Magnetic suspension permanent magnet synchronous motor

Abstract

The utility model provides a magnetic suspension permanent magnet synchronous motor, which comprises a motor casing and a motor rotor, and is characterized in that an A-end protective bearing assembly, an A-end radial magnetic bearing assembly, a motor stator, an axial magnetic suspension bearing assembly, a B-end radial magnetic bearing assembly and a B-end protective bearing assembly are sequentially arranged in the motor casing; the motor rotor sequentially penetrates through the A-end protection bearing assembly, the A-end radial magnetic bearing assembly, the motor stator, the axial magnetic suspension bearing assembly, the B-end radial magnetic bearing assembly and the B-end protection bearing assembly, and an inner cavity cooling fan assembly and a thrust disc are sequentially arranged at the end, close to the B-end protection bearing assembly, of the motor rotor; according to the utility model, the thrust disc and the inner cavity cooling fan assembly are placed at one end of the motor rotor close to the B-end protection bearing assembly, so that the problem of balance of two ends of the rotating shaft after the A end of the motor is loaded can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic suspension motors, in particular to a magnetic suspension permanent magnet synchronous motor. Background Art

[0002] Motors are widely used in the industrial field. With the continuous development of technology, magnetic levitation motors are used more and more. Compared with traditional motors, magnetic levitation motors are suspended before rotating, have no mechanical friction and do not require lubrication, have the characteristics of high efficiency and no oil pollution. However, the rotor of the magnetic levitation motor is suspended during operation, which often leads to a large difference in the control force of the front and rear radial magnetic bearings, and radial instability under high-speed operation. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a magnetic suspension permanent magnet synchronous motor.

[0004] To achieve the above objectives, the utility model is implemented through the following technical solutions: a magnetic levitation permanent magnet synchronous motor, including a motor housing and a motor rotor, wherein an A-end protective bearing assembly, an A-end radial magnetic bearing assembly, a motor stator, an axial magnetic levitation bearing assembly, a B-end radial magnetic bearing assembly and a B-end protective bearing assembly are sequentially arranged in the motor housing, and the motor rotor passes through the A-end protective bearing assembly, the A-end radial magnetic bearing assembly, the motor stator, the axial magnetic levitation bearing assembly and the B-end radial magnetic bearing assembly, and the B-end protective bearing assembly in sequence, and an inner cavity cooling fan assembly and a thrust plate are sequentially arranged at one end of the motor rotor close to the B-end protective bearing assembly.

[0005] By adopting the above technical solution, the thrust plate and the inner cavity cooling fan assembly are placed at one end of the motor rotor close to the B-end protective bearing assembly, which can solve the balance problem of the two ends of the rotating shaft after the motor A end is loaded. In addition, the inner cavity cooling fan assembly is integrated into the rotating shaft to avoid vibration and external fault points caused by using an external air source for cooling, making the magnetic levitation permanent magnet synchronous motor run more smoothly and efficiently.

[0006] Optionally, the A-end protective bearing assembly includes a protective bearing 1, an A-end protective bearing pressure cover and an A-end protective bearing seat, and the protective bearing is installed inside the A-end protective bearing seat and is tightened by the A-end protective bearing pressure cover.

[0007] Optionally, the A-end radial magnetic bearing assembly includes an A-end radial magnetic bearing, an A-end radial magnetic bearing seat, a radial displacement sensor 1 and an axial displacement sensor; the A-end radial magnetic bearing, the radial displacement sensor 1 and the axial displacement sensor are installed inside the A-end radial magnetic bearing seat.

[0008] Optionally, the B-end protective bearing assembly includes a protective bearing 2, a B-end protective bearing pressure cover and a B-end protective bearing seat, and the protective bearing is installed inside the B-end protective bearing seat and is tightened by the B-end protective bearing pressure cover.

[0009] Optionally, the B-end radial magnetic bearing assembly includes a B-end radial magnetic bearing, a B-end radial magnetic bearing seat, a second radial displacement sensor and a Hall speed sensor; the B-end radial magnetic bearing, the second radial displacement sensor and the Hall speed sensor are installed inside the B-end radial magnetic bearing seat.

[0010] Optionally, the inner cavity cooling fan assembly includes a cooling impeller, a pull rod and a locking nut. The pull rod passes through the cooling impeller and is connected to the motor rotor. The cooling impeller is locked to the pull rod by the locking nut.

[0011] Optionally, heat dissipation components are arranged on both sides of the inner cavity heat dissipation fan component, and the heat dissipation components include a heat dissipation inlet adapter tube and a heat dissipation shell, and the heat dissipation inlet adapter tube is fixed on the outside of the heat dissipation shell.

[0012] Optionally, it also includes an air duct, one end of which is fixedly connected to the radial magnetic bearing seat at the A end, and the other end of which is fixedly connected to the radial magnetic bearing seat at the B end. The air duct is used to guide the cooling gas generated by the inner cavity cooling fan assembly to the interior of the A end magnetic bearing seat through the B end magnetic bearing seat.

[0013] Optionally, magnetic steel is provided on the surface of the motor rotor.

[0014] The utility model provides a magnetic suspension permanent magnet synchronous motor, which has the following beneficial effects:

[0015] 1. The utility model provides a magnetic levitation permanent magnet synchronous motor, in which a thrust plate and an inner cavity cooling fan assembly are placed at one end of the motor rotor close to the B-end protective bearing assembly. When the A-end of the magnetic levitation motor is connected to a load, the inner cavity cooling fan assembly and the thrust plate are used to balance the B-end, so that the magnetic levitation motor reaches a balanced state, which can solve the problem of balancing the two ends of the rotating shaft after the A-end of the motor is loaded. In addition, the inner cavity cooling fan assembly is integrated into the rotating shaft, which avoids vibration and external fault points caused by using an external air source for cooling, so that the magnetic levitation permanent magnet synchronous motor runs more smoothly and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic structural diagram of a magnetically suspended permanent magnet synchronous motor according to an embodiment of the present invention.

[0017] Figure 2 for Figure 1 Middle Section A - Enlarged schematic diagram of the A-end protection bearing assembly.

[0018] Figure 3 for Figure 1 An enlarged schematic diagram of the radial magnetic bearing assembly at the B-A end.

[0019] Figure 4 for Figure 1 Middle C section - enlarged schematic diagram of the B-end protection bearing assembly.

[0020] Figure 5 for Figure 1 Section D - Enlarged schematic diagram of the heat dissipation component.

[0021] Description of the accompanying drawings: 1. A-end protective bearing assembly; 101. Protective bearing 1; 102. A-end protective bearing gland; 103. A-end protective bearing seat; 2. A-end radial magnetic bearing assembly; 201. A-end radial magnetic bearing; 202. A-end radial magnetic bearing seat; 203. Radial displacement sensor 1; 204. Axial displacement sensor; 3. Motor leg; 4. Motor housing; 5. Motor stator; 6. Motor rotor; 7. Axial magnetic suspension bearing assembly; 8. Air duct; 9. B-end radial magnetic bearing assembly; 90 1. Radial magnetic bearing at end B; 902. Radial magnetic bearing seat at end B; 903. Radial displacement sensor 2; 904. Hall speed sensor; 10. Protective bearing assembly at end B; 1001. Protective bearing 2; 1002. Protective bearing gland at end B; 1003. Protective bearing seat at end B; 11. Heat dissipation assembly; 1101. Heat dissipation inlet adapter; 1102. Heat dissipation housing; 12. Inner cavity heat dissipation fan assembly; 1201. Impeller; 1202. Pull rod; 1203. Locking nut; 13. Thrust plate. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiment is one embodiment of the utility model, not all embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] like Figure 1As shown, an embodiment of the utility model provides a magnetic levitation permanent magnet synchronous motor, including a motor casing and a motor rotor 6, a motor housing 4 is arranged on the outside of the motor casing, a magnetic steel is attached to the surface of the motor rotor 6, a motor leg 3 is arranged at the lower part of the motor casing, and an A-end protective bearing component 1, an A-end radial magnetic bearing component 2, a motor stator 5, an axial magnetic levitation bearing component 7, a B-end radial magnetic bearing 901 component 9, and a B-end protective bearing component are arranged in the motor casing in sequence, and the motor rotor 6 passes through the A-end protective bearing component 1, the A-end radial magnetic bearing 201 component 2, the motor stator 5, the axial magnetic levitation bearing component 7, the B-end radial magnetic bearing 901 component 9, and the B-end protective bearing component in sequence, and an inner cavity cooling fan component 12 and a thrust plate 13 are arranged on one end of the motor rotor 6 close to the B-end protective bearing component in sequence, so that when the A end of the magnetic levitation motor is connected to a load, the inner cavity cooling fan component 12 and the thrust plate 13 are used to balance at the B end, so that the magnetic levitation motor reaches a balanced state.

[0024] The A-end protective bearing assembly 1 includes a protective bearing 101, an A-end protective bearing cover 102 and an A-end protective bearing seat 103. The protective bearing 101 is installed inside the A-end protective bearing seat and is pressed by the A-end protective bearing cover 102. Similarly, the B-end protective bearing assembly 10 includes a protective bearing 2 1001, a B-end protective bearing cover 1002 and a B-end protective bearing seat 1003. The protective bearing 2 1001 is installed inside the B-end protective bearing seat and is pressed by the B-end protective bearing cover. Specifically, the motor rotor 6 is arranged on the protective bearing 101 and the protective bearing 2 1001, and has no contact with the A-end radial magnetic bearing 201 and the B-end radial magnetic bearing 901.

[0025] The A-end radial magnetic bearing 201 component 2 includes an A-end radial magnetic bearing 201, an A-end radial magnetic bearing seat 202, a radial displacement sensor 203 and an axial displacement sensor 204; the A-end radial magnetic bearing 201, the radial displacement sensor 203 and the axial displacement sensor 204 are installed inside the A-end radial magnetic bearing seat 202 to detect the radial and axial displacements of the motor rotor 6, and the radial displacement sensor 203 is used for magnetic bearing control and protection; similarly, the B-end radial magnetic bearing component 9 includes a B-end radial magnetic bearing 901, a B-end radial magnetic bearing seat 902, a radial displacement sensor 2 903 and a Hall speed sensor 904; the B-end radial magnetic bearing 901, the radial displacement sensor 2 903 and the Hall speed sensor 904 are installed inside the B-end radial magnetic bearing seat 902, and the Hall speed sensor 904 is used to measure the speed of the magnetic levitation motor.

[0026] The inner cavity cooling fan assembly 12 includes a cooling impeller 1201, a pull rod 1202 and a locking nut 1203. The pull rod 1202 passes through the cooling impeller 1201 and is connected to the motor rotor 6. The cooling impeller 1201 is locked with the pull rod 1202 by the locking nut 1203. Cooling assemblies 11 are arranged on both sides of the inner cavity cooling fan assembly 12. The cooling assembly 11 includes a cooling inlet adapter tube 1101 and a cooling shell 1102. The cooling inlet adapter tube 1101 is fixed on the outside of the cooling shell 1102.

[0027] It also includes an air duct 8, one end of which is fixedly connected to the radial magnetic bearing seat 202 at the A end, and the other end of the air duct 8 is fixedly connected to the radial magnetic bearing seat 902 at the B end. The air duct 8 is used to guide the cooling gas generated by the inner cavity cooling fan assembly 12 to the inside of the radial magnetic bearing seat 202 at the A end through the radial magnetic bearing seat 902 at the B end.

[0028] The implementation principle of the embodiment of the utility model is: the thrust plate 13 and the inner cavity cooling fan assembly 12 are placed at one end of the motor rotor 6 close to the B-end protective bearing assembly. In this way, when the A end of the magnetic levitation motor is connected to a load, the inner cavity cooling fan assembly 12 and the thrust plate 13 are used to balance at the B end, so that the magnetic levitation motor reaches a balanced state. In addition, the inner cavity cooling fan assembly 12 is integrated into the rotating shaft to avoid vibration and external fault points caused by using an external air source for cooling, so that the magnetic levitation permanent magnet synchronous motor runs more smoothly and efficiently.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnetically suspended permanent magnet synchronous motor, characterized in that: The invention comprises a motor housing and a motor rotor (6), wherein an A-end protective bearing assembly (1), an A-end radial magnetic bearing assembly (2), a motor stator (5), an axial magnetic suspension bearing assembly (7), a B-end radial magnetic bearing assembly (9) and a B-end protective bearing assembly are sequentially arranged in the motor housing; the motor rotor (6) sequentially passes through the A-end protective bearing assembly (1), the A-end radial magnetic bearing assembly (2), the motor stator (5), the axial magnetic suspension bearing assembly (7), the B-end radial magnetic bearing assembly (9) and the B-end protective bearing assembly (10); and an inner cavity cooling fan assembly (12) and a thrust plate (13) are sequentially arranged at one end of the motor rotor (6) close to the B-end protective bearing assembly (10).

2. A magnetic levitation permanent magnet synchronous motor according to claim 1, characterized in that: The A-end protective bearing assembly (1) comprises a protective bearing 1 (101), an A-end protective bearing pressure cover (102) and an A-end protective bearing seat (103); the protective bearing (101) is installed inside the A-end protective bearing seat (103) and is pressed by the A-end protective bearing pressure cover (102).

3. A magnetic levitation permanent magnet synchronous motor according to claim 2, characterized in that: The A-end radial magnetic bearing assembly (2) comprises an A-end radial magnetic bearing (201), an A-end radial magnetic bearing seat (202), a radial displacement sensor 1 (203) and an axial displacement sensor (204); the A-end radial magnetic bearing (201), the radial displacement sensor 1 (203) and the axial displacement sensor (204) are installed inside the A-end radial magnetic bearing seat (202).

4. The magnetic levitation permanent magnet synchronous motor according to claim 3, characterized in that: The B-end protective bearing assembly (10) comprises a second protective bearing (1001), a B-end protective bearing pressure cover (1002) and a B-end protective bearing seat (1003); the second protective bearing (1001) is installed inside the B-end protective bearing seat (1003) and is pressed by the B-end protective bearing pressure cover (1002).

5. The magnetic levitation permanent magnet synchronous motor according to claim 4, characterized in that: The B-end radial magnetic bearing assembly (9) comprises a B-end radial magnetic bearing (901), a B-end radial magnetic bearing seat (902), a second radial displacement sensor (903) and a Hall speed sensor (904); the B-end radial magnetic bearing (901), the second radial displacement sensor (903) and the Hall speed sensor (904) are installed inside the B-end radial magnetic bearing seat (902).

6. The magnetic levitation permanent magnet synchronous motor according to claim 5, characterized in that: The inner cavity cooling fan assembly (12) comprises a cooling impeller (1201), a pull rod (1202) and a locking nut (1203); the pull rod (1202) passes through the cooling impeller (1201) and is connected to the motor rotor (6); the cooling impeller (1201) is locked with the pull rod (1202) by the locking nut (1203).

7. The magnetic levitation permanent magnet synchronous motor according to claim 6, characterized in that: Heat dissipation components (11) are arranged on both sides of the inner cavity heat dissipation fan component (12), and the heat dissipation component (11) comprises a heat dissipation inlet adapter tube (1101) and a heat dissipation shell (1102), and the heat dissipation inlet adapter tube (1101) is fixed on the outside of the heat dissipation shell (1102).

8. The magnetic levitation permanent magnet synchronous motor according to claim 7, characterized in that: It also includes an air duct (8), one end of which is fixedly connected to the radial magnetic bearing seat (202) at the A end, and the other end of which is fixedly connected to the radial magnetic bearing seat (902) at the B end. The air duct (8) is used to guide the cooling gas generated by the inner cavity heat dissipation fan assembly (12) to the inside of the magnetic bearing seat at the A end through the magnetic bearing seat at the B end.

9. The magnetic levitation permanent magnet synchronous motor according to claim 1, characterized in that: Magnetic steel is arranged on the surface of the motor rotor.

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