calibrating the motor

Abstract

This application provides a calibration motor, including a housing, a rear end cover, a stator assembly, and a rotor assembly. The housing has opposing openings. The rear end cover is screwed onto the housing and covers one of the openings. The stator assembly is detachably disposed within the housing. The rotor assembly is assembled inside the stator assembly and includes a shaft, bearings, and a rotor core. The rotor core is fixed to the shaft and rotates along the axis of the shaft. The bearings connect both ends of the shaft to support it. One bearing is detachably connected to the rear end cover. This design allows for the reusability of the housing, reducing costs. Furthermore, the calibration motor provided in this application has a simple structure, facilitating subsequent calibration and improving work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and more specifically, to a calibration motor. Background Technology

[0002] With the upgrading of motors, motor calibration during the R&D process requires the procurement of all parts and their assembly before calibration can be carried out. However, the large number of parts required for motor calibration and the fact that calibrated parts cannot be reused leads to wasted time and costs.

[0003] Therefore, the existing motor calibration process suffers from excessive time and cost. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a calibration motor to solve the problem of waste of time and cost.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: This application provides a calibration motor, including a housing, a rear end cover, a stator assembly, and a rotor assembly. The housing has openings that are oppositely arranged. The rear end cover is screwed onto the housing and covers one of the openings. The stator assembly is detachably disposed inside the housing. The rotor assembly is assembled inside the stator assembly and includes a rotating shaft, bearings, and a rotor core. The rotor core is fixed on the rotating shaft and rotates along the axis of the rotating shaft. The bearings connect the two ends of the rotating shaft and support the rotating shaft. One of the bearings is detachably connected to the rear end cover.

[0006] Furthermore, the calibration motor includes a bearing housing, and the rear end cover includes a fixing groove, which protrudes from the top of the inner wall of the rear end cover, and the bearing housing is welded into the fixing groove.

[0007] Furthermore, the bearing housing has a through hole, and the bearing is engaged in the through hole.

[0008] Furthermore, the bearing housing is made of steel, and the fixing groove is made of aluminum.

[0009] Furthermore, the calibration motor includes a front guide oil ring, a rear guide oil ring, and a lubricating oil passage. The front guide oil ring is located on the front side of the stator assembly and is connected to the lubricating oil passage. The rear guide oil ring is located on the rear side of the stator assembly and is connected to the lubricating oil passage, and is used to spray the cooling oil in the lubricating oil passage onto the stator assembly.

[0010] Furthermore, the calibrated motor includes a front guide oil ring washer and a rear guide oil ring washer. The front guide oil ring washer is connected to the front guide oil ring via a first screw, and the rear guide oil ring washer is connected to the rear guide oil ring via a second screw. The heights of the first and second screws are adjustable.

[0011] Furthermore, the calibration motor also includes a cooling water channel, which is located between the outer peripheral wall of the stator assembly and the inner wall of the housing. The cooling water channel is connected to the cooling water system and is used to supply cooling water to the cooling water system and absorb the heat generated by the stator assembly.

[0012] Furthermore, the outer wall of the shell is provided with an inlet and an outlet for connecting the cooling water channel. The inlet is connected to the cooling water system through an inlet pipe, and the outlet is connected to the cooling water system through an outlet pipe.

[0013] Furthermore, the calibration motor also includes a three-phase wire sleeve, which is screwed to the outside of the rear end cover, and the three-phase wire sleeve is made of a transparent material.

[0014] Furthermore, the calibration motor also includes a connecting plate screwed to the housing, the connecting plate being located at another opening, and the connecting plate being used for connection to the reducer.

[0015] The beneficial effects of this utility model embodiment are: In this embodiment, the calibration motor is configured with a detachable structure. Specifically, the rear end cover is screwed onto the housing, the stator assembly is detachably connected to the housing, and the rotor assembly is detachably connected to the rear end cover. After the calibration motor is subsequently calibrated, the housing can be reused by directly replacing the stator assembly and the rotor assembly, thereby reducing costs. At the same time, the calibration motor provided in this embodiment has a simple structure, which facilitates subsequent calibration and improves work efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly described below.

[0017] Figure 1 This is an exploded view of the overall structure of the calibration motor shown in one embodiment of this application; Figure 2 This is a top view of a calibration motor shown in one embodiment of this application; Figure 3 This is a cross-sectional view of a calibration motor shown in one embodiment of this application; Figure 4 This is a schematic diagram of the water inlet and outlet of a calibration motor, as shown in one embodiment of this application.

[0018] Reference numerals: housing 1; first opening 11; second opening 12; rear end cover 2; three-phase conductor sleeve 21; stator assembly 33; stator core 34; stator winding 35; lubricating oil passage; bearing 42; bearing seat 5; through hole 51; fixing groove 6; reinforcing rib 61; front guide oil ring washer 71; rear guide oil ring washer 72; water inlet 81; water outlet 82; connecting plate 9. Detailed Implementation

[0019] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] This application provides a calibration motor to solve the problems in the prior art, such as the complex structure of the calibration motor leading to too many parts required for subsequent calibration and the inability to reuse the calibrated parts, resulting in wasted costs.

[0021] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0022] This application provides a calibration motor, including a housing 1, a rear end cover 2, a stator assembly 33, and a rotor assembly.

[0023] The housing 1 has openings that are positioned opposite each other.

[0024] The rear end cover 2 is screwed to the housing 1, and the rear end cover 2 is located at one of the openings.

[0025] The stator assembly 33 is detachably disposed within the housing 1.

[0026] The rotor assembly is assembled inside the stator assembly 33. The rotor assembly includes a shaft, a bearing 42 and a rotor core. The rotor core is fixed on the shaft and rotates along the axis of the shaft. The bearing 42 connects the two ends of the shaft and is used to support the shaft. One of the bearings 42 is detachably connected to the rear end cover 2.

[0027] This embodiment of the application, by configuring the stator assembly 33 to be detachably connected to the housing 1 and the rotor assembly to be detachably connected to the rear end cover 2, allows the stator assembly 33 and the rotor assembly of the calibration motor to be removed from the housing 1 after calibration. This enables the reuse of components other than the stator assembly 33 and the rotor assembly of the calibration motor, while reducing the number of replacement parts and saving costs. Furthermore, the housing 1 of the calibration motor provided in this embodiment can be reused repeatedly or stockpiled in advance, shortening the product development cycle.

[0028] In one embodiment, the opening includes a first opening 11 and a second opening 12, which are located at both ends of the housing 1 along the axial direction of the housing 1. The first opening 11 and the second opening 12 communicate to form a mounting cavity inside the housing 1 for mounting the rotor assembly and stator assembly 33 and other components.

[0029] The axial direction of housing 1 is the axial axis direction when the rotor assembly rotates.

[0030] In one embodiment, the stator assembly 33 can be installed in the housing 1 by means of a snap or a hook.

[0031] In one embodiment, the rear cover 2 can be attached to the first opening 11 by means of a threaded connection.

[0032] In one embodiment, the calibration motor includes a bearing housing 5, and the rear end cover 2 includes a fixing groove 6. The fixing groove 6 protrudes from the top of the inner wall of the rear end cover 2, and the bearing housing 5 is welded into the fixing groove 6.

[0033] In the above embodiment, the fixing groove 6 is an integrally formed structure with the inner wall of the rear end cover 2, and the fixing groove 6 is formed by at least a portion of the inner wall of the rear end cover 2 extending away from the outer wall of the rear end cover 2 during the processing.

[0034] In another embodiment, the calibration motor includes a bearing housing 5 and a fixing groove 6. The rear end cover 2 is provided with the fixing groove 6. The fixing groove 6 can be installed on the inner wall of the rear end cover 2 near the first opening 11 by welding. The bearing housing 5 is welded into the fixing groove 6.

[0035] In the above scheme, the bearing housing 5 is compatible with all bearings 42, thereby realizing the function of replaceable rotor assembly.

[0036] In one embodiment, the bearing housing 5 can be made of steel, and the fixing groove 6 can be made of aluminum.

[0037] During assembly, the bearing housing 5 is engaged in the fixing groove 6, and the bearing housing 5 and the fixing groove 6 are interference fit. The steel and aluminum are welded and fixed by heat treatment.

[0038] In one embodiment, the bearing housing 5 has a through hole 51, and one of the bearings 42 in the above embodiment is engaged in the through hole 51 to achieve a detachable connection between the bearing 42 and the rear end cover 2. The bearing 42 is rotatably disposed within the bearing housing 5. The outer peripheral wall of the rotor assembly shaft and the inner peripheral wall of the bearing 42 are configured with an interference fit. In one embodiment, the diameter of the shaft can be set to be slightly larger than the diameter of the bearing 42 to ensure the connection stability between the shaft and the bearing 42, ensure synchronous rotation of the inner ring of the shaft and the bearing 42, and reduce relative slippage. In another embodiment, the diameter of the shaft can be set to be smaller than the diameter of the bearing 42.

[0039] It is understandable that the rear end cover 2 is the axial cover of the aforementioned housing 1 and also the support for the rotor assembly's shaft. By setting the bearing seat 5 to support the bearing 42, the rotor assembly obtains a stable rotation center.

[0040] In one embodiment, the outer peripheral wall of the fixing groove 6 is provided with a plurality of reinforcing ribs 61, which extend along the inner wall of the rear end cover 2 toward the bearing 42.

[0041] In one embodiment, the calibration motor includes a stator assembly, which includes a front guide oil ring, a rear guide oil ring, a stator assembly 33, a lubrication oil passage, a stator end cover, a stator frame, etc. The stator assembly 33 serves as the power input terminal and is assembled inside the housing 1. The rotor assembly is the core moving component for energy conversion and is assembled inside the stator assembly 33 and rotates along the axis of the rotating shaft.

[0042] The front guide oil ring is located on the front side of the stator assembly 33 and is connected to the lubricating oil passage. The front guide oil ring has several front guide oil holes, which are distributed circumferentially along the front guide oil ring. These holes are used to spray the cooling oil in the lubricating oil passage onto the stator assembly 33 to dissipate heat and cool at least a portion of the front side of the stator assembly 33.

[0043] The rear guide oil ring is located on the rear side of the stator assembly 33 and is connected to the lubricating oil passage. The rear guide oil ring has several rear guide oil holes, which are distributed circumferentially along the rear guide oil ring. These holes are used to spray the cooling oil in the lubricating oil passage onto the stator assembly 33 to dissipate heat and cool at least a portion of the rear side of the stator assembly 33.

[0044] In one embodiment, the stator assembly 33 includes a stator core 34, a stator winding 35, etc. A front guide oil ring can be disposed at the end of the stator core 34, and a rear guide oil ring is disposed on the side of the stator winding 35 away from the stator core 34. It is usually arranged along the axial direction of the stator winding 35 and achieves axial spray cooling oil cooling through its rear guide oil hole to ensure uniform cooling of the stator winding 35.

[0045] It should be noted that in the field of motor calibration, the calibration process essentially involves forcing the motor to operate under various conditions (such as different torques and speeds) to measure its response. During this process, other components in the stator assembly 33, such as the stator winding 35, will generate heat, and the stator core 34 will experience eddy current losses. These losses will ultimately be converted into heat energy, causing the temperature of various components in the calibrated motor to rise. Therefore, the core physical principle of calibration is to achieve thermal balance or to perform precise closed-loop control of the thermal state. To control the temperature rise of various components in the calibrated motor, active cooling of the stator assembly 33 and other components is necessary. Therefore, this application sets up a front guide oil ring and a rear guide oil ring, so that the cooling oil cup is guided to the front guide oil ring and the rear guide oil ring. By utilizing the specific flow channels on the rotating or fixed structure, the cooling oil is precisely guided from the radial or axial direction of the stator core 34 to the top and end of the stator core 34. By guiding the cooling oil to perform forced convection heat exchange with the heat-generating components (stator assembly 33, etc.), the heat generated by the heat generation is efficiently removed. This allows the calibrated motor to quickly reach a stable and repeatable thermal state in subsequent calibration cycles, thereby ensuring that each measurement is performed under the same thermal boundary conditions.

[0046] In one embodiment, the housing 1 has an oil inlet and an oil outlet. Cooling oil flows from the oil inlet of the housing 1 into the oil chambers of the front guide oil ring and the rear guide oil ring in sequence, and is evenly sprayed onto the surface of the stator winding 35 through the front guide oil hole and the rear guide oil hole. Then, it flows back to the oil outlet of the housing 1 through the lubricating oil channel, which can both ensure heat dissipation for the stator core 34 and directly cool the stator winding 35.

[0047] In one embodiment, the lubricating oil passage is connected to an oil pump, which is connected to an external cooling oil system. Cooling oil is pumped into the top of the stator assembly 33 via the oil pump, flows along the interior of the lubricating oil passage, and surrounds the cooling stator assembly 33.

[0048] Specifically, the calibration motor also includes an annular groove, which is set on the inner wall of the housing 1 and surrounds the outer circle of the stator core 34. During assembly, the stator core 34 is pressed into the housing 1 by interference fit or fitting and is made to fit tightly in the area of ​​the annular groove. The oil port of the cooling oil housing 1 is first injected into the annular groove to fill it with cooling oil and evenly pressurize it before entering the next flow path to ensure that the cooling oil can evenly surround the entire stator assembly 33.

[0049] The stator core 34 includes stator slots for accommodating and fixing the stator winding 35. Cooling oil flows into the stator slots to cool the stator winding 35.

[0050] For example, after being pressurized by an oil pump, the cooling oil flows into the annular groove and is sprayed in an umbrella shape through the oil guide hole of the oil guide ring onto the top of the stator core 34 and the end stator winding 35, so as to achieve preferential cooling of the top of the stator assembly 33. Specifically, the cooling oil enters the corresponding oil guide ring, where it is collected and its flow direction is changed from axial flow to uniform radial distribution. Then, part of the cooling oil flows out from the oil guide hole of the oil guide ring and is sprayed onto the end stator winding 35 of the stator core 34. Part of the cooling oil enters the lubricating oil channel under the combined action of gravity and oil pressure, and then flows laterally into the stator groove to perform secondary cooling on the stator winding 35 in the stator groove. The cooled oil after absorbing heat is finally collected from the oil return hole at its bottom and flows back into the cooling oil system from the oil outlet of the housing 1. During the above process, the cooling oil fully absorbs the large amount of heat generated by the electromagnetic loss of the stator core 34, causing the temperature to rise. Finally, it flows back into the cooling oil system by gravity or the system's return oil design, completing a complete cooling cycle, thereby ensuring that the stator core 34 always operates within a safe temperature range.

[0051] It should be noted that the front side of the stator assembly 33 is the side closest to the second opening 12 of the housing 1 when the stator assembly 33 is installed inside the housing 1, and the rear side of the stator assembly 33 is the side closest to the first opening 11 of the housing 1 when the stator assembly 33 is installed inside the housing 1.

[0052] In practical use, the front side of the stator assembly 33 can also be the side of the stator assembly 33 that is close to the first opening 11 of the housing 1 when the stator assembly 33 is installed inside the housing 1, and the rear side of the stator assembly 33 can also be the side of the stator assembly 33 that is close to the second opening 12 of the housing 1 when the stator assembly 33 is installed inside the housing 1.

[0053] In one embodiment, a lubricating oil passage is provided, and both the front guide oil ring and the rear guide oil ring are connected to the lubricating oil passage to guide the flow of cooling oil in the lubricating oil passage. At the same time, both the front guide oil ring and the rear guide oil ring are provided with multiple oil guide holes, through which the cooling oil in the lubricating oil passage flows out and is sprayed onto the outer surface of the stator assembly 33 for cooling and lubrication.

[0054] In another embodiment, there may be two lubrication channels, including a first lubrication channel and a second lubrication channel, with a front guide ring connected to the first lubrication channel and a rear guide ring connected to the second lubrication channel.

[0055] The front guide oil ring has multiple front guide oil holes, and the rear guide oil ring has multiple rear guide oil holes. The cooling oil in the first lubrication oil passage flows out through the multiple front guide oil holes and is sprayed onto at least a portion of the front side of the stator assembly 33. The cooling oil in the second lubrication oil passage flows out through the multiple rear guide oil holes and is sprayed onto at least a portion of the rear side of the stator assembly 33.

[0056] In one embodiment, the calibrated motor includes a front guide oil ring washer 71 and a rear guide oil ring washer 72. The front guide oil ring washer 71 is connected to the front guide oil ring by a first screw, and the rear guide oil ring washer 72 is connected to the rear guide oil ring by a second screw.

[0057] The front guide ring washer 71 is tightly connected to the front guide ring, and the rear guide ring washer 72 is tightly connected to the rear guide ring, which is used to seal the lubricating oil passage and ensure that the cooling oil does not leak.

[0058] The heights of the first and second screw components are adjustable. By adjusting the heights of the first and second screw components respectively, it is possible to make them compatible with different types of stator assemblies 33, thereby improving the product compatibility of the calibrated motor.

[0059] In this embodiment, the first and second screw components are height-adjustable. The threaded structure of the first screw component allows for fine-tuning of the gap or position connecting the front guide oil ring washer 71 and the front guide oil ring. The threaded structure of the second screw component allows for fine-tuning of the gap or position connecting the rear guide oil ring washer 72 and the rear guide oil ring. This enables flexible adjustment based on different types of stator assemblies 33, ensuring compatibility with various stator assemblies 33.

[0060] In one embodiment, the calibration motor further includes a cooling water channel, which is disposed between the outer peripheral wall of the stator assembly 33 and the inner wall of the housing 1, and is axially disposed on the housing 1. The cooling water channel is connected to a cooling water system located outside the calibration motor through an inlet pipe, for supplying cooling water to the cooling water system and absorbing the heat generated by the stator assembly 33 to provide auxiliary cooling for the stator assembly 33.

[0061] In one embodiment, the cooling water channel can be connected to the cooling water system via a water pump. The water pump is electrically connected to the control system, which controls the operation of the water pump to pump cooling water into the cooling water channel.

[0062] In one embodiment, the outer wall of the housing 1 is provided with an inlet 81 and an outlet 82 that connect to the cooling water channel. The cooling water channel has an inlet and a outlet. The inlet is connected to the inlet of the housing 1, and the outlet is connected to the outlet of the housing 1. The inlet 81 is connected to the cooling water system through an inlet pipe and is used to guide the cooling water in the cooling water system into the cooling water channel. The outlet 82 is connected to the cooling water system through an outlet pipe and is used to export the cooling water that has undergone heat exchange in the cooling water channel to the cooling water system.

[0063] During operation, cooling water is introduced through inlet 81 and enters the cooling water channel through the inlet. The cooling water circulates back and forth in the axial direction of the housing 1. After cooling the housing 1 once, it flows out from the drain to the outlet 82 to achieve the purpose of temperature control of the stator assembly.

[0064] In one embodiment, the calibration motor further includes multiple temperature sensors disposed at the end of the stator assembly 33 for monitoring the real-time temperature of the stator assembly 33 and transmitting the temperature signal to the control system. The control system precisely controls the flow rate of the cooling oil and cooling water based on the detected temperature to accurately control the temperature of the stator assembly 33.

[0065] In the above scheme, the calibrated motor can be cooled in real time with cooling oil and assisted by cooling water. When the control system determines that the temperature sensor detects that the temperature of the stator assembly 33 has increased, it controls the opening of the water pump to increase the flow rate of the cooling water in the cooling water channel to quickly cool down the motor. When the control system determines that the temperature sensor detects that the temperature of the stator assembly 33 has decreased, it controls the opening of the water pump to decrease the flow rate of the cooling water in the cooling water channel to slow down the rate of temperature decrease.

[0066] This application embodiment uses cooling water-assisted circulation for heat dissipation to ensure the temperature of the calibrated motor remains stable during the calibration process, thereby improving heat dissipation efficiency. It is suitable for high-power, high-speed motors, with low maintenance costs, thus saving a lot of money and time.

[0067] In one embodiment, the calibration motor further includes a three-phase wire guide sleeve 21, which is screwed to the outside of the rear end cover 2 to fix the three-phase wires and prevent them from short-circuiting. The three-phase wire guide sleeve 21 is made of transparent PC material, which makes it easy for users to observe the lubricating oil passages inside the calibration motor.

[0068] In one embodiment, the calibration motor further includes a connecting plate 9, which is screwed to the housing 1 and located at another opening, namely the second opening 12. The connecting plate 9 is used for the connection between the housing 1 and the reducer, and can also act on the front guide oil ring washer 71 to press the front guide oil ring washer 71 to improve sealing and structural connection stability.

[0069] The calibration motor provided in this application embodiment can achieve precise electrical energy-mechanical energy conversion through the stator assembly 33 and the rotor assembly to generate measurable signals. At the same time, through the mechanical and thermal management subsystem composed of components such as the rear end cover 2, the front guide oil ring, the rear guide oil ring, the front guide oil ring washer 71, and the rear guide oil ring washer 72, a thermally and mechanically stable internal environment is created for the calibration motor.

[0070] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0071] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0072] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A calibration motor, characterized in that, include: The housing has openings that are disposed opposite each other; A rear end cover is screwed to the housing, and the rear end cover is disposed at one of the openings; The stator assembly is detachably disposed within the housing; A rotor assembly is assembled inside the stator assembly. The rotor assembly includes a shaft, bearings, and a rotor core. The rotor core is fixed to the shaft and rotates along the axis of the shaft. The bearings connect the two ends of the shaft and support the shaft. One of the bearings is detachably connected to the rear end cover.

2. The calibration motor according to claim 1, characterized in that, The calibration motor includes a bearing housing, and the rear end cover includes a fixing groove. The fixing groove protrudes from the top of the inner wall of the rear end cover, and the bearing housing is welded into the fixing groove.

3. The calibration motor according to claim 2, characterized in that, The bearing housing has a through hole, and the bearing is engaged in the through hole.

4. The calibration motor according to claim 2, characterized in that, The bearing housing is made of steel, and the fixing groove is made of aluminum.

5. The calibration motor according to claim 1, characterized in that, The calibration motor includes a front guide oil ring, a rear guide oil ring, and a lubricating oil passage. The front guide oil ring is located on the front side of the stator assembly and communicates with the lubricating oil passage. The rear guide oil ring is located on the rear side of the stator assembly and communicates with the lubricating oil passage, and is used to spray the cooling oil in the lubricating oil passage onto the stator assembly.

6. The calibration motor according to claim 5, characterized in that, The calibration motor includes a front guide oil ring washer and a rear guide oil ring washer. The front guide oil ring washer is connected to the front guide oil ring by a first screw, and the rear guide oil ring washer is connected to the rear guide oil ring by a second screw. The heights of the first screw and the second screw are adjustable.

7. The calibration motor according to claim 1, characterized in that, The calibration motor also includes a cooling water channel, which is disposed between the outer peripheral wall of the stator assembly and the inner wall of the housing. The cooling water channel is connected to the cooling water system for supplying cooling water to the cooling water system and absorbing the heat generated by the stator assembly.

8. The calibration motor according to claim 7, characterized in that, The outer wall of the housing has an inlet and an outlet that connect to the cooling water channel. The inlet is connected to the cooling water system through an inlet pipe, and the outlet is connected to the cooling water system through an outlet pipe.

9. The calibration motor according to claim 1, characterized in that, The calibration motor also includes a three-phase wire sleeve, which is screwed to the outside of the rear end cover, and the three-phase wire sleeve is made of a transparent material.

10. The calibration motor according to claim 1, characterized in that, The calibration motor also includes a connecting plate, which is screwed to the housing. The connecting plate is located at another opening and is used to connect to the reducer.

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