System for testing performance of air conditioning outdoor unit direct current motor

Abstract

The application relates to a system for testing the performance of a direct-current motor of an outdoor unit of an air conditioner. The device comprises a controller, a stepping motor, a coupling and a testing device. The testing device comprises an LCR digital bridge. The coupling comprises a to-be-tested connecting end and a power connecting end. The to-be-tested connecting end is used for connecting a rotating shaft of a to-be-tested direct-current motor. The power connecting end is used for connecting the stepping motor. The controller is electrically connected with the stepping motor and the testing device respectively. The controller controls the stepping motor to drive the to-be-tested direct-current motor to rotate at a preset amplitude and frequency. The inductance data of the to-be-tested direct-current motor is measured by the LCR digital bridge in the testing device. The scheme provided by the application can drive the main shaft of the to-be-tested motor by the stepping motor, can realize accurate control of the rotating amplitude and the rotating frequency, can make the parameters of the to-be-tested motor obtained by the test more real, and can increase the accuracy of the detection of the to-be-tested motor.

Description

Technical Field

[0001] This application relates to the field of motor testing technology, and in particular to a system for testing the performance of DC motors used in air conditioning outdoor units. Background Technology

[0002] Following the release of the new national standard for household air conditioners, air conditioner fan motors are gradually replacing AC motors with all-DC motors. Currently, the three key performance parameters (resistance, back electromotive force, and AC / DC inductance) of the outdoor unit DC motor (without Hall effect sensors and controller) urgently require improved and optimized testing methods.

[0003] The original testing method involved using different instruments to test various data separately, frequently changing fixtures and instruments, and the data accuracy was low.

[0004] When testing the inductance parameters of a motor, the tester needs to manually crank the main shaft of the motor under test to cut magnetic field lines and generate inductance. During the test, the tester needs to rely on the approximate rotation range by feel and cannot have precise control over the rotation range. As a result, the accuracy of the measured inductance parameter data will inevitably have errors. Summary of the Invention

[0005] To overcome the problems existing in related technologies, this application provides a device for testing the performance of a DC motor in an air conditioner outdoor unit. This device can drive the spindle of the motor under test through a stepper motor, thereby achieving precise control of the rotation amplitude and rotation frequency, making the parameters of the motor under test more realistic, and thus increasing the accuracy of the test of the motor under test.

[0006] This application provides a system for testing the performance of a DC motor in an air conditioner outdoor unit, characterized in that it includes: a controller, a stepper motor, a coupling, and a testing device. The testing device includes an LCR digital bridge. The coupling includes a test connection end and a power connection end; the test connection end is used to connect to the shaft of the DC motor under test. The power connection end is used to connect to the stepper motor. The controller is electrically connected to both the stepper motor and the testing device, controlling the stepper motor to drive the DC motor under test to rotate at a preset amplitude and frequency, and measuring the inductance data of the DC motor under test through the LCR digital bridge in the testing device.

[0007] In one embodiment, the system for testing the performance of the DC motor of the outdoor unit of the air conditioner further includes a drive motor. The testing device further includes an electrical parameter meter. The controller is electrically connected to both the drive motor and the testing device, controlling the drive motor to continuously adjust its speed using PWM to drive the DC motor under test to rotate at a preset speed, and measuring the back electromotive force data of the DC motor under test using the electrical parameter meter in the testing device.

[0008] In one embodiment, the drive motor includes a drive power output end and a transmission end. The drive power output end is connected to the power connection end of the coupling. The stepper motor includes a stepping power output end; the stepping power output end is connected to the transmission end of the drive motor via a gear structure.

[0009] In one embodiment, the drive motor includes a drive power output terminal. The stepper motor includes a stepping power output terminal. The power connection terminal of the coupling includes at least two power connection ports, one power connection port being connected to the stepping power output terminal of the stepper motor, and the other power connection port being connected to the drive power output terminal of the drive motor.

[0010] In one embodiment, the system for testing the performance of a DC motor in an air conditioner outdoor unit further includes a first slide rail and a second slide rail. The first slide rail and the second slide rail are respectively disposed on both sides of the stepper motor. The stepper motor is connected to the first slide rail and the second slide rail via sliding bearings, enabling the stepper motor to move along the slide rails and control the engagement and disengagement of the gear structure between the stepper motor's power output end and the drive motor's transmission end.

[0011] In one embodiment, the testing apparatus further includes an impedance meter. The impedance meter is used to measure the resistance data of the DC motor under test.

[0012] In one embodiment, the controller, the stepper motor, the drive motor, and the testing device are disposed inside a test workbench. The outer surface of the test workbench includes: a coupling 401, an emergency stop switch 501, a terminal interface 502, a stop switch 503, a tachometer 504, a start switch 505, a speed control knob 506, a display 507, and a buzzer 508.

[0013] In one embodiment, the UVW connector terminal of the DC motor under test is connected to the interior of the test bench and the test device through the terminal interface.

[0014] In one embodiment, the speed control knob adjusts the rotational speed of the drive motor. The tachometer displays the rotational speed of the DC motor under test.

[0015] A second aspect of this application provides a method for performing a system-wide test of the performance of a DC motor in an air conditioner outdoor unit. The method includes: controlling the operation of a stepper motor and a drive motor according to the test progress, and controlling the connection between the terminal interface and different testing instruments within the testing device. The test data of the DC motor under test is recorded, analyzed, and displayed on a tachometer and a display.

[0016] The technical solution provided in this application may include the following beneficial effects: the present invention drives the spindle of the motor under test by a stepper motor, which can achieve precise control of the rotation amplitude and rotation frequency, making the parameters of the motor under test obtained by the test more realistic, thereby increasing the accuracy of the test of the motor under test.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0019] Figure 1 This is a front view of the stepper motor and drive motor mounting as shown in the embodiments of this application;

[0020] Figure 2 This is a side view showing the installation of the stepper motor and drive motor in an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the test workbench shown in an embodiment of this application. Detailed Implementation

[0022] Preferred embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0023] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0024] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] Example 1.

[0026] To address the issue of inaccurate inductance parameter measurements due to the inability to precisely control the rotation amplitude, which requires a rough feel from the operator, this application provides a device for testing the performance of a DC motor in an air conditioner outdoor unit. By driving the spindle of the motor under test with a stepper motor, precise control of the rotation amplitude and frequency is achieved, resulting in more accurate parameters and increased testing accuracy. Furthermore, the use of a PWM (Pulse Width Modulation) drive motor allows for stepless speed adjustment of the motor under test, and a structure combining the stepper motor and the drive motor is provided.

[0027] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0028] refer to Figure 1 , Figure 1 This is a front view of the installation of a stepper motor and a drive motor shown in an embodiment of this application. The stepper motor 10 shown includes a stepper power output terminal 101, which is connected to the drive motor transmission terminal 202 via gears. The drive motor includes a drive power output terminal 201 and a transmission terminal 202. A coupling 401 is sleeved on the drive power output terminal 201 and is directly connected to the power connection terminal 4012 of the coupling 401.

[0029] Figure 2This is a side view of the installation of the stepper motor and drive motor shown in the embodiment of this application. The figure shows the first slide rail 301 and the second slide rail 302. The first slide rail 301 and the second slide rail 302 are respectively arranged on both sides of the stepper motor 10. The stepper motor 10 is connected to the first slide rail 301 and the second slide rail 302 through two sliding bearings 303 on each side. The stepper power output 101 end and the drive end 202 of the drive motor can be transmitted through the set of gears 60. The translation and sliding of the stepper motor 10 on the slide rail can be completed by controlling the push rod. The meshing and disengagement between the gear on the stepper power output 101 end and the gear set on the drive end 202 of the drive motor can be controlled to realize the transmission and disengagement between the stepper power output 101 end and the power connection end 4012 of the coupling.

[0030] The process for testing the performance of the DC motor in an air conditioner outdoor unit involves the controller being electrically connected to both a stepper motor and the testing device. The stepper motor drives the DC motor under test (DUT) to rotate at a preset amplitude and frequency. The inductance data of the DUT is measured using an LCR digital bridge in the testing device. LCR refers to L (inductance), R (resistance), and C (capacitance). The controller is also electrically connected to both the drive motor and the testing device. The drive motor uses PWM (Pulse Width Modulation) for stepless speed regulation, driving the DUT to rotate at a preset speed. The back electromotive force (EMF) data of the DUT is measured using an electrical parameter meter in the testing device. Finally, the controller is electrically connected to an impedance meter in the testing device, which is used to measure the resistance data of the DUT.

[0031] The parameters of the motor under test obtained from the test are input into the industrial computer in the controller for processing. The parameters are compared with the preset standard parameters to obtain the test results of the motor under test, which are displayed on the display. If the parameters of the motor under test do not meet the standard, the buzzer will sound an alarm.

[0032] For structures that combine stepper motors and drive motors, this embodiment also provides a coupling with at least two power connection ports, which are directly connected to the power output terminals of both the stepper motor and the drive motor. In this case, the stepper motor is not connected to the drive motor, and the transmission between the gears on the shaft of the drive motor and the coupling is not relied on. The disconnection and connection of the coupling are controlled to achieve separate control of the stepper motor and the drive motor.

[0033] This embodiment uses a stepper motor to precisely control the rotation amplitude and frequency of the motor under test. Compared to relying on manual cranking, this method provides more accurate data measurement and more realistic test results. Furthermore, the PWM stepless speed-regulating drive motor employed can meet the driving test requirements of motors under test with different speed requirements, increasing the versatility of the testing system.

[0034] Example 2.

[0035] Figure 3 This is a schematic diagram of the test workbench shown in an embodiment of this application.

[0036] See Figure 3 , Figure 3 Inside the test bench 50, there is a controller, a stepper motor 10, a drive motor 20, and a testing device. The control unit consists of an industrial computer, a drive motor power supply, a stepper motor power supply, and various relays and other control devices. It controls the testing device to execute tests through different timing sequences and returns the test data to the industrial computer. The controller inside the system is controlled by an industrial computer through serial ports to control the resistance testing unit, the quadrature-axis inductance testing unit, and the back EMF testing unit. It tests and collects the required data and returns it to the industrial computer. The industrial computer then processes and analyzes the parameters of the motor under test, and calculates or displays the resistance, quadrature-axis inductance, and back EMF coefficients that need to be measured using software formulas.

[0037] The test bench 50 includes the following components: coupling 401, emergency stop switch 501, terminal interface 502, stop switch 503, tachometer 504, start switch 505, speed control knob 506, display 507, and buzzer 508. The UVW connector terminals of the DC motor under test, where UVW represents the three windings of a three-phase motor, are connected to the interior of the test bench via the terminal interface 502 and connected to the testing device.

[0038] The tester can adjust the speed of the drive motor 20 using the speed control knob 506, while the tachometer 504 displays the speed of the DC motor under test, allowing the tester to intuitively grasp the speed of the DC motor under test. The system test is started by the start switch 505 and stopped by the stop switch 503. The display 507 shows various data and test results, and the emergency stop switch 501 can force a shutdown in an emergency. If the data of the motor under test on the test bench does not meet the standards, the buzzer 508 will sound an alarm to alert the tester.

[0039] Existing testing methods require the use of different instruments to test various data of the DC motor under test, involving frequent changes of fixtures and instruments, which is very cumbersome. The test bench in this embodiment uses an internal impedance tester, LCR digital bridge, and electrical parameter meter to collect test data, and a controller is set up to analyze the various parameters of the DC motor under test and derive the test results. The test data is calculated and displayed by an industrial control computer and software, achieving integrated testing. After connecting the shaft of the motor under test to the coupling, the tester connects the UVW connector terminals to the terminal interface, and starts the system. This allows for testing of all data of the motor under test with only one setup, without the need to change the testing equipment, greatly reducing the workload of the tester. Furthermore, the use of replaceable couplings allows connection of motors under test with shafts of different diameters, achieving universality.

[0040] Example 3.

[0041] Corresponding to the aforementioned application function implementation method embodiments, this application also provides a system execution method for testing the performance of DC motors in outdoor units of air conditioners, and corresponding embodiments.

[0042] The system execution method of this embodiment can control the test process and, according to the current test process, control the terminal interface to connect to the impedance tester, LCR digital bridge and electrical parameter meter in the test device respectively. At the same time, it controls the movement of the stepper motor on the slide rail, records the test data of the DC motor under test, analyzes it with a set formula, and displays it on the tachometer and the display.

[0043] With the motor under test (DUT) not being driven, the impedance meter directly measures the resistance between each pair of the three phases (UVW) of the DUT's leads, and returns three sets of data to the computer. The stepper motor power supply drives the DUT, rotating it once every 30° and stopping for 3 seconds, while the LCR (Limited Circuit Rectifier) ​​is activated. After the motor stops, the inductance between each pair of the motor leads (UVW) is measured. This cycle is repeated 12 times, ensuring a full 360° rotation. Each of the 12 stops is considered one data set, and three sets of data are returned to the computer. The drive motor then drives the DUT at a set standard speed. An electrical parameter meter measures the effective voltage and frequency between each pair of the motor leads (UVW), and the effective voltage and frequency of the three outputs between UVW are measured twice, yielding two sets of data that are returned to the computer.

[0044] When testing a DC motor, the tester first connects and interlocks the motor under test (DUT) with the shaft of the drive motor using a coupling. Then, the UVW connector terminals of the DUT's leads are inserted into the input terminals on the surface of the test bench. After installation, the start button is pressed to power on the machine, and the controller inside the test bench begins to control the test according to the preset program.

[0045] The first step is to connect the leads of the motor under test to the impedance meter. The controller controls the impedance meter to test the resistance between each pair of UVW. After the test is completed, the impedance meter is disconnected from the motor under test and the test is stopped.

[0046] The second step involves connecting the leads of the motor under test to the LCR digital bridge. Powering on the stepper motor puts it into standby mode, and simultaneously activating the LCR digital bridge. The power supply drives the stepper motor to rotate 30° and then stops. The LCR bridge then begins testing the inductance between UV and UW, rotating one revolution to test 12 data points. The relays are then switched between UW and VW, testing a total of 36 data points. After completion, the LCR digital bridge is disconnected from the motor under test, and the test stops.

[0047] The third step involves connecting the leads of the motor under test to the electrical parameter analyzer, powering on the motor and putting it into standby mode, and simultaneously starting the electrical parameter analyzer. Then, adjust the speed control knob in conjunction with the speed displayed on the tachometer until the set standard speed for the test is reached. When the speed differs from the set speed by ±5 revolutions, the electrical parameter analyzer sequentially locks the effective voltage value and frequency data between the UVW outputs of the motor under test. After completion, the electrical parameter analyzer is disconnected from the motor under test, and the test is stopped.

[0048] The fourth step involves the industrial computer displaying the motor's resistance value from the received resistance data, calculating the direct and quadrature axis inductance from the received inductance data, and calculating the back electromotive force coefficient from the received effective voltage value and frequency data. The test data is then displayed on the screen and compared with the set standard values ​​to determine the appropriate conclusion. For motors that fail the test, a buzzer sounds an alarm.

[0049] The tester simply needs to install the motor under test on the test bench, observe the bench's operation and the tachometer on the monitor, and monitor the test results to complete the task. The pre-set test program automatically calculates and tests the motor's data, making the process quick, convenient, and significantly improving the efficiency of motor testing.

[0050] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A system for testing the performance of a DC motor in an air conditioner outdoor unit, characterized in that, include: The controller, stepper motor (10), coupling (401), and testing device; The testing device includes: an LCR digital bridge; The coupling includes a test connection end (4011) and a power connection end (4012); the test connection end (4011) is used to connect the shaft of the DC motor under test; the power connection end (4012) is used to connect the stepper motor (10). The controller is electrically connected to the stepper motor (10) and the test device respectively, controls the stepper motor (10) to drive the DC motor under test to rotate at a preset amplitude and frequency, and measures the inductance data of the DC motor under test through the LCR digital bridge in the test device. The system further includes: a drive motor (20); the drive motor (20) includes: a drive power output end (201) and a transmission end (202); the drive power output end (201) is connected to the power connection end (4012) of the coupling (401); the stepper motor (10) includes: a stepper power output end (101); the stepper power output end (101) is connected to the transmission end (202) of the drive motor via gears; The system also includes: a first slide rail (301) and a second slide rail (302); The first slide rail (301) and the second slide rail (302) are respectively disposed on both sides of the stepper motor; The stepper motor is connected to the first slide rail (301) and the second slide rail (302) via a sliding bearing, so that the stepper motor can move along the slide rail and control the engagement and disengagement of the gear set (60) between the stepper power output end and the transmission end of the drive motor.

2. The system for testing the performance of the DC motor of an air conditioner outdoor unit according to claim 1, characterized in that, The testing device also includes: an electrical parameter meter; The controller is electrically connected to the drive motor (20) and the test device respectively, and controls the drive motor (20) to steplessly adjust its speed in the manner of pulse width modulation (PWM) to drive the DC motor under test to rotate at a preset speed, and measures the back electromotive force data of the DC motor under test through the electrical parameter instrument in the test device.

3. The system for testing the performance of the DC motor of an air conditioner outdoor unit according to claim 2, characterized in that, The drive motor includes: a drive power output end; The stepper motor includes: a stepper power output terminal; The power connection end of the coupling includes at least two power connection ports, one of which is connected to the stepping power output end of the stepper motor, and the other of which is connected to the driving power output end of the drive motor.

4. The system for testing the performance of the DC motor of an air conditioner outdoor unit according to claim 1, characterized in that, The testing apparatus also includes: an impedance meter; The impedance meter is used to test the resistance data of the DC motor under test.

5. The system for testing the performance of the DC motor of an air conditioner outdoor unit according to claim 2, characterized in that, The controller, the stepper motor (10), the drive motor (20) and the testing device are arranged inside the testing workbench (50); The test workbench (50) includes the following components: a coupling (401), an emergency stop switch (501), a terminal interface (502), a stop switch (503), a tachometer (504), a start switch (505), a speed control knob (506), a display (507), and a buzzer (508).

6. The system for testing the performance of the DC motor of an air conditioner outdoor unit according to claim 5, characterized in that: The UVW connector terminal of the DC motor under test is connected to the interior of the test bench through the terminal interface (502) and connected to the test device.

7. The system for testing the performance of the DC motor of an air conditioner outdoor unit according to claim 5, characterized in that: The speed control knob (506) is used to adjust the speed of the drive motor (20); The tachometer (504) is used to display the speed of the DC motor under test.

8. The system for testing the performance of a DC motor in an air conditioner outdoor unit according to claim 6, characterized in that, The methods executed by the system include: According to the test process, control the operation of the stepper motor and drive motor, and control the connection between the terminal interface (502) and different test instruments in the test device; The data obtained from the test of the DC motor under test is recorded and analyzed, and the relevant data is displayed on the tachometer (504) and the display (507).

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