Motor dielectric loss test method considering stator and rotor ditching effect and axial flow

Abstract

The invention relates to a motor dielectric loss test method considering stator and rotor ditching effect and axial flow. S1, manufacturing an experimental motor and a test model; s2, testing no-load loss of the experimental motor and obtaining no-load input power; s3, testing the motor input power of the experimental motor with the test model load, and solving the mechanical loss; s4, testing the no-load input power of the experimental motor under the working condition of no axial flow; s5, testing the load input power of the experimental motor with different types of test model loads; s6, analyzing the influence of the ditching effect on the friction loss of the medium; s7, testing the no-load input power of the experimental motor under the working condition of axial flow; s8, under the working condition that axial flow exists, the load input power of the experiment motor with different types of test model loads is tested; and S9, analyzing the influence of axial flow on the friction loss of the motor medium. According to the invention, the dielectric friction loss change caused by the groove region can be directly measured, and the accuracy of motor design is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a motor dielectric loss testing method taking into account the stator and rotor ditching effect and axial flow. Background Art

[0002] For motors filled with medium, such as submerged motors with open structures, the medium will generate medium friction loss when the motor is running. The current test method for medium friction loss in motors is usually to manufacture a test model, where the stator and rotor of the motor are not grooved, and the other dimensions are the same as the experimental motor. The losses under the conditions of the assembled and unassembled test models are tested at the same speed, and the difference between the two tests is the medium friction loss at the speed. Conventional measurement methods ignore the influence of the groove effect of the stator and rotor, and it is impossible to determine the medium friction loss caused by the groove effect. At the same time, conventional medium friction loss also ignores the change in medium friction loss caused by axial flow. Since there is no accurate medium friction loss analysis and calculation method that considers the groove effect and axial flow, this leads to a lack of basis for the design of the groove when designing the motor, and the calculation accuracy of the medium friction loss is not high. When calculating the total loss of the motor, the influence of the groove effect and the axial flow of the medium on the overall performance of the motor has a high uncertainty, which also leads to uncertainty in the calculation results of the motor temperature field. Therefore, the conventional medium loss test method will lead to uncertainty in motor design, and it is difficult to provide sufficient experimental data support for the accurate design of the motor. Summary of the invention

[0003] In order to solve the problem that the conventional dielectric loss test method has uncertainty and is difficult to provide sufficient experimental data support for the accurate design of the motor, the present invention provides a motor dielectric friction loss test method that takes into account the stator and rotor groove effect and axial flow for the motor.

[0004] The technical solution adopted by the present invention is:

[0005] The motor dielectric loss test method considering the stator and rotor groove effect and axial flow includes the following steps:

[0006] S1. Manufacture experimental motors and test models;

[0007] S2. Test the no-load loss of the experimental motor and obtain the no-load input power;

[0008] S3. Test the motor input power of the experimental motor with the test model load and obtain the mechanical loss;

[0009] S4. Place the experimental motor in a container filled with medium and test the no-load input power of the experimental motor under the condition of no axial flow;

[0010] S5. Test the load input power of the experimental motor with different types of test model loads;

[0011] S6. Analyze the influence of ditching effect on medium friction loss;

[0012] S7. Place the experimental motor in a container filled with medium, and test the no-load input power of the experimental motor under the condition of axial flow;

[0013] S8. Connect the experimental motor and the test model and place them in a container filled with medium. Under the condition of axial flow, test the load input power of the experimental motor when carrying different types of test model loads;

[0014] S9. Analyze the effect of axial flow on motor medium friction loss.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The dielectric friction loss test method considering the groove effect proposed in the present invention can directly measure the dielectric friction loss changes caused by the groove area, thereby improving the accuracy of motor design.

[0017] 2. The test method for medium friction loss considering axial flow proposed in the present invention can directly measure the medium friction loss generated in the annular area and the loss change caused by the ditching effect under the working condition of axial flow, thereby improving the accuracy of the motor temperature field calculation.

[0018] 3. The present invention improves the accuracy of medium friction loss calculation, and avoids the problem of material waste or excessive temperature rise caused by unreasonable motor design due to inaccurate loss calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the test model type of the present invention;

[0020] Figure 2 It is the experimental motor installation method of the present invention;

[0021] Figure 3 is a flow chart of the medium friction loss test of the present invention; DETAILED DESCRIPTION

[0022] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0023] The core idea of ​​the present invention is to analyze the influence of stator and rotor grooves and axial flow on medium friction loss according to no-load and load experiments at the same speed under different working conditions.

[0024] The present invention provides a method for testing the dielectric loss of a motor taking into account the stator and rotor ditching effect and axial flow, comprising the following steps:

[0025] A. Processing experimental motors and test models:

[0026] S1. Manufacture experimental motors and test models;

[0027] The test model serves as the load of the experimental motor, and its difference from the experimental motor lies in the stator and rotor structures;

[0028] The test models are divided into four categories: no grooves on both the stator and rotor, grooves on both the stator and rotor, grooves on the stator and no grooves on the rotor, and grooves on the stator and no grooves on the rotor. Figure 1 shown. Figure 1 (a) Both the stator and the rotor are grooved. Figure 1 (b) There are no grooves on the stator and rotor. Figure 1 (c) The stator is grooved but the rotor is not grooved. Figure 1 (d) The stator is not grooved but the rotor is grooved;

[0029] The test model is a solid steel structure with no copper or iron loss.

[0030] B. Experimental test steps:

[0031] S2. Test the no-load loss of the experimental motor and obtain the no-load input power;

[0032] The no-load loss of the experimental motor is tested in the air through a no-load experiment. The input power of the experimental motor can be obtained by measuring the terminal voltage and winding current of the motor winding. The no-load input power P0 in the air is equal to the iron loss p generated by the operation of the experimental motor. Fe 、Copper consumption 0Cu , mechanical loss p mec The sum of the winding current and winding resistance is shown in formula (1). The copper loss can be obtained by measuring the winding current and winding resistance.

[0033] P0=p Fe +p 0Cu +p mec (1)

[0034] S3. Test the motor input power of the experimental motor with the test model load and obtain the mechanical loss;

[0035] In air, the motor input power of the test motor under the same speed test model load is the same as the stator and rotor of the test motor. Since the mechanical structure of the test motor and the test model is the same except for the stator and rotor, it can be considered that the mechanical loss of the test motor and different types of test models is the same. The input power P1 of the test motor under load is equal to the iron loss p generated by the operation of the test motor. Fe 、Copper consumption1Cu , mechanical loss p mec Mechanical losses p of the test model load mec The sum of is shown in formula (2). Considering that the load is small, the magnetic field has little effect, so it can be considered that the load iron loss is the same as the no-load iron loss.

[0036] P1=(p Fe +p 1Cu +p mec )+p mec (2)

[0037] According to the test results of no-load input power P0 and load input power P1 in air, the mechanical loss p can be calculated. mec , as shown in formula (3).

[0038] p mec =P1-P0-p 1Cu +p 0Cu (3)

[0039] S4. Place the experimental motor in a container filled with medium and test the no-load input power P of the experimental motor under the condition of no axial flow. 0JZ ,

[0040] No-load input power P when there is no axial flow 0JZ Equal to the iron loss p generated by the experimental motor operation Fe 、Copper consumption 0CuJZ , mechanical loss p mec and medium friction loss p JZ The sum of is shown in formula (4).

[0041] P 0JZ =p Fe +p 0CuJZ +p mec +p JZ (4)

[0042] S5. Test the load input power of the experimental motor with different types of test model loads;

[0043] Connect the experimental motor and the test model and place them in a container filled with medium, such as Figure 2 As shown in the figure, when the axial flow velocity is 0m / s, that is, when there is no axial flow, the input power of the test motor with different types of test model loads; when there is no axial flow, the load input power P 1JZ Equal to the iron loss p generated by the operation of the experimental motor Fe 、Copper consumption 1CuJZ , mechanical loss p mec and medium friction loss p JZ Mechanical losses with test model load pmec and medium friction loss p xx The sum of the medium friction loss p is shown in formula (5). xx is the medium friction loss that does not specify the test model type, when p xx For p gb When p is , it means that the load of the experimental motor is the test model with stator grooves and rotor without grooves; when p is xx For p bg When p is the load, it means the stator is not grooved and the rotor is grooved. xx For p gg When p is the load, it means the stator groove and rotor groove test model is used; when p is the load, it means the stator groove and rotor groove test model is used; xx For p bb When , it means the load is the test model with no stator grooves and no rotor grooves;

[0044] P 1JZ =(p Fe +p 1CuJZ +p mec +p JZ )+(p mec +p xx ) (5)

[0045] S6. According to equations (1) to (5), the medium friction loss is obtained under the condition of no axial flow, when neither the stator nor the rotor has grooves, when both the stator and the rotor have grooves, when the stator has grooves but the rotor has no grooves, and when the stator has no grooves but the rotor has grooves, and the influence of the groove effect on the medium friction loss is analyzed by loss separation;

[0046] According to the no-load input power P in the medium 0JZ and load input power P 1JZ The test results can be used to obtain the test model loss P in the medium without axial flow. mx , as shown in formula (6).

[0047] P MX =P 1JZ -P 0JZ -p 1CuJZ +p 0CuJZ =p mec +p xx (6)

[0048] According to the test model loss P in the medium without axial flow MX and mechanical loss p mec The calculation results can be used to obtain the medium friction loss p when there is no axial flow. xx , as shown in formula (7).

[0049] p xx =P MX -pmec (7)

[0050] According to the medium friction loss p when there is no axial flow xx , the influence of the ditching effect on the friction loss of the medium under the condition of no axial flow can be obtained, as shown in formula (8).

[0051]

[0052] S7. Place the experimental motor in a container filled with medium and test the no-load input power P of the experimental motor under the condition of axial flow. 0JZ1 ;

[0053] No-load input power P when there is axial flow 0JZ1 Equal to the iron loss p generated by the operation of the experimental motor Fe 、Copper consumption 0CuJZ1 , mechanical loss p mec and medium friction loss p JZ1 The sum of is shown in formula (9).

[0054] P 0JZ1 =p Fe +p 0CuJZ1 +p mec +p JZ1 (9).

[0055] S8. Connect the experimental motor and the test model and place them in a container filled with medium, such as Figure 2 As shown, under the condition of axial flow, the load input power of the test motor with different types of test model loads;

[0056] Load input power P when there is axial flow 1JZ1 Equal to the iron loss p generated by the operation of the experimental motor Fe 、Copper consumption 1CuJZ1 , mechanical loss p mec and medium friction loss p JZ1 Mechanical losses with test model load p mec and medium friction loss p xx1 The sum of is shown in formula (10).

[0057] P 1JZ1 =(p Fe +p 1CuJZ1 +p mec +p JZ )+(p xx1 +p mec ) (10).

[0058] S9. According to equations (1), (2), (9) and (10), the medium friction loss under the conditions of axial flow is obtained through loss separation when neither the stator nor the rotor has grooves, both the stator and the rotor have grooves, the stator has grooves but the rotor does not, and the stator has no grooves but the rotor has grooves. The influence of axial flow on the medium friction loss of the motor is analyzed to provide experimental data support for the design of the motor groove.

[0059] According to the no-load input power P when there is axial flow 0JZ1 and load input power P 1JZ1 The test results show that the loss P of the test model in the presence of axial flow can be obtained. mx1 , as shown in formula (11).

[0060] P MX1 =P 1JZ1 -P 0JZ1 -p 1CuJZ1 +p 0CuJZ1 =p mec +p xx1 (11)

[0061] According to the test model loss P in the presence of axial flow MX1 and mechanical loss p mec The calculation results can be used to obtain the medium friction loss p when there is axial flow. xx1 , as shown in formula (12).

[0062] p xx1 =P MX1 -p mec (12)

[0063] According to the medium friction loss p when there is axial flow xx1 and the medium friction loss p when there is no axial flow xx , the effect of axial flow on medium friction loss can be obtained, as shown in formula (13).

[0064]

[0065] C. Data Analysis:

[0066] The measured effects of the stator and rotor groove effects and axial flow on the motor medium friction loss are summarized to provide experimental data support for motor design.

[0067] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A method for testing the dielectric loss of a motor taking into account the stator-rotor ditching effect and axial flow, characterized in that: The following steps are involved: S1. Manufacture experimental motors and test models; S2. Test the no-load loss of the experimental motor and obtain the no-load input power; S3. Test the motor input power of the experimental motor with the test model load and obtain the mechanical loss; S4. Place the experimental motor in a container filled with medium and test the no-load input power of the experimental motor under the condition of no axial flow; S5. Test the load input power of the experimental motor with different types of test model loads; S6. Analyze the influence of ditching effect on medium friction loss; S7. Place the experimental motor in a container filled with medium, and test the no-load input power of the experimental motor under the condition of axial flow; S8. Connect the experimental motor and the test model and place them in a container filled with medium. Under the condition of axial flow, test the load input power of the experimental motor when carrying different types of test model loads; S9. Analyze the effect of axial flow on motor medium friction loss.

2. The motor dielectric loss test method considering the stator and rotor ditching effect and axial flow according to claim 1 is characterized in that: The test model in S1 is used as the load of the experimental motor. The test models are divided into four categories: no grooves on both the stator and rotor, grooves on both the stator and rotor, grooves on the stator and no grooves on the rotor, and grooves on the stator and no grooves on the rotor.

3. The motor dielectric loss test method considering the stator and rotor ditching effect and axial flow according to claim 2 is characterized in that: The specific method for testing the no-load loss of the experimental motor and obtaining the no-load input power in S2 is: The no-load loss of the experimental motor is tested by a no-load experiment in the air. The input power of the experimental motor is obtained by measuring the terminal voltage and winding current of the motor winding. The no-load input power P0 in the air is equal to the iron loss p generated by the operation of the experimental motor. Fe 、Copper consumption 0Cu , mechanical loss p mec The sum of the copper loss is obtained by measuring the winding current and winding resistance. P0=p Fe +p 0Cu +p mec (1)。 4. The motor dielectric loss test method considering the stator and rotor ditching effect and axial flow according to claim 3 is characterized in that: The calculation method of the motor input power and mechanical loss in S3 is: The input power P1 of the experimental motor under load is equal to the iron loss p generated by the operation of the experimental motor. Fe 、Copper consumption 1Cu , mechanical loss p mec Mechanical losses with test model load p mec the sum of P1=(p Fe +p 1Cu +p mec )+p mec (2); According to the test results of no-load input power P0 and load input power P1 in air, the mechanical loss p can be calculated. mec , p mec =P1-P0-p 1Cu +p 0Cu (3)。 5. The motor dielectric loss test method considering the stator and rotor ditching effect and axial flow according to claim 4 is characterized in that: The calculation method of no-load input power in S4 is: No-load input power P when there is no axial flow 0JZ Equal to the iron loss p generated by the operation of the experimental motor Fe 、Copper consumption 0CuJZ , mechanical loss p mec and medium friction loss p JZ the sum of P 0JZ =p Fe +p 0CuJZ +p mec +p JZ (4)。 6. The motor dielectric loss test method considering the stator and rotor ditching effect and axial flow according to claim 5 is characterized in that: The calculation method of the load input power in S5 is: Connect the experimental motor and the test model and place them in a container filled with medium. Under the condition of no axial flow, test the load input power of the experimental motor when it is loaded with different types of test models. Load input power P when there is no axial flow 1JZ Equal to the iron loss p generated by the operation of the experimental motor Fe 、Copper consumption 1CuJZ , mechanical loss p mec and medium friction loss p JZ Mechanical losses with test model load p mec and medium friction loss p xx The sum of the medium friction loss p xx is the medium friction loss that does not specify the test model type, when p xx For p gb When p is , it means that the load of the experimental motor is the test model with stator grooves and rotor without grooves; when p is xx For p bg When p is the load, it means the stator is not grooved and the rotor is grooved. xx For p gg When p is the load, it means the stator groove and rotor groove test model is used; when p is the load, it means the stator groove and rotor groove test model is used; xx For p bb When , it means the load is the test model with no stator grooves and no rotor grooves; P 1JZ =(p Fe +p 1CuJZ +p mec +p JZ )+(p mec +p xx ) (5)。 7. The motor dielectric loss test method considering the stator and rotor ditching effect and axial flow according to claim 6 is characterized in that: S6, through loss separation, obtains the medium friction loss when the stator and rotor are not grooved, the stator and rotor are grooved, the stator is grooved and the rotor is not grooved, and the stator is not grooved and the rotor is grooved under the working condition without axial flow, and analyzes the influence of the groove effect on the medium friction loss; The specific process is: According to the no-load input power P in the medium 0JZ and load input power P 1JZ The test results show that the test model loss P in the medium without axial flow is mx , P MX =P 1JZ -P 0JZ -p 1CuJZ +p 0CuJZ =p mec +p xx (6) According to the test model loss P in the medium without axial flow MX and mechanical loss p mec The calculation results can be used to obtain the medium friction loss p when there is no axial flow. xx , p xx =P MX -p mec (7) According to the medium friction loss p when there is no axial flow xx , the influence of the ditching effect on the friction loss of the medium under the condition of no axial flow can be obtained.

8. The motor dielectric loss test method considering the stator and rotor ditching effect and axial flow according to claim 5 is characterized in that: The calculation method of no-load input power in S7 is: No-load input power P when there is axial flow 0JZ1 Equal to the iron loss p generated by the operation of the experimental motor Fe 、Copper consumption 0CuJZ1 , mechanical loss p mec and medium friction loss p JZ1 the sum of P 0JZ1 =p Fe +p 0CuJZ1 +p mec +p JZ1 (9)。 9. The motor dielectric loss test method considering the stator and rotor ditching effect and axial flow according to claim 8, characterized in that: The load input power calculation method in S8 is: Load input power P when there is axial flow 1JZ1 Equal to the iron loss p generated by the operation of the experimental motor Fe 、Copper consumption 1CuJZ1 , mechanical loss p mec and medium friction loss p JZ1 Mechanical losses with test model load p mec and medium friction loss p xx1 the sum of P 1JZ1 =(p Fe +p 1CuJZ1 +p mec +p JZ )+(p xx1 +p mec ) (10)。 10. The motor dielectric loss test method considering the stator and rotor ditching effect and axial flow according to claim 9, characterized in that: S9, through loss separation, obtains the medium friction loss when the stator and rotor are not grooved, the stator and rotor are grooved, the stator is grooved and the rotor is not grooved, and the stator is not grooved and the rotor is grooved under the working conditions of axial flow, analyzes the influence of axial flow on the medium friction loss of the motor, and provides experimental data support for the design of the motor groove; The specific process is: According to the no-load input power P when there is axial flow 0JZ1 and load input power P 1JZ1 The test results show that the loss P of the test model in the presence of axial flow can be obtained. mx1 , P MX1 =P 1JZ1 -P 0JZ1 -p 1CuJZ1 +p 0CuJZ1 =p mec +p xx1 (11) According to the test model loss P in the presence of axial flow MX1 and mechanical loss p mec The calculation results can be used to obtain the medium friction loss p when there is axial flow. xx1 , p xx1 =P MX1 -p mec (12) According to the medium friction loss p when there is axial flow xx1 and the medium friction loss p when there is no axial flow xx , the effect of axial flow on medium friction loss can be obtained.

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