CN216312979U - Magnetic suspension motor with hollow and split type rotor structure - Google Patents

Abstract

The invention discloses a magnetic suspension motor with a hollow and split rotor structure, which mainly comprises a hollow and split shaft-extension rotor, a radial and axial magnetic bearing, a protective bearing, a permanent magnet synchronous motor, a motor shell, a motor locking nut, an end cover and the like. The permanent magnet synchronous motor is positioned in the middle of the magnetic suspension motor, and a magnetic bearing component, a displacement sensor component, a protective bearing component, a locking nut sealing cover and the like are arranged outwards. The motor has the advantages of compact structure, small volume, light weight, high power density, high efficiency, high reliability and the like; the hollow rotor structure is adopted, the rotor is light in weight, the critical rotating speed of the rotor is improved, the falling damage degree is reduced, the safety margin of the rotor is improved, in addition, the hollow structure is beneficial to cooling the rotor, and the efficiency of the motor is improved; meanwhile, the split shaft extension structure adopted by the rotor widens the adaptability of the working condition of the motor, reduces the maintenance cost and is beneficial to mass production.

Description

Magnetic suspension motor with hollow and split type rotor structure

Technical Field

The invention belongs to the technical field of magnetic suspension motors, and particularly relates to a magnetic suspension motor with a hollow and split rotor structure, which can be used as a power device in the fields of centrifugal blast, compressors, molecular pumps, refrigeration compressors, generators, expanders and the like. In particular to a magnetic suspension motor with a hollow and split type shaft extension rotor structure.

Background

The magnetic suspension high-speed permanent magnet motor generally has the characteristic of higher relative power density, the corresponding loss density is higher, and when the cooling condition is not good enough, the temperature rise of the motor is also higher. If the temperature rise of the motor stator winding is too high, the insulation is unreliable, when the temperature rise of the rotor is too high, the permanent magnet can be demagnetized, and the control precision of the displacement sensor and the magnetic bearing can be influenced by the too high temperature rise. In order to ensure the safe and reliable operation of the magnetic suspension motor, a corresponding optimized cooling structure needs to be developed according to the characteristics of the magnetic suspension motor. The critical rotating speed of the magnetic suspension motor is limited, the mode of the rotor assembly is mainly used, when the magnetic suspension motor falls, the rotor assembly can collide with the protection bearing to cause large damage, and the rotor structure is optimized aiming at the condition. The application range of the magnetic suspension motor is wider and wider, different load interfaces exist in different application fields and even different application customers, and in order to facilitate the general design of a rotor structure, the application load interface part of the magnetic suspension motor can be replaced quickly and at low cost.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the cooling and ventilation structure in the rotor is provided, and the rotor assembly structure which can improve the critical rotating speed of the rotor and is convenient to realize low cost, quick maintenance and replacement of the load interface part is provided.

The technical scheme adopted by the invention for solving the problems is as follows: a magnetic suspension motor with a hollow and split rotor structure is composed of a motor rotor assembly, a protective bearing assembly, a displacement sensor assembly, a radial magnetic bearing assembly, an axial magnetic bearing assembly, a motor stator, a motor shell and the like. The rotating rotor component comprises a permanent magnet component, a permanent magnet sheath, a magnetic rotor component, a hollow structure rotor and a split type design shaft extension; stator coil is located in the middle of motor, axial magnetic bearing assembly, radial magnetic bearing assembly, displacement sensor assembly and protection bearing assembly are set on the left side, radial magnetic bearing assembly and protection bearing assembly are set on the right side. The left end protection bearing and the left side shaft extension A form a radial protection gap and an axial protection gap of 0.15-0.3mm, and the right end protection bearing and the right side shaft extension B form a radial protection gap of 0.15-0.3 mm. The radial and axial magnetic bearings are non-contact magnetic suspension bearings, the gaps of which are larger than the gaps of corresponding protective bearings, and the protective bearings can protect the rotor assembly and the magnetic bearing assembly when the rotor falls.

The rotor adopts a hollow structure, and the interior of the rotor is communicated with a cavity inside the motor through uniformly distributed inclined holes designed on a rotating shaft, so that cooling gas inside the motor can pass through an air gap between a stator and the rotor of the motor and can be cooled inside the rotor of the motor. The rotor hollow structure reduces the weight of the rotor, improves the critical rotating speed of the rotor, and reduces the damage to the protective bearing and the rotor assembly when the rotor falls.

Meanwhile, the shaft extension of the motor rotor adopts a split type structural design, when the magnetic suspension motor needs to adapt to different load interface requirements, the requirements can be met only by changing the shaft extension part, so that the motor rotating shaft can be designed universally, mass production is facilitated, and the cost can be reduced; meanwhile, due to the split type design of shaft extension, when the rotor falls off and a large abrasion condition occurs, the normal use of the motor can be met only by maintaining or replacing the shaft extension part, the whole rotor assembly is prevented from being replaced, and the maintenance cost of the motor is greatly reduced.

Compared with the prior structure, the invention has the advantages that: the magnetic suspension motor with the hollow and split rotor structure is adopted, so that the cooling of the interior of the motor rotor is enhanced, the weight of the rotor is reduced, the critical rotating speed of the rotor is improved, the damage degree caused by the falling of the rotor is reduced, and the production and maintenance costs of the magnetic suspension motor are reduced.

Drawings

FIG. 1 is a sectional view of a magnetic levitation motor with a hollow and split rotor structure according to the present invention;

FIG. 2 is a sectional view of the hollow shaft structure of the present invention;

FIG. 3 is a sectional view of the split rotor shaft extension structure of the present invention;

description of reference numerals:

1-a rotor assembly; 2-protecting the bearing assembly; 3-a displacement sensor assembly; a 4-radial magnetic bearing assembly; 5-an axial magnetic bearing assembly; 6-a motor stator; 7-motor housing; 8-a permanent magnet; 9-axial extension B; 10-axial extension A; 11-a motor air inlet; 12-motor air outlet;

101-a rotating shaft; 102-a rotating shaft air inlet A; 103-a rotating shaft air outlet; 104-inner cavity of rotating shaft; 105-a rotating shaft air inlet B; 106-locating pin; 107-fastening screws;

Detailed Description

The invention is described in detail below with reference to the drawings and the detailed description.

Referring to fig. 1, the invention relates to a magnetic suspension motor with a hollow and split shaft extension rotor structure, which comprises a motor rotor assembly 1, a protective bearing assembly 2, a displacement sensor assembly 3, a radial magnetic bearing assembly 4, an axial magnetic bearing assembly 5, a motor stator 6, a motor shell 7, a rotor permanent magnet 8, a shaft extension B9, a shaft extension a10 and the like. The left end protection bearing 2 and the left side shaft extension A10 form a radial protection gap and an axial protection gap of 0.15-0.3mm, and the right end protection bearing 2 and the right side shaft extension B9 form a radial protection gap of 0.15-0.3 mm. The radial magnetic bearing 4 and the axial magnetic bearing 5 are non-contact magnetic suspension bearings, the clearance between the radial magnetic bearing 4 and the axial magnetic bearing 5 and the motor rotor assembly 1 is larger than the corresponding clearance between the radial magnetic bearing and the axial magnetic bearing, and when the rotor assembly 1 falls, the rotor assembly and the magnetic bearing assemblies can be protected by the protective bearings.

The rotating shaft 101 is of a hollow structure, and the inner cavity 104 of the rotating shaft is communicated with the cavity inside the motor through uniformly distributed inclined holes designed on the rotating shaft 101, so that cooling gas inside the motor can pass through an air gap between the motor stator 6 and the rotating shaft 101, and can also pass through the air inlet 105 of the rotating shaft of the motor, the inner cavity 104 of the rotating shaft and the air outlet 103 of the rotating shaft to ventilate so as to cool a rotor of the motor. The rotating shaft 101 is internally provided with a hollow structure, so that the weight of the rotor assembly 1 is reduced, the bending moment resistance of the rotor assembly 1 is enhanced, the mode of the rotor assembly 1 is improved, and the critical rotating speed of the magnetic suspension motor is improved; in addition, since the weight of the rotor assembly 1 is reduced, damage to the protective bearing assembly 2 and the rotor assembly 1 can be reduced when the rotor assembly 1 falls down due to a motor failure.

The motor rotor shaft extension 10 adopts a split structure design, and the shaft extension 10 and the rotating shaft 101 are positioned through a pin 106 and a spigot and are fixed through a fastening screw 107. When the magnetic suspension motor needs to adapt to different load interface requirements, the requirements can be met only by changing the shaft extension structure, so that the motor rotating shaft 101 can be designed in a universal manner, mass production is facilitated, and the cost can be reduced; meanwhile, due to the split design of the shaft extensions 9 and 10, after the rotor assembly 1 falls down and when a large abrasion condition occurs, the normal use of the motor can be met only by maintaining or replacing the shaft extensions, the need of replacing the whole rotor assembly 1 is avoided, and the maintenance cost of the motor is greatly reduced.

The above description is only one example of the present invention, and the present invention is not limited thereto. It should be noted that the names and forms of the components described in the present invention may be different, and any modification, addition or improvement made according to the constitution, the feature and the principle of the present invention should be considered as the protection scope of the present invention.

Claims (4)

1. A magnetic suspension motor with a hollow and split rotor structure is composed of a motor rotor assembly, a protective bearing assembly, a displacement sensor assembly, a radial magnetic bearing assembly, an axial magnetic bearing assembly, a motor stator, a motor shell and the like, and is characterized in that a rotating rotor assembly comprises a permanent magnet component, a permanent magnet sheath, a magnetic rotor component, a rotating shaft and a shaft extension component; stator coil of stator part is located in the middle of the motor, there are axial magnetic bearing assembly, radial magnetic bearing assembly, displacement sensor assembly and protective bearing assembly sequentially on the left side, there are radial magnetic bearing assembly and protective bearing assembly, etc. on the right side, the motor rotor adopts the hollow structure, has lightened the rotor weight, has improved the ability of resisting bending moment of the rotor, has improved the critical speed of the rotor, the hollow structure of the rotor has realized the cooling wind path inside the rotor, has reduced the internal temperature of the motor, has raised the motor efficiency, the motor rotor shaft has adopted the design of the split type structure, when the magnetic levitation motor needs to meet different load interface requirements, only need to change the structure of shaft extension to meet the requirements, so the motor spindle can be made the design of the universality, benefit to the mass production, can lower costs; meanwhile, due to the split type design of shaft extension, when the rotor falls off and a large abrasion condition occurs, the normal use of the motor can be met only by maintaining or replacing the shaft extension part, the whole rotor assembly is prevented from being replaced, and the maintenance cost of the motor is greatly reduced.

2. The magnetic levitation motor with the hollow and split type rotor structure as claimed in claim 1, wherein: the left end protection bearing and the left side shaft extension A form a radial protection gap and an axial protection gap of 0.15-0.3mm, the right end protection bearing and the right side shaft extension B form a radial protection gap of 0.15-0.3mm, the radial and axial magnetic bearings are non-contact magnetic suspension bearings, and the gaps of the magnetic suspension bearings are larger than the gaps of the corresponding protection bearings.

3. The magnetic levitation motor with the hollow and split type rotor structure as claimed in claim 1, wherein: the rotor adopts hollow structure to inside equipartition inclined hole through the rotor design link up with the inside cavity of motor, and the inside cooling gas of motor except the air gap between accessible motor stator and the rotor passes through like this, still can be through the inside cooling of electric motor rotor, and rotor hollow structure has reduced rotor weight, has improved the critical rotational speed of rotor, has also reduced the destruction to protection bearing and rotor subassembly when the rotor falls.

4. The magnetic levitation motor with the hollow and split type rotor structure as claimed in claim 1, wherein: the split type design of the shaft extension of the rotating shaft and the shaft extensions at the two ends ensures that the shaft extension and the rotating shaft are coaxial, the positioning is accurate, and the installation is reliable.

Images