CN114859149A - Test system for electrical parameters of rotary encoder - Google Patents
Test system for electrical parameters of rotary encoder Download PDFInfo
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- CN114859149A CN114859149A CN202210341519.0A CN202210341519A CN114859149A CN 114859149 A CN114859149 A CN 114859149A CN 202210341519 A CN202210341519 A CN 202210341519A CN 114859149 A CN114859149 A CN 114859149A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
- G01D18/001—Calibrating encoders
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Abstract
The application discloses rotary encoder electrical parameter's test system relates to the industrial automation control field, can solve the problem of unable real-time test rotary encoder electrical parameter. The device mainly includes: a programmable control device; a motor driver connected with the programmable control device; a rotary encoder connected to the motor driver; the universal programmable analog-to-digital conversion device is connected with the rotary encoder and is used for outputting a rotary digital signal corresponding to the rotary encoder; the general programmable analog-to-digital conversion device is connected with the programmable control device, and the programmable control device acquires the electrical parameters of the rotary encoder according to the rotary digital signals. The programmable control device controls the rotary encoder and tests the electrical parameter of the rotary encoder, so that the product index of the rotary encoder can be quantitatively measured, reliable basis is provided for quality control of the rotary encoder, and the electrical parameter of the rotary encoder can be monitored in real time.
Description
Technical Field
The application relates to the field of industrial automation control, in particular to a test system for electrical parameters of a rotary encoder.
Background
A rotary encoder is a device that detects the direction and rotation angle (or number of pulses) of the encoder rotation by digitally encoding the phase difference between a-phase and B-phase signals, and is widely used in modern electronic devices. However, the rotary encoder is relatively original in the production line test of manufacturers, typically, the rotary encoder is manually rotated, and the detection is performed in a mode of observing output waveforms by an oscilloscope and the like. The mode only tests the basic functions of the encoder and has no good effect on quality control of batch production.
In the related art, a general data acquisition card may be used to transmit the acquired waveform data to a computer, and the computer software analyzes and tests the electrical parameters of the rotary encoder. The test method can be used for testing the electrical parameters of most rotary encoders, and cannot be used for real-time analysis test, so that the test delay is large.
Disclosure of Invention
The application provides a test system of rotary encoder electrical parameter to solve the problem that can't test rotary encoder electrical parameter in real time.
The application provides a rotary encoder electrical parameter's test system, includes: the programmable control device is used for outputting a motor control signal; a motor driver connected to the programmable control device, the motor driver being rotatable in response to a motor control signal; the rotary encoder is connected with the motor driver and is linked with the motor driver; the universal programmable analog-to-digital conversion device is connected with the rotary encoder and is used for acquiring a rotary analog signal output by the rotary encoder and converting a voltage analog signal into a rotary digital signal; the general programmable analog-to-digital conversion device is connected with the programmable control device, the programmable control device is also used for receiving the rotating digital signal and acquiring the electrical parameters of the rotary encoder according to the rotating digital signal, and the electrical parameters comprise: signal direction, number of pulses per turn, phase difference, slip noise and kick noise; the power supply of the programmable control device, the motor driver and the universal programmable analog-digital conversion device is a direct current power supply for outputting a preset voltage value.
Further, the general programmable analog-to-digital conversion device is connected with the touch screen, so that the touch screen can display the electrical parameters conveniently.
Further, the programmable control device is connected with the touch screen, so that the programmable control device is controlled to operate through the touch screen.
Further, the general programmable analog-to-digital conversion device converts the rotation analog signal into a waveform data signal according to a preset sampling frequency under the condition that the rotation analog signal output by the rotation encoder is detected, and acquires the rising edge jitter time width, the falling edge jitter time width, the high-level stuffing noise time width and the low-level pulse noise time width of the waveform data signal.
Further, the touch screen displays electrical parameters, including: the programmable control device detects the rising edge jitter time width, the falling edge jitter time width, the high level lower limit pulse width and the waveform period in which the maximum value of the low level peak pulse width is positioned in the rotating digital signal and records the waveform period as a target waveform period; or, under the condition that the phase difference of the waveform in the rotating digital signal does not belong to the preset phase difference range, the programmable control device records the waveform period with the maximum phase difference as the target waveform period; the programmable control device sends the target waveform period to the touch screen; the touch screen displays the target waveform period and the electrical parameters corresponding to the target waveform period.
Further, the number of the rotary encoders is adapted to the number of ports of the input terminal of the general programmable analog-to-digital conversion device.
Furthermore, the general programmable analog-digital conversion device is connected with the programmable control device through a preset RS232 communication interface.
The application provides a pair of rotary encoder electrical parameter's test system, through programmable control device control rotary encoder and test rotary encoder's electrical parameter test, can quantify measure rotary encoder's product index, for rotary encoder's quality control provides reliable foundation to can real-time supervision rotary encoder electrical parameter.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a schematic diagram illustrating an exemplary embodiment of a system for testing electrical parameters of a rotary encoder;
FIG. 2 is a schematic representation of a rotary encoder according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of measuring phase difference and selecting direction of two-phase waveform data according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a touch screen displaying an electrical parameter according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram illustrating a touch screen setting test parameter provided in an embodiment of the present application;
description of the drawings: 11-programmable control device, 12-universal programmable analog-to-digital conversion device, 13-motor driver, 14-rotary encoder, 15-power supply and 16-touch screen.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. In the specification and claims of this application, "and/or" means at least one of the connected objects, the character "/" generally means that the former and latter related objects are in an "or" relationship.
In the related art, in order to test the electrical parameters of the rotary encoder, a measuring plate which is customized and developed for a specific type of encoder is adopted, and partial main parameters in the electrical parameters of the rotary encoder can be tested according to the characteristics of the encoder, but the measuring plate is high in development cost and difficult to apply in batches. The measuring board has limited usage amount and short project development period, and more instability and unreliability can be hidden in the measuring process. Meanwhile, the problem that the electrical parameters of the rotary encoder cannot be tested in real time exists.
In order to solve the above technical problem, referring to fig. 1, a schematic composition diagram of a system for testing electrical parameters of a rotary encoder according to an embodiment of the present application is provided, where the system includes:
the programmable control device is used for outputting a motor control signal; a motor driver connected to the programmable control device, the motor driver being rotatable in response to a motor control signal; the rotary encoder is connected with the motor driver and is linked with the motor driver; the universal programmable analog-to-digital conversion device is connected with the rotary encoder and is used for acquiring a rotary analog signal output by the rotary encoder and converting a voltage analog signal into a rotary digital signal; the general programmable analog-to-digital conversion device is connected with the programmable control device, the programmable control device is also used for receiving the rotating digital signal and acquiring the electrical parameters of the rotary encoder according to the rotating digital signal, and the electrical parameters comprise: signal direction, number of pulses per turn, phase difference, slip noise and kick noise; the power supply of the programmable control device, the motor driver and the universal programmable analog-digital conversion device is a direct current power supply for outputting a preset voltage value.
The rotary encoder is a device for measuring the rotating speed and realizing the rapid speed regulation by matching with a digital encoding technology for analog signal level, and is widely applied to the field of automatic control. As shown in fig. 2, a schematic physical diagram of a rotary encoder according to an embodiment of the present application is provided.
For example, the programmable control devices may include 16 isolated inputs/16 NPN outputs, and each programmable control device may control 4 motor drivers, respectively controlling 4 motor drivers to rotate in forward or reverse directions. The universal programmable analog-to-digital conversion device can comprise 6 analog-to-digital conversion inputs and 8 isolation inputs, each universal programmable analog-to-digital conversion device can receive 4 voltage signal inputs, and two rotary encoder electrical parameters can be tested.
It should be noted that when the number of the rotary encoders to be tested is greater than 2, a general-purpose programmable analog-to-digital conversion device can be added to the test system. The universal programmable analog-digital conversion devices can be connected through a preset communication interface and can transmit data information.
In the embodiment of the present application, the preset voltage value may be 24V. The single 24V rated voltage is used for supplying power in the test system, so that the energy consumption of the test system can be saved.
In the embodiment of the present application, as shown in fig. 3, a schematic diagram for measuring a phase difference and selecting a direction for two-phase waveform data is provided in the embodiment of the present application. The rotation direction is determined to be forward when the rising edge of the a phase leads the rising edge of the B phase, and reverse when not, and the ratio (Δ T/T, i.e., phase difference) of the time difference between the rising edge of the a phase and the rising edge of the B phase to the pulse waveform period can be measured.
In the embodiment of the application, the detection of the rotary encoder is realized according to the register in the general programmable analog-digital conversion device. Illustratively, as shown in Table 1, assume that the register is defined bitwise as:
TABLE 1
When the register data is set to the AD channel number of 0x 0001-0 x0006, the registers D3100-D3619 are read-only data and present high-level or low-level segment signal level data corresponding to the AD channel original data. Each channel can detect 256 level waveform data at the maximum. The level data as shown in table 2 is defined as follows:
TABLE 2
When the register data is set to 0x01xx, the registers D3100-D3889 are read-only data and present square/pulse wave period detection data for the corresponding analog-to-digital conversion AD channels. Each channel can detect 64 square/pulse wave periodic waveform data at the maximum.
Registers D3100-D3489 define the analog-to-digital conversion channel A cycle waveform data for bit3-0 of D3040. Registers D3500-D3889 are the periodic waveform data for AD channel B defined by bit7-4 of D3040. As shown in table 3, the waveform data per channel cycle is defined as follows:
TABLE 3
When the data in the register D3040 is set to 0x02xx, the registers D3100-D3889 are read-only data and present the integrated detection data corresponding to all the periodic signals of the AD channel square/pulse waves. The registers D3100-D3124 are the comprehensive detection data of all periodic signals of the AD channel A square wave/pulse wave defined by bit3-0 of D3040. Registers D3200-D3224 are comprehensive detection data of signals of all periods of AD channel B square waves/pulse waves defined by bit7-4 of D3040. Registers D3300-D3305 are the data of the crossing detection result of AD channel A and channel B defined by D3040. At this time, D3041 defines the data duration (mS, default is 1000mS) of the integrated detection and cross detection of all periodic signals of the square wave/pulse wave. The comprehensive detection data of all periodic signals of the corresponding AD channel a and channel B square wave/pulse wave presented by the registers D3100-D3124 and the registers D3200-D3224 are defined as follows, as shown in table 4:
TABLE 4
Registers D3300-D3305 are the data of the intersection detection result of AD channel A and channel B defined by D3040, as shown in Table 5, as follows:
TABLE 5
Due to the definition of the register, the programmable control device can obtain the electrical parameters of the rotary encoder. In the embodiment of the application, the programmable control device and the general programmable analog-to-digital conversion device can be produced in batch, and the production cost is low, so that the implementation cost of the whole test system is also low. Moreover, due to the programmable control device and the universal programmable analog-digital conversion device, a test system with high reliability and high stability can be developed, and the success rate of project application is further improved. In addition, because the programmable control device and the general programmable analog-to-digital conversion device have high-speed data processing capacity and programmability, the labor cost generated by project programming, project design, project implementation and debugging is low, and the project cycle is favorably shortened and the success rate of projects is favorably improved.
The application provides a pair of rotary encoder electrical parameter's test system, through programmable control device control rotary encoder and test rotary encoder's electrical parameter test, can quantify measure rotary encoder's product index, for rotary encoder's quality control provides reliable foundation to can real-time supervision rotary encoder electrical parameter.
Further, the general programmable analog-to-digital conversion device is connected with the touch screen, so that the touch screen can display the electrical parameters conveniently.
Further, the programmable control device is connected with the touch screen, so that the programmable control device is controlled to operate through the touch screen.
Since data interaction can be performed between the programmable control device, the general programmable analog-to-digital conversion device and the touch screen through the communication interface, as shown in fig. 4 and 5, both of the above two modes can realize displaying result values on the touch screen, which are the signal directions of output waveform detection when the encoder is rotated in the forward direction and the reverse direction, the resolution capability (the number of pulses per turn), the maximum value and the minimum value of the phase difference of the a/B phase, the sliding noise of the rising edge and the falling edge (t1, t3), the kick noise, and the total measurement result value. Also, as shown in fig. 5, test parameters of the rotary encoder may be set through the touch screen.
The touch screen is used for displaying the measuring result, measuring the waveform and a man-machine interface. The touch screen is directly connected with the analog-to-digital conversion module, so that the quick data refreshing of the measurement data between the touch screen and the touch screen is facilitated.
Because the display area of the touch screen is limited, if the whole waveform is displayed completely, only dense and hemp lines can be seen, and human eyes cannot identify the waveform quality, so that the display significance is not provided. If a scrolling display is used, the human eye does not see the problematic waveform as it is waved. For this reason we only show the worst periodic waveform plot of the worst data results for each encoder detection on the touch screen. To identify the worst-cycle waveform, we take the following rule:
in the time period for detecting the A-phase waveform and the B-phase waveform of the encoder, the waveform period in which the maximum value of the rising edge jitter time width, the falling edge jitter time width, the high-level lower limit pulse width and the low-level peak pulse width of each periodic waveform is located is searched and recorded as the worst periodic waveform period, and the starting time point of the period is recorded.
If the maximum value/minimum value of the A/B phase difference exceeds the upper and lower limits of the set allowable phase difference, the waveform period exceeding the farthest value of the set threshold is preferentially selected and recorded as the worst waveform period, and the starting time point of the period is recorded.
Further, the general programmable analog-to-digital conversion device converts the rotation analog signal into a waveform data signal according to a preset sampling frequency under the condition that the rotation analog signal output by the rotation encoder is detected, and acquires the rising edge jitter time width, the falling edge jitter time width, the high-level stuffing noise time width and the low-level pulse noise time width of the waveform data signal.
Further, the touch screen displays electrical parameters, including: the programmable control device detects the rising edge jitter time width, the falling edge jitter time width, the high level lower limit pulse width and the waveform period where the maximum value of the low level peak pulse width is positioned in the waveform in the rotating digital signal and records the waveform period as a target waveform period; or, under the condition that the phase difference of the waveform in the rotating digital signal does not belong to the preset phase difference range, the programmable control device records the waveform period with the maximum phase difference as the target waveform period; the programmable control device sends the target waveform period to the touch screen; the touch screen displays the target waveform period and the electrical parameters corresponding to the target waveform period.
For example, the PLC program of the generic programmable analog-to-digital conversion device directly connected to the touch screen can display 2 encoder measurement results connected to the generic programmable analog-to-digital conversion device and output a waveform diagram of the worst cycle on the touch screen according to the read-back data. The universal programmable analog-digital conversion device which is not directly connected with the touch screen can not be directly output to the touch screen, and the automatic data exchange function between the devices is needed to transmit data, and finally 2 encoder measurement results connected with the universal programmable analog-digital conversion device and a waveform chart of the worst output period are displayed on the touch screen.
Further, the number of the rotary encoders is adapted to the number of ports of the input terminal of the general programmable analog-to-digital conversion device. If the rotary encoder to be tested has more data, a plurality of universal programmable analog-to-digital conversion devices can be arranged in the test system, and the universal programmable analog-to-digital conversion devices are cascaded.
Furthermore, the general programmable analog-digital conversion device is connected with the programmable control device through a preset RS232 communication interface.
It should be further noted that, for the programmable control device, the method specifically includes: a main controller; the first communication module is connected with the main controller and is used for being connected with a PLC interface of a previous-stage programmable controller; the second communication module is connected with the main controller and is used for being connected with a next-stage PLC interface; a signal input circuit connected with the main controller; and the signal output circuit is connected with the main controller.
The programmable control device provided by the application comprises the main controller, the signal input circuit and the signal output circuit, so that the programmable control device can be used as a host computer and an expansion module, and has high compatibility. On the basis, the types and types of the programmable control device can be reduced, so that the same hardware circuit can realize various unit functions, and the cost for producing the programmable control device is further reduced.
Alternatively, the main controller of the programmable control device may be a processor using ARM Cortex (possibly using different models of processors based on functionality). The processor realizes input signal detection, output control, communication with upper and lower PLC interfaces and automatic data exchange, and realizes bottom code support and execution environment of programmable function.
Optionally, the programmable control device is designed to implement a function control unit, and in order to implement automatic data exchange with the upper module and the lower module, the first communication module may include at least one first communication interface, and may be connected to other function control units, the industrial personal computer, the touch screen, and the terminal through the first communication interface; the second communication module can include at least one second communication interface, can be connected with other function control units, industrial computer, touch screen and terminal through second communication interface. It should be noted that the first communication interface and the second communication interface may be RS232 and RS485 in the industry standard, or other communication modes (such as network communication, wireless communication, etc.).
It should be noted that, in the embodiment of the present application, the general programmable analog-to-digital conversion apparatus specifically includes:
a main controller; the first communication module is connected with the main controller and is used for being connected with a PLC interface of a previous-stage programmable controller; the second communication module is connected with the main controller and is used for being connected with a next-stage PLC interface; the analog signal input circuit comprises a current signal measuring sub-circuit and a voltage signal measuring sub-circuit; and the analog signal output circuit comprises a current signal output sub-circuit and a voltage signal output sub-circuit.
In the programmable analog-digital conversion device provided by the application, the programmable analog-digital conversion device comprises the main controller and also comprises the analog signal input circuit, the digital signal input circuit, the analog signal output circuit and the digital signal output circuit, so that the programmable analog-digital conversion device can be used as a host computer and an expansion module, and has high compatibility. On the basis, the types and types of the programmable control device can be reduced, so that the same hardware circuit can realize various unit functions, and the cost for producing the programmable control device is further reduced.
Alternatively, the main controller of the programmable control device may be a processor using ARM Cortex (possibly using different models of processors based on functionality). The processor realizes input signal detection, output control, communication with upper and lower PLC interfaces and automatic data exchange, and realizes bottom code support and execution environment of programmable function.
In the embodiment of the application, each universal programmable analog-to-digital conversion device measures 4 paths of voltage signals, and each 2 paths of voltage signals measure the phase A and phase B signals of 1 rotary encoder; each programmable analog-to-digital conversion device can measure 2 encoder electrical parameters. The 4 encoders are measured by using 2 programmable analog-to-digital conversion devices, and communication ports of the encoders are connected in series.
Furthermore, the upper-stage PLC, the lower-stage PLC and the general programmable analog-to-digital conversion device are connected by a target topological architecture, so that data exchange and data sharing are conveniently carried out among all nodes in the topological architecture, and the target topological architecture is a linear or tree-shaped topological architecture.
It should be noted that the nodes in the topology structure include a programmable control device, a general programmable analog-to-digital conversion device, a touch screen, an industrial personal computer, a sensor, and the like. Therefore, all nodes are connected by a linear or tree topology structure and are integrated, and automatic data exchange and data sharing among the nodes are realized. All the nodes are integrated, a large amount of hardware is saved for automatic control of equipment, cost is reduced, and efficiency is improved.
The same and similar parts in the various embodiments in this specification may be referred to each other. The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Claims (7)
1. A system for testing electrical parameters of a rotary encoder, comprising:
a programmable control device for outputting a motor control signal;
a motor driver connected to the programmable control device, the motor driver rotating in response to the motor control signal;
the rotary encoder is connected with the motor driver and is linked with the motor driver;
the universal programmable analog-to-digital conversion device is connected with the rotary encoder and used for acquiring a rotary analog signal output by the rotary encoder and converting the voltage analog signal into a rotary digital signal;
the general programmable analog-to-digital conversion device is connected with the programmable control device, the programmable control device is further used for receiving the rotation digital signal and obtaining the electrical parameters of the rotary encoder according to the rotation digital signal, and the electrical parameters include: signal direction, number of pulses per turn, phase difference, slip noise and kick noise;
the power supply of the programmable control device, the motor driver and the universal programmable analog-to-digital conversion device is a direct current power supply which outputs a preset voltage value.
2. The rotary encoder electrical parameter testing system of claim 1, wherein the generic programmable analog-to-digital conversion device is coupled to a touch screen to facilitate display of the electrical parameter by the touch screen.
3. The rotary encoder electrical parameter testing system of claim 1, wherein the programmable control device is coupled to a touch screen to facilitate control of the programmable control device by the touch screen.
4. The system for testing electrical parameters of a rotary encoder according to claim 2 or 3, wherein the generic programmable analog-to-digital converter converts the rotary analog signal into a waveform data signal according to a preset sampling frequency under the condition that the rotary analog signal outputted from the rotary encoder is detected, and obtains a rising edge jitter time width, a falling edge jitter time width, a high-level stuffing noise time width and a low-level pulse noise time width of the waveform data signal.
5. The system for testing electrical parameters of a rotary encoder according to claim 4, wherein the programmable control device detects the waveform period in which the maximum value of the rising edge jitter time width, the falling edge jitter time width, the high level lower limit pulse width and the low level peak pulse width of the waveform in the rotary digital signal is recorded as the target waveform period; or the like, or, alternatively,
under the condition that the phase difference of the waveforms in the rotating digital signal does not belong to a preset phase difference range, the programmable control device records the waveform period with the maximum phase difference as the target waveform period;
the programmable control device sends the target waveform period to the touch screen;
and the touch screen displays the target waveform period and the electrical parameters corresponding to the target waveform period.
6. The system for testing electrical parameters of a rotary encoder according to claim 1, wherein the number of rotary encoders is adapted to the number of ports of the input of the generic programmable analog-to-digital conversion device.
7. The rotary encoder electrical parameter testing system of claim 1, wherein the generic programmable analog-to-digital conversion device is connected to the programmable control device via a pre-set RS232 communication interface.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116892970A (en) * | 2023-09-11 | 2023-10-17 | 泉州昆泰芯微电子科技有限公司 | Method for judging stability of magnetic encoder based on timestamp register and motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116892970A (en) * | 2023-09-11 | 2023-10-17 | 泉州昆泰芯微电子科技有限公司 | Method for judging stability of magnetic encoder based on timestamp register and motor |
| CN116892970B (en) * | 2023-09-11 | 2023-11-14 | 泉州昆泰芯微电子科技有限公司 | Method for judging stability of magnetic encoder based on timestamp register and motor |
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