Rotor oil friction loss measuring device and oil-immersed motor rotor oil friction loss separation method

Abstract

The rotor oil friction loss measuring device and the oil-immersed motor rotor oil friction loss separation method belong to the field of electric machines. The simulation rotor is mounted in a casing, two bearings are fixedly assembled in two end covers, a rotor shaft is coaxially assembled with the two bearings, an area surrounded by the simulation rotor, the casing, the two end covers and the two bearings is an oil domain area, a contact part of the simulation rotor and the oil domain area includes an outer cylindrical surface of a rotor cylinder, two side end surfaces of the rotor cylinder and a shaft neck surface of the rotor shaft, and one end of the rotor shaft is in transmission connection with an output shaft of a driving motor through a coupling. The driving motor is used as a dragging device to drag the simulation rotor to a corresponding rotating speed, and active power input when the driving motor drives different structure simulation rotors is measured respectively. Oil friction loss changes caused by structure differences of the simulation rotor can be calculated according to a difference value of the motor input power, and further, oil friction losses of each part of the simulation rotor can be compared and separated according to different structure differences. The present application is used for separating oil friction losses of oil-immersed motor rotors.

Description

Technical Field

[0001] This invention belongs to the field of electric motors, and specifically relates to a method for separating oil friction loss of an oil-immersed motor rotor. Background Technology

[0002] Extreme exploration equipment such as deep-earth logging-while-drilling systems and manned submersible propulsion systems rely on motor systems for power output. However, since these devices operate directly in high-pressure environments, the motors must be filled with oil to prevent damage from external pressure. Unlike conventional motors without internal filling media, oil-immersed motors generate significant oil friction losses in addition to copper and iron losses. Increased oil friction losses significantly affect the temperature changes of motors in extreme environments, thus impacting their operating condition and lifespan. Although methods exist to suppress losses in oil-immersed motors, the specific values ​​of losses in each component remain unclear. In particular, oil friction losses, as a type of fluid loss, present significant challenges in calculation and testing. Accurately separating the magnitude of oil friction losses in different parts of the motor rotor structure has become crucial for optimizing the design of oil-immersed motors and improving their performance. Summary of the Invention

[0003] The purpose of this invention is to solve the problem that there is currently no method for separating oil friction loss of the rotor in an oil-immersed motor, and it is impossible to accurately measure the magnitude of oil friction loss in different parts of the motor rotor. This invention proposes a rotor oil friction loss measuring device and a method for separating oil friction loss of the rotor in an oil-immersed motor.

[0004] The method of the present invention can not only measure the magnitude of oil friction loss of motor rotor, but also separate the oil friction loss of various parts such as the outer cylindrical surface of rotor cylinder, the two end faces of rotor cylinder, the journal face of rotor shaft, and bearings.

[0005] The measurement component simulates the working environment of the motor rotor while avoiding oil temperature rise variations caused by other motor losses. The drive motor acts as a dragging device, moving the simulated rotor to the corresponding speed, and the active power input when the drive motor drives simulated rotors with different structures is measured. The drive motor and the simulated rotor are coaxially connected via a coupling. The change in oil friction loss caused by the structural differences of the simulated rotor can be calculated from the difference in motor input power (difference in active power). Furthermore, based on the different structural differences, the magnitude of oil friction loss in each part of the simulated rotor can be compared and separated.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] The rotor oil friction loss measuring device of the present invention includes a measuring component, a coupling, and a drive motor. The measuring component includes a housing, a simulated rotor, two end covers, and two bearings. The simulated rotor consists of a rotor shaft and a rotor column. The rotor column is fixedly mounted on the rotor shaft. The two end covers are detachably and sealed at both ends of the housing. The simulated rotor is installed inside the housing. The two bearings are respectively fixedly assembled in the center holes of the corresponding end covers. The rotor shaft and the two bearings are coaxially assembled. The area enclosed by the simulated rotor, the housing, the two end covers, and the two bearings is the oil zone. The part of the simulated rotor in contact with the oil zone includes the outer cylindrical surface of the rotor column, the two end faces of the rotor column, and the journal face of the rotor shaft. One end of the rotor shaft is connected to the output shaft of the drive motor via a coupling.

[0008] The method for separating oil friction loss of an oil-immersed motor rotor according to the present invention simulates rotor oil friction loss including the loss of the outer cylindrical surface of the rotor cylinder, the loss of the two end faces of the rotor cylinder, the loss of the rotor shaft journal surface, and the bearing loss, which are respectively represented by P. C P S P R P B This indicates that the loss coefficient per unit outer cylindrical surface of the rotor cylinder and the loss coefficient per unit journal surface of the rotor shaft are defined as k. C k R The oil friction loss of the simulated rotor is separated using a rotor oil friction loss measuring device. The separation method includes the following steps:

[0009] Step 1: Denote the simulated rotor as Structure 1, with the length of the outer cylindrical surface of the rotor cylinder being l. C The length of the rotor shaft journal is l R At this time, the outer cylindrical surface of the rotor cylinder and the journal surface of the rotor shaft have not changed, Δl0=0; Assemble the simulated rotor of structure one according to the measurement component structure. After assembly, connect one end of the simulated rotor of structure one to the output shaft of the drive motor through a coupling, and drive the simulated rotor of structure one to the rated speed through the drive motor. Measure the active power input to the drive motor with a power analyzer and record it as P0.

[0010] Step 2: Reduce the length of the outer cylindrical surface of the rotor cylinder of the simulated rotor in Step 1 by Δl1, and denote the new structure as Structure 2. Assemble the simulated rotor of Structure 2 according to the measurement component structure. After assembly, connect one end of the simulated rotor of Structure 2 to the output shaft of the drive motor through a coupling, and drive the simulated rotor of Structure 2 to the rated speed through the drive motor. Measure the active power input to the drive motor with a power analyzer and denote it as P1.

[0011] Step 3: Reduce the length of the outer cylindrical surface of the rotor cylinder of the simulated rotor in Step 1 by Δl2, and denote the new structure as Structure 3. Assemble the simulated rotor of Structure 3 according to the measurement component structure. After assembly, connect one end of the simulated rotor of Structure 3 to the output shaft of the drive motor through a coupling, and drive the simulated rotor of Structure 3 to the rated speed through the drive motor. Measure the active power input to the drive motor with a power analyzer and denote it as P2.

[0012] Step 4: In the three measurements from Steps 1 to 3 above, only the lengths of the outer cylindrical surface of the rotor cylinder and the journal surface of the rotor shaft changed, and the sum of the changes was 0. Therefore, the change in the input active power of the drive motor caused by the change in rotor structure is simulated by the loss coefficient k per unit outer cylindrical surface of the rotor cylinder. C and rotor shaft unit journal surface loss coefficient k R It is expressed as follows:

[0013]

[0014] In equation (1), △P 10 This represents the difference in active power measured between Structure 2 and Structure 1; ΔP 20 This represents the difference in active power measured between Structure 3 and Structure 1;

[0015] The loss coefficient k per unit outer cylindrical surface of the rotor cylinder can be calculated using equation (1). C and rotor shaft unit journal surface loss coefficient k R k C and k R The oil friction loss on the outer cylindrical surface of the rotor cylinder and the oil friction loss on the journal surface of the rotor shaft can be obtained by multiplying them by the lengths of the outer cylindrical surface of the rotor cylinder and the journal surface of the rotor shaft, respectively.

[0016] Step 5: Measure the length l of the outer cylindrical surface of the simulated rotor cylinder from Step 1. C Decrease Δl3, and Δl3 = l C Only the rotor shaft is saved and the new structure is designated as Structure 4. The simulated rotor of Structure 4 is assembled according to the measurement component structure. After assembly, one end of the simulated rotor of Structure 4 is connected to the output shaft of the drive motor through a coupling. The simulated rotor is then dragged to the rated speed by the drive motor. The active power input to the drive motor is measured using a power analyzer and designated as P3.

[0017] Step Six: The difference between the active power measured in Step One and Step Five is expressed as follows:

[0018] ΔP 03 =P0-P3=P S +k C Δl3-k R Δl3 (2)

[0019] In equation (2), P s The length l of the outer cylindrical surface of the rotor cylinder is indicated. C After being reduced to 0, the change in oil wear loss on both ends of the rotor column due to the disappearance of the two ends of the rotor column is the oil wear loss on both ends of the rotor column.

[0020] Step 7: Calculate the loss coefficient k per unit outer cylindrical surface of the rotor cylinder based on the result obtained in Step 4. C and rotor shaft unit journal surface loss coefficient k R And the oil friction loss P on both ends of the rotor cylinder obtained in step six. S If the bearing loss is solved by selecting a simulated rotor from any of the four structures (structure 1 to structure 4), then the bearing oil friction loss P is... B Represented as:

[0021] P B =P N -k C (l C -Δl N )-k R (l R +Δl N )-P S (3)

[0022] In equation (3), N is selected as 0, 1, 2 or 3;

[0023] Step 8: Change the speed of drive motor 3. By executing steps one to seven above, we can obtain the relationship between the outer cylindrical surface of the rotor cylinder, the two end faces of the rotor cylinder, the journal surface of the rotor shaft, and the bearing oil friction loss and the speed.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. The designed rotor oil friction loss measuring device solves the problems of difficult measurement of motor rotor oil friction loss and difficulty in separating the magnitude of oil friction loss of different parts of the rotor. It is also simple to operate and easy to implement.

[0026] 2. The conclusions drawn from the proposed rotor oil friction loss separation method can effectively verify the rationality and accuracy of the relevant oil friction loss algorithm;

[0027] 3. By separating the oil friction losses of different parts of the motor rotor using this method, the influence of different parts of the motor rotor structure on the oil friction losses can be clearly identified, providing relevant data references for planning the oil friction loss distribution of the rotor and optimizing motor performance. Attached Figure Description

[0028] Figure 1 This is a main sectional view of the rotor oil friction loss measuring device of the present invention;

[0029] Figure 2 This is a front sectional view of the measuring component of the present invention.

[0030] The component names and reference numerals in the above figures are as follows:

[0031] Measurement component 1, housing 1-1, simulated rotor 1-2, rotor shaft 1-2-1, rotor column 1-2-2, end cover 1-3, bearing 1-4, outer cylindrical surface of rotor column 1-5, two end faces of rotor column 1-6, rotor shaft journal face 1-7, coupling 2, drive motor 3, oil zone 4. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] Specific implementation method one: as follows Figures 1-2 As shown, this embodiment discloses a rotor oil friction loss measuring device, including a measuring component 1, a coupling 2, and a drive motor 3. The measuring component 1 includes a housing 1-1, a simulated rotor 1-2 (with the same size as the actual motor rotor under test), two end covers 1-3, and two bearings 1-4. The simulated rotor 1-2 consists of a rotor shaft 1-2-1 and a rotor column 1-2-2. The rotor column 1-2-2 is fixedly mounted on the rotor shaft 1-2-1. The two end covers 1-3 are detachably and sealed at both ends of the housing 1-1 (using screws and gaskets) to ensure good sealing by filling the measuring component 1 with oil. The simulated rotor 1-2 is installed inside the housing 1-1. The two bearings 1-4... -4 are fixedly assembled in the center holes of the corresponding end caps 1-3. The rotor shaft 1-2-1 is coaxially assembled with the two bearings 1-4. The area enclosed by the simulated rotor 1-2, the housing 1-1, the two end caps 1-3 and the two bearings 1-4 is the oil zone 4 (the oil zone 4 is filled with oil, and the oil filling space of the oil zone 4 is consistent with the actual motor under test). The part of the simulated rotor 1-2 in contact with the oil zone 4 includes the outer cylindrical surface 1-5 of the rotor cylinder, the two end faces 1-6 of the rotor cylinder and the journal face 1-7 of the rotor shaft. One end of the rotor shaft 1-2-1 is connected to the output shaft of the drive motor 3 through the coupling 2 (the coupling 2 and the drive motor 3 are coaxial with the simulated rotor 1-2).

[0034] The gap between the simulated rotor 1-2 and the housing 1-1 is determined according to the actual gap size of the motor being tested.

[0035] Specific implementation method two: such as Figure 1 , Figure 2As shown, this embodiment is a method for separating the oil friction loss of an oil-immersed motor rotor using the rotor oil friction loss measuring device described in Specific Embodiment 1. The simulated rotor 1-2 oil friction loss includes the loss on the outer cylindrical surface 1-5 of the rotor cylinder, the loss on the two end faces 1-6 of the rotor cylinder, the loss on the rotor shaft journal surface 1-7, and the bearing loss. These losses are represented by P. C P S P R P B This indicates that the loss coefficient per unit outer cylindrical surface of the rotor cylinder and the loss coefficient per unit journal surface of the rotor shaft are defined as k. C k R The oil friction loss of the simulated rotor is separated using a rotor oil friction loss measuring device. The separation method includes the following steps:

[0036] Step 1: Denote the simulated rotor 1-2 as structure one, and the length of the outer cylindrical surface 1-5 of the rotor cylinder is l. C The length of rotor shaft journal face 1-7 is l R At this time, the outer cylindrical surface 1-5 of the rotor cylinder and the journal surface 1-7 of the rotor shaft do not change, and Δl0=0; the simulated rotor 1-2 of structure one is assembled according to the structure of measurement component 1. After assembly, one end of the simulated rotor 1-2 of structure one is connected to the output shaft of the drive motor 3 through the coupling 2, and the simulated rotor 1-2 of structure one is dragged to the rated speed through the drive motor 3. The active power input of the drive motor 3 is measured with a power analyzer (existing technology) and recorded as P0.

[0037] Step 2: Reduce the length of the outer cylindrical surface 1-5 of the rotor cylinder of the simulated rotor 1-2 in Step 1 by Δl1, and denote the new structure as Structure 2. Assemble the simulated rotor 1-2 of Structure 2 according to the structure of Measurement Component 1 (the other parameters of the simulated rotor 1-2 remain unchanged, but the change in the length of the outer cylindrical surface 1-5 of the rotor cylinder will cause a change in the rotor shaft journal surface 1-7). After assembly, connect one end of the simulated rotor 1-2 of Structure 2 to the output shaft of the drive motor 3 through the coupling 2, and drive the simulated rotor 1-2 of Structure 2 to the rated speed through the drive motor 3. Measure the active power input to the drive motor 3 with a power analyzer and denote it as P1.

[0038] Step 3: Reduce the length of the outer cylindrical surface 1-5 of the rotor cylinder of the simulated rotor 1-2 in Step 1 by Δl2, and denote the new structure as Structure 3. Assemble the simulated rotor 1-2 of Structure 3 according to the structure of Measurement Component 1 (all other parameters remain unchanged, and the explanation is the same as in Step 2). After assembly, connect one end of the simulated rotor 1-2 of Structure 3 to the output shaft of the drive motor 3 through the coupling 2, and drive the simulated rotor 1-2 of Structure 3 to the rated speed through the drive motor 3. Measure the active power input to the drive motor 3 with a power analyzer and denote it as P2.

[0039] Step 4: In the three measurements from Steps 1 to 3 above, only the lengths of the outer cylindrical surface 1-5 of the rotor cylinder and the journal surface 1-7 of the rotor shaft changed, and the sum of the changes was 0. Therefore, the change in the input active power of the drive motor 3 caused by the change in the rotor structure is represented by the loss coefficient k per unit outer cylindrical surface of the rotor cylinder. C and rotor shaft unit journal surface loss coefficient k R It is expressed as follows:

[0040]

[0041] In equation (1), △P 10 This represents the difference in active power measured between Structure 2 and Structure 1; ΔP 20 This represents the difference in active power measured between Structure 3 and Structure 1;

[0042] The loss coefficient k per unit outer cylindrical surface of the rotor cylinder can be calculated using equation (1). C and rotor shaft unit journal surface loss coefficient k R k C and k R By multiplying the oil friction loss of the outer cylindrical surface 1-5 of the rotor cylinder and the oil friction loss of the journal surface 1-7 of the rotor shaft by the lengths of the outer cylindrical surface 1-5 of the rotor cylinder and the oil friction loss of the journal surface 1-7 of the rotor shaft, respectively, the magnitudes can be obtained.

[0043] Step 5: The length l of the outer cylindrical surface 1-5 of the simulated rotor 1-2 from Step 1 is... C Decrease Δl3, and Δl3 = l C Only the rotor shaft 1-2-1 is saved and the new structure is referred to as structure four. The simulated rotor 1-2 of structure four is assembled according to the structure of measurement component 1 (the other parameters are unchanged and are explained in the same way as in step two). After assembly, one end of the simulated rotor 1-2 of structure four is connected to the output shaft of the drive motor 3 through the coupling 2, and the simulated rotor 1-2 is dragged to the rated speed through the drive motor 3. The active power input to the drive motor 3 is measured with a power analyzer and recorded as P3.

[0044] Step Six: The difference between the active power measured in Step One and Step Five is expressed as follows:

[0045] ΔP 03 =P0-P3=P S +k C Δl3-k R Δl3 (2)

[0046] In equation (2), P s The length l of the outer cylindrical surface of the rotor cylinder is indicated. CAfter being reduced to 0, the change in oil wear loss on both ends of the rotor column due to the disappearance of the two ends is the oil wear loss on the two ends of the rotor column, i.e., the oil wear loss on the two ends of the rotor column, 1-6.

[0047] Step 7: Calculate the loss coefficient k per unit outer cylindrical surface of the rotor cylinder based on the result obtained in Step 4. C and rotor shaft unit journal surface loss coefficient k R And the oil friction loss P on both ends of the rotor cylinder obtained in step six. S By selecting any one of the simulated rotors 1-2 from structures one to four to solve for the bearing loss, the bearing oil friction loss P is obtained. B Represented as:

[0048] P B =P N -k C (l C -Δl N )-k R (l R +Δl N )-P S (3)

[0049] In equation (3), N is selected as 0, 1, 2 or 3;

[0050] Step 8: Change the speed of drive motor 3. By executing steps one to seven above, we can obtain the relationship between the outer cylindrical surface 1-5 of the rotor cylinder, the two end faces 1-6 of the rotor cylinder, the journal surface 1-7 of the rotor shaft, and the bearing oil friction loss and speed.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for separating oil friction loss of an oil-immersed motor rotor, characterized in that: The separation method is based on a rotor oil friction loss measuring device, which includes a measuring component (1), a coupling (2), and a drive motor (3). The measuring component (1) includes a housing (1-1), a simulated rotor (1-2), two end caps (1-3), and two bearings (1-4). The simulated rotor (1-2) consists of a rotor shaft (1-2-1) and a rotor column (1-2-2). The rotor column (1-2-2) is fixedly mounted on the rotor shaft (1-2-1), and the two end caps (1-3) are detachably and sealed at both ends of the housing (1-1). The simulated rotor (1-2) is installed inside the housing (1-1). Two bearings (1-4) are fixedly assembled in the center holes of the corresponding end caps (1-3). The rotor shaft (1-2-1) is coaxially assembled with the two bearings (1-4). The area enclosed by the simulated rotor (1-2), the housing (1-1), the two end caps (1-3), and the two bearings (1-4) is the oil zone (4). The part of the simulated rotor (1-2) in contact with the oil zone (4) includes the outer cylindrical surface (1-5) of the rotor cylinder, the two end faces (1-6) of the rotor cylinder, and the journal face (1-7) of the rotor shaft. One end of the rotor shaft (1-2-1) is connected to the output shaft of the drive motor (3) through the coupling (2). The simulated rotor (1-2) oil friction loss includes the loss on the outer cylindrical surface (1-5) of the rotor cylinder, the loss on both end faces (1-6) of the rotor cylinder, the loss on the rotor shaft journal surface (1-7), and the bearing loss, which are respectively represented by... , , , This indicates that the loss coefficient per unit outer cylindrical surface of the rotor cylinder and the loss coefficient per unit journal surface of the rotor shaft are defined as follows: , The oil friction loss of the simulated rotor is separated using a rotor oil friction loss measuring device. The separation method includes the following steps: Step 1: Denote the simulated rotor (1-2) as Structure 1. The length of the outer cylindrical surface (1-5) of the rotor cylinder is... The length of the rotor shaft journal face (1-7) is At this point, the outer cylindrical surface (1-5) of the rotor cylinder and the journal surface (1-7) of the rotor shaft remain unchanged. =0; Assemble the simulated rotor (1-2) of structure one according to the structure of the measuring component (1). After assembly, connect one end of the simulated rotor (1-2) of structure one to the output shaft of the drive motor (3) through the coupling (2), and drive the simulated rotor (1-2) of structure one to the rated speed through the drive motor (3). Measure the active power input of the drive motor (3) with a power analyzer and record it as P0; Step 2: Reduce the length of the outer cylindrical surface (1-5) of the rotor cylinder of the simulated rotor (1-2) from Step 1. The new structure is referred to as structure two. The simulated rotor (1-2) of structure two is assembled according to the structure of the measuring component (1). After assembly, one end of the simulated rotor (1-2) of structure two is connected to the output shaft of the drive motor (3) through the coupling (2). The simulated rotor (1-2) of structure two is dragged to the rated speed through the drive motor (3). The active power input of the drive motor (3) is measured by the power analyzer and recorded as P1. Step 3: Reduce the length of the outer cylindrical surface (1-5) of the rotor cylinder of the simulated rotor (1-2) from Step 1. The new structure is referred to as structure three. The simulated rotor (1-2) of structure three is assembled according to the structure of the measuring component (1). After assembly, one end of the simulated rotor (1-2) of structure three is connected to the output shaft of the drive motor (3) through the coupling (2). The simulated rotor (1-2) of structure three is dragged to the rated speed through the drive motor (3). The active power input of the drive motor (3) is measured by the power analyzer and recorded as P2. Step 4: In the three measurements from Step 1 to Step 3 above, only the lengths of the outer cylindrical surface (1-5) of the rotor cylinder and the journal surface (1-7) of the rotor shaft changed, and the sum of the changes was 0. Therefore, the change in the input active power of the drive motor (3) caused by the change in the rotor structure is reflected by the loss coefficient per unit outer cylindrical surface of the rotor cylinder. and rotor shaft unit journal surface loss coefficient It is expressed as follows: （1） In equation (1), This represents the difference in active power measured between Structure 2 and Structure 1; This represents the difference in active power measured between Structure 3 and Structure 1; The loss coefficient per unit outer cylindrical surface of the rotor cylinder can be calculated using equation (1). and rotor shaft unit journal surface loss coefficient , and By multiplying the oil friction loss of the outer cylindrical surface (1-5) of the rotor cylinder and the oil friction loss of the journal surface (1-7) of the rotor shaft by the lengths of the outer cylindrical surface (1-5) of the rotor cylinder and the oil friction loss of the journal surface (1-7) of the rotor shaft, respectively, the oil friction loss can be obtained. Step 5: Length of the outer cylindrical surface (1-5) of the simulated rotor (1-2) from Step 1. Decrease ,and = Only the rotor shaft (1-2-1) is saved and the new structure is recorded as structure four. The simulated rotor (1-2) of structure four is assembled according to the structure of the measuring component (1). After assembly, one end of the simulated rotor (1-2) of structure four is connected to the output shaft of the drive motor (3) through the coupling (2). The simulated rotor (1-2) is dragged to the rated speed through the drive motor (3). The active power input of the drive motor (3) is measured with a power analyzer and recorded as P3. Step Six: The difference between the active power measured in Step One and Step Five is expressed as follows: （2） In formula (2): Indicates the length of the outer cylindrical surface of the rotor cylinder. After being reduced to 0, the change in oil wear loss on both ends of the rotor column due to the disappearance of the two ends of the rotor column is the oil wear loss on both ends of the rotor column (1-6). Step 7: Calculate the loss coefficient per unit outer cylindrical surface of the rotor cylinder based on the value obtained in Step 4. and rotor shaft unit journal surface loss coefficient And the oil friction loss on both end faces (1-6) of the rotor cylinder obtained in step six. By selecting any one of the structures from structure one to structure four (1-2) to solve for the bearing loss, the bearing oil friction loss is obtained. Represented as: （3） In equation (3), N is selected as 0, 1, 2 or 3; Step 8: Change the speed of the drive motor (3). By performing steps one to seven above, we can obtain the outer cylindrical surface (1-5) of the rotor cylinder, the two end faces (1-6) of the rotor cylinder, the journal surface (1-7) of the rotor shaft, and the relationship between bearing oil wear and speed.

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