Integrated device of axial magnetic coupler and driver

Abstract

The utility model discloses an integrated device of an axial magnetic coupler and a driver, which comprises a magnetic coupling driving rotor and a driving motor, the magnetic coupling driving rotor is arranged in a casing of the driving motor and is fixedly connected with a motor shaft of the driving motor, and the magnetic coupling driving rotor is arranged in the casing of the driving motor. When the driving motor drives the motor shaft to rotate to do work, the magnetic coupling driving rotor is driven to rotate to transmit magnetic torque. Wherein the driving motor is an axial magnetic flux motor. According to the utility model, the magnetic coupling active rotor is highly integrated in the driving motor, and the driving motor adopts an axial magnetic flux motor with smaller volume and lighter weight, so that the volume and the weight are greatly reduced, and the energy density and the efficiency of the magnetic coupler can be improved; and meanwhile, the compactness, the transmission efficiency, the stability, the reliability and the like are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic couplers, and particularly relates to an integrated device of an axial magnetic coupler and a driver. Background Art

[0002] In the modern industrial and medical fields, the drive system is a key part of the operation of various devices. With the continuous progress of technology, the requirements for the performance, efficiency, reliability, etc. of the drive system are also increasing day by day. As an advanced transmission technology, a magnetic coupler generally drives an active rotor by a motor, couples another passive rotor, and realizes non-contact power transmission through magnetic force. As the core power source of the drive system, the performance of the drive motor and its cooperation with other components are crucial.

[0003] At present, magnetic couplers are generally externally placed outside the drive motor, and the two are connected by a transmission shaft, and the integration degree is often not ideal. For example, a Halbach array double-cylinder adjustable-speed magnetic coupler disclosed in a Chinese patent application with publication number CN109412385A and publication date of March 1, 2019, in which the servo motor drives a slide rod with left and right threads to rotate through a speed reducer, thereby driving a cylindrical slider with internal threads to move left and right, and making the inner and outer rotors connected by the cylindrical ring move left and right. The existing combination method of such a motor and a magnetic coupler will obviously lead to low space utilization rate of the entire drive system, large volume, heavy structure, limited application range, and inability to meet the requirements of some specific use occasions such as the external drive of a ventricular assist device. Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Summary of the Utility Model

[0004] The problem to be solved by the utility model is to provide an integrated device of an axial magnetic coupler and a driver to overcome the defects that the existing magnetic coupling drive structure has low integration degree, large volume and weight, resulting in inability to meet the use requirements.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an integrated device of an axial magnetic coupler and a driver, comprising: a magnetic coupling active rotor and a drive motor, the magnetic coupling active rotor is arranged inside the housing of the drive motor and is fixedly connected to the motor shaft of the drive motor, and when the drive motor drives the motor shaft to rotate and do work, it drives the magnetic coupling active rotor to rotate to transmit magnetic torque; wherein, the drive motor adopted is an axial-flux motor.

[0006] As a further improvement of the present utility model, the casing includes a magnetic shielding sleeve, a magnetic shielding end cover, a magnetic leakage end cover, and a magnetic shielding partition. The magnetic shielding end cover and the magnetic leakage end cover are respectively fixedly covered at both ends of the magnetic shielding sleeve. The magnetic shielding partition is fixed inside the magnetic shielding sleeve and divides the inner cavity of the magnetic shielding sleeve into two chambers. The magnetic coupling active rotor is accommodated in the chamber between the magnetic shielding partition and the magnetic leakage end cover.

[0007] As a further improvement of the present utility model, the magnetic coupling active rotor includes a rotor magnetic core with a disc structure. One end face of the rotor magnetic core is arranged opposite to the magnetic leakage end cover for axially magnetic coupling with an external magnetic coupling passive rotor.

[0008] As a further improvement of the present utility model, the rotor magnetic core is annular and is formed by arranging a plurality of permanent magnets in a Halbach array.

[0009] As a further improvement of the present utility model, the plurality of permanent magnets are evenly divided into a number of first magnetic pieces and a number of second magnetic pieces that are both sector-annular. The first magnetic pieces are magnetized along the axis direction of the rotor magnetic core, and the second magnetic pieces are magnetized along the circumferential direction of the rotor magnetic core. The first magnetic pieces and the second magnetic pieces are alternately arranged and spliced along the circumferential direction to form the annular rotor magnetic core. Taking the end face of the rotor magnetic core facing the magnetic leakage end cover as the front face, the adjacent magnetic polarities of the first magnetic piece and the second magnetic piece shown on the front face are the same, while the adjacent magnetic polarities of the first magnetic piece and the second magnetic piece shown on the back face are different.

[0010] As a further improvement of the present utility model, the magnetic coupling active rotor further includes a rotor protection ring made of a non-ferrous metal material, and the rotor protection ring is coated on the outer peripheral surface of the rotor magnetic core.

[0011] As a further improvement of the present utility model, the magnetic coupling active rotor further includes a magnetic shielding cover, and the magnetic shielding cover covers the rotor magnetic core and exposes one end face of the rotor magnetic core facing the magnetic leakage end cover.

[0012] As a further improvement of the present utility model, the drive motor includes a stator and a rotor that are both of a disc structure. The stator and the rotor are arranged axially opposite to each other and are both accommodated in the chamber between the magnetic shielding partition and the magnetic shielding end cover.

[0013] As a further improvement of the present utility model, the motor shaft is arranged along the axis inside the casing and is fixedly connected to the rotor, and bearings are installed between the motor shaft and the magnetic shielding end cover and the magnetic shielding partition respectively.

[0014] As a further improvement of the present utility model, the magnetic shielding sleeve, the magnetic shielding end cap, and the magnetic shielding partition are all made of ferromagnetic materials, and the magnetic leakage end cap is made of a non-magnetic and non-conductive hard insulating material.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. The present utility model provides an integrated device of an axial magnetic coupler and a driver. By highly integrating the magnetic coupling active rotor inside the driving motor, and using an axial flux motor with a smaller volume and lighter weight for the driving motor, this integrated device can give full play to the respective advantages of the axial magnetic coupler and the driving motor. Through optimized design and reasonable integration, the problems existing in the prior art are solved. It not only greatly reduces the volume and weight, but also can improve the energy density and efficiency of the magnetic coupler. At the same time, there are also great improvements in aspects such as compactness, transmission efficiency, stability, and reliability, making it possible for this integrated device of the axial magnetic coupler and the driver to be applied in some specific usage scenarios such as the external drive of ventricular assist devices.

[0017] 2. The magnetic coupling active rotor in the present utility model adopts a safe axial coupling method, and secondary shielding is carried out on the radial and back sides of the magnetic coupling active rotor, which can improve electromagnetic compatibility and safety. At the same time, a rotor protection ring is also coated on the outside of the magnetic coupling active rotor, which can play a role in isolating magnetic fields and protecting the magnetic circuit.

[0018] 3. The present utility model uses a magnetic leakage end cap as the cover of the coupling surface of the magnetic coupling active rotor, which can make the axial magnetic field of the magnetic coupling active rotor unobstructed, improve the axial magnetic coupling efficiency, and can reduce the eddy current heating and power consumption generated during magnetic force transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic cross-sectional structure diagram of the integrated device of the axial magnetic coupler and the driver of the present utility model;

[0020] Figure 2 is a three-dimensional view of one embodiment of the rotor core of the integrated device of the axial magnetic coupler and the driver of the present utility model;

[0021] Figure 3 is a three-dimensional view of another embodiment of the rotor core of the integrated device of the axial magnetic coupler and the driver of the present utility model;

[0022] Figure 4 is a three-dimensional view of yet another embodiment of the rotor core of the integrated device of the axial magnetic coupler and the driver of the present utility model.

[0023] The following description is made in conjunction with the attached drawings:

[0024] 1. Magnetically coupled active rotor; 101. Rotor core; 1011. First magnetic sheet;

[0025] 1012. Second magnetic sheet; 102. Rotor protection ring; 103. Magnetic shielding cover; 2. Driving motor; 201. Housing; 2011. Magnetic shielding sleeve; 2012. Magnetic shielding end cover; 2013. Leakage magnetic end cover; 2014. Magnetic shielding partition; 202. Motor shaft; 203. Stator; 204. Rotor; 205. Bearing. Specific embodiments

[0026] The following will describe in detail the preferred embodiments of the present invention with reference to the accompanying drawings.

[0027] Refer to Figure 1 , the present invention provides an integrated device of an axial magnetic coupler and a driver, including: a magnetically coupled active rotor 1 and a driving motor 2. The driving motor 2 includes a housing 201 and a motor shaft 202 rotatably disposed in the housing 201. The magnetically coupled active rotor 1 is disposed in the housing 201 of the driving motor 2 and is fixedly connected to the motor shaft 202 of the driving motor 2. When the driving motor 2 drives the motor shaft 202 to rotate and do work, it drives the magnetically coupled active rotor 1 to rotate to transmit magnetic force torque.

[0028] It should be particularly emphasized that the driving motor 2 in the present invention is an axial flux motor, which is flat disk-shaped. Compared with the traditional radial flux motor, it has a smaller volume and lighter weight, and can provide high torque density and power density, ensuring that the magnetically coupled active rotor 1 effectively transmits magnetic force torque, and is also more easily highly integrated with the magnetically coupled active rotor 1.

[0029] By highly integrating the magnetically coupled active rotor 1 in the driving motor 2, and the driving motor 2 adopts an axial flux motor with a smaller volume and lighter weight, this integrated device can give full play to the respective advantages of the axial magnetic coupler and the driving motor 2. Through optimized design and reasonable integration, the problems existing in the prior art are solved. Not only the volume and weight are greatly reduced, but also the energy density and efficiency of the magnetic coupler can be improved. At the same time, there are also great improvements in terms of compactness, transmission efficiency, stability and reliability, making it possible for this integrated device of the axial magnetic coupler and the driver to be applied in some specific use occasions such as the external drive of ventricular assist devices.

[0030] It should be noted that the axial flux motor adopted by the drive motor 2 is a prior art, and the specific structural forms include but are not limited to single stator single rotor, single stator double rotor, double stator single rotor and multi-stator multi-rotor axial flux motors. For example, an axial flux motor disclosed in a Chinese patent application for invention with a publication number of CN108736602A and a publication date of November 2, 2018, and another axial flux motor disclosed in a Chinese patent application for invention with a publication number of CN107408875A and a publication date of November 28, 2017.

[0031] In the present utility model, the housing 201 includes a magnetic shielding sleeve 2011, a magnetic shielding end cover 2012, a magnetic leakage end cover 2013 and a magnetic shielding partition 2014. The magnetic shielding sleeve 2011 is in the shape of a cylinder with both ends open, and the magnetic shielding end cover 2012 and the magnetic leakage end cover 2013 are respectively fixedly covered at both ends of the magnetic shielding sleeve 2011. Among them, the magnetic shielding end cover 2012 and the magnetic shielding sleeve 2011 can be integrally formed or have a split structure, and the fixing method between the magnetic shielding end cover 2012, the magnetic leakage end cover 2013 and the magnetic shielding sleeve 2011 can adopt interference fit, welding, etc.

[0032] Furthermore, the magnetic shielding partition 2014 is fixed inside the magnetic shielding sleeve 2011 by the same fixing method as above, and the magnetic shielding partition 2014 is parallel between the magnetic shielding end cover 2012 and the magnetic leakage end cover 2013 to divide the inner cavity of the magnetic shielding sleeve 2011 into two chambers; the magnetically coupled active rotor 1 is accommodated in the chamber between the magnetic shielding partition 2014 and the magnetic leakage end cover 2013, and the stator 203 and the rotor 204 of the drive motor 2 are accommodated in the chamber between the magnetic shielding partition 2014 and the magnetic shielding end cover 2012.

[0033] The drive motor 2 in this embodiment adopts an axial flux motor with a double stator single rotor structural form, that is, the drive motor 2 includes two stators 203 and one rotor 204, both of which are in a disc structure. The rotor 204 is located between the two stators 203 and is axially oppositely arranged. When current passes through the windings of the stator 203, the generated magnetic field passes through the rotor 204 along the axial direction. According to the Lorentz force law, the magnetic field generated by the stator 203 will generate a torque in the rotor 204, thereby driving the rotor 204 to rotate.

[0034] Among them, the motor shaft 202 is arranged along the axis inside the machine housing 201, and the motor shaft 202 is coaxially and fixedly inserted into the central hole of the rotor 204; one end of the motor shaft 202 extending out of the rotor 204 is installed on the magnetic shielding end cover 2012 through a bearing 205, and the other end of the motor shaft 202 passes through the magnetic shielding partition 2014 and extends into the chamber and is fixedly connected to the magnetic coupling active rotor 1. Another bearing 205 is also installed between the middle of the motor shaft 202 and the magnetic shielding partition 2014. The integrated structure is adopted in the present utility model. Since the magnetic coupling active rotor 1 is directly fixed on the motor shaft 202 of the driving motor 2 without using an additional transmission shaft, the overall structure is more compact and the performance is stable and reliable.

[0035] In the traditional radial magnetic coupling method, the rotor is prone to emit an alternating magnetic field that rotates divergently into space, making it difficult to effectively shield, easily interacting with the external environment, having safety hazards in applications, and having low transmission efficiency. In the present utility model, the magnetic coupling active rotor 1 includes a rotor magnetic core 101 with a disc structure. One end face of the rotor magnetic core 101 is arranged opposite to the magnetic leakage end cover 2013 for end-to-end axial magnetic coupling with the external magnetic coupling passive rotor to achieve magnetic torque transmission, and the problems existing in the above-mentioned prior art using the radial magnetic coupling method can be avoided.

[0036] The rotor magnetic core 101 in the present utility model is annular and is formed by arranging a plurality of permanent magnets in a Halbach array.

[0037] For the convenience of understanding, it is defined that one end face of the rotor magnetic core 101 facing the magnetic leakage end cover 2013 is the front face, and the end face opposite to it is the back face.

[0038] Specifically, the plurality of permanent magnets are evenly divided into a number of first magnetic sheets 1011 and a number of second magnetic sheets 1012 that are both fan-shaped rings. The plurality of first magnetic sheets 1011 are magnetized along the axis direction of the rotor magnetic core 101 so that the magnetic poles of the first magnetic sheets 1011 are distributed on the front and back faces of the rotor magnetic core 101; the plurality of second magnetic sheets 1012 are magnetized along the circumferential direction of the rotor magnetic core 101 so that the magnetic poles of the second magnetic sheets 1012 are distributed on the two side ends that are in contact with the first magnetic sheets 1011 on both sides. The plurality of first magnetic sheets 1011 and the plurality of second magnetic sheets 1012 are alternately arranged and spliced along the circumferential direction to form an annular rotor magnetic core 101, and the adjacent magnetic polarities of the first magnetic sheets 1011 and the second magnetic sheets 1012 shown on the front face are the same, while the adjacent magnetic polarities of the first magnetic sheets 1011 and the second magnetic sheets 1012 shown on the back face are different.

[0039] Among them, the number of the first magnetic sheets 1011 and the second magnetic sheets 1012 is both 2 n pieces, and n is a natural number greater than or equal to 1. Figures 2 to 4They respectively represent the three-dimensional views of the rotor core 101 when n = 1, 2, and 3.

[0040] By adopting this Halbach array arrangement in the present utility model, magnetic field lines can be concentrated on the front side of the rotor core 101, i.e., the coupling end side, to increase the magnetic induction intensity. On the other side opposite to it, the magnetic field lines are weakened and hardly show magnetism. In this way, the energy density of the rotor core 101 can be increased, and the magnetic coupling transfer efficiency can be further improved.

[0041] Of course, there are various Halbach array methods, not limited to the several examples given in this embodiment. Without departing from the scope of the technical solution of the present utility model, adopting different Halbach array methods still fall within the scope protected by the technical solution of the present utility model.

[0042] Furthermore, the magnetic coupling active rotor 1 further includes a rotor protection ring 102, which is coated on the outer circumferential surface of the rotor core 101. The rotor protection ring 102 is made of non-ferrous metal materials, such as lightweight metals like aluminum alloy and titanium alloy, which can play a role in isolating magnetism and protecting the magnetic circuit.

[0043] In addition, the magnetic coupling active rotor 1 further includes a magnetic shielding cover 103, which is in the shape of a round bowl. It covers the back of the rotor core 101 and the outer circumferential surface of the rotor protection ring 102, and makes one end face of the rotor core 101 facing the magnetic leakage end cover 2013 exposed. The material used for the magnetic shielding cover 103 is a ferromagnetic material, which can effectively shield the back and radial side surfaces of the rotor core 101.

[0044] It is worth noting that the magnetic shielding sleeve 2011, the magnetic shielding end cover 2012, and the magnetic shielding partition 2014 in the present utility model are all made of ferromagnetic materials. On the one hand, they can provide magnetic shielding protection for the driving motor 2. On the other hand, they can play a secondary magnetic shielding role for the radial magnetic leakage of the magnetic coupling active rotor 1. At the same time, they can also prevent the driving motor 2 and the magnetic coupling active rotor 1 from affecting each other, improving the electromagnetic compatibility and safety. The magnetic leakage end cover 2013 in the present utility model is made of a non-magnetic and non-conductive hard insulating material, including but not limited to ceramic materials, such as metal oxide ceramics like silicon carbide, silicon nitride, zirconium oxide, and aluminum oxide. On the one hand, it can make the magnetic field of the magnetic coupling active rotor 1 unobstructed axially, facilitating magnetic coupling. On the other hand, it can reduce the eddy current heating and power consumption generated during magnetic force transmission.

[0045] It can be seen that for the integrated device of an axial magnetic coupler and a driver of the present utility model, by highly integrating the magnetic coupling active rotor 1 inside the drive motor 2, and the drive motor 2 being an axial-flux motor with a smaller volume and lighter weight, such an integrated device can give full play to the respective advantages of the axial magnetic coupler and the drive motor 2. Through optimized design and reasonable integration, the problems existing in the prior art are solved. Not only is the volume and weight greatly reduced, but also the energy density and efficiency of the magnetic coupler can be improved. At the same time, there are also great improvements in aspects such as compactness, transmission efficiency, stability and reliability, making it possible for the integrated device of the axial magnetic coupler and the driver to be used in some specific applications such as the extracorporeal drive of ventricular assist devices. At the same time, the magnetic coupling active rotor 1 in the present utility model adopts a safe axial coupling method, and secondary shielding is carried out on the radial and back sides of the magnetic coupling active rotor 1, which can improve electromagnetic compatibility and safety. Moreover, a rotor protection ring 102 is covered on the outside of the magnetic coupling active rotor 1, which can play a role in isolating magnetism and protecting the magnetic circuit. Further, the present utility model uses a magnetic leakage end cover 2013 as the cover of the coupling surface of the magnetic coupling active rotor 1, which can make the axial magnetic field of the magnetic coupling active rotor 1 unobstructed, improve the axial magnetic coupling efficiency, and can reduce the eddy current heating and power consumption generated during magnetic force transmission.

[0046] Many specific details are set forth in the above description in order to provide a thorough understanding of the present utility model. However, the above description is only a preferred embodiment of the present utility model, and the present utility model can be implemented in many other ways different from those described herein. Therefore, the present utility model is not limited by the specific implementations disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present utility model, or modify it into an equivalent embodiment with equivalent changes. All simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. An integrated device of an axial magnetic coupler and a driver, characterized in that, Comprising: A magnetically coupled active rotor (1) and a drive motor (2), wherein the magnetically coupled active rotor (1) is arranged inside the housing (201) of the drive motor (2) and is fixedly connected to the motor shaft (202) of the drive motor (2). When the drive motor (2) drives the motor shaft (202) to rotate and do work, it drives the magnetically coupled active rotor (1) to rotate to transmit magnetic torque; among them, the drive motor (2) is an axial flux motor.

2. The integrated device of an axial magnetic coupler and a driver according to claim 1, characterized in that: The housing (201) includes a magnetic shielding sleeve (2011), a magnetic shielding end cover (2012), a magnetic leakage end cover (2013), and a magnetic shielding partition (2014). The magnetic shielding end cover (2012) and the magnetic leakage end cover (2013) are respectively fixedly covered at both ends of the magnetic shielding sleeve (2011). The magnetic shielding partition (2014) is fixed inside the magnetic shielding sleeve (2011) and divides the inner cavity of the magnetic shielding sleeve (2011) into two chambers. The magnetically coupled active rotor (1) is accommodated in the chamber between the magnetic shielding partition (2014) and the magnetic leakage end cover (2013).

3. The integrated device of an axial magnetic coupler and a driver according to claim 2, characterized in that: The magnetically coupled active rotor (1) includes a rotor core (101) with a disc structure. One end face of the rotor core (101) is arranged opposite to the magnetic leakage end cover (2013) for axial magnetic coupling with an external magnetically coupled passive rotor.

4. The integrated device of an axial magnetic coupler and a driver according to claim 3, characterized in that: The rotor core (101) is annular and is formed by arranging a plurality of permanent magnets in a Halbach array.

5. The integrated device of an axial magnetic coupler and a driver according to claim 4, characterized in that: The plurality of permanent magnets are evenly divided into a number of first magnetic pieces (1011) and a number of second magnetic pieces (1012) that are both fan-shaped and have the same quantity. The plurality of first magnetic pieces (1011) are all magnetized along the axis direction of the rotor core (101), and the plurality of second magnetic pieces (1012) are all magnetized along the circumferential direction of the rotor core (101). The plurality of first magnetic pieces (1011) and the plurality of second magnetic pieces (1012) are alternately arranged and spliced along the circumferential direction to form the annular rotor core (101). Taking the end face of the rotor core (101) facing the magnetic leakage end cover (2013) as the front face, the magnetic polarities of the adjacent first magnetic pieces (1011) and second magnetic pieces (1012) shown on the front face are the same, while the magnetic polarities of the adjacent first magnetic pieces (1011) and second magnetic pieces (1012) shown on the back face are different.

6. The integrated device of an axial magnetic coupler and a driver according to claim 3, characterized in that: The magnetically coupled active rotor (1) further includes a rotor protection ring (102) made of a non-ferrous metal material, and the rotor protection ring (102) is coated on the outer peripheral surface of the rotor core (101).

7. The integrated device of an axial magnetic coupler and a driver according to claim 3, characterized in that: The magnetically coupled active rotor (1) further includes a magnetic shielding cover (103), and the magnetic shielding cover (103) covers the rotor core (101) and exposes one end face of the rotor core (101) facing the magnetic leakage end cover (2013).

8. The integrated device of an axial magnetic coupler and a driver according to claim 2, characterized in that: The driving motor (2) includes a stator (203) and a rotor (204) both of which are of disc structures. The stator (203) and the rotor (204) are arranged axially opposite to each other and are both accommodated in a chamber between the magnetic shielding partition (2014) and the magnetic shielding end cover (2012).

9. The integrated device of an axial magnetic coupler and a driver according to claim 8, characterized in that: The motor shaft (202) is arranged along the axis in the housing (201) and is fixedly connected to the rotor (204). Bearings (205) are installed between the motor shaft (202) and the magnetic shielding end cover (2012) and between the motor shaft (202) and the magnetic shielding partition (2014).

10. The integrated device of an axial magnetic coupler and a driver according to claim 2, characterized in that: The magnetic shielding sleeve (2011), the magnetic shielding end cover (2012) and the magnetic shielding partition (2014) are all made of ferromagnetic materials, and the magnetic leakage end cover (2013) is made of a non-magnetic and non-conductive hard insulating material.

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