Magnetism adjusting motor with stator permanent magnet capable of axially translating

Abstract

The utility model relates to a flux-adjusting motor with a stator permanent magnet capable of axially translating, which comprises a salient pole rotor, a stator and permanent magnet magnetic steel, the salient pole rotor, the stator and the permanent magnet magnetic steel are coaxially arranged, the axial positions of the salient pole rotor and the stator are fixed, the permanent magnet magnetic steel is statically arranged between the salient pole rotor and the stator, and the permanent magnet magnetic steel is arranged between the salient pole rotor and the stator. One end of the permanent magnet magnetic steel is connected with a magnetic adjusting device, and the magnetic adjusting device is used for adjusting the axial position of the permanent magnet magnetic steel. By arranging the permanent magnet axial translation device, the position of the permanent magnet can be adjusted according to different application scene requirements of the motor, the adjustment effect on the no-load counter electromotive force amplitude and the no-load iron loss of the motor is good, and the permanent magnet axial translation device has the advantages of simplicity in magnetic adjustment, low idling loss, simple structure, high reliability and the like; the method is especially suitable for power system energy storage motors and synchronous phase modulation motors.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic modulation motors, in particular to a magnetic modulation motor with a stator permanent magnet capable of axial translation, which is suitable for energy storage motors and synchronous phase modulation motors in power systems. Background Art

[0002] Compared with traditional rotor-excited permanent magnet motors, stator-excited permanent magnet motors have the advantages of simple rotor structure and very high reliability, and are widely used in new energy power systems. Stator-excited permanent magnet motors are divided into adjustable magnetic motors and non-adjustable magnetic motors according to whether the air gap magnetic field is adjustable. Among them, the adjustable magnetic motor has good air gap magnetic field adjustment performance and has more advantages than the non-adjustable magnetic motor. At present, the adjustable magnetic motors with stator excitation permanent magnets generally have the problem of low reliability due to the complexity of the magnetic adjustment device.

[0003] For example, CN110752735B discloses a disc-type magnetic gear using a magnetic focusing type magnetic adjustment device, comprising an active disc assembly and a driven disc assembly, wherein the driven disc assembly comprises a driven shaft, a driven shaft sleeve, a driven disc base, a driven disc permanent magnet and a screw, wherein the left end of the driven shaft is connected to the driven shaft sleeve by a key, the left side of the driven shaft sleeve is connected to the driven disc base by a screw, and the driven disc permanent magnet is closely arranged and mounted on the driven disc base; the active disc assembly comprises an active shaft, an active shaft sleeve, an active disc base, an active disc permanent magnet and a screw, wherein the right end of the active shaft is connected to the active shaft sleeve by a key, the right side of the active shaft sleeve is connected to the active disc base by a screw, and the active disc permanent magnet is closely arranged and mounted on the active disc base, and is characterized in that the magnetic adjustment device assembly is installed between the active disc assembly and the driven disc assembly, and the magnetic adjustment device assembly comprises a magnetic adjustment block, a magnetic adjustment block tray, and a magnetic adjustment block tray. The bracket and the end cover, the magnetic adjustment block is installed by the magnetic adjustment block tray and the magnetic adjustment block bracket, and the end cover is connected to the magnetic adjustment block tray to completely fix the magnetic adjustment block; the thickness of the magnetic adjustment part of the magnetic adjustment block is ht, which is the same as the thickness of the magnetic adjustment block tray, and its side is a 1 / 2 period sine curve expression of y = Asinωx, and the tooth groove side of the magnetic adjustment block tray adopts a 1 / 2 period sine curve matched with the side of the magnetic adjustment block; when the length of the magnetic focusing part is L, the thickness of the active disk and the driven disk permanent magnets are both h, the thickness of the active disk matrix and the driven disk matrix are both hfe, the thickness of the magnetic adjustment block tray is ht, considering the strength of the magnetic adjustment block, L≥2(hfe+h)+ht, at this time the magnetic adjustment block realizes the magnetic adjustment and magnetic focusing effects at the same time; the lower base angles of the approximate isosceles trapezoid of the side section of the magnetic adjustment block bracket slot and the approximate isosceles trapezoid of the magnetic adjustment block focusing part are both α, and α is between 60° and 75°. The present invention enhances the torque density of the magnetic gear by designing the structure of the magnetic adjustment device and the arrangement of the permanent magnets, but the structure is complex, the operation is cumbersome, and the use is relatively inconvenient.

[0004] In view of the above problems, the utility model proposes a magnetically adjustable motor with axially movable stator permanent magnet, which adjusts the no-load magnetic field and no-load back electromotive force of the motor. It has the advantages of low idle loss, simple structure, high reliability and simple magnetic adjustment, and is very suitable for use as an energy storage motor and a synchronous phase-modulated motor in power systems. Utility Model Content

[0005] The utility model provides a magnetically adjustable motor with a stator permanent magnet capable of axial translation.

[0006] The specific technical solution of the utility model is: a magnetically adjustable motor with axially movable stator permanent magnets, comprising a salient pole rotor, a stator and permanent magnet steel, wherein the salient pole rotor, the stator and the permanent magnet steel are coaxially arranged, the axial positions of the salient pole rotor and the stator are fixed, the permanent magnet steel is statically arranged between the salient pole rotor and the stator, one end of the permanent magnet steel is connected to a magnetically adjustable device, and the magnetically adjustable device is used to adjust the axial position of the permanent magnet steel.

[0007] Further, preferably, the magnetic adjustment device includes an end ring, one end of the end ring is connected to the permanent magnet steel, and the other end is connected to a lead screw, the lead screw passes through the stepper motor and is fixed on the end cover and extends to the outside of the end cover.

[0008] Further, preferably, the end ring is circular, and the circular cross-section is connected to the end of the permanent magnet.

[0009] Further, preferably, the permanent magnet magnetic steel is segmented along the axial direction.

[0010] Further, preferably, the salient pole rotor is located inside the stator.

[0011] Further, preferably, the salient pole rotor is located outside the stator.

[0012] Further, preferably, the stator comprises an armature winding and a stator core, and the number of pole pairs of the armature winding is equal to the number of salient poles of the salient pole rotor minus the number of pole pairs of the permanent magnet magnetic steel.

[0013] The beneficial effect of the utility model is that the utility model can adjust the position of the permanent magnet according to the requirements of different application scenarios of the motor by setting the permanent magnet axial translation device, and has a good adjustment effect on the no-load back electromotive force amplitude and no-load iron loss of the motor. It has the advantages of simple magnetic adjustment, low idle loss, simple structure, high reliability, etc., and is particularly suitable for energy storage motors and synchronous phase-modulated motors in power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0015] Figure 2 for Figure 1A partial enlarged view of

[0016] Figure 3 for Figure 1 The main view of the AA surface;

[0017] Figure 4 for Figure 1 The main view of the BB surface;

[0018] Figure 5 It is the relationship diagram between the motor no-load line back electromotive force amplitude and the axial translation distance of the permanent magnet;

[0019] Figure 6 It is the relationship diagram between the no-load iron loss of the motor and the axial translation distance of the permanent magnet;

[0020] In the figure: 1- salient pole rotor, 2- permanent magnet magnetic steel, 3- armature winding, 4- stator core, 501- end ring, 502- lead screw, 503 stepper motor, 6- end cover, 7- housing. Implementation

[0021] In order to make the technical problems and technical solutions solved by the utility model more clearly understood, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figures 1 to 4As shown, a magnetically adjustable motor with an axially movable stator permanent magnet comprises a salient pole rotor 1, a stator and a permanent magnet 2. The salient pole rotor 1, the stator and the permanent magnet 2 are coaxially arranged. The axial positions of the salient pole rotor 1 and the stator are fixed, but the radial positions can be that the salient pole rotor 1 is located on the inner side of the stator, or that the salient pole rotor 1 is located on the outer side of the stator. The permanent magnet 2 is statically arranged between the salient pole rotor 1 and the stator. A magnetically adjustable device is connected to one end of the permanent magnet 2, and the magnetically adjustable device is used to adjust the axial position of the permanent magnet 2.

[0025] Further preferably, the magnetic adjustment device includes an end ring 501, a lead screw 502 and a stepper motor 503. The end ring 501 is circular, and the circular cross section of one end thereof is connected to the end of the permanent magnet 2, and the other end is connected to the lead screw 502. The lead screw 502 passes through the rotor of the stepper motor 503 and is fixed on the end cover 6, and extends to the outside of the end cover 6. After the stepper motor 503 is started, it can drive the lead screw 502 to rotate, so that the lead screw 502 drives the permanent magnet 2 to move along the axial direction.

[0026] Further preferably, the stator includes an armature winding 3 and a stator core 4 , and the number of pole pairs of the armature winding 3 is equal to the number of salient poles of the salient pole rotor 1 minus the number of pole pairs of the permanent magnet 2 .

[0027] It is further preferred that the permanent magnet steel 2 is segmented along the axial direction, which can significantly reduce the eddy current loss of the permanent magnet steel 2.

[0028] The motor described in the utility model adopts Figure 1 In addition to the radial magnetic field structure shown, an axial magnetic field structure can also be used.

[0029] In order to verify the effect of the utility model, a force finite element simulation model was established and simulation calculations were performed. The simulation results show that the relationship between the no-load line back electromotive force amplitude and no-load iron loss of the stator permanent magnet axial translation adjustable magnetic motor and the axial translation distance of the permanent magnet magnetic steel is as follows: Figure 5 , Figure 6 As shown. It can be seen that the motor has good performance in adjusting the no-load back-EMF amplitude, and it can also be seen that the no-load iron loss of the stator permanent magnet axially movable magnetic motor can be as low as close to zero, so it is particularly suitable for power system energy storage motors and synchronous phase-modulated motors.

[0030] When used for synchronous phase-adjusting motors in power systems, the working principle of the motor described in the utility model is as follows: the armature winding 3 of the motor stator is connected to the power grid. Since the motor output shaft is unloaded, the motor input active power is always zero when the motor loss and the rotor mechanical transient process are ignored. At this time, the no-load back electromotive force amplitude of the motor can be adjusted by adjusting the axial position of the permanent magnet steel 2 through the magnetic adjustment device, so that the reactive power of the motor can be adjusted arbitrarily.

[0031] When used in an energy storage motor for an electric power system, the salient pole rotor 1 of the motor described in the utility model is located on the outside and the stator is located on the inside, and its working principle is as follows: when the motor is idling, the axial position of the permanent magnet steel 2 is adjusted by the magnetic adjustment device so that it is completely offset from the salient pole rotor 1 in the axial direction, thereby reducing the no-load magnetic field of the motor and effectively reducing the no-load loss of the motor; when the motor needs to accelerate or generate electricity, the axial position of the permanent magnet steel 2 is adjusted by the magnetic adjustment device 5 so that it is completely overlapped with the salient pole rotor 1 in the axial direction, and the no-load back electromotive force of the motor is a normal value.

[0032] The present invention is described in detail above through specific and preferred embodiments, but those skilled in the art should understand that the present invention is not limited to the embodiments described above, and any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetically adjustable motor with a stator permanent magnet capable of axial translation, comprising a salient pole rotor (1), a stator and a permanent magnet steel (2), characterized in that: The salient pole rotor (1), the stator and the permanent magnet steel (2) are coaxially arranged; the salient pole rotor (1) and the stator are fixed in axial position; the permanent magnet steel (2) is statically arranged between the salient pole rotor (1) and the stator; one end of the permanent magnet steel (2) is connected to a magnetic adjustment device, and the magnetic adjustment device is used to adjust the axial position of the permanent magnet steel (2).

2. A magnetically adjustable motor with axially movable stator permanent magnets according to claim 1, characterized in that: The magnetic adjustment device comprises an end ring (501), one end of the end ring (501) is connected to the permanent magnet steel (2), and the other end is connected to a lead screw (502), the lead screw (502) passes through a stepping motor (503), is fixed on the end cover (6), and extends to the outside of the end cover (6).

3. A magnetically adjustable motor with axially movable stator permanent magnets according to claim 2, characterized in that: The end ring (501) is circular, and the circular cross section is connected to the end of the permanent magnet steel (2).

4. A magnetically adjustable motor with axially movable stator permanent magnets according to claim 3, characterized in that: The permanent magnet steel (2) is segmented along the axial direction.

5. A magnetically adjustable motor with axially movable stator permanent magnets according to any one of claims 1 to 4, characterized in that: The salient pole rotor (1) is located inside the stator.

6. A magnetically adjustable motor with axially movable stator permanent magnets according to any one of claims 1 to 4, characterized in that: The salient pole rotor (1) is located outside the stator.

7. A magnetically adjustable motor with axially movable stator permanent magnets according to claim 1, characterized in that: The stator comprises an armature winding (3) and a stator core (4), and the number of pole pairs of the armature winding (3) is equal to the number of salient poles of the salient pole rotor (1) minus the number of pole pairs of the permanent magnet steel (2).

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