Motor temperature rise testing device and system

Abstract

The utility model provides a motor temperature rise testing device and system, and relates to the technical field of motor testing, a thermistor of the device is installed inside a motor to be tested, and an infrared thermometer is arranged opposite to a housing of the motor to be tested; the current sensor is connected with a stator coil of the to-be-tested motor; the main controller receives the motor stator current collected by the current sensor and the motor internal temperature collected by the thermistor, and carries out a temperature rise test according to the motor current and the motor internal temperature. According to the embodiment of the utility model, the temperature rise of the motor can be automatically tested without manual intervention, so that the test efficiency is improved; the temperature rise condition of the motor is automatically calculated, errors possibly existing in a traditional temperature measurement method are avoided, and the test accuracy is improved; through the man-machine interaction device, the temperature rise test of the motor under different conditions can be realized, and the operation is convenient. The temperature rise of the motor is monitored in real time, the potential overheating problem is found and processed in time, and motor faults are effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of motor testing, and in particular to a motor temperature rise testing device and system. Background Art

[0002] During the operation of the motor, its temperature will rise due to the conversion of electrical energy into heat energy. The temperature rise of the motor not only affects the performance of the motor, but also may cause damage to the motor. The temperature rise of the motor is one of the important indicators to measure the performance of the motor. Accurate temperature rise testing is essential for the design and use of the motor. However, the existing temperature rise test devices are often complex in structure, cumbersome to operate, and cannot accurately measure the temperature rise of the motor under different conditions. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a motor temperature rise test device, including a human-machine interaction device, a main controller, a signal generating board, a linear amplifier, a current sensor, a thermistor and an infrared thermometer; the main controller is connected to the human-machine interaction device, the signal generating board, the current sensor and the thermistor; the thermistor is installed inside the motor to be tested; the current sensor is connected to the stator coil of the motor to be tested; the human-machine interaction device is connected to the infrared thermometer, and the infrared thermometer is arranged opposite to the shell of the motor to be tested; the signal generating board is used to receive the control instruction sent by the main controller and generate the waveform required to control the operation of the motor to be tested, and output it to the stator of the motor to be tested after amplification by the linear amplifier; the main controller is used to receive the motor stator current collected by the current sensor and the motor internal temperature collected by the thermistor, and calculate the motor temperature rise curve according to the motor stator current and the motor internal temperature; the human-machine interaction device is used to receive and display the motor surface temperature collected by the infrared thermometer, and display the temperature rise test result.

[0004] Optionally, the main controller is a programmable logic controller, and the programmable logic controller communicates with the human-computer interaction device and the infrared thermometer via a network port transmission control protocol.

[0005] Optionally, the programmable logic controller includes an analog output module, a digital output module and an analog input module.

[0006] Optionally, a linear driver is further included, and the linear driver includes an analog input port; the analog input port collects the waveform signal generated by the signal generating board and amplifies it to drive the motor stator.

[0007] Optionally, the current sensor is a Hall sensor or a fluxgate sensor.

[0008] Optionally, the main controller is a digital signal processor or a microcontroller.

[0009] Optionally, the signal generating board adopts a field programmable logic array, a complex programmable logic device or an application integrated circuit with a pulse width modulation output function.

[0010] Optionally, the linear amplifier is an operational amplifier or a power amplifier.

[0011] Optionally, the human-computer interaction device includes a current command input module and a touch display screen.

[0012] The embodiment of the utility model provides a motor temperature rise test system, comprising the above-mentioned motor temperature rise test device and a motor fixing device; the motor fixing device is used for fixing and installing the motor to be tested.

[0013] The motor temperature rise testing device and system provided by the embodiment of the utility model can automatically test the temperature rise of the motor without manual intervention, thereby improving the test efficiency; by collecting the internal thermistor signal of the motor and the current flowing through the stator coil of the motor, the temperature rise of the motor is calculated in combination with the physical characteristics of the motor, thereby avoiding the errors that may exist in the traditional temperature measurement method and improving the accuracy of the test; different current instructions can be set through the human-computer interaction device to realize the test of the motor temperature rise under different conditions, and the operation is convenient; the real-time monitoring of the motor temperature rise is realized, the potential overheating problem is discovered and dealt with in time, and the motor failure is effectively prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0015] Figure 1 It is a structural schematic diagram of a motor temperature rise testing device in an embodiment of the utility model. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0017] The embodiment of the utility model provides a motor temperature rise test device, which includes a human-computer interaction device, a main controller, a current sensor, a thermistor and an infrared thermometer.

[0018] The main controller is connected to the human-machine interaction device, the current sensor and the thermistor. The thermistor is used to detect the temperature of the motor. The thermistor can sensitively detect the temperature change inside the motor and transmit the data to the main controller.

[0019] The human-machine interaction device is connected to the infrared thermometer, and the infrared thermometer is arranged relative to the shell of the motor to be tested. Specifically, the human-machine interaction device may include a human-machine interface, which communicates with the main controller and the infrared thermometer through the TCP / IP (Transmission Control Protocol / Internet Protocol) protocol, and can read the temperature data detected by the infrared thermometer. The human-machine interface can accept instructions input by the user and transmit the instructions to the main controller. At the same time, the interface can also display test results and real-time data. The infrared thermometer can measure the surface temperature of the motor. The infrared thermometer can measure the surface temperature of the motor non-contactly and transmit the data to the human-machine interface for display or storage. The current sensor is connected to the stator coil of the motor to be tested. The current sensor is used to collect the current flowing through the stator coil of the motor, can monitor the current change of the motor in real time, and transmit the data to the main controller.

[0020] The human-machine interaction device is used to receive and display the motor surface temperature collected by the infrared thermometer, and to display the temperature rise test result. Optionally, the human-machine interaction device may include a current instruction input module and a touch display screen.

[0021] The signal generation board can receive the control instructions sent by the main controller and generate the waveform required to control the operation of the motor to be tested, and output it to the stator of the motor to be tested after being amplified by the linear amplifier.

[0022] Among them, the signal generation board can generate the waveform required to control the operation of the motor according to the control instruction, and the waveform is amplified by the linear amplifier and output to the stator of the motor to be tested. The signal generation board can generate different waveforms to simulate the running state of the motor under different loads and speeds. The linear amplifier can amplify the waveform required to control the operation of the motor generated by the signal generation board. The linear amplifier can increase the amplitude of the waveform so that it can drive the stator of the motor to be tested.

[0023] The main controller is used to receive the motor stator current collected by the current sensor and the motor internal temperature collected by the thermistor, and to perform temperature rise test based on the motor current and motor internal temperature. The main controller is responsible for collecting the internal thermistor signal of the motor and the current flowing through the motor stator coil. The main controller can control the operation of the motor according to the current command and other parameters set by the user, and collect relevant temperature and current data.

[0024] The main controller can calculate the temperature rise of the motor based on the collected internal thermistor signal of the motor and the current data flowing through the motor stator coil, combined with the physical characteristics of the motor.

[0025] The main controller calculates the temperature rise of the motor based on the thermistor signal and the current flowing through the motor stator coil, combined with the physical characteristics of the motor (such as the motor's power, thermal resistance, heat capacity, mass and other parameters), avoiding possible errors in traditional temperature measurement methods and improving test accuracy.

[0026] The motor temperature rise testing device provided by the embodiment of the utility model can automatically test the temperature rise of the motor without manual intervention, thereby improving the test efficiency; by collecting the internal thermistor signal of the motor and the current flowing through the stator coil of the motor, the temperature rise of the motor is calculated in combination with the physical characteristics of the motor, thereby avoiding the errors that may exist in the traditional temperature measurement method and improving the accuracy of the test; different current instructions can be set through the human-computer interaction device to realize the test of the motor temperature rise under different conditions, and the operation is convenient; the real-time monitoring of the motor temperature rise is realized, the potential overheating problem is discovered and dealt with in time, and the motor failure is effectively prevented.

[0027] In this embodiment, different current instructions can be set through the human-machine interface. The user can input the current instruction on the interface, and transmit the instruction to the main controller through the TCP / IP protocol.

[0028] Exemplarily, the main controller is a programmable logic controller (PLC), which communicates with the human-computer interaction device and the infrared thermometer through a network port transmission control protocol. Specifically, it includes an analog output module, a digital output module and an analog input module. The PLC uses its internal analog output module and digital output module to implement the issuance of control instructions for the signal generation board, and uses the analog input module to collect the output signal of the current sensor and the thermistor value of the motor.

[0029] Optionally, a linear driver is also included, which includes an analog input port. The analog input port is used to collect the waveform signal generated by the signal generating board and amplify the waveform signal to drive the motor stator.

[0030] The main controller sends a control signal instruction to the signal generating board according to the set current instruction. The main controller generates a control signal according to the current instruction and other parameters input by the user, and sends the signal to the signal generating board.

[0031] The signal generation board generates the waveform required to control the operation of the motor according to the control instruction. After receiving the control signal, the signal generation board generates the corresponding waveform and outputs it to the linear amplifier. The linear amplifier amplifies the waveform and outputs it to the stator of the motor to be tested. The linear amplifier amplifies the waveform and outputs it to the stator of the motor to be tested to drive it to operate.

[0032] The main controller collects the NTC (Negative Temperature Coefficient thermistor) thermistor signal inside the motor and the current flowing through the motor stator coil at the same time. The main controller collects relevant temperature and current data through the current sensor and NTC thermistor. The main controller can calculate the temperature rise curve of the motor based on the collected temperature, current and other data.

[0033] The human-machine interface reads the temperature data detected by the infrared thermometer. The infrared thermometer measures the surface temperature of the motor non-contactly and transmits the data to the human-machine interface for display or storage.

[0034] The main controller compares the calculated temperature rise curve with the preset safety threshold and issues an alarm if the temperature rise exceeds the safety threshold. If the calculated temperature rise curve exceeds the preset safety threshold, the main controller can issue an alarm to prompt the user to take action.

[0035] During the test, the test data, including current, voltage, temperature, etc., can be viewed in real time through the human-machine interface. Users can stop the test or change the test parameters at any time as needed. After the test, the main controller will automatically save the test data and generate a report. Users can view the test results or export the test data through the human-machine interface.

[0036] Figure 1 This is a schematic diagram of the structure of a motor temperature rise test device provided by an embodiment of the utility model. For example, Figure 1 The figure shows that the motor temperature rise test device includes a human-machine interface, a main controller, a signal generating board, a linear amplifier, a current sensor, a motor stator and NTC, an infrared thermometer and other parts.

[0037] Among them, the main controller is implemented by control chips or modules such as PLC, DSP (Digital Signal Process) or microcontroller. The signal generation board is implemented by chips such as FPGA (Field Programmable Gate Array), CPLD (Complex Programmable logic device) or ASIC (Application Specific Integrated Circuit) with PWM (Pulse Width Modulation) output function. The linear amplifier is implemented by operational amplifiers, power amplifiers, etc. The current sensor is implemented by Hall sensors, fluxgate sensors, etc. NTC thermistors are selected with high sensitivity, fast response and good stability.

[0038] In this embodiment, different current instructions are set through the human-machine interface. The user can input the current instruction on the interface, and transmit the instruction to the main controller through the TCP / IP protocol. The current instruction can be a value that simulates the operating state of the motor under different loads and speeds. For example, the user can set a 5 ampere current instruction to indicate that the motor is running under light load, a 10 ampere current instruction to indicate that the motor is running under rated load, and so on.

[0039] The main controller sends a control signal instruction to the signal generating board according to the set current instruction. The main controller generates a control signal according to the current instruction and other parameters input by the user, and sends the signal to the signal generating board.

[0040] The signal generation board generates the waveform required to control the operation of the motor according to the control instructions and outputs it to the stator of the motor to be tested after being amplified by the linear driver. After receiving the control signal, the signal generation board generates the corresponding waveform and outputs it to the linear amplifier. The waveform can be in various forms such as PWM signal, square wave signal, etc., which can be selected according to actual needs. This step realizes the drive and control of the motor.

[0041] By setting different current instructions through the human-machine interface, the temperature rise of the motor can be detected through the above-mentioned generation and measurement device. By setting different current instructions through the human-machine interface, the simulation and control of different loads and speeds of the motor can be realized, and then the detection and analysis of the temperature rise of the motor can be realized. This step realizes the detection and analysis function of the motor temperature rise.

[0042] Exemplarily, the implementation steps of the motor temperature rise test are as follows:

[0043] 1. Preparation stage: Assemble the human-machine interface, main controller, signal generation board, linear amplifier, current sensor, motor stator and NTC, infrared thermometer and other parts according to Figure 1 Connect as shown and ensure it works properly. Connect the human-machine interface to the main controller and infrared thermometer through TCP / IP protocol to achieve data transmission and control.

[0044] 2. Set current command: Set different current commands through the human-machine interface. The current command range can be set according to actual needs.

[0045] 3. Start the test: The main controller sends a control signal instruction to the signal generating board according to the set current instruction. The signal generating board generates the waveform required to control the operation of the motor according to the control instruction, and outputs it to the stator of the motor to be tested after being amplified by the linear driver.

[0046] 4. Data collection: During the operation of the motor, the main controller collects the NTC thermistor signal inside the motor and the current data flowing through the motor stator coil in real time, and detects the surface temperature data of the motor through an infrared thermometer.

[0047] 5. Temperature rise calculation: Based on the collected NTC thermistor signal inside the motor and the current data flowing through the motor stator coil, combined with the physical characteristics of the motor, the temperature rise of the motor is calculated.

[0048] 6. Result display: The calculated motor temperature rise is transmitted to the human-machine interface through the TCP / IP protocol for display, and the data can also be stored for subsequent analysis and processing.

[0049] When the motor temperature rise test device of the utility model is implemented, the user can input the test instructions and parameters, including current instructions, test time, etc., through the human-machine interface. After receiving the instructions, the main controller sends a control signal to the signal generating board to generate a corresponding waveform signal. The signal generator can generate a three-phase sinusoidal signal with the same amplitude but a phase difference of 120°. After the waveform signal is amplified by the linear amplifier, it is output to the stator of the motor to be tested to drive the motor to run.

[0050] During the operation of the motor, the current sensor monitors the current flowing through the stator coil of the three-phase motor in real time and transmits the data to the main controller. n (n=1, 2, 3), the main controller PLC detects the output voltage of the current sensor and calculates the current I flowing through the motor stator according to the formula n =U n / R*K, where R is the load at the output end of the current sensor and K is the current sensor ratio. At the same time, the NTC thermistor inside the motor stator detects the temperature of the motor, and the main controller PLC detects the NTC resistance Rntc , and according to the formula R ntc =R 0 expB(1 / T in -1 / T 0 ) Calculate the temperature T inside the motor stator in , where B = ln(R in / R 0 ) / (1 / T-1 / T 0 ), R 0 At temperature T 0 The resistance value of the NTC is as follows (check the NTC specification). The infrared thermometer measures the surface temperature of the motor non-contactly to obtain the maximum surface temperature T of the motor. out The main controller calculates the temperature rise of the motor based on the collected temperature and current data, and calculates the internal temperature T of the stator coil at the steady state under different current amplitudes. in , draw the temperature rise curve inside the motor stator. Similarly, draw the temperature rise curve outside the motor stator based on the temperature data collected by the infrared thermometer, and display the results on the human-machine interface. Users can view the test results and real-time data through the interface to keep abreast of the motor's operating status and temperature rise.

[0051] The motor temperature rise test device of the utility model can also select a variety of test modes. For example, the user can select a constant current test mode, that is, keep the current of the motor stator coil constant and test the temperature rise of the motor at different time points; or select a variable current test mode, that is, adjust the current of the motor stator coil according to a preset current change curve to test the temperature rise of the motor under different loads.

[0052] In addition, the above motor temperature rise test device can also perform fault warning and diagnosis. When it is detected that the motor temperature is too high or the current is abnormal, the system will issue a warning prompt so that the user can take timely measures to prevent motor damage.

[0053] The motor temperature rise test device provided by the embodiment of the utility model has the following advantages:

[0054] 1. High degree of automation: Through the cooperation of main controller, signal generation board, linear amplifier, current sensor, motor stator and NTC, infrared thermometer and other components, the automatic test of motor temperature rise is realized. No manual intervention is required, which improves the test efficiency.

[0055] 2. High accuracy: By collecting the NTC thermistor signal inside the motor and the current flowing through the motor stator coil, combined with the physical characteristics of the motor, the temperature rise of the motor is calculated. This avoids the errors that may exist in traditional temperature measurement methods and improves the accuracy of the test.

[0056] 3. Easy operation: By setting different current instructions through the human-machine interface, the temperature rise test of the motor under different conditions can be realized. The interface is friendly, the operation is simple, and it is convenient for users to use.

[0057] 4. Real-time monitoring: It can realize real-time monitoring of motor temperature rise, timely discover and deal with potential overheating problems, and effectively prevent motor failures.

[0058] 5. Wide application: The motor temperature rise test device and method can be widely used in various types of motor tests, such as DC motors, AC motors, stepper motors, etc. It has a wide range of practical application value.

[0059] 6. Convenient data processing: The test data is transmitted to the human-machine interface for display through the TCP / IP protocol, and can be stored for subsequent analysis and processing, which improves data processing efficiency.

[0060] The embodiment of the utility model provides a motor temperature rise test system, comprising the above-mentioned motor temperature rise test device and a motor fixing device, wherein the motor fixing device is used for fixing and installing the motor to be tested.

[0061] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

[0062] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0063] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0064] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A motor temperature rise test device, characterized in that: It includes a human-computer interaction device, a main controller, a signal generation board, a linear amplifier, a current sensor, a thermistor and an infrared thermometer; The main controller is connected to the human-machine interaction device, the signal generating board, the current sensor and the thermistor; the thermistor is installed inside the motor to be tested; the current sensor is connected to the stator coil of the motor to be tested; The human-machine interaction device is connected to the infrared thermometer, and the infrared thermometer is arranged opposite to the housing of the motor to be tested; The signal generating board is used to receive the control instruction sent by the main controller and generate the waveform required to control the operation of the motor to be tested, and output it to the stator of the motor to be tested after being amplified by the linear amplifier; The main controller is used to receive the motor stator current collected by the current sensor and the motor internal temperature collected by the thermistor, and calculate the motor temperature rise curve according to the motor stator current and the motor internal temperature; The human-computer interaction device is used to receive and display the motor surface temperature collected by the infrared thermometer, and to display the temperature rise test result.

2. The motor temperature rise test device according to claim 1, characterized in that: The main controller is a programmable logic controller, and the programmable logic controller communicates with the human-computer interaction device and the infrared thermometer through a network port transmission control protocol.

3. The motor temperature rise test device according to claim 2, characterized in that: The programmable logic controller comprises an analog output module, a digital output module and an analog input module.

4. The motor temperature rise test device according to claim 1, characterized in that: Also included is a linear driver, the linear driver including an analog input port; The analog input port collects the waveform signal generated by the signal generating board and amplifies it to drive the motor stator.

5. The motor temperature rise test device according to claim 1, characterized in that: The current sensor is a Hall sensor or a fluxgate sensor.

6. The motor temperature rise test device according to claim 1, characterized in that: The main controller is a digital signal processor or a microcontroller.

7. The motor temperature rise test device according to claim 1, characterized in that: The signal generation board card adopts a field programmable logic array, a complex programmable logic device or an application integrated circuit with a pulse width modulation output function.

8. The motor temperature rise test device according to claim 1, characterized in that: The linear amplifier is an operational amplifier or a power amplifier.

9. The motor temperature rise test device according to claim 1, characterized in that: The human-computer interaction device comprises a current instruction input module and a touch display screen.

10. A motor temperature rise test system, characterized in that: It comprises the motor temperature rise test device and the motor fixing device as described in any one of claims 1 to 9; the motor fixing device is used for fixing and installing the motor to be tested.

Images