CN211627764U - Device for identifying mechanical load of induction motor - Google Patents
Device for identifying mechanical load of induction motor Download PDFInfo
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- CN211627764U CN211627764U CN201922314099.3U CN201922314099U CN211627764U CN 211627764 U CN211627764 U CN 211627764U CN 201922314099 U CN201922314099 U CN 201922314099U CN 211627764 U CN211627764 U CN 211627764U
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Abstract
The utility model discloses a device for identifying mechanical load of an induction motor, which comprises a three-phase sampling circuit, a microprocessor, a communication circuit, a storage circuit and a power circuit; the power circuit is respectively connected with the three-phase sampling circuit and the microprocessor; the three-phase sampling circuit is connected with the microprocessor; the microprocessor is respectively connected with the communication circuit and the storage circuit in a bidirectional way; the three-phase sampling circuit is used for sampling and AD converting three-phase voltage and three-phase current instantaneous values of the induction motor in the primary circuit; the storage circuit is used for storing voltage and current discrete waveform data and mechanical load parameters of the induction motor; the three-phase sampling circuit samples the discrete waveform data of the three-phase voltage and the three-phase current of the induction motor and inputs the sampled data into the microprocessor; and the microprocessor processes the acquired discrete waveform data and monitors the mechanical load. The utility model discloses with low costs, the security is good, and the practicality is strong.
Description
Technical Field
The utility model relates to a motor detects technical field, in particular to a device for induction machine mechanical load discerns.
Background
In practical industrial situations, there are a large number of mechanical devices such as centrifugal fans, centrifugal pumps, axial fans, etc. which use induction motors as power sources. These devices are often associated with safety in industrial production, for example, centrifugal fans in paint shops are used to control the harmful gas content of the shops to protect workers, for example, centrifugal pumps in cooling systems need to be replenished with cooling media in time to maintain the system at a constant temperature. Once sudden failure occurs in the equipment, temporary shutdown is needed if the equipment is light, and safety accidents occur if the equipment is heavy. The prior art needs to install a large number of sensors, such as a mechanical vibration sensor, a temperature sensor and the like, so as to realize fault diagnosis of mechanical loads. Therefore, it is desirable to provide a device for identifying mechanical load of an induction motor, which can capture the change of the mechanical load parameter of the induction motor in advance, and send out early warning of load fault in time to reduce the probability of occurrence of sudden fault.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming prior art's not enough, providing a device for induction machine mechanical load discerns with low costs and the security is good, in time diagnose load trouble and send load trouble early warning, reduce the probability that proruption trouble takes place.
In order to realize the purpose of the utility model, the utility model discloses a technical scheme realize as follows: a device for identifying mechanical load of an induction motor comprises a three-phase sampling circuit, a microprocessor, a communication circuit, a storage circuit and a power circuit; the power circuit is respectively connected with the three-phase sampling circuit and the microprocessor; the three-phase sampling circuit is connected with the microprocessor; the microprocessor is respectively connected with the communication circuit and the storage circuit in a bidirectional way; wherein the content of the first and second substances,
the three-phase sampling circuit is used for sampling and AD converting the three-phase voltage and three-phase current instantaneous values of the induction motor in the primary loop;
the storage circuit is used for storing voltage and current discrete waveform data and mechanical load parameters of the induction motor;
the three-phase sampling circuit samples the discrete waveform data of the three-phase voltage and the three-phase current of the induction motor and inputs the sampled discrete waveform data into the microprocessor;
the microprocessor acquires discrete waveform data of voltage and current of the induction motor in a starting process and a stable operation process within a period of time through the three-phase sampling circuit, and stores the discrete waveform data in the storage circuit;
and the microprocessor processes the acquired discrete waveform data, fits mechanical load parameters of the induction motor, identifies the type of the mechanical load according to the mechanical load parameters, and finally compares the currently identified mechanical load parameters with the previously identified mechanical load parameters for multiple times to judge whether the mechanical load has abnormity or faults.
Preferably, if the difference between the currently identified mechanical load parameter and the previously identified mechanical load parameter is greater than a set threshold, the mechanical load is considered to have an abnormality or a fault; and if the difference value between the currently identified mechanical load parameter and the previously identified mechanical load parameter is smaller than the set threshold value, the mechanical load is considered to have no abnormality or fault.
Preferably, the communication circuit comprises an ethernet communication circuit and an RS485 communication circuit, and the ethernet communication circuit and the RS485 communication circuit are bidirectionally connected with the microprocessor; the Ethernet communication circuit is used for communication between the microprocessor and the upper computer.
Preferably, the alarm further comprises an audible and visual alarm, and the audible and visual alarm is connected with the RS485 communication circuit; when the mechanical load is abnormal or has faults, the microprocessor outputs an alarm signal to the audible and visual alarm through the RS485 communication circuit, and the audible and visual alarm carries out local audible and visual alarm according to the alarm signal.
Preferably, the microprocessor is an AM3358 embedded microprocessor.
Preferably, the system further comprises a clock circuit, wherein the clock circuit is bidirectionally connected with the microprocessor and used for providing a clock pulse signal for the microprocessor.
Preferably, the power supply circuit is used for supplying power to the three-phase sampling circuit, the microprocessor, the communication circuit, the storage circuit and the clock circuit.
Preferably, the types of mechanical loads are classified into constant power loads, constant torque loads, and quadratic loads.
Preferably, the mechanical load parameters include rotational speed, slip and power.
Advantageous effects
Compared with the prior art, the utility model discloses the beneficial effect who gains does: the utility model discloses a microprocessor acquires induction motor's voltage and the discrete waveform data of electric current through three-phase sampling circuit, utilizes embedded nonlinear fitting algorithm, and the mechanical load parameter of induction motor is gone out in the fitting, realizes the detection to induction motor's mechanical load, and it is unusual or the trouble whether to differentiate mechanical load, in time discovers mechanical load unusual or trouble to send the early warning, reduce the emergence of mechanical load sudden failure, improve the utility model discloses a security. Simultaneously, compare with traditional mechanical load's failure diagnosis, the utility model discloses with the mode of minimum invasion, reduce the quantity of sensor, reduced the cost and the cost of installation, the practicality is strong.
Drawings
FIG. 1 is a schematic diagram of the present invention;
fig. 2 is a circuit diagram of a first circuit of the microprocessor of the present invention;
fig. 3 is a circuit diagram of a second circuit of the microprocessor of the present invention;
fig. 4 is a circuit diagram of a third circuit of the microprocessor of the present invention;
fig. 5 is a circuit diagram of a three-phase sampling circuit of the present invention;
fig. 6 is a circuit diagram of a power supply circuit of the present invention;
fig. 7 is a circuit diagram of a clock circuit according to the present invention;
fig. 8 is a circuit diagram of an RS485 communication circuit of the present invention;
fig. 9 is a circuit diagram of the ethernet communication circuit of the present invention.
Fig. 10 is a circuit diagram of a memory circuit according to the present invention.
The technical characteristics corresponding to the marks in the attached drawings are as follows: the system comprises a power supply circuit 1, a three-phase sampling circuit 2, a microprocessor 3, an Ethernet communication circuit 4, an RS485 communication circuit 5, a storage circuit 6 and a clock circuit 7.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1 to 10, an apparatus for identifying a mechanical load of an induction motor includes a three-phase sampling circuit 2, a microprocessor 3, a communication circuit, a storage circuit 6 and a power circuit 7; the power circuit 7 is respectively connected with the three-phase sampling circuit 2 and the microprocessor 3; the three-phase sampling circuit 2 is connected with the microprocessor 3; the microprocessor 3 is respectively connected with the communication circuit and the storage circuit 6 in two directions; wherein the content of the first and second substances,
as shown in fig. 5, the three-phase sampling circuit 2 is configured to sample and AD-convert instantaneous values of three-phase voltages and three-phase currents of the induction motor in the primary circuit; the three-phase sampling circuit 2 comprises an A-phase voltage sampling circuit, a B-phase voltage sampling circuit, a C-phase voltage sampling circuit, an A-phase current sampling circuit, a B-phase current sampling circuit and a C-phase current sampling circuit; the A phase voltage sampling circuit is used for collecting A phase voltage; the B phase voltage sampling circuit is used for collecting B phase voltage; the C phase voltage sampling circuit is used for collecting C phase voltage; the A-phase current sampling circuit is used for collecting A-phase current; the B-phase current sampling circuit is used for collecting B-phase current; the C-phase current sampling circuit is used for collecting A-phase current;
the communication circuit comprises an Ethernet communication circuit 4 and an RS485 communication circuit 5, and the Ethernet communication circuit 4 and the RS485 communication circuit 5 are in bidirectional connection with the microprocessor 3; the Ethernet communication circuit 4 is used for communication between the microprocessor 3 and an upper computer (not shown in the drawing); the Ethernet communication circuit 4 adopts a LAN8710A chip, and the LAN8710A chip has small volume and low power consumption; the RS485 communication circuit 5 adopts an ADM2587EBRWZ chip. The ADM2587EBRWZ chip has an overheating shutoff characteristic, can prevent output short circuit, and can prevent the chip from being damaged due to excessive loss of a power supply when the temperature is too high.
The alarm also comprises an audible and visual alarm (not shown in the attached drawing), and the audible and visual alarm is connected with the RS485 communication circuit; when the mechanical load is abnormal or has faults, the microprocessor 3 outputs an alarm signal to the audible and visual alarm through the RS485 communication circuit, and the audible and visual alarm carries out local audible and visual alarm according to the alarm signal.
The clock circuit 7 is connected with the microprocessor 3 in a bidirectional mode and used for providing clock pulse signals for the microprocessor 3. The clock circuit 7 adopts an RX8025T-UB chip. RX8025T-UB chip is a section possesses I2C interface and temperature compensation function' S novel real-time clock chip, the internal integration 32.768KHz temperature compensation crystal oscillator, can be used to the occasion of various needs high accuracy clocks, through setting up the control bit of corresponding compensation, can realize the temperature compensation function of different intervals, thereby the precision of clock has been improved greatly, the chip can set up four different periods and carry out temperature compensation, the default setting is 2S compensation, this chip adopts C-MOS technology production, have extremely low functional consumption, can use the battery power supply for a long time.
The power supply circuit 1 is used for supplying power to the three-phase sampling circuit 2, the microprocessor 3, the communication circuit, the storage circuit 6 and the clock circuit 7. The power circuit 1 adopts a TPS65217C chip.
The storage circuit 6 is used for storing voltage and current discrete waveform data and mechanical load parameters of the induction motor; the DDR3 chip is adopted in the storage circuit 6, the DDR3 chip reduces energy consumption and heat productivity on the basis of controlling cost, due to the fact that energy consumption is reduced, the DDR3 can achieve higher working frequency, the defect that delay time is long is made up to a certain degree, and universality is good. The utility model discloses a storage circuit 6 adopts the DDR3 chip can practice thrift the cost.
The three-phase sampling circuit 2 adopts an ADE7878 chip and an SPX3819M5-L chip. The ADE7878 chip is a high-precision three-phase electric energy measurement IC chip, adopts a serial interface and provides three paths of flexible pulse outputs. The ADE7878 chip houses a second order sigma-delta ADC (analog-to-digital converter), a digital integrator, a reference voltage source circuit, and all necessary signal processing circuitry, and can perform total (fundamental and harmonic) active, reactive, and apparent power measurements, fundamental active and reactive power measurements, and effective value calculations. The SPX3819M5-L chip has low dropout, low noise output, reverse battery protection, current limiting, and thermal shutdown.
The mechanical load parameters include rotational speed, slip and power.
The types of mechanical loads are classified into constant power loads, constant torque loads, and quadratic loads. A quadratic load means that the torque of the mechanical load is proportional to the square of the rotational speed.
The microprocessor adopts an AM335X series chip, the microprocessor 3 is an AM3358 embedded microprocessor which is embedded with a nonlinear fitting algorithm, and the AM3358 processor has the characteristics of high processing performance, low power consumption and high integration of peripheral equipment, and can provide leading image processing performance and support a real-time protocol.
The microprocessor 3 acquires discrete waveform data of voltage and current of the induction motor in the starting process and the stable operation process in a period of time through the three-phase sampling circuit 2 and stores the discrete waveform data in the storage circuit 6;
as shown in fig. 2-4, the microprocessor includes a first circuit, a second circuit, and an electrical tri-circuit.
The working principle of the present invention is described in detail below:
the three-phase sampling circuit 2 samples the discrete waveform data of the three-phase voltage and the three-phase current of the induction motor and inputs the sampled data into the microprocessor 3; the microprocessor 3 processes the obtained discrete waveform data by using an embedded nonlinear fitting algorithm, fits mechanical load parameters of the induction motor, identifies the type of the mechanical load according to the mechanical load parameters, and compares the currently identified mechanical load parameters with the previously identified mechanical load parameters for multiple times to judge whether the mechanical load is abnormal or failed; and if the difference value between the currently identified mechanical load parameter and the previously identified mechanical load parameter is smaller than the set threshold value, the mechanical load is considered to have no abnormality or fault. If the difference value between the currently identified mechanical load parameter and the previously identified mechanical load parameter is larger than a set threshold value, the mechanical load is considered to have abnormality or failure; the microprocessor 3 outputs an alarm signal to the audible and visual alarm through the RS485 communication circuit, and the audible and visual alarm carries out local audible and visual alarm according to the alarm signal.
The utility model discloses a microprocessor 3 acquires induction motor's voltage and the discrete waveform data of electric current through three-phase sampling circuit 2, and the mechanical load parameter of induction motor is gone out in the fitting, utilizes embedded nonlinear fitting algorithm, realizes the detection to induction motor's mechanical load, and whether the mechanical load exists unusually or the trouble of judgement, in time discovers mechanical load unusually or the trouble to send out the early warning, reduce the emergence of mechanical load proruption trouble, improve the utility model discloses a security prolongs induction motor's practical life. Simultaneously, compare with traditional mechanical load's failure diagnosis, the utility model discloses with the mode of minimum invasion, reduce the quantity of sensor, reduced the cost and the cost of installation.
The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
1. An apparatus for induction machine mechanical load identification, characterized by: the device comprises a three-phase sampling circuit, a microprocessor, a communication circuit, a storage circuit and a power circuit; the power circuit is respectively connected with the three-phase sampling circuit and the microprocessor; the three-phase sampling circuit is connected with the microprocessor; the microprocessor is respectively connected with the communication circuit and the storage circuit in a bidirectional way; wherein the content of the first and second substances,
the three-phase sampling circuit is used for sampling and AD converting the three-phase voltage and three-phase current instantaneous values of the induction motor in the primary loop;
the storage circuit is used for storing voltage and current discrete waveform data and mechanical load parameters of the induction motor;
the three-phase sampling circuit samples the discrete waveform data of the three-phase voltage and the three-phase current of the induction motor and inputs the sampled discrete waveform data into the microprocessor;
the microprocessor acquires discrete waveform data of voltage and current of the induction motor in a starting process and a stable operation process within a period of time through the three-phase sampling circuit, and stores the discrete waveform data in the storage circuit;
and the microprocessor processes the acquired discrete waveform data, fits mechanical load parameters of the induction motor, identifies the type of the mechanical load according to the mechanical load parameters, and finally compares the currently identified mechanical load parameters with the previously identified mechanical load parameters for multiple times to judge whether the mechanical load has abnormity or faults.
2. An apparatus for induction machine mechanical load identification as claimed in claim 1, wherein: the communication circuit comprises an Ethernet communication circuit and an RS485 communication circuit, and the Ethernet communication circuit and the RS485 communication circuit are in bidirectional connection with the microprocessor; the Ethernet communication circuit is used for communication between the microprocessor and the upper computer.
3. An apparatus for induction machine mechanical load identification as claimed in claim 2, wherein: the alarm also comprises an audible and visual alarm, and the audible and visual alarm is connected with the RS485 communication circuit; when the mechanical load is abnormal or has faults, the microprocessor outputs an alarm signal to the audible and visual alarm through the RS485 communication circuit, and the audible and visual alarm carries out local audible and visual alarm according to the alarm signal.
4. An apparatus for induction machine mechanical load identification as claimed in claim 1, wherein: the microprocessor is an AM3358 embedded microprocessor.
5. An apparatus for induction machine mechanical load identification as claimed in claim 1, wherein: the clock circuit is connected with the microprocessor in a bidirectional mode and used for providing clock pulse signals for the microprocessor.
6. An apparatus for induction machine mechanical load identification as claimed in claim 5 wherein: and the power supply circuit is used for supplying power to the three-phase sampling circuit, the microprocessor, the communication circuit, the storage circuit and the clock circuit.
7. An apparatus for induction machine mechanical load identification as claimed in claim 1, wherein: the types of mechanical loads are classified into constant power loads, constant torque loads, and quadratic loads.
8. An apparatus for induction machine mechanical load identification as claimed in claim 1, wherein: the mechanical load parameters include rotational speed, slip and power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922314099.3U CN211627764U (en) | 2019-12-20 | 2019-12-20 | Device for identifying mechanical load of induction motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922314099.3U CN211627764U (en) | 2019-12-20 | 2019-12-20 | Device for identifying mechanical load of induction motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211627764U true CN211627764U (en) | 2020-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922314099.3U Active CN211627764U (en) | 2019-12-20 | 2019-12-20 | Device for identifying mechanical load of induction motor |
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| CN (1) | CN211627764U (en) |
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- 2019-12-20 CN CN201922314099.3U patent/CN211627764U/en active Active
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