A double magnetic field modulation type magnetic gear composite motor

Abstract

This invention discloses a dual-magnetic-field modulated magnetic gear composite motor, comprising a coaxially mounted drive shaft, a fixed end cover, a permanent magnet rotor, a motor stator, an auxiliary adjusting ring, and a fixed shaft. The fixed shaft is connected to the fixed end cover, and the fixed end cover and the pole shoes of the permanent magnet rotor have interconnecting screw holes. The fixed end cover and the pole shoes are fixed by bolts and nuts. The motor stator includes stator laminations and adjusting blocks, and is composed of laminated silicon steel sheets stacked together. The stator laminations and adjusting blocks are integrated into one unit. A main air gap is provided between the permanent magnet rotor and the motor stator. The auxiliary adjusting ring is fixed inside the permanent magnet rotor by the fixed shaft, and an auxiliary air gap is provided between the auxiliary adjusting ring and the permanent magnet rotor. The permanent magnets in the permanent magnet rotor have an embedded spoke structure. This invention can improve the structure of the magnetic circuit of the embedded spoke permanent magnet and enhance its torque performance in applications.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a dual-magnetic-field modulation magnetic gear composite motor. Background Technology

[0002] For traditional multi-gap magnetic gear composite motors, the magnetic field generated by the windings needs to pass through multiple air gaps before coupling with the rotor's permanent magnet magnetic field, resulting in excessively high air gap magnetic voltage drop and a decrease in overall efficiency. Furthermore, due to the multi-gap structure, existing magnetic gear composite motors remain structurally complex. Therefore, further optimization of the internal magnetic gear structure is needed to simplify the mechanical structure, reduce manufacturing costs, and improve operational reliability. Overly complex mechanical and magnetic circuit structures inevitably lead to increased losses in the magnetic gear composite motor, raising its operating costs and reducing its engineering application value.

[0003] To improve the torque density of magnetic gears, scholars both domestically and internationally have proposed an embedded spoke-type permanent magnet structure. Research has found that this structure not only increases the torque density of the magnetic gears but also significantly enhances the overall mechanical structure due to its unique embedded design. Therefore, this structure is widely used in magnetic gear composite motors. However, unlike traditional surface-mounted magnetic gear permanent magnets, this embedded spoke-type permanent magnet structure cannot utilize a Halebeck array to improve the magnetic circuit and increase torque performance. Therefore, there is an urgent need to propose a structure that can improve the magnetic circuit of embedded spoke-type permanent magnets to enhance their torque performance in various applications. Summary of the Invention

[0004] The purpose of this invention is to propose a dual-magnetic-field modulated magnetic gear composite motor to improve the structure of the magnetic circuit of the embedded spoke permanent magnet and enhance its torque performance in its application.

[0005] A dual-magnetic-field modulated magnetic gear composite motor includes a coaxially mounted drive shaft, a fixed end cover, a permanent magnet rotor, a motor stator, an auxiliary adjusting ring, and a fixed shaft. The fixed shaft is connected to the fixed end cover, and the fixed end cover and the pole shoes of the permanent magnet rotor have interconnecting screw holes. The fixed end cover and the pole shoes are fixed by bolts and nuts. The motor stator includes stator laminations and adjusting blocks. The motor stator is composed of laminated silicon steel sheets stacked together. The stator laminations and adjusting blocks are integrated into one unit. A main air gap is provided between the permanent magnet rotor and the motor stator. The auxiliary adjusting ring is fixed inside the permanent magnet rotor by the fixed shaft. An auxiliary air gap is provided between the auxiliary adjusting ring and the permanent magnet rotor. The permanent magnets in the permanent magnet rotor have an embedded spoke structure.

[0006] The dual-magnetic-field modulated magnetic gear composite motor proposed in this invention, through the integration of the adjusting magnetic block and stator laminations, reduces one air gap compared to the traditional dual-air-gap magnetic gear composite motor. This effectively reduces magnetic resistance in the motor's magnetic circuit, thereby improving the motor's operating efficiency and power factor. Due to the absence of interference from multiple air-gap magnetic fields, the motor's output power is more stable and its reliability is higher. The adoption of an embedded spoke-type magnetizing permanent magnet structure enhances the motor's torque performance, while the addition of an auxiliary adjusting magnetic ring improves the magnetic circuit of the permanent magnet rotor, reduces magnetic leakage, and further enhances the motor's transmission performance.

[0007] In addition, the dual-magnetic-field modulation magnetic gear composite motor provided by the present invention may also have the following additional technical features:

[0008] Furthermore, the permanent magnets are magnetized tangentially along the circumference, and the magnetization directions of adjacent permanent magnets are opposite.

[0009] Furthermore, the auxiliary magnetic adjustment ring is made of silicon steel sheets stamped and stacked, and is coaxially installed with the main body of the composite motor via a fixed shaft.

[0010] Furthermore, the drive shaft, fixed end cap, and fixed shaft are all made of non-magnetic materials.

[0011] Furthermore, the dual-magnetic-field modulated magnetic gear composite motor satisfies the following condition:

[0012] P o +P i =n s n s =n p ;

[0013] Among them, P o P is the number of pole pairs generated by the stator winding. i n is the number of pole pairs of the permanent magnet rotor. s n is the number of slots in the motor stator. p The number of adjusting pole pieces used to assist in adjusting the magnetic ring.

[0014] Furthermore, the three-phase windings are wound in the slots of the motor stator, driving the permanent magnet rotor to rotate, thereby transmitting power to the transmission shaft connected to the permanent magnet rotor. The transmission ratio i of the dual-magnetic-field modulated magnetic gear composite motor is: i = P i / P o .

[0015] 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

[0016] 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:

[0017] Figure 1 This is an exploded structural diagram of a dual-magnetic field modulated magnetic gear composite motor according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the assembly structure of a dual-magnetic field modulated magnetic gear composite motor according to an embodiment of the present invention;

[0019] Figure 3 This is a front structural schematic diagram of a dual magnetic field modulation magnetic gear composite motor according to an embodiment of the present invention.

[0020] Figure 4 This is a three-dimensional structural diagram of the auxiliary magnetic ring, permanent magnet rotor, and motor stator;

[0021] Figure 5 This is a cross-sectional structural diagram of the auxiliary magnetic ring, permanent magnet rotor, and motor stator. Detailed Implementation

[0022] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "up," "down," and similar expressions used herein are for illustrative purposes only and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., 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 communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0025] Please see Figures 1 to 3 An embodiment of the present invention proposes a dual-magnetic-field modulated magnetic gear composite motor, comprising a coaxially mounted transmission shaft 1, a fixed end cover 2, a permanent magnet rotor 5, a motor stator 9, an auxiliary magnetic adjustment ring 3, and a fixed shaft 12. The fixed shaft 12 is connected to the fixed end cover 2, and the fixed end cover 2 and the pole shoes 7 of the permanent magnet rotor 5 have interconnected screw holes, and the two are fixed by bolts and nuts; the motor stator 9 includes stator laminations 10 and magnetic adjustment blocks 11, and the motor stator 9 is composed of laminated silicon steel sheets stacked together, with the stator laminations 10 and magnetic adjustment blocks 11 integrated into one unit, and a main air gap 8 is provided between the permanent magnet rotor 5 and the motor stator 9; the auxiliary magnetic adjustment ring 3 is fixed inside the permanent magnet rotor 5 by the fixed shaft 12, and an auxiliary air gap 4 is provided between the auxiliary magnetic adjustment ring 3 and the permanent magnet rotor 5.

[0026] Please see Figure 4 and Figure 5 The main structure of this dual-magnetic-field modulated magnetic gear composite motor comprises three parts: an auxiliary magnetic adjusting ring 3, a permanent magnet rotor 5, and a motor stator 9. The auxiliary magnetic adjusting ring 3 is made of silicon steel sheets with good magnetic permeability, stamped and stacked, and coaxially mounted with the main body of the composite motor via a fixed shaft 12, forming an auxiliary air gap 4 with the permanent magnet rotor 5. By introducing the auxiliary magnetic adjusting ring 3, the magnetic circuit of the permanent magnet rotor 5 is effectively improved, leakage flux is reduced, and the transmission efficiency of the composite motor is increased.

[0027] Because the auxiliary adjusting ring 3 is located inside the permanent magnet rotor 5, its presence provides a closed path with low magnetic resistance for the magnetic flux of the permanent magnet rotor 5, guiding the magnetic flux leakage in its internal boundary to circulate between the permanent magnet 6 and the auxiliary adjusting ring 3. Therefore, effective harmonics appear in the main air gap 8 of this composite motor, transforming the originally leaked magnetic flux into useful harmonics, thereby increasing torque.

[0028] The permanent magnet rotor 5 includes permanent magnets 6 and pole shoes 7. The permanent magnets 6 in the rotor 5 have an embedded spoke structure, and the magnetization direction of the permanent magnets 6 is tangential along the circumference, with adjacent permanent magnets magnetized in opposite directions. The motor stator 9 is integrated with stator laminations 10 and a magnet adjusting block 11, thus making the main structure of the composite motor consist of only one main air gap 8 between the motor stator 9 and the permanent magnet rotor 5. This simplifies the overall structure of the composite motor, reduces losses caused by multiple air gaps, and improves the transmission performance of the composite motor.

[0029] Preferably, the drive shaft 1, the fixed end cover 2, and the fixed shaft 12 are all made of non-magnetic materials.

[0030] The above-mentioned dual-field modulated magnetic gear composite motor satisfies the following condition:

[0031] P o +P i =n s n s =n p ;

[0032] Among them, P o P is the number of pole pairs generated by the stator winding. i n is the number of pole pairs of the permanent magnet rotor 5. s n is the number of slots in stator 9 of the motor. p The number of adjusting pole pieces for auxiliary adjusting magnetic ring 3.

[0033] Specifically, the three-phase windings are wound in the slots of the motor stator 9, driving the permanent magnet rotor 5 to rotate, thereby transmitting power to the transmission shaft 1 connected to the permanent magnet rotor 5. The transmission ratio i of the dual-magnetic field modulated magnetic gear composite motor is: i = P i / P o .

[0034] Based on the aforementioned dual-magnetic-field modulated magnetic gear composite motor, the integration of the adjusting magnetic block and stator laminations reduces one air gap compared to traditional dual-air-gap magnetic gear composite motors. This effectively reduces magnetic resistance in the motor's magnetic circuit, thereby improving the motor's operating efficiency and power factor. Without the interference of multiple air-gap magnetic fields, the motor's output power is more stable and its reliability is higher. The use of an embedded spoke-type permanent magnet structure enhances the motor's torque performance, while the addition of an auxiliary adjusting magnetic ring improves the magnetic circuit of the permanent magnet rotor, reduces magnetic leakage, and further enhances the motor's transmission performance.

[0035] Compared to traditional magnetic gear composite motors, this invention reduces one air gap in the main structure by integrating the adjusting magnetic block and stator laminations. This effectively reduces magnetic resistance in the motor's magnetic circuit while making the motor structure more compact. By adding an auxiliary adjusting magnetic ring, leakage magnetic field in the permanent magnet rotor is effectively reduced, and useful magnetic field harmonics in the main air gap are amplified. This invention features high transmission efficiency, high torque density per unit volume, high reliability, and overload protection, making it widely applicable in new energy fields such as wind power generation, electric vehicles, and electric ships.

[0036] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," 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, the 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.

[0037] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A dual-magnetic-field modulation magnetic gear composite motor, characterized in that, The system includes a coaxially mounted drive shaft (1), a fixed end cover (2), a permanent magnet rotor (5), a motor stator (9), an auxiliary magnetic adjusting ring (3), and a fixed shaft (12). The fixed shaft (12) is connected to the fixed end cover (2). The fixed end cover (2) and the pole shoes (7) of the permanent magnet rotor (5) have interconnected screw holes. The fixed end cover (2) and the pole shoes (7) are fixed by bolts and nuts. The motor stator (9) includes stator laminations (10) and a magnetic adjusting block (11). The motor stator (9) is composed of laminated silicon steel sheets. The stator laminations (10) and the magnetic adjusting block (11) are... The magnetic adjustment block (11) is integrated into one unit. A main air gap (8) is provided between the permanent magnet rotor (5) and the motor stator (9). The auxiliary magnetic adjustment ring (3) is fixed inside the permanent magnet rotor (5) through a fixed shaft (12). An auxiliary air gap (4) is provided between the auxiliary magnetic adjustment ring (3) and the permanent magnet rotor (5). The permanent magnet (6) in the permanent magnet rotor (5) has an embedded spoke structure. The dual magnetic field modulation magnetic gear composite motor has a double air gap of main air gap (8) and auxiliary air gap (5). The permanent magnet rotor (5) is set inside the motor stator (9). The permanent magnet (6) is magnetized tangentially along the circumference and the magnetization directions of adjacent permanent magnets (6) are opposite. The dual-magnetic-field modulated magnetic gear composite motor satisfies the following condition: P o +P i =n s ,n s =n p ; Among them, P o P is the number of pole pairs generated by the stator winding. i n is the number of pole pairs of the permanent magnet rotor (5). s n is the number of slots in the motor stator (9). p The number of adjusting pole pieces for the auxiliary adjusting ring (3); The three-phase windings are wound in the slots of the motor stator (9) to drive the permanent magnet rotor (5) to rotate, thereby transmitting power to the transmission shaft (1) connected to the permanent magnet rotor (5). The transmission ratio i of the dual magnetic field modulated magnetic gear composite motor is: i = P i / P o .

2. The dual-magnetic-field modulation magnetic gear composite motor according to claim 1, characterized in that, The auxiliary magnetic ring (3) is made of silicon steel sheets stamped and stacked. The auxiliary magnetic ring (3) is coaxially installed with the main body of the composite motor through the fixed shaft (12).

3. The dual-magnetic-field modulation magnetic gear composite motor according to claim 1, characterized in that, The drive shaft (1), the fixed end cover (2), and the fixed shaft (12) are all made of non-magnetic materials.

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