CN115963396A - Passive permanent magnet motor set efficiency measuring device and method - Google Patents
Passive permanent magnet motor set efficiency measuring device and method Download PDFInfo
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Abstract
The application discloses a passive efficiency measuring device of a permanent magnet motor set, which comprises a plurality of multifunctional sensors and a calculating unit; the multifunctional sensor is used for acquiring the surface temperature of a motor of the motor unit, the temperature of a cooling medium and the flow of the cooling medium; the computing unit is to: calculating the surface temperature difference of the motor, the temperature rise of a cooling medium of the motor and the flow of the cooling medium; calculating heat loss based on the surface temperature difference of the motors, the temperature rise of the cooling medium and the flow of the cooling medium, and calculating the efficiency of each motor and the average efficiency of the motor set according to the total power of the motors and the heat loss. The invention can realize long-term and stable self-power supply of the device, does not need to charge or replace batteries, realizes the efficient reutilization of waste energy while not influencing the work of the motor, reduces the economic cost, the resource waste and the labor cost, can accurately calculate the working efficiency of each motor and the average working efficiency of the motor unit, and realizes unified monitoring.
Description
Technical Field
The application relates to the technical field of motor measurement, in particular to a passive efficiency measuring device and method for a permanent magnet motor set.
Background
Along with the development of hydraulic engineering, the grouping of the motor is trended. In practical engineering, compared with a single motor, the motor unit has the advantages of stable work, high adaptability, less oscillation, low noise and the like. However, the larger the motor grouping scale is, the more the power consumption is increased, the more the energy consumption is wasted, the more the energy is not economical and environment-friendly, and therefore the energy efficiency level of the motor is more emphasized. Therefore, how to measure the efficiency of the motor unit becomes urgent. However, the method for measuring the efficiency of a single motor by engineers cannot be completely moved into the monitoring of the motor unit. The existing measurement of the efficiency of the motor unit is still in a relatively original stage, and the defects are as follows:
1. each motor measuring device needs an independent power supply device, and a worker needs to frequently replace a power supply to ensure the stable work of the measuring device. The work of each motor measuring device in the set is not related, the electricity consumption time is inconsistent, and the electricity consumption is different: the tedious and repeated battery replacement work can cause manpower waste, economic waste and resource waste. The negative effects of the above problems can be weakened to some extent by the scheme of centralized power supply and power line unified power distribution, but the scheme brings new problems: one is that a portion of the power is lost in the circuit and the other is that the unreliability of the circuit increases the risk of repair and damage checks.
2. The power supply is often unstable in power supply, which is related to insufficient strength of power supply materials, overlong working time, and overheating or moisture in the environment, and can affect the measurement accuracy of the subsequent sensor, and higher requirements are provided for the robustness of the sensor.
3. The most common monitoring scheme of the motor is that a monitoring controller is independently arranged on each motor, and the measurement and calculation results of the working parameters of the monitoring controller are usually stored in the monitoring side of the motor, so that the calculation load of a processor is increased, and the monitoring controller is not accurate and inconvenient because workers need to perform periodic spot check in actual engineering. The technical scheme of transmitting the motor efficiency data to the switchboard in real time by using the data cable is difficult to realize stably and reliably for a long time due to the complex wiring structure and the severe wiring environment of the motor unit, and cannot be popularized and used.
For the motor unit with the same load, the motors in the group are close to each other in space, are mutually connected in circuit and mutually influence each other in operation. Therefore, the measurement of the efficiency of the motor unit and the measurement of the efficiency of the single motor cannot be summarized at all. As important parameters for improving economic benefits, saving green energy and protecting ecological environment, how to stably and conveniently measure the efficiency of the motor unit for a long time becomes a problem to be solved urgently.
Disclosure of Invention
Aiming at least one defect or improvement requirement in the prior art, the invention provides a passive efficiency measuring device for a permanent magnet motor set, which can realize long-term stable self-power supply of the device without charging or replacing batteries, realizes efficient reutilization of waste energy while not influencing the work of the motor, and reduces economic cost, resource waste and labor cost.
To achieve the above object, according to a first aspect of the present invention, there is provided a passive efficiency measuring device for a permanent magnet motor set, the device comprising a plurality of multifunctional sensors and a computing unit; wherein, the first and the second end of the pipe are connected with each other,
the multifunctional sensors are arranged at the beginning and the end of a motor refrigeration pipeline and used for collecting heat data and flow data of the motor set, the heat data at least comprises the surface temperature of the motor and the temperature of a cooling medium, and the flow data at least comprises the flow of the cooling medium;
the calculating unit is used for receiving the heat data and the flow data and calculating as follows:
calculating a surface temperature difference of the motor based on the surface temperatures of the start end and the end of the motor refrigeration pipeline, calculating a temperature rise of a cooling medium of the motor based on the cooling medium temperatures of the start end and the end of the motor refrigeration pipeline, and calculating a flow rate of the cooling medium of the motor based on the flow rates of the cooling medium of the start end and the end of the motor refrigeration pipeline;
calculating heat loss based on the surface temperature difference of the motors, the temperature rise of the cooling medium and the flow of the cooling medium, and calculating the efficiency of each motor and the average efficiency of the motor group according to the total power of the motors and the heat loss.
Furthermore, the passive efficiency measuring device for the permanent magnet motor set further comprises a wireless transmission module, wherein the wireless transmission module comprises a terminal node, and the terminal node is connected with the multifunctional sensor and used for acquiring the heat data and the flow data acquired by the multifunctional sensor.
Further, the passive efficiency measuring device for the permanent magnet motor set further comprises a coordinator, wherein the coordinator is connected with the terminal node and is used for receiving the heat data and the flow data uploaded by the terminal node and sending the heat data and the flow data to the computing unit in series.
Further, the above passive efficiency measurement apparatus for a permanent magnet motor set, wherein the calculating of the heat loss based on the surface temperature difference of the motor, the temperature rise of the cooling medium, and the flow rate of the cooling medium, and the calculating of the efficiency of each motor and the average efficiency of the motor set according to the total power of the motor and the heat loss specifically include:
calculating the convection heat dissipation loss between the motor and the ambient air according to the surface temperature difference of the motor;
calculating the internal loss taken away by the cooling medium according to the temperature rise of the cooling medium, the flow rate of the cooling medium and the density of the cooling medium;
the efficiency of each motor and the average efficiency of the motor group are calculated from the losses of the motor in convection with the ambient air, the internal losses carried away by the cooling medium and the total power of the motor.
Further, above-mentioned passive permanent magnet motor group efficiency measuring device, wherein, still include the non-invasive module of getting energy, the non-invasive module of getting energy includes the non-invasive magnetic core of starfish type, the main part of the non-invasive magnetic core of starfish type sets up to star type magnetic core fossil fragments, the non-invasive magnetic core of starfish type still includes that five excitation core posts fill between the star type magnetic core fossil fragments.
Further, according to the efficiency measuring device of the passive permanent magnet motor set, the starfish-shaped non-invasive magnetic core is placed around the power transmission cable of the motor, and a space magnetic field around the power transmission cable of the motor generates induced electromotive force and induced current on a magnetic core winding, so that dissipated magnetic energy is converted into electric energy.
Further, the passive efficiency measuring device for the permanent magnet motor set further comprises an energy conversion module, wherein the energy conversion module is connected with the non-invasive energy taking module and used for receiving the disordered electric energy output by the non-invasive energy taking module, rectifying, filtering, processing and storing the disordered electric energy, and using the processed electric energy to supply power to the multifunctional sensor and the terminal wireless transmission module.
Further, in the passive efficiency measurement device for the permanent magnet motor set, the energy conversion module includes a charging circuit and an energy storage circuit; wherein the content of the first and second substances,
the charging circuit comprises a power management chip and is used for realizing overcharge protection, discharge protection and electric energy monitoring;
the energy storage circuit is connected with the charging circuit, comprises a super capacitor and is used for storing electric energy released by the charging circuit and supplying power to the multifunctional sensor and the wireless transmission module.
According to a second aspect of the present invention, there is also provided a passive permanent magnet motor set efficiency measurement method, the method comprising:
respectively arranging multifunctional sensors at the beginning and the end of a motor refrigeration pipeline, and acquiring heat data and flow data of a motor unit, wherein the heat data at least comprises the surface temperature of a motor and the temperature of a cooling medium, and the flow data at least comprises the flow of the cooling medium;
calculating a surface temperature difference of the motor based on the surface temperatures of the start end and the end of the motor refrigeration pipeline, calculating a temperature rise of a cooling medium of the motor based on the cooling medium temperatures of the start end and the end of the motor refrigeration pipeline, and calculating a flow rate of the cooling medium of the motor based on the flow rates of the cooling medium of the start end and the end of the motor refrigeration pipeline;
calculating heat loss based on the surface temperature difference of the motors, the temperature rise of the cooling medium and the flow of the cooling medium, and calculating the efficiency of each motor and the average efficiency of the motor group according to the total power of the motors and the heat loss.
Further, the method for measuring efficiency of the passive permanent magnet motor set further includes:
the starfish-shaped non-invasive magnetic core is placed around the motor power transmission cable, and a space magnetic field around the motor power transmission cable generates induced electromotive force and induced current on a magnetic core winding to convert dissipated magnetic energy into electric energy;
and carrying out rectification filtering processing and storage on the electric energy, and supplying power to the multifunctional sensor.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) According to the passive efficiency measuring device and method for the permanent magnet motor unit, the multifunctional sensor is placed outside the motor to collect the heat data and the flow data of the motor unit, so that the normal work of the motor is not influenced, the working efficiency of the motor is improved, the working efficiency of each motor and the average working efficiency of the motor unit can be accurately calculated, and unified monitoring is realized.
(2) According to the passive efficiency measuring device and method for the permanent magnet motor set, the small non-invasive energy taking module based on the space magnetic field supplies power to the improved low-power-consumption sensor and the improved low-power-consumption wireless transmission module, so that long-term stable self-power supply of the device can be realized, and a battery does not need to be charged or replaced. The waste energy is efficiently reused while the work of the motor is not influenced, and the economic cost, the resource waste and the labor cost are reduced;
(3) According to the passive efficiency measuring device and method for the permanent magnet motor unit, the intelligent, stable and integrated small energy conversion module is adopted, so that efficient energy receiving, energy storage and energy transmission are realized in real time, the stability of power supply is enhanced, the use precision of a multifunctional sensor is improved, and the service life of the whole device is prolonged;
(4) The passive efficiency measuring device and method for the permanent magnet motor set provided by the invention adopt the ZigBee Internet of things technology to realize centralized transmission and unified processing of hundreds of sensor data. The mode enables the staff to master the dynamic condition of the large-scale motor unit within the range of hundreds of meters at the monitoring center, saves unnecessary work and improves the working efficiency of the staff.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a passive permanent magnet motor efficiency measurement apparatus according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a starfish-type non-invasive core and windings;
fig. 3 is a schematic diagram of a rectifying and filtering circuit provided in an embodiment of the present application;
fig. 4 is a schematic connection diagram of an ADP5092 chip provided in an embodiment of the present application;
fig. 5 is a circuit diagram of setting parameters of an ADP5092 chip according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a tank circuit provided in an embodiment of the present application;
fig. 7 is a graph of an output voltage waveform of an energy conversion module according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a voltage regulator circuit according to the present embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The terms "first," "second," "third," and the like in the description and claims of this application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
In one aspect, the present application provides a passive measuring device for measuring efficiency of a permanent magnet motor set stably and conveniently for a long time, and fig. 1 is a schematic structural diagram of the passive measuring device for efficiency of a permanent magnet motor according to an embodiment of the present application. Referring to fig. 1, the apparatus includes a plurality of multi-function sensors and a computing unit.
The multifunctional sensors with low power consumption are arranged at the heat insulation connection positions of the refrigerating pipeline interfaces of the motors, each motor is respectively arranged at the starting end and the tail end of the refrigerating pipeline, and all data of subsequent efficiency calculation can be obtained by only two sensors of each motor by specifically selecting the sensors and setting the sensors at the starting end and the tail end of the refrigerating pipeline of the motor. In order to reduce power consumption, the sensor is dormant at most of time, and heat data and flow data are obtained by measuring at intervals of fixed duration, wherein the heat data and the flow data at least comprise: the surface atmospheric temperature of the motor, the temperature of the cooling medium and the flow rate of the cooling medium.
In order to improve the accuracy of the measurement result, the refrigeration method used by the motor unit is specifically designed into a mode of using a multi-cycle radiating pipe and adding high-efficiency refrigerant, and the cooling medium can take away most of heat generated by the operation of the motor.
The calculating unit processes the received heat data and flow data of the sensor, and calculates the efficiency of each motor and the efficiency of the motor set based on a calorimetric method, wherein the calculating process is as follows:
defining the surface temperature of the motor acquired by the multifunctional sensor each time as T air The temperature of the cooling medium is T liquid The flow rate of the cooling medium is Q;
the surface temperature difference of the ith motor is as follows:
wherein, Δ t ai Is the surface temperature difference of the motor, T basic Is the ambient temperature, T, at which the motor is located air.i.before Motor surface temperature, T, collected for a multifunction sensor located at the beginning of the motor air.i.after The motor surface temperature is acquired by a multifunctional sensor positioned at the tail end of the motor, and i is a positive integer;
the temperature rise of the cooling medium of the ith motor is as follows:
Δt li ＝T liquid.i.before -T liquid.i.after
wherein, Δ t li For the temperature rise of the cooling medium of the motor, T liquid.i.before Temperature, T, of the cooling medium picked up by a multifunction sensor located at the beginning of the motor liquid.i.after The temperature of the cooling medium collected for a multifunction sensor located at the end of the motor;
the flow rate of the cooling medium of the ith motor is as follows:
wherein Q is i Flow rate of cooling medium for motor, Q i.before Flow of cooling medium, Q, collected for a multifunction sensor located at the beginning of the motor i.after The flow of the cooling medium collected by a multifunctional sensor positioned at the tail end of the motor;
and constructing a heat data and flow data parameter sequence of the motor unit according to the surface temperature rise, the cooling medium temperature rise and the cooling medium flow of each motor, wherein the three sequences store energy efficiency information of each motor in the motor unit. The heat data and flow data parameters of the motor unit are listed as follows:
wherein n represents the number of motors in the motor set, n is a positive integer, Δ t a Is a motor surface temperature difference array, delta t, of a motor unit l The temperature rise sequence of the cooling medium of the motor unit is shown, and Q is the flow sequence of the cooling medium of the motor unit.
For the above heat data and flow data parameters, the calculation unit uses a simplified calorimetry based algorithm to calculate the efficiency.
For motor number i, the internal losses carried away by the cooling medium are estimated as:
P mi ＝C p Q i ρΔt li
wherein, P mi With cooling medium carrying away for motor iThe internal loss, ρ, is the density of the cooling medium. For the motor numbered i, the loss of convective heat dissipation from the ambient air is estimated as:
P si ＝hAΔt ai
wherein, P si The heat dissipation coefficient is the loss of the I-type motor and the convection heat dissipation of the surrounding air, h is the heat dissipation coefficient of the shell surface of the motor, and 14W/(m ^2 · k) is taken, A is the heat dissipation surface area of the shell of the motor and is a fixed value.
It is known that for the motor numbered i, the efficiency calculation formula is:
wherein eta is i Motor efficiency of motor No. i, P i For the total power of motor i, ∑ p i The total losses of the motor of the number i comprise bearing friction, brush wear and other losses.
Because the motor adopts permanent magnet drive, excitation loss does not exist; because the motor is cooled by adopting a multi-cycle radiating pipe and high-efficiency refrigerant, air blast radiating is not required to be additionally arranged; furthermore, a bearing friction P is specified mechi Stray losses P such as brush wear trayi Is a fixed value and other small losses are ignored. At this time, for the motor numbered i, the efficiency is estimated as:
thus, a motor unit efficiency sequence η including n motors is obtained as follows:
the average efficiency of the motor set is as follows:
furthermore, the calculating unit is connected with an upper computer, uploads the efficiency array of the motor unit and the average efficiency of the motor unit to the upper computer, is displayed in a centralized manner through a display of the upper computer, and reports the efficiency array and the average efficiency of the motor unit to workers in real time through an electronic display screen and/or voice playing.
Furthermore, the passive efficiency measuring device of the permanent magnet motor set further comprises a wireless transmission module and a monitoring center, wherein the wireless transmission module comprises a plurality of terminal nodes and a coordinator, the terminal nodes are located on one side of the motor and connected with the multifunctional sensor, and the wireless transmission module is used for acquiring heat data and flow data acquired by the multifunctional sensor. The coordinator is connected with the terminal node and is used for receiving the heat data and the flow data uploaded by the terminal node and serially transmitting the heat data and the flow data to the computing unit. Wherein, the coordinator can be arranged in the monitoring center and is used for facilitating the observation of the data.
A plurality of terminal nodes and a coordinator are constructed based on the ZigBee Internet of things technology and are used for data transmission and monitoring, the terminal nodes and the coordinator are connected through a star network topology, and remote information interaction of at most 256 devices in 100m can be achieved.
Furthermore, the passive efficiency measuring device for the permanent magnet motor set further comprises a non-invasive energy taking module, the non-invasive energy taking module obtains electric energy in the space magnetic field to replace a battery and a transmission cable, redundant energy in the space magnetic field can be efficiently converted into micro electric energy while the work of the motor is not influenced, and waste energy dissipated in the space is recycled.
The existing passive devices can obtain energy in various ways, one of them is magnetic field energy obtaining, that is, electric energy is obtained by using a magnetic electricity generating method, which usually uses a closed magnetic ring similar to an iron ring to surround a live wire, that is, an invasive magnetic core, which brings problems, for example:
(1) The magnetic ring is difficult to install: for a closed magnetic ring, the current practical engineering practice is to install the electrified lead before use, but in general, the electrified lead includes various shapes such as a cuboid, a cylinder and a disk, and has different sizes, and the sizes of the electrified lead and the magnetic ring are difficult to be completely matched, so that the installation is difficult; (2) the magnetic ring is easy to damage: the intrusive type magnetic core has a complete closed magnetic circuit, so that the intrusive type magnetic core has the advantages of small magnetic leakage resistance, large magnetomotive force and high power transformation efficiency, but the closed magnetic ring is easy to collide or overheat and damage, the transformation efficiency of the magnetic core is greatly reduced due to the existence of an air gap, and the magnetic core is not beneficial to engineering use; (3) The closed magnetic ring is buckled on the motor transmission cable, so that lasting mechanical stress can be brought to the transmission cable, the cable aging is accelerated, and the closed magnetic ring is uneconomical and unsafe.
Specifically, in order to reduce the demagnetizing field as far as possible, improve and get the ability effect, this application adopts starfish type non-invasive magnetic core, and figure 2 is the starfish type non-invasive magnetic core and the winding schematic diagram that this application embodiment provided, and the main part of starfish type non-invasive magnetic core is star type magnetic core fossil fragments, starfish type non-invasive magnetic core still includes that five excitation core posts fill between the star type magnetic core fossil fragments. The cross section of the magnetic core is in a starfish shape as a whole. The core is made of ferrite having a high magnetic permeability and relatively inexpensive manufacturing cost. Compared with other types of non-invasive magnetic cores, the magnetic core has the following advantages: the sectional area of the magnetic core is reduced integrally, and the power density is improved; the detachable shape is regular and repeated, and the manufacturing and the transportation are convenient; the heat dissipation area is increased, and the phenomenon of overheating damage of the magnetic core is improved; the structural strength is improved, and the mechanical property is more excellent.
This application assembles the ability to the magnetic field through COMSOL emulation to different magnetic core structures and analyzes, and under the same draw ratio, the effective magnetic permeability of starfish type non-invasive magnetic core has improved 27.1%, and simultaneously, power density has promoted 33.8%, is higher than the non-invasive magnetic core of general shape far away, in addition, also has the advantage than the magnetic core for the existing engineering in mechanical properties, heat-sinking capability, price/performance ratio.
Furthermore, the passive efficiency measuring device of the permanent magnet motor set further comprises an energy conversion module, wherein the energy conversion module is connected with the non-invasive energy taking module and used for receiving, processing and storing the electric energy output by the non-invasive energy taking module and supplying power to the multifunctional sensor and the terminal wireless transmission module.
Specifically, the energy conversion module comprises a rectifying filter circuit, a charging circuit and an energy storage circuit.
Fig. 3 is a schematic diagram of a rectifier and filter circuit provided in the embodiment of the present application, and the scattered electric energy output by the non-invasive energy-taking module enters the rectifier and filter circuit through a source/Header1 port, and sequentially passes through a matching impedance capacitor, a rectifier bridge and a filter capacitor in the rectifier and filter circuit to perform preliminary treatment on the scattered and scattered electric current, so as to ensure the normal operation of the subsequent charging circuit.
The charging circuit is connected with the rectifying and filtering circuit and the energy storage circuit, comprises a power management chip and a parameter setting circuit and is used for realizing overcharge protection, discharge protection and electric energy monitoring.
In a specific embodiment, the power management chip is an ADP5092 chip, fig. 4 is a schematic connection diagram of the ADP5092 chip provided in the embodiment of the present application, and fig. 5 is a circuit diagram for setting parameters of the ADP5092 chip provided in the embodiment of the present application, please refer to fig. 4 and fig. 5. The primarily processed current enters an ADP5092 chip through a VIN port, and the ADP5092 chip can limit the output current, so that the energy conversion efficiency is further improved.
Fig. 6 is a schematic diagram of an energy storage circuit provided in an embodiment of the present application, where the energy storage circuit is connected to a charging circuit, and the energy storage circuit includes a super capacitor, and is used to store electric energy released by the charging circuit and supply power to the multifunctional sensor and the wireless transmission module.
Fig. 7 is an output voltage waveform diagram of the energy conversion module provided in the embodiment of the present application, the parameter setting circuit controls the discharge voltage of the super capacitor to be between 3.3V and 5V, and the voltage interval of 3.3V to 5V is adapted to the sensor and the wireless transmission module, so that the working stability of the super capacitor can be improved, and the service life of the super capacitor can be prolonged. And the discharge voltage is similar to triangular wave, the similar triangular wave can obviously improve the energy utilization efficiency, and the subsequent sensor can sleep at regular time, so that the sensor is suitable for long-term use.
Further, the energy conversion module further includes a voltage stabilizing circuit, fig. 8 is a schematic diagram of the voltage stabilizing circuit provided in this embodiment, the voltage stabilizing circuit is a Buck-Boost circuit constructed based on a TPS63070 chip as a core, voltage stabilization and power supply are realized by the voltage stabilizing circuit, efficiency of the voltage stabilizing circuit can reach more than 95%, loss is low, energy consumption level can be further reduced, and energy conversion efficiency is improved.
In a specific embodiment, the energy conversion module is designed as a printed circuit board which is connected with the winding wound on the starfish-type non-invasive magnetic core and is attached to the surface of the starfish-type non-invasive magnetic core.
In another aspect, the present application provides a method for measuring efficiency of a passive permanent magnet motor set, including the steps of:
(1) The starfish-shaped non-invasive magnetic core is placed around the motor power transmission cable, and a space magnetic field around the motor power transmission cable generates induced electromotive force and induced current on a magnetic core winding to convert dissipated magnetic energy into electric energy;
(2) Respectively arranging multifunctional sensors at the beginning and the end of a motor refrigeration pipeline, and acquiring heat data and flow data of a motor unit, wherein the heat data and the flow data at least comprise one or more of the surface temperature of a motor, the temperature of a cooling medium and the flow of the cooling medium;
(3) Rectifying and filtering the converted scattered and disorderly electric energy, storing the electric energy by using a super capacitor, supplying power to the multifunctional sensor, and awakening the multifunctional sensor at a fixed time to realize the timing measurement of the multifunctional sensor;
(4) Calculating the surface temperature difference of the motor based on the surface temperature of the starting end and the tail end of the motor refrigeration pipeline, calculating the temperature rise of the cooling medium of the motor based on the temperature of the cooling medium of the starting end and the tail end of the motor refrigeration pipeline, and calculating the flow rate of the cooling medium of the motor based on the flow rate of the cooling medium of the starting end and the tail end of the motor refrigeration pipeline;
(5) Calculating heat loss based on the surface temperature difference of the motors, the temperature rise of the cooling medium and the flow of the cooling medium, calculating the efficiency of each motor and the average efficiency of the motor set according to the total power of the motors and the heat loss, uploading the efficiency series of the motor sets and the average efficiency of the motor sets to an upper computer, displaying the efficiency series and the average efficiency of the motor sets in a centralized manner through a display of the upper computer, and reporting the efficiency series and the average efficiency of the motor sets to workers in real time through an electronic display screen and/or voice playing.
It should be noted that for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts, but those skilled in the art should understand that the present application is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art will recognize that the embodiments described in this specification are preferred embodiments and that acts or modules referred to are not necessarily required for this application.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some service interfaces, devices or units, and may be an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above description is merely an exemplary embodiment of the present disclosure, and the scope of the present disclosure is not limited thereto. That is, all equivalent changes and modifications made in accordance with the teachings of the present disclosure are intended to be included within the scope of the present disclosure. Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A passive efficiency measuring device of a permanent magnet motor set is characterized by comprising a plurality of multifunctional sensors and a calculating unit; wherein the content of the first and second substances,
the multifunctional sensors are arranged at the beginning and the end of a motor refrigeration pipeline and used for collecting heat data and flow data of the motor set, the heat data at least comprises the surface temperature of the motor and the temperature of a cooling medium, and the flow data at least comprises the flow of the cooling medium;
the calculating unit is used for receiving the heat data and the flow data and calculating as follows:
calculating the surface temperature difference of the motor based on the surface temperature of the starting end and the tail end of the motor refrigeration pipeline, calculating the temperature rise of the cooling medium of the motor based on the temperature of the cooling medium of the starting end and the tail end of the motor refrigeration pipeline, and calculating the flow rate of the cooling medium of the motor based on the flow rate of the cooling medium of the starting end and the tail end of the motor refrigeration pipeline;
calculating heat loss based on the surface temperature difference of the motors, the temperature rise of the cooling medium and the flow of the cooling medium, and calculating the efficiency of each motor and the average efficiency of the motor group according to the total power of the motors and the heat loss.
2. The passive permanent magnet motor set efficiency measuring device according to claim 1, further comprising a wireless transmission module, wherein the wireless transmission module comprises a terminal node, and the terminal node is connected with the multifunctional sensor and used for acquiring heat data and flow data acquired by the multifunctional sensor.
3. The passive permanent magnet motor set efficiency measuring device of claim 2, wherein the wireless transmission module further comprises a coordinator, the coordinator is connected with the terminal node, and is used for receiving the heat data and the flow data uploaded by the terminal node and serially transmitting the heat data and the flow data to the computing unit.
4. The passive permanent magnet motor set efficiency measuring apparatus according to claim 1, wherein said calculating heat loss based on the surface temperature difference of the motor, the temperature rise of the cooling medium and the flow rate of the cooling medium, and calculating the efficiency of each motor and the average efficiency of the motor set based on the total power of the motor and the heat loss specifically comprises:
calculating the convection heat dissipation loss between the motor and the ambient air according to the surface temperature difference of the motor;
calculating the internal loss taken away by the cooling medium according to the temperature rise of the cooling medium, the flow rate of the cooling medium and the density of the cooling medium;
the efficiency of each motor and the average efficiency of the motor group are calculated from the losses of the motor in convection with the ambient air, the internal losses carried away by the cooling medium and the total power of the motor.
5. The passive permanent magnet motor set efficiency measuring apparatus of claim 1, further comprising a non-invasive energy-taking module, wherein the non-invasive energy-taking module comprises a starburst-type non-invasive magnetic core, the starburst-type non-invasive magnetic core is mainly a starburst-type magnetic core keel, and the starburst-type non-invasive magnetic core further comprises five excitation core columns filled between the starburst-type magnetic core keels.
6. The passive permanent magnet motor assembly efficiency measurement device according to claim 5 wherein said starburst non-invasive core is placed around the motor power cable and the space magnetic field around the motor power cable generates induced electromotive and inductive currents on the core windings that convert the dissipated magnetic energy into electrical energy.
7. The passive pm motor assembly efficiency measuring apparatus of claim 6, further comprising an energy conversion module, said energy conversion module being connected to said non-invasive energy-taking module for receiving the chaotic electric energy outputted from the non-invasive energy-taking module, rectifying, filtering, storing and using the processed electric energy to power said multifunctional sensor and said wireless transmission module.
8. A passive permanent magnet motor set efficiency measuring device according to claim 2 or 7, wherein the energy conversion module comprises a charging circuit and a tank circuit; wherein the content of the first and second substances,
the charging circuit comprises a power management chip and is used for realizing overcharge protection, discharge protection and electric energy monitoring;
the energy storage circuit is connected with the charging circuit, the energy storage circuit comprises a super capacitor and is used for storing electric energy released by the charging circuit and supplying power to the multifunctional sensor and the wireless transmission module.
9. A method for measuring the efficiency of a passive permanent magnet motor unit is characterized by comprising the following steps:
respectively arranging multifunctional sensors at the beginning and the end of a motor refrigeration pipeline, and acquiring heat data and flow data of a motor unit, wherein the heat data at least comprises the surface temperature of a motor and the temperature of a cooling medium, and the flow data at least comprises the flow of the cooling medium;
calculating the surface temperature difference of the motor based on the surface temperature of the starting end and the tail end of the motor refrigeration pipeline, calculating the temperature rise of the cooling medium of the motor based on the temperature of the cooling medium of the starting end and the tail end of the motor refrigeration pipeline, and calculating the flow rate of the cooling medium of the motor based on the flow rate of the cooling medium of the starting end and the tail end of the motor refrigeration pipeline;
calculating heat loss based on the surface temperature difference of the motors, the temperature rise of the cooling medium and the flow rate of the cooling medium, and calculating the efficiency of each motor and the average efficiency of the motor set according to the total power of the motors and the heat loss.
10. The passive permanent magnet motor set efficiency measuring method of claim 9, further comprising:
the starfish-shaped non-invasive magnetic core is placed around the motor power transmission cable, and a space magnetic field around the motor power transmission cable generates induced electromotive force and induced current on a magnetic core winding to convert dissipated magnetic energy into electric energy;
and carrying out rectification filtering processing and storage on the electric energy, and supplying power to the multifunctional sensor.
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