CN113098329A - Magnetic suspension starting generator - Google Patents
Magnetic suspension starting generator Download PDFInfo
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- CN113098329A CN113098329A CN202110424426.XA CN202110424426A CN113098329A CN 113098329 A CN113098329 A CN 113098329A CN 202110424426 A CN202110424426 A CN 202110424426A CN 113098329 A CN113098329 A CN 113098329A
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- generator
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- permanent magnet
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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
Abstract
The invention discloses a magnetic suspension starting generator which comprises a permanent magnet synchronous generator, a first bearingless switched reluctance starting generator, a second bearingless switched reluctance starting generator and an axial magnetic bearing. The permanent magnet synchronous generator rotor, the axial magnetic bearing rotor, the first bearingless switched reluctance starter generator rotor and the second bearingless switched reluctance starter generator rotor share a rotating shaft. The permanent magnet synchronous generator mainly provides axial passive suspension force and generates electricity; the first bearingless switch reluctance starter generator and the second bearingless switch reluctance starter generator provide starting torque, radial suspension force and power generation; the axial magnetic bearing provides axial active suspension force, and the five-freedom suspension and starting power generation functions of the system are realized. The invention integrates the motor, the generator and the magnetic bearing into a whole, has the characteristic of high integration, can ensure the high efficiency, high power density and reliability of a starting power generation system, and can also play the characteristics of high speed, no friction, low maintenance and the like of the magnetic bearing.
Description
Technical Field
The invention relates to a magnetic suspension starting generator, belonging to the technical field of magnetic suspension switched reluctance motors of motors.
Background
In the development process of a multi-electric airplane, the starting power generation technology adopted by an aircraft engine is based on a traditional permanent magnet motor, although the motor has higher operation efficiency, a mechanical bearing is adopted by a motor rotor supporting part, and for the high-temperature application environment of the aircraft engine, the failure of a lubricant in the mechanical bearing is easily caused, the power generation efficiency of a system is influenced, and meanwhile, the reliability is also reduced. In order to solve the problem, a magnetic bearing is adopted to replace a mechanical bearing, instability caused by the mechanical bearing is avoided, and although the friction problem is solved, the space occupancy rate of the starter generator is increased due to the introduction of the magnetic bearing. The bearing-free switched reluctance starting generator technology combining the suspension technology and the generator technology is introduced to replace the original magnetic bearing, so that the rotor suspension is realized, and the service life of the system is prolonged; the power generation characteristic of the bearingless switched reluctance motor is used as a power supply backup of the permanent magnet synchronous generator, and the reliability and the output electric power are improved. The magnetic suspension starter generator has high efficiency, high power density, high integration and strong fault-tolerant capability, and is one of better schemes as the starter generator. Therefore, it is a difficult point of current research to achieve high efficiency and high power density of the system.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the magnetic suspension starting generator integrates the motor, the generator and the magnetic bearing, and has the characteristics of high efficiency, high power density, high integration and the like.
The invention adopts the following technical scheme for solving the technical problems:
a magnetic suspension starting generator comprises a permanent magnet synchronous generator, a first bearingless switched reluctance starting generator, a second bearingless switched reluctance starting generator, an axial magnetic bearing and a rotating shaft; the permanent magnet synchronous generator is positioned between the first bearingless switched reluctance starter generator and the second bearingless switched reluctance starter generator; the permanent magnet synchronous generator comprises a rotor, a stator, an armature winding and permanent magnets, wherein the permanent magnets are arranged on the outer surface of the rotor, the rotor is nested in the stator, and the armature winding is arranged in a stator tooth slot; the first bearingless switched reluctance starter generator and the second bearingless switched reluctance starter generator are identical in structure, the first bearingless switched reluctance starter generator comprises a first rotor, a first stator and a first excitation winding, the second bearingless switched reluctance starter generator comprises a second rotor, a second stator and a second excitation winding, the first rotor is nested in the first stator, the second rotor is nested in the second stator, the first excitation winding is nested in a first stator tooth groove, and the second excitation winding is nested in a second stator tooth groove; the axial magnetic bearing comprises an axial excitation winding, an axial magnetic bearing rotor and an axial magnetic bearing stator, wherein the axial magnetic bearing rotor is clamped in the axial magnetic bearing stator, and the axial excitation winding is arranged in a tooth slot of the axial magnetic bearing stator; the rotor, the first rotor, the second rotor and the axial magnetic bearing rotor of the permanent magnet synchronous generator share a rotating shaft, the axial length of the rotor of the permanent magnet synchronous generator is greater than the axial length of the stator, the axial length of the first rotor is greater than the axial length of the first stator, and the axial length of the second rotor is greater than the axial length of the second stator.
As a preferable aspect of the present invention, the axial magnetic bearing is located between the first bearingless switched reluctance starter generator and the permanent magnet synchronous generator, or between the permanent magnet synchronous generator and the second bearingless switched reluctance starter generator, or on an end portion side of the first bearingless switched reluctance starter generator which is far from the permanent magnet synchronous generator, or on an end portion side of the second bearingless switched reluctance starter generator which is far from the permanent magnet synchronous generator.
In a preferred embodiment of the present invention, the teeth of the first rotor are offset from the teeth of the second rotor by a mechanical angle of 15 °.
In a preferred embodiment of the present invention, the number of the slots of the permanent magnet synchronous generator is 24, and the number of the pole pairs is 2.
In a preferred embodiment of the present invention, the number of teeth of the first stator and the second stator is 12, and the number of teeth of the first rotor and the second rotor is 4.
As a preferred scheme of the present invention, the armature winding of the permanent magnet synchronous generator controls the permanent magnet synchronous generator to convert mechanical energy into electrical energy, and the armature winding and the permanent magnet of the permanent magnet synchronous generator provide an axial passive magnetic pull force; the axial magnetic bearing provides axial suspension force and is matched with passive magnetic pulling force of the permanent magnet synchronous generator to realize axial suspension of the magnetic suspension starting generator; the first excitation winding and the second excitation winding are conducted to realize radial suspension of the first rotor, the second rotor and the permanent magnet synchronous generator rotor.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the invention adopts a parallel integration mode of a permanent magnet synchronous generator and a bearingless switched reluctance starter generator to realize the five-freedom suspension and starting power generation functions of the system.
2. The invention provides axial suspension force through the permanent magnet synchronous generator and the bearingless switched reluctance starter generator, thereby realizing the axial suspension of the system.
3. The invention combines the high efficiency characteristic of the permanent magnet synchronous generator with the high integration of the bearingless switched reluctance motor, and improves the efficiency and the reliability of the starting power generation system.
Drawings
Fig. 1 is a schematic three-dimensional structure diagram of a magnetic suspension starter generator of the invention.
Fig. 2 is an axial schematic view of a permanent magnet synchronous generator of a magnetic levitation starter generator of the present invention.
Fig. 3 is a torque and axial force profile of a permanent magnet synchronous generator of a magnetic levitation starter generator of the present invention.
Fig. 4 is a schematic diagram of inductance distribution of first and second bearingless switched reluctance starter generators of a magnetic levitation starter generator of the present invention.
Fig. 5 is a sectional view of an axial magnetic bearing of the five-degree-of-freedom magnetic levitation motor of the present invention.
The permanent magnet synchronous generator comprises a first excitation winding 1, a first stator 2, a first rotor 3, an axial excitation winding 4, an axial magnetic bearing rotor 5, an axial magnetic bearing stator 6, a permanent magnet synchronous generator rotor 7, a permanent magnet synchronous generator stator 8, a permanent magnet 9, a permanent magnet synchronous generator armature winding 10, a rotating shaft 11, a second stator 12, a second rotor 13 and a second excitation winding 14.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1, the three-dimensional structure diagram of the magnetic suspension starter generator provided by the invention comprises: the system comprises a first bearingless switched reluctance motor, a second bearingless switched reluctance motor, a permanent magnet synchronous generator and an axial magnetic bearing. The first bearingless switched reluctance starter generator and the second bearingless switched reluctance starter generator are identical in structure, the first bearingless switched reluctance starter generator motor is composed of a first rotor 3, a first stator 2 and a first excitation winding 1, and the second bearingless switched reluctance starter generator is composed of a second rotor 13, a second stator 12 and a second excitation winding 14. The permanent magnet synchronous generator consists of a rotor 7, a stator 8, an armature winding 10 and a permanent magnet 9, wherein the rotor 7 is nested inside the stator 8, the permanent magnet 9 is arranged between the rotor 7 and the stator 8, and the permanent magnet 9 is in contact with the outer surface of the rotor 7 and is not in contact with the inner surface of the stator 8. The axial magnetic bearing is composed of an axial magnetic bearing stator 6, an axial magnetic bearing rotor 5 and an axial excitation winding 4, wherein the axial excitation winding is nested inside the stator, and the axial magnetic bearing rotor is clamped by the axial magnetic bearing stator. The axial magnetic bearing rotor 5, the rotor 7 of the permanent magnet synchronous generator and the first rotor 3 and the second rotor 13 in the first and second bearingless switched reluctance starter generators share a rotating shaft 11.
The two bearingless switched reluctance starter generators are positioned at two sides of the permanent magnet synchronous generator, the axial magnetic bearing is not limited to be positioned between the first bearingless switched reluctance starter generator and the permanent magnet synchronous generator, and can also be positioned at the left end part of the first bearingless switched reluctance starter generator, or between the second bearingless switched reluctance starter generator and the permanent magnet synchronous generator, or at the right end part of the second bearingless switched reluctance starter generator.
The axial length of the rotor of the permanent magnet synchronous generator is longer than that of the stator, and the permanent magnet synchronous generator is used for generating certain axial passive magnetic pulling force. Similarly, the first and second bearingless switched reluctance motors are similar to the permanent magnet synchronous generator, and the axial length of the first rotor is longer than that of the first stator, and the axial length of the second rotor is longer than that of the second stator, so as to provide axial passive reluctance force.
The rotor of the permanent magnet synchronous generator is nested inside the stator of the permanent magnet synchronous generator, the first rotor is nested inside the first stator, the second rotor is nested inside the second stator, the rotor of the permanent magnet synchronous generator, the first rotor and the second rotor are all nested on the rotating shaft, and the tooth poles of the first rotor and the second rotor are staggered by 15-degree mechanical angles, so that the torque dead zone of a single bearingless switched reluctance starter generator is made up, and efficient and stable starting and power generation of a system are realized. The armature winding of the permanent magnet synchronous generator is nested in the stator tooth slot of the permanent magnet synchronous generator, the first excitation winding is nested in the first stator tooth slot, and the second excitation winding is nested in the second stator tooth slot.
The armature winding of the permanent magnet synchronous generator controls the permanent magnet synchronous generator to convert mechanical energy into electric energy, and the armature winding and the permanent magnet of the permanent magnet synchronous generator provide axial passive magnetic tension; the axial magnetic bearing provides axial active suspension force and is matched with passive magnetic pulling force of the permanent magnet synchronous generator to realize axial suspension of the system; the first excitation winding and the second excitation winding are conducted to realize radial suspension of the first rotor, the second rotor and the rotor of the permanent magnet synchronous generator, and meanwhile, the first and second bearingless switched reluctance starter generators can be used as motors to provide starting torque and can also be used as generators.
The axial magnetic bearing provides axial active suspension force, the permanent magnet synchronous generator has the function of providing generating power and axial passive magnetic pull force, is matched with the axial magnetic bearing to stably suspend on the premise of reducing the bearing load of the axial magnetic bearing, and the first and second bearingless switched reluctance starting generators have the function of providing four-degree-of-freedom radial suspension force and generating power, so that the five-degree-of-freedom suspension and starting power generation functions of the system are realized.
The permanent magnet synchronous generator can be 2 pairs of poles, the number of tooth slots is 24, but the number of the pole pairs and the number of the tooth slots are not limited, and the axial length of the rotor is longer than that of the stator so as to generate axial passive magnetic pull force.
The number of poles of the stator and the rotor of the two bearingless switched reluctance motors can be 12/4 type, 12/8 type, 6/4 type and the like, but is not limited to the types, the first bearingless switched reluctance motor and the second bearingless switched reluctance motor provide starting torque, generating power and suspension force, the permanent magnet synchronous generator provides generating power and axial suspension force, and therefore starting, generating and suspension operation of the system are guaranteed.
Referring to fig. 2, the present invention provides an axial schematic diagram of a permanent magnet synchronous generator of a magnetically levitated starter generator, wherein the rotor of the permanent magnet synchronous generator has a longer axial length than the stator of the permanent magnet synchronous generator, so as to provide torque and axial levitating force.
As shown in fig. 3, the torque and axial force distribution diagram of the permanent magnet synchronous generator of the magnetic levitation starter generator provided by the invention has the abscissa as the axial displacement of the rotor, the left ordinate as the axial force, and the right ordinate as the torque, when the axial displacement of the rotor is from-5 mm to +5mm, the torque is basically lossless, the axial levitation force increases with the increase of the axial displacement, and the action direction of the force is opposite to the axial displacement direction of the rotor.
As shown in fig. 4, the inductance distribution schematic diagram of the first and second bearingless switched reluctance starter generators of the magnetic levitation starter generator provided by the invention is represented by T/E for torque/power generation and F for levitation, and provides starting torque and power generation functions on the premise of ensuring stable levitation in a full period.
As shown in fig. 5, the axial magnetic bearing of the five-degree-of-freedom magnetic levitation motor according to the present invention has a cross-sectional view, wherein the axial magnetic bearing includes an axial excitation winding, an axial magnetic bearing stator and a rotor, the axial magnetic bearing rotor is nested inside the axial magnetic bearing stator, and the axial magnetic bearing generates an asymmetric axial magnetic pull force by adjusting two sets of axial excitation windings to control the axial position of the axial rotor, thereby achieving axial levitation.
The invention provides a novel magnetic suspension starting generator, which utilizes a permanent magnet synchronous generator to provide power generation power and axial suspension force and utilizes a bearingless switched reluctance starting generator to provide torque, power generation power and radial suspension force. The permanent magnet synchronous generator is used as a main generator and provides axial suspension force, the first and second bearingless switched reluctance starter generators are used as starting motors for driving the rotating shaft to rotate in the starting stage of the power generation system, and are used as system power supplies after the power generation system is started, and radial four-degree-of-freedom suspension force is provided, so that the five-degree-of-freedom suspension function of the starter generator system is ensured. The magnetic suspension starting generator has the advantages of high efficiency, high power density, high integration level, strong fault-tolerant capability, good reliability and the like.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (6)
1. A magnetic suspension starting generator is characterized by comprising a permanent magnet synchronous generator, a first bearingless switched reluctance starting generator, a second bearingless switched reluctance starting generator, an axial magnetic bearing and a rotating shaft; the permanent magnet synchronous generator is positioned between the first bearingless switched reluctance starter generator and the second bearingless switched reluctance starter generator; the permanent magnet synchronous generator comprises a rotor, a stator, an armature winding and permanent magnets, wherein the permanent magnets are arranged on the outer surface of the rotor, the rotor is nested in the stator, and the armature winding is arranged in a stator tooth slot; the first bearingless switched reluctance starter generator and the second bearingless switched reluctance starter generator are identical in structure, the first bearingless switched reluctance starter generator comprises a first rotor, a first stator and a first excitation winding, the second bearingless switched reluctance starter generator comprises a second rotor, a second stator and a second excitation winding, the first rotor is nested in the first stator, the second rotor is nested in the second stator, the first excitation winding is nested in a first stator tooth groove, and the second excitation winding is nested in a second stator tooth groove; the axial magnetic bearing comprises an axial excitation winding, an axial magnetic bearing rotor and an axial magnetic bearing stator, wherein the axial magnetic bearing rotor is clamped in the axial magnetic bearing stator, and the axial excitation winding is arranged in a tooth slot of the axial magnetic bearing stator; the rotor, the first rotor, the second rotor and the axial magnetic bearing rotor of the permanent magnet synchronous generator share a rotating shaft, the axial length of the rotor of the permanent magnet synchronous generator is greater than the axial length of the stator, the axial length of the first rotor is greater than the axial length of the first stator, and the axial length of the second rotor is greater than the axial length of the second stator.
2. The maglev starter-generator of claim 1, wherein the axial magnetic bearing is located between the first bearingless switched reluctance starter-generator and the permanent magnet synchronous generator, or between the permanent magnet synchronous generator and the second bearingless switched reluctance starter-generator, or on an end side of the first bearingless switched reluctance starter-generator distal from the permanent magnet synchronous generator, or on an end side of the second bearingless switched reluctance starter-generator distal from the permanent magnet synchronous generator.
3. The magnetic levitation starter-generator of claim 1, wherein the teeth of the first rotor are staggered from the teeth of the second rotor by a mechanical angle of 15 °.
4. The magnetic levitation starter-generator of claim 1, wherein the number of slots of the permanent magnet synchronous generator is 24 and the number of pole pairs is 2.
5. The magnetic suspension starting generator of claim 1, wherein the number of teeth of the first stator and the second stator is 12, and the number of teeth of the first rotor and the second rotor is 4.
6. The magnetic suspension starting generator according to claim 1, wherein the armature winding of the permanent magnet synchronous generator controls the permanent magnet synchronous generator to convert mechanical energy into electric energy, and the armature winding and the permanent magnet of the permanent magnet synchronous generator provide axial passive magnetic pull force; the axial magnetic bearing provides axial suspension force and is matched with passive magnetic pulling force of the permanent magnet synchronous generator to realize axial suspension of the magnetic suspension starting generator; the first excitation winding and the second excitation winding are conducted to realize radial suspension of the first rotor, the second rotor and the permanent magnet synchronous generator rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110424426.XA CN113098329A (en) | 2021-04-20 | 2021-04-20 | Magnetic suspension starting generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110424426.XA CN113098329A (en) | 2021-04-20 | 2021-04-20 | Magnetic suspension starting generator |
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| CN113098329A true CN113098329A (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110424426.XA Pending CN113098329A (en) | 2021-04-20 | 2021-04-20 | Magnetic suspension starting generator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113833678A (en) * | 2021-09-16 | 2021-12-24 | 河北农业大学 | Gas compressor |
| CN114257054A (en) * | 2021-12-23 | 2022-03-29 | 樟树市菜瓜科技有限公司 | Energy-saving and environment-friendly efficient generator with electric power storage function |
-
2021
- 2021-04-20 CN CN202110424426.XA patent/CN113098329A/en active Pending
Non-Patent Citations (5)
| Title |
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| 于立 等: "《多电发动机内装式高速起动发电机研究与实践》", 《中国电机工程学报》 * |
| 刘从宇: "《单绕组12/4极无轴承开关磁阻电机及其控制方法研究》", 《中国优秀硕士学位论文全文数据库（工程科技Ⅱ辑）》 * |
| 徐建淳: "《高速永磁发电系统及其调压器的研究》", 《中国优秀硕士学位论文全文数据库（工程科技Ⅱ辑）》 * |
| 李保来: "《基于二维电磁场仿真电机轴向力的计算方法》", 《微电机》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113833678A (en) * | 2021-09-16 | 2021-12-24 | 河北农业大学 | Gas compressor |
| CN114257054A (en) * | 2021-12-23 | 2022-03-29 | 樟树市菜瓜科技有限公司 | Energy-saving and environment-friendly efficient generator with electric power storage function |
| CN114257054B (en) * | 2021-12-23 | 2023-09-26 | 陆河县鸿泰水电开发有限公司 | Energy-saving and environment-friendly efficient generator with power storage function |
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Application publication date: 20210709 |