CN115681113A - Control system for deep well pump and control method thereof - Google Patents
Control system for deep well pump and control method thereof Download PDFInfo
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- CN115681113A CN115681113A CN202211365627.8A CN202211365627A CN115681113A CN 115681113 A CN115681113 A CN 115681113A CN 202211365627 A CN202211365627 A CN 202211365627A CN 115681113 A CN115681113 A CN 115681113A
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Abstract
The invention discloses a control system for a deep well pump and a control method thereof, wherein the control method comprises the following steps: controlling a motor of the deep-well pump to start, and sampling voltage/current; after the motor is started, calculating the output power of the motor according to the sampling result, if the power is greater than a preset power threshold value, controlling the motor to run at constant power, otherwise, controlling the motor to run at constant rotating speed; in the running process of the motor, calculating the load of the motor to judge whether the running environment of the motor is lack of water, if so, controlling the motor to pause working within a preset first time threshold, and adding 1 to a water shortage counting value; and if the water shortage count value reaches the preset time threshold value within the preset second time threshold value, controlling the motor to stop within a preset third time threshold value, and clearing the water shortage count value, wherein the third time threshold value is larger than the first time threshold value. The control system of the invention adopts a modular structural design, is convenient for flexible distribution to reduce the whole volume of the deep-well pump, and has safe and reliable control logic.
Description
Technical Field
The invention relates to the field of deep well pump control, in particular to a control system for a deep well pump and a control method thereof.
Background
The deep well pump is a power machine which is sunk into the well hole to suck and convey underground water, and is characterized by that the motor and pump are made into one body. Conventional deep well pumps are bulky, in part because of the large master volume of the motor.
On the other hand, in the conventional deep well pump, the control of the safe operation of the motor is very small, resulting in a phenomenon that the motor is damaged in the working process.
The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application nor give technical teaching; the above background should not be used to assess the novelty or inventiveness of the present application in the event that there is no clear evidence that the above disclosure has been made prior to the filing date of the present patent application.
Disclosure of Invention
The invention aims to provide a safe and reliable control system for a deep well pump and a control method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a control system for a deep well pump comprises a modularized power supply module, a main control module and a driving module, wherein the power supply module is configured to provide electric energy for the main control module, the main control module is connected with the driving module, and the driving module is configured to be connected with a motor of the deep well pump and adjust working parameters of the motor under the control of the main control module;
the main control module is configured with a voltage sampling circuit and a current sampling circuit, and is configured to control the driving module according to a voltage sampling result and a current sampling result of the motor:
after the motor is started, calculating the output power of the motor according to the sampling result, if the output power is greater than a preset power threshold, controlling the motor to operate in a mode of keeping constant at the power threshold, otherwise, controlling the motor to operate in a mode of keeping constant at a preset rotating speed threshold;
in the running process of the motor, calculating the load of the motor to judge whether the running environment of the motor is lack of water, if so, controlling the motor to pause working within a preset first time threshold, and adding 1 to a water shortage count value; and if the water shortage count value reaches the preset time threshold value within the preset second time threshold value, controlling the motor to stop within a preset third time threshold value, and clearing the water shortage count value, wherein the third time threshold value is larger than the first time threshold value.
Further, in view of any one or a combination of the foregoing technical solutions, the manner of determining whether the operating environment of the motor is deficient in water is as follows:
and calculating the real-time load torque of the motor according to the output power and the rotating speed of the motor, and if the real-time load torque is smaller than the preset proportion of the rated load torque and continues for a preset fourth time threshold, judging that the running environment of the motor is lack of water.
Further, in view of any one or a combination of the foregoing technical solutions, if it is determined that the operating environment of the motor is not deficient in water, further determining:
if the bus voltage of the motor is less than 150VAC, controlling the driving module to perform undervoltage protection on the motor, and juxtaposing a motor fault mark; and/or the presence of a gas in the atmosphere,
if the bus voltage of the motor is greater than 260VAC, controlling the driving module to perform overvoltage protection on the motor, and setting a motor fault mark; and/or the presence of a gas in the gas,
and if the current sampling result of the motor exceeds a preset overcurrent threshold, controlling the driving module to perform overcurrent protection on the motor and setting a motor fault mark.
Further, in view of any one or a combination of the foregoing technical solutions, if it is determined that the operating environment of the motor is not deficient in water, further determining:
and if the rotating speed of the motor is lower than 50rpm or the current sampling result of the motor is more than 5 times of the rated current, controlling the driving module to execute locked rotor protection on the motor and setting a motor fault mark.
Further, in accordance with any one or combination of multiple previous claims, the driving module is configured with an IPM and/or an IGBT, the main control module is configured with a temperature sampling circuit, and the main control module is configured to control the driving module according to a temperature sampling result of the IPM and/or the IGBT:
if the running environment of the motor is judged not to be lack of water, further judgment is carried out:
if the temperature sampling result of the IPM and/or the IGBT is larger than a first temperature threshold value, controlling the driving module to execute over-temperature protection on the motor and setting a motor fault sign; and if the temperature sampling result of the IPM and/or the IGBT is smaller than the first temperature threshold and larger than the second temperature threshold, controlling the driving module to adjust the motor to run at a reduced speed, and returning to the step of judging whether the running environment of the motor is lack of water.
Further, in accordance with any one or combination of the preceding claims, the motor fault flag is configured to be deactivated when the motor is powered up again after a power failure.
Further, in accordance with any one or a combination of the above technical solutions, the motor is a brushless motor.
According to another aspect of the present invention, there is provided a deep-well pump motor control method comprising the steps of:
controlling a motor of the deep-well pump to start, and carrying out voltage sampling and current sampling on the motor;
after the motor is started, calculating the output power of the motor according to the sampling result, if the output power is greater than a preset power threshold, controlling the motor to operate in a mode of keeping constant at the power threshold, otherwise, controlling the motor to operate in a mode of keeping constant at a preset rotating speed threshold;
in the running process of the motor, calculating the load of the motor to judge whether the running environment of the motor is lack of water, if so, controlling the motor to pause working within a preset first time threshold, and adding 1 to a water shortage count value; and if the water shortage count value reaches the preset time threshold value within the preset second time threshold value, controlling the motor to stop within a preset third time threshold value, and clearing the water shortage count value, wherein the third time threshold value is larger than the first time threshold value.
Further, in view of any one or a combination of the foregoing technical solutions, if it is determined that the operating environment of the motor is not deficient in water, further determining:
if the bus voltage of the motor is less than 150VAC, performing undervoltage protection on the motor, and setting a motor fault mark; and/or the presence of a gas in the gas,
if the bus voltage of the motor is greater than 260VAC, performing overvoltage protection on the motor, and setting a motor fault mark; and/or the presence of a gas in the atmosphere,
if the current sampling result of the motor exceeds a preset overcurrent threshold, performing overcurrent protection on the motor, and setting a motor fault mark; and/or the presence of a gas in the gas,
if the rotating speed of the motor is lower than 50rpm or the current sampling result of the motor is greater than 5 times of the rated current, locked-rotor protection is carried out on the motor, and a motor fault mark is set; and/or the presence of a gas in the gas,
sampling the temperature of an IPM chip of the motor, and if the temperature sampling result of the IPM chip is greater than a first temperature threshold value, performing over-temperature protection on the motor and setting a motor fault sign; if the temperature sampling result of the IPM chip is smaller than the first temperature threshold and larger than the second temperature threshold, controlling the motor to run at a reduced speed, and returning to the step of judging whether the running environment of the motor is lack of water;
wherein the motor fault flag is configured to be deactivated when the motor is powered up again after power is removed from the motor.
Further, in accordance with any one or a combination of the preceding claims, the starting process of the motor includes:
judging whether a motor fault mark exists or not, if not, and receiving a starting instruction of the motor, sequentially executing open-loop operation and closed-loop operation, and finishing slow start within a preset fifth time threshold;
if the bus voltage of the motor is 150VAC to 260VAC, the current sampling result of the motor is lower than a preset overcurrent threshold value, the motor is not locked, and the temperature sampling result of the IPM chip is smaller than a second temperature threshold value, judging whether a shutdown instruction exists, if so, controlling the motor to decelerate and stop, otherwise, returning to the step of judging whether the running environment of the motor is water-deficient.
The technical scheme provided by the invention has the following beneficial effects:
a. the control system for the deep well pump adopts a modular structure to design the power module, the main control module and the driving module, so that the whole structure is simple, and the flexible distribution is convenient to reduce the whole volume of the deep well pump;
b. except for water shortage protection, other error detections generate fault marks, and the faults can be relieved only by powering off and on again, so that the water shortage protection device is safe and reliable.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic circuit diagram of a power module provided in an exemplary embodiment of the invention;
fig. 2 is a schematic diagram of a master control module according to an exemplary embodiment of the present invention;
fig. 3 is a circuit schematic diagram of a driving module according to an exemplary embodiment of the present invention;
FIG. 4 is a schematic diagram of a voltage sampling circuit provided in an exemplary embodiment of the invention;
FIG. 5 is a schematic diagram of a temperature sampling circuit provided in an exemplary embodiment of the present invention;
FIG. 6 is a basic flow diagram of a deep well pump motor control method provided by an exemplary embodiment of the present invention;
FIG. 7 is a detailed flow chart of a motor control method provided in an exemplary embodiment of the present invention;
FIG. 8 is a schematic diagram of a main flow of motor control provided by an exemplary embodiment of the present invention;
FIG. 9 is a block initialization flow diagram provided in accordance with an exemplary embodiment of the present invention;
FIG. 10 is a schematic illustration of an interrupt flow provided by an exemplary embodiment of the present invention;
fig. 11 is a schematic diagram of an ADC interrupt flow in an interrupt flow provided by an exemplary embodiment of the present invention;
fig. 12 is a schematic diagram of a system clock sysstick interrupt flow in an interrupt flow according to an exemplary embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
In an embodiment of the present invention, a control system for a deep well pump is provided, including a modular power module, a main control module, and a driving module, where the power module is shown in fig. 1, the main control module is shown in fig. 2, and the driving module is shown in fig. 3, where the power module is configured to provide electric energy to the main control module; the main control module is connected with the driving module, the driving module is configured to be connected with a motor of the deep-well pump, the motor in the embodiment is a brushless motor, and working parameters of the motor are adjusted under the control of the main control module;
the main control module is configured with a voltage sampling circuit (as shown in fig. 4) and a current sampling circuit, and is configured to control the driving module according to a voltage sampling result and a current sampling result of the motor, in a manner shown in fig. 6:
after the motor is started, calculating the output power of the motor according to the sampling result, if the output power is greater than a preset power threshold (such as 1500W to 1800W), controlling the motor to operate in a mode of keeping constant at the power threshold, otherwise, controlling the motor to operate in a mode of keeping constant at a preset rotating speed threshold (such as 4000rpm to 7500 rpm);
in the running process of the motor, calculating the load of the motor to judge whether the running environment of the motor is water-deficient or not, wherein the mode of judging whether the running environment of the motor is water-deficient or not is as follows: calculating the real-time load torque of the motor according to the output power and the rotating speed of the motor, wherein the calculation formula is as follows: t = P/w = P/(2 pi/60) =9550P/N, where T is the load torque of the motor, and the unit is N × m; p is the output power of the motor, and the unit is watt; w is angular velocity, in rad/s; and n is the motor rotating speed and has the unit of m/s. In a specific embodiment, if the time that the real-time load torque is less than 60% of the rated load torque lasts for 10s, it is determined that the operating environment of the motor is water-deficient. If the running environment of the motor is judged to be lack of water, controlling the motor to pause within a preset first time threshold (such as 30 s-3 minutes), and adding 1 to a water shortage count value; if the water shortage count value reaches a preset number threshold (for example, 6 to 15 times) within a preset second time threshold (for example, 15 to 30 minutes), controlling the motor to stop within a preset third time threshold (for example, 3 to 5 hours), clearing the water shortage count value, and also clearing the water shortage count value or deleting the count that the time of adding 1 in the water shortage count value exceeds the second time threshold from the current time (counting the water shortage count value within the latest second time threshold all the time).
If the operating environment of the motor is judged not to be lack of water, as shown in fig. 7, further judgment is carried out:
if the bus voltage of the motor is less than 150VAC, controlling the driving module to execute undervoltage protection on the motor, and setting a motor fault mark;
if the bus voltage of the motor is greater than 260VAC, controlling the driving module to perform overvoltage protection on the motor, and setting a motor fault mark;
if the current sampling result of the motor exceeds a preset overcurrent threshold, controlling the driving module to perform overcurrent protection on the motor and setting a motor fault mark;
if the rotating speed of the motor is lower than 50rpm or the current sampling result of the motor is greater than 5 times of the rated current, controlling the driving module to execute locked rotor protection on the motor and setting a motor fault mark;
the drive module is configured with IPM and/or IGBT, the main control module is configured with a temperature sampling circuit (as shown in FIG. 5), and the main control module is configured to control the drive module according to the temperature sampling result of the IPM and/or IGBT: if the running environment of the motor is judged not to be lack of water, further judgment is carried out: if the temperature sampling result of the IPM and/or the IGBT is larger than a first temperature threshold (for example, 90-110 ℃), controlling the driving module to execute over-temperature protection on the motor, and setting a motor fault mark; and if the temperature sampling result of the IPM and/or the IGBT is smaller than a first temperature threshold and larger than a second temperature threshold (for example, 70-89 ℃), controlling the driving module to regulate the motor to run at a reduced speed, and returning to the step of judging whether the running environment of the motor is lack of water.
Under-voltage protection, overvoltage protection, overcurrent protection, locked rotor protection, overheat protection all can for example through relay protection equipment or the device of similar function, cut off the circuit to ensure that device equipment on the whole return circuit can not burn out, realize the protection to the motor.
The motor fault flag is configured to be deactivated when the motor is powered up again after being powered down.
According to another aspect of the present invention, there is provided a deep-well pump motor control method, as shown in fig. 6, comprising the steps of:
controlling a motor of a deep-well pump to start, and carrying out voltage sampling and current sampling on the motor;
after the motor is started, calculating the output power of the motor according to the sampling result, if the output power is greater than a preset power threshold, controlling the motor to operate in a mode of being constant at the power threshold, otherwise, controlling the motor to operate in a mode of being constant at a preset rotating speed threshold;
in the running process of the motor, calculating the load of the motor to judge whether the running environment of the motor is lack of water, if so, controlling the motor to pause working within a preset first time threshold, and adding 1 to a water shortage count value; and if the water shortage count value reaches the preset time threshold value within the preset second time threshold value, controlling the motor to stop within a preset third time threshold value, and clearing the water shortage count value, wherein the third time threshold value is larger than the first time threshold value.
In one embodiment of the present invention, the starting process of the motor includes:
judging whether a motor fault mark exists or not, if not, and receiving a starting instruction of the motor, sequentially executing open-loop operation and closed-loop operation, and finishing slow start within 10 s;
after the motor is started, calculating the output power of the motor according to the sampling result, namely calculating the product of sampling voltage and sampling current, if the output power is more than 1700W, controlling the motor to operate at constant power of 1700W, otherwise, controlling the motor to operate at a constant rotating speed of 4500 rpm;
in the running process of the motor, calculating the load of the motor (the calculation mode is not repeated) to judge whether the running environment of the motor is lack of water, if so, controlling the motor to pause for 1 minute, and adding 1 to a water shortage counting value; and if the water shortage count value reaches 10 times in 20 minutes, controlling the motor to stop for 4 hours, and clearing the water shortage count value.
If the running environment of the motor is judged not to be lack of water, further judgment is carried out:
if the bus voltage of the motor is less than 150VAC, performing undervoltage protection on the motor, and setting a motor fault mark;
if the bus voltage of the motor is greater than 260VAC, performing overvoltage protection on the motor, and setting a motor fault mark;
if the current sampling result of the motor exceeds a preset overcurrent threshold, performing overcurrent protection on the motor, and setting a motor fault mark;
if the rotating speed of the motor is lower than 50rpm or the current sampling result of the motor is more than 5 times of the rated current, locked-rotor protection is carried out on the motor, and a motor fault mark is set;
sampling the temperature of an IPM chip of the motor, and if the temperature sampling result of the IPM chip is more than 100 ℃, performing over-temperature protection on the motor and juxtaposing a motor fault mark; if the temperature sampling result of the IPM chip is less than 100 ℃ and more than 80 ℃, controlling the motor to run at a reduced speed, and returning to the step of judging whether the running environment of the motor is water-deficient;
wherein the motor fault flag is configured to be deactivated when the motor is powered up again after power is removed from the motor.
On the contrary, if the bus voltage of the motor is 150VAC to 260VAC, the current sampling result of the motor is lower than the preset overcurrent threshold, the motor is not locked, and the temperature sampling result of the IPM chip is smaller than the second temperature threshold, determining whether a shutdown instruction exists, if so, controlling the motor to decelerate and stop, otherwise, returning to the step of determining whether the running environment of the motor is water-deficient, as shown in fig. 7.
Besides the above-mentioned motor running main state machine and error detection flow, the method also includes the flow of initialization and interrupt program execution, the main flow is shown in fig. 8, the module initialization flow is shown in fig. 9, the interrupt flow is shown in fig. 10, the flow of ADC interrupt (FOC algorithm execution) in the interrupt flow is shown in fig. 11, and the system clock sysstick interrupt flow in the interrupt flow is shown in fig. 12. In summary, the control system is initialized after being powered on, including module initialization (GPIO, timer, ADC, op-amp, comparator, etc.), variable initialization, and state machine initialization. After initialization is completed, all programs are executed in interruption, and timer interruption is used for generating PWM; ADC interrupt frequency is 10-20 khz, and FOC control algorithm is executed; the system clock Systick interrupts frequency 1khz, and executes a motor operation main state machine and error detection, wherein the motor operation main state machine and error detection process comprises motor starting, stopping, constant power control/constant rotating speed control and error detection, and the error detection comprises water shortage detection, overvoltage protection, undervoltage protection, overcurrent protection, locked rotor protection, operation water shortage protection and over-temperature protection (the short circuit protection has high real-time requirement and is executed in interruption). The water shortage detection principle is that if the continuous 10s load is less than 60% of the rated load, water shortage is considered, and the corresponding control strategy is to stop the machine for 1 minute and then start the machine; if more than 10 times of water shortage is detected within 20 minutes, stopping the machine for 4 hours and then starting the machine; the over-temperature protection is divided into two grades, the speed is reduced when the IPM temperature is more than 80 ℃ but less than 100 ℃, and the machine is stopped for protection when the IPM temperature is more than 100 ℃. Except for water shortage protection, other protections generate fault signs, and the fault can be relieved only by powering off and on.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (10)
1. A control system for a deep well pump is characterized by comprising a modularized power supply module, a main control module and a driving module, wherein the power supply module is configured to provide electric energy for the main control module, the main control module is connected with the driving module, the driving module is configured to be connected with a motor of the deep well pump, and the working parameters of the motor are adjusted under the control of the main control module;
the main control module is configured with a voltage sampling circuit and a current sampling circuit, and is configured to control the driving module according to a voltage sampling result and a current sampling result of the motor:
after the motor is started, calculating the output power of the motor according to the sampling result, if the output power is greater than a preset power threshold, controlling the motor to operate in a mode of being constant at the power threshold, otherwise, controlling the motor to operate in a mode of being constant at a preset rotating speed threshold;
in the running process of the motor, calculating the load of the motor to judge whether the running environment of the motor is lack of water, if so, controlling the motor to pause working within a preset first time threshold, and adding 1 to a water shortage count value; and if the water shortage count value reaches the preset time threshold value within the preset second time threshold value, controlling the motor to stop within the preset third time threshold value, and clearing the water shortage count value, wherein the third time threshold value is larger than the first time threshold value.
2. The control system for the deep well pump according to claim 1, wherein the manner of judging whether the operating environment of the motor is deficient in water is:
and calculating the real-time load torque of the motor according to the output power and the rotating speed of the motor, and if the time of the real-time load torque being less than the preset proportion of the rated load torque lasts for a preset fourth time threshold, judging that the running environment of the motor is lack of water.
3. The control system for the deep well pump according to claim 1, wherein if it is determined that the operating environment of the motor is not deficient in water, it is further determined that:
if the bus voltage of the motor is less than 150VAC, controlling the driving module to perform undervoltage protection on the motor, and juxtaposing a motor fault mark; and/or the presence of a gas in the atmosphere,
if the bus voltage of the motor is greater than 260VAC, controlling the driving module to perform overvoltage protection on the motor, and setting a motor fault mark; and/or the presence of a gas in the atmosphere,
and if the current sampling result of the motor exceeds a preset overcurrent threshold, controlling the driving module to perform overcurrent protection on the motor and setting a motor fault mark.
4. The control system for the deep well pump according to claim 1, wherein if it is determined that the operating environment of the motor is not deficient in water, it is further determined that:
and if the rotating speed of the motor is lower than 50rpm or the current sampling result of the motor is greater than 5 times of the rated current, controlling the driving module to execute locked-rotor protection on the motor and setting a motor fault mark.
5. The control system for a deep well pump according to claim 1, wherein the drive module is configured with an IPM and/or an IGBT, the main control module is configured with a temperature sampling circuit, and the main control module is configured to control the drive module according to a result of the temperature sampling of the IPM and/or the IGBT:
if the running environment of the motor is judged not to be lack of water, further judgment is carried out:
if the temperature sampling result of the IPM and/or the IGBT is larger than a first temperature threshold value, controlling the driving module to execute over-temperature protection on the motor, and setting a motor fault sign; and if the temperature sampling result of the IPM and/or the IGBT is smaller than the first temperature threshold and larger than the second temperature threshold, controlling the driving module to adjust the motor to run at a reduced speed, and returning to the step of judging whether the running environment of the motor is lack of water.
6. The control system for a deep well pump according to any one of claims 3 to 5, wherein the motor failure flag is configured to be released when the motor is powered up again after power failure.
7. The control system for a deep well pump according to any one of claims 1 to 5, wherein the motor is a brushless motor.
8. A deep-well pump motor control method is characterized by comprising the following steps:
controlling a motor of the deep-well pump to start, and carrying out voltage sampling and current sampling on the motor;
after the motor is started, calculating the output power of the motor according to the sampling result, if the output power is greater than a preset power threshold, controlling the motor to operate in a mode of being constant at the power threshold, otherwise, controlling the motor to operate in a mode of being constant at a preset rotating speed threshold;
in the running process of the motor, calculating the load of the motor to judge whether the running environment of the motor is lack of water, if so, controlling the motor to pause working within a preset first time threshold, and adding 1 to a water shortage count value; and if the water shortage count value reaches the preset time threshold value within the preset second time threshold value, controlling the motor to stop within the preset third time threshold value, and clearing the water shortage count value, wherein the third time threshold value is larger than the first time threshold value.
9. The deep-well pump motor control method of claim 8, wherein if it is determined that the operating environment of the motor is not deficient in water, further determining:
if the bus voltage of the motor is less than 150VAC, performing undervoltage protection on the motor, and setting a motor fault mark; and/or the presence of a gas in the gas,
if the bus voltage of the motor is greater than 260VAC, performing overvoltage protection on the motor, and setting a motor fault mark; and/or the presence of a gas in the gas,
if the current sampling result of the motor exceeds a preset overcurrent threshold, performing overcurrent protection on the motor, and setting a motor fault mark; and/or the presence of a gas in the gas,
if the rotating speed of the motor is lower than 50rpm or the current sampling result of the motor is more than 5 times of the rated current, locked-rotor protection is carried out on the motor, and a motor fault mark is set; and/or the presence of a gas in the gas,
sampling the temperature of an IPM chip of the motor, and if the temperature sampling result of the IPM chip is greater than a first temperature threshold value, performing over-temperature protection on the motor and setting a motor fault sign; if the temperature sampling result of the IPM chip is smaller than a first temperature threshold and larger than a second temperature threshold, controlling the motor to run at a reduced speed, and returning to the step of judging whether the running environment of the motor is lack of water;
wherein the motor fault flag is configured to be deactivated when the motor is powered up again after power is removed from the motor.
10. The deep-well pump motor control method of claim 9, wherein the starting process of the motor comprises:
judging whether a motor fault mark exists or not, if not, receiving a starting instruction of the motor, sequentially executing open-loop operation and closed-loop operation, and finishing slow start within a preset fifth time threshold;
if the bus voltage of the motor is 150 VAC-260 VAC, the current sampling result of the motor is lower than a preset overcurrent threshold value, the motor is not locked, and the temperature sampling result of the IPM chip is smaller than a second temperature threshold value, judging whether a shutdown instruction exists, if so, controlling the motor to decelerate and stop, and if not, returning to the step of judging whether the running environment of the motor is lack of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211365627.8A CN115681113A (en) | 2022-10-31 | 2022-10-31 | Control system for deep well pump and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211365627.8A CN115681113A (en) | 2022-10-31 | 2022-10-31 | Control system for deep well pump and control method thereof |
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| CN115681113A true CN115681113A (en) | 2023-02-03 |
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| CN202211365627.8A Pending CN115681113A (en) | 2022-10-31 | 2022-10-31 | Control system for deep well pump and control method thereof |
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2022
- 2022-10-31 CN CN202211365627.8A patent/CN115681113A/en active Pending
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