cavities of stator core, and filling specific non-magnetic magnetic isolation material, simultaneously, the neutral point is connected by star connection of two side stator windings and balance resistance, double design synergistic effect, effectively weaken the mutual coupling and interference of two side magnetic field, significantly improve the stability and reliability of motor operation.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet synchronous motor technology, and in particular to a dual parallel rotor permanent magnet synchronous motor. Background Technology

[0002] Permanent magnet synchronous motors, thanks to the excitation characteristics of permanent magnets, maintain synchronization between rotor speed and stator winding current frequency, making them widely used in various transmission scenarios.

[0003] The existing patent document with publication number CN114069999A discloses a parallel-shaft dual-rotor permanent magnet synchronous motor structure, in which the stator core is "∞" shaped, the stator windings on both sides are symmetrically distributed and independently powered, and the permanent magnets on both rotors are distributed with opposite polarities about the central axis of the parallel connection area. This structure can replace the gear transmission structure in traditional parallel drive equipment, reducing the size and weight of the equipment.

[0004] However, although the above-mentioned parallel-shaft dual-rotor permanent magnet synchronous motor structure can replace the traditional gear transmission structure to reduce the size and weight of the equipment, the parallel area of ​​the "∞"-shaped stator core still has magnetic field coupling problems. The magnetic fields generated by the windings on both sides interfere with each other and cannot be completely eliminated, thus affecting the stability and reliability of the motor operation.

[0005] To address this, a dual parallel rotor permanent magnet synchronous motor is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a dual parallel rotor permanent magnet synchronous motor to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include: A dual-parallel rotor permanent magnet synchronous motor includes a housing with a stator assembly inside. The stator assembly contains two symmetrically arranged rotor assemblies. Each rotor assembly has a rotating shaft rotatably connected to the housing. The stator assembly includes a stator core that is fixedly connected to the inner cavity of the housing and integrally formed. The inner cavity of the stator core is in the shape of "∞". A magnetic field isolation groove is provided between the left and right core cavities. The magnetic field isolation groove is filled with a non-magnetic shielding material. Stator slots are evenly distributed on the peripheral walls of both the left and right core cavities of the stator core. Stator windings are embedded in the stator slots. The stator windings of the left and right core cavities of the stator core are both connected in a star configuration, and their neutral terminals are connected through a balancing resistor.

[0008] As a preferred technical solution, the bottom of the housing is fixedly connected to two symmetrically arranged mounting bases.

[0009] As a preferred technical solution, the rotor assembly includes a cylindrical rotor core, with one rotor core rotatably mounted in the left and right core cavities of the stator core, respectively. A plurality of annularly distributed permanent magnets are embedded in the outer peripheral wall of the rotor core, with adjacent permanent magnets having opposite polarities.

[0010] As a preferred technical solution, the rotor core is fixedly sleeved on the outer surface of the corresponding rotating shaft, and the rotating rod axes of the two rotor cores are parallel and coplanar.

[0011] As a preferred technical solution, the outer surface of the permanent magnet is flush with the outer circumferential wall of the rotor core, and the polarities of the permanent magnets in the left and right core cavities of the stator core are symmetrically distributed about the central axis of the magnetic field isolation groove.

[0012] As a preferred technical solution, the surface of the permanent magnet is coated with a titanium nitride coating, the thickness of which is 5-10 μm.

[0013] As a preferred technical solution, a magnetic shielding collar is fixedly connected between the inner cavity of the rotor core and the outer surface of the shaft.

[0014] As a preferred technical solution, the non-magnetic magnetic shielding material is an epoxy resin-based composite material.

[0015] This utility model has at least the following beneficial effects: This application, by setting a magnetic field isolation groove between the left and right core cavities of the stator core and filling it with a specific non-magnetic magnetic shielding material, and by using a star connection for the stator windings on both sides and connecting them to the neutral point through a balancing resistor, achieves a dual design synergistic effect, effectively weakening the mutual coupling and interference of the magnetic fields on both sides, and significantly improving the stability and reliability of motor operation. The integrated stator core and symmetrically arranged rotor assembly ensure the compactness and stress balance of the structure, continuing the advantages of replacing gear transmission and simplifying equipment structure, and further optimizing the overall operating performance of the motor. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the casing of this utility model; Figure 3 This is a schematic front view of the stator assembly and rotor assembly of this utility model.

[0017] In the diagram: 100, housing; 110, mounting base; 200, stator assembly; 210, stator core; 220, magnetic field isolation slot; 230, stator slot; 300, rotor assembly; 310, rotor core; 320, permanent magnet; 330, magnetic isolation collar; 400, shaft. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-3 This utility model provides a dual parallel rotor permanent magnet synchronous motor, including a housing 100, a stator assembly 200, a rotor assembly 300, and a shaft 400. The stator assembly 200 is disposed in the inner cavity of the housing 100. Two rotor assemblies 300 are symmetrically arranged inside the stator assembly 200. A shaft 400 is provided on each rotor assembly 300 and is rotatably connected to the housing 100 via bearings. The stator assembly 200 includes a stator core 210 integrally formed and fixedly connected to the inner cavity of the housing 100. The inner cavity of the stator core 210 is in the shape of an infinity symbol (∞), and a magnetic field isolation is provided between the left and right core cavities. The slot 220, a magnetic field isolation slot, is filled with non-magnetic shielding material. Stator slots 230 are evenly distributed on the peripheral walls of the left and right core cavities of the stator core 210. Stator windings are embedded in the slots 230. The stator windings in the left and right core cavities of the stator core 210 are both connected in a star configuration, and their neutral points are connected through a balancing resistor. Through the combined design of the "∞"-shaped inner cavity of the stator core 210, the magnetic field isolation slot 220, and the neutral point balancing resistor of the windings, the magnetic field coupling path is blocked structurally, the mutual interference between the magnetic fields on both sides is weakened, the stability of motor operation is improved, and the core defects of the existing technology are solved.

[0020] The bottom of the housing 100 is fixedly connected to two symmetrically arranged mounting bases 110; these provide stable mounting support for the motor as a whole, facilitate the fixed assembly of the motor with external equipment, and ensure the structural stability after installation.

[0021] The rotor assembly 300 includes a cylindrical rotor core 310, which is rotatably mounted in the left and right core cavities of the stator core 210. Several annular permanent magnets 320 are embedded in the outer peripheral wall of the rotor core 310, with adjacent permanent magnets 320 having opposite polarities. This can form a stable and uniform rotor magnetic field, providing continuous power for the motor rotation and ensuring the smooth operation of the rotor assembly 300.

[0022] The rotor core 310 is fixedly sleeved on the outer surface of the corresponding rotating shaft 400. The rotating rod axes of the two rotor cores 310 are parallel and coplanar. This achieves a stable connection between the rotor core 310 and the rotating shaft 400, ensuring that the two rotate coaxially. This makes the rotor assembly 300 subjected to uniform force during rotation, avoids eccentric swaying, and improves rotational stability.

[0023] Among them, the outer surface of the permanent magnet 320 is flush with the outer circumferential wall of the rotor core 310, reducing rotational resistance. The polarities of the permanent magnets 320 in the left and right core cavities of the stator core 210 are symmetrically distributed about the central axis of the magnetic field isolation slot 220, which optimizes the magnetic field distribution between the stator assembly 200 and the rotor assembly 300, further reducing magnetic field interference and improving energy conversion efficiency.

[0024] The permanent magnet 320 has a titanium nitride coating on its surface, with a thickness of 5-10 μm. This coating effectively protects the permanent magnet 320 from external environmental erosion and wear during operation, thus extending its service life.

[0025] Among them, a magnetic shielding collar 330 is fixedly connected between the inner cavity of the rotor core 310 and the outer surface of the shaft 400; it can block the magnetic field conduction path between the rotor core 310 and the shaft 400, avoid magnetic field leakage from interfering with the shaft 400 and other components, and enhance the connection stability of the rotor assembly 300 structure.

[0026] The feature is that the non-magnetic magnetic shielding material is an epoxy resin-based composite material; it specifically enhances the magnetic field isolation effect, ensuring that the magnetic field isolation groove 220 can effectively block the magnetic field coupling on both sides, thus ensuring the effectiveness of the overall magnetic shielding design.

[0027] The working principle of this utility model is as follows: When the motor is working, the external power supply supplies power to the stator windings on both sides of the stator assembly 200. After the stator windings are energized with current, a rotating magnetic field is generated. Under the electromagnetic force of the rotating magnetic field, the permanent magnet 320 of the rotor assembly 300 drives the rotor core 310 and the shaft 400 to rotate synchronously. Since the magnetic field isolation groove 220 filled with non-magnetic magnetic shielding material is provided between the left and right core cavities of the stator core 210, it can effectively block the mutual penetration of the magnetic fields on both sides. At the same time, the neutral points of the stator windings on both sides are connected by a balancing resistor, which can balance the potential difference between the windings on both sides and further suppress magnetic field coupling interference. The rotor assemblies 300 on both sides rotate synchronously under the action of the symmetrical magnetic field and output power through the shaft 400 to achieve efficient power transmission without gears. Moreover, the magnetic field interference is small and the stability is strong during operation.

[0028] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual parallel rotor permanent magnet synchronous motor, characterized in that, The system includes a housing (100), the inner cavity of which is provided with a stator assembly (200). Inside the stator assembly (200) are two symmetrically arranged rotor assemblies (300). Each rotor assembly (300) is provided with a rotating shaft (400), which is rotatably connected to the housing (100). The stator assembly (200) includes a stator core (210) that is fixedly connected to the inner cavity of the housing (100) and integrally formed. The inner cavity of the stator core (210) is in the shape of "∞". A magnetic field isolation groove (220) is provided between the left and right core cavities. The magnetic field isolation groove (220) is filled with a non-magnetic shielding material. Stator slots (230) are evenly distributed on the peripheral walls of the left and right core cavities of the stator core (210). Stator windings are embedded in the stator slots (230). The stator windings of the left and right core cavities of the stator core (210) are both connected in a star configuration, and their neutral terminals are connected through a balancing resistor.

2. The dual parallel rotor permanent magnet synchronous motor according to claim 1, characterized in that: The bottom of the housing (100) is fixedly connected to two symmetrically arranged mounting bases (110).

3. The dual parallel rotor permanent magnet synchronous motor according to claim 1, characterized in that: The rotor assembly (300) includes a cylindrical rotor core (310), which is rotatably positioned in the left and right core cavities of the stator core (210). A plurality of annularly distributed permanent magnets (320) are embedded in the outer peripheral wall of the rotor core (310), and the polarities of two adjacent permanent magnets (320) are opposite.

4. The dual parallel rotor permanent magnet synchronous motor according to claim 3, characterized in that: The rotor core (310) is fixedly sleeved on the outer surface of the corresponding rotating shaft (400), and the rotating rod axes of the two rotor cores (310) are parallel and coplanar.

5. The dual parallel rotor permanent magnet synchronous motor according to claim 3, characterized in that: The outer surface of the permanent magnet (320) is flush with the outer circumferential wall of the rotor core (310). The polarities of the permanent magnets (320) in the left core cavity and the right core cavity of the stator core (210) are symmetrically distributed about the central axis of the magnetic field isolation groove (220).

6. The dual parallel rotor permanent magnet synchronous motor according to claim 5, characterized in that: The surface of the permanent magnet (320) is coated with a titanium nitride coating, the thickness of which is 5-10 μm.

7. The dual parallel rotor permanent magnet synchronous motor according to claim 3, characterized in that: A magnetic shielding collar (330) is fixedly connected between the inner cavity of the rotor core (310) and the outer surface of the shaft (400).

8. The dual parallel rotor permanent magnet synchronous motor according to any one of claims 1-7, characterized in that: The non-magnetic magnetic shielding material is an epoxy resin-based composite material.

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