CN112615567A - Magnetic suspension motor and turbine motor system with high critical rotating speed - Google Patents
Magnetic suspension motor and turbine motor system with high critical rotating speed Download PDFInfo
- Publication number
- CN112615567A CN112615567A CN202011578660.XA CN202011578660A CN112615567A CN 112615567 A CN112615567 A CN 112615567A CN 202011578660 A CN202011578660 A CN 202011578660A CN 112615567 A CN112615567 A CN 112615567A
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- Prior art keywords
- rotor
- motor
- magnetic suspension
- magnetic
- high critical
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/02—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type
- H02K49/04—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type
- H02K49/046—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type with an axial airgap
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
- H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
- H02K49/108—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with an axial air gap
Abstract
The invention discloses a magnetic suspension motor with high critical rotating speed, which comprises: a magnetic suspension rotor and a magnetic suspension stator; the magnetic suspension rotor is provided with a torque transmission device at the shaft end to realize the torque transmission of the rotor shafts of a plurality of motors on the same axis or the torque transmission of adjacent rotor shaft segments in the same motor on the same axis; the contactless connection transmits only torque and not bending moments. The rotor with longer length is divided into a plurality of rotors with shorter length, and the rotors with shorter length are connected. Because the critical rotating speed of each of the rotors with shorter lengths is higher, the integral rotating speed of the connected motor is also improved.
Description
Technical Field
The invention relates to the field of magnetic suspension motors, in particular to a magnetic suspension motor with high critical rotating speed.
Background
The magnetic suspension motor is greatly popularized in the fields of industry, medical treatment and the like due to the characteristics of high speed, energy conservation, cleanness and the like. The advantage of a magnetic levitation motor is that the rotor rotates without mechanical contact with the bearing, so that the rotational speed of the rotor is theoretically dependent on the strength of the material itself. However, in the current industrial practical application, when the rotor speed of the magnetic suspension motor exceeds the critical speed, the motor can not work stably. In order to make the operating speed of the rotor as high as possible, it is therefore necessary to design the rotor length of the magnetic levitation motor as short as possible. This results in the rotor length of existing magnetic levitation motors being very limited. In industrial applications, there are many occasions where the rotor of an electric machine is required to have a high rotation speed and a long length. However, as the rotor of a magnetic levitation motor is longer, the lower the critical speed of the magnetic levitation motor, the lower the allowable operating speed. Therefore, the magnetic suspension motor can not be applied to the occasions, which greatly limits the application field and the scene of the magnetic suspension motor.
The existing magnetic suspension motor still has no practical case for stably realizing in the field. The existing design is aimed at solving the problem of stable operation of the magnetic suspension motor in a flexible state by aiming at solving the problem of high-speed operation of a longer rotor of the magnetic suspension motor. Because the rotor of the magnetic suspension motor is changed from the rigid rotor to the flexible rotor when the rotor of the magnetic suspension motor reaches or exceeds a first-order critical rotating speed, the working problem of the flexible rotor of the magnetic suspension motor is solved, and the high-speed working problem of the longer rotor of the magnetic suspension motor can be solved to a certain extent.
Specifically, the research at home and abroad aiming at the flexible rotor mainly has two aspects, one is synchronous vibration suppression, and the other is to design a control scheme by applying a modern control theory or a robust control theory so as to improve the support damping. Both of these protocols are still in the experimental phase. The synchronous vibration suppression technology is difficult to solve the problem of unbalanced vibration of an actual flexible rotor system. This is because the rotor will generate bending deformation in the subcritical and supercritical state, and the vibration caused by unbalanced mass is related to the bending deformation state of the rotor, and is far more complicated than that of the rigid rotor system, so the current synchronous vibration suppression technology is mainly directed to the rigid rotor system. However, the design and control scheme of modern control theory or robust control theory is still in the laboratory stage at present, and it is difficult to greatly improve the working stability of the system in subcritical and supercritical states at present.
Disclosure of Invention
The technical scheme of the invention is as follows: a magnetic suspension motor and a turbine motor system with high critical rotating speed achieve the purpose of high-speed work of a long and thin rotor of the magnetic suspension motor.
The critical rotating speed is low due to the fact that the length of the magnetic suspension motor rotor is too long, and the rotating speed of the rotor is further limited. Thus, the rotor with longer length is divided into a plurality of rotors with shorter length, and the rotors with shorter length are connected. Because the critical rotating speeds of the rotors with the shorter lengths are higher, the integral rotating speed of the connected motor is also improved, and the integral critical rotating speed of the motor depends on the rotor with the lowest critical rotating speed.
Specifically, a magnetic suspension motor with high critical rotating speed comprises: a magnetic suspension rotor and a magnetic suspension stator; the magnetically levitated rotor is provided with torque transfer means at the shaft ends to enable torque transfer between rotor shafts of multiple motors or between adjacent rotor shaft segments in the same motor.
The torque transfer device transfers torque in a coaxial relationship with the rotor axis, and generally, the torque transfer device includes a non-contact type connecting device, which mainly transfers torque, and in practical cases, some bending moment can be transferred.
Non-contact connection means include, but are not limited to: permanent magnet coupler, flexible shaft coupling, permanent magnetism eddy current driver. The permanent magnet coupler can be a radial coupling torque type permanent magnet coupler or an axial coupling torque type permanent magnet coupler.
If the contact type connection mode is used, the bending moment is transmitted among a plurality of shorter rotors through powerful conduction, at the moment, the whole of the plurality of shorter rotors forms a long rotor, the critical rotating speed of the long rotor is not increased, and therefore the contact type connection mode is not suitable for the invention. Compared with a contact connection mode, the non-contact connection mode can only transmit torque but not bending moment, so that the whole critical rotating speed after connection depends on the motor with the longest rotor length in the plurality of motors with smaller rotor lengths. Of course, the non-contact connection may also generate partial torque transmission (the actual process is not absolute), and the torque transmission is not the original design of the scheme and cannot be avoided in the actual process. For example, the conditions include, but are not limited to, situations caused by special working scenes or abnormal working states (such as tremor) during the operation of the motor.
Specifically, one arrangement of the present invention is: the magnetic suspension motors with short shaft lengths are connected and arranged, and adjacent magnetic suspension motors are axially butted through a torque transmission device (mainly a non-contact connecting device) at the end part of each magnetic suspension rotor shaft. When a plurality of magnetic suspension motors with short shaft lengths are in butt joint operation by adopting a non-contact connecting device, the magnetic fields generated by each magnetic suspension motor can be synchronous and same or asynchronous (such as an eddy current driver).
Specifically, another arrangement of the present invention is as follows: the rotor of the single magnetic suspension motor is divided into a plurality of rotor shaft sections, and the adjacent rotor shaft sections are axially butted through a torque transmission device (mainly a non-contact connecting device).
The invention further discloses a turbine motor system comprising a compressor or a pump or a generator or an expander, which uses a magnetic levitation motor having the above-mentioned features. Namely, the magnetic suspension rotor is provided with a non-contact type connecting device at the shaft end so as to realize the torque transmission of the rotor shafts of a plurality of motors on the same axis or the torque transmission of different rotor shaft sections in the same motor on the same axis.
The invention has the advantages that: the high-speed work of the long and thin rotor of the magnetic suspension motor can be realized, and the magnetic suspension motor can obtain the capacity of higher rotating speed under the condition of longer axial length.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a schematic diagram of a plurality of short-shaft-length magnetic levitation motors connected by a non-contact type connecting device;
FIG. 2 is a schematic diagram of a plurality of rotor shaft segments connected by a non-contact type connecting device in a single magnetic suspension motor;
FIG. 3 is a schematic diagram of deformation of a rotor at a first order critical speed;
FIG. 4 is a schematic diagram of the deformation that occurs at critical speed after the rotor is divided into a number of shorter rotor shaft segments;
wherein, 1, rotor; 11. rotor shaft segmentation; 2. a stator; 3. a contactless connecting device.
Detailed Description
Example 1:
a high critical speed magnetic levitation motor comprising: a magnetic suspension rotor and a magnetic suspension stator; the magnetic suspension rotor is provided with a non-contact connecting device at the shaft end so as to realize the torque transmission of the rotor shafts of a plurality of motors on the same axis.
Therefore, a plurality of magnetic suspension motors with short axial lengths are connected and arranged, and adjacent magnetic suspension motors are axially butted through non-contact type connecting devices at the end parts of the magnetic suspension rotor shafts. When a plurality of magnetic suspension motors with short shaft lengths are in butt joint operation by adopting a non-contact type connecting device, the magnetic fields generated by the magnetic suspension motors are synchronous and identical.
As shown in fig. 1, the rotor 1, the stator 2, and the noncontact connecting device 3 are included. When the magnetic suspension motor works, the rotor 1 rotates at a high speed, the non-contact type connecting device 3 is used as an intermediate medium to be connected with the magnetic suspension motors at two ends, and only torque is transmitted. Because the critical rotating speed of each of the rotors with shorter lengths is higher, the integral rotating speed of the connected motor is also improved.
Example 2:
a high critical speed magnetic levitation motor comprising: a magnetic suspension rotor and a magnetic suspension stator; the magnetic suspension rotor is provided with a non-contact connecting device at the shaft end so as to realize the torque transmission of adjacent rotor shaft segments in the same motor on the same axial line.
Thus, a single magnetic levitation motor is used, the rotor of which is divided into several rotor shaft segments, with adjacent rotor shaft segments being axially butted by means of a contactless connection.
In the embodiment shown in fig. 2, a magnetic levitation motor is used in this embodiment, the rotor is divided into a plurality of rotor shaft segments with short lengths, and adjacent rotor shaft segments are connected by a non-contact connecting device 3. After the rotor is divided into a plurality of rotor shaft sections with shorter lengths, the critical rotating speed of each rotor shaft section is independent.
The embodiments are merely illustrative of the principles and effects of the present invention, and do not limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed herein be covered by the appended claims.
Claims (10)
1. A high critical speed magnetic levitation motor comprising: the magnetic suspension rotor, the magnetic suspension stator and the torque transmission device; the method is characterized in that: the magnetic suspension rotor is provided with a torque transmission device at the shaft end so as to realize the torque transmission among the rotor shafts of a plurality of motors or the torque transmission among adjacent rotor shaft sections in the same motor.
2. A high critical speed magnetic levitation motor as recited in claim 1, wherein: the torque transmitting device includes a non-contact coupling device.
3. A high critical speed magnetic levitation motor as recited in claim 1, wherein: the torque transfer device transfers torque in a direction coaxial with the rotor axis.
4. A high critical speed magnetic levitation motor as recited in claim 1, wherein: the magnetic suspension motor comprises a plurality of magnetic suspension motors with short shaft lengths, and adjacent magnetic suspension motors are butted through torque transmission devices at the end parts of magnetic suspension rotor shafts.
5. A high critical speed magnetic levitation motor as recited in claim 1, wherein: the magnetic suspension motor comprises a single magnetic suspension motor, a rotor of the single magnetic suspension motor is divided into a plurality of rotor shaft sections, and adjacent rotor shaft sections are butted through a torque transmission device.
6. A high critical speed magnetic levitation motor as recited in claim 2 or 3, wherein: the torque transfer device comprises a non-contacting coupling device including, but not limited to: magnetic coupling, flexible coupling, magnetic eddy current actuator.
7. A high critical speed magnetic levitation motor as recited in claim 2, wherein: when the magnetic suspension motors with the short shaft lengths are in butt joint operation by adopting the non-contact connecting device, the rotating magnetic fields generated by the magnetic suspension motors are synchronous and identical.
8. A high critical speed magnetic levitation motor as recited in claim 2, wherein: when the magnetic suspension motors with the short shaft lengths are in butt joint operation by adopting the non-contact connecting device, the rotating magnetic fields generated by the magnetic suspension motors are different.
9. A high critical speed magnetic levitation motor as recited in claim 6, wherein: the magnetic coupler can be a radial coupling moment type magnetic coupler or an axial coupling moment type magnetic coupler.
10. A turbine motor system of a high critical speed magnetic levitation motor arrangement as claimed in claim 1 wherein: including a compressor or a pump or a generator or an expander, using a magnetically levitated motor comprising: the magnetic suspension rotor, the magnetic suspension stator and the torque transmission device; the magnetically levitated rotor is provided with torque transfer means at the shaft ends to enable torque transfer between rotor shafts of multiple motors or between adjacent rotor shaft segments in the same motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011578660.XA CN112615567A (en) | 2020-12-28 | 2020-12-28 | Magnetic suspension motor and turbine motor system with high critical rotating speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011578660.XA CN112615567A (en) | 2020-12-28 | 2020-12-28 | Magnetic suspension motor and turbine motor system with high critical rotating speed |
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| Publication Number | Publication Date |
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| CN112615567A true CN112615567A (en) | 2021-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011578660.XA Pending CN112615567A (en) | 2020-12-28 | 2020-12-28 | Magnetic suspension motor and turbine motor system with high critical rotating speed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023278509A1 (en) * | 2021-06-30 | 2023-01-05 | Bryan Prucher | Synchronized dual radial gap motor cluster assembly |
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2020
- 2020-12-28 CN CN202011578660.XA patent/CN112615567A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023278509A1 (en) * | 2021-06-30 | 2023-01-05 | Bryan Prucher | Synchronized dual radial gap motor cluster assembly |
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