CN221101013U

CN221101013U - Device and system for testing influence of interference fit on performance of yoke part of stator core

Info

Publication number: CN221101013U
Application number: CN202322650177.3U
Authority: CN
Inventors: 王楠; 王亚男
Original assignee: Shenyang Kemei Intelligent Technology Co ltd
Current assignee: Shenyang Kemei Intelligent Technology Co ltd
Priority date: 2023-09-28
Filing date: 2023-09-28
Publication date: 2024-06-07
Anticipated expiration: 2033-09-28

Abstract

The utility model provides a device and a system for testing influence of interference fit on performance of a stator core yoke, belongs to the technical field of electromechanics, and is used for solving the problem that the influence of interference fit on the performance of the stator core yoke is difficult. The device for testing the influence of interference fit on the performance of the yoke part of the stator core comprises: the device comprises a clamp, a pair of excitation inner cores, a pair of excitation coils and a test coil. The clamp comprises a fixed ring and an adjusting assembly. The pair of excitation inner cores are symmetrically arranged in the stator core. A pair of exciting coils are respectively wound on a pair of exciting inner cores and are mutually connected in series. The test coil is wound on an excitation core. The device reduces the testing difficulty and improves the accuracy of the testing result.

Description

Device and system for testing influence of interference fit on performance of yoke part of stator core

Technical Field

The utility model belongs to the technical field of motors, and particularly relates to a device and a system for testing the influence of interference fit on the performance of a yoke part of a stator core.

Background

The electrical losses of the motor itself account for a significant portion of the electrical energy consumption, and therefore it is important to analyze the electrical losses of the motor in order to increase the efficiency of the motor. One of the important reasons for the increase of the electrical loss is that the stator core is affected by residual stress, which is stress generated during the manufacturing process of the stator core, such as punching, lamination, annealing, interference fit, etc., which stresses the inside of the stator core. The interference fit can introduce a pressing force into the stator core yoke part, so that the material property of the stator core yoke part is changed, the magnetic induction intensity of the stator core is reduced, the iron loss is increased, and the efficiency of the motor is reduced. Currently, the test work of the stator core affected by the interference fit is only analyzed by the toroidal method of winding the coil around the yoke of the stator core. For stator cores with embedded windings and a much longer housing length than the core length, conventional toroidal testing is difficult.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art or related art.

In a first aspect, the present utility model provides an apparatus for testing the effect of an interference fit on the performance of a stator core yoke, comprising: the device comprises a clamp, a pair of excitation inner cores, a pair of excitation coils and a test coil. The clamp comprises a fixed ring and an adjusting assembly. The fixing ring is provided with an opening. The adjusting component is arranged on the opening. The fixed ring is used for sleeving the periphery of the stator core. The adjusting component can adjust the size of the opening, and then the pressing force of the fixed ring to the stator core is changed. The pair of excitation inner cores are symmetrically arranged in the stator core, and a gap is reserved between the pair of excitation inner cores. The two ends of each excitation inner core are respectively abutted against the tooth parts of the stator core. A pair of exciting coils are wound on the pair of exciting cores, respectively. A pair of exciting coils are connected in series with each other. The test coil is wound on an excitation core.

Optionally, the fixing ring includes: the first arc-shaped plate, the second arc-shaped plate and the connecting piece. The first arcuate plate includes a first end and a second end along the arcuate direction. The second arc plate comprises a third end and a fourth end along the radian direction. The connecting piece is connected between the first end of the first arc-shaped plate and the third end of the second arc-shaped plate. An opening is formed between the second end of the first arc-shaped plate and the fourth end of the second arc-shaped plate. The adjusting component is connected between the second end of the first arc-shaped plate and the fourth end of the second arc-shaped plate, and the distance between the second end and the fourth end can be changed.

Optionally, the connector comprises a first connector plate, a second connector plate and a hinge structure. The first connecting plate and the second connecting plate are arc-shaped. The first connecting plate and the second connecting plate are connected with each other through a hinge structure. One end of the first connecting plate far away from the second connecting plate is connected to the first end of the first arc-shaped plate. One end of the second connecting plate far away from the first connecting plate is connected to the third end of the second arc-shaped plate.

Optionally, the hinge structure comprises: the first connecting portion, the second connecting portion and the connecting rod. The first connecting portion is located on a radially outer side of the first connecting plate. The first connecting part is provided with a first connecting hole. The axis of the first connecting hole is parallel to the axis of the first connecting plate. The second connecting portion is located on a radially outer side of the second connecting plate. The second connecting part is provided with a second connecting hole. The axis of the second connecting hole is parallel to the axis of the second connecting plate. The connecting rod penetrates through the first connecting hole and the second connecting hole in sequence.

Optionally, the adjustment assembly comprises: the device comprises a first adjusting plate, a second adjusting plate, an adjusting bolt and an adjusting nut. The first adjusting plate includes a first straight section and a first arcuate section that are connected to each other. An included angle is formed between the first straight section and the first arc section. One end of the first arc section, which is far away from the first straight section, is connected to one side of the opening. The second adjusting plate comprises a second straight section and a second arc section which are connected with each other. An included angle is formed between the second straight section and the second arc section. One end of the second arc section, which is far away from the second straight section, is connected to the other side of the opening. The second straight section corresponds to the first straight section. The adjusting bolt includes a head portion and a stem portion. The rod portion penetrates the first straight section and the second straight section. The head is located at one end of the stem. The adjusting nut is arranged on the rod part of the adjusting bolt. The first straight section and the second straight section are located between the adjustment nut and the head.

Optionally, the excitation core includes a first plate, a second plate, and a third plate connected in sequence. The first plate and the third plate are bent toward the same side of the second plate. The excitation coil and/or the test coil are arranged on the second plate.

Optionally, the second plates of a pair of exciter cores are parallel to each other. The included angle between the first plates of the pair of excitation cores is 90 °. The angle between the third plates of the pair of excitation cores is 90 °.

Alternatively, the exciting core penetrates the stator core in the axial direction of the stator core. The thickness of the exciting core is the same as the tooth thickness of the stator core.

In a second aspect, the present utility model also provides a system for testing the effect of an interference fit on the performance of a stator core yoke, comprising: the device for testing the influence of interference fit on the performance of the yoke part of the stator core, the control module, the conversion module, the first measurement module and the second measurement module. The device for testing the influence of the interference fit on the performance of the yoke part of the stator core is used for applying a pressing force to the stator core so as to simulate the interference fit. The control module is used for outputting an excitation signal. The conversion module is connected between the control module and the exciting coil. The conversion module is used for converting the excitation signal into excitation voltage and applying the excitation voltage to the excitation coil. The first measuring module is connected to the exciting coil. The first measurement module is used for acquiring exciting current in the exciting coil. The second measurement module is connected to the test coil. The second measurement module is used for acquiring the induced voltage in the test coil. The control module is connected with the first measuring module and the second measuring module, and obtains the iron loss of the stator core according to exciting current and induced voltage.

Optionally, the excitation signal conversion module includes: D/A converter and power amplifier. The signal input end of the D/A converter is connected with the control module. The output end of the D/A converter is connected with the exciting coil through a power amplifier. The first measurement module includes: a resistor and a first preamplifier. The resistor is connected in parallel with the power amplifier. The input end of the first preamplifier is connected to the resistor. The output end of the first preamplifier is connected with the control module through the A/D converter. The second measurement module includes a second preamplifier. The input end of the second preamplifier is connected to the test coil. The output end of the second preamplifier is connected with the control module through the A/D converter.

Advantageous effects

1. The device for testing the influence of interference fit on the performance of the yoke part of the stator core provided by the embodiment of the utility model comprises a clamp, a pair of exciting inner cores, a pair of exciting coils and a test coil. In a test for testing the influence of interference fit on the performance of a yoke part of a stator core, firstly, placing the stator core in a clamp, and applying a pressing force to the stator core by using the clamp to simulate the interference fit; and symmetrically placing a pair of exciting inner cores into the stator core to be tested, and installing exciting coils and test coils on the pair of exciting inner cores. At this time, the installation of the stator core to be tested is completed, and as long as the exciting coil is electrified, induced current is generated in the test coil, so that the iron loss of the stator core can be obtained. The device is used for testing the influence of interference fit on the performance of the yoke part of the stator core, so that the defects that the magnetic field strength H is difficult to accurately measure and the magnetic flux density B can be accurately measured only under the condition of being uniformly distributed along an effective magnetic circuit due to the complex shape of the stator core in an annular method can be overcome, and the effective magnetic circuit is simplified. And even in the complex-shaped iron core and under the condition that the magnetic flux density is unevenly distributed along the effective magnetic circuit, the influence of the interference fit process on the magnetic performance and the loss performance of the yoke part of the stator iron core can be well tested. In addition, the fixture comprises a fixed ring adjustable component, an opening is formed in the fixed ring, the adjusting component is arranged on the opening, the size of the opening is changed through the adjusting component, various interference values can be flexibly simulated under the condition that the stator core is not damaged, the change rule of magnetization performance and loss performance can be conveniently obtained, and the fixture and the excitation inner core can be repeatedly used. The exciting coil and the test coil are wound on the exciting inner core, so that the coil is prevented from being wound on the stator core, the length of the shell of which is far longer than that of the core, and the influence rule of interference fit on the core after the embedded winding is conveniently analyzed.

2. The system for testing the influence of the interference fit on the performance of the stator core yoke provided by the embodiment of the utility model comprises the device for testing the influence of the interference fit on the performance of the stator core yoke, the control module, the conversion module, the first measurement module and the second measurement module, and the device for testing the influence of the interference fit on the performance of the stator core yoke is used for applying a pressing force on the stator core so as to simulate the interference fit, so that the system has all the beneficial effects and is not repeated herein. The system for testing the influence of interference fit on the performance of the yoke part of the stator core provided by the embodiment utilizes the excitation signal output by the control module, and converts the excitation signal into excitation voltage through the conversion module and applies the excitation voltage to the excitation coil wound on the excitation core. And the exciting magnetic flux density (Bex) is controlled to be sine wave by feedback control of the exciting voltage waveform. The excitation current is measured using a first measurement module. And measuring the induced voltage by using a second measuring module, and calculating the magnetization performance and the iron loss by using the induced voltage, the magnetic field strength and the exciting current. The system can measure the magnetization and loss performance of the stator core yoke affected by interference fit, can obtain the influence rule of different interference amounts on the magnetization and loss performance of the motor stator core yoke, and provides a basis for analyzing the magnetic performance of the stator core and selecting proper interference amounts.

Drawings

FIG. 1 is a schematic diagram of an apparatus for testing the effect of an interference fit on the performance of a stator core yoke according to one embodiment of the present utility model;

FIG. 2 is a schematic view of a structure of a clamp according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a first arcuate plate according to an embodiment of the present utility model;

FIG. 4 is a schematic structural view of a connector according to an embodiment of the present utility model;

fig. 5 is a schematic structural view of a connecting rod according to an embodiment of the present utility model.

Fig. 6 is a schematic structural view of an adjusting assembly according to an embodiment of the present utility model.

Fig. 7 is a schematic structural view of an exciting core according to an embodiment of the present utility model.

Fig. 8 is a schematic diagram of a system for testing the effect of an interference fit on the performance of a stator core yoke in accordance with one embodiment of the present utility model.

The reference numerals are expressed as:

0. a stator core; 1. a clamp; 2. an excitation core; 3. an exciting coil; 4. a test coil;

01. a tooth portion;

11. a fixing ring; 12. an adjustment assembly; 13. a connecting piece;

111. a first arcuate plate; 112. a second arcuate plate;

111a, a first end; 111b, a second end;

121. A first adjustment plate; 122. a second adjusting plate; 123. an adjusting bolt; 124. an adjusting nut;

1211. a first straight section; 1212. A first arc segment;

1221. a second straight section; 1222. A second arc segment;

1231. A head; 1232. A stem portion;

131. A first connection plate; 132. A second connecting plate; 133. A hinge structure;

1331. a first connection portion; 1332. A second connecting portion; 1333. A connecting rod;

21. a first plate; 22. a second plate; 23. a third plate;

5. A control module; 6. a conversion module; 7. a first measurement module; 8. a second measurement module; 9. an A/D converter;

61. a D/A converter; 62. a power amplifier;

71. A resistor; 72. a first preamplifier;

81. A second preamplifier.

Detailed Description

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.

In a first aspect, the present embodiments provide an apparatus for testing the effect of an interference fit on the performance of a stator core yoke. Fig. 1 is a schematic structural diagram of an apparatus for testing the influence of interference fit on the performance of a yoke of a stator core according to the present embodiment

As shown in fig. 1, the device for testing the influence of interference fit on the performance of the yoke portion of the stator core according to the present embodiment includes: the device comprises a clamp 1, a pair of exciting cores 2, a pair of exciting coils 3 and a test coil 4. The clamp 1 comprises a fixing ring 11 and an adjusting assembly 12. The fixing ring 11 is provided with an opening. An adjustment assembly 12 is disposed over the opening. The fixing ring 11 is used to be sleeved on the outer periphery of the stator core 0. The adjusting component 12 can adjust the size of the opening, and then the pressing force of the fixing ring 11 to the stator core 0 is changed. The pair of exciting cores 2 are symmetrically disposed inside the stator core 0, with a gap between the pair of exciting cores 2. Both ends of each exciting core 2 are respectively abutted against the teeth 01 of the stator core 0. A pair of exciting coils 3 are wound around the pair of exciting cores 2, respectively. The pair of exciting coils 3 are connected in series with each other. The test coil 4 is wound around one excitation core 2.

In some examples, as shown in fig. 1, the clamp 1 is fabricated from a non-magnetically permeable material. By this arrangement, the eddy current loss generated in the jig 1 can be avoided, and the measurement accuracy can be improved.

In some examples, as shown in fig. 1, the exciting core 2 and the stator core 0 to be measured are the same in material and process. This arrangement is advantageous in that the excitation core 2 and the measured sub-core 0 have a uniform magnetic flux density around them.

By way of example, referring to fig. 1, the exciting coil 3 has a total number of turns of 100 turns, a wire having a diameter of 0.8mm is used as the exciting coil 3, and the exciting coils 3 wound on the two exciting cores 2 are connected in series to eliminate leakage magnetic flux; a wire having a diameter of 0.2mm was used as the test coil 4, and a number of turns of 3 turns was wound around one of the exciting cores 2.

For example, referring to fig. 1, the fixing ring 11 is provided with an opening of 4mm. It will be appreciated that in other embodiments, the appropriate opening width may be selected by itself as required for testing, with the purpose of opening size adjustment to simulate different levels of interference by opening size adjustment of the inner circumference of the clamp 1.

The device for testing the influence of interference fit on the performance of the yoke part of the stator core provided in the embodiment comprises a clamp 1, a pair of exciting inner cores 2, a pair of exciting coils 3 and a test coil 4. In a test for testing the influence of interference fit on the performance of a yoke of a stator core, firstly, placing the stator core 0 in a clamp 1, and applying a pressing force to the stator core 0 by using the clamp 1 to simulate the interference fit; and a pair of exciting cores 2 are symmetrically placed in the stator core 0 to be tested, and an exciting coil 3 and a test coil 4 are arranged on the pair of exciting cores 2. At this time, the mounting of the stator core 0 to be tested is completed, and when the exciting coil 3 is energized, an induced current is generated in the test coil 4, and the core loss of the stator core 0 can be obtained. The device is used for testing the influence of interference fit on the performance of the yoke part of the stator core, so that the defects that the magnetic field strength H is difficult to accurately measure and the magnetic flux density B can be accurately measured only under the condition of being uniformly distributed along an effective magnetic circuit due to the complex shape of the stator core 0 in an annular method can be overcome, and the effective magnetic circuit is simplified.

And even in the complex-shaped iron core and under the condition that the magnetic flux density is unevenly distributed along the effective magnetic circuit, the influence of the interference fit process on the magnetic performance and the loss performance of the yoke part of the stator iron core can be well tested.

In addition, anchor clamps include solid fixed ring 11 and adjusting part 12, are equipped with the opening on the solid fixed ring 11, and adjusting part 12 sets up on the opening, changes the open-ended size through adjusting part 12, can simulate multiple interference magnitude in a flexible way under the condition that stator core 0 does not have the damage, is convenient for acquire magnetization performance and loss performance's change law, and anchor clamps 1 and excitation inner core 2 can repetitious usage. The exciting coil 3 and the test coil 4 are wound on the exciting inner core 2, so that the coil is prevented from being wound on the stator core 0 of which the casing length is far longer than the core length, and the influence rule of interference fit on the stator core 0 after the winding is embedded is conveniently analyzed.

In some embodiments, as shown in fig. 2, the securing ring 11 includes: a first arcuate plate 111, a second arcuate plate 112 and a connecting piece 13. As shown in fig. 3, the first arc plate 111 includes a first end 111a and a second end 111b in the arc direction. The second arcuate plate 112 includes third and fourth ends along the arc direction. The connecting piece 13 is connected between the first end 111a of the first arc-shaped plate 111 and the third end of the second arc-shaped plate 112. An opening is formed between the second end 111b of the first arcuate plate 111 and the fourth end of the second arcuate plate 112. The adjusting component 12 is connected between the second end 111b of the first arcuate plate 111 and the fourth end of the second arcuate plate 112, and can change the distance between the second end 111b and the fourth end.

In some examples, as shown in fig. 2, the first arcuate plate 111, the connecting member 13, the second arcuate plate 112, and the adjustment assembly 12 are interconnected by a dovetail groove. Thus, the fixing ring 11 can be easily assembled and disassembled.

In some examples, referring to fig. 2, the number of first arcuate plates 111 and second arcuate plates 112 may be multiple and have different diameters or arcuate lengths. So set up, be convenient for replace to enlarge application scope.

In some examples, as shown in fig. 3, a dovetail groove is provided on a first end 111a of the first arcuate plate 111 and a dovetail slider is provided on a second end 111 b. The second arc-shaped plate 112 has the same structure as the first arc-shaped plate 111, a dovetail groove is arranged on the third end, and a dovetail sliding block is arranged on the fourth end. As shown in fig. 2, dovetail sliding blocks are respectively arranged at two ends of the connecting piece 13 and are respectively connected with a dovetail groove at the first end 111a of the first arc-shaped plate 111 and a dovetail groove at the third end of the second arc-shaped plate 112 in a matching manner. Dovetail grooves are formed in two ends of the adjusting component 12, and the dovetail grooves are respectively matched and connected with a dovetail sliding block on the second end 111b of the first arc-shaped plate 111 and a dovetail sliding block on the fourth end of the second arc-shaped plate 112. So arranged, the disassembly of the connection of the fixing ring 11 is facilitated.

The fixing ring 11 of the present embodiment includes a first arc 111, a second arc 112 and a connecting member 13. The first arcuate plate 111 and the second arcuate plate 112 are connected by a connecting member 13 to form a cylinder having an opening, and can be used to house the stator core 0. The size of the opening is changed by utilizing the adjusting component 12, the pressing force of the fixed ring 11 to the stator core 0 can be changed, and then interference fit with different degrees can be simulated, so that the stator core is more flexible and convenient to use. In addition, the fixing ring 11 of the present embodiment adopts a sectional structure, which is convenient for adjusting its structure according to the test requirement and for processing.

In some embodiments, as shown in fig. 4, the connector 13 includes a first connector plate 131, a second connector plate 132, and a hinge structure 133. The first connection plate 131 and the second connection plate 132 are each arc-shaped. The first connection plate 131 and the second connection plate 132 are connected to each other by a hinge structure 133. One end of the first connection plate 131, which is far from the second connection plate 132, is connected to the first end 111a of the first arc plate 111. One end of the second connecting plate 132, which is far away from the first connecting plate 131, is connected to the third end of the second arc plate 112.

In some examples, as shown in fig. 4, the first and second connection plates 131 and 132 have the same arc length and radius. So arranged, the first arcuate plate 111 and the second arcuate plate 112 are conveniently installed.

The first connection plate 131 and the second connection plate 132 of the present embodiment are connected to each other by a hinge structure 133, and can be opened and closed, so that the present embodiment can be applied to stator cores 0 having different outer diameters.

In some embodiments, as shown in fig. 4, the hinge structure 133 includes: a first connection portion 1331, a second connection portion 1332, and a connection rod 1333. The first connection portion 1331 is located on the radially outer side of the first connection plate 131. The first connection portion 1331 is provided with a first connection hole. The axis of the first connection hole is parallel to the axis of the first connection plate 131. The second connection 1332 is located on the radially outer side of the second connection plate 132. The second connection portion 1332 is provided with a second connection hole. The axis of the second connection hole is parallel to the axis of the second connection plate 132. The connection rod 1333 sequentially penetrates the first connection hole and the second connection hole.

In some examples, as shown in fig. 4, the first connection hole on the first connection part 1331 is a threaded hole, and the second connection hole on the second connection part 1332 is an optical hole. As shown in fig. 5, the lower portion of the connecting rod 1333 is provided with threads. The lower portion of the connection rod 1333 passes through the second connection hole and is connected with the first connection hole through screw-fit. So set up, can guarantee the stability of hinge structure 133, can make second connecting portion 1332 can rotate around connecting rod 1333 again, and then realize the relative opening and shutting of first connecting plate 131 and second connecting plate 132.

In this embodiment, the first connecting portion 1331 is disposed on the radial outer side of the first connecting plate 131, the second connecting portion 1332 is disposed on the radial outer side of the second connecting plate 132, and the first connecting portion 1331 and the second connecting portion 1332 are hinged by the connecting rod 1333, so that the first connecting plate 131 and the second connecting plate 132 can be tightly attached when being closed, and a uniform pressing force can be applied to the stator core 0.

In some embodiments, as shown in fig. 6, the adjustment assembly 12 includes: a first adjustment plate 121, a second adjustment plate 122, an adjustment bolt 123, and an adjustment nut 124. The first adjustment plate 121 includes a first straight segment 1211 and a first arcuate segment 1212 that are interconnected. The first straight segment 1211 forms an included angle with the first arcuate segment 1212. One end of the first arc segment 1212 remote from the first straight segment 1211 is connected to one side of the opening. The second adjustment plate 122 includes a second straight segment 1221 and a second arcuate segment 1222 that are connected to each other. The second straight segment 1221 forms an angle with the second arcuate segment 1222. One end of the second arc 1222 remote from the second straight section 1221 is connected to the other side of the opening. The second straight segment 1221 corresponds to the first straight segment 1211. The adjustment bolt 123 includes a head portion 1231 and a stem portion 1232. The stem 1232 extends through the first straight section 1211 and the second straight section 1221. The head 1231 is located at one end of the stem 1232. An adjustment nut 124 is provided on the shank 1232 of the adjustment bolt 123. The first straight section 1211 and the second straight section 1221 are located between the adjustment nut 124 and the head 1232.

In some examples, as shown in fig. 6, the second straight section 1221 and the first straight section 1211 each extend radially outward of the retaining ring 11, and the second straight section 1221 and the first straight section 1211 are parallel to each other. This arrangement facilitates installation and adjustment of the adjustment bolt 123 and adjustment nut 124. It will be appreciated that in other embodiments, the second straight section 1221 and the first straight section 1211 may have an included angle therebetween, so long as the installation and adjustment of the adjustment bolt 123 and the adjustment nut 124 can be achieved, which is not limited in this embodiment.

In some examples, as shown in fig. 6, the first straight segment 1211 and the first arcuate segment 1212 are an integrally formed structure, and the second straight segment 1221 and the second arcuate segment 1222 are an integrally formed structure. By the arrangement, the structural strength of the adjusting assembly 12 is improved, and the service life of the adjusting assembly 12 is prolonged.

The adjustment assembly 12 of the present embodiment includes a first adjustment plate 121, a second adjustment plate 122, an adjustment bolt 123, and an adjustment nut 124. The first adjustment plate 121 includes a first straight segment 1211 and a first arcuate segment 1212 that are connected to each other, with an end of the first arcuate segment 1212 distal from the first straight segment 1211 being connected to the second end 111b of the first arcuate plate 111. The second adjusting plate 122 includes a second straight section 1221 and a second arc section 1222 connected to each other, and an end of the second arc section 1222 remote from the second straight section 1221 is connected to a fourth end of the second arc plate 112. The rod portion 1232 of the adjusting bolt 123 penetrates the first straight section 1211 and the second straight section 1221, and by rotating the adjusting nut 124, the opening between the second end 111b of the first arcuate plate 111 and the fourth end of the second arcuate plate 112 can be reduced by causing the adjusting nut 124 to move toward the head portion 1231 of the adjusting bolt 123. The counter-rotation of the adjusting nut 124 can gradually increase the distance between the second end 111b of the first arcuate plate 111 and the fourth end of the second arcuate plate 112 under the supporting action of the stator core 0. And further can simulate interference fits of varying degrees.

In some embodiments, as shown in fig. 7, the field core 2 includes a first plate 21, a second plate 22, and a third plate 23 connected in this order. The first plate 21 and the third plate 23 are bent toward the same side as the second plate 22. The excitation coil 3 and/or the test coil 4 are arranged on the second plate 22.

In some examples, as shown in fig. 7, the first plate 21, the second plate 22, and the third plate 23 are an integrally formed structure. The arrangement is convenient for processing and manufacturing, and is beneficial to reducing the number of parts and production steps.

In some examples, as shown in fig. 7, only the exciting coil 3 is provided on one exciting core 2, and the exciting coil 3 and the test coil 4 are provided on the other exciting core 2 at intervals. It should be noted that the exciting coils 3 on the two exciting cores 2 are connected in series with each other. This arrangement enables a magnetic field to be generated around the excitation core 2 and an induced current to be generated in the test coil 4.

The field core 2 of the present embodiment includes a first plate 21, a second plate 22, and a third plate 23 connected in this order. The first plate 21 and the third plate 23 are bent toward the same side as the second plate 22 so that two exciting cores 2 can be accommodated in the stator core 0 and both ends of each exciting core 2 can be brought into contact with the teeth 01 of the stator core 0.

In some embodiments, as shown in fig. 1 and 7, the second plates 22 of a pair of field cores 2 are parallel to each other. The angle between the first plates 21 of the pair of exciting cores 2 is 90 °. The angle between the third plates 23 of the pair of excitation cores 2 is 90 °.

The angle between the first plates 21 of the pair of exciting cores 2 of the present embodiment is 90 °. The angle between the third plates 23 of the pair of exciting cores 2 is 90 deg., even though the first plates 21 and the third plates 23 are uniformly distributed at 90 deg. intervals in the stator core 0, which is advantageous in obtaining uniform magnetic flux density.

In some embodiments, as shown in fig. 1 and 7, the field core 2 penetrates the stator core 0 in the axial direction of the stator core 0. The thickness of the exciting core 2 is the same as the thickness of the tooth 01 of the stator core 0.

The exciting core 2 of the present embodiment penetrates the stator core 0 in the axial direction of the stator core 0, and can make the entire stator core 0 in the exciting magnetic field to obtain a uniform magnetic field strength. The thickness of the exciting core 2 is the same as the thickness of the tooth 01 of the stator core 0, and the exciting core and the tooth 01 can be tightly connected to obtain uniform magnetic flux density.

Since the interference fit is to introduce a pressing force to the yoke portion of the stator core 0, deterioration of the loss performance of the stator core 0 occurs, and the influence on the tooth portion 01 of the stator core 0 is so small as to be completely negligible. Therefore, it is considered that the increase in the loss of the stator core 0 and the decrease in the magnetic induction intensity due to the interference fit are caused by the influence of the residual stress in the interference fit of the yoke portion of the stator core 0. In the embodiment, during testing, the exciting core 2 wound with the exciting coil 3 and the testing coil 4 can be directly placed inside the stator core 0 to be tested, the coil is not required to be wound on the yoke part of the stator core 0 like a conventional method, and the influence rule of interference fit on the magnetization performance and the loss performance of the stator core 0 with the length of the shell far longer than that of the core after the winding is embedded can be tested, so that the operation is simple and convenient, and the application range is wide.

In a second aspect, the present embodiments also provide a system for testing the effect of an interference fit on the performance of a stator core yoke. Fig. 8 is a schematic diagram of a system for testing the effect of an interference fit on the performance of a stator core yoke according to the present embodiment.

As shown in fig. 8, the system for testing the influence of interference fit on the performance of the yoke portion of the stator core according to the present embodiment includes: the device for testing the influence of interference fit on the performance of the yoke of the stator core, the control module 5, the conversion module 6, the first measurement module 7 and the second measurement module 8 in the above embodiment. The device for testing the influence of the interference fit on the performance of the yoke of the stator core is used for applying a pressing force to the stator core 0 so as to simulate the interference fit. The control module 5 is used for outputting an excitation signal. The conversion module 6 is connected between the control module 5 and the exciting coil 3. The conversion module 6 is used for converting the exciting signal into exciting voltage and applying the exciting voltage to the exciting coil 3. The first measuring module 7 is connected to the exciting coil 3. The first measurement module 7 is used for acquiring the exciting current in the exciting coil 3. The second measurement module 8 is connected to the test coil 4. The second measurement module 8 is used to obtain the induced voltage in the test coil 4. The control module 5 is connected to the first measuring module 7 and the second measuring module 8, and obtains the core loss of the stator core 0 according to the exciting current and the induced voltage.

In some examples, as shown in fig. 8, the control module 5 includes a computer. The computer is adopted as the control module 5, so that the use is convenient.

The system for testing the influence of the interference fit on the performance of the yoke of the stator core provided in this embodiment includes the device for testing the influence of the interference fit on the performance of the yoke of the stator core, the control module 5, the conversion module 6, the first measurement module 7 and the second measurement module 8 in the above embodiment, and the device for testing the influence of the interference fit on the performance of the yoke of the stator core 0 in the above embodiment is used for applying a pressing force on the stator core 0 to simulate the interference fit, so that all the beneficial effects described above are provided, and the description is omitted herein.

The system for testing the influence of interference fit on the performance of the yoke part of the stator core provided by the embodiment utilizes the excitation signal output by the control module 5, and converts the excitation signal into excitation voltage through the conversion module 6 and applies the excitation voltage to the excitation coil 3 wound on the excitation core 2. And the exciting magnetic flux density (Bex) is controlled to be sine wave by feedback control of the exciting voltage waveform. The excitation current is measured with the first measuring module 7. The induced voltage is measured by the second measurement module 8 and the magnetization properties and core losses are calculated by the induced voltage, the magnetic field strength and the excitation current. The system can measure the magnetization and loss performance of the yoke part of the stator core 0 affected by interference fit, can obtain the influence rule of different interference values on the magnetization and loss performance of the yoke part of the stator core 0 of the motor, and provides a basis for analyzing the magnetic performance of the stator core 0 and selecting proper interference values.

In some embodiments, as shown in fig. 8, the conversion module 6 includes: a D/a converter 61 and a power amplifier 62. The signal input of the D/a converter 61 is connected to the control module 5. The output of the D/a converter 61 is connected to the exciting coil 3 through a power amplifier 62. The first measurement module 7 comprises: a resistor 71 and a first preamplifier 72. Resistor 71 is connected in parallel with power amplifier 62. The input of the first preamplifier 72 is connected to a resistor 71. The output of the first preamplifier 72 is connected to the control module 5 via an a/D converter 9. The second measurement module 8 comprises a second preamplifier 81. The input of the second preamplifier 81 is connected to the test coil 4. The output of the second preamplifier 81 is connected to the control module 5 via an a/D converter 9.

In some examples, as shown in fig. 8, the output of the first preamplifier 72 and the output of the second preamplifier 81 are connected to the control module 5 via the same a/D converter 9. By the arrangement, the cost can be saved, and the circuit is simplified.

The conversion module 6 of the present embodiment includes a D/a converter 61 and a power amplifier 62, the D/a converter 61 being capable of converting a digital signal into a voltage signal, the power amplifier 62 being capable of amplifying the voltage signal to realize power supply to the exciting coil 3. The first measuring module 7 comprises a resistor 71 and a first preamplifier 72, the resistor 71 being connected in parallel with the signal amplifier 62 and therefore having the same voltage, and being connected in series with the excitation coil 3 and therefore having the same internal current. The exciting current in the exciting coil 3 can be obtained only by obtaining the current in the resistor 71.

The system of the present embodiment can control the exciting voltage outputted from the D/a converter 61 by the control module 5 to be applied to the exciting coil 3 wound around the exciting core 2 after being amplified by the power amplifier 62. And the exciting magnetic flux density (Bex) is controlled to be sine wave by feedback control of the exciting voltage waveform. The exciting current is measured by the voltage generated by the resistor 71. The magnetization properties and core losses are calculated using the output voltage of the test coil 4, the magnetic field strength and the measured excitation current.

The system provided by the embodiment is convenient and flexible to install, simple in experimental operation, capable of analyzing the change of the magnetization performance and the loss performance of the stator core 0 yoke when being influenced by interference fit, and capable of researching the change rule of the magnetization performance and the loss performance of the stator core 0 yoke when different interference values.

The embodiment also provides a method for testing the influence of interference fit on the performance of the yoke part of the stator core, and the method is used for the system. The method specifically comprises the following steps:

1) Establishing the system: embedding the stator core 0 into the clamp 1 to simulate the influence of the interference fit process on the magnetic performance of the yoke part of the stator core 0; after the exciting coil 3 and the test coil 4 are wound on the exciting cores 2, the exciting cores 2 are placed in the stator core 0, and both ends of each exciting core 2 are required to be closely attached to the tooth 01 to eliminate an air gap between the exciting core 2 and the tooth 01. The control module 5, the D/a converter 61, the power amplifier 62, the exciting coil 3, the resistor 71, the first pre-power amplifier 72, the a/D converter 9 and the control module 5, which function as control, are connected in this order. The test coil 4, the second preamplifier 81, the a/D converter 9 and the control module 5 are connected in sequence. And opening a main power switch, and accessing the power grid.

2) The control module 5 controls the exciting voltage outputted from the D/a converter 61 to be amplified by the power amplifier 62 and then applied to the exciting coil 3 wound around the exciting core 2.

3) The first preamplifier 72 connected to the resistor 71 measures the exciting current by using the voltage generated by the parallel resistor 71, and calculates the magnetic field strength H _ex (unit: a/m).

Wherein, N _e is the number of turns of the exciting coil, I _e is the exciting current, and L _e is the effective magnetic path length.

4) The second preamplifier 81 connected to the test coil 4 is responsible for measuring the induced voltage of the test coil 4, and the magnetic flux density B _ex (unit: t). And the exciting magnetic flux density (B _ex) is controlled to be sine wave by feeding back and controlling the exciting voltage waveform.

Wherein, N _s is the number of turns of the test coil, S _s is the sectional area of the exciting core, and v _s is the induced voltage.

5) The B-H curve can be obtained by using the magnetic field strength H _ex and the magnetic flux density B _ex calculated by the formulas (1) and (2), and the core loss (W _i) of the stator core 0 can be calculated by using the formula (3).

Where ρ (unit: kg/m 3) is the density of the material of the stator core, and T (unit: S) is the period of the exciting current.

The control module 5 can be used for controlling and generating voltage waveforms with various frequencies, adjusting the amplitude of exciting voltage, and repeating the steps 1) to 5), so that B-H curves and specific loss curves of iron cores with different magnetic flux densities and different frequencies can be obtained.

The device and the system provided by the embodiment can calculate the inner diameter and the inner circumference of the clamp 1 simulating interference fit according to the interference magnitudes of different sizes and the outer diameter of the measured sub-iron core 0, and adjust the size of the opening by adjusting the locking degree of the bolt 123 and the nut 124, thereby achieving the inner circumference of the clamp corresponding to the interference magnitude. And after the opening sizes corresponding to the interference sizes are adjusted, repeating the steps 1) to 5), so that the magnetization performance data and the loss data of the stator core 0 corresponding to the different interference sizes can be obtained.

In addition, based on the data of the stator core 0 in the interference-free state, the loss increment and the magnetic induction intensity reduction value of the yoke portion of the stator core 0 at different interference values can be calculated.

It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model. The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims

1. An apparatus for testing the effect of an interference fit on the performance of a stator core yoke, comprising:

The clamp comprises a fixed ring and an adjusting component; the fixing ring is provided with an opening; the adjusting component is arranged on the opening; the fixed ring is used for being sleeved on the periphery of the stator core; the adjusting component can adjust the size of the opening so as to change the pressing force of the fixing ring on the stator core;

A pair of exciting cores symmetrically arranged inside the stator core, a gap being provided between the pair of exciting cores; two ends of each excitation inner core are respectively abutted against tooth parts of the stator core;

A pair of exciting coils wound around the pair of exciting cores, respectively; the pair of exciting coils are connected in series;

and the test coil is wound on one exciting inner core.

2. The apparatus for testing the effect of an interference fit on the performance of a stator core yoke as recited in claim 1, wherein the retaining ring comprises:

The first arc-shaped plate comprises a first end and a second end along the radian direction;

The second arc-shaped plate comprises a third end and a fourth end along the radian direction;

The connecting piece is connected between the first end of the first arc-shaped plate and the third end of the second arc-shaped plate; forming the opening between the second end of the first arc-shaped plate and the fourth end of the second arc-shaped plate;

The adjusting component is connected between the second end of the first arc-shaped plate and the fourth end of the second arc-shaped plate, and the distance between the second end and the fourth end can be changed.

3. The apparatus for testing the effect of an interference fit on the performance of a stator core yoke of claim 2 wherein the connector includes a first connector plate, a second connector plate, and a hinge structure;

The first connecting plate and the second connecting plate are arc-shaped; the first connecting plate and the second connecting plate are connected with each other through the hinge structure;

One end of the first connecting plate, which is far away from the second connecting plate, is connected with the first end of the first arc-shaped plate;

one end of the second connecting plate, which is far away from the first connecting plate, is connected with the third end of the second arc-shaped plate.

4. The apparatus for testing the effect of an interference fit on the performance of a stator core yoke of claim 3, wherein the hinge structure comprises:

A first connection portion located on a radially outer side of the first connection plate; the first connecting part is provided with a first connecting hole; the axis of the first connecting hole is parallel to the axis of the first connecting plate;

A second connecting portion located on a radially outer side of the second connecting plate; the second connecting part is provided with a second connecting hole; the axis of the second connecting hole is parallel to the axis of the second connecting plate;

The connecting rod penetrates through the first connecting hole and the second connecting hole in sequence.

5. The apparatus for testing the effect of an interference fit on the performance of a stator core yoke as recited in any one of claims 1-4, wherein the adjustment assembly comprises:

The first adjusting plate comprises a first straight section and a first arc section which are connected with each other; an included angle is formed between the first straight section and the first arc section; one end of the first arc section, which is far away from the first straight section, is connected to one side of the opening;

The second adjusting plate comprises a second straight section and a second arc section which are connected with each other; an included angle is formed between the second straight section and the second arc section; one end of the second arc section, which is far away from the second straight section, is connected to the other side of the opening; the second straight section corresponds to the first straight section;

An adjusting bolt comprising a head portion and a stem portion; the rod part penetrates through the first straight section and the second straight section; the head is positioned at one end of the rod;

the adjusting nut is arranged on the rod part of the adjusting bolt; the first straight section and the second straight section are located between the adjustment nut and the head.

6. The apparatus for testing the effect of an interference fit on the performance of a stator core yoke of claim 1, wherein the field core includes a first plate, a second plate, and a third plate connected in sequence; the first plate and the third plate are bent towards the same side of the second plate; the excitation coil and/or the test coil is disposed on the second plate.

7. The apparatus for testing the effect of an interference fit on the performance of a stator core yoke of claim 6 wherein the second plates of the pair of field cores are parallel to each other; an included angle between the first plates of the pair of exciting cores is 90 degrees; the included angle between the third plates of the pair of exciting cores is 90 °.

8. The apparatus for testing the effect of an interference fit on the performance of a stator core yoke as recited in any one of claims 1, 6, 7, wherein the field core penetrates the stator core in the axial direction of the stator core; the thickness of the exciting inner core is the same as the tooth thickness of the stator core.

9. A system for testing the effect of an interference fit on the performance of a stator core yoke, comprising:

A device for testing the effect of an interference fit on the performance of a stator core yoke as claimed in any one of claims 1 to 8, said device being adapted to apply a compressive force to said stator core to simulate an interference fit;

the control module is used for outputting an excitation signal;

the conversion module is connected between the control module and the exciting coil; the conversion module is used for converting the excitation signal into excitation voltage and applying the excitation voltage to the excitation coil;

the first measuring module is connected with the exciting coil; the first measurement module is used for acquiring exciting current in the exciting coil;

The second measuring module is connected with the test coil; the second measurement module is used for acquiring the induced voltage in the test coil;

The control module is connected with the first measuring module and the second measuring module, and obtains the iron loss of the stator core according to the exciting current and the induced voltage.

10. The system for testing the effect of an interference fit on the performance of a stator core yoke of claim 9, wherein the conversion module comprises: a D/A converter and a power amplifier; the signal input end of the D/A converter is connected with the control module; the output end of the D/A converter is connected with the exciting coil through the power amplifier;

The first measurement module includes: a resistor and a first preamplifier; the resistor is connected with the power amplifier in parallel; the input end of the first preamplifier is connected to the resistor; the output end of the first preamplifier is connected with the control module through an A/D converter;

The second measurement module comprises a second preamplifier; the input end of the second preamplifier is connected with the test coil; the output end of the second preamplifier is connected with the control module through an A/D converter.