CN217216235U

CN217216235U - Air damping centrifugal assembly for permanent magnet synchronous motor

Info

Publication number: CN217216235U
Application number: CN202220265626.5U
Authority: CN
Inventors: 钱凤军; 罗业富; 何刚
Original assignee: China Magnetism Power Equipment Shenzhen Co ltd
Current assignee: China Magnetism Power Equipment Shenzhen Co ltd
Priority date: 2022-02-09
Filing date: 2022-02-09
Publication date: 2022-08-16
Anticipated expiration: 2032-02-09

Abstract

The utility model discloses an air damping centrifugal component for a permanent magnet synchronous motor, which comprises a rotor and a rotor core matched with the rotor, wherein the rotor core is in sliding fit on the end surface of the rotor along the radial direction; the rotor comprises a rotor core, and is characterized by further comprising a damping cylinder arranged on the end face of the rotor and located on the radial outer side of the rotor core, and a piston located in the damping cylinder, wherein the piston is fixedly connected with the rotor core, and an air inlet hole and an air outlet hole are formed in the damping cylinder. An object of the utility model is to provide an air damping centrifugation subassembly for PMSM to the realization provides the purpose of damping buffering to PMSM's rotor core's radial outward motion.

Description

Air damping centrifugal assembly for permanent magnet synchronous motor

Technical Field

The utility model relates to a PMSM field, concretely relates to air damping centrifugation subassembly for PMSM.

Background

With the rapid development and research of scientific technology, especially the arrival of the information digital era, the development of an electric drive system towards high power, high efficiency, wide speed range, high torque, high performance volume ratio and the like is urgently needed, and from the development trend of international science and technology, the efficient and energy-saving variable frequency drive is an important development direction in the main national economy fields of industrial control, household appliances, transportation and the like.

Along with the gradual improvement of the frequency conversion technology, the permanent magnet synchronous motor and the frequency conversion control technology realize the electromechanical integration, so that the advantages of the permanent magnet synchronous motor driving system are more and more obvious. Especially, the rare earth permanent magnet synchronous motor combines the characteristic of abundant rare earth elements in China, and adopts high-performance rare earth permanent magnet materials to generate an excitation magnetic field for the synchronous motor, so that the operating efficiency and the power factor of the motor are greatly improved. The driving system has the advantages of high speed regulation precision, large speed regulation ratio, good output characteristic and stable operation. In addition, the system has the characteristics of constant torque output and no fluctuation of the rotating speed along with the load. The frequency converter is effectively controlled, so that the output rotating speed of the frequency converter can be kept constant, and a speed reducer is omitted in some mechanical transmission, which undoubtedly brings a new revolution to the whole mechanical manufacture.

However, since the permanent magnet synchronous motor adopts permanent magnet excitation, the magnetic field is constant, the excitation strength of the permanent magnet cannot be adjusted, and in a constant power operation area above the basic speed, along with the increase of the rotating speed, the electromagnetic torque performance of the PMSM is seriously damaged due to the limitation of the power supply voltage and the saturation influence of the current controller, so that the PMSM cannot be operated to a higher rotating speed and perform constant power operation at a high speed, which seriously limits the application range of the PMSM.

The technical research and development aiming at adjusting the air gap field of the permanent magnet motor to realize the constant-power speed change becomes one of the hot spots. In order to widen the speed regulation range of the permanent magnet motor and improve the operation efficiency of a system in a region above a basic speed, the applicant of the present application researches a motor with automatic stepless variable power speed regulation, and the principle of the motor is that a rotor core slides outwards in the radial direction of the end face of a rotor by using centrifugal force under the working condition of high-speed rotation to realize a flux weakening effect. However, when the motor is started, the sudden increase of the centrifugal force easily causes the rotor core to move rapidly outwards suddenly, which is not beneficial to the long-term use of the motor, and a damping device suitable for the rotor core is not available in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an air damping centrifugation subassembly for PMSM to the realization provides the purpose of damping buffering to PMSM's rotor core's radial outward movement.

The utility model discloses a following technical scheme realizes:

the air damping centrifugal assembly for the permanent magnet synchronous motor comprises a rotor and a rotor core matched with the rotor, wherein the rotor core is in sliding fit on the end surface of the rotor along the radial direction; the rotor comprises a rotor core, and is characterized by further comprising a damping cylinder arranged on the end face of the rotor and located on the radial outer side of the rotor core, and a piston located in the damping cylinder, wherein the piston is fixedly connected with the rotor core, and an air inlet hole and an air outlet hole are formed in the damping cylinder.

Rotor core can be along radially outside quick movement, striking impaired and be unfavorable for stably carrying out the problem of variable work speed governing easily among the prior art, the utility model provides an air damping centrifugation subassembly for PMSM, wherein rotor, rotor core are prior art and do not do here and give unnecessary detail. This application is with rotor core sliding fit on the rotor terminal surface, and makes rotor core's slip direction be the radial direction along the rotor terminal surface, when the rotor rotates at a high speed, utilizes centrifugal force to make rotor core radially outwards slide for magnetic field intensity between rotor and the assorted stator weakens gradually, has realized the automatic work variable speed governing function of the weak magnetism under the high-speed operation of motor. This application sets up the damping cylinder on the terminal surface of rotor, and makes the damping cylinder be located rotor core along radial outside, because rotor core is connected with the piston of damping cylinder, consequently when rotor core along radial outside motion, can push away and promote the synchronous outside motion of this piston, and the air is discharged from the gas outlet, utilizes air resistance to realize providing damped effect to rotor core: because the resistance of air exists, the piston can not move rapidly in the cylinder, so that the rotor core can not slide radially outwards rapidly, and the buffering effect is realized.

Of course, as is common knowledge in the art, the rotor and the rotor core of the present application must be used in cooperation with a mating stator during operation.

Furthermore, a one-way valve is arranged at the air inlet and is communicated towards the direction of entering the damping cylinder. The air inlet hole is an air inlet channel of the damping cylinder, and when the piston shrinks inwards in the damping cylinder, air can automatically enter the damping cylinder through the air inlet hole. The check valve can only allow external air to enter the damping cylinder through the air inlet hole, and air in the damping cylinder cannot be discharged through the air inlet hole, so that the fact that the air in the damping cylinder must be discharged through the air outlet hole is guaranteed, and the effect of stably providing damping buffering is guaranteed.

Furthermore, the flow area of the air inlet hole is larger than that of the air outlet hole. According to the scheme, the air outlet holes are provided with the apertures with relatively smaller flow areas, so that when the piston moves outwards, air in the damping cylinder is gradually extruded and gradually discharged through the air outlet holes, and the good buffering effect can be provided by utilizing the compressibility of the air in the process; of course, when the piston moves inwards to need air intake, the air inlet hole with the large flow area can enable air to enter the damping cylinder quickly.

Furthermore, the device also comprises a balancing weight fixedly connected with the piston. The setting through the balancing weight can multiplicable centrifugal part's in this application weight (be rotor core, piston etc. receive the total weight of the object that centrifugal force effect carried out the motion promptly), can suitably reduce centrifugal part's volume, and then reduce the volume of whole motor. In addition, because the balancing weight has great mass, its centrifugal force is great, and the balancing weight radially outwards moves when the rotor is rotated at a high speed, can also stimulate the rotor core motion, guarantees the effect of automatic weak magnetic variation work more.

Furthermore, the balancing weight is fixed on the outer side of the piston in the radial direction and moves together with the piston in the damping cylinder.

Further, the anti-collision device further comprises an anti-collision cushion located in the radial outer side direction of the piston. The anti-collision pad is used for avoiding the piston to directly contact with the cylinder wall, reduces collision impact strength, improves the life of this application more. The crash pad can be made of any crash-proof material or flexible material known in the art.

Furthermore, the piston is fixedly connected with the rotor iron core through a piston rod.

Furthermore, one end of the piston rod is connected to the outer side wall of the rotor core, and the other end of the piston rod is connected to the inner side wall of the piston. The inner and outer in this embodiment refer to the inner diameter side and the outer diameter side in the radial direction.

Furthermore, the magnetic rotor also comprises a rotor magnet arranged on the rotor iron core.

Furthermore, the rotor is fixedly sleeved on the rotor support, and the rotor support is provided with a shaft hole. Those skilled in the art will appreciate that the shaft bore is for the motor shaft to pass through.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the utility model discloses an air damping centrifugation subassembly for PMSM when rotor core along radial outward movement, can push away and promote the synchronous outward movement of piston, utilizes air resistance to realize providing damped buffering effect to rotor core.

2. The utility model is used for PMSM's air damping centrifugation subassembly can suitably reduce the volume of motor through the balancing weight.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a cross-sectional view of an embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

1-rotor, 2-rotor iron core, 6-rotor magnet, 7-rotor support, 9-damping cylinder, 10-piston, 11-air inlet, 12-air outlet, 13-one-way valve, 14-counterweight block, and 15-anti-collision pad.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

Example 1:

the air damping centrifugal assembly for the permanent magnet synchronous motor shown in fig. 1 comprises a rotor 1 and a rotor core 2 matched with the rotor 1, wherein the rotor core 2 is in sliding fit on the end surface of the rotor 1 along the radial direction; the rotor comprises a rotor core 2 and is characterized by further comprising a damping cylinder 9 arranged on the end face of the rotor 1 and located on the radial outer side of the rotor core 2 and a piston 10 located in the damping cylinder 9, wherein the piston 10 is fixedly connected with the rotor core 2, and an air inlet hole 11 and an air outlet hole 12 are formed in the damping cylinder 9. And a check valve 13 is arranged at the air inlet hole 11, and the check valve 13 is communicated towards the direction of entering the interior of the damping cylinder 9.

Preferably, the flow area of the inlet holes 11 is larger than that of the outlet holes 12.

Example 2:

the air damping centrifugal assembly for the permanent magnet synchronous motor further comprises a balancing weight 14 fixedly connected with the piston 10 on the basis of embodiment 1. The weight 14 is fixed to the radially outer side of the piston 10. And a crash pad 15 located radially outward of the piston 10.

Wherein, piston 10 and rotor core 2 are connected fixedly through the piston rod. One end of the piston rod is connected to the outer side wall of the rotor core 2, and the other end of the piston rod is connected to the inner side wall of the piston 10.

Preferably, a rotor magnet 6 is included, mounted on the rotor core, for cooperating with the stator.

Preferably, the rotor 1 is fixedly sleeved on the rotor support 7, and the rotor support 7 is provided with a shaft hole.

Preferably, the present embodiment further has a sliding track which is matched with the balancing weight and distributed along the radial direction, and the sliding track can be a sliding rail, a sliding chute, an opening, and the like, and can realize the limitation of the moving direction of all the centrifugal components.

Preferably, the anti-collision pad is installed on the balancing weight, and the anti-collision pad and the piston are located on two sides of the balancing weight respectively.

It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Further, the term "connected" used herein may be directly connected or indirectly connected via other components without being particularly described.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The air damping centrifugal assembly for the permanent magnet synchronous motor comprises a rotor (1) and a rotor core (2) matched with the rotor (1), and is characterized in that the rotor core (2) is in sliding fit on the end face of the rotor (1) along the radial direction; the rotor is characterized by further comprising a damping cylinder (9) arranged on the end face of the rotor (1) and located on the radial outer side of the rotor core (2), and a piston (10) located in the damping cylinder (9), wherein the piston (10) is fixedly connected with the rotor core (2), and an air inlet hole (11) and an air outlet hole (12) are formed in the damping cylinder (9).

2. Air damping centrifugal assembly for a permanent magnet synchronous machine according to claim 1, characterized in that a one-way valve (13) is arranged at the air inlet hole (11), the one-way valve (13) being open towards the direction into the interior of the damping cylinder (9).

3. Air damping centrifugal assembly for permanent magnet synchronous machines according to claim 1, characterized in that the flow area of the inlet holes (11) is larger than the flow area of the outlet holes (12).

4. The air-damped centrifugal assembly for a permanent magnet synchronous machine according to claim 1, further comprising a counterweight (14) fixedly connected to the piston (10).

5. Air damping centrifugal assembly for a permanent magnet synchronous machine according to claim 4, characterized in that the balancing weight (14) is fixed radially outside the piston (10).

6. The air-damped centrifugal assembly for a permanent magnet synchronous machine according to claim 1, further comprising a crash pad (15) located radially outside the piston (10).

7. Air damping centrifugal assembly for a permanent magnet synchronous machine according to claim 1, characterized in that the piston (10) is fixedly connected with the rotor core (2) by a piston rod.

8. Air damping centrifugal assembly for a permanent magnet synchronous machine according to claim 1, characterized in that the piston rod is connected at one end to the outer side wall of the rotor core (2) and at the other end to the inner side wall of the piston (10).

9. The air-damped centrifugal assembly for a permanent magnet synchronous machine according to claim 1, further comprising rotor magnets (6) mounted on the rotor core (2).

10. The air damping centrifugal assembly for the permanent magnet synchronous motor according to claim 1, wherein the rotor (1) is fixedly sleeved on a rotor bracket (7), and a shaft hole is formed in the rotor bracket (7).