Dual Magnetic Field Modulation Type Variable Speed Transmission Device of Integrated Magnetic Gear Composite Motor

Abstract

The present invention discloses a dual magnetic field modulation type variable speed transmission device integrating a magnetic gear composite motor, which includes an integrated drive system and a transmission system. The drive system consists of a motor stator and a motor rotor coaxially installed. The motor in the drive system is a field modulation permanent magnet motor. The motor stator is integrated by magnetic modulation blocks and motor stator teeth. The permanent magnets of the motor rotor adopt an embedded spoke type magnetic concentrating arrangement. The transmission system adopts a magnetic gear transmission with a non-uniform air gap. The transmission system includes an inner rotor, a magnetic modulation ring, and an outer rotor coaxially installed. The permanent magnets of the outer rotor of the transmission system adopt a salient pole structure. The permanent magnets of the outer rotor and the magnetic modulation ring form a non-uniform air gap. Among them, the motor rotor also serves as the inner rotor of the transmission system, so that the drive system and the transmission system are integrally combined. The present invention can solve the problem that the transmission efficiency drops sharply due to an excessively large transmission ratio of the magnetic gear transmission system.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a dual magnetic field modulation type variable speed transmission device of an integrated magnetic gear composite motor. Background Art

[0002] For traditional dual air-gap field modulation motors, since the magnetic field formed by their windings needs to pass through multiple air-gaps before coupling with the rotor permanent magnet magnetic field, the air-gap magnetic voltage drop is too high, resulting in a decrease in the overall efficiency. And due to the structural characteristics of multiple air-gaps, the existing magnetic gear composite motors are still relatively complex in structure. Therefore, it is necessary to further optimize the magnetic gear structure inside the composite motor, simplify its mechanical structure, reduce its manufacturing cost and improve its reliability during operation. Too complex mechanical and magnetic circuit structures will inevitably lead to an increase in losses of the magnetic gear composite motor, increase the operating cost of the magnetic gear composite motor, and reduce its engineering application value.

[0003] Traditional magnetic gear composite motors are usually composed of separately independent drive systems and transmission systems combined. The drive system is usually driven by a permanent magnet motor and does not have a variable speed function. The transmission system is a magnetic gear transmission. Since the permanent magnet motor cannot perform variable speed transmission, the transmission ratio of the magnetic gear in the transmission system is the transmission ratio of the magnetic gear composite motor. However, as the transmission ratio of the magnetic gear gradually increases, its transmission efficiency will drop sharply, thus affecting the overall performance of the magnetic gear composite motor. Summary of the Invention

[0004] The purpose of the present invention is to propose a dual magnetic field modulation type variable speed transmission device of an integrated magnetic gear composite motor to solve the problem that the transmission efficiency drops sharply due to too large a transmission ratio of the magnetic gear transmission system.

[0005] A dual magnetic field modulation type variable speed transmission device of an integrated magnetic gear composite motor includes an integrated drive system and a transmission system. The drive system is composed of a motor stator and a motor rotor coaxially installed. The motor in the drive system is a field modulation permanent magnet motor. The motor stator is integrated by magnetic modulation blocks and motor stator teeth. The permanent magnets of the motor rotor adopt an embedded spoke type magnetic concentrating arrangement; the transmission system adopts a magnetic gear transmission with a non-uniform air-gap. The transmission system includes an inner rotor, a magnetic modulation ring and an outer rotor coaxially installed. The permanent magnets of the outer rotor of the transmission system adopt a salient pole structure. The permanent magnets of the outer rotor and the magnetic modulation ring form a non-uniform air-gap. Among them, the motor rotor also serves as the inner rotor of the transmission system, so that the drive system and the transmission system are combined and integrated. The drive system and the transmission system are fixed to the frame by screws, the front end cover of the frame and the rear end cover of the frame. The output shaft of the composite motor is connected to the outer rotor.

[0006] The dual magnetic field modulation type variable speed transmission device of the integrated magnetic gear composite motor proposed according to the present invention integrates the driving system and the transmission system. Among them, the driving system adopts a field modulation permanent magnet motor, which is composed of a motor stator and a motor rotor coaxially installed. The motor stator is integrated with magnetic modulation blocks and motor stator teeth, reducing one layer of air gap while enabling magnetic field modulation, simplifying the mechanical structure of the motor and improving its torque density. The permanent magnets of the motor rotor are arranged in a spoke-shaped magnetic concentrating structure, which can effectively reduce magnetic leakage caused by multiple air gaps, simplify the mechanical structure of the motor and improve its torque density; the transmission system adopts magnetic gear transmission. The magnetic gear transmission system is composed of an inner rotor, a magnetic modulation ring and an outer rotor coaxially installed. Among them, the motor rotor also serves as the inner rotor of the transmission system, integrating the field modulation motor and the magnetic gear; the permanent magnets of the outer rotor are in a salient pole structure, with a non-uniform air gap structure with the magnetic modulation ring group, which helps to enhance the magnetic field modulation effect and thus helps to increase the output torque of the magnetic gear. In terms of the overall structure, different from the traditional magnetic gear composite motor, both the driving system and the transmission system in this application have the function of variable speed transmission, effectively solving the problem that the transmission efficiency of the magnetic gear transmission system drops sharply due to an excessive transmission ratio.

[0007] In addition, the dual magnetic field modulation type variable speed transmission device of the integrated magnetic gear composite motor provided according to the present invention may also have the following additional technical features:

[0008] Furthermore, the motor stator is integrated with stator teeth and a magnetic modulation ring. The motor in the driving system is a field modulation permanent magnet motor, and its motor stator is integrated with stator teeth and a magnetic modulation ring, reducing one layer of air gap between the stator and the magnetic modulation ring, effectively reducing magnetic leakage caused by multiple air gaps, simplifying the mechanical structure of the motor and improving its torque density.

[0009] Furthermore, the number of stator slots Z, the number of pole pairs P of the armature winding 1 and the number of pole pairs P of the permanent magnets of the motor rotor 2 satisfy the conditional formula:

[0010] P 1 + P 2 = Z.

[0011] Furthermore, the permanent magnets of the motor rotor are all magnetized tangentially along the circumference, and the magnetization directions of adjacent permanent magnets are opposite. The permanent magnets of the motor rotor adopt an embedded spoke-shaped magnetic concentrating arrangement, that is, the permanent magnets of the motor rotor are all magnetized tangentially along the circumference, and the magnetization directions of adjacent permanent magnets are opposite. The permanent magnets of the embedded spoke-shaped structure can enhance the overall mechanical strength of the rotor. At the same time, the arrangement of the permanent magnets can produce a magnetic concentrating effect, which can increase the torque density of the motor and improve the air gap magnetic density.

[0012] Furthermore, the motor stator is fixed and supported on the frame through the main shaft; the motor rotor is supported on the main shaft through bearings.

[0013] Furthermore, the outer rotor permanent magnets are radially magnetized and the magnetization directions of adjacent permanent magnets are opposite. The outer rotor permanent magnets and the magnetic modulation ring in the drive system form a non-uniform air gap, and this structure can improve the air gap magnetic density and thus enhance the transmission performance of the drive device.

[0014] Furthermore, in order to reduce the losses caused by eddy currents, the magnetic modulation ring in the drive system is laminated by silicon steel sheets; the magnetic modulation ring is composed of magnetic modulation blocks with connecting bridges added. In order to reduce the influence of the added connecting bridges on its torque, the magnetic modulation ring of the magnetic gear variable speed drive adopts an internal connecting bridge structure.

[0015] Furthermore, the number of pole pairs P of the permanent magnets of the motor rotor 2 and the number of pole pairs P of the outer rotor permanent magnets o and the number N of magnetic modulation blocks in the drive system satisfy the conditional formula:

[0016] P 2 +P o =N.

[0017] Furthermore, the magnetic modulation ring in the drive system is fixed and is fixedly supported on the main shaft through the front end cover and the rear end cover of the magnetic modulation ring; the front end cover of the outer rotor is supported on the main shaft through a bearing, and the rear end cover of the outer rotor is connected to the output shaft of the composite motor.

[0018] Furthermore, when the stator winding is energized, the winding will generate a magnetic field with a pole pair number of P 1 that rotates uniformly around the central axis. The generated magnetic field is modulated by the stator teeth and the magnetic modulation ring and is coupled with the magnetic fields with different pole pair numbers generated by the motor rotor at the air gap, thereby driving the motor rotor to rotate. The magnetic field with a pole pair number of P 2 generated by the permanent magnets of the motor rotor is modulated by the magnetic modulation ring of the drive system and is coupled with the outer rotor, thereby driving the outer rotor to rotate, realizing the two-speed function of double magnetic field modulation.

[0019] The additional aspects and advantages of the present invention will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0021] Figure 1 is an exploded structural schematic diagram of a double magnetic field modulation type variable speed drive device of an integrated magnetic gear composite motor provided by an embodiment of the present invention;

[0022] Figure 2 is an assembled structural schematic diagram of a double magnetic field modulation type variable speed drive device of an integrated magnetic gear composite motor provided by an embodiment of the present invention;

[0023] Figure 3 is Figure 1 a schematic structural diagram of the inner and outer rotor permanent magnets;

[0024] Figure 4 is a front cross-sectional view after assembly of the dual magnetic field modulation type speed change transmission device of the integrated magnetic gear composite motor provided by an embodiment of the present invention;

[0025] Figure 5 is a side cross-sectional view after assembly of the dual magnetic field modulation type speed change transmission device of the integrated magnetic gear composite motor provided by an embodiment of the present invention. Detailed Embodiments

[0026] In order to make the objectives, features, and advantages of the present invention more obvious and understandable, the following provides a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. Several embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0027] 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 can also be a middle 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 a middle element at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down" and similar expressions used herein are only for the purpose of illustration and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0028] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0029] Please refer to Figures 1 to 5, the dual magnetic field modulation type variable speed drive device of the integrated magnetic gear composite motor proposed by an embodiment of the present invention includes a drive system and a transmission system. The drive system consists of a motor stator 7 and a motor rotor 8 coaxially installed; the transmission system uses magnetic gear transmission and is composed of an inner rotor, a magnetic modulation ring 9, and an outer rotor 11 coaxially installed. Among them, the motor rotor 8 also serves as the inner rotor of the transmission system, making the drive and transmission systems composite. The motor rotor 8 is installed between the front end cover 6 of the motor rotor and the rear end cover 13 of the motor rotor.

[0030] The drive system and the transmission system are fixed to the frame 3 through screws 2, the front end cover 1 of the frame, and the rear end cover 16 of the frame. The output shaft 17 of the composite motor is connected to the outer rotor 11. The motor in the drive system is a field modulation permanent magnet motor. Its motor stator 7 is integrated with stator teeth and a magnetic modulation ring, reducing an air gap layer between the stator and the magnetic modulation ring, effectively reducing magnetic leakage caused by multiple air gaps, simplifying the mechanical structure of the motor, and improving its torque density. The number of stator slots Z, the number of pole pairs P of the armature winding 1 and the number of pole pairs P of the permanent magnets on the motor rotor 2 satisfy the conditional formula:

[0031] P 1 +P 2 =Z.

[0032] Please refer to Figure 3 emphatically. The permanent magnets 10 on the outer rotor of the transmission system adopt a salient pole structure. The permanent magnets 10 on the outer rotor are all radially magnetized and the magnetization directions of adjacent permanent magnets are opposite. The permanent magnets 10 on the outer rotor and the magnetic modulation ring 9 in the transmission system form a non-uniform air gap. This structure can improve the air gap magnetic density and thus improve the transmission performance of the drive device. In order to reduce the loss caused by eddy currents, the magnetic modulation ring 9 in the transmission system is laminated with silicon steel sheets; the magnetic modulation ring 9 is composed of magnetic modulation blocks with connecting bridges added. In order to reduce the influence of the added connecting bridges on its torque, the magnetic modulation ring 9 of the magnetic gear variable speed drive adopts an inner connecting bridge structure.

[0033] Please refer to Figure 4 emphatically. The permanent magnets on the motor rotor adopt an embedded spoke type magnetic concentrating arrangement method, that is, the permanent magnets on the motor rotor 8 are all magnetized tangentially along the circumference, and the magnetization directions of adjacent permanent magnets are opposite. The permanent magnets with an embedded spoke type structure can enhance the overall mechanical strength of the rotor. At the same time, the arrangement method of the permanent magnets can generate a magnetic concentrating effect, improve the torque density of the motor, and improve the air gap magnetic density. The motor stator 7 is fixed and supported on the frame 3 through the main shaft 18; the motor rotor 8 is supported on the main shaft 18 through the bearing 12. The inner rotor of the transmission system is the motor rotor 8, that is, the motor rotor 8 of the drive system and the inner rotor of the transmission system are integrated, thus forming the structure of the magnetic gear composite motor. The number of pole pairs P of the permanent magnets on the motor rotor 2 , the number of pole pairs P of the permanent magnets 10 on the outer rotor of the transmission system oIt is necessary to satisfy the basic principle of magnetic field modulation with the number N of magnetic modulation blocks in the drive system, and satisfy the conditional formula:

[0034] P 2 +P o =N.

[0035] Please refer specifically to Figure 5 , the magnetic modulation ring 9 in the drive system is fixed, and is fixedly supported on the main shaft 18 through the front end cover 5 and the rear end cover 14 of the magnetic modulation ring; the front end cover 4 of the outer rotor is supported on the main shaft 18 through the bearing 12, and the rear end cover 15 of the outer rotor is connected to the output shaft 17 of the composite motor. When the stator winding is energized, the winding will generate a magnetic field with a pole pair number P that rotates uniformly around the central axis 1 . The generated magnetic field is modulated by the stator tooth magnetic modulation ring and coupled with the magnetic fields of different pole pair numbers generated by the motor rotor 8 at the air gap, thereby driving the motor rotor 8 to rotate. The magnetic field generated by the permanent magnet of the motor rotor has a pole pair number P 2 . The magnetic field is modulated by the magnetic modulation ring 9 of the drive system and coupled with the outer rotor 11 of the drive system, thereby driving the outer rotor 11 to rotate. Different from the traditional magnetic gear composite motor, in the proposed structure, both the drive system and the drive system have the function of variable speed drive, effectively preventing the situation that the drive efficiency drops sharply due to the too large transmission ratio of the drive system.

[0036] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0037] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A dual magnetic field modulation type variable speed transmission device integrated with a magnetic gear composite motor, characterized in that, it includes an integrated drive system and a transmission system. The drive system is composed of a motor stator (7) and a motor rotor (8) coaxially installed. The motor in the drive system is a field modulation permanent magnet motor. The motor stator (7) integrates magnetic modulation blocks and motor stator teeth into one body. The permanent magnets of the motor rotor (8) adopt an embedded spoke type magnetic concentration arrangement; the transmission system adopts a magnetic gear transmission with non-uniform air gaps. The transmission system includes an inner rotor, a magnetic modulation ring (9), and an outer rotor (11) coaxially installed. The permanent magnets (10) of the outer rotor of the transmission system adopt a salient pole structure. The permanent magnets (10) of the outer rotor and the magnetic modulation ring (9) form a non-uniform air gap. Among them, the motor rotor (8) also serves as the inner rotor of the transmission system, enabling the drive system and the transmission system to be integrally combined. The drive system and the transmission system are fixed to the frame (3) by screws (2), the front end cover (1) of the frame, and the rear end cover (16) of the frame. The output shaft (17) of the composite motor is connected to the outer rotor (11); the motor stator (7) integrates stator teeth and a magnetic modulation ring; the permanent magnets of the motor rotor (8) are magnetized tangentially along the circumference, and the magnetization directions of adjacent permanent magnets are opposite.

2. The dual magnetic field modulation type variable speed transmission device integrated with a magnetic gear composite motor according to claim 1, characterized in that, The number of stator slots Z, the number of pole pairs P of the armature winding 1 and the number of pole pairs P of the permanent magnets of the motor rotor (8) 2 satisfy the conditional expression: P 1 +P 2 = Z.

3. The dual magnetic field modulation type variable speed transmission device integrated with a magnetic gear composite motor according to claim 1, characterized in that, the motor stator (7) is fixed and supported on the frame (3) through the main shaft (18); the motor rotor (8) is supported on the main shaft (18) through the bearing (12).

4. The dual magnetic field modulation type variable speed transmission device integrated with a magnetic gear composite motor according to claim 1, characterized in that, the permanent magnets (10) of the outer rotor are radially magnetized and the magnetization directions of adjacent permanent magnets are opposite.

5. The dual magnetic field modulation type variable speed transmission device integrated with a magnetic gear composite motor according to claim 4, characterized in that, the magnetic modulation ring (9) is laminated by silicon steel sheets, and the magnetic modulation ring (9) adopts an inner connection bridge structure.

6. The dual magnetic field modulation type variable speed transmission device integrated with a magnetic gear composite motor according to claim 5, characterized in that, The number of pole pairs P of the permanent magnets of the motor rotor (8) 2 and the number of pole pairs P of the outer rotor permanent magnets (10) o and the number N of magnetic flux adjusting blocks of the drive system satisfy the conditional formula: P 2 +P o = N.

7. The dual magnetic field modulation type variable speed transmission device integrated with a magnetic gear composite motor according to claim 1, characterized in that, the magnetic modulation ring (9) in the transmission system is fixed and immovable, and is fixedly supported on the main shaft (18) through the front end cover (5) of the magnetic modulation ring and the rear end cover (14) of the magnetic modulation ring; the front end cover (4) of the outer rotor is supported on the main shaft (18) through the bearing (12), and the rear end cover (15) of the outer rotor is connected to the output shaft (17) of the composite motor.

8. The dual magnetic field modulation type variable speed transmission device integrated with a magnetic gear composite motor according to any one of claims 1 to 7, characterized in that, When the stator winding is energized, the winding generates a magnetic field with a pole pair number of P that rotates uniformly around the central axis. 1 The generated magnetic field is modulated by the stator tooth magnetic modulation ring and coupled with the magnetic fields of different pole pair numbers generated by the motor rotor (8) at the air gap, thereby driving the motor rotor (8) to rotate. The magnetic field with a pole pair number of P generated by the permanent magnet of the motor rotor (8) 2 is modulated by the transmission system magnetic modulation ring (9) and coupled with the outer rotor (11), thereby driving the outer rotor (11) to rotate, realizing the two-speed function of double magnetic field modulation.

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