A detection unit for high and low temperature environment motor test

Abstract

This invention relates to the field of electromechanical instrument testing technology, specifically providing a testing unit for motor testing in high and low temperature environments. The unit includes a sealed cavity, and a data acquisition module and a temperature compensation module disposed within the sealed cavity. The data acquisition module acquires the motor's voltage, current, and speed. A temperature sensor measures the temperature within the sealed cavity and transmits the measured temperature to an operational amplifier with a preset temperature drift compensation algorithm. This algorithm compensates for errors in the data acquisition module when acquiring motor data at temperatures outside the rated operating temperature. A protective membrane is provided on the sealed cavity to balance the internal and external air pressure. A heating auxiliary component is provided within the sealed cavity; when the temperature within the sealed cavity is lower than a preset condensation temperature threshold, the heating auxiliary component heats the cavity; when the temperature within the sealed cavity is higher than the condensation temperature threshold, the heating auxiliary component does not heat the cavity. This invention achieves accurate unprotected motor testing in high and low temperature environments through heating the sealed cavity to prevent condensation and using a temperature drift compensation algorithm.

Description

Technical Field

[0001] This invention belongs to the field of electromechanical instrument testing technology, and in particular relates to a testing unit for testing motors in high and low temperature environments. Background Technology

[0002] A high and low temperature environment motor screening device has been disclosed in the prior art. This device mainly consists of a base, 16-station drive components, a gear-clutch driven component, and a motor bracket. Each drive component includes a pinion shaft, a pinion, and an electromagnetic clutch. By controlling the on / off state of the electromagnetic clutch, this device can simulate the load and detect the basic torque of a single-station motor. It can perform batch screening of motors in a high and low temperature test chamber, solving the problem of low single-station testing efficiency of traditional purely mechanical testing equipment.

[0003] However, existing high and low temperature environment motor screening devices only complete the load simulation design at the mechanical structure level, and have significant shortcomings in electronic testing and inspection methods. They are unable to meet the accuracy and authenticity requirements of high-end industrial motors for high and low temperature screening. The specific problems are as follows: 1. There is no dedicated electronic detection unit. External general testing equipment is required to complete parameter acquisition. However, the electronic components of the external equipment, such as acquisition modules, sensors, and circuit boards, are prone to signal short circuits and poor contact due to condensation at low temperatures in the closed environment of the high and low temperature test chamber. They may also cause component parameter drift due to high temperatures, resulting in distorted detection signals that cannot accurately reflect the true performance of the motor in harsh environments. 2. The lack of anti-interference design adapted to the 16-station structure of the motor screening device makes it easy for signal interference and asynchronous acquisition between stations to occur during batch testing, further reducing the testing accuracy; 3. The single test method of "comparing output torque with theoretical data" is used alone. In addition, the electronic detection signal is prone to distortion, which makes it easy to miss the motor's own high and low temperature performance defects such as condensation at the motor terminals, high temperature attenuation of windings, demagnetization of magnets, and bearing jamming. As a result, the selected motors are still prone to failure in actual high and low temperature conditions without protection. 4. If heat insulation and moisture protection measures are added to the motor under test in order to solve the problem of interference resistance of electronic components, it will mask the high and low temperature tolerance defects of the motor itself, which is seriously inconsistent with the actual unprotected scenario of motor use and loses the practical significance of screening and testing.

[0004] Based on the shortcomings of the existing technology, there is an urgent need to design an electronic anti-interference detection unit that can be seamlessly integrated with the mechanical structure of the original high and low temperature environment motor screening device, and to provide a scientific testing method. Under the premise of ensuring the anti-interference of electronic detection components and the accuracy of signal acquisition, the tested motor should be kept in an unprotected high and low temperature environment consistent with actual use throughout the process, so as to achieve the unity of detection accuracy and scenario realism, and complete the electronic upgrade of the original mechanical device and the optimization of the testing method. Summary of the Invention

[0005] In view of this, the present invention aims to provide a testing unit for testing motors in high and low temperature environments. It protects only its own electronic components through a sealed cavity, blocks heat conduction with heat insulation gaskets, and fully exposes the motor terminals by using bare wire crimping, thereby achieving self-interference immunity of the testing unit and unprotected motor under test. Auxiliary heating elements are added to counteract low-temperature condensation, and a temperature drift compensation algorithm compensates for errors in motor data collected by the acquisition module at non-rated operating temperatures. At the same time, the combination of multi-parameter acquisition and temperature cycle screening accurately screens out defects in the motor itself under high and low temperature environments.

[0006] To achieve the above objectives, the technical solution created by this invention is implemented as follows: This invention provides a testing unit for testing motors in high and low temperature environments, comprising: a motor installed inside a high and low temperature test chamber; the testing unit includes: a sealed cavity, and a data acquisition module and a temperature compensation module installed inside the sealed cavity. The acquisition module and the motor are connected via shielded flexible wires. The acquisition module is used to acquire the voltage, current and speed of the motor. The temperature compensation module includes a temperature sensor and an operational amplifier. The temperature sensor is used to measure the temperature inside the sealed cavity and transmit the measured temperature to the operational amplifier. The operational amplifier has a preset temperature drift compensation algorithm, which compensates for the error in acquiring motor data by the acquisition module when it is outside the rated operating temperature. The sealed cavity has an opening with a protective membrane at the opening. The protective membrane is waterproof and breathable and is used to balance the air pressure inside and outside the sealed cavity. The inner surface of the sealed cavity is covered with a hydrophobic layer. The sealed cavity is equipped with a heating accessory. When the temperature inside the sealed cavity is lower than the preset condensation temperature threshold, the heating accessory heats the cavity. When the temperature inside the sealed cavity is higher than the condensation temperature threshold, the heating accessory does not heat the cavity.

[0007] Preferably, the detection unit for testing motors in high and low temperature environments is arranged on a motor screening device. The motor screening device includes a power supply, a drive assembly, a passive assembly, and a base for mounting and fixing the drive assembly and the passive assembly. The drive assembly includes a pinion shaft, a pinion, and an electromagnetic clutch. The pinion is fixedly arranged at one end of the pinion shaft, and the other end of the pinion shaft is connected to the rotor end of the electromagnetic clutch. The stator end of the electromagnetic clutch is connected to the motor through a connecting shaft. The passive assembly includes a large gear shaft and a large gear. The large gear is fixedly sleeved on the large gear shaft, and the large gear and the pinion mesh. A motor bracket is connected to the outer surface of the base, and the motor is fixedly connected to the motor bracket.

[0008] Preferably, the testing unit for testing motors in high and low temperature environments is mounted on the motor bracket.

[0009] Preferably, it also includes a heat insulation pad, which is placed between the testing unit for testing motors in high and low temperature environments and the motor bracket. The heat insulation pad is used to block the heat from the testing unit for testing motors in high and low temperature environments from being conducted to the motor bracket.

[0010] Preferably, the acquisition module includes: a power supply terminal and a signal terminal; the power supply terminal is connected to the power supply of the motor screening device; and the signal terminal is connected to the motor.

[0011] Preferably, the temperature sensor is an NTC thermistor.

[0012] Preferably, the heat insulation pad is made of silicone material with a thickness of 2 mm or more and 3 mm or less, and a temperature tolerance range of -55°C or more and +125°C or less.

[0013] Preferably, the heating element is a ceramic heating element with a power of less than 5W.

[0014] Preferably, the temperature drift compensation algorithm is used to offset the drift, as follows: ; in: These are the standard parameter values ​​of the motor after compensation using the temperature drift compensation algorithm on the collected data. The acquisition module collects the original parameter values ​​of the motor in real time. To acquire the temperature drift coefficient of the acquisition module, This represents the real-time temperature inside the sealed cavity.

[0015] Compared with the prior art, the present invention can achieve the following beneficial effects: The sealed protective cavity of the detection unit in this invention only protects the electronic components of the detection unit itself. The heat insulation gasket completely blocks heat conduction, and the bare wire crimping completely exposes the motor terminals. The motor has no additional protection throughout the process and directly withstands harsh environments such as high and low temperatures and condensation. This accurately screens out inherent performance defects such as condensation at the terminals, high-temperature attenuation of the windings, demagnetization of the magnets, and bearing jamming, avoiding distortion of screening results caused by interference from the detection unit.

[0016] The system addresses the root cause of low-temperature condensation on electronic components by using a sealed cavity and low-power auxiliary heating elements; industrial-grade wide-temperature elements and temperature compensation circuits are used to offset high-temperature drift in real time, with a detection error of ≤±1%; shielded flexible wires effectively suppress electromagnetic interference between 16 stations, ensuring the accuracy and stability of multi-parameter acquisition.

[0017] The detection unit has a miniaturized and modular structure, which can be installed one by one with the original 16-station motor bracket. It directly utilizes the 24V DC power supply of the motor screening device and the electromagnetic clutch linkage interface, without the need to modify any mechanical structure, making it easy to modify in industrial sites.

[0018] This invention overcomes the limitation of motor screening devices that only measure torque by proposing a multi-parameter coupled judgment based on current, voltage, speed, and torque. It also adds a temperature-cycled re-screening step to effectively identify hidden defects during temperature surges. Simultaneously, it achieves automated 16-station polling detection with no human intervention throughout the process, employing a primary and secondary screening grading mode to significantly improve batch screening efficiency.

[0019] The testing unit features a closed, modular design, making it fully compatible with high and low temperature test chambers. It automatically stores all data and generates test reports, meeting the stringent requirements for information-based and traceable testing processes in the mass production of high-end industrial motors. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a structural diagram of a detection unit for testing motors in high and low temperature environments, provided according to an embodiment of the present invention. Figure 2 This is a structural diagram of a motor screening device for high and low temperature environments provided according to an embodiment of the present invention; Figure 3 This is a flowchart of a testing method for motor testing in high and low temperature environments provided according to an embodiment of the present invention.

[0021] The reference numerals in the figures include: Detection unit 1, motor bracket 2, protective film 3, acquisition module 4, temperature compensation module 5, signal terminal 6, power supply terminal 7, sealed cavity 8, heating accessory 9, heat insulation pad 10, motor 11, electromagnetic clutch 12, drive assembly 13. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and do not constitute a limitation thereof. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the invention. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the invention are not shown or described in the specification. This is to avoid obscuring the core parts of the invention with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; the relevant operations can be fully understood based on the description in the specification and general technical knowledge in the art.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined to form various implementations. Furthermore, the order of the steps or actions in the method description can be changed or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various orders in the specification and drawings are merely for the clear description of a particular embodiment and do not imply a mandatory order, unless otherwise stated that a particular order must be followed.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and 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, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical 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 will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Please see Figure 1 In one embodiment of the present invention, a detection unit 1 for testing a motor 11 in a high and low temperature environment is provided, comprising: the motor 11 is arranged in a high and low temperature test chamber, characterized in that the detection unit 1 comprises: a sealed cavity 8, and a data acquisition module 4 and a temperature compensation module 5 arranged in the sealed cavity 8; The acquisition module 4 and the motor 11 are connected by a shielded flexible cable. The acquisition module 4 is used to acquire the voltage, current and speed of the motor 11. The temperature compensation module 5 includes a temperature sensor and an operational amplifier. The temperature sensor is used to measure the temperature inside the sealed cavity 8 and transmit the measured temperature inside the cavity to the operational amplifier. The operational amplifier has a preset temperature drift compensation algorithm, which compensates for the error in the acquisition module 4 when acquiring the data of the motor 11 under non-rated operating temperature.

[0028] The sealed cavity 8 has an opening, and a protective membrane 3 is installed at the opening. The protective membrane 3 is a waterproof and breathable membrane used to balance the internal and external air pressure of the sealed cavity 8. A hydrophobic layer is provided on the inner surface of the sealed cavity 8. A heating auxiliary component 9 is provided inside the sealed cavity 8. When the temperature inside the sealed cavity 8 is lower than the preset dew temperature threshold, the heating auxiliary component 9 heats the cavity. When the temperature inside the sealed cavity 8 is higher than the dew temperature threshold, the heating auxiliary component 9 does not heat the cavity.

[0029] Please see Figure 2 The detection unit 1 is installed on the existing high and low temperature environment motor screening device. The motor screening device includes a power supply, a drive assembly 13, a passive assembly, and a base for mounting and fixing the drive assembly 13 and the passive assembly. The drive assembly 13 includes a pinion shaft, a pinion, and an electromagnetic clutch 12. The pinion is fixedly sleeved on one end of the pinion shaft, and the other end of the pinion shaft is connected to the rotor end of the electromagnetic clutch 12. The stator end of the electromagnetic clutch 12 is connected to the motor 11 through a connecting shaft. The passive assembly includes a large gear shaft and a large gear. The large gear is fixedly sleeved on the large gear shaft, and the large gear and the pinion mesh. There are 16 drive assemblies 13. The motor bracket is installed on the outer surface of the drive assembly 13, and the motor 11 is fixedly connected to the motor bracket 2.

[0030] The detection unit 1 is a small modular structure with electronic anti-interference, which can be installed one-to-one with the 16 motor brackets 2 of the motor screening device without modifying any mechanical structure of the motor screening device. The detection unit 1 includes: a protective film 3, a data acquisition module 4, a temperature compensation module 5, a signal terminal 6, a power supply terminal 7, a sealed cavity 8, a heating accessory 9, and a heat insulation pad 10.

[0031] The sealed cavity 8 is made of metal or engineering plastic and is waterproof and breathable. An opening is provided on the sealed cavity 8, and a protective membrane 3 is installed at the opening. This protective membrane 3 is waterproof and breathable, used to balance the air pressure inside and outside the sealed cavity 8, preventing deformation due to thermal expansion and contraction under high and low temperature environments. A hydrophobic layer, a nano-hydrophobic coating, is uniformly coated on the inner surface of the sealed cavity 8 to prevent condensation. The sealed cavity 8 is also filled with a desiccant, made of silica gel, to absorb any trace amounts of moisture that may be present inside the cavity, preventing moisture from adhering to the surface of electronic components and causing signal interference. The sealed cavity 8 only covers its own electronic components and does not contact or enclose any part of the motor 11, thus providing no protection for the motor 11.

[0032] The sealed cavity 8 houses a data acquisition module 4 and a temperature compensation module 5. The data acquisition module 4 collects data from the motor 11, including its current, voltage, and speed. The core components of the data acquisition module 4 are industrial-grade wide-temperature components with a temperature drift coefficient ≤50ppm / ℃. The data acquisition module 4 includes a power supply terminal 7 and a signal terminal 6. The power supply terminal 7 is connected to the power supply (24V DC low-voltage power supply) of the motor screening device; the signal terminal 6 is connected to the motor 11. The data acquisition module 4 achieves bare-wire crimping with the motor 11 via a shielded flexible wire. The outer surface of the shielded flexible wire is made of tinned copper mesh, and the core is made of copper wire. The outer surface of the core is insulated with fluoroplastic, which has a working temperature tolerance range of -55℃ to +125℃. The tinned copper mesh on the outer surface of the shielded flexible wire is grounded to suppress electromagnetic interference in high and low temperature environments and during batch testing at 16 stations; it does not provide any protection for the motor 11. The bare wire crimping adopts a cold crimping process: the core of the shielded flexible wire is directly crimped to the core of the electrical connection terminal of the motor 11. There is no insulation wrapping, heat insulation protection, or moisture-proof treatment at the crimping point, so that the condensation and high temperature heat radiation in the high and low temperature test chamber can directly act on the crimping part, accurately exposing the high and low temperature performance defects of the motor 11 terminal.

[0033] Temperature compensation module 5 is connected to acquisition module 4. Temperature compensation module 5 includes a temperature sensor and an operational amplifier. The temperature sensor uses an NTC thermistor to detect the temperature inside the sealed cavity 8 in real time and transmits the temperature signal to the operational amplifier. The operational amplifier is a wide-temperature compensation operational amplifier with a preset temperature drift compensation algorithm. The temperature drift compensation algorithm is used to compensate for the errors in the motor 11 data acquired by acquisition module 4 in high-temperature environments (i.e., real-time correction of the measured values ​​of current, voltage, and speed to compensate for measurement drift caused by changes in ambient temperature).

[0034] The temperature drift compensation algorithm uses a linear compensation formula, with 25℃ as the reference calibration temperature. The temperature drift compensation algorithm is expressed as: ; in: To compensate for the standard parameter values ​​(voltage, current, speed) of motor 11 after data acquisition using the temperature drift compensation algorithm. The acquisition module 4 collects the raw parameter values ​​(voltage, current, speed) of motor 11 in real time. The temperature drift coefficient for acquisition module 4 is set to 50 ppm / ℃ = 0.00005 / ℃. The real-time temperature inside the sealed cavity 8 (acquired by an NTC thermistor).

[0035] The operational amplifier calculates and outputs the compensated data in real time according to the temperature drift compensation algorithm, ensuring that the error of the compensated detection data is less than or equal to ±1%.

[0036] Heating components 9 are installed on the inner wall of the sealed cavity 8. These components are ceramic heating elements with a power of less than 5W. The heating components 9 are connected to a temperature sensor (NTC thermistor) to form a closed-loop temperature control system. A dew point temperature threshold is set within the sealed cavity 8, which is 2-3°C higher than the dew point temperature of the high and low temperature test chamber. When the temperature sensor detects that the temperature inside the sealed cavity 8 is lower than the dew point temperature threshold, the heating components 9 automatically activate to heat; when the temperature inside the sealed cavity 8 is greater than or equal to the dew point temperature threshold, the heating components 9 do not heat. The internal temperature of the cavity is always higher than the dew point temperature, thus preventing condensation on the surface of electronic components at the source.

[0037] The testing unit 1 also includes a heat insulation gasket 10. The heat insulation gasket 10 is positioned between the sealed cavity 8 and the motor bracket 2. The heat insulation gasket 10 is made of high- and low-temperature resistant silicone material with a thickness greater than or equal to 2 mm and less than or equal to 3 mm, and a temperature tolerance range greater than or equal to -55℃ and less than or equal to +125℃. The heat insulation gasket 10 is tightly fitted to both the sealed cavity 8 and the motor bracket 2 without gaps, completely blocking heat conduction from the sealed cavity 8 to the motor bracket 2 and the motor 11. Simultaneously, it isolates the dry environment inside the cavity 8, preventing indirect alteration of the condensation conditions around the motor 11, ensuring that the temperature and condensation environment of the motor 11 are entirely controlled by the high and low temperature test chamber and are not affected by the testing unit 1.

[0038] Each detection unit 1 is linked to the electromagnetic clutch 12 of the corresponding station of the motor screening device via an electrical control interface. This enables automated linkage control with the electromagnetic clutch 12 closing to start the motor 11 and synchronously acquiring multiple parameters. When the electromagnetic clutch 12 is disengaged, the acquisition stops. The power supply 7 directly uses the 24V DC low-voltage power supply of the motor screening device, requiring no additional wiring.

[0039] Please see Figure 3 In another embodiment of the present invention, a detection method for a motor screening device in high and low temperature environments is provided, wherein a detection unit 1 is arranged on the motor support 2 of the motor screening device, and the method includes the following steps: S1: Initial calibration. After the detection unit 1 is installed one by one with the 16 motor brackets 2 of the motor screening device, the electromagnetic clutch 12 of the motor screening device is closed sequentially under normal temperature of 25℃. Each detection unit 1 synchronously collects the current, voltage and speed data of the corresponding unloaded motor 11. The calibration is repeated 3 times or more until the error between the collected data and the theoretical parameters of the motor 11 is less than ±0.5%, thus completing the linkage matching between the detection unit 1 and the motor screening device.

[0040] S2: Set the test temperature. Based on the actual operating conditions of motor 11, set the temperature parameters of the high and low temperature test chamber. The low temperature is greater than or equal to -55℃ and less than or equal to +70℃. Control the temperature inside the test chamber to be constant within the set value ±2℃ for more than 8 hours. At the same time, based on the theoretical calculation data of the gear clutch load simulation structure of the motor screening device, set the torque parameters of the simulated load.

[0041] S3: When the electromagnetic clutch 12 of a single station of the motor screening device is closed, the corresponding motor 11 is powered on and started. The detection unit 1 of this station synchronously collects the current, voltage and speed data of the motor 11. The electromagnetic clutches 12 of other stations are in the open state, and the corresponding detection units 1 are in the standby state.

[0042] S4: Set the judgment criteria. Based on the various temperature data of the high and low temperature test chamber, preset the threshold values ​​for the current, voltage, and speed of motor 11. After compensating the data collected by the acquisition module 4 using the temperature drift compensation algorithm, compare it with the set threshold values. If any parameter of current, voltage, or speed exceeds the threshold, motor 11 is directly judged as unqualified and eliminated; if all parameters are within the preset threshold range, motor 11 is judged as qualified in the initial screening.

[0043] Following the process of steps S3 to S4, the electromagnetic clutches 12 of 16 stations are sequentially controlled by the electrical control system of the motor screening device to achieve automated polling detection of the 16 stations and complete the initial screening of all motors 11.

[0044] For motors 11 that pass the initial screening, a temperature cycling test is conducted in a high and low temperature test chamber, ranging from -55℃ to 25℃ to +70℃, for at least three cycles. The detection unit 1 continuously collects multi-parameter data (current, voltage, speed) of motor 11 throughout the entire cycle, recording any parameter mutations during the temperature switching process. If motor 11 exhibits no parameter mutations during the cycle, and all parameters remain within the preset threshold range, it is deemed ultimately qualified; if any parameter mutation occurs, it is deemed unqualified and discarded.

[0045] After all the workstations have completed their testing, the testing unit 1 automatically stores all the parameter data collected by all motors 11, the judgment results at each stage, and the parameter change curves. At the same time, it automatically generates a complete high and low temperature screening test report, which includes the number of qualified motors 11, the parameter details under each temperature condition, the cause of failure of unqualified motors 11, and the corresponding abnormal parameter data, so as to realize the full traceability of the test data.

[0046] Even after installing detection unit 1, the motor screening device can still detect torque.

[0047] In summary, the above description is merely a preferred embodiment of this specification and is not intended to limit the scope of protection of this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

[0048] The systems, apparatuses, modules, or units described in one or more of the above embodiments may be implemented by a computer chip or entity, or by a product having a certain function. A typical implementation device is a computer. Specifically, a computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or any combination of these devices.

[0049] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0050] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

Claims

1. A testing unit for testing motors in high and low temperature environments, wherein the motor is installed inside a high and low temperature test chamber, characterized in that, The detection unit includes: a sealed cavity, and a data acquisition module and a temperature compensation module disposed within the sealed cavity; The acquisition module and the motor are connected via shielded flexible wires. The acquisition module is used to acquire the voltage, current and speed of the motor. The temperature compensation module includes a temperature sensor and an operational amplifier. The temperature sensor is used to measure the temperature inside the sealed cavity and transmit the measured temperature inside the cavity to the operational amplifier. The operational amplifier has a preset temperature drift compensation algorithm, which compensates for the error in the acquisition module acquiring motor data at non-rated operating temperatures. The sealed cavity has an opening, and a protective membrane is provided at the opening. The protective membrane is a waterproof and breathable membrane used to balance the internal and external air pressure of the sealed cavity. A hydrophobic layer is provided on the inner surface of the sealed cavity. A heating auxiliary component is provided inside the sealed cavity. When the temperature inside the sealed cavity is lower than a preset condensation temperature threshold, the heating auxiliary component heats the cavity. When the temperature inside the sealed cavity is higher than the condensation temperature threshold, the heating auxiliary component does not heat the cavity.

2. The detection unit for testing motors in high and low temperature environments according to claim 1, characterized in that, The detection unit for testing motors in high and low temperature environments is mounted on a motor screening device. The motor screening device includes a power supply, a drive assembly, a passive assembly, and a base for mounting the drive assembly and the passive assembly. The drive assembly includes a pinion shaft, a pinion, and an electromagnetic clutch. The pinion is fixedly mounted on one end of the pinion shaft, and the other end of the pinion shaft is connected to the rotor end of the electromagnetic clutch. The stator end of the electromagnetic clutch is connected to the motor via a connecting shaft. The passive assembly includes a large gear shaft and a large gear. The large gear is fixedly mounted on the large gear shaft, and the large gear meshes with the pinion. A motor bracket is connected to the outer surface of the base, and the motor is fixedly connected to the motor bracket.

3. The detection unit for testing motors in high and low temperature environments according to claim 2, characterized in that, The testing unit for testing motors in high and low temperature environments is mounted on the motor bracket.

4. The detection unit for testing motors in high and low temperature environments according to claim 3, characterized in that, It also includes a heat insulation pad, which is placed between the testing unit for testing motors in high and low temperature environments and the motor bracket. The heat insulation pad is used to block the heat from the testing unit for testing motors in high and low temperature environments from being conducted to the motor bracket.

5. The detection unit for testing motors in high and low temperature environments according to claim 1, characterized in that, The acquisition module includes a power supply terminal and a signal terminal; the power supply terminal is connected to the power supply of the motor screening device; and the signal terminal is connected to the motor.

6. The detection unit for testing motors in high and low temperature environments according to claim 1, characterized in that, The temperature sensor is an NTC thermistor.

7. The detection unit for testing motors in high and low temperature environments according to claim 4, characterized in that, The heat insulation pad is made of silicone material with a thickness of 2mm or more and 3mm or less, and a temperature tolerance range of -55℃ or more and +125℃ or less.

8. The detection unit for testing motors in high and low temperature environments according to claim 1, characterized in that, The heating element is a ceramic heating element with a power of less than 5W.

9. The detection unit for testing motors in high and low temperature environments according to claim 1, characterized in that, The temperature drift compensation algorithm is expressed as follows: ； in: These are the standard parameter values ​​of the motor after compensation using the temperature drift compensation algorithm on the collected data. The acquisition module collects the original parameter values ​​of the motor in real time. To acquire the temperature drift coefficient of the acquisition module, This represents the real-time temperature inside the sealed cavity.

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