CN117559845B - Starting control method and system for water pump motor - Google Patents
Starting control method and system for water pump motor Download PDFInfo
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- CN117559845B CN117559845B CN202410028073.5A CN202410028073A CN117559845B CN 117559845 B CN117559845 B CN 117559845B CN 202410028073 A CN202410028073 A CN 202410028073A CN 117559845 B CN117559845 B CN 117559845B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
- H02H7/0844—Fail safe control, e.g. by comparing control signal and controlled current, isolating motor on commutation error
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details
- H02P1/022—Security devices, e.g. correct phase sequencing
Abstract
The application provides a starting control method and a starting control system for a water pump motor, and relates to the technical field of motor control. The technical scheme provided by the application enables the water pump motor to generate larger torque at the beginning of the starting stage by setting lower first driving current and larger first driving current so as to overcome static friction force and enable the water pump motor to start to run. Meanwhile, the first working current is continuously monitored in the starting stage, and as the first working current is related to the actual rotating speed of the water pump motor, the slip between the actual rotating speed and the synchronous rotating speed of the water pump motor, which is caused by larger friction force, can be prevented from exceeding the normal working range. The friction force influence on the water pump motor can be reduced in the whole starting stage, and the water pump motor can be ensured to enter a normal working stage.
Description
Technical Field
The application relates to the technical field of motor control, in particular to a starting control method and a starting control system for a water pump motor.
Background
With the development of society, various water pump motors are increasingly widely used. However, in actual operation of the water pump motor, the friction force is often changed due to environmental factors, so that the starting current of the water pump motor is greatly different, and when the friction force is too large, the operation current of the water pump motor is too large, and even the water pump motor is damaged.
Aiming at the problem, the related art adopts a variable frequency speed regulation control technology, and the running state of the water pump motor is regulated by changing the running frequency of the motor. However, the variable-frequency speed regulation control technology is low-frequency start or high-frequency start, and the friction force of the water pump motor is large, so that the water pump motor still cannot enter a normal working stage.
Disclosure of Invention
The application provides a starting control method and a control system of a water pump motor, which can reduce the influence of friction force on the water pump motor in the whole starting stage and ensure that the water pump motor can enter a normal working stage.
In a first aspect, the present application provides a method for controlling the start of a water pump motor, the method comprising:
Acquiring rated current, rated voltage and rated frequency of a water pump motor, setting a first driving current larger than the rated current and setting a first driving frequency smaller than the rated frequency;
Controlling the water pump motor to enter a starting stage according to the first driving current and the first driving frequency, and obtaining a first working current of the water pump motor in the starting stage;
Calculating a motor driving voltage according to the first working current and the first driving current;
calculating a normal working voltage according to the first driving frequency, the rated frequency and the rated voltage;
when the time length of the water pump motor in the starting stage is not more than a first preset time length, judging whether the first working current is smaller than the rated current or not;
If the first working current is smaller than the rated current, judging whether a first absolute difference value between the motor driving voltage and the normal working voltage is smaller than a preset voltage difference value or not;
and if the first absolute difference value is smaller than the preset voltage difference value, determining that the water pump motor enters a normal working stage.
Through adopting above-mentioned technical scheme, through setting up lower first drive current to and great first drive current for the water pump motor can produce great moment of torsion when starting the stage, so that overcome static friction and make the water pump motor start to operate. Meanwhile, the first working current is continuously monitored in the starting stage, and as the first working current is related to the actual rotating speed of the water pump motor, the slip between the actual rotating speed and the synchronous rotating speed of the water pump motor, which is caused by larger friction force, can be prevented from exceeding the normal working range. The friction force influence on the water pump motor can be reduced in the whole starting stage, and the water pump motor can be ensured to enter a normal working stage.
Optionally, if the first working current is not less than the rated current or the first absolute difference is not less than a preset voltage difference, the second working current of the water pump motor in the starting stage is obtained again at fixed intervals.
By adopting the technical scheme, in the starting control process of the water pump motor, the first working current needs to be detected and the first absolute difference value needs to be calculated so as to judge whether the motor reaches the normal working stage. If the first working current is still greater than the rated current or the first absolute difference is greater than the preset difference, the water pump motor is not completely started smoothly. The second working current is obtained again at fixed intervals, so that the whole starting process of the motor can be monitored, and the time can be judged to reach the normal working stage.
Optionally, if the first absolute difference between the motor driving voltage and the normal working voltage is smaller than the preset voltage difference, determining that the water pump motor enters the normal working stage further includes:
Determining the times of obtaining the second working current when the water pump motor is in the starting stage;
Determining a first absolute difference value between the motor driving voltage and the normal working voltage and a second absolute difference value between the motor driving voltage and a preset voltage difference value;
and adjusting the first driving current and the first driving frequency according to the times of obtaining the second working current and the second absolute difference value.
By adopting the technical scheme, in the starting control of the water pump motor, the times of obtaining the second working current are counted, and the longer the times are, the longer the starting time is; and simultaneously calculating a second absolute difference value between the first absolute difference value and the preset difference value, wherein an excessive second absolute difference value indicates a poor starting effect. By acquiring the times and the second absolute difference, two indexes of the starting time and the starting effect can be evaluated and used as the parameter basis for adjusting the first driving current and the frequency. Based on the feedback adjustment of the starting duration and the effect, the starting control parameters of the water pump motor are automatically optimized, so that the starting control effect of the water pump motor can be improved, and the starting time of the water pump motor is shortened.
Optionally, the determining the number of times of obtaining the second working current when the water pump motor is in the starting stage includes:
recording the first times when the first working current is not smaller than the rated current;
Recording a second time when the first absolute difference value is not smaller than a preset voltage difference value;
and summing the first times and the second times to obtain the times of obtaining the second working current when the water pump motor is in the starting stage.
Through adopting above-mentioned technical scheme, through the number of times that the record appears the problem, realized carrying out the quantization analysis to the problem that exists in the water pump motor start-up process to carry out the pertinence adjustment, thereby improve the accuracy of start control.
Optionally, the method further comprises:
When the time length of the water pump motor in the starting stage exceeds a first preset time length, suspending the operation of the water pump motor;
Generating starting fault information and recording the starting fault times;
if the starting failure times are greater than preset times, stopping the operation of the water pump motor;
If the starting failure times are not more than the preset times, setting a second driving current which is more than the first driving current after a second preset time period, and setting a second driving frequency which is less than the first driving frequency; taking the second driving current as a first driving current, taking the second driving frequency as a first driving frequency, re-executing the control to enable the water pump motor to enter a starting stage according to the first driving current and the first driving frequency, and obtaining a first working current of the water pump motor in the starting stage; calculating a motor driving voltage according to the first working current and the first driving current; and calculating normal working voltage according to the first driving frequency, the rated frequency and the rated voltage.
By adopting the technical scheme, in the process of starting control of the water pump motor, if the abnormal starting time is detected, the starting failure can be caused by overlarge load or improper parameter setting. To prevent motor damage, the motor operation needs to be suspended in time. And simultaneously, recording the starting failure times, and if the accumulated failure times are excessive, directly stopping the machine. This can avoid the motor from being damaged by repeated faulty starts. And (3) processing the starting faults, judging whether to restart or directly stopping the machine to prevent damage according to the number of faults. Meanwhile, a closed-loop control mechanism is adopted to dynamically adjust parameters, so that the motor can be started smoothly.
Optionally, the calculating the motor driving voltage according to the first operating current and the first driving current includes:
acquiring internal setting parameters of the water pump motor;
Substituting the first working current, the first driving current and the internal setting parameters into a motor driving voltage calculation formula to obtain motor driving voltage;
the motor driving voltage calculation formula is as follows:
；
wherein, For the difference between the first driving current and the first operating current obtained at the kth time,For the motor drive voltage calculated from the first operating current obtained at the kth time,、AndParameters are set for the interior.
By adopting the technical scheme, the driving voltage is calculated according to the working current, so that the accurate actual driving voltage value of the water pump motor can be obtained, and a basis is provided for subsequent judgment.
Optionally, the calculating the normal operating voltage according to the first driving frequency, the rated frequency and the rated voltage includes:
substituting the first driving frequency, the rated frequency and the rated voltage into a normal working voltage calculation formula to obtain a normal working voltage;
the normal working voltage calculation formula is as follows:
；
wherein, For the said normal operating voltage to be present,For the first driving frequency to be the first driving frequency,For the frequency to be said to be the nominal frequency,Is the rated voltage.
By adopting the technical scheme, the normal working voltage is calculated according to the driving frequency and the rated frequency, so that the theoretical normal working voltage value of the water pump motor can be rapidly and accurately obtained.
In a second aspect, the present application provides a start control system for a water pump motor, the system comprising:
the rated parameter acquisition module is used for acquiring rated current, rated voltage and rated frequency of the water pump motor, setting a first driving current larger than the rated current and setting a first driving frequency smaller than the rated frequency;
The working current acquisition module is used for controlling the water pump motor to enter a starting stage according to the first driving current and the first driving frequency and acquiring a first working current of the water pump motor in the starting stage;
the driving voltage calculation module is used for calculating motor driving voltage according to the first working current and the first driving current;
The normal working voltage calculation module is used for calculating normal working voltage according to the first driving frequency, the rated frequency and the rated voltage;
The current judging module is used for judging whether the first working current is smaller than the rated current or not when the time length of the water pump motor in the starting stage is not longer than a first preset time length;
The voltage judging module is used for judging whether the first absolute difference value between the motor driving voltage and the normal working voltage is smaller than a preset voltage difference value or not if the first working current is smaller than the rated current;
and the normal working stage determining module is used for determining that the water pump motor enters a normal working stage if the first absolute difference value is smaller than a preset voltage difference value.
In a third aspect, the present application provides a computer storage medium storing a plurality of instructions adapted to be loaded by a processor and to perform any of the methods described above.
In a fourth aspect, the present application provides an electronic device comprising a processor, a memory for storing instructions, and a transceiver for communicating with other devices, the processor for executing instructions stored in the memory to cause the electronic device to perform a method as in any one of the above.
In summary, the technical scheme of the application has the following beneficial effects:
1. By setting the lower first drive current and the larger first drive current, the water pump motor can generate larger torque at the beginning of the starting stage so as to overcome static friction force and enable the water pump motor to start to operate. Meanwhile, the first working current is continuously monitored in the starting stage, and as the first working current is related to the actual rotating speed of the water pump motor, the slip between the actual rotating speed and the synchronous rotating speed of the water pump motor, which is caused by larger friction force, can be prevented from exceeding the normal working range. Therefore, the influence of friction force on the water pump motor can be reduced, and the water pump motor can be ensured to enter a normal working stage.
2. In the starting control of the water pump motor, counting the times of obtaining the second working current, wherein the longer the times are, the longer the starting time is; and simultaneously calculating a second absolute difference value between the first absolute difference value and the preset difference value, wherein an excessive second absolute difference value indicates a poor starting effect. By acquiring the times and the second absolute difference, two indexes of the starting time and the starting effect can be evaluated and used as the parameter basis for adjusting the first driving current and the frequency. Based on the feedback adjustment of the starting duration and the effect, the starting control parameters of the water pump motor are automatically optimized, so that the starting control effect of the water pump motor can be improved, and the starting time of the water pump motor is shortened.
Drawings
Fig. 1 is a schematic flow chart of a method for controlling the start of a water pump motor according to an embodiment of the present application;
Fig. 2 is a schematic structural diagram of a starting control system of a water pump motor according to an embodiment of the present application;
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Reference numerals illustrate: 201. a rated parameter acquisition module; 202. a working current acquisition module; 203. a driving voltage calculation module; 204. a normal operating voltage calculation module; 205. a current judgment module; 206. a voltage judgment module; 207. a normal working stage determining module; 300. an electronic device; 301. a processor; 302. a communication bus; 303. a user interface; 304. a network interface; 305. a memory.
Description of the embodiments
In order to make the technical solutions in the present specification better understood by those skilled in the art, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments.
In describing embodiments of the present application, words such as "exemplary," "such as" or "for example" are used to mean serving as examples, illustrations or explanations. Any embodiment or design described herein as "illustrative," "such as" or "for example" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "illustratively," "such as" or "for example," etc., is intended to present related concepts in a concrete fashion.
In the description of embodiments of the application, the term "plurality" means two or more. For example, a plurality of systems means two or more systems, and a plurality of screen terminals means two or more screen terminals. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating an indicated technical feature. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
Referring to fig. 1, a flow chart of a method for controlling the start of a water pump motor according to an embodiment of the present application may be implemented by a computer program, may be implemented by a single chip microcomputer, or may be operated on a start control system of a water pump motor based on von neumann system. The computer program may be integrated in the application or may run as a stand-alone tool class application. Specific steps of the starting control method of the water pump motor are described in detail below.
S101: and acquiring rated current, rated voltage and rated frequency of the water pump motor, setting a first driving current larger than the rated current and setting a first driving frequency smaller than the rated frequency.
Firstly, a rated parameter acquisition component is called to acquire rated current, rated voltage and rated frequency of a water pump motor. The rated current is an inherent parameter of the water pump motor and represents the current level during normal operation. The rated voltage refers to the power supply voltage of the water pump motor during normal operation. The rated frequency refers to the power supply frequency of the water pump motor in the normal working stage.
The first driving current refers to a driving current value required by the water pump motor in a starting stage, and is larger than a rated current of the water pump motor. The first drive current is specifically set according to the rated current of the water pump motor, and is aimed at providing a sufficient starting torque to start the water pump motor when the water pump motor is started. The first driving frequency refers to a driving frequency value required by the water pump motor in a starting stage, and is smaller than a rated frequency of the water pump motor. The first driving frequency is specifically set according to the rated frequency of the water pump motor, and the purpose of the first driving frequency is to enable the water pump motor to operate at a lower frequency in a starting stage so as to realize soft start.
The first driving frequency and the first driving current together control the water pump motor to enter a soft start process according to the values of the two parameters, and in the process, the controller gradually adjusts the frequency according to the actual working state of the motor to bring the working of the motor to a normal rated frequency.
The first driving current larger than the rated current is set to provide enough starting torque to meet the requirements of the rotating speed and the output power of the water pump motor when the water pump motor is started. The first driving frequency smaller than the rated frequency is set to reduce the rotation speed of the water pump motor, realize soft start and prevent mechanical failure of the water pump motor caused by friction force in the initial stage of start.
In an alternative embodiment, the first drive current may be set to 1.3 times the rated current and the first drive frequency may be set to 0.5 times the rated frequency.
S102: and controlling the water pump motor to enter a starting stage according to the first driving current and the first driving frequency, and acquiring a first working current of the water pump motor in the starting stage.
The starting stage refers to a transition stage between the water pump motor starting from a static state and reaching a normal working stage. In this phase, the water pump motor is operated at a preset first drive current and a first drive frequency, which are lower than the nominal value.
Specifically, control signals corresponding to the first driving current and the first driving frequency are generated, and the variable frequency driver of the water supply pump motor is sent in an analog quantity mode after digital-to-analog conversion, so that the driver is controlled to output corresponding driving voltage and frequency according to the set first driving current and first driving frequency, and the water pump motor is driven to enter a starting stage according to the set driving parameters.
The method comprises the steps of acquiring current of a water pump motor during operation, and acquiring digital quantity of first working current of the water pump motor under a first driving parameter through analog-to-digital conversion of an analog current signal so as to monitor actual operation state of the motor under a preset first driving parameter and serve as feedback input of a follow-up closed-loop control algorithm. The first operating current refers to an actual operating current of the water pump motor at the first driving current and the first driving frequency. The detection and acquisition of the first working current can reflect the actual running state of the water outlet pump motor under the set first driving parameter. Since the mechanical and electrical characteristics of the water pump motor itself affect its actual operation under preset parameters, it is necessary to detect its actual first operating current.
S103: and calculating the motor driving voltage according to the first working current and the first driving current.
The first operating current reflects the actual running condition and load size of the water pump motor under the set first driving parameters. The first driving current is a required driving current preset according to rated parameters of the water pump motor. According to the parameters of the two currents, the actual driving voltage of the armature winding of the water pump motor under the condition can be obtained through calculation of the electromagnetic relation of the motor.
The motor driving voltage is understood to be a voltage for driving the water pump motor to rotate. The driving voltage is calculated according to the actual running state of the motor and the load size and is used for accurately controlling the rotating speed and the output power of the water pump motor. By closed loop control of the drive voltage, it is ensured that a voltage sufficient to drive the motor to rotate is provided during the start-up of the water pump motor.
In a specific implementation, acquiring internal setting parameters of a water pump motor;
Substituting the first working current, the first driving current and the internal setting parameters into a motor driving voltage calculation formula to obtain motor driving voltage;
The motor driving voltage calculation formula is:
；
wherein, For the difference between the first driving current and the first operating current obtained at the kth time,For the motor drive voltage calculated from the first operating current obtained at the kth time,、AndParameters are set for the interior.
In order to further accurately calculate the driving voltage of the water pump motor, it is necessary to obtain internal setting parameters of the water pump motor, and substitute the first working current, the first driving current and the internal setting parameters into a calculation formula of the motor driving voltage for calculation.
After the first working current of the water pump motor is detected and obtained, the internal setting parameters of the water pump motor are obtained, wherein the internal setting parameters comprise a proportional coefficient, an integral coefficient and a differential coefficient. In motor control, the scaling factor determines the direct relationship between the output response and the error. Increasing increases the sensitivity of the controller to errors, so that the output responds to errors faster. However, excessive amounts may cause the system to oscillate or be unstable. The integration factor takes into account the accumulation of past errors and removes steady state errors of the system by integration. Increasing increases the integration and helps to eliminate steady state errors, but excessive increases may lead to excessive system response, causing oscillations or instability. The differential coefficient predicts a future error change from the rate of change of the error, and suppresses system oscillation by reducing the response speed. Increasing may increase the stability and response speed of the system, but excessive may result in the system being more sensitive to noise and interference.
These internal set parameters reflect the electrical characteristics of the particular water pump motor. And finally, substituting the obtained first working current, the set first driving current and the internal setting parameters into a motor driving voltage calculation formula to calculate, and obtaining accurate motor driving voltage through proportional, integral and differential regulation. And calculating the driving voltage by adopting a PID closed-loop control algorithm according to the actual electrical characteristics and the real-time state of the water pump motor. Compared with the simple setting of a preset voltage, the PID control can better adapt to the requirements of the motor, and realize stable start
S104: and calculating the normal working voltage according to the first driving frequency, the rated frequency and the rated voltage.
The normal working voltage refers to the normal power supply voltage of the water pump motor under the rated frequency and rated voltage conditions, and is the voltage value of the water pump motor in a stable state when the water pump motor works normally. The normal working voltage is a reference value calculated in advance according to the rated frequency and rated voltage of the water pump motor. The function of the device is to judge whether the water pump motor smoothly enters the normal working stage from the starting stage.
Specifically, in the starting process of the water pump motor, the first working current of the motor can be detected in real time, and the driving voltage is calculated according to the working current. When the difference between the driving voltage and the pre-calculated normal working voltage is smaller than the set threshold value, the water pump motor can be determined to enter a normal working stage, and the water pump motor can be switched to the rated frequency and the rated voltage to perform normal working.
In an alternative embodiment, substituting the first driving frequency, the rated frequency and the rated voltage into a normal working voltage calculation formula to obtain a normal working voltage;
The normal operating voltage calculation formula is:
；
wherein, For a normal operating voltage to be applied,For the first driving frequency to be the first driving frequency,For the nominal frequency to be a set value,Is rated voltage.
The working voltage of the motor is in direct proportion to the power supply frequency; when the motor works normally, the power supply frequency is rated frequency, and the power supply voltage is rated voltage. In the starting stage, the power supply frequency is a first driving frequency and is lower than the rated frequency. Therefore, the value of the normal operating voltage can be estimated by the ratio of the first driving frequency to the rated frequency.
The advantage of calculating the normal working voltage is to provide a reference for the subsequent judgment of whether the motor enters the normal working stage. In the starting process, the monitored actual driving voltage is compared with the pre-calculated normal working voltage, and if the difference value is within the allowable range, the motor can be judged to have been shifted to the normal working stage from the starting process.
S105: and when the time length of the water pump motor in the starting stage is not more than the first preset time length, judging whether the first working current is smaller than the rated current or not.
In the process of controlling the starting of the water pump motor, the starting time of the motor under a preset first driving parameter needs to be monitored in real time. The starting time length needs to be controlled within a reasonable range, so that the smooth completion of the starting process is ensured, and the damage to the motor caused by overlong starting time is avoided.
Thus, a first preset time period is set as a time period threshold for the start-up phase. The time length monitoring module is called, so that the passing time length of the water pump motor in the starting stage can be detected in real time. And comparing the monitored starting time with a preset first preset time. If the monitored starting time period does not exceed the first preset time period, the water pump motor is indicated to be still in the normal starting process, and the allowable maximum starting time period is not exceeded yet.
Next, a first operating current of the water pump motor at the first driving parameter is detected and compared with a rated current of the water pump motor. This is because the first operating current may reflect the actual operating condition and load size of the water pump motor under the start-up parameters. Comparing the first operating current with the rated current, it can be determined whether the motor has approached a normal operating phase.
Specifically, a current detection module is called to obtain a first working current of a water pump motor at a certain moment in the starting process; and comparing the detected first operating current with a stored rated current value. If the first working current is smaller than the rated current, the working current of the water pump motor under the starting parameter is close to the rated working state, and the starting process is about to end.
The specific step of monitoring that the time length of the water pump motor in the starting stage exceeds the first preset time length can be that the first working current is collected at fixed time length intervals, the collection times are recorded each time, and when the fixed time length intervals are collected for a certain number of times, the certain collection time length is corresponding, so that whether the time length of the water pump motor in the starting stage exceeds the first preset time length can be judged. For example, the fixed duration of the interval may be set to 0.5 seconds, that is, 0.5 seconds is taken to collect the first working current once, and 2.5 seconds is the first preset duration, so that when the 5 th time is taken, it can be determined that the duration of the water pump motor in the start stage exceeds the first preset duration.
In an alternative embodiment, when the duration of the water pump motor in the starting stage is monitored to exceed the first preset duration, the operation of the water pump motor is suspended;
Generating starting fault information and recording the starting fault times;
If the number of the start faults is greater than the preset number, stopping the operation of the water pump motor;
if the number of start faults is not greater than the preset number of times, setting a second driving current greater than the first driving current after a second preset time period, and setting a second driving frequency smaller than the first driving frequency; taking the second driving current as the first driving current, taking the second driving frequency as the first driving frequency, re-executing the control of the water pump motor to enter a starting stage according to the first driving current and the first driving frequency, and obtaining a first working current of the water pump motor in the starting stage; calculating a motor driving voltage according to the first working current and the first driving current; and calculating the normal working voltage according to the first driving frequency, the rated frequency and the rated voltage.
In the starting control process of the water pump motor, if the detected time length of the water pump motor in the starting stage exceeds the preset first preset time length, the starting process is abnormal, and corresponding control measures are needed. An alternative specific arrangement is that the preset number of times is 5 and the second preset duration is 10 seconds.
This may occur because the friction of the water pump motor is too great to be started normally under the preset first driving parameters. In order to prevent the motor from malfunctioning due to long high load operation, the start-up pause module needs to be invoked immediately to pause the operation of the water pump motor, thereby disengaging it from a possible mechanical overload condition.
Next, this startup-fault event is recorded by the startup-fault processing module. And comparing the starting fault times with a preset allowable fault times limit value. If the number of start-up faults exceeds a preset limit value, the water pump motor is indicated to have serious and continuous start-up faults, and mechanical faults or parameter setting errors are likely to occur. And calling a stop module at the moment to stop the operation of the water pump motor completely.
On the other hand, if the recorded number of start-up failures is still within the allowable range, it is determined that the start-up failure at this time may be caused by improper parameter setting. After waiting for a preset time period, the parameter adjustment module is called, and the second driving current and the second driving frequency are set so that the second driving current and the second driving frequency are more suitable for the actual working state of the water pump motor relative to the first driving parameter. And the second driving parameter is used to replace the first driving parameter, and the starting process is re-executed.
In a new start-up cycle, it is still necessary to periodically detect the first operating current of the water pump motor. Calculating a driving voltage according to the actual current, the driving current and the internal parameters; and calculating the normal working voltage according to the driving frequency, the rated frequency and the rated voltage. By continuously adjusting the driving parameters, the water pump motor can be started smoothly to enter a normal working stage.
S106: if the first working current is smaller than the rated current, judging whether the first absolute difference value between the motor driving voltage and the normal working voltage is smaller than the preset voltage difference value.
In the starting process of controlling the water pump motor, if the first working current is detected to be smaller than the rated current, the water pump motor is indicated to be close to a normal working stage under the preset first driving parameter. However, judging from the current value is not enough, and voltage information is detected to determine whether the start-up process can be exited.
In the process of controlling the starting of the water pump motor, in order to fully ensure that the motor can stably transition to a normal working stage, two key parameters of working current and working voltage of the motor need to be monitored and judged.
Specifically, first, when the controller detects that the water pump motor is operated under the preset first driving parameter, the operating current value, namely the first operating current, of the water pump motor is lower than the rated current of the motor, which means that the operating current of the motor is close to the rated operating state, and the condition of large current in the initial starting stage is relieved.
But the condition of current drop alone is not sufficient to conclude that the motor has fully achieved a smooth start. Therefore, after the current is judged, the controller also needs to call a voltage calculation unit to calculate the theoretical voltage value of the motor under the normal working condition according to the known first driving frequency, the rated frequency and the rated voltage of the water pump motor, namely the normal working voltage.
And then, measuring the actual running voltage of the water pump motor under the current first driving parameter, namely the motor driving voltage. Comparing the driving voltage value with the normal working voltage calculated before, and if the absolute difference value of the driving voltage value and the normal working voltage is smaller than the allowable voltage difference value preset by the controller, determining that the working voltage of the water pump motor is close to the normal voltage in the rated state under the current driving parameters.
At this time, the controller can judge that the water pump motor has realized steady start, can directly drive the motor and switch over to rated voltage and rated frequency, operates in stable normal working phase. If the difference between the two voltages is too large, the driving parameters need to be continuously adjusted, and the starting process is restarted until the difference between the two voltages becomes small enough. The preset voltage difference may be set to 10% of the rated voltage of the water pump motor.
In an alternative embodiment, if the first working current is not less than the rated current or the first absolute difference is not less than the preset voltage difference, the second working current of the water pump motor in the starting stage is obtained again at fixed intervals.
When the first working current is not smaller than the rated current or the first absolute difference is not smaller than any one of the preset voltage difference, the next step can not be started, the second working current of the water pump motor under the starting parameters needs to be collected at fixed intervals again, and the judgment is continued by the second working current, so that the purpose of obtaining the time for entering the normal working stage is achieved.
When any one of the two conditions that the first working current is not smaller than the rated current or the first absolute difference is not smaller than the preset voltage difference occurs, the water pump motor is not in a state capable of entering a normal working stage. At this time, the judgment of whether the water pump motor enters normal operation in the next step cannot be directly performed, and the water pump motor needs to wait for a fixed time again, and the second working current of the water pump motor under the starting parameters is collected again.
The purpose of obtaining the second working current is to continue to monitor the actual running state of the water pump motor and judge whether it meets the condition of entering normal operation. By re-acquiring the operating current, it is known whether the water pump motor has improved after a period of time of action of the start-up parameters.
In an alternative embodiment, the number of times the second operating current is obtained when the water pump motor is in the start-up phase is determined;
Determining a first absolute difference value between the motor driving voltage and the normal working voltage and a second absolute difference value between the motor driving voltage and a preset voltage difference value;
and adjusting the first driving current and the first driving frequency according to the times of obtaining the second working current and the second absolute difference value.
Specifically, in the process of starting control of the water pump motor, each time the second working current is obtained is performed after a fixed time interval. The number of times the second operating current is drawn therefore represents in effect the length of time that the water pump motor has undergone from the start of start-up to the final successful normal operating phase. The more the number of acquisitions, the longer the time required for the pump motor to achieve a smooth start. Otherwise, if the acquisition times are small, the water pump motor can finish the starting process in a short time to enter a normal working stage. The number of times of obtaining the second working current is determined, and the time required for starting the water pump motor is actually counted. A large number of acquisitions indicates a long start-up time, which may be caused by incorrect setting of the driving parameters. After the acquisition times are counted, the method can be used as an important basis for judging the starting effect of the water pump motor.
In the starting control process of the water pump motor, the actual driving voltage and the theoretical normal working voltage of the motor are measured and calculated, and the numerical difference between the actual driving voltage and the theoretical normal working voltage, namely the first absolute difference value, is calculated, so that whether the current driving parameters enable the working voltage of the motor to be close to an ideal state can be judged.
Furthermore, it is necessary to measure the distance between the two threshold values, namely the first absolute difference and the preset allowed voltage difference, i.e. the second absolute difference. The second absolute difference value enables an assessment of a reasonable degree of accuracy of the preset threshold.
According to the two measurement results, if the first absolute difference value is too large, parameters of the driving current or frequency need to be adjusted; if the second absolute difference is too large, a more reasonable voltage threshold needs to be reset.
In an alternative embodiment, a first number of occurrences of the first operating current being no less than the rated current is recorded;
Recording a second time when the first absolute difference value is not smaller than the preset voltage difference value;
And summing the first times and the second times to obtain the times of obtaining the second working current when the water pump motor is in the starting stage.
In the starting control process of the water pump motor, in order to obtain the total times of the second working current through statistical analysis, two recording modules can be arranged to respectively record the following conditions:
first, when the first working current is detected to be not smaller than the rated current, the first recording module records the occurrence times at the moment to obtain a first time. And secondly, if the first absolute difference between the motor driving voltage and the normal working voltage is detected to be not smaller than the preset allowable voltage difference, the second recording module records the frequency of occurrence at the moment to obtain a second frequency.
Both recording modes can reflect the problems existing in the starting process of the water outlet pump motor, and the current is overlarge and the voltage is inaccurate to match. The greater the number of recordings, the more frequently the problem occurs, and improvement of the driving parameters is required.
And finally, sending the times of the two recording conditions to a statistics module for summation operation. The summation result can obtain the total times of the second working current of the water pump motor in the whole starting stage.
S107: if the first absolute difference value is smaller than the preset voltage difference value, the water pump motor is determined to enter a normal working stage.
In the process of starting control of the water pump motor, the motor is required to be stably switched into a normal working stage from a starting stage. In order to judge the switching time, the current driving voltage and the normal working voltage of the motor need to be calculated, and the value difference is compared.
The current driving voltage can be obtained through measuring and calculating parameters such as detection current. The normal operating voltage may be pre-calculated based on the rated voltage and frequency parameters of the motor. The numerical difference between the two can directly reflect the approaching degree of the actual working voltage and the ideal voltage of the motor.
In this start-up control phase, the voltage difference can be recalculated each time the drive parameter adjustment is completed. When the measurement result is smaller than the preset allowable voltage difference range, the motor working voltage can be judged to be close to the normal state, and stable transition is realized.
At this time, the controller can confirm that the motor has entered the normal working phase according to the judgment result of the voltage difference, and the starting process is successfully completed. Then the controller directly outputs a control signal to operate the motor according to the rated voltage and frequency requirements so as to make the motor stably work.
The following are system embodiments of the present application that may be used to perform method embodiments of the present application. For details not disclosed in the system embodiments of the present application, please refer to the application method embodiments.
Referring to fig. 2, a schematic diagram of a start control system of a water pump motor according to an exemplary embodiment of the present application is shown. The system may be implemented as all or part of a system by software, hardware, or a combination of both. The system comprises a rated parameter acquisition module 201, an operating current acquisition module 202, a driving voltage calculation module 203, a normal operating voltage calculation module 204, a current judgment module 205, a voltage judgment module 206 and a normal operating stage determination module 207.
The rated parameter obtaining module 201 is configured to obtain a rated current, a rated voltage and a rated frequency of the water pump motor, set a first driving current greater than the rated current, and set a first driving frequency less than the rated frequency;
The working current obtaining module 202 is configured to control the water pump motor to enter a starting stage according to a first driving current and a first driving frequency, and obtain a first working current of the water pump motor in the starting stage;
a driving voltage calculating module 203, configured to calculate a motor driving voltage according to the first operating current and the first driving current;
the normal operating voltage calculating module 204 is configured to calculate a normal operating voltage according to the first driving frequency, the rated frequency, and the rated voltage;
the current judging module 205 is configured to judge whether the first working current is less than the rated current when it is monitored that the duration of the water pump motor in the start stage does not exceed a first preset duration;
the voltage judging module 206 is configured to judge whether a first absolute difference between the motor driving voltage and the normal operating voltage is smaller than a preset voltage difference if the first operating current is smaller than the rated current;
the normal working stage determining module 207 is configured to determine that the water pump motor enters the normal working stage if the first absolute difference is smaller than the preset voltage difference.
Optionally, the starting control system of the water pump motor further comprises a second working current acquisition unit, an adjustment unit and a second working current recording unit.
And the second working current acquisition unit is used for acquiring the second working current of the water pump motor in the starting stage again at fixed intervals if the first working current is not smaller than the rated current or the first absolute difference value is not smaller than the preset voltage difference value.
The adjusting unit is used for determining the times of obtaining the second working current when the water pump motor is in the starting stage; determining a first absolute difference value between the motor driving voltage and the normal working voltage and a second absolute difference value between the motor driving voltage and a preset voltage difference value; and adjusting the first driving current and the first driving frequency according to the times of obtaining the second working current and the second absolute difference value.
The second working current recording unit is used for recording the first times when the first working current is not smaller than the rated current; recording a second time when the first absolute difference value is not smaller than the preset voltage difference value; and summing the first times and the second times to obtain the times of obtaining the second working current when the water pump motor is in the starting stage.
Optionally, the starting control system of the water pump motor further comprises a fault processing unit.
The fault processing unit is used for suspending the operation of the water pump motor when the time length of the water pump motor in the starting stage exceeds a first preset time length; generating starting fault information and recording the starting fault times; if the number of the start faults is greater than the preset number, stopping the operation of the water pump motor; if the number of start faults is not greater than the preset number of times, setting a second driving current greater than the first driving current after a second preset time period, and setting a second driving frequency smaller than the first driving frequency; taking the second driving current as a first driving current, taking the second driving frequency as a first driving frequency, and re-executing the control to enable the water pump motor to enter a starting stage according to the first driving current and the first driving frequency, and obtaining a first working current of the water pump motor in the starting stage; calculating a motor driving voltage according to the first working current and the first driving current; and calculating normal working voltage according to the first driving frequency, the rated frequency and the rated voltage.
Optionally, the driving voltage calculating module 203 further includes a first formula calculating unit.
The first formula calculation unit is used for acquiring internal setting parameters of the water pump motor; substituting the first working current, the first driving current and the internal setting parameters into a motor driving voltage calculation formula to obtain motor driving voltage; the motor driving voltage calculation formula is:
；
wherein, For the difference between the first driving current and the first operating current obtained at the kth time,For the motor drive voltage calculated from the first operating current obtained at the kth time,、AndParameters are set for the interior.
Optionally, the normal operating voltage calculation module 204 further includes a second formula calculation unit.
The second formula calculation unit is used for substituting the first driving frequency, the rated frequency and the rated voltage into a normal working voltage calculation formula to obtain a normal working voltage; the normal operating voltage calculation formula is:
；
wherein, For a normal operating voltage to be applied,For the first driving frequency to be the first driving frequency,For the nominal frequency to be a set value,Is rated voltage.
The embodiment of the present application further provides a computer storage medium, where the computer storage medium may store a plurality of instructions, where the instructions are suitable for being loaded by a processor and executed by the processor, where the specific execution process may be referred to in the specific description of the embodiment shown in fig. 1, and details are not repeated herein.
Referring to fig. 3, a schematic structural diagram of an electronic device is provided in an embodiment of the present application. As shown in fig. 3, the electronic device 300 may include: at least one processor 301, at least one network interface 304, a user interface 303, a memory 305, at least one communication bus 302.
Wherein the communication bus 302 is used to enable connected communication between these components.
The user interface 303 may include a standard wired interface, a wireless interface, among others.
The network interface 304 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface), among others.
Wherein the processor 301 may include one or more processing cores. The processor 301 utilizes various interfaces and lines to connect various portions of the overall server, perform various functions of the server and process data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 305, and invoking data stored in the memory 305. Alternatively, the processor 301 may be implemented in at least one hardware form of digital signal Processing (DIGITAL SIGNAL Processing, DSP), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA), programmable logic array (Programmable Logic Array, PLA). The processor 301 may integrate one or a combination of several of a central processing unit (Central Processing Unit, CPU), an image processor (Graphics Processing Unit, GPU), and a modem, etc. The CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for rendering and drawing the content required to be displayed by the display screen; the modem is used to handle wireless communications. It will be appreciated that the modem may not be integrated into the processor 301 and may be implemented by a single chip.
The Memory 305 may include a random access Memory (Random Access Memory, RAM) or a Read-Only Memory (Read-Only Memory). Optionally, the memory 305 includes a non-transitory computer readable medium (non-transitory computer-readable storage medium). Memory 305 may be used to store instructions, programs, code, sets of codes, or sets of instructions. The memory 305 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing the above-described respective method embodiments, etc.; the storage data area may store data or the like involved in the above respective method embodiments. Memory 305 may also optionally be at least one storage device located remotely from the aforementioned processor 301. As shown in fig. 3, an operating system, a network communication module, a user interface module, and an application program of a start control method of a water pump motor may be included in the memory 305 as a computer storage medium.
In the electronic device 300 shown in fig. 3, the user interface 303 is mainly used for providing an input interface for a user, and acquiring data input by the user; and the processor 301 may be configured to invoke an application program in the memory 305 that stores a method for controlling the start-up of the water pump motor, which when executed by one or more processors, causes the electronic device to perform the method as in one or more of the embodiments described above.
An electronic device readable storage medium storing instructions. The method of one or more of the above embodiments is performed by one or more processors, which when executed by an electronic device.
It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all of the preferred embodiments, and that the acts and modules referred to are not necessarily required for the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, such as a division of units, merely a division of logic functions, and there may be additional divisions in actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some service interface, device or unit indirect coupling or communication connection, electrical or otherwise.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable memory. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in whole or in part in the form of a software product stored in a memory, comprising several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method of the various embodiments of the present application. And the aforementioned memory includes: various media capable of storing program codes, such as a U disk, a mobile hard disk, a magnetic disk or an optical disk.
The above are merely exemplary embodiments of the present disclosure and are not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains.
Claims (9)
1. A method for controlling the start-up of a water pump motor, the method comprising:
Acquiring rated current, rated voltage and rated frequency of a water pump motor, setting a first driving current larger than the rated current and setting a first driving frequency smaller than the rated frequency;
Controlling the water pump motor to enter a starting stage according to the first driving current and the first driving frequency, and obtaining a first working current of the water pump motor in the starting stage;
Calculating a motor driving voltage according to the first working current and the first driving current;
calculating a normal working voltage according to the first driving frequency, the rated frequency and the rated voltage;
And calculating a normal working voltage according to the first driving frequency, the rated frequency and the rated voltage, wherein the normal working voltage comprises the following components: substituting the first driving frequency, the rated frequency and the rated voltage into a normal working voltage calculation formula to obtain a normal working voltage;
the normal working voltage calculation formula is as follows:
；
wherein, For the normal operating voltage,/>For the first driving frequency,/>For the frequency to be said to be the nominal frequency,Is the rated voltage;
when the time length of the water pump motor in the starting stage is not more than a first preset time length, judging whether the first working current is smaller than the rated current or not;
If the first working current is smaller than the rated current, judging whether a first absolute difference value between the motor driving voltage and the normal working voltage is smaller than a preset voltage difference value or not;
and if the first absolute difference value is smaller than the preset voltage difference value, determining that the water pump motor enters a normal working stage.
2. The method according to claim 1, wherein the method further comprises:
And if the first working current is not smaller than the rated current or the first absolute difference value is not smaller than a preset voltage difference value, re-acquiring a second working current of the water pump motor in the starting stage at fixed intervals.
3. The method of claim 2, wherein if the first absolute difference is less than a preset voltage difference, determining that the water pump motor enters a normal operation phase further comprises:
Determining the times of obtaining the second working current when the water pump motor is in the starting stage;
Determining a first absolute difference value between the motor driving voltage and the normal working voltage and a second absolute difference value between the motor driving voltage and a preset voltage difference value;
and adjusting the first driving current and the first driving frequency according to the times of obtaining the second working current and the second absolute difference value.
4. A method according to claim 3, wherein said determining the number of times the second operating current is obtained when the water pump motor is in the start-up phase comprises:
recording the first times when the first working current is not smaller than the rated current;
Recording a second time when the first absolute difference value is not smaller than a preset voltage difference value;
and summing the first times and the second times to obtain the times of obtaining the second working current when the water pump motor is in the starting stage.
5. The method according to claim 1, wherein the method further comprises:
When the time length of the water pump motor in the starting stage exceeds a first preset time length, suspending the operation of the water pump motor;
Generating starting fault information and recording the starting fault times;
if the starting failure times are greater than preset times, stopping the operation of the water pump motor;
If the starting failure times are not more than the preset times, setting a second driving current which is more than the first driving current after a second preset time period, and setting a second driving frequency which is less than the first driving frequency; taking the second driving current as a first driving current, taking the second driving frequency as a first driving frequency, re-executing the control to enable the water pump motor to enter a starting stage according to the first driving current and the first driving frequency, and obtaining a first working current of the water pump motor in the starting stage; calculating a motor driving voltage according to the first working current and the first driving current; and calculating normal working voltage according to the first driving frequency, the rated frequency and the rated voltage.
6. The method of claim 1, wherein calculating a motor drive voltage from the first operating current and the first drive current comprises:
acquiring internal setting parameters of the water pump motor;
Substituting the first working current, the first driving current and the internal setting parameters into a motor driving voltage calculation formula to obtain motor driving voltage;
the motor driving voltage calculation formula is as follows:
；
wherein, For the difference between the first driving current and the first operating current obtained at the kth time,/>For the motor drive voltage calculated from the first operating current obtained at the kth time,/>、/>/>Parameters are set for the interior.
7. A start control system for a water pump motor, the system comprising:
the rated parameter acquisition module is used for acquiring rated current, rated voltage and rated frequency of the water pump motor, setting a first driving current larger than the rated current and setting a first driving frequency smaller than the rated frequency;
The working current acquisition module is used for controlling the water pump motor to enter a starting stage according to the first driving current and the first driving frequency and acquiring a first working current of the water pump motor in the starting stage;
the driving voltage calculation module is used for calculating motor driving voltage according to the first working current and the first driving current;
The normal working voltage calculation module is used for calculating normal working voltage according to the first driving frequency, the rated frequency and the rated voltage; and calculating a normal working voltage according to the first driving frequency, the rated frequency and the rated voltage, wherein the normal working voltage comprises the following components: substituting the first driving frequency, the rated frequency and the rated voltage into a normal working voltage calculation formula to obtain a normal working voltage; the normal working voltage calculation formula is as follows: ; wherein/> For the normal operating voltage,/>For the first driving frequency,/>For the nominal frequency,/>Is the rated voltage;
The current judging module is used for judging whether the first working current is smaller than the rated current or not when the time length of the water pump motor in the starting stage is not longer than a first preset time length;
The voltage judging module is used for judging whether the first absolute difference value between the motor driving voltage and the normal working voltage is smaller than a preset voltage difference value or not if the first working current is smaller than the rated current;
and the normal working stage determining module is used for determining that the water pump motor enters a normal working stage if the first absolute difference value is smaller than a preset voltage difference value.
8. A computer storage medium storing a plurality of instructions adapted to be loaded by a processor and to perform the method of any one of claims 1 to 6.
9. An electronic device comprising a processor, a memory and a transceiver, the memory configured to store instructions, the transceiver configured to communicate with other devices, the processor configured to execute the instructions stored in the memory, to cause the electronic device to perform the method of any one of claims 1-6.
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