CN117077456B - Temperature compensation method of permanent magnet synchronous motor for electronic water pump - Google Patents
Temperature compensation method of permanent magnet synchronous motor for electronic water pump Download PDFInfo
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Abstract
The invention discloses a temperature compensation method of a permanent magnet synchronous motor for an electronic water pump, which comprises the following steps: acquiring a resistance-temperature change curve and an inductance-temperature change curve of the electronic water pump; according to the resistance-temperature change curve and the inductance-temperature change curve of the electronic water pump, setting and calculating the proportional coefficient and the integral coefficient of the current loop current regulator according to a first-order system of engineering code, and calculating the flux linkage and the rotor position of the rotor according to a voltage equation and a flux linkage equation of the permanent magnet synchronous motor; and according to the obtained proportional coefficient, integral coefficient, rotor flux linkage and rotor position, the current loop regulator and the rotor position observer are compensated and regulated in real time according to the temperature. The temperature compensation method of the invention ensures that the electronic water pump not only can adapt to severe low-temperature environment, but also can keep the optimal performance of the permanent magnet synchronous motor of the electronic water pump at low temperature or high temperature.
Description
Technical Field
The invention relates to a permanent magnet synchronous motor, in particular to a temperature compensation method of the permanent magnet synchronous motor for an electronic water pump.
Background
The mechanical water pump driven by the crankshaft of the automobile engine has the problems of difficult low-temperature starting, poor speed regulation effect, low efficiency and the like, and influences the performance of a cooling system. The driving mode of the electronic water pump mainly comprises a permanent magnet brushless direct current motor (BLDC) and a Permanent Magnet Synchronous Motor (PMSM), and the BLDC has the defects of large noise, low efficiency, large torque pulsation and the like, while the PMSM has the characteristics of small volume, small noise, large power density and the like, so that the PMSM has higher and higher proportion in the electronic water pump motor. The electronic water pump for the automobile is usually required to keep normal and efficient operation at the ambient temperature of between 40 ℃ below zero and 60 ℃ below zero. And along with the continuous operation of the motor, the temperature of the motor is also continuously changed, and the internal resistance and inductance parameters of the motor are dynamically changed, so that the performance of a motor control system is affected.
At present, the temperature compensation method of the permanent magnet synchronous motor mainly calculates the relation between the temperature of the motor and the resistance and inductance parameters of the motor according to a theoretical formula according to a motor design simulation model, and the actual compensation effect is poor due to the fact that larger errors exist between parameter theoretical formula calculation and actual application. The electronic water pump motor for the vehicle has the defects of incapability of normal starting, abnormal water pump operation and the like under a low-temperature environment.
Disclosure of Invention
The invention aims to provide a temperature compensation method for a permanent magnet synchronous motor for an electronic water pump, which can be started and operated normally under a severe low-temperature environment.
In order to solve the technical problems, the technical scheme adopted by the invention is that the temperature compensation method of the permanent magnet synchronous motor for the electronic water pump comprises the following steps:
101 Acquiring a resistance-temperature change curve and an inductance-temperature change curve of the electronic water pump;
102 According to the resistance-temperature change curve and the inductance-temperature change curve of the electronic water pump, according to the engineering code type first order system setting, calculating the proportional coefficient and the integral coefficient of the current loop current regulator;
103 According to the resistance-temperature change curve and the inductance-temperature change curve of the electronic water pump, calculating the flux linkage and the rotor position of the rotor according to the voltage equation and the flux linkage equation of the permanent magnet synchronous motor;
104 102) according to the proportional coefficient and the integral coefficient obtained in the step, compensating and adjusting the current loop regulator in real time according to the temperature;
105 According to the rotor flux linkage and rotor position obtained in step 103, and adjusting the rotor position observer according to the temperature real-time compensation.
The temperature compensation method described above, step 101 includes the steps of:
201 Placing the electronic water pump in a temperature-adjustable incubator, and determining a plurality of test temperatures according to a certain temperature interval in a section between the lowest test temperature and the highest test temperature;
202 After the incubator is kept at each test temperature for a set time, measuring the resistance and the inductance of the motor of the electronic water pump by using an LCR tester;
203 Linearly fitting the temperature-resistance data and the temperature-inductance data obtained in the step 202 to obtain the resistance-temperature change curve and the inductance-temperature change curve.
In the temperature compensation method, the interval between the lowest test temperature and the highest test temperature is-40 ℃ to 60 ℃, and the temperature interval is 10 ℃; the number of the electronic water pumps placed in the incubator is plural, the temperature-resistance data in step 203 is the average value of the temperature-resistance data of the plural electronic water pumps, and the temperature-inductance data is the average value of the temperature-inductance data of the plural electronic water pumps.
The temperature compensation method comprises a checking step; placing the electronic water pump to be checked in the incubator, randomly setting a plurality of incubator temperatures, keeping the load of the electronic water pump constant, recording the output current value of the electronic water pump, and keeping the output current value in a set error range at different incubator temperatures; otherwise the process of steps 201 to 203 is to be performed from new.
The temperature compensation method of the invention ensures that the electronic water pump not only can adapt to severe low-temperature environment, but also can keep the optimal performance of the permanent magnet synchronous motor of the electronic water pump at low temperature or high temperature.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a flowchart of a temperature compensation method of a permanent magnet synchronous motor for an electronic water pump according to an embodiment of the present invention.
FIG. 2 is an equivalent structural diagram of a current loop of a temperature compensation method according to an embodiment of the present invention.
Detailed Description
The temperature compensation method of the permanent magnet synchronous motor for the electronic water pump comprises an incubator environment temperature setting module, a resistance and inductance detection module of an LCR tester, a temperature resistance and inductance data table fitting module, a current loop parameter compensation module, a rotor flux linkage/rotor position compensation module and a performance checking module at different temperatures after compensation.
The current loop parameters directly influence the dynamic adjustment capability of the water pump motor, the high-performance water pump motor needs to be started with maximum current in the starting process, and simultaneously can be quickly recovered in external disturbance, so that the dynamic tracking response speed is accelerated, and the stability of the system is improved.
The temperature compensation method of the invention firstly places 5 electronic water pumps in the same temperature-adjustable incubator, and the test temperatures set by the incubator are respectively as follows: -40 ℃, -30 ℃, -20 ℃, -10 ℃,0 ℃, 10 ℃, 20 ℃, 30 ℃, 40 ℃, 50 ℃ and 60 ℃, i.e. the test temperature in the incubator is set to be the lowest-40 ℃ to the highest 60 ℃.
After maintaining at each test temperature for about 1 hour, 5 electronic water pump motor resistances and inductances were measured using an LCR tester.
And respectively linearly fitting the obtained temperature-resistance data and temperature-inductance data to obtain a resistance-temperature change curve and an inductance-temperature change curve. And setting and calculating the proportional coefficient kp and the integral coefficient ki of the current loop current regulator according to the numerical values corresponding to the resistance-temperature change curve and the inductance-temperature change curve according to a typical first-order system of an engineering method. And calculating the rotor flux linkage and the rotor position according to the voltage equation and the flux linkage equation of the permanent magnet synchronous motor by using the values corresponding to the resistance-temperature change curve and the inductance-temperature change curve. And according to the proportional coefficient kp and the integral coefficient ki of the current loop current regulator, the current loop regulator is compensated and regulated in real time according to the temperature. And according to the rotor flux linkage and the rotor position, the rotor position observer is compensated and adjusted in real time according to the temperature. And calculating the current loop coefficient, the rotor flux linkage and the rotor position in real time according to the compensated motor parameters, so that the optimal dynamic and steady-state performance of the permanent magnet synchronous motor of the electronic water pump is realized at different temperatures.
In the specific implementation process, the fitted temperature-resistance and temperature inductance parameters are linearly fitted according to the detection average value of 5 water pump motors. That is, the temperature-resistance data is an average value of 5 pieces of electronic water pump temperature-resistance data, and the temperature-inductance data is an average value of 5 pieces of electronic water pump temperature-inductance data.
In the specific implementation process, the method comprises a performance checking scheme, and the compensated parameters are used for testing the dynamic and steady-state performance of the water pump motor at different temperatures, so that the optimal control performance of the permanent magnet synchronous motor of the electronic water pump at different environmental temperatures is realized. And in the checking process, placing the electronic water pump to be checked in the incubator, keeping the load of the electronic water pump constant according to the random temperature of the incubator, recording the output current value of the electronic water pump, keeping the output current value and the rated current value required to be in the error range of 2% at different temperatures, (the output current value when the rated current value is 25 ℃ and the electronic water pump is provided with the rated load), otherwise, retesting the fitting parameters, and updating the temperature compensation scheme until the checking is passed.
According to the temperature compensation method of the permanent magnet synchronous motor for the electronic water pump, a temperature compensation function is provided for the electronic water pump, the temperature compensation function can detect the ambient temperature in real time under different temperature environments to compensate the influence of motor parameters, and the current loop coefficient, the rotor flux linkage and the rotor position are calculated in real time according to the compensated motor parameters, so that the electronic water pump can adapt to a severe low-temperature environment, and the performance of the permanent magnet synchronous motor of the electronic water pump can be kept optimal at low temperature or high temperature.
Claims (1)
1. The temperature compensation method of the permanent magnet synchronous motor for the electronic water pump is characterized by comprising the following steps of:
101 Acquiring a resistance-temperature change curve and an inductance-temperature change curve of the electronic water pump;
102 According to the resistance-temperature change curve and the inductance-temperature change curve of the electronic water pump, according to the engineering code type first order system setting, calculating the proportional coefficient and the integral coefficient of the current loop current regulator;
103 According to the resistance-temperature change curve and the inductance-temperature change curve of the electronic water pump, calculating the flux linkage and the rotor position of the rotor according to the voltage equation and the flux linkage equation of the permanent magnet synchronous motor;
104 102) according to the proportional coefficient and the integral coefficient obtained in the step, compensating and adjusting the current loop regulator in real time according to the temperature;
105 According to the rotor flux linkage and the rotor position obtained in the step 103, compensating and adjusting a rotor position observer in real time according to the temperature;
Step 101 comprises the steps of:
201 Placing the electronic water pump in a temperature-adjustable incubator, and determining a plurality of test temperatures according to a certain temperature interval in a section between the lowest test temperature and the highest test temperature;
202 After the incubator is kept at each test temperature for a set time, measuring the resistance and the inductance of the motor of the electronic water pump by using an LCR tester;
203 Respectively linearly fitting the temperature-resistance data and the temperature-inductance data obtained in the step 202 to obtain a resistance-temperature change curve and an inductance-temperature change curve;
The interval between the lowest test temperature and the highest test temperature is-40 ℃ to 60 ℃, and the temperature interval is 10 ℃; the number of the electronic water pumps placed in the incubator is plural, the temperature-resistance data in the step 203 is the average value of the temperature-resistance data of the plural electronic water pumps, and the temperature-inductance data is the average value of the temperature-inductance data of the plural electronic water pumps;
Comprises a checking step; placing the electronic water pump to be checked in the incubator, randomly setting a plurality of incubator temperatures, keeping the load of the electronic water pump constant, recording the output current value of the electronic water pump, and keeping the output current value in a set error range at different incubator temperatures; otherwise the process of steps 201 to 203 is to be resumed.
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