CN113030730B - Detection system and detection method for oil-cooled permanent magnet motor - Google Patents
Detection system and detection method for oil-cooled permanent magnet motor Download PDFInfo
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- CN113030730B CN113030730B CN202110543125.9A CN202110543125A CN113030730B CN 113030730 B CN113030730 B CN 113030730B CN 202110543125 A CN202110543125 A CN 202110543125A CN 113030730 B CN113030730 B CN 113030730B
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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Abstract
The invention discloses a detection system and a detection method of an oil-cooled permanent magnet motor, wherein the detection method mainly comprises the following steps: the method comprises the following steps that a controller and a detection mechanism acquire design parameters of the air compressor; starting the air compressor, and controlling the air compressor to test by adopting three different modes and preset running time respectively, wherein the input frequency of the oil-cooled permanent magnet motor and the air supply pressure of the air compressor are limited in each mode; the controller detects the energy efficiency of the air compressor; the detection mechanism can judge whether the torque of the air compressor is qualified or not according to the detection data recorded when the three modes are executed and the detection data recorded when the step S500 is executed; the application discloses detection method of oil-cooled permanent magnet motor can detect the moment of air compressor to improve the quality of the air compressor that the producer produced, thereby improve user's use and experience.
Description
Technical Field
The invention relates to the technical field of motor system detection, in particular to a detection system and a detection method of an oil-cooled permanent magnet motor.
Background
At present, an oil-cooled permanent magnet synchronous motor is widely applied to an integrated permanent magnet variable frequency screw air compressor, and the operation of the air compressor of the type is controlled by referring to JB/T13345-2017; in terms of testing on oil-cooled permanent magnet synchronous motors, there are the following problems:
in the JB/T13345-2017 integrated permanent magnet variable frequency screw air compressor, requirements on torque and energy efficiency of an oil-cooled permanent magnet synchronous motor and a corresponding test method are not provided.
If the oil-cooled permanent magnet synchronous motor cannot provide enough torque, the risk of shortening the service life of the oil-cooled permanent magnet synchronous motor or burning out the oil-cooled permanent magnet synchronous motor occurs; in addition, the torque of the oil-cooled permanent magnet synchronous motor is influenced by the temperature of the compressor, namely the torque of the oil-cooled permanent magnet synchronous motor changes in the working process of the compressor; therefore, it is necessary to detect the torque of the oil-cooled permanent magnet synchronous motor to ensure that the oil-cooled permanent magnet synchronous motor provides sufficient torque.
Generally, a torque test system consisting of a torque sensor, a rotating speed sensor, a generator and the like is required to be used for detecting the torque and the energy efficiency of the motor, but a common manufacturer cannot detect the torque of the compressor by using the torque test system because the torque test system is low in use frequency and high in cost.
Along with the attention of a user to the energy efficiency of the compressor, if the compressor with insufficient torque and poor energy efficiency is provided to a client, the use experience of the client can be greatly reduced.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a detection method of an oil-cooled permanent magnet motor, which can detect the torque of an air compressor so as to improve the quality of the air compressor produced by a manufacturer and improve the use experience of a user.
In order to achieve the purpose, the invention adopts the following technical scheme:
the detection method of the oil-cooled permanent magnet motor comprises an air compressor and a detection mechanism, wherein the air compressor comprises a controller, and a compressor main machine, an oil-cooled permanent magnet motor, a fan and a frequency converter which are respectively and electrically connected with the controller; the detection method comprises the following steps:
s100, a controller and a detection mechanism acquire design parameters of an air compressor, wherein the design parameters comprise a rated frequency A of an oil-cooled permanent magnet motor, a rated pressure B of the air compressor, a rated power E of the oil-cooled permanent magnet motor, a maximum long-time allowable current F of a frequency converter and a maximum allowable long-time operation current H of the oil-cooled permanent magnet motor;
s200, starting an air compressor, controlling the input frequency of an oil-cooled permanent magnet motor to be equal to A by a controller, and controlling the air supply pressure of the air compressor to be equal to 1.1 multiplied by B; the detection mechanism acquires and records the input current of the oil-cooled permanent magnet motor, the input frequency of the oil-cooled permanent magnet motor and the exhaust pressure of the air compressor; when the running time of the air compressor is more than or equal to the running time preset in the controller, the controller controls the compressor to stop running;
s300, starting an air compressor, and controlling the input frequency of an oil-cooled permanent magnet motor to be equal to 0.7 xA and the air supply pressure of the air compressor to be equal to 1.1 xB by a controller; the detection mechanism acquires and records the input current of the oil-cooled permanent magnet motor, the input frequency of the oil-cooled permanent magnet motor and the exhaust pressure of the air compressor; when the running time of the air compressor is greater than or equal to the preset running time, the controller controls the compressor to stop running;
s400, starting the air compressor, adjusting the input frequency of the oil-cooled permanent magnet motor by the controller according to the rated power E of the oil-cooled permanent magnet motor, and controlling the air supply pressure of the air compressor to be equal to 1.1 multiplied by B; the detection mechanism acquires and records the input current of the oil-cooled permanent magnet motor, the input frequency of the oil-cooled permanent magnet motor and the exhaust pressure of the air compressor; when the running time of the air compressor is greater than or equal to the preset running time, the controller controls the compressor to stop running;
s500, testing the energy efficiency of the air compressor by the controller according to a volumetric compressor flow testing method, and feeding the tested energy efficiency back to a detection mechanism; the detection mechanism acquires and records the input current of the oil-cooled permanent magnet motor in the detection process;
s600, the detection mechanism judges whether the torque of the air compressor is qualified or not or judges whether the energy efficiency of the air compressor is qualified or not according to the detection data recorded in the steps S200, S300, S400 and S500.
In the method for detecting an oil-cooled permanent magnet motor, in the step S600, the detection mechanism determines whether the torque is qualified according to the detection data recorded by the detection mechanism in the steps S200, S300, S400, and S500, and specifically includes the steps of:
and S610, if the input current of the oil-cooled permanent magnet motor recorded by the detection mechanism in the steps S200, S300 and S400 is smaller than the maximum long-time allowable current F of the frequency converter and smaller than the maximum allowable long-time operation current H of the oil-cooled permanent magnet motor in the detection process, and the input current of the oil-cooled permanent magnet motor recorded by the detection mechanism in the step S500 is smaller than H, outputting a detection result with qualified torque by the detection mechanism.
In the method for detecting an oil-cooled permanent magnet motor, in the step S600, the detection mechanism determines whether the energy efficiency is qualified according to the detection data recorded by the detection mechanism in the steps S200, S300, S400, and S500, and specifically includes the steps of:
s621, a detection mechanism obtains energy efficiency of a reference air compressor measured by adopting a volumetric compressor flow testing method;
s622, if the energy efficiency measured in the step S500 is better than or equal to the energy efficiency measured in the step S621, the detection mechanism outputs a detection result that the energy efficiency is qualified; otherwise, the detection mechanism outputs a detection result with unqualified energy efficiency.
In the method for detecting the oil-cooled permanent magnet motor, the controller adjusts the input frequency of the oil-cooled permanent magnet motor according to the rated power E of the oil-cooled permanent magnet motor, and the method specifically comprises the following steps:
when E is less than or equal to 55 kilowatts, the controller controls the input frequency of the oil-cooled permanent magnet motor to be equal to 0.3 xA;
when E is more than 55 kilowatt, the controller controls the input frequency of the oil-cooled permanent magnet motor to be equal to 0.4 xA.
In the detection method of the oil-cooled permanent magnet motor, the design parameters further comprise an engine oil alarm temperature C; the step S200 further includes the steps of:
s210, acquiring the engine oil temperature of the oil-cooled permanent magnet motor by a controller;
s211, if the temperature of the engine oil is more than or equal to C +5, controlling the fan to start by the controller;
and S212, if the engine oil temperature is less than or equal to C, controlling the fan to stop working by the controller.
In the detection method of the oil-cooled permanent magnet motor, the design parameters further comprise an alarm temperature D of an oil-cooled permanent magnet motor coil; the step S200 further includes the steps of:
s220, acquiring the real-time coil temperature of the oil-cooled permanent magnet motor by a detection mechanism;
and S221, if the real-time coil temperature is larger than or equal to D, outputting a control instruction for stopping the test to the controller by the detection mechanism.
In the method for detecting an oil-cooled permanent magnet motor, the step S300 further includes the steps of:
s310, acquiring the engine oil temperature of the oil-cooled permanent magnet motor by a controller;
s311, if the temperature of the engine oil is more than or equal to C +5, controlling the fan to start by the controller;
s312, if the temperature of the engine oil is less than or equal to C, controlling the fan to stop working by the controller;
s320, acquiring the real-time coil temperature of the oil-cooled permanent magnet motor by a detection mechanism;
s321, if the real-time coil temperature is larger than or equal to D, the detection mechanism outputs a control instruction for stopping the test to the controller.
In the method for detecting an oil-cooled permanent magnet motor, the step S400 further includes the steps of:
s410, acquiring the engine oil temperature of the oil-cooled permanent magnet motor by a controller;
s411, if the temperature of the engine oil is more than or equal to C +5, controlling the fan to start by the controller;
s412, if the engine oil temperature is less than or equal to C, controlling the fan to stop working by the controller;
s420, acquiring the real-time coil temperature of the oil-cooled permanent magnet motor by a detection mechanism;
and S421, if the real-time coil temperature is greater than or equal to D, the detection mechanism outputs a control instruction for stopping the test to the controller.
The invention also correspondingly provides a detection system of the oil-cooled permanent magnet motor, and the detection system adopts any one of the detection methods of the oil-cooled permanent magnet motor to realize work control; the detection system comprises a detection mechanism and an air compressor; the air compressor comprises a controller, and a frequency converter, an oil-cooled permanent magnet motor, a compressor main machine and a fan which are respectively and electrically connected with the controller; the frequency converter is used for driving the oil-cooled permanent magnet motor, the oil-cooled permanent magnet motor is used for driving the compressor main machine, and the fan is used for cooling the engine oil output by the compressor main machine; the detection mechanism is electrically connected with the controller, the oil-cooled permanent magnet motor and the compressor host respectively; the detection mechanism is used for acquiring the input current of the oil-cooled permanent magnet motor, the input frequency of the oil-cooled permanent magnet motor and the exhaust pressure of the air compressor and detecting the engine oil temperature and the coil temperature of the oil-cooled permanent magnet motor.
In the detection system of the oil-cooled permanent magnet motor, the controller comprises a first communication unit, and the detection mechanism comprises a control unit, a storage unit, a second communication unit and a temperature detection part which are respectively and electrically connected with the control unit; the storage unit stores a control program; the second communication unit is in wireless communication connection with the first communication unit; the temperature detection part is used for detecting the temperature of the engine oil and the temperature of a coil of the oil-cooled permanent magnet motor.
Has the advantages that:
the invention provides a detection method of an oil-cooled permanent magnet motor.A controller respectively adopts three different modes and controls an air compressor for testing according to preset running time, and each mode limits the input frequency of the oil-cooled permanent magnet motor and the air supply pressure of the air compressor; the controller detects the energy efficiency of the air compressor; the detection mechanism can judge whether the torque of the air compressor is qualified according to the detection data recorded in the three modes and the detection data recorded when the step S500 is executed, so that the detection of the torque of the air compressor can be realized, the quality of the produced air compressor can be improved, and the use experience of a user is improved.
Drawings
FIG. 1 is a first logic flow diagram of a detection method provided by the present invention;
FIG. 2 is a logic flow diagram of one embodiment of step S600 of a detection method provided by the present invention;
FIG. 3 is a logic flow diagram of one embodiment of step S200 provided by the present invention;
FIG. 4 is a logic flow diagram of one embodiment of step S300 provided by the present invention;
FIG. 5 is a logic flow diagram for one embodiment of step S400 provided by the present invention;
fig. 6 is a system configuration diagram of the detection system provided by the present invention.
Description of the main element symbols: 1-air compressor, 11-controller, 111-first communication unit, 12-frequency converter, 13-oil cooling permanent magnet motor, 14-compressor host, 15-blower, 2-detection mechanism, 21-control unit, 22-second communication unit, 23-storage unit, 24-temperature detection portion and 25-electric power analyzer.
Detailed Description
The invention provides a detection system and a detection method of an oil-cooled permanent magnet motor, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail by referring to the attached drawings and embodiments.
In the description of the present invention, it is to be understood that the terms "mounted," "connected," and the like are to be interpreted broadly, and those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
Referring to fig. 1, the present invention provides a detection method for an oil-cooled permanent magnet motor, where the detection system includes an air compressor 1 and a detection mechanism 2, the air compressor 1 includes a controller 11, and a compressor main unit 14, an oil-cooled permanent magnet motor 13, a fan 15, and a frequency converter 12 that are electrically connected to the controller 11, respectively, and the detection mechanism 2 is electrically connected to the controller 11, the compressor main unit 14, and the oil-cooled permanent magnet motor 13, respectively; the detection method comprises the following steps:
s100, the controller 11 and the detection mechanism 2 acquire design parameters of the air compressor 1, wherein the design parameters comprise a rated frequency A of the oil-cooled permanent magnet motor 13, a rated pressure B of the air compressor 1, a rated power E of the oil-cooled permanent magnet motor 13, a maximum long-time allowable current F of the frequency converter 12 and a maximum allowable long-time operation current H of the oil-cooled permanent magnet motor 13; the unit of the rated power A of the oil-cooled permanent magnet motor 13 is Hz, the unit of the rated pressure B of the air compressor 1 is Mpa, the unit of the rated power E of the oil-cooled permanent magnet motor 13 is Kw, the unit of the maximum long-time running current F of the frequency converter 12 is A, and the unit of the maximum allowable long-time running current H of the oil-cooled permanent magnet motor 13 is A.
The numerical value a and the numerical value E can be obtained by referring to the design drawing of the oil-cooled permanent magnet motor 13, and can be stored in the controller 11 and the detection mechanism 2 in advance after being referred by a worker; the rated pressure B of the air compressor 1 refers to the maximum working pressure of the air compressor 1 which can run for a long time, namely, a value B is preset in the controller 11 and the detection mechanism 2 through empirical calculation by workers; the numerical value F and the numerical value H can be preset in the controller 11 and the detection mechanism 2 by workers according to the use place of the air compressor 1; setting the maximum long-time allowable current F of the frequency converter 12 for protecting the frequency converter 12 and avoiding the problem of failure of the frequency converter 12; the maximum allowable long-time running current H of the oil-cooled permanent magnet motor 13 is set for protecting the oil-cooled permanent magnet motor 13, and the phenomenon that the oil-cooled permanent magnet motor 13 is over-high in temperature and demagnetized or even burnt is avoided.
S200, starting the air compressor 1, and controlling the input frequency of the oil-cooled permanent magnet motor 13 to be equal to A and the air supply pressure of the air compressor 1 to be equal to 1.1 multiplied by B by the controller 11; the controller 11 can acquire the input frequency of the oil-cooled permanent magnet motor 13 and the air supply pressure of the air compressor 1 in real time, and adjust the working states of the oil-cooled permanent magnet motor 13 and the air compressor 1, so that the input frequency of the oil-cooled permanent magnet motor 13 and the air supply pressure of the air compressor 1 are kept stable; the detection mechanism 2 acquires and records the input current of the oil-cooled permanent magnet motor 13, the input frequency of the oil-cooled permanent magnet motor 13 and the exhaust pressure of the air compressor 1, and the detection mechanism 2 can acquire the three data every 30 seconds and store the acquired data every time; when the running time of the air compressor 1 is more than or equal to the running time preset in the controller 11, the controller 11 controls the air compressor 1 to stop running; in one embodiment, the run time period is 2 hours, i.e., the air compressor 1 is maintained in a two hour run state to complete the test.
S300, starting the air compressor 1, and controlling the input frequency of the oil-cooled permanent magnet motor 13 to be equal to 0.7 × A and the air supply pressure of the air compressor 1 to be equal to 1.1 × B by the controller 11; the controller 11 can acquire the input frequency of the oil-cooled permanent magnet motor 13 and the air supply pressure of the air compressor 1 in real time, and adjust the working states of the oil-cooled permanent magnet motor 13 and the air compressor 1, so that the input frequency of the oil-cooled permanent magnet motor 13 and the air supply pressure of the air compressor 1 are kept stable; the detection mechanism 2 acquires and records the input current of the oil-cooled permanent magnet motor 13, the input frequency of the oil-cooled permanent magnet motor 13 and the exhaust pressure of the air compressor 1, and the detection mechanism 2 can acquire the three data at intervals of 30S and store the acquired data each time; when the running time of the air compressor 1 is greater than or equal to the preset running time, the controller 11 controls the compressor to stop running; in one embodiment, the run length is 2 hours.
S400, starting the air compressor 1, adjusting the input frequency of the oil-cooled permanent magnet motor 13 by the controller 11 according to the rated power E of the oil-cooled permanent magnet motor 13, and controlling the air supply pressure of the air compressor 1 to be equal to 1.1 multiplied by B; the controller 11 can acquire the input frequency of the oil-cooled permanent magnet motor 13 and the air supply pressure of the air compressor 1 in real time, and adjust the working states of the oil-cooled permanent magnet motor 13 and the air compressor 1, so that the input frequency of the oil-cooled permanent magnet motor 13 and the air supply pressure of the air compressor 1 are kept stable; the detection mechanism 2 acquires and records the input current of the oil-cooled permanent magnet motor 13, the input frequency of the oil-cooled permanent magnet motor 13 and the exhaust pressure of the air compressor 1, and the detection mechanism 2 can acquire the three data every 30 seconds and store the acquired data every time; when the running time of the air compressor 1 is greater than or equal to the preset running time, the controller 11 controls the compressor to stop running; in one embodiment, the operating time period is 2 hours, i.e., the operating time periods of the three test modes are consistent.
S500, the controller 11 tests the energy efficiency of the air compressor 1 according to the volumetric compressor flow testing method and feeds the tested energy efficiency back to the detection mechanism 2; the detection mechanism 2 acquires and records the input current of the oil-cooled permanent magnet motor 13 in the detection process; in one embodiment, the controller tests the energy efficiency of the air compressor 1 according to the GB/T15487-2015 volumetric compressor flow test method.
S600, the detection mechanism judges whether the torque of the air compressor is qualified or not or judges whether the energy efficiency of the air compressor is qualified or not according to the detection data recorded in the steps S200, S300, S400 and S500.
According to the detection method of the oil-cooled permanent magnet motor, the controller 11 controls the air compressor 1 to test in three different modes according to the preset running time, and each mode limits the input frequency of the oil-cooled permanent magnet motor 13 and the air supply pressure of the air compressor 1; the controller 11 detects the energy efficiency of the air compressor 1 again; the detection mechanism 2 can judge whether the moment of the air compressor 1 is qualified or not according to the detection data recorded in the three modes and the detection data recorded when the step S500 is executed, so that the moment of the air compressor 1 can be detected, the quality of the produced air compressor 1 is improved, and the use experience of a user is improved; the detection is carried out without using sensors with higher price such as a torque sensor and a rotating speed sensor, so that the detection cost is reduced; in addition, whether the energy efficiency of the air compressor is qualified or not can be detected, and the applicability of the detection method of the oil-cooled permanent magnet motor is improved.
Further, referring to fig. 2, in step S600, the detecting mechanism determines whether the torque is qualified according to the detection data recorded by the detecting mechanism in step S200, step S300, step S400, and step S500, and specifically includes the steps of:
s610, if the input current of the oil-cooled permanent magnet motor 13 recorded by the detection mechanism 2 in the steps S200, S300, and S400 is smaller than the maximum long-time allowable current F of the frequency converter 12 and smaller than the maximum allowable long-time operating current H of the oil-cooled permanent magnet motor 13 in the detection process, and the input current of the oil-cooled permanent magnet motor 13 recorded by the detection mechanism 2 in the step S500 is smaller than H, the detection mechanism 2 outputs a detection result that the torque is qualified; that is, when the three conditions are satisfied simultaneously, the detection mechanism 2 outputs the detection result that the torque is qualified, otherwise, as long as any one of the conditions is not satisfied, the detection mechanism 2 outputs the detection result that the torque is unqualified.
Further, referring to fig. 2, in step S600, the detecting unit determines whether the energy efficiency is qualified according to the detection data recorded by the detecting unit in step S200, step S300, step S400, and step S500, and specifically includes the steps of:
s621, the detection mechanism 2 obtains the energy efficiency of the reference air compressor measured by adopting a volumetric compressor flow testing method; the reference air compressor is an air compressor which passes the torque and energy efficiency tests; in one embodiment, the energy efficiency of the reference air compressor is measured by GB/T15487-2015 volumetric compressor flow test method.
In other embodiments, the detected oil-cooled permanent magnet motor 13 may be directly replaced with a reference oil-cooled permanent magnet motor, that is, only the oil-cooled permanent magnet motor 13 is replaced without changing other components inside the air compressor, and then the energy efficiency of the air compressor 1 replacing the oil-cooled permanent magnet motor 13 is tested by using a GB/T15487-2015 volumetric compressor flow testing method, so as to obtain the energy efficiency for reference.
S622, if the energy efficiency measured in the step S500 is better than or equal to the energy efficiency measured in the step S621, the detection mechanism 2 outputs a detection result that the energy efficiency is qualified; otherwise, the detection mechanism 2 outputs a detection result with unqualified energy efficiency.
According to the detection method of the oil-cooled permanent magnet motor, the energy efficiency of the air compressor to be detected is tested by adopting a volumetric compressor flow testing method, whether the energy efficiency of the air compressor to be detected is qualified or not can be judged by comparing the energy efficiency of the air compressor to be detected and the energy efficiency of the air compressor for reference, the quality of the produced air compressor is improved, and therefore the use experience of a user is improved.
Further, the controller 11 adjusts the input frequency of the oil-cooled permanent magnet motor 13 according to the rated power E of the oil-cooled permanent magnet motor 13, and specifically includes the steps of:
when E is less than or equal to 55 kilowatts, the controller 11 controls the input frequency of the oil-cooled permanent magnet motor 13 to be equal to 0.3 xA;
when E is more than 55 kilowatts, the controller 11 controls the input frequency of the oil-cooled permanent magnet motor 13 to be equal to 0.4 xA.
The controller 11 adjusts the input frequency of the oil-cooled permanent magnet motor 13 in the third mode according to the rated power E of the oil-cooled permanent magnet motor 13, so that the detection method can be applied to various types of oil-cooled permanent magnet motors 13, and the applicability of the detection method is improved.
Further, please refer to fig. 3, the design parameters further include an engine oil alarm temperature C; the step S200 further includes the steps of:
s210, the controller 11 obtains the engine oil temperature of the oil-cooled permanent magnet motor 13;
s211, if the temperature of the engine oil is more than or equal to C +5, the controller 11 controls the fan 15 to start;
and S212, if the engine oil temperature is less than or equal to C, the controller 11 controls the fan 15 to stop working.
When the air compressor 1 is designed, the highest operating temperature of the engine oil needs to be considered, when the temperature of the engine oil is too high, the viscosity of the engine oil is low, the lubricating effect of the compressor main machine 14 can be affected, the abrasion problem of gears and bearings of the compressor main machine 14 can be caused, and the phenomenon that the gears or the bearings of the compressor main machine 14 are blocked can be caused when the temperature is serious; in addition, when the temperature of the engine oil is too high, the engine oil is carbonized, and the service life of the engine oil is seriously shortened, so that the working state of the fan 15 needs to be adjusted according to the preset engine oil alarm temperature C, and the use effect of the air compressor 1 and the stability and reliability of the air compressor 1 during working are improved; generally speaking, the unit of the engine oil alarm temperature C is centigrade, the engine oil alarm temperature C is less than the maximum engine oil operating temperature, the difference value between the engine oil alarm temperature C and the maximum engine oil operating temperature is 5 centigrade, and the maximum engine oil operating temperature can be preset by a worker according to the use place of the air compressor.
In the process that the controller 11 detects the torque of the air compressor 1 in the first mode, the controller 11 is in communication connection with the detection mechanism 2, the controller 11 obtains the engine oil temperature of the oil-cooled permanent magnet motor 13 in real time, and adjusts the working state of the fan 15 according to the engine oil temperature, so that the working effect of the air compressor 1 is prevented from being influenced by overhigh engine oil temperature, and the normal operation of testing is ensured; the engine oil temperature of the oil-cooled permanent magnet motor 13 is the oil inlet temperature of the oil-cooled permanent magnet motor 13, namely the temperature of the engine oil entering the oil-cooled permanent magnet motor 13.
Further, referring to fig. 3, the design parameters further include an alarm temperature D of the coil of the oil-cooled permanent magnet motor 13; the step S200 further includes the steps of:
s220, the detection mechanism 2 obtains the real-time coil temperature of the oil-cooled permanent magnet motor 13;
s221, if the real-time coil temperature is greater than or equal to D, the detection mechanism 2 outputs a control command for stopping the test to the controller 11.
The unit of the alarm temperature D of the coil of the oil-cooled permanent magnet motor 13 is centigrade, the alarm temperature of the coil of the oil-cooled permanent magnet motor 13 is set for protecting the oil-cooled permanent magnet motor 13, and the oil-cooled permanent magnet motor 13 is prevented from being demagnetized or even burnt when the temperature is too high; the value D may be preset by the operator in the controller 11 and the detection means 2 according to the place of use of the air compressor 1.
When the controller 11 detects the torque of the air compressor 1 in the first mode, the controller 11 is in communication connection with the detection mechanism 2, when the coil temperature is larger than or equal to D, the detection mechanism 2 outputs a control instruction for stopping the test to the controller 11, and the controller 11 controls the air compressor 1 to stop working, so that the oil-cooled permanent magnet motor 13 is prevented from being burnt out due to overheating, and the safety of the test work is improved.
Further, referring to fig. 4, the step S300 further includes the steps of:
s310, the controller 11 obtains the engine oil temperature of the oil-cooled permanent magnet motor 13;
s311, if the temperature of the engine oil is more than or equal to C +5, controlling the fan 15 to start by the controller 11;
s312, if the temperature of the engine oil is less than or equal to C, the controller 11 controls the fan 15 to stop working;
s320, the detection mechanism 2 obtains the real-time coil temperature of the oil-cooled permanent magnet motor 13;
s321, if the real-time coil temperature is greater than or equal to D, the detecting mechanism 2 outputs a control command for stopping the test to the controller 11.
In the process that the controller 11 detects the torque of the air compressor 1 in the second mode, the controller 11 is in communication connection with the detection mechanism 2, the controller 11 obtains the engine oil temperature of the oil-cooled permanent magnet motor 13 in real time, and adjusts the working state of the fan 15 according to the engine oil temperature, so that the working effect of the air compressor 1 is prevented from being influenced by overhigh engine oil temperature, and the normal operation of the test is ensured; in addition, when the coil temperature is larger than or equal to D, the detection mechanism 2 outputs a control instruction for stopping the test to the controller 11, and the controller 11 controls the air compressor 1 to stop working, so that the oil-cooled permanent magnet motor 13 is prevented from being burnt out due to overheating, and the safety of the test work is improved.
Further, referring to fig. 5, the step S400 further includes the steps of:
s410, the controller 11 obtains the engine oil temperature of the oil-cooled permanent magnet motor 13;
s411, if the temperature of the engine oil is more than or equal to C +5, controlling the fan 15 to start by the controller 11;
s412, if the engine oil temperature is less than or equal to C, the controller 11 controls the fan 15 to stop working;
s420, the detection mechanism 2 obtains the real-time coil temperature of the oil-cooled permanent magnet motor 13;
s421, if the real-time coil temperature is greater than or equal to D, the detecting mechanism 2 outputs a control command to stop the test to the controller 11.
In the process that the controller 11 detects the torque of the air compressor 1 in the third mode, the controller 11 is in communication connection with the detection mechanism 2, the controller 11 obtains the engine oil temperature of the oil-cooled permanent magnet motor 13 in real time, and adjusts the working state of the fan 15 according to the engine oil temperature, so that the working effect of the air compressor 1 is prevented from being influenced by overhigh engine oil temperature, and the normal operation of the test is ensured; in addition, when the coil temperature is larger than or equal to D, the detection mechanism 2 outputs a control instruction for stopping the test to the controller 11, and the controller 11 controls the air compressor 1 to stop working, so that the oil-cooled permanent magnet motor 13 is prevented from being burnt out due to overheating, and the safety of the test work is improved.
Referring to fig. 6, the invention further provides a detection system of an oil-cooled permanent magnet motor, wherein the detection system adopts any one of the above detection methods of the oil-cooled permanent magnet motor to realize work control; the detection system comprises a detection mechanism 2 and an air compressor 1; the air compressor 1 comprises a controller 11, and a frequency converter 12, an oil-cooled permanent magnet motor 13, a compressor main unit 14 and a fan 15 which are respectively electrically connected with the controller 11; the controller 11 is used for controlling the operation of the air compressor 1; the frequency converter 12 is connected with a mains supply and is used for driving the oil-cooled permanent magnet motor 13; the oil-cooled permanent magnet motor 13 is used for driving the compressor main machine 14, and the fan 15 is used for cooling the engine oil output by the compressor main machine 14; the detection mechanism 2 is electrically connected with the controller 11, the oil-cooled permanent magnet motor 13 and the compressor main unit 14 respectively; the detection mechanism 2 is used for acquiring the input current of the oil-cooled permanent magnet motor 13, the input frequency of the oil-cooled permanent magnet motor 13 and the exhaust pressure of the air compressor 1 and detecting the engine oil temperature and the coil temperature of the oil-cooled permanent magnet motor 13.
Further, referring to fig. 6, the controller 11 includes a first communication unit 111, and the detection mechanism 2 includes a control unit 21, and a storage unit 23, a second communication unit 22 and a temperature detection portion 24 electrically connected to the control unit 21, respectively; the storage unit 23 stores a control program, and the storage unit 23 is further used for storing various real-time data acquired by the detection mechanism 2; the second communication unit 22 is in wireless communication connection with the first communication unit 111; the temperature detection part 24 is used for detecting the temperature of the engine oil and the temperature of the coil of the oil-cooled permanent magnet motor 13; in one embodiment, the first communication unit 111 and the second communication unit 22 may be WIFI chips or WLAN chips, and the storage unit 23 is a memory in the prior art; the control unit 21 comprises a control circuit board, and a plurality of control chips are arranged on the control circuit board; the temperature detection portion 24 includes a first temperature sensor for detecting the temperature of the engine oil and a second temperature sensor for detecting the temperature of the coil of the oil-cooled permanent magnet motor 13.
Further, referring to fig. 6, the detecting mechanism 2 further includes an electric power analyzer 25 electrically connected to the control unit 21, wherein the electric power analyzer 25 is configured to detect an input voltage, an input current, and an input power of the air compressor 1; the electric power analyzer 25 is arranged to monitor the input voltage, the input current and the input power of the air compressor 1, so that the safety of detection work can be improved, and the normal operation of the detection work can be ensured.
In one embodiment, the detection mechanism 2 further includes a display panel electrically connected to the control unit 21, and the display panel is configured to display a detection result indicating whether the torque and the energy efficiency are qualified.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.
Claims (9)
1. The detection method of the oil-cooled permanent magnet motor is characterized by comprising an air compressor and a detection mechanism, wherein the air compressor comprises a controller, and a compressor main machine, the oil-cooled permanent magnet motor, a fan and a frequency converter which are respectively and electrically connected with the controller; the detection method comprises the following steps:
s100, a controller and a detection mechanism acquire design parameters of an air compressor, wherein the design parameters comprise a rated frequency A of an oil-cooled permanent magnet motor, a rated pressure B of the air compressor, a rated power E of the oil-cooled permanent magnet motor, a maximum long-time allowable current F of a frequency converter and a maximum allowable long-time operation current H of the oil-cooled permanent magnet motor;
s200, starting an air compressor, controlling the input frequency of an oil-cooled permanent magnet motor to be equal to A by a controller, and controlling the air supply pressure of the air compressor to be equal to 1.1 multiplied by B; the detection mechanism acquires and records the input current of the oil-cooled permanent magnet motor, the input frequency of the oil-cooled permanent magnet motor and the exhaust pressure of the air compressor; when the running time of the air compressor is more than or equal to the running time preset in the controller, the controller controls the compressor to stop running;
s300, starting an air compressor, and controlling the input frequency of an oil-cooled permanent magnet motor to be equal to 0.7 xA and the air supply pressure of the air compressor to be equal to 1.1 xB by a controller; the detection mechanism acquires and records the input current of the oil-cooled permanent magnet motor, the input frequency of the oil-cooled permanent magnet motor and the exhaust pressure of the air compressor; when the running time of the air compressor is greater than or equal to the preset running time, the controller controls the compressor to stop running;
s400, starting the air compressor, adjusting the input frequency of the oil-cooled permanent magnet motor by the controller according to the rated power E of the oil-cooled permanent magnet motor, and controlling the air supply pressure of the air compressor to be equal to 1.1 multiplied by B; the detection mechanism acquires and records the input current of the oil-cooled permanent magnet motor, the input frequency of the oil-cooled permanent magnet motor and the exhaust pressure of the air compressor; when the running time of the air compressor is greater than or equal to the preset running time, the controller controls the compressor to stop running;
s500, testing the energy efficiency of the air compressor by the controller according to a volumetric compressor flow testing method, and feeding the tested energy efficiency back to a detection mechanism; the detection mechanism acquires and records the input current of the oil-cooled permanent magnet motor in the detection process;
s600, judging whether the torque of the air compressor is qualified or not or judging whether the energy efficiency of the air compressor is qualified or not by a detection mechanism according to the detection data recorded in the steps S200, S300, S400 and S500; the step S600 specifically includes the steps of:
s610, if the input current of the oil-cooled permanent magnet motor recorded by the detection mechanism in the steps S200, S300 and S400 is smaller than the maximum long-time allowable current F of the frequency converter and smaller than the maximum allowable long-time operation current H of the oil-cooled permanent magnet motor in the detection process, and the input current of the oil-cooled permanent magnet motor recorded by the detection mechanism in the step S500 is smaller than H, the detection mechanism outputs a detection result with qualified torque; otherwise, the detection mechanism outputs a detection result that the torque is not qualified.
2. The method according to claim 1, wherein in step S600, the detecting mechanism determines whether the energy efficiency is qualified according to the detection data recorded by the detecting mechanism in step S200, step S300, step S400, and step S500, and specifically comprises the steps of:
s621, a detection mechanism obtains energy efficiency of a reference air compressor measured by adopting a volumetric compressor flow testing method;
s622, if the energy efficiency measured in the step S500 is better than or equal to the energy efficiency measured in the step S621, the detection mechanism outputs a detection result that the energy efficiency is qualified; otherwise, the detection mechanism outputs a detection result with unqualified energy efficiency.
3. The method for detecting the oil-cooled permanent magnet motor according to claim 1, wherein the controller adjusts the input frequency of the oil-cooled permanent magnet motor according to the rated power E of the oil-cooled permanent magnet motor, and specifically comprises the following steps:
when E is less than or equal to 55 kilowatts, the controller controls the input frequency of the oil-cooled permanent magnet motor to be equal to 0.3 xA;
when E is more than 55 kilowatt, the controller controls the input frequency of the oil-cooled permanent magnet motor to be equal to 0.4 xA.
4. The method of claim 1, wherein the design parameters further include an engine oil alarm temperature C; the step S200 further includes the steps of:
s210, acquiring the engine oil temperature of the oil-cooled permanent magnet motor by a controller;
s211, if the temperature of the engine oil is more than or equal to C +5, controlling the fan to start by the controller;
and S212, if the engine oil temperature is less than or equal to C, controlling the fan to stop working by the controller.
5. The method of claim 4, wherein the design parameters further include an alarm temperature D of the coil of the oil-cooled permanent magnet motor; the step S200 further includes the steps of:
s220, acquiring the real-time coil temperature of the oil-cooled permanent magnet motor by a detection mechanism;
and S221, if the real-time coil temperature is larger than or equal to D, outputting a control instruction for stopping the test to the controller by the detection mechanism.
6. The method for detecting the oil-cooled permanent magnet motor according to claim 5, wherein the step S300 further comprises the steps of:
s310, acquiring the engine oil temperature of the oil-cooled permanent magnet motor by a controller;
s311, if the temperature of the engine oil is more than or equal to C +5, controlling the fan to start by the controller;
s312, if the temperature of the engine oil is less than or equal to C, controlling the fan to stop working by the controller;
s320, acquiring the real-time coil temperature of the oil-cooled permanent magnet motor by a detection mechanism;
s321, if the real-time coil temperature is larger than or equal to D, the detection mechanism outputs a control instruction for stopping the test to the controller.
7. The method for detecting the oil-cooled permanent magnet motor according to claim 5, wherein the step S400 further comprises the steps of:
s410, acquiring the engine oil temperature of the oil-cooled permanent magnet motor by a controller;
s411, if the temperature of the engine oil is more than or equal to C +5, controlling the fan to start by the controller;
s412, if the engine oil temperature is less than or equal to C, controlling the fan to stop working by the controller;
s420, acquiring the real-time coil temperature of the oil-cooled permanent magnet motor by a detection mechanism;
and S421, if the real-time coil temperature is greater than or equal to D, the detection mechanism outputs a control instruction for stopping the test to the controller.
8. The detection system of the oil-cooled permanent magnet motor is characterized in that the detection system adopts the detection method of the oil-cooled permanent magnet motor according to any one of claims 1 to 7 to realize work control; the detection system comprises a detection mechanism and an air compressor; the air compressor comprises a controller, and a frequency converter, an oil-cooled permanent magnet motor, a compressor main machine and a fan which are respectively and electrically connected with the controller; the frequency converter is used for driving the oil-cooled permanent magnet motor, the oil-cooled permanent magnet motor is used for driving the compressor main machine, and the fan is used for cooling the engine oil output by the compressor main machine; the detection mechanism is electrically connected with the controller, the oil-cooled permanent magnet motor and the compressor host respectively; the detection mechanism is used for acquiring the input current of the oil-cooled permanent magnet motor, the input frequency of the oil-cooled permanent magnet motor and the exhaust pressure of the air compressor and detecting the engine oil temperature and the coil temperature of the oil-cooled permanent magnet motor.
9. The system of claim 8, wherein the controller comprises a first communication unit, and the detection mechanism comprises a control unit, a storage unit, a second communication unit and a temperature detection unit, wherein the storage unit, the second communication unit and the temperature detection unit are electrically connected with the control unit respectively; the storage unit stores a control program; the second communication unit is in wireless communication connection with the first communication unit; the temperature detection part is used for detecting the temperature of the engine oil and the temperature of a coil of the oil-cooled permanent magnet motor.
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