Shielded motor shielding sleeve loss and mechanical friction loss testing method

Abstract

The invention relates to a method for testing shielding sleeve loss and mechanical friction loss of a shielded motor, which comprises the following steps of: carrying out preset modification on the shielded motor to be tested, accessing a configured test system, and testing at a plurality of rotating speed points to be tested, obtaining test data of the input power, the phase current, the torque and the phase resistance at the rotating speed point to be tested, and recording and storing the test data; performing data processing on the test data of the refitted prototype at the rotating speed point to be tested; and obtaining the shielding sleeve loss and the mechanical friction loss of the to-be-tested shielding motor at the to-be-tested rotating speed point. The efficiency of the shield motor and the energy efficiency of the shield pump can be accurately improved, and the accuracy of actual measurement of shielding sleeve loss and mechanical friction loss is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of shielded pumps, and in particular relates to a method for testing shielding sleeve loss and mechanical friction loss of a shielded motor. Background Art

[0002] Now the canned motor has the characteristics of no leakage and high safety, and is widely used in life, industry and automobile fields. At present, the energy efficiency requirements for canned pumps are getting higher and higher, and high-efficiency canned pumps mostly use permanent magnet synchronous motors. The efficiency of permanent magnet canned motors is the core factor for canned pumps to achieve higher energy efficiency indicators. The actual loss research of permanent magnet canned motors is the only way to accurately improve the efficiency of canned motors. The loss of permanent magnet canned motors is composed of four parts: copper wire loss, core loss, shielding sleeve loss and mechanical friction loss. In the prior art, the shielding sleeve loss of permanent magnet canned motors is mainly obtained by simulation, and the shielding sleeve loss is affected by actual factors such as the fluctuation of the material properties of the shielding sleeve, the manufacturing process and the dimensional tolerance. The simulation method usually cannot consider the influence of these actual factors, so there may be a large difference between the simulation value and the actual value. The mechanical friction loss of permanent magnet canned motors includes bearing friction loss and the rotational friction loss between the rotor and the liquid medium. These loss data have not been verified by actual measurement, so the canned motor will have inaccurate motor efficiency simulation calculation results due to inaccurate loss data in the design stage, which is not conducive to accurately improving the efficiency of the canned motor. Since the mechanical friction loss is calculated through empirical formulas or empirical recommended values, and the mechanical friction loss of permanent magnet shielded motors is affected by actual factors such as rotor structure, assembly process, and medium viscosity, there may be a large difference between the empirical value and the actual value. In the prior art, there is a lack of relevant test methods that can measure the actual mechanical friction loss and shielding sleeve loss of shielded motors.

[0003] Therefore, it is necessary to improve the existing design and propose a test method that can accurately measure the shielding sleeve loss and mechanical friction loss of the shielded motor. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for testing the shielding sleeve loss and mechanical friction loss of a shielded motor, with all test data being stable and reliable. It can accurately improve the efficiency of the shielded motor and the energy efficiency of the shielded pump, and improve the accuracy of the actual measurement of the shielding sleeve loss and mechanical friction loss.

[0005] The present invention provides the following technical solutions:

[0006] A method for testing shielding sleeve loss and mechanical friction loss of a shielded motor comprises the following steps:

[0007] The canned motor to be tested is pre-modified and connected to the configured test system, and the test is performed at multiple speed points to be tested, and the test data of input power, phase current, torque and phase resistance at the speed points to be tested are obtained and recorded and saved;

[0008] Processing the test data of the modified prototype at the speed point to be tested;

[0009] The shielding sleeve loss and mechanical friction loss of the shielded motor to be tested at the speed point to be tested are obtained.

[0010] Optionally, the pre-configured modification of the canned motor to be tested and connected to a configured test system, and the testing at multiple speed points to be tested includes:

[0011] Under the first test system, test data of a first input power, a first phase current and a first phase resistance of a first test prototype at a rotation speed point to be tested are obtained;

[0012] Under the second test system, test data of a second input power, a first torque and a second phase resistance at a speed point to be tested of a second test sample are obtained;

[0013] Under the second test system, test data of a third input power, a second torque and a third phase resistance at a speed point to be tested of a third test prototype are obtained;

[0014] Under the third test system, the test data of the third torque of the fourth test sample at the speed point to be tested is obtained; and the test data of the first test sample, the second test sample, the third test sample and the fourth test sample are recorded and saved.

[0015] Optionally, the test data of the first input power, the first phase current and the first phase resistance of the first test prototype at the speed point to be tested includes: modifying the shielded motor to be tested into the first test prototype, selecting a constant room temperature, adjusting the test mode to be set to a motor operating parameter test mode, and driving the first test prototype to run and reach a constant speed operating state by setting the speed of the shielded pump controller to be tested of the shielded motor to be tested, recording the input power and phase current measured at this time, and recording the phase resistance measured by adjusting to the DC resistance test mode; repeating the test process to obtain the test data of the first input power, the first phase current and the first phase resistance of the first test prototype at the speed point to be tested and record and save them.

[0016] Optionally, the first test system includes: a line switcher, the line switcher is electrically connected to the three-phase power analyzer, the line switcher is connected to the DC resistance tester through a plurality of wires; the first test system is connected to the first test prototype;

[0017] The first test prototype includes: a canned pump motor test prototype and a canned pump controller to be tested, and a line switch and a three-phase power analyzer are connected between the canned pump controller to be tested and the canned pump motor test prototype.

[0018] Optionally, obtaining test data of a second input power, a first torque, and a second phase resistance of the second test sample at a speed point to be tested includes:

[0019] The first test prototype is converted into the second test prototype, and a constant room temperature is selected. The test mode is adjusted to the motor operation parameter test mode, and the speed is set by the controller of the shielded motor to be tested. The shielded pump controller of the shielded motor to be tested drives the second test prototype to run at a constant speed and drag the servo motor, and the output torque is adjusted to make the phase current of the second test prototype equal to the phase current of the first test prototype. When the constant speed operation state is reached, the second input power value and the first torque are recorded, and the second phase resistance measured by adjusting to the DC resistance test mode is recorded; the test process is repeated to obtain the test data of the second input power, the first torque and the second phase resistance of the second test prototype at the speed point to be tested and record and save them.

[0020] Optionally, the second test system includes: a circuit switcher and a servo motor and a control system thereof, the circuit switcher is electrically connected to a three-phase power analyzer, the circuit switcher is connected to a DC resistance tester through a plurality of wires, and the servo motor and its control system are sequentially connected to a torque meter and a second test prototype through a coupling;

[0021] The second test prototype includes: a canned pump motor test prototype and a canned pump controller to be tested, a line switch and a three-phase power analyzer are connected between the canned pump controller to be tested and the canned pump motor test prototype, and the canned pump motor test prototype is connected to a torque meter.

[0022] Optionally, the test data of the third input power, the second torque and the third phase resistance of the third test prototype at the speed point to be tested includes: modifying the second test prototype into the third test prototype, selecting a constant room temperature, adjusting the test mode to be set to a motor operating parameter test mode, using the controller of the shielded pump to be tested of the shielded motor to be tested to set the speed to drive the third test prototype to operate, and adjusting the output torque so that the phase current of the third test prototype is equal to the phase current of the first test prototype to achieve a constant speed operation state, recording the third input power and the second torque measured at this time, and recording the third phase resistance measured by adjusting to the DC resistance test mode; repeating the test process to obtain the test data of the third input power, the second torque and the third phase resistance of the third test prototype at the speed point to be tested and record and save them.

[0023] Optionally, obtaining the test data of the third torque of the fourth test sample at the speed point to be tested includes:

[0024] The third test prototype is modified into the fourth test prototype, and a constant room temperature is selected. The fourth test prototype is not powered on, and the servo motor of the third test system and its control system are set to rotate at a speed to drag the fourth test prototype, and the third torque measured at this time is recorded; the test process is repeated to obtain the third torque data of the fourth test prototype at the speed point to be tested and record and save it.

[0025] Optionally, the third test system includes: a servo motor and a control system thereof, wherein the servo motor and the control system are sequentially connected to the torque meter and the fourth test prototype through a coupling; the fourth test prototype includes: an assembled non-magnetized rotor assembly.

[0026] Optionally, the shielding sleeve loss and mechanical friction loss of the shielded motor to be tested at the speed point to be tested are obtained as follows:

[0027] The shielding sleeve loss is the input power of the second test sample - the input power of the third test sample + the power of the difference between the phase resistance of the third test sample and the second test sample + the shaft power under different states.

[0028] The mechanical friction loss is the input power of the first test sample minus the input power of the second test sample plus the power of the difference between the phase resistances of the first test sample and the second test sample plus the shaft power under different states.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The data collected during the test of this invention are all measured data. The calculation formulas for shielding sleeve loss and mechanical friction loss are obtained based on the measured data of the shielded pump prototype. More accurate data is obtained through simulation, empirical formula, and a combination of simulation and testing, which can accurately improve the efficiency of shielded motors and shielded pumps.

[0031] Three test systems, each test system's test prototype uses the same canned motor's stator and rotor components, and is tested at the same ambient temperature and reaches a constant speed stable state, which improves the stability and reliability of all test data. It can accurately improve the canned motor efficiency and canned pump energy efficiency. It also improves the accuracy of the actual measurement of the canned sleeve loss and mechanical friction loss.

[0032] During the test, the phase resistance is collected separately for each measurement, making the calculation of the actual copper wire loss more accurate. By maintaining the same ambient temperature, speed and phase current for each measurement, the actual core loss can remain unchanged for each measurement, thereby improving the accuracy of the actual measurement of the shielding sleeve loss and mechanical friction loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1A schematic flow chart of a method for testing shielding sleeve loss and mechanical friction loss of a shielded motor provided in an embodiment of the present invention;

[0034] Figure 2 It is a flow chart of a method for testing shielding sleeve loss and mechanical friction loss of a shielded motor provided by an embodiment of the present invention;

[0035] Figure 3 This is a first test system framework diagram of a method for testing shielding sleeve loss and mechanical friction loss of a shielded motor provided by an embodiment of the present invention;

[0036] Figure 4 It is a second test system framework diagram of the shielding sleeve loss and mechanical friction loss test method of the shielded motor provided by the embodiment of the present invention;

[0037] Figure 5 It is a third test system framework diagram of the shielded motor shielding sleeve loss and mechanical friction loss test method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0039] Example

[0040] like Figure 2 As shown, the present invention provides a method for testing the shielding sleeve loss and mechanical friction loss of a shielded motor, comprising the following steps:

[0041] like Figure 1 As shown, S11, according to the property index of the canned motor to be tested, the maximum speed of the canned motor to be tested is obtained;

[0042] This attribute indicator is the shielded pump nameplate, specification and / or pump design parameters, and its function is to determine the maximum speed point that needs to be measured.

[0043] S12, pre-modifying the canned motor to be tested and connecting it to the configured test system, testing it at multiple speed points to be tested, obtaining the test data of input power, phase current, torque and phase resistance at the speed points to be tested and recording and saving them;

[0044] S13, processing the test data of the modified prototype at the speed point to be tested;

[0045] S14, obtaining the shielding sleeve loss and mechanical friction loss of the shielded motor to be tested at the speed point to be tested.

[0046] Optionally, the pre-configured modification of the canned motor to be tested and connected to a configured test system, and the testing at multiple speed points to be tested includes:

[0047] Under the first test system, test data of a first input power, a first phase current and a first phase resistance of a first test prototype at a rotation speed point to be tested are obtained;

[0048] Under the second test system, test data of a second input power, a first torque and a second phase resistance at a speed point to be tested of a second test sample are obtained;

[0049] Under the second test system, test data of a third input power, a second torque and a third phase resistance at a speed point to be tested of a third test prototype are obtained;

[0050] Under the third test system, the test data of the third torque of the fourth test sample at the speed point to be tested is obtained; and the test data of the first test sample, the second test sample, the third test sample and the fourth test sample are recorded and saved.

[0051] Optionally, the test data of the first input power, the first phase current and the first phase resistance of the first test prototype at the speed point to be tested includes: modifying the shielded motor to be tested into the first test prototype, selecting a constant room temperature, adjusting the test mode to be set to the motor operating parameter test mode, setting the speed of the shielded pump controller to be tested of the shielded motor to be tested to drive the first test prototype to operate and reach a constant speed operation state, recording the input power and phase current measured at this time, and recording the phase resistance measured by adjusting to the DC resistance test mode; repeating the test process to obtain the first input power P1_k, the first phase current I_k and the first phase resistance R1_k test data of the first test prototype at different speed points n_k to be tested and record and save them; wherein k=1,2,3…,max, k takes values ​​from small to large, and the speed value of the speed point n_k to be tested also increases successively, and when k takes max, the speed value of the speed point to be tested is less than or equal to the maximum speed marked by the shielded motor to be tested.

[0052] Optional, such as Figure 3 As shown, the first test system includes: a line switcher, the line switcher is electrically connected to the three-phase power analyzer, and the line switcher is connected to the DC resistance tester through a number of wires; the first test system is connected to the first test prototype;

[0053] The first test prototype includes: a canned motor pump test prototype and a canned pump controller to be tested, wherein a line switch and a three-phase power analyzer are connected between the canned pump controller to be tested and the canned motor pump test prototype. The line switch is provided with a switchable DC resistance test mode and a motor operation parameter test mode, and the motor operation parameter test mode can test the input power and phase current value of the canned motor at different speeds.

[0054] Modifying the first test prototype includes: removing the rotor assembly and impeller of the canned pump to be tested and reassembling them, blocking the water outlet of the canned pump, filling the water inlet with liquid medium, blocking the water inlet of the canned pump, and separating the controller of the canned pump to be tested from the canned motor.

[0055] Optionally, obtaining test data of a second input power, a first torque, and a second phase resistance of the second test sample at a speed point to be tested includes:

[0056] The first test prototype is converted into the second test prototype, a constant room temperature is selected, the test mode is adjusted to the motor operation parameter test mode, the speed is set by the controller of the shielded pump of the shielded motor to be tested to drive the second test prototype to run at a constant speed and drag the servo motor to reach a constant speed stable operation state, and the output torque is adjusted to make the phase current of the second test prototype equal to the phase current I_k of the first test prototype. When the constant speed operation state is reached, the second input power value P2_k and the first torque T1_k of the torque meter are recorded, and the second phase resistance R2_k measured by adjusting to the DC resistance test mode is recorded; the test process is repeated to obtain the second input power P2_k, the first torque T1_k and the second phase resistance R2_k test data measured by the DC resistance tester at different speed points n_k to be tested of the second test prototype and record and save them, wherein k=1,2,3…,max, the speed k is set to take values ​​from small to large, and the speed value of the speed point n_k to be tested also increases in sequence. When k takes max, the speed value of the speed point to be tested is less than or equal to the maximum speed marked by the shielded motor to be tested.

[0057] like Figure 4 As shown, the second test system includes: a line switcher and a servo motor and its control system, the line switcher is electrically connected to a three-phase power analyzer, the line switcher is connected to a DC resistance tester through a number of wires, and the line switcher is connected to a DC resistance tester through a number of wires; the servo motor and its control system are sequentially connected to a torque meter and a second test prototype through a coupling; the second test prototype includes: a canned pump motor test prototype and a canned pump controller to be tested, a line switcher and a three-phase power analyzer are connected between the canned pump controller to be tested and the canned pump motor test prototype, and the canned pump motor test prototype is connected to a torque meter. The line switcher operates with a switchable DC resistance test mode and a motor operation parameter test mode, and the motor operation parameter test mode tests the input power and torque values ​​of the canned motor at different speeds.

[0058] Modifying the second test prototype includes: removing the stator assembly, rotor assembly and straight-cylindrical stator shield sleeve of the first test prototype, and installing a ball bearing type motor structure assembly on the first test prototype, the ball bearing type motor structure assembly including a base, a bearing seat, a ball bearing and a wave washer.

[0059] Optionally, the test data of the third input power, the second torque and the third phase resistance of the third test prototype at the speed point to be tested includes: modifying the second test prototype into the third test prototype, selecting a constant room temperature, adjusting the test mode to be set to the motor operation parameter test mode, setting the speed of the tested shielded pump controller of the different shielded motors to be tested to drive the third test prototype to operate at a constant speed, and adjusting the output torque so that the phase current of the third test prototype is equal to the phase current I_k of the first test prototype. When the constant speed operation state is reached, the third input power value P3_k and the second torque T2_k measured at this time are recorded, and the third phase resistance R3_k measured when the DC resistance test mode is adjusted is recorded; repeating the test process, obtaining the third input power P3_k, the second torque T2_k and the third phase resistance data of the third test prototype at different speed points to be tested and recording and saving them, wherein k=1,2,3…,max, the speed k is set to take values ​​from small to large in sequence, and the speed value of the speed point n_k to be tested also increases in sequence. When k takes max, the speed value of the speed point to be tested is less than or equal to the maximum speed marked by the shielded motor to be tested.

[0060] The modification of the second test prototype to the third test prototype includes taking out the straight-cylindrical stator shielding sleeve of the second test prototype, and connecting the third test prototype to the second test system.

[0061] Optionally, obtaining the test data of the third torque of the fourth test sample at the speed point to be tested includes:

[0062] The third test prototype is modified into the fourth test prototype, and a constant room temperature is selected. The fourth test prototype is not powered on, and the servo motor of the third test system and its control system are set to drag the fourth test prototype to rotate at a constant speed, and the third torque value T3_k is recorded; the test process is repeated to obtain the third torque T3_k data of the fourth test prototype rotating at different speed points to be tested and record and save it, where k = 1, 2, 3..., max, the servo motor speed k takes values ​​from small to large, and the speed value of the speed point n_k to be tested also increases successively. When k takes max, the speed value of the speed point to be tested is less than or equal to the maximum speed marked by the shielded motor to be tested.

[0063] Optional, such as Figure 5 As shown, the fourth test prototype includes: replacing the rotor assembly of the third test prototype with a non-magnetized rotor assembly, and the fourth test prototype is connected to the third test system.

[0064] The third test system includes a servo motor and a control system thereof, which are sequentially connected to the torque measuring instrument and the fourth test prototype through a coupling. The servo motor is set to drive the canned motor motor test prototype to rotate at different speeds, and the servo motor is required to provide a third torque value T3_k when the canned motor to be tested rotates at different speeds.

[0065] Optionally, the shielding sleeve loss and mechanical friction loss of the shielded motor to be tested at the speed point to be tested are obtained:

[0066] The calculation formula is used to process the test data collected from all test samples at different speeds as follows:

[0067] In the S3 process, the copper wire loss, core loss, shielding sleeve loss and mechanical friction loss of the first test sample are assumed to be P1_cu, P1_Fe, P_w and P_e respectively. Then the following relationship exists:

[0068] Relationship ①: P1_k=P1_cu+P1_Fe+P_w+P_e

[0069] Relationship ②: P1_cu=3·I_k·I_k·R1_k;

[0070] In the process of S5, the copper wire loss, core loss, shielding sleeve loss and mechanical friction loss of the second test sample are assumed to be P2_cu, P2_Fe, P2_w and P2_e respectively. Then the following relationship exists:

[0071] Relationship ③: P2_k=P2_cu+P2_Fe+P2_w+P2_e+n_k·T1_k / 9.55

[0072] Relationship ④: P2_cu=3·I_k·I_k·R2_k;

[0073] In S7, the copper wire loss, core loss and mechanical friction loss of the third test sample are assumed to be P3_cu, P3_Fe and P3_e respectively. Then the following relationship exists:

[0074] Relationship ⑤: P3_k=P3_cu+P3_Fe+P3_e+n_k·T2_k / 9.55

[0075] Relationship ⑥: P3_cu=3·I_k·I_k·R3_k;

[0076] In the process S9, the mechanical friction loss of the fourth test sample is assumed to be P4_e. Then the following relationship exists:

[0077] Relationship ⑦: P4_e = n_k·T3_k / 9.55, the shaft power calculation formula under different conditions is n_k·T1_k / 9.55, n_k·T2_k / 9.55, n_k·T3_k / 9.55;

[0078] Since the first test sample, the second test sample and the third test sample use the same motor stator and rotor components and have the same ambient temperature, the same speed n_k and the same armature current I_k, the following relationship exists:

[0079] Relationship ⑧: P1_Fe=P2_Fe=P3_Fe

[0080] Relationship 9: P_w=P2_w;

[0081] Since the second test sample, the third test sample and the fourth test sample all use ball bearing type motor structural components and have the same ambient temperature and the same speed n_k, the following relationship exists:

[0082] Relationship ⑩: P2_e=P3_e=P4_e;

[0083] By combining equations ① to ⑩, we can obtain the calculation formulas for shield sleeve loss P_w and mechanical friction loss P_e at n_k speed when the shielded pump motor is actually working in the medium environment, as follows:

[0084] The shielding sleeve loss P_w is the input power P2_k of the second test sample - the input power P3_k of the third test sample + the power of the difference between the phase resistance of the third test sample and the second test sample 3·I_k·I_k·(R3_k-R2_k) + the shaft power n_k·(T2_k-T1_k) / 9.55 under different states,

[0085] P_w=P2_k-P3_k+3·I_k·I_k·(R3_k-R2_k)+n_k·(T2_k-T1_k) / 9.55

[0086] Among them, at the speed point n_k to be tested, the difference between the second torque T2_k measured by the third test sample and the first torque T1_k measured by the second test sample is the shaft power at this time.

[0087] The mechanical friction loss P_e is the input power P1_k of the first test sample - the input power P2_k of the second test sample + the power of the difference between the phase resistance of the second test sample and the first test sample 3·I_k·I_k·(R2_k-R1_k)+ the shaft power n_k·(T1_k+T3_k) / 9.55 under different states,

[0088] P_e=P1_k-P2_k+3·I_k·I_k·(R2_k-R1_k)+n_k·(T1_k+T3_k) / 9.55,

[0089] Among them, at the speed point n_k to be tested, the sum of the first torque T1_k measured by the second test prototype and the third torque T3_k measured by the fourth test prototype is the shaft power at this time.

[0090] Substituting the test data at different speeds into the above calculation formula can obtain the shielding sleeve loss P_w and mechanical friction loss P_e values ​​at different speeds under the Tem temperature of the shielded pump motor, where the Tem temperature can be in the range of 0℃ to 40℃.

[0091] Embodiment: The 350W permanent magnet canned pump motor was tested according to implementation mode one to obtain the test data in Table 1, and the shielding sleeve loss P_w and mechanical friction loss P_e were calculated according to the calculation formula to obtain the actual measured values ​​of the shielding sleeve loss and mechanical friction loss corresponding to the speeds of 4000rpm, 5000rpm, 6000rpm and 7000rpm of the 350W canned motor at a constant temperature of 25°C.

[0092] Table 1

[0093]

[0094] Implementation method two: Considering that the time required for the S3, S5 and S7 test samples in the above test steps to reach a constant speed stable operation state is relatively short, the phase resistance changes slightly during this period and the value of I_k itself is small, it can be approximately considered that the copper wire loss in the S3, S5 and S7 processes is the same, that is, P1_cu=P2_cu=P3_cu. Therefore, the phase resistance measurement can be omitted in the above test steps S3, S5, and S7 processes (that is, the process of "immediately recording the phase resistance tested by the DC resistance tester after adjusting the line switcher to the DC resistance test mode" is omitted), thereby simplifying the test process. This method is used to obtain the calculation formulas for the shielding sleeve loss P_w and mechanical friction loss P_e at the speed n_k during the actual operation of the shielded pump motor in the medium environment, as follows:

[0095] P_w=P2_k-P3_k+n_k·(T2_k-T1_k) / 9.55

[0096] P_e=P1_k-P2_k+n_k·(T1_k+T3_k) / 9.55

[0097] Substituting the test data at different speeds into the above calculation formula can obtain the shielding sleeve loss P_w and mechanical friction loss P_e values ​​at different speeds under the Tem temperature of the shielded pump motor, where the Tem temperature can be in the range of 0℃ to 40℃.

[0098] Embodiment: The 350W permanent magnet canned pump motor was tested according to implementation mode 2 to obtain the test data in Table 2 below, and the shielding sleeve loss P_w and mechanical friction loss P_e were calculated according to the calculation formula to obtain the actual measured values ​​of the shielding sleeve loss and mechanical friction loss corresponding to 4000rpm, 5000rpm, 6000rpm and 7000rpm of the 350W canned motor at a constant temperature of 25°C.

[0099] Table 2

[0100]

[0101] The test method proposed in the present invention can make the calculation of actual copper wire loss more accurate by separately collecting phase resistance in each measurement during the test process, and can keep the same ambient temperature, rotation speed and phase current in each measurement so that the actual core loss can remain unchanged in each measurement, thereby improving the accuracy of the actual measurement of shielding sleeve loss and mechanical friction loss.

[0102] In the description of this specification, the description with reference to the terms "in one embodiment", "in another embodiment", "exemplary" or "in a specific embodiment" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0103] Although the present invention has been described in detail above by means of general description, specific implementation methods and tests, it is obvious to those skilled in the art that some modifications or improvements may be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A test method for shielding sleeve loss and mechanical friction loss of shielded motors. It is characterized in that include: The canned motor to be tested is pre-modified and connected to the configured test system, and the test is performed at multiple speed points to be tested, and the test data of input power, phase current, torque and phase resistance at the speed points to be tested are obtained and recorded and saved; Processing the test data of the modified prototype at the speed point to be tested; The shielding sleeve loss and mechanical friction loss of the shielded motor to be tested at the speed point to be tested are obtained.

2. The method according to claim 1, It is characterized in that The pre-configured and configured test system is connected to the canned motor to be tested, and the test is performed at multiple speed points to be tested, including: Under the first test system, test data of a first input power, a first phase current and a first phase resistance of a first test prototype at a rotation speed point to be tested are obtained; Under the second test system, test data of a second input power, a first torque and a second phase resistance at a speed point to be tested of a second test sample are obtained; Under the second test system, test data of a third input power, a second torque and a third phase resistance at a speed point to be tested of a third test prototype are obtained; Under the third test system, the test data of the third torque of the fourth test sample at the speed point to be tested is obtained; and the test data of the first test sample, the second test sample, the third test sample and the fourth test sample are recorded and saved.

3. The method according to claim 2, It is characterized in that The method for obtaining the test data of the first input power, the first phase current and the first phase resistance of the first test prototype at the speed point to be tested includes: modifying the shielded motor to be tested into the first test prototype, selecting a constant room temperature, adjusting the test mode to be set to a motor operation parameter test mode, using the shielded pump controller to be tested of the shielded motor to be tested to set the speed to drive the first test prototype to operate and reach a constant speed operation state, recording the input power and phase current measured at this time, and recording the phase resistance measured by adjusting to the DC resistance test mode; repeating the test process to obtain the test data of the first input power, the first phase current and the first phase resistance of the first test prototype at the speed point to be tested and record and save them.

4. The method according to claim 2, It is characterized in that The first test system comprises: a line switcher, the line switcher is electrically connected to the three-phase power analyzer, the line switcher is connected to the DC resistance tester through a plurality of wires; the first test system is connected to the first test prototype; The first test prototype includes: a canned pump motor test prototype and a canned pump controller to be tested, and a line switch and a three-phase power analyzer are connected between the canned pump controller to be tested and the canned pump motor test prototype.

5. The method according to claim 2, It is characterized in that The obtaining of the test data of the second input power, the first torque and the second phase resistance at the speed point to be tested of the second test sample comprises: The first test prototype is converted into the second test prototype, and a constant room temperature is selected. The test mode is adjusted to the motor operation parameter test mode, and the speed is set by the controller of the shielded motor to be tested. The shielded pump controller of the shielded motor to be tested drives the second test prototype to run at a constant speed and drag the servo motor, and the output torque is adjusted to make the phase current of the second test prototype equal to the phase current of the first test prototype. When the constant speed operation state is reached, the second input power value and the first torque are recorded, and the second phase resistance measured by adjusting to the DC resistance test mode is recorded; the test process is repeated to obtain the test data of the second input power, the first torque and the second phase resistance of the second test prototype at the speed point to be tested and record and save them.

6. The method according to claim 2, It is characterized in that The second test system includes: a line switcher and a servo motor and a control system thereof, wherein the line switcher is electrically connected to a three-phase power analyzer, the line switcher is connected to a DC resistance tester through a plurality of wires, and the servo motor and its control system are sequentially connected to a torque measuring instrument and a second test prototype through a coupling; The second test prototype includes: a canned pump motor test prototype and a canned pump controller to be tested, a line switch and a three-phase power analyzer are connected between the canned pump controller to be tested and the canned pump motor test prototype, and the canned pump motor test prototype is connected to a torque meter.

7. The method according to claim 2, It is characterized in that The method for obtaining the test data of the third input power, the second torque and the third phase resistance of the third test prototype at the speed point to be tested includes: modifying the second test prototype into the third test prototype, selecting a constant room temperature, adjusting the test mode to be set to a motor operation parameter test mode, driving the third test prototype to operate with the speed set by the controller of the shielded motor to be tested, and adjusting the output torque so that the phase current of the third test prototype is equal to the phase current of the first test prototype to achieve a constant speed operation state, recording the third input power and the second torque measured at this time, and recording the third phase resistance measured by adjusting to the DC resistance test mode; repeating the test process to obtain the test data of the third input power, the second torque and the third phase resistance of the third test prototype at the speed point to be tested and record and save them.

8. The method according to claim 2, It is characterized in that The step of obtaining the test data of the third torque at the speed point to be tested of the fourth test sample includes: The third test prototype is modified into the fourth test prototype, and a constant room temperature is selected. The fourth test prototype is not powered on, and the servo motor of the third test system and its control system are set to rotate at a speed to drag the fourth test prototype, and the third torque measured at this time is recorded; the test process is repeated to obtain the third torque data of the fourth test prototype at the speed point to be tested and record and save it.

9. The method according to claim 2, It is characterized in that The third test system includes: a servo motor and a control system thereof, which are sequentially connected to a torque meter and a fourth test prototype through a coupling; the fourth test prototype includes: an assembled non-magnetized rotor assembly.

10. The method according to claim 1, It is characterized in that The shielding sleeve loss and mechanical friction loss of the shielded motor to be tested at the speed point to be tested are obtained as follows: The shielding sleeve loss is the input power of the second test sample - the input power of the third test sample + the power of the difference between the phase resistance of the third test sample and the second test sample + the shaft power under different states. The mechanical friction loss is the input power of the first test sample minus the input power of the second test sample plus the power of the difference between the phase resistances of the first test sample and the second test sample plus the shaft power under different states.

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