Axial magnetic flux electromagnetic coupling

Abstract

The utility model relates to an axial magnetic flux electromagnetic coupling, which comprises a driving shaft, a driving shaft rotor, permanent magnets, an iron core, a pole coil and a driven shaft, the driving shaft rotor is fixed on the driving shaft, a plurality of permanent magnets which are alternately arranged along the circumferential direction are embedded in the driving shaft rotor, and the polarities of the adjacent permanent magnets are opposite; the iron cores are fixed on the driven shaft through a fixing frame, pole coils are wound on the iron cores, and the winding directions of the pole coils of the adjacent iron cores are opposite; and the magnetic field direction of the permanent magnet is parallel to the magnetic field direction of the magnetized iron core, so that axial magnetic flux coupling is formed. Compared with a traditional rigid and elastic coupling and a traditional permanent magnet coupling, the axial magnetic flux electromagnetic coupling is adjustable in torque, self-centering in operation and capable of achieving high-quality transmission of electromagnetic torque.

Description

Technical Field

[0001] This utility model relates to a non-contact transmission device, and more particularly to an axial flux electromagnetic coupling that achieves torque adjustment through coupling of a permanent magnet and an electromagnetic coil. Background Technology

[0002] Rotating machinery typically uses couplings to connect the driving shaft and driven shaft, transmitting the motion and torque of the driving shaft. Traditional couplings are generally rigid or flexible, both being contact-type transmissions. Magnetic couplings, on the other hand, are contactless transmission devices that transmit torque based on magnetic field coupling. They generally utilize permanent magnets to establish a magnetic field between the driving and driven shafts, thus achieving torque transmission.

[0003] In existing technologies, the magnetic field between the driving and driven shafts of a magnetic coupling is established by permanent magnets, and the magnetic field strength cannot be changed and the electromagnetic torque cannot be adjusted. Magnetic couplings use a large number of permanent magnets, resulting in high costs. The interaction force between the permanent magnets between the driving and driven shafts is large, making alignment difficult. Magnetic couplings also have a large starting torque.

[0004] Existing technologies such as CN103765742A adjust the magnetic flux by adding a coil to the permanent magnet, but its structure is complex and the magnetic field distribution is not optimized; although the electromagnetic actuator of CN110821958A involves axial control, it does not solve the problem of coupling torque adjustment. Therefore, there is an urgent need for a coupling with a simple structure, adjustable torque, and self-aligning. Summary of the Invention

[0005] To address the problems existing in the prior art, this utility model proposes an axial flux electromagnetic coupling with adjustable torque. Through a reasonable combination of the drive shaft rotor, permanent magnet, iron core, magnetic pole coil, fixing frame, connecting wire, etc., high-quality transmission of electromagnetic torque and adjustable electromagnetic torque are achieved.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: an axial flux electromagnetic coupling, comprising a drive shaft, a drive shaft rotor, permanent magnets, an iron core, magnetic pole coils, and a driven shaft. The drive shaft rotor is fixed on the drive shaft, and multiple permanent magnets arranged alternately along the circumference are embedded inside the drive shaft rotor, with adjacent permanent magnets having opposite polarities. The iron core is fixed on the driven shaft by a fixing frame, and magnetic pole coils are wound on the iron core, with adjacent iron cores having opposite winding directions. The magnetic field direction of the permanent magnets is parallel to the magnetic field direction of the magnetized iron core, forming axial flux coupling.

[0007] Furthermore, the permanent magnet is fixed inside the drive shaft rotor by the rotor yoke.

[0008] Furthermore, a protective ring is provided on the outside of the permanent magnet, and the protective ring is fitted outside the magnetic pole coil.

[0009] Furthermore, a baffle is provided between the iron core and the fixed frame. The baffle is fixed on the iron core, the fixed frame is fixed on the driven shaft, and the iron core is fixed on the fixed frame.

[0010] Furthermore, the driving shaft and the driven shaft are arranged coaxially.

[0011] Furthermore, the magnetic pole coil is connected to an external DC power supply via a connecting wire to adjust the magnetic field strength;

[0012] Furthermore, the external DC power supply is provided by brushes, a brushless excitation system, or a wireless power transmission device.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention relates to an axial flux electromagnetic coupling, applied to contactless transmission. An external DC power supply provides excitation energy to the magnetic pole coils of the coupling, establishing a magnetic field. This magnetic field couples with the magnetic field established by the permanent magnet of the driving shaft, enabling the transmission of electromagnetic torque from the driving shaft to the driven shaft. Compared to traditional rigid, flexible, and permanent magnet couplings, this axial flux electromagnetic coupling offers adjustable torque, self-aligning operation, and high-quality electromagnetic torque transmission. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the axial electromagnetic coupling structure of this utility model;

[0016] In the diagram: 1 is the drive shaft, 2 is the drive shaft rotor, 3 is the rotor yoke, 4 is the permanent magnet, 5 is the baffle, 6 is the retaining ring, 7 is the fixed frame, 8 is the iron core, 9 is the magnetic pole coil, 10 is the connecting wire, and 11 is the driven shaft. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0018] like Figure 1 As shown, this utility model discloses an axial flux electromagnetic coupling, which includes a drive shaft 1, a drive shaft rotor 2, a rotor yoke 3, a permanent magnet 4, a baffle 5, a retaining ring 6, a fixing frame 7, an iron core 8, a magnetic pole coil 9, a connecting wire, and a driven shaft 11.

[0019] The drive shaft rotor 2 is fixed on the drive shaft 1. Multiple permanent magnets 4 are embedded inside the drive shaft rotor 2, arranged alternately along the circumference. The polarities of adjacent permanent magnets 4 are opposite. The iron core 8 is fixed on the driven shaft 11 by the fixing frame 7. Magnetic pole coils 9 are wound on the iron core 8. The magnetic pole coils 9 of adjacent iron cores 8 are wound in opposite directions. The magnetic field direction of the permanent magnets 4 is parallel to the magnetic field direction of the iron core 8 after it is magnetized, forming axial magnetic flux coupling.

[0020] Preferably, the permanent magnet 4 is fixed inside the drive shaft rotor 2 by the rotor yoke 3.

[0021] Preferably, a retaining ring 6 is provided on the outside of the permanent magnet 4, and the retaining ring 6 is fitted outside the magnetic pole coil 9.

[0022] Preferably, a baffle 5 is provided between the iron core 8 and the fixing frame 7, and the baffle 5 is used to limit the axial displacement of the magnetic pole coil 9.

[0023] Preferably, the baffle 5 is fixed on the iron core 8 to prevent the magnetic pole coil 9 from moving axially; the fixing frame 7 is fixed on the driven shaft 11, and the iron core 8 is fixed on the fixing frame 7.

[0024] Preferably, the driving shaft 1 and the driven shaft 11 are concentric.

[0025] Preferably, the magnetic pole coil 9 is connected to an external DC power supply via a connecting line 10 to adjust the magnetic field strength.

[0026] Preferably, the magnetic field direction of the electromagnetic coupling is axial.

[0027] Preferably, an external DC power supply is provided to the magnetic pole coil 9 via the connecting line 10. The external DC power supply can be provided by brushes, a brushless excitation system, or a wireless power transmission device.

[0028] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any improvements made by those skilled in the art within the scope of the technical solution disclosed in this utility model, without changing the principle, should also be considered within the scope of protection of this utility model.

Claims

1. An axial flux electromagnetic coupling, characterized in that: It includes a drive shaft, a drive shaft rotor, permanent magnets, an iron core, magnetic pole coils, and a driven shaft. The drive shaft rotor is fixed on the drive shaft. The drive shaft rotor has multiple permanent magnets arranged alternately along the circumference embedded inside, with adjacent permanent magnets having opposite polarities. The iron core is fixed on the driven shaft by a fixing frame. Magnetic pole coils are wound on the iron core, with adjacent iron cores having opposite winding directions. The magnetic field direction of the permanent magnets is parallel to the magnetic field direction of the magnetized iron core, forming axial magnetic flux coupling.

2. The axial flux electromagnetic coupling according to claim 1, characterized in that: The permanent magnet is fixed inside the drive shaft rotor by the rotor yoke.

3. The axial flux electromagnetic coupling according to claim 1, characterized in that: The permanent magnet has a protective ring on its outer side, which is fitted around the outside of the magnetic pole coil.

4. The axial flux electromagnetic coupling according to claim 1, characterized in that: A baffle is provided between the iron core and the fixed frame. The baffle is fixed on the iron core, the fixed frame is fixed on the driven shaft, and the iron core is fixed on the fixed frame.

5. The axial flux electromagnetic coupling according to claim 1, characterized in that: The driving shaft and the driven shaft are arranged coaxially.

6. The axial flux electromagnetic coupling according to claim 1, characterized in that: The magnetic pole coil is connected to an external DC power supply via a connecting wire to adjust the magnetic field strength.

7. The axial flux electromagnetic coupling according to claim 6, characterized in that: External DC power is provided by brushes, a brushless excitation system, or a wireless power transmission device.

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