CN113904303B - Control algorithm of water pump motor protector and water pump motor protector - Google Patents
Control algorithm of water pump motor protector and water pump motor protector Download PDFInfo
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- CN113904303B CN113904303B CN202010575398.7A CN202010575398A CN113904303B CN 113904303 B CN113904303 B CN 113904303B CN 202010575398 A CN202010575398 A CN 202010575398A CN 113904303 B CN113904303 B CN 113904303B
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- temperature
- controlled rectifier
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 230000001012 protector Effects 0.000 title claims abstract description 38
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 50
- 239000010703 silicon Substances 0.000 claims abstract description 50
- 238000002955 isolation Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000003287 optical effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- H02H7/0822—Integrated protection, motor control centres
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention belongs to the technical field of water pumps, and particularly relates to a control algorithm of a water pump motor protector and the water pump motor protector. The invention utilizes the silicon controlled rectifier to control the start and stop of the water pump, thus realizing the soft start function through proper on-off time proportion relation, detecting the temperature of the stator core through the temperature sensor, detecting the current through the current sensor, and calculating the temperature of the coil by utilizing a formula, thereby realizing the over-temperature protection. The invention can realize the over-temperature protection and soft start function besides the conventional over-pressure, under-pressure, over-current protection and the like for the water pump.
Description
Technical Field
The invention belongs to the technical field of water pumps, and particularly relates to a control algorithm of a water pump motor protector and the water pump motor protector.
The background technology is as follows:
in the running process of the electric water pump, various anomalies such as overcurrent, phase loss, overtemperature, overvoltage, undervoltage and the like can occur in the motor, and if a frequency converter is not arranged outside the water pump of the induction motor, the soft start function cannot be realized.
Some water pump protectors are available in the market at present and can realize overvoltage, undervoltage, overcurrent, phase failure protection of a three-phase motor and the like, but do not have over-temperature protection and soft start functions.
In order to realize the over-temperature protection function, the temperature protectors are required to be installed on the coils, but due to the limitation of the coil structure, the temperature protectors are difficult to be installed at proper positions, and if the temperature protectors are required to be installed on each coil, otherwise, when one coil is disconnected due to over-temperature, the other coils are still electrified. Therefore, it is difficult to achieve the over-temperature protection by installing the temperature protector.
The invention comprises the following steps:
the invention aims to provide a control algorithm of a water pump motor protector and the water pump motor protector, which can realize the over-temperature protection and soft start functions besides the conventional protection of overvoltage, undervoltage, overcurrent and the like.
The invention is realized in the following way:
one of the purposes of the invention is to provide a control algorithm of a water pump motor protector, which comprises the following steps:
step one, initializing a singlechip and setting the starting time t of a silicon controlled rectifier 1 Time t of thyristor turn-off 2 Silicon controlled rectifier turn-on increase time t 3 Time t for turning off thyristor 4 Setting value X of cycle times 0 A temperature limit Z;
step two, preprocessing temperature sensor data, and detecting to obtain initial stator core temperature T 0 Zero clearing a timer t and the number of times of circulation X;
step three, detecting a power supply voltage U by a voltage sensor;
step four, detecting the temperature T of the stator core by a temperature sensor n ；
Fifthly, detecting current I by a current sensor;
step six, judging whether to start the water pump, if so, starting to count by a timer t, and continuously executing the step seven; if not, continuing to execute the step ten;
step seven, if the timer t is less than the starting time t of the silicon controlled rectifier 1 Then the silicon controlled rectifier is started; if the thyristor is turned on for a time t 1 The time t is less than or equal to the time t and the time t of the turn-on of the silicon controlled rectifier 1 Time t of turning off of the silicon controlled rectifier 2 Closing the silicon controlled rectifier; if the timer t is more than or equal to the starting time t of the silicon controlled rectifier 1 Time t of turning off of the silicon controlled rectifier 2 Zero clearing the timer t, increasing the cycle number X by 1, and turning on the SCR for a time t 1 Increase to t 1 +t 3 Time t of thyristor off 2 Reduced to t 2 -t 4 Continuing to execute the step eight;
step eight, if the cycle number X is less than the cycle number set value X 0 Returning to the seventh step; if the cycle number X is more than or equal to the cycle number set value X 0 Continuing to execute the step nine;
step nine, completing the starting of the water pump and setting a mark;
step ten, according to formula Y n ＝A*I 2 +B*T n +C*(T n -T n-1 ) Calculating the coil temperature Y n The A, B, C is a constant coefficient inherent to each water pump;
step eleven, judge the coil temperature Y n Whether the temperature is greater than the temperature limit Z or not, if so, continuing to execute the thirteenth step; if not, continuing to execute the step twelve;
step twelve, judging whether one or more of overcurrent, undervoltage and overvoltage exist, if yes, continuing to execute step thirteenth; if not, continuing to execute the step fourteen;
step thirteen, closing the silicon controlled rectifier, and continuously executing step fourteen;
fourteen, returning to the third step.
In the control algorithm of the water pump motor protector, the numerical value of the constant coefficient A, B, C is set by the following method: running water pump and temperature sensor for detecting temperature T of stator core in real time n Coil temperature Y n The current sensor detects a current I; by the formula Y n ＝A*I 2 +B*T n +C*(T n -T n-1 ) The numerical value of the constant coefficient A, B, C is calculated, and the numerical value of the constant coefficient A, B, C is input into the singlechip.
In the control algorithm of the water pump motor protector, the silicon controlled rectifier is turned off for a time t 4 ≥0。
In the control algorithm of the water pump motor protector, the voltage sensor, the temperature sensor and the current sensor are respectively and electrically connected with the singlechip, and the singlechip controls the start and stop of the water pump through the silicon controlled drive circuit.
In the control algorithm of the water pump motor protector, the voltage sensor is a voltage transformer, the current sensor is a current transformer, and the temperature sensor is an NTC thermistor.
In the control algorithm of the water pump motor protector, the NTC thermistor is electrically connected with the ADC interface of the singlechip.
In the control algorithm of the water pump motor protector, the silicon controlled rectifier driving circuit is an optocoupler isolation silicon controlled rectifier driving circuit.
In the control algorithm of the water pump motor protector, three current sensors are arranged to detect three-phase currents respectively.
Another object of the present invention is to provide a water pump motor protector using a control algorithm of the above-mentioned one.
Compared with the prior art, the invention has the following outstanding and beneficial technical effects:
1. the invention can realize the over-temperature protection and soft start function besides the conventional over-pressure, under-pressure, over-current protection and the like for the water pump.
2. The invention can realize soft start without a peripheral frequency converter.
3. The over-temperature protection device does not need to install a temperature protector on the coil, only needs to install a temperature sensor on the stator core, is convenient to install, and can obtain the temperature of the coil through formula conversion.
Description of the drawings:
FIG. 1 is a control flow diagram of the present invention;
FIG. 2 is a soft start operating sequence of the water pump of the present invention;
FIG. 3 is a functional block diagram of the present invention;
fig. 4 is a schematic diagram of the present invention.
The specific embodiment is as follows:
the invention is further described in the following by way of specific embodiments with reference to the accompanying drawings, see fig. 1-4:
one of the purposes of the invention is to provide a control algorithm of a water pump motor protector, which comprises the following steps:
step one, initializing a singlechip IC1 and setting the starting time t of a silicon controlled rectifier 1 Time t of thyristor turn-off 2 Silicon controlled rectifier turn-on increase time t 3 Time t for turning off thyristor 4 Circulation ofSetting value X of times 0 A temperature limit Z;
step two, preprocessing temperature sensor data, and detecting to obtain initial stator core temperature T 0 Zero clearing a timer t and the number of times of circulation X;
step three, detecting a power supply voltage U by a voltage sensor;
step four, detecting the temperature T of the stator core by a temperature sensor n ；
Fifthly, detecting current I by a current sensor;
step six, judging whether to start the water pump, if so, starting to count by a timer t, and continuously executing the step seven; if not, continuing to execute the step ten;
step seven, if the timer t is less than the starting time t of the silicon controlled rectifier 1 Then the silicon controlled rectifier is started; if the thyristor is turned on for a time t 1 The time t is less than or equal to the time t and the time t of the turn-on of the silicon controlled rectifier 1 Time t of turning off of the silicon controlled rectifier 2 Closing the silicon controlled rectifier; if the timer t is more than or equal to the starting time t of the silicon controlled rectifier 1 Time t of turning off of the silicon controlled rectifier 2 Zero clearing the timer t, increasing the cycle number X by 1, and turning on the SCR for a time t 1 Increase to t 1 +t 3 Time t of thyristor off 2 Reduced to t 2 -t 4 Continuing to execute the step eight;
step eight, if the cycle number X is less than the cycle number set value X 0 Returning to the seventh step; if the cycle number X is more than or equal to the cycle number set value X 0 Continuing to execute the step nine;
step nine, completing the starting of the water pump and setting a mark;
step ten, according to formula Y n ＝A*I 2 +B*T n +C*(T n -T n-1 ) Calculating the coil temperature Y n The A, B, C is a constant coefficient inherent to each water pump;
step eleven, judge the coil temperature Y n Whether the temperature is greater than the temperature limit Z or not, if so, continuing to execute the thirteenth step; if not, continuing to execute the step twelve;
step twelve, judging whether one or more of overcurrent, undervoltage and overvoltage exist, if yes, continuing to execute step thirteenth; if not, continuing to execute the step fourteen;
step thirteen, closing the silicon controlled rectifier, and continuously executing step fourteen;
fourteen, returning to the third step.
The value of the constant coefficient A, B, C is set by: running water pump and temperature sensor for detecting temperature T of stator core in real time n Coil temperature Y n The current sensor detects a current I; by the formula Y n ＝A*I 2 +B*T n +C*(T n -T n-1 ) The numerical value of the constant coefficient A, B, C is calculated, the numerical value of the constant coefficient A, B, C obtained through the experiment is suitable for water pumps with the same specification, and the numerical value of the constant coefficient A, B, C is input into the singlechip IC1.
In this embodiment, a number of experimental data are used to calculate the constant coefficients A, B, C to be 0.032, 1.22 and 1.21, respectively, to obtain the formula Y n ＝0.032*I 2 +1.22*T n +1.21*(T n -T n-1 )。
The invention utilizes the silicon controlled rectifier to control the start and stop of the water pump, so that the soft start function can be realized through proper on-off time proportion relation. The on-off time of the soft start of the invention is variable, the on-time t 1 Longer and longer off time t 2 Shorter and shorter or remain unchanged, and transition to full speed operation occurs after a period of time. The on-off time sequence in the starting stage is shown in figure 2, and the high level represents that the silicon controlled rectifier is conducted to enable the motor to operate; the level represents that the thyristor is closed, and the motor stops running. When the water pump is started, if the timer t is less than the starting time t of the silicon controlled rectifier 1 Then the silicon controlled rectifier is started; if the thyristor is turned on for a time t 1 The time t is less than or equal to the time t and the time t of the turn-on of the silicon controlled rectifier 1 Time t of turning off of the silicon controlled rectifier 2 Closing the silicon controlled rectifier; if the timer t is more than or equal to the starting time t of the silicon controlled rectifier 1 Time t of turning off of the silicon controlled rectifier 2 Zero clearing the timer t, increasing the cycle number X by 1, and turning on the SCR for a time t 1 Increase to t 1 +t 3 Time t of thyristor off 2 Reduced to t 2 -t 4 . When the cycle times X is more than or equal to the cycle timesNumber set value X 0 And when the water pump is in soft start, setting a flag, and not executing soft start.
The invention utilizes the voltage sensor to detect the power supply voltage U, and the temperature sensor to detect the temperature T of the stator core n The current sensor detects the current I by the formula Y n ＝A*I 2 +B*T n +C*(T n -T n-1 ) Calculating the coil temperature Y n If the coil temperature Y n If the temperature is larger than the temperature limit value Z, closing the silicon controlled rectifier, and stopping the operation of the motor; if the coil temperature Y n If the temperature is not greater than the temperature limit value Z, whether the current is excessive, the voltage is excessive and the voltage is insufficient is further judged, and if one or more of the current is excessive, the voltage is excessive and the voltage is insufficient, the silicon controlled rectifier is turned off, and the operation of the motor is stopped. The position installation temperature sensor can be easily found on the stator core, and a temperature protector does not need to be installed on the coil.
Overcurrent means that the current I exceeds the rated current or a certain value of the rated current. In this embodiment, overcurrent means that the current I exceeds 50% of the rated current.
Overvoltage means that the supply voltage U exceeds the nominal voltage or a certain value of the nominal voltage. In this embodiment, overvoltage means that the supply voltage U exceeds 20% of the rated voltage.
The undervoltage refers to the fact that the power supply voltage U is smaller than the rated voltage or a certain value of the rated voltage. In this embodiment, overvoltage means that the supply voltage U is less than 20% of the rated voltage.
Further, the SCR turn-off reduction time t 4 Not less than 0, when t 4 When=0, the closing time t 2 Maintaining unchanged; when t 4 At > 0, off time t 2 Shorter and shorter.
As shown in fig. 3, the voltage sensor, the temperature sensor and the current sensor are respectively and electrically connected with the single chip microcomputer IC1, and the single chip microcomputer IC1 controls the start and stop of the water pump through the silicon controlled drive circuit.
Preferably, the voltage sensor is a voltage transformer, the current sensor is a current transformer, and the temperature sensor is an NTC thermistor. The NTC thermistor can detect temperature by means of electron partial pressure.
Because the signal output by the NTC thermistor is an analog quantity, the NTC thermistor is electrically connected with the ADC interface of the singlechip IC1, and the ADC in the singlechip IC1 converts the analog signal into a digital signal.
As shown in fig. 4, the thyristor driving circuit is an optocoupler isolation thyristor driving circuit.
In order to realize open-phase protection, three current sensors are arranged, three-phase currents are detected respectively, open-phase judgment is carried out, and then the single-chip microcomputer ICI carries out open-phase protection on the water pump motor.
In this embodiment, the singlechip IC1 selects ES7P003 (east soft carrier microelectronic product).
Another object of the present invention is to provide a water pump motor protector using a control algorithm of the above-mentioned one.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.
Claims (8)
1. A control algorithm of a water pump motor protector is characterized in that: the method comprises the following steps:
step one, initializing a singlechip and setting the starting time t of a silicon controlled rectifier 1 Time t of thyristor turn-off 2 Silicon controlled rectifier turn-on increase time t 3 Time t for turning off thyristor 4 Setting value X of cycle times 0 A temperature limit Z;
step two, preprocessing temperature sensor data, and detecting to obtain initial stator core temperature T 0 Zero clearing a timer t and the number of times of circulation X;
step three, detecting a power supply voltage U by a voltage sensor;
step four, detecting the temperature T of the stator core by a temperature sensor n ；
Fifthly, detecting current I by a current sensor;
step six, judging whether to start the water pump, if so, starting to count by a timer t, and continuously executing the step seven; if not, continuing to execute the step ten;
step seven, if the timer t is less than the starting time t of the silicon controlled rectifier 1 Then the silicon controlled rectifier is started; if the thyristor is turned on for a time t 1 The time t is less than or equal to the time t and the time t of the turn-on of the silicon controlled rectifier 1 Time t of turning off of the silicon controlled rectifier 2 Closing the silicon controlled rectifier; if the timer t is more than or equal to the starting time t of the silicon controlled rectifier 1 Time t of turning off of the silicon controlled rectifier 2 Zero clearing the timer t, increasing the cycle number X by 1, and turning on the SCR for a time t 1 Increase to t 1 +t 3 Time t of thyristor off 2 Reduced to t 2 -t 4 Continuing to execute the step eight;
step eight, if the cycle number X is less than the cycle number set value X 0 Returning to the seventh step; if the cycle number X is more than or equal to the cycle number set value X 0 Continuing to execute the step nine;
step nine, completing the starting of the water pump and setting a mark;
step ten, according to formula Y n ＝A*I 2 +B*T n +C*(T n -T n-1 ) Calculating the coil temperature Y n The A, B, C is a constant coefficient inherent to each water pump;
step eleven, judge the coil temperature Y n Whether the temperature is greater than the temperature limit Z or not, if so, continuing to execute the thirteenth step; if not, continuing to execute the step twelve;
step twelve, judging whether one or more of overcurrent, undervoltage and overvoltage exist, if yes, continuing to execute step thirteenth; if not, continuing to execute the step fourteen;
step thirteen, closing the silicon controlled rectifier, and continuously executing step fourteen;
fourteen, returning to the third step;
the value of the constant coefficient A, B, C is set by:
running water pump and temperature sensor for detecting temperature T of stator core in real time n Coil temperature Y n The current sensor detects a current I; by the formula Y n ＝A*I 2 +B*T n +C*(T n -T n-1 ) The numerical value of the constant coefficient A, B, C is calculated, and the numerical value of the constant coefficient A, B, C is input into the singlechip.
2. The control algorithm of the water pump motor protector according to claim 1, wherein: the thyristor off reduction time t 4 ≥0。
3. The control algorithm of the water pump motor protector according to claim 1, wherein: the voltage sensor, the temperature sensor and the current sensor are respectively and electrically connected with the singlechip, and the singlechip controls the start and stop of the water pump through the silicon controlled rectifier driving circuit.
4. A control algorithm for a water pump motor protector according to claim 3, wherein: the voltage sensor is a voltage transformer, the current sensor is a current transformer, and the temperature sensor is an NTC thermistor.
5. The control algorithm of the water pump motor protector according to claim 4, wherein: the NTC thermistor is electrically connected with an ADC interface of the singlechip.
6. A control algorithm for a water pump motor protector according to claim 3, wherein: the silicon controlled drive circuit is an optical coupling isolation silicon controlled drive circuit.
7. A control algorithm for a water pump motor protector according to claim 3, wherein: the three current sensors are arranged to detect three-phase currents respectively.
8. A water pump motor protector which characterized in that: the water pump motor protector uses a control algorithm of the water pump motor protector according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010575398.7A CN113904303B (en) | 2020-06-22 | 2020-06-22 | Control algorithm of water pump motor protector and water pump motor protector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010575398.7A CN113904303B (en) | 2020-06-22 | 2020-06-22 | Control algorithm of water pump motor protector and water pump motor protector |
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| Publication Number | Publication Date |
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| CN113904303A CN113904303A (en) | 2022-01-07 |
| CN113904303B true CN113904303B (en) | 2024-04-16 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0677469U (en) * | 1993-04-12 | 1994-10-28 | 三和機材株式会社 | Motor protector |
| CN1202035A (en) * | 1997-06-05 | 1998-12-16 | 佐藤宏仁 | Method of and apparatus for starting AC electric motor |
| KR19990041601U (en) * | 1998-05-22 | 1999-12-15 | 윤홍구 | Water detector of water purifier |
| CN102623959A (en) * | 2012-03-28 | 2012-08-01 | 彭勇 | Intelligent protector for electric water pump |
| CN103178660A (en) * | 2013-03-26 | 2013-06-26 | 奇瑞汽车股份有限公司 | Driving motor with easily maintained temperature sensor and over-temperature protection method for driving motor |
-
2020
- 2020-06-22 CN CN202010575398.7A patent/CN113904303B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0677469U (en) * | 1993-04-12 | 1994-10-28 | 三和機材株式会社 | Motor protector |
| CN1202035A (en) * | 1997-06-05 | 1998-12-16 | 佐藤宏仁 | Method of and apparatus for starting AC electric motor |
| KR19990041601U (en) * | 1998-05-22 | 1999-12-15 | 윤홍구 | Water detector of water purifier |
| CN102623959A (en) * | 2012-03-28 | 2012-08-01 | 彭勇 | Intelligent protector for electric water pump |
| CN103178660A (en) * | 2013-03-26 | 2013-06-26 | 奇瑞汽车股份有限公司 | Driving motor with easily maintained temperature sensor and over-temperature protection method for driving motor |
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| CN113904303A (en) | 2022-01-07 |
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