Three-phase connection sequence correct / incorrect detection device for permanent magnet synchronous servo motor

Abstract

The application discloses a three-phase wiring sequence correct / incorrect detection device of a permanent magnet synchronous servo motor, which adopts a decoding module to drive a resolver and obtains angle position data through resolver signals output by the resolver. The permanent magnet synchronous servo motor is driven and controlled through a driving and control module, and according to the position data corresponding to the press-on connection of the upshift or downshift, the control LED indicator light displays red or green. Meanwhile, the gear position is recorded by a gear display Nixie tube. The permanent magnet synchronous servo motor relaxation position is found through the LED indicator light, and whether the gear position displayed by the gear display Nixie tube meets the requirements is determined according to the color change of the LED indicator light and the gear display Nixie tube. If yes, the three-phase wiring sequence is correct, otherwise, the three-phase wiring sequence is incorrect, and the wiring sequence should be changed and retested. The application only needs to record or observe the color change of the LED indicator light and whether the gear position displayed by the gear display Nixie tube meets the requirements to judge the three-phase wiring sequence correct / incorrect, and the measurement cost is low, and the detection speed and result accuracy are greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet synchronous servo motor technology, and more specifically, relates to a device for detecting the correctness of the three-phase wiring sequence of a permanent magnet synchronous servo motor. Background Technology

[0002] Permanent magnet synchronous servo motors (PMSMs) possess advantages such as high power factor, high efficiency, simple structure, reliable operation, small size, light weight, and low loss. They have been widely used in national defense, industrial and agricultural production, and daily life, achieving significant economic benefits. Rotary transformers (RTVs) are characterized by simple structure, sensitive operation, reliable performance, low environmental requirements (especially in high-temperature and high-dust environments), large output signal amplitude, and strong anti-interference capabilities, making them widely used in harsh working environments. The RTV on a PMSM can measure electrical signals such as position, angle, speed, and torque to achieve closed-loop control. The RTV outputs absolute analog signals, offering advantages in adapting to harsh environments and replacing single-turn absolute and incremental rotary optical encoders. Typically, a dedicated decoding chip is used to implement these functions. This chip provides the excitation signal required for the RTV's operation and simultaneously receives the sine and cosine signals output by the RTV. Internally, the outer contours of the two signals are compared to obtain the absolute position.

[0003] However, in factory operations, operators may not be familiar with permanent magnet synchronous servo motors. When wiring the three phases, there is a possibility of incorrect wiring sequence, which often leads to accidents of varying degrees. Therefore, a detection device and method that can accurately determine whether the operator has correctly connected the three phases of the permanent magnet synchronous servo motor is essential.

[0004] Currently, the correctness of the three-phase wiring sequence of a permanent magnet synchronous servo motor is determined by detecting its rotation direction. The detection methods for rotation direction typically include the following:

[0005] Method 1: Fiber optic / photoelectric detection

[0006] Fiber optic detection identifies the presence or absence of a signal by the intensity of reflection from a color-highlighted block on the object itself or from reflective paper attached to the motor shaft or rotating part. Two optical fibers are used to determine the direction of rotation by the order in which they detect the reflective paper. In contrast, photoelectric detection uses photoelectric switches, and the direction of rotation is determined by the order in which two photoelectric switches detect the signal.

[0007] Fiber optic testing relies entirely on a separate reflective sheet on the product's exterior; if the product doesn't have reflective sheet, it must be attached during testing. Photoelectric switches, due to their short sensing distance, require an external sensing load on the motor shaft during testing, making operation inconvenient. The fiber optic / photoelectric detection method has low data acquisition and feedback efficiency, and the use of stickers is extremely time-consuming.

[0008] Method 2: Servo Motor Testing

[0009] A servo motor is connected to the shaft of the permanent magnet synchronous servo motor under test via a coupling. The rotation of the motor under test drives the rotation of the servo motor. The principle is to identify the direction of rotation of the servo motor through closed-loop feedback. An external high-power DC power supply is used. First, the power supply is current-limited, and then DC power is applied to the motor windings. Phase A is connected to the positive terminal of the DC power supply, and phases B and C are connected to the negative terminal of the DC power supply. After power is applied, the motor rotor is pulled to a fixed position and does not move. This position is the zero position of the rotor.

[0010] Servo motor testing is expensive and is generally used in comprehensive motor testing equipment, which integrates multiple testing instruments to test the motor's withstand voltage, resistance, insulation, and speed, while also testing the torque of the servo motor. Summary of the Invention

[0011] The purpose of this invention is to overcome the shortcomings of the prior art and provide a device for detecting the correctness of the three-phase wiring sequence of a permanent magnet synchronous servo motor, so as to reduce measurement costs, improve detection speed and result accuracy, and facilitate popular testing.

[0012] To achieve the above-mentioned objective, the present invention provides a three-phase wiring sequence correctness detection device for a permanent magnet synchronous servo motor, characterized in that it comprises:

[0013] One drive and control module;

[0014] A resolver decoding module is used to decode the resolver signals, namely sine and cosine signals, output by the resolver on the permanent magnet synchronous servo motor to obtain angular position data and output it to the drive and control module. At the same time, it outputs the excitation signal required for the resolver to work to the resolver, so that it can work and output resolver signals.

[0015] The motor upshift switch and the motor downshift switch are configured such that when the motor upshift switch is pressed and connected, an upshift input is generated and sent to the drive and control module, which then outputs a three-phase upshift control signal to the relay module. When the motor downshift switch is pressed and connected, a downshift input is generated and sent to the drive and control module, which then outputs a three-phase downshift control signal to the relay module.

[0016] The relay module is used to output the corresponding three-phase outputs U, V, W of the motor to the three-phase inputs U, V, W of the permanent magnet synchronous servo motor according to the three-phase control signal for motor upshifting or downshifting;

[0017] The gear position display digital tube is used to display the corresponding gear based on the gear position display data output by the drive and control module;

[0018] LED indicator lights are used to display red or green according to the indicator light signals output by the drive and control module;

[0019] When the three-phase wiring sequence detection device of the permanent magnet synchronous servo motor is powered on, the drive and control module initializes, outputs the gear display data indicating that the gear is 1 to the gear display digital tube, so that it displays that the current gear is 1; outputs the indicator light signal to make the LED indicator light red; reads the angular position data decoded by the decoding module, uses it as the initial angular position data, and saves it as a;

[0020] After initialization, the system waits for an external operator to press either the motor upshift or downshift switch. The motor will then rotate. Each press increments the gear position display data. If the upshift switch is pressed, the gear position display data from the drive and control module increases by 1, and the digital display also increases by 1. When the displayed data equals the number of gears R of the permanent magnet synchronous servo motor, the next press of the upshift switch resets the displayed data to 1, and this cycle repeats. If the downshift switch is pressed, the displayed data decreases by 1, and the digital display also decreases by 1. When the displayed data equals the number of gears 1 of the permanent magnet synchronous servo motor, the next press of the upshift switch resets the displayed data to R, and this cycle repeats. Simultaneously, the system reads and saves the current motor angular position data as 'b', and modifies the previously read angular position data to 'a'.

[0021] The drive and control module compares the values ​​of two angular position data points, a and b, to see if they match the expected rotation direction: when the motor upshift switch is pressed, the permanent magnet synchronous servo motor rotates forward, and the angular position data increases; when the motor downshift switch is pressed, the permanent magnet synchronous servo motor rotates in reverse, and the angular position data decreases. If it matches the expectation, the diode indicator light displays green; otherwise, the diode indicator light displays red.

[0022] Three-phase wiring sequence check:

[0023] (1) Press the motor upshift switch or the motor downshift switch continuously until the indicator light changes from green to red for the first time. At this time, it is considered that the permanent magnet synchronous servo motor is in the relaxed position. Record the gear reading N displayed on the digital tube at this time.

[0024] (2) Next, press the motor upshift switch R times. If the gear position display shows (N+r)%R after the first R-1 times, or press the motor downshift switch R times. If the gear position display shows (Nr)%R after the first R-1 times, and the LED indicator shows green on the 3rd and 4th times, and the gear position display shows N on the Rth time, and the LED indicator shows red, then the three-phase wiring sequence is correct. Otherwise, the three-phase wiring sequence is incorrect, and the wiring sequence should be changed and tested again. Here, r is the sequence number of times the switch is pressed, and % represents the remainder.

[0025] The objective of this invention is achieved as follows.

[0026] This invention relates to a device for detecting the correctness of the three-phase wiring sequence of a permanent magnet synchronous servo motor. It employs a decoding module to drive a rotary transformer and obtains angular position data from the resolver signal output by the rotary transformer. A drive and control module is constructed to drive and control the permanent magnet synchronous servo motor. Based on pressing the energizer button to shift up or down a gear and the corresponding position data, the LED indicator lights are controlled to display red or green. Simultaneously, the gear position is recorded using a gear position display digital tube. The slack position of the permanent magnet synchronous servo motor is located through the LED indicator lights. The device checks whether the color change of the LED indicator lights and the gear position displayed on the gear position digital tube meet the requirements. If they do, the three-phase wiring sequence is correct; otherwise, the wiring sequence is incorrect, and the test should be repeated. This invention only requires recording or observing the color change of the LED indicator lights and whether the gear position displayed on the gear position digital tube meets the requirements to determine the correctness of the three-phase wiring sequence. It has low measurement costs and significantly improves detection speed and accuracy. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the principle of a specific implementation of the three-phase wiring sequence correctness detection device for the permanent magnet synchronous servo motor of the present invention;

[0028] Figure 2 yes Figure 1 The diagram shows the connection between the three-phase wiring sequence detection device and the permanent magnet synchronous servo motor.

[0029] Figure 3 yes Figure 1 The diagram shows the panel of the three-phase wiring sequence correctness detection device. Detailed Implementation

[0030] The specific embodiments of the present invention will now be described with reference to the accompanying drawings to enable those skilled in the art to better understand the invention. It should be particularly noted that in the following description, detailed descriptions of known functions and designs that might obscure the main content of the invention will be omitted here.

[0031] Figure 1 This is a schematic diagram illustrating the principle of a specific implementation of the three-phase wiring sequence correctness detection device for the permanent magnet synchronous servo motor of the present invention.

[0032] In this embodiment, as Figure 1 As shown, the three-phase wiring sequence detection device for permanent magnet synchronous servo motor of the present invention includes a drive and control module 1, a resolver decoding module 2, a motor upshift switch and a motor downshift switch 3, a relay module 4, a gear position display digital tube 5, an LED indicator 6, an excitation signal filtering and amplification module 7, a power supply module 8, and a program interface 9.

[0033] like Figure 2 As shown, the resolver signal output from the resolver on the permanent magnet synchronous servo motor is input to the three-phase wiring sequence correctness detection device of the permanent magnet synchronous servo motor of this invention. Figure 1 As shown, the resolver decoding module 2 decodes the resolver signals output from the resolver on the permanent magnet synchronous servo motor, namely the sine SIN+ / SIN- and cosine COS+ / COS- signals, to obtain angular position data and output it to the drive and control module 1. Simultaneously, it outputs the excitation signal required for the resolver to operate to the resolver, enabling it to operate and output resolver signals. In this embodiment, as... Figure 1 As shown, the excitation signal required for the operation of the resolver decoder module 2 needs to be sent to the excitation signal filtering and amplification module 7 for driving before being output to the resolver.

[0034] In the motor upshift switch and the motor downshift switch 3, when the motor upshift switch is pressed and turned on, a motor upshift input is generated and sent to the drive and control module 1. The drive and control module 1 outputs a three-phase control signal for motor upshift to the relay module 4. When the motor downshift switch is pressed and turned on, a motor downshift input is generated and sent to the drive and control module 1. The drive and control module 1 outputs a three-phase control signal for motor downshift to the relay module 4.

[0035] Relay module 4 outputs corresponding three-phase outputs U, V, and W to the three-phase inputs U, V, and W of the permanent magnet synchronous servo motor based on the motor upshift or downshift three-phase control signal. Figure 2 As shown.

[0036] The gear position display digital tube 5 displays the corresponding gear based on the gear position display data output by the drive and control module 1. The LED indicator 6 displays red or green based on the indicator signal output by the drive and control module 1.

[0037] In this embodiment, an external 18V power supply is connected, and then converted to 5V by the power supply module 8 to power each module. The 18V power supply is directly used to power the relay module 4.

[0038] according to Figure 2 The three-phase wiring sequence detection device for the permanent magnet synchronous servo motor of this invention is connected to the permanent magnet synchronous servo motor in the following manner. After connecting the 18V power supply and the permanent magnet synchronous servo motor, a resistance test is first performed. The resistance values ​​between the two terminals of the sine signal SIN+ / SIN-, the two terminals of the cosine signal COS+ / COS-, the two terminals of the excitation signal EXC / EXC-, and the three-phase output U, V, and W terminals of the motor are measured with a multimeter. At the same time, the tester records the results, as shown in Table 1.

[0039] Resistance test

[0040]

[0041]

[0042] Table 1

[0043] like Figure 3 As shown in this embodiment, the panel of the three-phase wiring sequence correctness detection device for the permanent magnet synchronous servo motor of the present invention has test holes for resistance and insulation testing, which are connected to the two terminals of the sine signal SIN+ / SIN-, the two terminals of the cosine signal COS+ / COS-, the two terminals of the excitation signal EXC / EXC-, and the three-phase output terminals U, V, and W of the motor. The multimeter probes are inserted into the corresponding test holes to perform the corresponding resistance test. In this embodiment, the testing personnel fill in the measurement results in Table 1, compare them with the reference values, and record the pass / fail status in Table 1.

[0044] Then, insulation tests are performed. Insulation meters are used to measure the insulation between the U terminal and the housing (U-CHASS / 500V), the V terminal and the housing (V-CHASS / 500V), the W terminal and the housing (W-CHASS / 500V), the two terminals of the sine signal SIN and the housing (SIN-CHASS / 250V), the two terminals of the cosine signal COS and the housing (COS-CHASS / 250V), and the two terminals of the excitation signal EXC and the housing (EXC-CHASS / 250V). At the same time, the testers record the results, as detailed in Table 2.

[0045] Insulation test

[0046] Terminal / Test Voltage Reference value (ohms) Measured value (ohms) Through the situation SIN-CHASS / 250V >1G COS-CHASS / 250V >1G EXC-CHASS / 250V >1G U-CHASS / 500V >1G V-CHASS / 500V >1G W-CHASS / 500V >1G

[0047] Table 2

[0048] To perform an insulation test, simply insert the probes of the insulation meter into the corresponding test holes. In this embodiment, the tester fills the measurement results into Table 2, compares them with the reference values, and records the pass / fail status in Table 2. It should be noted that if all values ​​in Table 1 are passable, only one of the two terminals for the sine, cosine, and excitation signal in Table 2 needs to be tested. If both Table 1 and Table 2 are satisfactory, the wiring is normal; otherwise, there is poor contact, and the wiring needs to be rewiring.

[0049] After the resistance and insulation tests are passed, the three-phase wiring sequence detection device of the permanent magnet synchronous servo motor is powered on to detect the correctness of the three-phase wiring sequence.

[0050] When the three-phase wiring sequence detection device of the permanent magnet synchronous servo motor is powered on, the drive and control module 1 is initialized, outputting the gear display data indicating that the gear is 1 to the gear display digital tube, so that it displays that the current gear is 1; outputting the indicator light signal to make the LED indicator light red; reading the angular position data decoded by the decoding module, using it as the initial angular position data, and saving it as a;

[0051] After initialization, the system waits for an external operator to press either the motor upshift or downshift switch. The motor will then rotate. Each press increments the gear position display data. If the upshift switch is pressed, the gear position display data from the drive and control module increases by 1, and the digital display also increases by 1. When the displayed data equals the number of gears R of the permanent magnet synchronous servo motor, the next press of the upshift switch resets the displayed data to 1, and this cycle repeats. If the downshift switch is pressed, the displayed data decreases by 1, and the digital display also decreases by 1. When the displayed data equals the number of gears 1 of the permanent magnet synchronous servo motor, the next press of the upshift switch resets the displayed data to R, and this cycle repeats. Simultaneously, the system reads and saves the current motor angular position data as 'b', and modifies the previously read angular position data to 'a'.

[0052] The drive and control module compares the values ​​of two angular position data points, a and b, to see if they match the expected rotation direction: when the motor upshift switch is pressed, the permanent magnet synchronous servo motor rotates forward, and the angular position data increases; when the motor downshift switch is pressed, the permanent magnet synchronous servo motor rotates in reverse, and the angular position data decreases. If it matches the expectation, the diode indicator light displays green; otherwise, the diode indicator light displays red.

[0053] Three-phase wiring sequence check:

[0054] (1) Press the motor upshift switch or the motor downshift switch continuously until the indicator light changes from green to red for the first time. At this time, it is considered that the permanent magnet synchronous servo motor is in the relaxed position. Record the gear reading N displayed on the digital tube at this time.

[0055] (2) Next, press the motor upshift switch R times. If the gear position display shows (N+r)%R after the first R-1 times, or press the motor downshift switch R times. If the gear position display shows (Nr)%R after the first R-1 times, and the LED indicator shows green on the 3rd and 4th times, and the gear position display shows N on the Rth time, and the LED indicator shows red, then the three-phase wiring sequence is correct. Otherwise, the three-phase wiring sequence is incorrect, and the wiring sequence should be changed and tested again. Here, r is the sequence number of times the switch is pressed, and % represents the remainder.

[0056] In this embodiment, R equals 6. Specific rotation tests are shown in Table 3.

[0057] Rotation test

[0058]

[0059] Table 3

[0060] In this embodiment, as shown in Figure 3, first check whether the initial gear is 1 and whether the indicator light is red after power-on, and record and judge. Then, press the motor upshift switch continuously. When the indicator light changes from green to red, record the LED indicator light color and the gear displayed on the digital display tube. This is considered a pass. Then, each time the motor upshift switch is pressed, record the LED indicator light color and the gear displayed on the digital display tube. Judge whether the LED indicator light color is the reference color and whether the gear displayed on the digital display tube is [(Nr)%6]. If so, it is considered a pass. When the 6th press is made, judge whether the LED indicator light color is red and whether the gear displayed on the digital display tube is N. If so, it is considered a pass. If all are passed, the three-phase wiring sequence is correct. Otherwise, the three-phase wiring sequence is incorrect. The wiring sequence should be changed and the test should be repeated.

[0061] Although the illustrative specific embodiments of the present invention have been described above to enable those skilled in the art to understand the invention, it should be understood that the invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of the present invention are protected.

Claims

1. A device for detecting the correctness of the three-phase wiring sequence of a permanent magnet synchronous servo motor, characterized in that, include: One drive and control module; A resolver decoding module is used to decode the resolver signals, namely sine and cosine signals, output by the resolver on the permanent magnet synchronous servo motor to obtain angular position data and output it to the drive and control module. At the same time, it outputs the excitation signal required for the resolver to work to the resolver, so that it can work and output resolver signals. The motor upshift switch and the motor downshift switch are configured such that when the motor upshift switch is pressed and connected, an upshift input is generated and sent to the drive and control module, which then outputs a three-phase upshift control signal to the relay module. When the motor downshift switch is pressed and connected, a downshift input is generated and sent to the drive and control module, which then outputs a three-phase downshift control signal to the relay module. The relay module is used to output the corresponding three-phase outputs U, V, W of the motor to the three-phase inputs U, V, W of the permanent magnet synchronous servo motor according to the three-phase control signal for motor upshifting or downshifting; The gear position display digital tube is used to display the corresponding gear based on the gear position display data output by the drive and control module; LED indicator lights are used to display red or green according to the indicator light signals output by the drive and control module; When the three-phase wiring sequence detection device of the permanent magnet synchronous servo motor is powered on, the drive and control module initializes, outputs the gear display data indicating that the gear is 1 to the gear display digital tube, so that it displays that the current gear is 1; outputs the indicator light signal to make the LED indicator light red; reads the angular position data decoded by the decoding module, uses it as the initial angular position data, and saves it as a; After initialization, wait for an external operator to press the motor upshift or downshift switch to start the motor. The motor will start to rotate. Each time the switch is pressed, if the motor upshift switch is pressed, the gear display data output by the drive and control module will be incremented by 1, and the gear display digital tube will also be incremented by 1. When the gear display data is equal to the number of gears R of the permanent magnet synchronous servo motor, the next time the motor upshift switch is pressed, the gear display data will return to 1, and this cycle will continue. If the motor downshift switch is pressed, the gear position display data output by the drive and control module is decremented by 1, and the gear position display digital tube is also decremented by 1. When the gear position display data is equal to the number of gears of the permanent magnet synchronous servo motor (1), the next time the motor upshift switch is pressed, the displayed gear position data changes to R, and this cycle repeats. At the same time, the current angular position data of the motor is read and saved as b, and the previously read angular position data is modified to a. The drive and control module compares the values ​​of two angular position data points, a and b, to see if they match the expected rotation direction: when the motor upshift switch is pressed, the permanent magnet synchronous servo motor rotates forward, and the angular position data increases; when the motor downshift switch is pressed, the permanent magnet synchronous servo motor rotates in reverse, and the angular position data decreases. If it matches the expectation, the diode indicator light displays green; otherwise, the diode indicator light displays red. Three-phase wiring sequence check: (1) Press the motor upshift switch or the motor downshift switch continuously until the indicator light changes from green to red for the first time. At this time, it is considered that the permanent magnet synchronous servo motor is in the relaxed position. Record the gear reading N displayed on the digital tube at this time. (2) Next, press the motor upshift switch R times. If the gear position display shows (N+r)%R after the first R-1 times, or press the motor downshift switch R times. If the gear position display shows (Nr)%R after the first R-1 times, and the LED indicator shows green on the 3rd and 4th times, and the gear position display shows N on the Rth time, and the LED indicator shows red, then the three-phase wiring sequence is correct. Otherwise, the three-phase wiring sequence is incorrect, and the wiring sequence should be changed and tested again. Here, r is the sequence number of times the switch is pressed, and % represents the remainder.

2. The three-phase wiring sequence detection device for a permanent magnet synchronous servo motor according to claim 1, characterized in that, Its panel has test holes for resistance testing and insulation testing, which are connected to the two terminals of the sine signal, the two terminals of the cosine signal, the two terminals of the excitation signal, and the U, V, W terminals of the three-phase output of the motor. The multimeter probes are inserted into the corresponding test holes to perform the corresponding resistance test. The tester fills in the measurement results in the table, compares them with the reference value, and records the pass or fail status. To perform an insulation test, simply insert the probes of the insulation meter into the corresponding test hole. The tester will then fill in the measurement results in the table, compare them with the reference values, and record the pass / fail status: pass or fail. If both pass / fail, the wiring is normal; otherwise, the wiring has poor contact and needs to be rewired. After the resistance and insulation tests are passed, the three-phase wiring sequence detection device of the permanent magnet synchronous servo motor is powered on to detect the correctness of the three-phase wiring sequence.

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