CN215682041U

CN215682041U - Magnetic suspension energy storage motor using flywheel as thrust disc

Info

Publication number: CN215682041U
Application number: CN202121616777.2U
Authority: CN
Inventors: 钟仁志; 袁军
Original assignee: Xinlei Compressor Co Ltd
Current assignee: Xinlei Compressor Co Ltd
Priority date: 2021-07-16
Filing date: 2021-07-16
Publication date: 2022-01-28
Anticipated expiration: 2031-07-16

Abstract

The utility model relates to the field of magnetic suspension energy storage motors, in particular to a magnetic suspension energy storage motor taking a flywheel as a thrust disc. The motor comprises a motor barrel, a motor stator, a radial magnetic bearing, an axial magnetic bearing and a motor shaft; the motor stator is fixedly embedded in the motor barrel and sleeved on the motor shaft, and the plurality of radial magnetic bearings are sleeved at two ends of the motor shaft; the motor shaft is provided with a motor rotor, a plurality of bearing rotors and a flywheel, and the motor rotor and the plurality of bearing rotors are respectively aligned with the motor stator and the radial magnetic bearing; the flywheel is provided with axial rotors on two axial end faces, and the plurality of axial magnetic bearings are respectively positioned on two axial sides of the flywheel and are respectively aligned with the axial rotors on the two end faces of the flywheel. The motor concentrates the energy storage and the axial limiting of the motor on the flywheel, and a thrust disc is not required to be arranged, so that the number of devices in the motor is reduced, and the internal space of the motor is optimized.

Description

Magnetic suspension energy storage motor using flywheel as thrust disc

Technical Field

The utility model relates to the field of magnetic suspension energy storage motors, in particular to a magnetic suspension energy storage motor taking a flywheel as a thrust disc.

Background

Modern flywheel energy storage systems have been successfully applied to the fields of uninterruptible power supplies, peak shaving of renewable energy photovoltaic power generation and wind power generation, hybrid electric vehicles and the like. The technology of adopting an electromagnetic bearing to support the energy storage flywheel rotor in a magnetic suspension manner becomes a main technical means for solving the problem of safe operation of the high-speed flywheel rotor. The flywheel energy storage system mainly comprises an energy storage flywheel, a motor/generator, an electromagnetic bearing, an energy conversion system, a vacuum system and the like, wherein an energy storage flywheel rotor is a high-speed rotating part, and the working condition of the energy storage flywheel rotor can directly influence the performance and reliability of the whole system.

The Chinese invention patent application (publication No. CN107240981B, published: 20200407) discloses a detachable magnetic suspension energy storage flywheel rotor, wherein a flywheel rotor shaft is a stepped shaft, an axial electromagnetic bearing thrust disc is provided with uniformly distributed threaded holes, and the connection with the flywheel rotor shaft adopts a threaded axial compression mode; the auxiliary bearing rotor is provided with threaded holes which are uniformly distributed and are in interference fit with a flywheel rotor shaft; the electromagnetic bearing expansion sleeve and the energy storage flywheel are assembled on the flywheel rotor shaft in an expansion sleeve connection mode; the motor/generator rotor and flywheel rotor shaft are typically assembled by interference fit, using a thermal assembly method. The device is convenient to disassemble, saves the maintenance cost and shortens the manufacturing period; the processing and manufacturing are convenient, and the processing and manufacturing precision is easy to ensure; the assembling is convenient, the working performance of the flywheel rotor is easy to guarantee, and the problem of assembling and disassembling of the electromagnetic bearing rotor with large interference fit is solved.

The prior art has the following defects: the motor shaft is simultaneously provided with two devices, namely a thrust disc and a flywheel, the axial magnetic bearings are arranged on two sides of the thrust disc to axially limit the motor shaft, and the flywheel is used for storing energy; in the mode, the limitation to the motor shaft and the energy storage of the motor are respectively completed by the thrust disc and the flywheel, so that the number of devices in the motor and the complexity of the internal structure of the motor are increased, and the optimization of the internal space of the motor is not facilitated.

Disclosure of Invention

The purpose of the utility model is: aiming at the problems, axial rotors are arranged on two axial end faces of the flywheel, and axial magnetic bearings are arranged on two sides of the flywheel to axially limit the flywheel; therefore, the energy storage and axial limiting of the motor are concentrated on the flywheel, a thrust disc is not needed, the number of devices in the motor is reduced, and the internal space of the motor is optimized.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a magnetic suspension energy storage motor taking a flywheel as a thrust disc comprises a motor barrel, a motor stator, a radial magnetic bearing, an axial magnetic bearing and a motor shaft; the motor stator is fixedly embedded in the motor barrel and sleeved on the motor shaft, and the plurality of radial magnetic bearings are sleeved at two ends of the motor shaft; the motor shaft is provided with a motor rotor, a plurality of bearing rotors and a flywheel, and the motor rotor and the plurality of bearing rotors are respectively aligned with the motor stator and the radial magnetic bearing; the flywheel is provided with axial rotors on two axial end faces, and the plurality of axial magnetic bearings are respectively positioned on two axial sides of the flywheel and are respectively aligned with the axial rotors on the two end faces of the flywheel.

Preferably, the magnetic suspension energy storage motor is further provided with a radial sensor and a radial and axial sensor, the radial sensor is used for detecting the radial displacement of one end of the motor shaft, and the radial and axial sensor is used for simultaneously detecting the radial displacement of the other end of the motor shaft and the axial displacement of the motor shaft.

Preferably, a first end cover and a second end cover are fixedly arranged at two ends of the motor cylinder respectively, and both the first end cover and the second end cover are provided with bearing inner holes; and protective bearings are further sleeved at two ends of the motor shaft, outer rings of the protective bearings are in interference fit with inner holes of the first end cover and the second end cover respectively, and gaps exist between inner rings of the protective bearings and the outer wall of the motor shaft.

Preferably, the motor cylinder is provided with a motor water cooling channel, and the motor water cooling channel is respectively used for connecting the water inlet device and the water discharging device.

Preferably, the motor water cooling channel is in a circular spiral shape.

Preferably, the motor cartridge, the first end cap and the second end cap are all made of 17-4PH stainless steel.

Preferably, the structure of the motor cylinder, the first end cover and the second end cover adopts an explosion-proof structure.

The magnetic suspension energy storage motor adopting the technical scheme has the advantages that:

the energy storage motor adopts a magnetic suspension bearing and has the characteristics of no oil, no maintenance, low power consumption, high rotating speed and long service life. Meanwhile, the flywheel is provided with axial rotors on two axial end faces, the plurality of axial magnetic bearings axially limit the motor shaft by limiting the axial rotors on the two end faces of the flywheel, and the flywheel also has an energy storage function; the energy storage of the motor and the axial limiting of the motor shaft can be simultaneously finished by only one flywheel device, so that the number of devices in the motor is reduced, and the internal space of the motor is optimized.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic diagram of an axial magnetic bearing and magnetic field circuit.

An L-field loop.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings.

Example 1

As shown in fig. 1 and fig. 2, the magnetic levitation energy storage motor using a flywheel as a thrust disc comprises a motor barrel 1, a motor stator 2, a radial magnetic bearing 3, an axial magnetic bearing 4 and a motor shaft 5; the motor stator 2 is fixedly embedded in the motor barrel 1 and sleeved on the motor shaft 5, and the plurality of radial magnetic bearings 3 are sleeved at two ends of the motor shaft 5; the motor shaft 4 is provided with a motor rotor 41, a plurality of bearing rotors 42 and a flywheel 43, the motor rotor 41 and the plurality of bearing rotors 42 are respectively aligned with the motor stator 2 and the radial magnetic bearing 3; the flywheel 43 is provided with axial rotors 44 on both axial end surfaces, and the plurality of axial magnetic bearings 4 are respectively located on both axial sides of the flywheel 43 and are respectively aligned with the axial rotors 44 on both end surfaces of the flywheel 43. In the mode, the energy storage motor adopts a magnetic suspension bearing, and has the characteristics of no oil, no maintenance, low power consumption, high rotating speed and long service life. Meanwhile, the flywheel 43 is provided with axial rotors 44 on two axial end faces, the plurality of axial magnetic bearings 4 axially limit the motor shaft 5 by limiting the axial rotors 44 on the two end faces of the flywheel 43, and the flywheel 43 also has an energy storage function; that is, only one flywheel 43 is needed to simultaneously complete the energy storage of the motor and the axial limit of the motor shaft 5, thereby reducing the number of devices in the motor and optimizing the internal space of the motor.

The magnetic suspension energy storage motor is further provided with a radial sensor 6 and a radial and axial sensor 7, the radial sensor 6 is used for detecting the radial displacement of one end of the motor shaft 5, and the radial and axial sensor 7 is used for simultaneously detecting the radial displacement of the other end of the motor shaft 5 and the axial displacement of the motor shaft 5.

A first end cover 11 and a second end cover 12 are respectively fixedly arranged at two ends of the motor barrel 1, and the first end cover 11 and the second end cover 12 are both provided with bearing inner holes; the two ends of the motor shaft 5 are also sleeved with protective bearings 51, the outer rings of the protective bearings 51 are in interference fit with the inner holes of the first end cover 11 and the second end cover 12 respectively, and gaps exist between the inner rings of the protective bearings 51 and the outer wall of the motor shaft 5. When the motor is suddenly powered off or stopped, the radial magnetic bearing 3 and the axial magnetic bearing 4 lose magnetic force and can not support and limit the motor shaft 5, and at the moment, the motor shaft 5 falls down and contacts with the inner ring of the protective bearing 51 to be supported by the protective bearing 51; thereby avoiding the damage of important parts such as the radial magnetic bearing 3 and the axial magnetic bearing 4 caused by the sudden drop of the motor shaft 5 when the motor is suddenly powered off or stopped.

The motor barrel 1 is provided with a motor water cooling channel 13, and the motor water cooling channel 13 is respectively used for connecting a water inlet device and a water drainage device so as to cool the motor. The motor water cooling passage 13 is in a circular spiral shape to increase a cooling area.

The motor cartridge 1, first end cap 11 and second end cap 12 are all made of 17-4PH stainless steel. The stainless steel with the pH value of 17-4 is a high-strength material and has an antirust function. The motor barrel 1, the first end cap 11 and the second end cap 12 are constructed in an explosion-proof structure, so that the surrounding safety can be protected in case of dangerous conditions.

Claims

1. A magnetic suspension energy storage motor taking a flywheel as a thrust disc is characterized by comprising a motor cylinder (1), a motor stator (2), a radial magnetic bearing (3), an axial magnetic bearing (4) and a motor shaft (5); the motor stator (2) is fixedly embedded in the motor barrel (1) and sleeved on the motor shaft (5), and the plurality of radial magnetic bearings (3) are sleeved at two ends of the motor shaft (5); the motor shaft (5) is provided with a motor rotor (41), a plurality of bearing rotors (42) and a flywheel (43), and the motor rotor (41) and the plurality of bearing rotors (42) are respectively aligned with the motor stator (2) and the radial magnetic bearing (3); the flywheel (43) is provided with axial rotors (44) on two axial end faces, and the plurality of axial magnetic bearings (4) are respectively positioned on two axial sides of the flywheel (43) and are respectively aligned with the axial rotors (44) on the two end faces of the flywheel (43).

2. A magnetic levitation energy storage motor with a flywheel as a thrust disc as claimed in claim 1, characterized in that the magnetic levitation energy storage motor is further provided with a radial sensor (6) and a radial and axial sensor (7), the radial sensor (6) is used for detecting the radial displacement of one end of the motor shaft (5), and the radial and axial sensor (7) is used for simultaneously detecting the radial displacement of the other end of the motor shaft (5) and the axial displacement of the motor shaft (5).

3. The magnetic suspension energy storage motor taking the flywheel as the thrust disc is characterized in that a first end cover (11) and a second end cover (12) are fixedly arranged at two ends of the motor cylinder (1) respectively, and the first end cover (11) and the second end cover (12) are both provided with bearing inner holes; both ends of the motor shaft (5) are further sleeved with protective bearings (51), outer rings of the protective bearings (51) are in interference fit with inner holes of the first end cover (11) and the second end cover (12) respectively, and gaps exist between inner rings of the protective bearings (51) and the outer wall of the motor shaft (5).

4. The magnetic suspension energy storage motor taking the flywheel as the thrust disc as claimed in claim 1 is characterized in that the motor barrel (1) is provided with a motor water cooling channel (13), and the motor water cooling channel (13) is respectively used for connecting a water inlet device and a water drainage device.

5. A magnetic suspension energy storage motor with a flywheel as a thrust disc according to claim 4, characterized in that the motor water cooling channel (13) is in a circular spiral shape.

6. A magnetic suspension energy storage motor with a flywheel as a thrust disc according to claim 3, characterized in that the motor cylinder (1), the first end cover (11) and the second end cover (12) are all made of 17-4PH stainless steel.

7. A magnetic suspension energy storage motor taking a flywheel as a thrust disc as claimed in claim 3, characterized in that the structure of the motor cylinder (1), the first end cover (11) and the second end cover (12) adopts an explosion-proof structure.