CN113009340B - Motor temperature rise testing device, testing control method thereof and controller - Google Patents
Motor temperature rise testing device, testing control method thereof and controller Download PDFInfo
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- CN113009340B CN113009340B CN202110277052.3A CN202110277052A CN113009340B CN 113009340 B CN113009340 B CN 113009340B CN 202110277052 A CN202110277052 A CN 202110277052A CN 113009340 B CN113009340 B CN 113009340B
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- G—PHYSICS
- 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
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
- G05B19/0425—Safety, monitoring
Abstract
The application relates to a motor temperature rise testing device, a testing control method thereof and a controller. Wherein, motor temperature rise testing arrangement, through with the controller respectively with the control end of converter, resistance measurement module's output, temperature measurement module's output and switching module's control end electric connection, adopt the automatic control mode, control converter and switching module's state, can realize the cold state winding resistance when the motor that awaits measuring does not start and the automatic measure of environmental temperature when experimental begins, and the hot winding resistance after the motor operation and the automatic measure of environmental temperature after the motor operation finishes, can also be according to the temperature rise of the environmental temperature who obtains and resistance value automatic calculation motor. The whole experiment process is free from manual intervention and is automatically executed, the motor stalling and running switching speed is high, the measured data is completely recorded, the consistency is good, and the personal safety threat caused by the fact that the resistor is measured when the motor is not completely stalled in the traditional technology is avoided.
Description
Technical Field
The application relates to the technical field of motor temperature rise testing, in particular to a motor temperature rise testing device, a testing control method and a controller thereof.
Background
The temperature rise of the motor refers to the value of the temperature rise of the winding in the motor after the motor continuously runs for a period of time under a certain load. It is usually calculated by measuring the resistance of the internal windings of the machine. Therefore, temperature rise measurement is actually converted into measurement of winding resistance and ambient temperature.
The temperature rise characteristic curve reflects the heating and radiating characteristics of the motor. The measurement of the temperature rise characteristic curve has important significance for the design work of development departments.
The existing motor temperature rise test mainly depends on manual measurement, a motor is manually stopped, after the motor is confirmed to stop, the resistance and the temperature of a winding are manually measured, and after data are recorded and processed, a characteristic curve is drawn to determine the motor temperature rise.
Disclosure of Invention
In view of the above, it is necessary to provide a motor temperature rise testing apparatus, a testing control method thereof, and a controller, which can automatically perform motor shutdown, operation state switching, and motor temperature rise measurement.
The embodiment of the application provides a motor temperature rise testing arrangement, includes:
the input end of the frequency converter is used for connecting a power supply, and the output end of the frequency converter is used for connecting a motor to be tested;
the resistance measuring module is used for measuring the motor resistance when the motor to be measured is not started and the motor resistance after the operation is finished each time;
the temperature measuring module is arranged close to the motor to be measured and used for measuring the ambient temperature of the motor to be measured;
the first connecting end of the switching module is connected with the output end of the frequency converter, the second connecting end of the switching module is connected with the measuring end of the resistance measuring instrument, and the third connecting end of the switching module is used for connecting a motor to be measured;
the controller is respectively electrically connected with the control end of the frequency converter, the output end of the resistance measuring module, the output end of the temperature measuring module and the control end of the switching module, is used for controlling the switching module to switch between a first state and a second state, and is used for controlling the frequency converter to stop working when the switching module is in the first state; the switching module is also used for controlling the frequency converter to work when in the second state; the controller is also used for obtaining the temperature rise of the motor to be tested according to the motor resistance and the environment temperature when the motor to be tested is not started, and the motor resistance and the environment temperature after the motor to be tested finishes running each time;
in a first state, the switching module disconnects the frequency converter and the motor to be tested and connects the resistance measuring module and the motor to be tested; and in a second state, the switching module is communicated with the frequency converter and the motor to be tested, and is disconnected with the resistance measuring module and the motor to be tested.
The motor temperature rise testing device provided by the embodiment of the application aims to solve the problems of low efficiency, poor data consistency and potential safety hazard of a traditional manual motor temperature rise testing mode, adopts an automatic control mode, utilizes the control capability of a controller to control the working state of a frequency converter so as to further control whether a motor is in a rotating state, because the motor resistance cannot be measured in an electrified mode, the frequency converter is controlled to stop and an output line from the frequency converter to the motor is disconnected, when a test is started, the motor is in a stop state, the resistance measuring module measures the motor resistance at the beginning of the test, the temperature measuring module measures the environmental temperature at the beginning of the test, then the controller controls to cut off a measuring path of the resistance measuring module, a connecting line between the frequency converter and the motor is switched on, the frequency converter is controlled to work, the frequency converter drives the motor to rotate, after the motor works for a period of time, for example, the motor can run for 30 minutes, the output path from the frequency converter to the motor is cut off, the frequency converter is controlled to stop, the measuring path between the resistance measuring module and the motor is switched on again, the measuring path between the motor resistance (the hot winding) and the environmental temperature rise when the motor finishes running, the motor can be measured, the temperature of the motor can be calculated, and the temperature rise can be further calculated according to obtain a formula, and the motor temperature rise calculation formula can be further calculated according to be further calculated. The whole experimental process does not need manual intervention, is automatically executed, has high switching speed of motor stalling and running, complete measurement data record and good consistency, and avoids personal safety threat caused by measuring resistance when the motor is not completely stalled in the traditional technology.
In one embodiment, the switching module comprises:
one end of the first connection module is connected with the output end of the frequency converter, and the other end of the first connection module is used for connecting a motor to be tested;
and one end of the second connecting module is connected with the resistance measuring module, and the other end of the second connecting module is used for connecting a motor to be measured.
In one embodiment, the resistance measurement module comprises:
one end of the resistance meter is connected with the motor to be tested through the second connecting module, and the other end of the resistance meter is connected with the controller.
In one embodiment, the temperature measurement module comprises:
and the thermocouple measuring instrument is connected with the controller and is used for measuring the environment temperature of the motor to be measured.
In one embodiment, the motor temperature rise testing device further comprises:
and the controller is electrically connected with the resistance measuring module and the temperature measuring module respectively through the data connecting module.
In one embodiment, the controller is configured to periodically control the switching module to switch between the first state and the second state.
In one of them embodiment, motor temperature rise testing arrangement still includes:
and the rotating speed measuring instrument is electrically connected with the controller and is used for measuring the rotating speed of the motor to be measured and feeding the rotating speed back to the controller.
The embodiment of the application further provides a motor temperature rise test control method applied to the motor temperature rise test device, which includes:
controlling the switching module to be in a first state and controlling the frequency converter to stop working; in the first state, the switching module disconnects the frequency converter from the motor to be tested and connects the resistance measuring module with the motor to be tested;
acquiring motor resistance when a motor to be detected stops rotating and the environmental temperature of the motor to be detected in a first state;
if the test ending condition is not met, controlling the switching module to switch to the second state and controlling the frequency converter to work; in the second state, the switching module is communicated with the frequency converter and the motor to be tested, and the connection between the resistance measuring module and the motor to be tested is disconnected;
after the module to be switched is switched to the second state and reaches the preset operation time, skipping to execute the step of controlling the switching module to be in the first state and controlling the frequency converter to stop working;
and if the test end condition is met, obtaining the temperature rise of the motor to be tested according to the motor resistance and the environment temperature of the motor to be tested when the motor to be tested is not started, and the motor resistance and the environment temperature of the motor to be tested after the motor to be tested is operated at each time.
In one embodiment, the end-of-test condition is that the motor under test is thermally stable.
A controller comprising a memory and a processor, the memory storing a computer program, the processor implementing the steps of the method when executing the computer program.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a temperature rise test device of a motor according to an embodiment;
FIG. 2 is a schematic of temperature rise test curves in one embodiment;
FIG. 3 is a schematic flow chart of a method for testing temperature rise of a motor according to an embodiment;
FIG. 4 is a schematic structural diagram of a temperature rise testing device of a motor in another embodiment;
fig. 5 is a schematic diagram of the internal structure of the controller according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements should not be limited by these terms. These terms are only used to distinguish one element from another.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
As mentioned in the background art, the motor temperature rise test method in the prior art has the problems of low efficiency and poor measurement consistency, and the inventor researches and discovers that the problems are mainly caused by low manual operation efficiency and poor data measurement consistency caused by level difference of operators.
Based on the above reasons, the present invention provides a motor temperature rise testing apparatus, as shown in fig. 1, including: frequency converter 10, resistance measurement module 40, temperature measurement module 50, switching module 60, and controller 70. The input end of the frequency converter 10 is used for connecting a power supply 20, and the output end of the frequency converter 10 is used for connecting a motor 30 to be tested; the resistance measuring module 40 is used for measuring the motor resistance when the motor 30 to be measured is not started and the motor resistance after each operation is finished; the temperature measuring module 50 is used for measuring the ambient temperature of the motor 30 to be measured; the first connection end of the switching module 60 is connected with the output end of the frequency converter 10, the second connection end of the switching module 60 is connected with the measurement end of the resistance measurement instrument, and the third connection end of the switching module 60 is used for connecting the motor 30 to be measured; the controller 70 is electrically connected to the control end of the frequency converter 10, the output end of the resistance measurement module 40, the output end of the temperature measurement module 50, and the control end of the switching module 60, and the controller 70 is configured to control the switching module 60 to switch between a first state and a second state, and the controller 70 is further configured to control the frequency converter 10 to stop working when the switching module 60 is in the first state; and is also used for controlling the frequency converter 10 to work when the switching module 60 is in the second state; the controller 70 is further configured to obtain the temperature rise of the motor 30 to be measured according to the motor resistance and the ambient temperature of the motor to be measured when the motor to be measured is not started, and the motor resistance and the ambient temperature of the motor to be measured after the motor to be measured finishes running each time; in the first state, the switching module 60 disconnects the frequency converter 10 from the motor 30 to be measured, and connects the resistance measuring module 40 with the motor 30 to be measured; in the second state, the switching module 60 connects the frequency converter 10 and the motor 30 to be tested, and disconnects the resistance measuring module 40 and the motor 30 to be tested.
The frequency converter 10 is a power control device that controls an ac motor by applying a frequency conversion technology and a microelectronic technology and changing a frequency of a motor operating power supply 20. The resistance measuring module 40 refers to a device capable of measuring the magnitude of resistance, and the device may be formed as a single device or an integrated module formed by multiple devices. The temperature measurement module 50 may be formed by a single measurement instrument, or may be an integrated module including a plurality of integrated circuits such as a measurement instrument and a protection circuit. The motor resistance refers to a motor winding resistance, and the resistance measured by the resistance measuring module 40 is a resistance in a motor stalling state, which may be a resistance when the motor is not started yet, or a resistance when the motor finishes running after a period of time and the rotating speed is zero. The switching module 60 refers to a module capable of controllably changing the communication state of the passage therein to realize switching of different branches. For example, the switching module 60 may be a contactor or the like. The controller 70 may be a device having data acquisition, data processing, and control command generation functions, such as an upper computer, an embedded panel, and a single chip microcomputer.
The embodiment of the application provides a motor temperature rise testing arrangement, in order to solve the problem that traditional artifical motor temperature rise test mode's inefficiency, data uniformity are poor and have the potential safety hazard. Specifically, when the test is started, the controller 70 maintains the frequency converter 10 to be stopped, the connection path between the frequency converter 10 and the motor 30 to be tested in the switching module 60 is disconnected, at this time, the rotation speed of the motor is zero, the controller 70 controls to open the connection path between the resistance measuring module 40 and the motor in the switching module 60, the resistance measuring module 40 measures the resistance R0 of the motor winding, and the temperature measuring module 50 measures the ambient temperature T0. After the data measurement of R0 and T0 is completed, the controller 70 obtains R0 and T0, then controls to disconnect the connection path between the resistance measurement module 40 and the motor in the switching module 60, controls to open the connection path between the frequency converter 10 and the motor 30 to be measured in the switching module 60, controls the frequency converter 10 to work, and starts the motor to operate according to the set load. Whole switching process need not artifical the intervention, can realize automatic switch-over, and switching process completion time can be controlled below 15S, and the switching process is fast, compares in artifical mode, and efficiency is higher.
After the motor 30 to be tested operates for a period of time, for example, 30 minutes commonly taken in a motor temperature rise test, the motor 30 to be tested has operated for a period of time, the winding temperature rises, at this time, the controller 70 controls the frequency converter 10 to stop operating, and the operating state of the switching module 60 is controlled to cut off the connection path between the frequency converter 10 and the motor 30 to be tested, the connection path between the resistance measurement module 40 and the motor is opened after the motor stops operating, the resistance measurement module 40 measures the thermal winding resistance Rn of the motor 30 to be tested, the temperature measurement module 50 collects the test environment temperature Tn after the motor finishes operating, and then the controller 70 can calculate the temperature rise of the motor 30 to be tested according to the obtained R0, T0, rn, and Tn.
The formula for calculating the temperature rise is delta T = (Rn-R0)/R0 x (K + T0) - (Tn-T0), wherein delta T is the temperature rise of the motor 30 to be measured, R0 is the resistance of the motor 30 to be measured at the beginning of the temperature rise test, and T0 is the environment temperature of the motor 30 to be measured at the beginning of the temperature rise test; rn is a thermal winding resistance Tn of the motor 30 to be measured after the operation of each time is finished, and Tn is an ambient temperature of the motor 30 to be measured after the operation of each time is finished. K is 234.5 when the winding of the motor 30 to be measured is copper, and is 225 when the winding of the motor 30 to be measured is aluminum.
The controller 70 can generate a temperature rise characteristic curve according to the obtained temperature rise, so that a user can know the temperature rise of the motor 30 to be measured more intuitively.
The motor temperature rise testing device provided by the embodiment of the application adopts an automatic control mode, utilizes the control capability of the controller 70 to control the states of the frequency converter 10 and the switching module 60, can realize the automatic measurement of the cold winding resistance R0 of the motor 30 to be tested and the environmental temperature T0 at the beginning of the test, and can also automatically calculate the temperature rise of the motor 30 to be tested, wherein the automatic measurement of the hot winding resistance Rn of the motor and the environmental temperature Tn after the motor runs. The whole experimental process does not need manual intervention, is automatically executed, has high switching speed of motor stalling and running, complete measurement data record and good consistency, and avoids personal safety threat caused by measuring resistance when the motor is not completely stalled in the traditional technology. The motor temperature rise testing arrangement that this application embodiment provided, this motor that awaits measuring can be the operation motor of elevator. Carry out the temperature rise test of elevator motor through the device, have important reference meaning to the elevator research and development in-process, further promote elevator operation security.
In one embodiment, the switching module 60 may be a contactor, the contactor includes three normally open contacts and three normally closed contacts, the normally open contacts may be correspondingly connected to the frequency converter 10 and the motor 30 to be measured, the normally closed contacts may be correspondingly connected to the motor 30 to be measured and the resistance measuring module 40, after R0 and T0 are measured, the controller 70 may control the coil of the contactor to be energized, the coil current generates a magnetic field, the magnetic field causes the static iron core to generate electromagnetic attraction to attract the moving iron core and drive the contactor to move, the normally open contacts are closed, and the normally closed contacts are opened. At this time, the frequency converter 10 is controlled to work, and the motor runs in a charged mode. After the motor to be measured 30 runs for 30 minutes, the resistance of the motor and the ambient temperature when the motor runs are required to be measured, at this time, the controller 70 can control the coil to be powered off, the electromagnetic attraction force disappears, the armature is released under the action of the release spring, the contact is restored, the normally open contact is disconnected, and the normally closed contact is closed.
In one embodiment, the switching module 60 includes: the device comprises a first connecting module 61 and a second connecting module 62, wherein one end of the first connecting module 61 is connected with the output end of the frequency converter 10, and the other end of the first connecting module 61 is used for connecting a motor 30 to be tested; one end of the second connection module 62 is connected to the resistance measurement module 40, and the other end of the second connection module 62 is used for connecting the motor 30 to be measured.
The first connection module 61 is a module capable of opening or disconnecting a connection line, and is not limited to a module with only one connection point, for example, the first connection module may be a three-way switch, and the three-way switch of the switch module is respectively connected to three corresponding output ends of the frequency converter 10 and a three-phase contact of the motor 30 to be tested. The second connection module 62 is identical to the first connection module 61. Therefore, one end of the first connection module 61 does not necessarily have only one connection point, and may have a plurality of connection points.
In one embodiment, the resistance measurement module 40 includes: and one end of the resistance meter is connected with the motor 30 to be tested through the second connecting module 62, and the other end of the resistance meter is connected with the controller 70. The resistance meter refers to an instrument for measuring resistance, such as a HIOKI 3541 resistance meter, which is arranged on the same day, and the specific connection relationship between the resistance meter and the second connection module 62 and the controller 70 can be adjusted adaptively according to the specific resistance meter type. For example, in one embodiment, as shown in fig. 1, two connection points of the resistance meter are respectively connected to one end of two normally closed contacts in the second connection module 62, and the other ends of the two normally closed contacts are correspondingly connected to either end of any two-phase winding of the motor, so as to measure the motor resistance.
In one embodiment, the temperature measurement module 50 includes: and the thermocouple measuring instrument is connected with the controller 70 and is used for measuring the ambient temperature of the motor 30 to be measured. The thermocouple meters may be distributed about the motor 30 under test. The temperature measurement module 50 may include a short-circuit protection circuit or the like in addition to the thermocouple measurement instrument for protecting the instrument from damage.
In one embodiment, the motor temperature rise testing device further comprises: and a data connection module, wherein the controller 70 is electrically connected with the resistance measurement module 40 and the temperature measurement module 50 through the data connection module respectively. In addition, the controller 70 can also be connected to the frequency converter 10 via the data connection module. The data connection module may include a plurality of RS485 data connection lines for respectively connecting the controller 70, the resistance measurement module 40, the temperature measurement module 50, and the frequency converter 10.
In one embodiment, the controller 70 is configured to periodically control the switching module 60 to switch between the first state and the second state. In order to obtain a better temperature rise curve, in the first state, after the initial temperature and resistance of the motor 30 to be measured are measured, the switching module 60 can be controlled to be in the second state, after the motor runs for 30 minutes, the motor is switched to be in the first state, and the ambient temperature and the motor resistance after the motor runs are measured; then, controlling and switching to a second state, operating for 30 minutes, switching to the first state, and measuring the ambient temperature and the motor resistance after the second operation is finished; the state of the switching module 60 is switched periodically in this way, and the measurement of the ambient temperature and the motor resistance of the motor running time of 30 minutes, 60 minutes, 90 minutes and the like can be completed by matching with the control of the frequency converter 10, and a temperature rise curve (as shown in fig. 2) can be drawn according to the data, so that the problem of measurement accuracy reduction caused by the influence of other factors on the data at a certain sampling moment is avoided, and the motor temperature rise measurement accuracy is improved.
In one embodiment, the motor temperature rise testing device further comprises: and the rotating speed measuring instrument is electrically connected with the controller 70 and is used for measuring the rotating speed of the motor 30 to be measured and feeding the rotating speed back to the controller 70. In order to avoid the resistance measuring module 40 from collecting the motor resistance when the motor does not stop, the controller 70 obtains an output signal of the rotation speed measuring instrument, the output signal is used for representing the rotation speed of the motor, and when the motor is judged to stop according to the signal, the controller 70 controls the connection path between the resistance measuring module 40 in the switching module 60 and the motor 30 to be measured to be open, so that the uncharged automatic measurement of the motor resistance is realized. In addition, the mode can also ensure that each measurement of the resistance measurement module 40 is effective, save the electric energy of the resistance measurement module 40 and protect the environment. Similarly, the controller 70 may also refer to controlling the temperature measurement module 50 to measure the ambient temperature while the resistance measurement module 40 measures the resistance. In addition, the controller 70 may also monitor the motor speed by collecting the output current of the frequency converter 10.
Of course, the controller 70 may determine whether the motor stalls according to the time of disconnecting the connection path between the frequency converter 10 and the motor 30 to be measured in the switching module 60, for example, if the motor stalls generally for 15S, it may determine that the connection path between the frequency converter 10 and the motor 30 to be measured is disconnected for 15S, and then control the resistance measurement module 40 to perform data measurement.
The embodiment of the present application further provides a motor temperature rise test control method applied to the above motor temperature rise test apparatus, as shown in fig. 3, including:
s10: controlling the switching module to be in a first state and controlling the frequency converter to stop working; in the first state, the switching module disconnects the frequency converter from the motor to be tested and connects the resistance measuring module with the motor to be tested;
s20: acquiring motor resistance when a motor to be detected stops rotating and the environmental temperature of the motor to be detected in a first state;
s30: if the test ending condition is not met, controlling the switching module to switch to the second state and controlling the frequency converter to work; in the second state, the switching module is communicated with the frequency converter and the motor to be tested, and the connection between the resistance measuring module and the motor to be tested is disconnected;
s40: after the switching module is switched to the second state and reaches the preset running time, skipping to execute the step that the control switching module is in the first state and the frequency converter is controlled to stop working;
s90: and if the test end condition is met, obtaining the temperature rise of the motor to be tested according to the motor resistance and the environment temperature of the motor to be tested when the motor to be tested is not started, and the motor resistance and the environment temperature of the motor to be tested after the motor to be tested is operated at each time.
The explanations of the terms of the first state, the frequency converter, etc. are the same as those described in the above embodiments of the motor temperature rise testing apparatus, and are not described herein again. The preset running time may be set in advance and stored in the execution main body.
In order to better explain the implementation process of the motor temperature rise test control method provided by the present application, a specific application structure in fig. 1 is taken as an example for explanation, but the explanation does not affect the application range of the control method. After the test is started, the controller controls the frequency converter to stop, as shown in fig. 1, the KM1 in the switching module is disconnected, the rotating speed of the motor is judged to be zero, the KM2 in the switching module is closed, the resistance temperature measuring module measures the resistance R0 of the motor to be tested when the temperature rise test is started, and the temperature measuring module measures the ambient temperature T0. After R0 and T0 are measured, the controller controls the KM2 to be switched off and the KM1 to be switched on, and instructs the frequency converter to start the motor to operate according to a set load. After 30 minutes of operation, step S10 and step S20 are actually performed for about 15S. And then, when the rotating speed of the motor is zero, measuring the thermal state winding resistance Rn and the environment temperature Tn after the motor operation is finished. And calculating the temperature rise of the 1 st test point according to R0, T0, rn and Tn. The control method can realize the same beneficial effect as the motor temperature rise testing device in the executed process.
In one embodiment, the test end condition is that the motor under test reaches thermal stability. Thermal stability refers to the balance of heat generated by the motor and heat dissipation. For example, a temperature rise that can vary by less than 1K between two successive readings over 30 minutes is considered to be thermostable. To measure more point temperature rise, the sequential data can be measured every 30 minutes before the motor reaches thermal stability for the controller to process and generate a temperature rise characteristic curve. Namely, before the motor to be measured does not reach thermal stability, the steps S10 to S40 are periodically executed, if the motor runs for 8H and can reach thermal stability, the motor can run for 8H, the steps S10 to S40 are periodically executed in 8H, the controller processes the temperature and resistance data acquired each time, the temperature rise of each point is obtained, and a temperature rise characteristic curve is generated (as shown in fig. 2).
In one embodiment, the preset run time is 30 minutes.
It should be understood that, although the steps in the flowchart of fig. 3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 3 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
In one embodiment, as shown in fig. 4, there is provided a motor temperature rise test control device, including:
the first control unit 100 is configured to control the switching module to be in a first state and control the frequency converter to stop working; in the first state, the switching module disconnects the frequency converter from the motor to be tested and connects the resistance measuring module with the motor to be tested;
the measuring unit 200 is configured to obtain a motor resistance when the motor to be measured stops rotating and an ambient temperature of the motor to be measured in the first state;
the second control unit 300 is configured to control the switching module to switch to the second state and control the frequency converter to operate when the test termination condition is not satisfied; in the second state, the switching module is communicated with the frequency converter and the motor to be tested, and the connection between the resistance measuring module and the motor to be tested is disconnected;
a third control unit 400, configured to jump to execute the step of controlling the switching module to be in the first state and controlling the frequency converter to stop working after the switching module is switched to the second state and reaches a preset operation time;
and the calculating unit 900 is configured to obtain the temperature rise of the motor to be tested according to the motor resistance and the environmental temperature of the motor to be tested when the motor to be tested is not started, and the motor resistance and the environmental temperature of the motor to be tested after the motor to be tested runs each time when the testing end condition is met.
For the specific definition of the motor temperature rise test control device, reference may be made to the above definition of the motor temperature rise test control method, which is not described herein again. Specifically, the first control unit 100 is used to control the switching module to be in the first state and control the frequency converter to stop working; then, the resistance and the ambient temperature of the motor to be measured in the first state when the motor to be measured stops rotating are obtained through the measuring unit 200; then, when the second control unit 300 does not meet the test end condition, the switching module is controlled to switch to the second state, and the frequency converter is controlled to work; then, after the switching module is switched to the second state and reaches the preset operation time, the third control unit 400 skips to execute the step of controlling the switching module to be in the first state and controlling the frequency converter to stop working; then, continuously acquiring the resistance and the ambient temperature of the motor to be measured in the first state when the motor to be measured stops rotating through the measuring unit 200; and finally, when the calculation unit 900 meets the test end condition, calculating to obtain the temperature rise of the motor to be tested according to the motor resistance and the environment temperature when the motor to be tested is not started, and the motor resistance and the environment temperature after the motor to be tested finishes running each time.
All modules in the motor temperature rise test control device can be completely or partially realized through software, hardware and a combination of the software and the hardware. The modules can be embedded in a hardware form or independent from a processor in the controller, and can also be stored in a memory in the controller in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
In one embodiment, a controller is provided, which may be a server, and its internal structure diagram may be as shown in fig. 5. The controller includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the controller is configured to provide computational and control capabilities. The memory of the controller comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the controller is used for storing data such as preset running time, total measuring time and the like. The network interface of the controller is used for communicating with an external terminal through network connection. The computer program is executed by a processor to implement a method of controlling movement of a screed.
Those skilled in the art will appreciate that the configuration shown in fig. 5 is a block diagram of only a portion of the configuration associated with the present application and does not constitute a limitation on the controller to which the present application is applied, and that a particular controller may include more or fewer components than those shown, or combine certain components, or have a different arrangement of components.
In one embodiment, a controller is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
s10: controlling the switching module to be in a first state and controlling the frequency converter to stop working; in the first state, the switching module disconnects the frequency converter from the motor to be tested and connects the resistance measuring module with the motor to be tested;
s20: acquiring motor resistance when a motor to be detected stops rotating and the environmental temperature of the motor to be detected in a first state;
s30: if the test ending condition is not met, controlling the switching module to switch to the second state and controlling the frequency converter to work; in the second state, the switching module is communicated with the frequency converter and the motor to be tested, and the connection between the resistance measuring module and the motor to be tested is disconnected;
s40: after the switching module is switched to the second state and reaches the preset running time, skipping to execute the step that the control switching module is in the first state and the frequency converter is controlled to stop working;
s90: and if the test end condition is met, obtaining the temperature rise of the motor to be tested according to the motor resistance and the environment temperature when the motor to be tested is not started, and the motor resistance and the environment temperature after the motor to be tested finishes running each time.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
s10: controlling the switching module to be in a first state and controlling the frequency converter to stop working; in the first state, the switching module disconnects the frequency converter from the motor to be tested and connects the resistance measuring module with the motor to be tested;
s20: acquiring motor resistance when a motor to be tested stops rotating and the environmental temperature of the motor to be tested in a first state;
s30: if the test ending condition is not met, controlling the switching module to switch to the second state and controlling the frequency converter to work; in the second state, the switching module is communicated with the frequency converter and the motor to be tested, and the connection between the resistance measuring module and the motor to be tested is disconnected;
s40: after the switching module is switched to the second state and reaches the preset running time, skipping to execute the step that the control switching module is in the first state and the frequency converter is controlled to stop working;
s90: and if the test end condition is met, obtaining the temperature rise of the motor to be tested according to the motor resistance and the environment temperature of the motor to be tested when the motor to be tested is not started, and the motor resistance and the environment temperature of the motor to be tested after the motor to be tested is operated at each time.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), for example.
In the description herein, reference to the term "in one embodiment," "wherein," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic depictions of the above terms do not necessarily refer to the same embodiment or example.
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.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a motor temperature rise testing arrangement which characterized in that includes:
the input end of the frequency converter is used for being connected with a power supply, and the output end of the frequency converter is used for being connected with a motor to be tested;
the resistance measuring module is used for measuring the motor resistance when the motor to be measured is not started and the motor resistance after the operation is finished each time;
the temperature measuring module is used for measuring the ambient temperature of the motor to be measured;
the first connecting end of the switching module is connected with the output end of the frequency converter, the second connecting end of the switching module is connected with the measuring end of the resistance measuring instrument, and the third connecting end of the switching module is used for connecting the motor to be measured;
the controller is respectively electrically connected with the control end of the frequency converter, the output end of the resistance measuring module, the output end of the temperature measuring module and the control end of the switching module, and is used for periodically controlling the switching module to switch between a first state and a second state, and the controller is used for controlling the frequency converter to stop working and judging whether the rotating speed of the motor to be measured is zero or not when the switching module is in the first state; the switching module is also used for controlling the frequency converter to work when the switching module is in a second state; the controller is further used for obtaining the temperature rise of the motor to be tested according to the motor resistance and the environment temperature of the motor to be tested when the motor to be tested is not started and the motor resistance and the environment temperature of the motor to be tested after the motor to be tested finishes running each time when the motor to be tested is thermally stable, and generating a temperature rise characteristic curve according to the temperature rise of the motor to be tested;
wherein the controlling the switching module to switch between the first state and the second state comprises: acquiring the motor resistance when the motor to be tested stops running and the environment temperature of the motor to be tested in the first state; if the motor to be tested does not reach thermal stability, controlling the switching module to switch from the first state to the second state, and after the switching module is switched to the second state and reaches preset operation time, controlling the switching module to switch to the first state until the motor to be tested reaches thermal stability; the motor to be tested reaches thermal stability, and the difference value between the temperature rises of the motor to be tested is smaller than a preset value;
in the first state, the switching module disconnects the frequency converter from the motor to be tested and connects the resistance measuring module with the motor to be tested; and in the second state, the switching module is communicated with the frequency converter and the motor to be tested, and is disconnected with the resistance measuring module and the motor to be tested.
2. The motor temperature rise testing device of claim 1, wherein the switching module comprises:
one end of the first connecting module is connected with the output end of the frequency converter, and the other end of the first connecting module is used for connecting the motor to be tested;
and one end of the second connecting module is connected with the resistance measuring module, and the other end of the second connecting module is used for connecting the motor to be measured.
3. The motor temperature rise test device of claim 2, wherein the resistance measurement module comprises:
and one end of the resistance meter is connected with the motor to be tested through the second connecting module, and the other end of the resistance meter is connected with the controller.
4. The motor temperature rise test device according to any one of claims 1 to 3, wherein the temperature measurement module comprises:
and the thermocouple measuring instrument is connected with the controller and is used for measuring the ambient temperature of the motor to be measured.
5. The motor temperature rise test device of claim 1, further comprising:
and the controller is electrically connected with the resistance measuring module and the temperature measuring module respectively through the data connecting module.
6. The motor temperature rise testing device of claim 1, further comprising:
and the rotating speed measuring instrument is electrically connected with the controller and is used for measuring the rotating speed of the motor to be measured and feeding back the rotating speed to the controller.
7. A motor temperature rise test control method applied to the motor temperature rise test device of claim 1, characterized by comprising:
controlling the switching module to be in a first state and controlling the frequency converter to stop working; in the first state, the switching module disconnects the frequency converter from the motor to be tested and connects the resistance measuring module with the motor to be tested;
acquiring the motor resistance when the motor to be tested stops running and the environment temperature of the motor to be tested in the first state;
if the test finishing condition is not met, controlling the switching module to switch to a second state and controlling the frequency converter to work; in the second state, the switching module is communicated with the frequency converter and the motor to be tested, and the connection between the resistance measuring module and the motor to be tested is disconnected;
after the switching module is switched to the second state and reaches the preset running time, skipping to execute the step of controlling the switching module to be in the first state and controlling the frequency converter to stop working;
and if the test end condition is met, obtaining the temperature rise of the motor to be tested according to the motor resistance and the environment temperature when the motor to be tested is not started and the motor resistance and the environment temperature after the motor to be tested finishes running each time.
8. The motor temperature rise test control method according to claim 7, wherein the test end condition is that the motor to be tested reaches thermal stability.
9. A motor temperature rise test control device, which is applied to the motor temperature rise test device in claim 1, and is characterized in that the device comprises:
the first control unit is used for controlling the switching module to be in a first state and controlling the frequency converter to stop working; in the first state, the switching module disconnects the frequency converter from the motor to be tested and connects the resistance measuring module with the motor to be tested;
the measuring unit is used for acquiring the motor resistance when the motor to be measured stops rotating and the environment temperature of the motor to be measured in the first state;
the second control unit is used for controlling the switching module to switch to a second state and controlling the frequency converter to work when the test finishing condition is not met; in the second state, the switching module is communicated with the frequency converter and the motor to be tested, and the connection between the resistance measuring module and the motor to be tested is disconnected;
the third control unit is used for skipping to execute the step that the switching module is controlled to be in the first state and the frequency converter is controlled to stop working after the switching module is switched to the second state and reaches the preset running time;
and the calculating unit is used for obtaining the temperature rise of the motor to be tested according to the motor resistance and the environment temperature of the motor to be tested when the motor to be tested is not started and the motor resistance and the environment temperature of the motor to be tested after the motor to be tested runs each time when the testing end condition is met.
10. A controller comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 7 to 8.
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