Motor air gap length test method and test system, motor performance test method

Abstract

The present invention discloses a motor air gap length test method and test system, and a motor performance test method, the technical key points of which are: Step 1, obtaining the distance-magnetic induction intensity data set of the rotor main shaft magnetic shoe of the motor to be tested; Step 2, fitting n data points (h1, b1), (h2, b2), ..., (hn, bn) in a linear manner; Step 3, after the motor rotor-stator assembly is completed, using a Gauss meter to measure the magnetic induction intensity at different points on the stator surface in the circumferential direction; Step 4, solving the actual air gap length δ1 of the motor. The technical solution of the present application is used to facilitate the detection of motor performance.

Description

Technical Field

[0001] The present invention relates to the field of testing, and more specifically, to a motor air gap length testing method and testing system, and a motor performance testing method. Background Art

[0002] The motor is one of the most critical components in the magnetic levitation molecular pump, and the quality of its performance parameters has a great influence on the working stability of the magnetic levitation pump.

[0003] like Figure 1 As shown, four magnetic tiles 101 and four spacers 102 are arranged around the main shaft of the motor rotor: adjacent magnetic tiles 101 are separated by spacers 102. Figure 2 As shown, a carbon cylinder 103 is arranged on the outside of the four magnetic tiles 101 and the four spacers 102 .

[0004] In the development and design of motors, the incoming inspection of magnetic tiles and the bonding process between magnetic tiles and rotor core will seriously affect the performance of the motor. Specifically, there are two main impacts:

[0005] (1) The incoming magnetic tile material is not standard or the thickness of the magnetic tile adhesive glue is uneven. The above situations will cause the motor air gap length to deviate from the theoretical design length, which will lead to uneven magnetic field distribution of the motor rotor. The magnetic field strength in some areas may increase or decrease. This uneven magnetic field distribution will directly affect the performance of the motor, which may cause the motor to vibrate and increase noise or even cause the pump to drop.

[0006] (2) When the motor rotates at high speed, the centrifugal force may cause the magnetic tile to be thrown out or slightly displaced, thereby affecting the dynamic balance of the rotor and the overall performance of the motor. In order to avoid the above problems, it is necessary to set a carbon cylinder 103 to ensure the stability and safety of the rotor under high-speed rotation. The inner and outer surfaces of the motor rotor have a certain arc, and the magnetic tile should also be made into a corresponding arc to ensure a close fit. The existence of the carbon cylinder 103 and the arc shape of the magnetic tile will affect the air gap length of the motor.

[0007] In summary, since the thickness of the adhesive layer of the magnetic bearing of the magnetic bearing of the magnetic bearing motor rotor cannot be accurately controlled, and the magnetic bearing has strong magnetism and the inner and outer diameters of the magnetic bearing cannot be directly and accurately measured after the carbon cylinder is installed on the outer side of the magnetic bearing, the actual air gap length of the motor (the air gap length is defined as the distance between the outer surface of the rotor main shaft magnetic bearing and the inner surface of the stator) deviates from the ideal design air gap. The above deviation will cause the bus voltage of the magnetic bearing pump to exceed the design standard range, resulting in unqualified phenomena such as pump drop.

[0008] Therefore, it is necessary to build a test system specifically for the motor to conduct a preliminary assessment of the air gap length of the motor, screen out defective products in a timely manner, and prevent the rotor motor from flowing to the downstream process, thereby improving the process inspection efficiency of the magnetic levitation molecular pump and improving the stability and pass rate of magnetic levitation pump production. However, the existing equipment cannot directly measure the actual air gap length of the magnetic levitation pump motor.

[0009] Therefore, it is necessary to develop a special equipment to conduct a preliminary evaluation of the actual air gap length of the magnetic levitation pump motor. Summary of the invention

[0010] The purpose of the present invention is to provide a motor air gap length testing system in view of the above-mentioned deficiencies in the prior art.

[0011] Another object of the present invention is to provide a method for testing the air gap length of a motor.

[0012] Another object of the present invention is to provide a method for detecting motor performance.

[0013] A method for testing the air gap length of a motor comprises the following steps:

[0014] Step 1, obtain the distance-magnetic induction intensity data set of the rotor main shaft magnetic shoe of the motor to be tested: (h1, b1), (h2, b2), ..., (hi, bi), ..., (hn, hn);

[0015] Among them, h1, h2, h3, ..., hi, ..., hn represent the length from the magnetic tile;

[0016] Among them, b1, b2, b3, ..., bi, ..., bn represent the representative values ​​of magnetic induction intensity corresponding to the distance from the magnetic tile being h1, h2, h3, ..., hi, ..., hn;

[0017] Step 2, express the n data points (h1, b1), (h2, b2), ..., (hn, bn) in a linear fitting manner as follows:

[0018] y=cx+d; c, d are fitting parameters;

[0019] Step 3, after the motor rotor-stator assembly is completed, use a Gauss meter to measure the magnetic induction intensity at different points on the stator surface in the circumferential direction: p1, p2, ..., pm;

[0020] Step 4, solve the actual air gap length δ1 of the motor;

[0021] δ1=[(p1-d) / c+(p2-d) / c+……+(pm-d) / c] / m=[(p1+ p2+……+pm) / md] / c.

[0022] Furthermore, there are four identical magnetic tiles on the rotor main shaft of the motor to be tested, which are called: a first magnetic tile, a second magnetic tile, a third magnetic tile, and a fourth magnetic tile;

[0023] Step 1 also includes the following sub-steps:

[0024] Step 1-1, measure the magnetic induction intensity at a distance of h1, h2, h3, ..., hi, ..., hn from the first magnetic tile, the second magnetic tile, the third magnetic tile, and the fourth magnetic tile, respectively, and obtain the following data:

[0025] b1-1, b1-2, b1-3,…, b1-i,…, b1-n;

[0026] b2-1, b2-2, b2-3,…, b2-i,…, b2-n;

[0027] b3-1, b3-2, b3-3,…, b3-i,…, b3-n;

[0028] b4-1, b4-2, b4-3,…, b4-i,…, b4-n;

[0029] Wherein, bj-i represents the magnetic induction intensity obtained by the Gaussmeter at a distance from the jth magnetic tile hi in the radial direction of the rotor main shaft;

[0030] Step 1-2, calculate the representative value bi of the magnetic induction intensity at the distance hi from the magnetic tile;

[0031] bi=(b1-i+ b2-i +b3-i+b4-i) / 4.

[0032] A motor air gap length testing system, which is used to detect the air gap length of a motor to be tested;

[0033] It includes:

[0034] A test station, on which the rotor main shaft of the motor to be tested is placed; the test station comprises: a test frame, a test fixture bottom plate, and a bearing seat; the test fixture bottom plate is installed in the middle of the test frame; the bearing seat is arranged on the upper part of the test fixture bottom plate, and the rotor main shaft of the motor to be tested is rotatably connected to the bearing seat;

[0035] A driving motor, the driving motor is connected to the rotor main shaft of the motor to be tested and can drive the rotor main shaft of the motor to be tested to rotate; the driving motor is installed on the lower surface of the test fixture bottom plate;

[0036] A gauss meter, which is used to measure magnetic induction intensity;

[0037] A two-dimensional fine-tuning mechanism is used to adjust the position of the Gaussmeter.

[0038] Further, the test station further comprises: a sensor fine-tuning support seat assembly; the sensor fine-tuning support seat assembly comprises: a vertical support frame and a sensor fine-tuning support seat; the vertical support frame is fixed to the upper part of the test fixture bottom plate; the sensor fine-tuning support seat is fixed to the vertical support frame;

[0039] The motor air gap length testing system also includes: an XY sensor, which is used to detect whether the rotor main shaft of the motor to be tested is offset after being rotated by the driven motor; the XY sensor is arranged in the middle of the sensor fine-tuning support seat, and the XY sensor is placed on the vertical support frame, and the position of the XY sensor is adjusted by the sensor fine-tuning support seat.

[0040] Furthermore, the two-dimensional fine-tuning mechanism includes: a vertical fixing member, a horizontal fixing member, a longitudinal moving member, a transverse moving member, a longitudinal moving top screw, a transverse moving top screw, a first vertical plate body, and a second vertical plate body;

[0041] The vertical fixing member is fixed on the bottom plate of the test fixture, and the horizontal fixing member is fixedly connected to the vertical fixing member;

[0042] The first vertical plate is fixedly connected to the horizontal fixed member, a thread is arranged on the outer side of the longitudinal movable top screw, a threaded hole is arranged on the first vertical plate, the longitudinal movable top screw passes through the threaded hole of the first vertical plate and is rotatably connected to the longitudinal movable member; the position of the longitudinal movable member is adjusted by rotating the longitudinal movable top screw;

[0043] The transverse moving member is arranged above the longitudinal moving member, and the transverse moving member can move transversely on the surface of the longitudinal moving member; a second vertical plate is fixedly arranged on the upper surface of the longitudinal moving member; a threaded hole is arranged on the second vertical plate, and a transverse moving top screw passes through the threaded hole of the second vertical plate and is rotatably connected to the transverse moving member; the position of the transverse moving member is adjusted by rotating the transverse moving top screw;

[0044] The Gauss meter is mounted on an end portion of the transverse moving member.

[0045] Furthermore, the longitudinal moving member and the horizontal fixing member are each provided with two corresponding longitudinal strip grooves, a bolt is inserted into each of the two longitudinal grooves, and the bolt is fixed to the horizontal fixing member through a nut;

[0046] The transverse moving member and the longitudinal moving member are both provided with two corresponding transverse strip grooves, and a bolt is inserted into each of the two transverse grooves. The bolt is fixed to the longitudinal moving member through a nut.

[0047] Furthermore, a longitudinal movement space is provided on the vertical fixing member, and the transverse movement top screw passes through the longitudinal movement space.

[0048] A method for testing the air gap length of a motor, wherein the rotor main shaft of the motor to be tested has four identical magnetic tiles, which are called: a first magnetic tile, a second magnetic tile, a third magnetic tile, and a fourth magnetic tile;

[0049] The air gap length test system of the motor to be tested is used to test the air gap length of the motor to be tested, including the following steps:

[0050] S100, placing the motor rotor main shaft in a vertical posture on the bearing seat of the test station, and connecting the drive motor to the main shaft;

[0051] S200, driving the motor to drive the main shaft to rotate so that the first magnetic tile faces the Gaussmeter;

[0052] S300, adjusting the position of the XY sensor so that the coaxiality between the rotor main shaft and the XY sensor meets the requirement in the initial state;

[0053] S400, obtaining magnetic induction intensity-distance relationship data of the first magnetic tile;

[0054] The magnetic induction intensity is measured at a distance of h1, h2, h3, ..., hi, ..., hn from the first magnetic tile, and the following data are obtained: b1-1, b1-2, b1-3, ..., b1-i, ..., b1-n;

[0055] S500, the driving motor drives the main shaft to rotate so that the second magnetic tile faces the Gaussmeter;

[0056] S600, uses an XY sensor to measure whether the coaxiality of the XY sensor and the motor rotor main shaft meets the requirements;

[0057] S700, obtaining magnetic induction intensity-distance relationship data of the second magnetic tile;

[0058] The magnetic induction intensity is measured at a distance of h1, h2, h3, ..., hi, ..., hn from the second magnetic tile, and the following data are obtained: b2-1, b2-2, b2-3, ..., b2-i, ..., b2-n;

[0059] S800, the driving motor drives the main shaft to rotate so that the third magnetic tile faces the Gaussmeter;

[0060] S900, uses an XY sensor to measure whether the coaxiality of the XY sensor and the motor rotor main shaft meets the requirements;

[0061] S1000, obtaining magnetic induction intensity-distance relationship data of the third magnetic tile;

[0062] The magnetic induction intensity is measured at a distance of h1, h2, h3, ..., hi, ..., hn from the third magnetic tile, and the following data are obtained: b3-1, b3-2, b3-3, ..., b3-i, ..., b3-n;

[0063] S1100, driving the motor to drive the main shaft to rotate so that the fourth magnetic tile faces the Gaussmeter;

[0064] S1200, uses an XY sensor to measure whether the coaxiality of the XY sensor and the motor rotor main shaft meets the requirements;

[0065] S1300, obtaining magnetic induction intensity-distance relationship data of the fourth magnetic tile;

[0066] The magnetic induction intensity is measured at a distance of h1, h2, h3, ..., hi, ..., hn from the fourth magnetic tile, and the following data are obtained: b4-1, b4-2, b4-3, ..., b4-i, ..., b4-n;

[0067] S1400, calculating a representative value bi of the magnetic induction intensity at a distance from the magnetic tile hi, where i is any natural number from 1 to n;

[0068] bi=(b1-i+ b2-i +b3-i+b4-i) / 4;

[0069] S1500, the n data points (h1, b1), (h2, b2), ..., (hn, bn) are linearly fitted and expressed as:

[0070] y=cx+d; c, d are fitting parameters;

[0071] S1600, after the motor rotor-stator assembly is completed, a Gauss meter is used to measure the magnetic induction intensity at different points on the stator surface in the circumferential direction: p1, p2, ..., pm;

[0072] S1700, solving the actual air gap length δ1 of the motor;

[0073] δ1=[(p1-d) / c+(p2-d) / c+……+(pm-d) / c] / m=[(p1+ p2+……+pm) / md] / c.

[0074] A motor performance detection method comprises the following steps:

[0075] Step 1, use the above method to obtain the actual air gap length δ1 of the motor;

[0076] Step 2: Calculate the actual bus voltage U bus :

[0077] U bus = k e w+ E0(R-δ1-r2) / (R- r2)+I motor R motor ;

[0078] Among them, k e is the back electromotive force constant, w is the rated speed of the motor shaft, E0 is the theoretical model back electromotive force value, R is the stator inner diameter, r2 is the design value of the rotor magnetic shoe outer diameter, I motor is the motor current, R motor is the internal resistance of the motor;

[0079] Step 3, evaluation of motor performance:

[0080] When 0.95[U bus ] bus <1.05[U bus ], the motor performance meets the requirements;

[0081] Otherwise, the motor performance does not meet the requirements;

[0082] Among them, [U bus ] is the bus voltage design value.

[0083] The beneficial effects of this application are:

[0084] First, the basic concept of the present application is that the present application proposes a basic idea for detecting the actual air gap length of the motor, thereby solving the problem that the actual air gap length of the motor cannot be accurately measured.

[0085] Specifically, the steps include:

[0086] 1.1, obtain the relationship between the magnetic induction intensity and distance of the magnetic shoe of the magnetic suspension pump motor rotor;

[0087] 1.2. After the motor rotor-stator assembly is completed, use a Gauss meter to measure the magnetic induction intensity at different points on the stator surface in the circumferential direction: p1, p2, ..., pm;

[0088] 1.3, based on the magnetic induction intensity in 1.2 and the relationship between the magnetic induction intensity and the distance obtained in 1.1, the actual air gap length of the motor can be determined.

[0089] Second, this application provides a method for evaluating motor performance (based on bus voltage):

[0090] ​2.1, obtain the actual air gap length δ1 of the motor;

[0091] 2.2, calculate the actual bus voltage U bus :

[0092] U bus = k e w+ E0(R-δ1-r2) / (R- r2)+I motor R motor ;

[0093] Among them, k e is the back electromotive force constant, w is the rated speed of the motor shaft, E0 is the theoretical model back electromotive force value, R is the stator inner diameter, r2 is the design value of the rotor magnetic shoe outer diameter, I motor is the motor current, R motor is the internal resistance of the motor, and these parameters are all known values;

[0094] 2.3, Evaluation of motor performance:

[0095] When 0.95[U bus ] bus <1.05[U bus ], the motor performance meets the requirements;

[0096] Otherwise, the motor performance does not meet the requirements;

[0097] Among them, [U bus ] is the bus voltage design value.

[0098] Third, the present application proposes a tooling for testing the actual air gap length of a motor, and its core design lies in: a test station 201, a drive motor 202, a Gaussmeter 204, and a two-dimensional fine-tuning mechanism 205; the main shaft is rotated by the drive motor 202 to detect the first magnetic tile, the second magnetic tile, the third magnetic tile, and the fourth magnetic tile respectively; the Gaussmeter is used to measure the magnetic induction intensity; the position of the Gaussmeter is adjusted by the two-dimensional fine-tuning mechanism, and the two-dimensional fine-tuning mechanism is adjusted to make the Gaussmeter fit the carbon tube surface of the rotor main shaft: the longitudinal moving top screw 2055 and the transverse moving top screw 2056 of the two-dimensional fine-tuning mechanism are adjusted to make the Gaussmeter fit the carbon tube surface of the rotor main shaft, and at the same time, the Gaussmeter is required to be located at the highest point of the magnetic tile arc of the main shaft; the two-dimensional fine-tuning mechanism is adjusted to move the top screw 2056 transversely so that the Gaussmeter moves away from the carbon tube surface of the main shaft in steps of 0.1 mm until 2.5 mm and records the surface magnetic data. BRIEF DESCRIPTION OF THE DRAWINGS

[0099] The present invention will be further described in detail below in conjunction with the embodiments in the accompanying drawings, but this does not constitute any limitation to the present invention.

[0100] Figure 1 ​is a schematic diagram of the motor rotor main shaft without the carbon cartridge applied.

[0101] Figure 2 It is a schematic diagram of the motor rotor main shaft after the carbon tube is applied.

[0102] Figure 3 It is a three-dimensional structural diagram of the air gap length test system of the magnetic levitation molecular pump motor.

[0103] Figure 4 It is the main facade of the air gap length test system of the magnetic levitation molecular pump motor.

[0104] Figure 5 It is the side elevation of the air gap length test system of the magnetic levitation molecular pump motor.

[0105] Figure 6 This is a diagram showing the relationship between the sensor fine-tuning support assembly and the XY sensor.

[0106] Figure 7 It is a schematic diagram of the three-dimensional structure of the two-dimensional fine-tuning mechanism.

[0107] Figure 8 It is a schematic diagram of the three-dimensional structure of the two-dimensional fine-tuning mechanism from another perspective.

[0108] Fig. 9 It is a schematic diagram of the three-dimensional structure of the two-dimensional fine-tuning mechanism from other perspectives.

[0109] Fig.10 It is a top view of the two-dimensional fine-tuning mechanism.

[0110] The following are the descriptions of the reference numerals:

[0111] Main shaft 100, magnetic shoe 101, spacer 102, carbon cylinder 103;

[0112] Motor air gap length testing system 200, testing station 201, driving motor 202, XY sensor 203, Gauss meter 204, two-dimensional fine-tuning mechanism 205;

[0113] Test frame 2011, test tooling base plate 2012, bearing seat 2013, sensor fine-tuning support seat assembly 2014;

[0114] A vertical fixing member 2051 , a horizontal fixing member 2052 , a longitudinal moving member 2053 , a transverse moving member 2054 , a longitudinal moving top screw 2055 , a transverse moving top screw 2056 , a first vertical plate 2056 , and a second vertical plate 2057 . DETAILED DESCRIPTION

[0115] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0116] <1. Basic ideas for detecting the actual air gap length of the motor>

[0117] The basic scheme for detecting the actual air gap length of the magnetic levitation molecular pump motor in this application is as follows:

[0118] Step 1, obtain the distance-magnetic induction intensity dataset of the magnetic tile;

[0119] First, if Figure 1 As shown, there are four identical magnetic tiles on the rotor main shaft 100 of the motor to be tested, which are called: the first magnetic tile, the second magnetic tile, the third magnetic tile, and the fourth magnetic tile;

[0120] The corresponding magnetic induction intensities are measured at the distances from the first magnetic tile, the second magnetic tile, the third magnetic tile, and the fourth magnetic tile (the lengths along the radial direction of the main axis) of h1, h2, h3, ..., hi, ..., hn, respectively, and the following data are obtained:

[0121] b1-1, b1-2, b1-3,…, b1-i,…, b1-n;

[0122] b2-1, b2-2, b2-3,…, b2-i,…, b2-n;

[0123] b3-1, b3-2, b3-3,…, b3-i,…, b3-n;

[0124] b4-1, b4-2, b4-3,…, b4-i,…, b4-n;

[0125] Wherein, bj-i represents the magnetic induction intensity obtained by the Gaussmeter at a distance from the jth magnetic tile hi in the radial direction of the rotor main shaft;

[0126] Secondly, calculate the representative value bi of the magnetic induction intensity at the distance hi from the magnetic tile;

[0127] bi=(b1-i+ b2-i +b3-i+b4-i) / 4;

[0128] Step 2, fit the n data points (h1, b1), (h2, b2), ..., (hn, bn) in a linear manner, which can be expressed as:

[0129] Y=cx+d; c, d are fitting parameters;

[0130] Step 3, after the motor rotor-stator assembly is completed, a Gauss meter is used to measure the magnetic induction intensity at different points on the circumference of the stator (all on the outer surface of the stator), and the following measurement results are obtained: p1, p2, ..., pm;

[0131] Step 4, solve the actual air gap length δ1 of the motor;

[0132] δ1=[(p1-d) / c+(p2-d) / c+……+(pm-d) / c] / m=[(p1+ p2+……+pm) / md] / c.

[0133] <2. Basic ideas for motor performance testing>

[0134] 2.1, for the motor, the design air gap length δ can be expressed as:

[0135] δ = R - r2;

[0136] Where R represents the inner diameter of the stator, and r2 represents the design value of the outer diameter of the rotor magnetic shoe;

[0137] 2.2, for the actual air gap length δ1, it can be expressed as:

[0138] δ1=R-r1;

[0139] Among them, r1 represents the actual value of the outer diameter of the rotor magnetic shoe;

[0140] 2.3, the air gap compensation coefficient k can be expressed as:

[0141] k=(δ-δ1) / δ=(r1- r2) / (R- r2).

[0142] 2.4, for the magnetic levitation molecular pump, due to the change in air gap length, the required compensation back EMF value E 补 for:

[0143] E 补 =kE0;

[0144] Where E0 represents the back EMF value of the theoretical model.

[0145] 2.5, the actual back electromotive force value E of the main shaft of the rotor motor to be tested at the rated speed w 实际 for:

[0146] E 实际 =k e w+E 补 ;

[0147] Among them, k eis the back electromotive force constant.

[0148] 2.6, When the motor is running, the actual value of the bus voltage U bus The following relationship is satisfied between the back electromotive force:

[0149] U bus =E 实际 +I motor R motor =k e w+E 补 +I motor R motor =k e w+E 补 +I motor R motor =k e w+(r1- r2) / (R- r2)E0+I motor R motor ;

[0150] Among them, I motor Represents the motor current, R motor Indicates the internal resistance of the motor;

[0151] The above formula establishes: The actual value of bus voltage U bus In actual work, the actual value of bus voltage U can be obtained according to δ1. bus , the evaluation of motor performance (bus voltage) is as follows:

[0152] When 0.95[U bus ] bus <1.05[U bus ], meet the requirements; [U bus ] represents the bus voltage design value, whose magnitude is k e w+I motor R motor .

[0153] Otherwise, the requirement is not met.

[0154] <III. Example 1: A magnetic levitation molecular pump motor air gap length test system>

[0155] Figure 3 The three-dimensional structure of the air gap length test system of the magnetic levitation molecular pump motor is schematically shown. Figure 4 The main facade structure of the air gap length test system of the magnetic levitation molecular pump motor is schematically shown. Figure 5 The side elevation structure of the air gap length test system for the magnetic levitation molecular pump motor is shown schematically.

[0156] from Figure 3-5 ​It can be seen that the motor to be tested is tested by the motor air gap length testing system 200. The motor air gap length testing system 200 includes:

[0157] a, a test station 201, on which the rotor main shaft 100 of the motor to be tested is placed; the test station 201 comprises: a test frame 2011, a test tooling bottom plate 2012, a bearing seat 2013, and a sensor fine-tuning support seat assembly 2014;

[0158] The test fixture base plate 2012 is installed in the middle of the test rack 2011;

[0159] The bearing seat 2013 is arranged on the test fixture bottom plate 2012, and the rotor main shaft 100 of the motor to be tested is rotatably connected to the bearing seat 2013;

[0160] The sensor fine-tuning support seat assembly 2014 includes: a vertical support frame and a sensor fine-tuning support seat; the vertical support frame is fixed to the upper part of the test fixture bottom plate 2012; the sensor fine-tuning support seat is fixed to the vertical support frame;

[0161] b, a driving motor 202, wherein the driving motor 202 is connected to the rotor main shaft 100 of the motor to be tested and can drive the rotor main shaft 100 of the motor to be tested to rotate; the driving motor 202 is installed on the lower surface of the test fixture bottom plate 2012;

[0162] c, XY sensor 203, the XY sensor 203 detects whether the rotor spindle of the motor to be detected is offset after being rotated by the driven motor; the XY sensor 203 is arranged in the middle of the sensor fine-tuning support seat, the XY sensor 203 is placed on the vertical support frame, and the position of the XY sensor 203 is adjusted by the sensor fine-tuning support seat;

[0163] d, a gauss meter 204, the gauss meter 204 is used to measure the magnetic induction intensity;

[0164] e. A two-dimensional fine-tuning mechanism 205 , which is used to adjust the position of the Gaussmeter 204 .

[0165] Figure 6The diagram shows the relationship between the sensor fine-tuning support base assembly 2014 and the XY sensor 203. The displacement adjustment of the XY sensor 203 is as follows: the sensor fine-tuning support base assembly 2014 is provided with two X-direction threaded holes and two Y-direction threaded holes in the same straight line; the X-direction and Y-direction threaded holes are both provided with top screws; the X-direction and Y-direction are mutually perpendicular and both are on the horizontal plane; the X-direction and Y-direction top screws are both in contact with the XY sensor 203, and the displacement movement of the XY sensor 203 is achieved through the two X-direction and Y-direction top screws.

[0166] Figure 7 , Figure 8 , Fig. 9 , Fig.10 The structural design of the two-dimensional fine-tuning mechanism 205 is illustrated from different angles. The two-dimensional fine-tuning mechanism 205 includes: a vertical fixing member 2051, a horizontal fixing member 2052, a longitudinal moving member 2053, a transverse moving member 2054, a longitudinal moving top screw 2055, a transverse moving top screw 2056, a first vertical plate 2056, and a second vertical plate 2057;

[0167] The vertical fixing member 2051 is fixed on the test fixture bottom plate 2012, and the horizontal fixing member 2052 is fixedly connected to the vertical fixing member 2051;

[0168] The longitudinal moving member 2053 and the horizontal fixing member 2052 are both provided with two corresponding longitudinal strip grooves, and a bolt is inserted into each of the two longitudinal grooves, and the bolt is fixed to the horizontal fixing member 2052 through a nut; the purpose of the above design is to provide a guiding effect, that is, when the longitudinal moving member 2053 moves on the surface of the horizontal fixing member 2052, it can move along the direction of the longitudinal strip groove (the direction of the longitudinal strip groove is parallel to the direction of the longitudinal moving top screw 2055);

[0169] The transverse moving member 2054 and the longitudinal moving member 2053 are both provided with two corresponding transverse strip grooves, and a bolt is inserted into each of the two transverse grooves, and the bolt is fixed to the longitudinal moving member 2053 by a nut; the purpose of the above design is to provide a guiding effect, that is, when the transverse moving member 2054 moves on the surface of the longitudinal moving member 2053, it can move along the direction of the transverse strip groove (the direction of the transverse strip groove is parallel to the direction of the transverse moving top screw 2056);

[0170] The first vertical plate 2056 is fixedly connected to the horizontal fixed member 2052. The outer side of the longitudinal movable top screw 2055 is provided with a thread. A threaded hole is provided on the first vertical plate 2056. The longitudinal movable top screw 2055 passes through the threaded hole of the first vertical plate 2056 and is rotatably connected to the longitudinal movable member 2053 (the rotatable connection adopts a bearing connection, Figure 7~Figure 9 The bearing is not shown); the position of the longitudinal moving member 2053 is adjusted by rotating the longitudinal moving top screw 2055;

[0171] The transverse moving member 2054 is arranged above the longitudinal moving member 2053, and the transverse moving member 2054 can move transversely on the surface of the longitudinal moving member 2053; a second vertical plate 2057 is fixedly arranged on the upper surface of the longitudinal moving member 2053; a threaded hole is arranged on the second vertical plate 2057, and the transverse moving top screw 2056 passes through the threaded hole of the second vertical plate 2057 and is rotatably connected to the transverse moving member 2054 (the rotatable connection adopts a bearing connection, Figure 7~Figure 9 The bearing is not shown); the position of the lateral moving member 2054 is adjusted by rotating the lateral moving top screw 2056.

[0172] The Gauss meter 204 is mounted on the end of the transverse moving member 2054 .

[0173] When the longitudinal moving member 2053 moves, the transverse moving top screw 2056, the transverse moving member 2054, the second vertical plate 2057, and the transverse moving top screw 2056 all move in the longitudinal direction. In order to facilitate the operation of the transverse moving top screw 2056, the transverse moving top screw 2056 needs to extend to the outside of the vertical fixed member 2051. To this end, a longitudinal moving space 2051-1 is provided on the vertical fixed member 2051, and the transverse moving top screw 2056 passes through the longitudinal moving space 2051-1 (the two do not contact each other).

[0174] It should be noted that the two-dimensional fine adjustment mechanism 205 can enable the Gauss meter 204 to move in the horizontal plane. Figure 7 structure, other structures such as a robotic arm may also be used.

[0175] <IV. Example 2: A method for testing the air gap length of a magnetic levitation molecular pump motor>

[0176] The air gap length testing system for the magnetic levitation molecular pump motor of the first embodiment is used to test the air gap length of the magnetic levitation molecular pump motor to be tested, which includes the following steps:

[0177] S100, placing the motor rotor main shaft in a vertical position on the bearing seat 2013 of the test station, and connecting the drive motor 202 to the main shaft;

[0178] S200, driving the motor 202 to drive the main shaft to rotate so that the first magnetic tile faces the Gaussmeter;

[0179] S300, adjusting the position of the XY sensor so that the coaxiality between the rotor main shaft and the XY sensor in the initial state meets the requirement: adjusting the top screw on the sensor fine-tuning support seat by reading the data detected by the XY sensor to ensure the coaxiality between the motor rotor main shaft and the XY sensor in the initial state;

[0180] S400, obtaining magnetic induction intensity-distance relationship data of the first magnetic tile:

[0181] Adjust the two-dimensional fine-tuning mechanism so that the Gaussmeter fits the surface of the carbon tube of the rotor main shaft: adjust the longitudinal moving top screw 2055 and the transverse moving top screw 2056 of the two-dimensional fine-tuning mechanism so that the Gaussmeter fits the surface of the carbon tube of the rotor main shaft, and at the same time, the Gaussmeter is required to be located at the highest point of the arc of the first magnetic shoe of the main shaft; (It should be noted that the coaxiality error between the main shaft carbon tube and the rotor main shaft is within 5 μm, so the coaxiality error can be ignored);

[0182] Adjust the two-dimensional fine-tuning mechanism to laterally move the top screw 2056, so that the Gauss meter moves away from the surface of the spindle carbon cylinder by 0.1 mm in steps until it is 2.5 mm away and record the surface magnetic data (i.e., record 26 sets of distance-magnetic induction intensity data); during the measurement, the lateral movement direction is the radial direction of the spindle;

[0183] S500, driving the motor 202 to drive the main shaft to rotate so that the second magnetic tile faces the Gaussmeter;

[0184] S600 uses an XY sensor to measure whether the coaxiality between the XY sensor and the motor rotor main shaft meets the requirements (essentially, it measures whether the coaxiality between the main shaft and the drive motor drive shaft meets the requirements);

[0185] S700, obtaining magnetic induction intensity-distance relationship data of the second magnetic tile:

[0186] Adjust the two-dimensional fine-tuning mechanism so that the Gaussmeter fits the carbon tube surface of the rotor spindle: adjust the longitudinal moving top screw 2055 and the transverse moving top screw 2056 of the two-dimensional fine-tuning mechanism so that the Gaussmeter fits the carbon tube surface of the rotor spindle, and at the same time, the Gaussmeter is required to be located at the highest point of the arc of the second magnetic shoe of the spindle; adjust the transverse moving top screw 2056 of the two-dimensional fine-tuning mechanism so that the Gaussmeter moves away from the carbon tube surface of the spindle in steps of 0.1 mm until 2.5 mm and record the surface magnetic data (i.e., record 26 sets of distance-magnetic induction intensity data);

[0187] S800, driving the motor 202 to drive the main shaft to rotate so that the third magnetic tile faces the Gaussmeter;

[0188] S900 uses an XY sensor to measure whether the coaxiality between the XY sensor and the motor rotor main shaft meets the requirements (essentially, it measures whether the coaxiality between the main shaft and the drive motor drive shaft meets the requirements);

[0189] S1000, obtaining magnetic induction intensity-distance relationship data of the third magnetic tile:

[0190] Adjust the two-dimensional fine-tuning mechanism so that the Gaussmeter fits the carbon tube surface of the rotor main shaft: adjust the longitudinal moving top screw 2055 and the transverse moving top screw 2056 of the two-dimensional fine-tuning mechanism so that the Gaussmeter fits the carbon tube surface of the rotor main shaft, and at the same time, the Gaussmeter is required to be located at the highest point of the arc of the third magnetic shoe of the main shaft; adjust the transverse moving top screw 2056 of the two-dimensional fine-tuning mechanism so that the Gaussmeter is away from the carbon tube surface of the main shaft by 0.1 mm in steps until 2.5 mm and record the surface magnetic data (i.e., record 26 sets of distance-magnetic induction intensity data);

[0191] S1100, driving the motor 202 to drive the main shaft to rotate so that the fourth magnetic tile faces the Gaussmeter;

[0192] S1200 uses an XY sensor to measure whether the coaxiality between the XY sensor and the motor rotor main shaft meets the requirements (essentially, it measures whether the coaxiality between the main shaft and the drive motor drive shaft meets the requirements);

[0193] S1300, obtaining magnetic induction intensity-distance relationship data of the fourth magnetic tile:

[0194] Adjust the two-dimensional fine-tuning mechanism to make the Gaussmeter fit the carbon tube surface of the rotor main shaft: adjust the longitudinal moving top screw 2055 and the transverse moving top screw 2056 of the two-dimensional fine-tuning mechanism to make the Gaussmeter fit the carbon tube surface of the rotor main shaft, and at the same time require the Gaussmeter to be located at the highest point of the fourth magnetic shoe arc of the main shaft; adjust the transverse moving top screw 2056 of the two-dimensional fine-tuning mechanism to make the Gaussmeter move away from the carbon tube surface of the main shaft in steps of 0.1 mm until it is 2.5 mm and record the surface magnetic data (i.e., record 26 sets of distance-magnetic induction intensity data).

[0195] The physical meanings of the symbols in this application are as follows:

[0196] h1, h2, h3, ..., hi, ..., hn: measuring magnetic induction intensity at n different distances from the magnetic tile;

[0197] n, m: both are natural numbers greater than or equal to 10;

[0198] bj-i: The magnetic induction intensity obtained by the Gaussmeter at the distance from the jth magnetic tile hi in the radial direction of the rotor main shaft;

[0199] bi: representative value of magnetic induction intensity at distance hi from magnetic tile, generally using average value b1-i+ b2-i +b3-i+b4-i) / 4;

[0200] c, d: fitting parameters representing the linear relationship between the distance of the magnetic tile and the magnetic induction intensity;

[0201] p1, p2, ..., pm: magnetic induction intensity;

[0202] δ: Designed air gap length;

[0203] δ1: actual air gap length of the motor;

[0204] R: stator inner diameter;

[0205] r1: actual value of rotor magnetic shoe outer diameter;

[0206] r2; design value of rotor magnetic shoe outer diameter;

[0207] k: air gap compensation coefficient;

[0208] E 补 : Compensation for back EMF value;

[0209] E0: theoretical model back potential value;

[0210] k e : Back electromotive force constant;

[0211] E 实际 : actual back electromotive force value;

[0212] w: rated speed of the motor spindle;

[0213] U bus : Actual value of bus voltage;

[0214] I motor : Motor current;

[0215] R motor : Motor internal resistance;

[0216] [U bus ]: Bus voltage design value.

[0217] The above embodiments are preferred implementation modes of the present invention and are only used to facilitate the description of the present invention. They are not intended to limit the present invention in any form. Any person with ordinary knowledge in the relevant technical field, if they do not depart from the scope of the technical features of the present invention, can make equivalent embodiments by partial changes or modifications to the technical contents disclosed in the present invention, and they still fall within the scope of the technical features of the present invention without departing from the technical features of the present invention.

Claims

1. A motor performance detection method, characterized in that: The steps include: Step 1, using the motor air gap length test method to obtain the actual air gap length δ1 of the motor; Step 2: Calculate the actual bus voltage U bus : AT bus = k e in+ E0(R-δ1-r2) / (R- r2)+I motor R motor ; Among them, k e is the back electromotive force constant, w is the rated speed of the motor shaft, E0 is the theoretical model back electromotive force value, R is the stator inner diameter, r2 is the design value of the rotor magnetic shoe outer diameter, I motor is the motor current, R motor is the internal resistance of the motor; Step 3, evaluation of motor performance: When 0.95[U bus ] bus <1.05[U bus ], the motor performance meets the requirements;​ Otherwise, the motor performance does not meet the requirements; Among them, [U bus ] is the bus voltage design value; The motor air gap length testing method comprises the following steps: Step A, obtain the distance-magnetic induction intensity data set of the rotor main shaft magnetic shoe of the motor to be tested: (h1, b1), (h2, b2), ..., (hi, bi), ..., (hn, hn); Among them, h1, h2, h3, ..., hi, ..., hn represent the length from the magnetic tile; Among them, b1, b2, b3, ..., bi, ..., bn represent the representative values ​​of magnetic induction intensity corresponding to the distance from the magnetic tile being h1, h2, h3, ..., hi, ..., hn; Step B, express the n data points (h1, b1), (h2, b2), ..., (hn, bn) in a linear fitting manner as follows: y=cx+d; c, d are fitting parameters; Step C, after the motor rotor-stator assembly is completed, use a Gauss meter to measure the magnetic induction intensity at different points on the stator surface in the circumferential direction: p1, p2, ..., pm; Step D, solve the actual air gap length δ1 of the motor; δ1=[(p1-d) / c+(p2-d) / c+……+(pm-d) / c] / m=[(p1+ p2+……+pm) / md] / c.

2. A motor performance detection method according to claim 1, characterized in that: There are four identical magnetic tiles on the rotor main shaft of the motor to be tested, which are called: the first magnetic tile, the second magnetic tile, the third magnetic tile, and the fourth magnetic tile; StepA also includes the following sub-steps: Step A-1, measure the magnetic induction intensity at the distances h1, h2, h3, ..., hi, ..., hn from the first magnetic tile, the second magnetic tile, the third magnetic tile, and the fourth magnetic tile, respectively, and obtain the following data: b1-1, b1-2, b1-3,…, b1-i,…, b1-n; b2-1, b2-2, b2-3,…, b2-i,…, b2-n; b3-1, b3-2, b3-3,…, b3-i,…, b3-n; b4-1, b4-2, b4-3,…, b4-i,…, b4-n; Wherein, bj-i represents the magnetic induction intensity obtained by the Gaussmeter at a distance from the jth magnetic tile hi in the radial direction of the rotor main shaft; Step A-2, calculate the representative value bi of the magnetic induction intensity at the distance hi from the magnetic tile; bi=(b1-i+ b2-i +b3-i+b4-i) / 4.

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