CN117074803A - Method and device for detecting phase sequence of compressor - Google Patents
Method and device for detecting phase sequence of compressor Download PDFInfo
- Publication number
- CN117074803A CN117074803A CN202311163563.8A CN202311163563A CN117074803A CN 117074803 A CN117074803 A CN 117074803A CN 202311163563 A CN202311163563 A CN 202311163563A CN 117074803 A CN117074803 A CN 117074803A
- Authority
- CN
- China
- Prior art keywords
- phase
- compressor
- electromotive force
- voltage
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000819 phase cycle Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005070 sampling Methods 0.000 claims description 63
- 238000001514 detection method Methods 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The application discloses a method and a device for detecting phase sequence of a compressor, wherein the method comprises the following steps: collecting three-phase current and three-phase voltage of the input side of the compressor; calculating back electromotive force differences of three phases according to the three-phase currents and the three-phase voltages; if the maximum value of the back electromotive force differences among the three phases is greater than or equal to a reference threshold value, judging phase sequence errors and generating a fault prompting signal, the method and the device can solve the problems that in the prior art, after terminal phase sequences are manually distinguished, the controller and the compressor are connected, phase sequence errors are easy to occur, and the compressor is damaged after inversion.
Description
Technical Field
The application relates to the technical field of compressors, in particular to a method and a device for detecting phase sequence of a compressor.
Background
The compressor is one of the main components in a refrigeration air conditioning or heat pump system. The rotation direction of the compressor is critical, and the error of the rotation direction can lead to opposite suction and exhaust directions, and the compressor can be damaged even if the compressor cannot work normally. In practical application, the variable-frequency compressor is generally controlled by a special controller, and the output end of the controller is marked with three-phase sequence identifiers U, V and W; meanwhile, the terminals of the compressor are also marked with corresponding phase sequence identifiers U, V and W, and the output end of the controller is correspondingly connected with the phase sequence ports of the terminals of the compressor through wires, namely U-U, V-V and W-W are correspondingly connected, so that the controller operates the output signals according to the U-V-W sequence.
At present, the connection mode is that wires are used for connection after the phase sequence of the terminals is manually distinguished, and the situation that the phase sequence is misplaced in the process to cause damage after the compressor is reversely rotated is avoided.
In the related art, there is a technical scheme that whether the operation data of the compressor is wrong or not is judged according to the temperature parameter by collecting the temperature parameter, and then whether phase sequence misconnection occurs or not is judged. However, the temperature is accumulated for a long time, and the damage of the compressor may occur.
Disclosure of Invention
The application aims to overcome the defects of the prior art, and provides a method and a device for detecting the phase sequence of a compressor, which are used for solving the problems that the controller and the compressor are connected after the phase sequence of a terminal is manually distinguished in the prior art, the phase sequence is easy to be misplaced, and the compressor is damaged after being reversed.
In order to achieve the technical purpose, the application adopts the following technical scheme:
according to an aspect of the present application, there is provided a compressor phase sequence detection method including:
collecting three-phase current and three-phase voltage of the input side of the compressor;
calculating back electromotive force differences of three phases according to the three-phase currents and the three-phase voltages;
and if the maximum value of the back electromotive force differences among the three phases is greater than or equal to a reference threshold value, judging that the phase sequence is connected with errors, and generating a fault prompting signal.
Optionally, the calculating the back electromotive force difference between the three phases according to the three-phase current and the three-phase voltage includes:
for any two-phase line, the back emf difference between the two phases is calculated as follows:
multiplying the stator phase resistance of the compressor by the difference between the stator phase current of the second phase and the stator phase current of the first phase to obtain a first potential term;
multiplying the effective inductance of the stator of the compressor by the instantaneous difference between the stator phase current of the second phase and the stator phase current of the first phase to obtain a second potential term;
and adding the first potential item and the second potential item, and subtracting the line voltage between the second phase and the third phase and the line voltage between the third phase and the first phase to obtain the counter electromotive force difference between the first phase and the second phase.
Optionally, if the maximum value of the back emf differences between the three phases is greater than or equal to a reference threshold, the method further comprises: and sending a shutdown instruction to the compressor.
Optionally, the method further comprises:
after the compressor is started, detecting whether the current running frequency of the compressor reaches a preset frequency, if so, calculating the back electromotive force difference between the three phases according to the three-phase current and the three-phase voltage.
Optionally, the reference threshold is determined according to the following manner:
measuring the maximum value of the back electromotive force between the first three phases when the phase sequence of the compressor is correctly connected;
measuring the maximum value of the back electromotive force between the second three phases when the phase sequence of the compressor is connected in error;
and determining the reference threshold according to the first three-phase counter electromotive force maximum value and the second three-phase counter electromotive force maximum value.
Optionally, the method further comprises:
continuously comparing the maximum value of the three-phase counter electromotive force differences with the reference threshold value within a preset time;
and if the maximum value of the back electromotive force differences among the three phases is still smaller than the reference threshold value when the preset time is cut off, controlling the compressor to normally operate.
Optionally, the predetermined time is determined by the following criteria: and in the preset time, the detected three-phase counter electromotive force difference of the compressor can be enough to reach the reference threshold value, and in the preset time, the compressor is not damaged if the phase sequence of the compressor is misplaced.
According to another aspect of the present application, there is also provided a phase sequence detecting apparatus for a compressor, including
The sampling unit is used for collecting three-phase current and three-phase voltage at the input side of the compressor;
the control unit is connected with the sampling unit and is used for calculating back electromotive force difference between three phases according to the three-phase current and the three-phase voltage; and if the maximum value of the back electromotive force differences among the three phases is greater than or equal to a reference threshold value, judging that the phase sequence is connected with errors, and generating a fault prompting signal.
Optionally, the method comprises the following steps: the sampling unit comprises a current sampling circuit; the current sampling circuit comprises a three-phase sampling end and a reference ground end; the sampling end is connected with the non-inverting input end of the operational amplifier chip through a first resistor; the reference ground end is connected with the inverting input end of the operational amplifier chip through a second resistor; the output end of the operational amplifier chip is connected to the control unit; and the inverting input end of the operational amplifier chip is also connected with the output end of the operational amplifier chip through a third resistor.
Optionally, a bias circuit for biasing the negative half-shaft current to the positive half-shaft is further connected to a node between the first resistor and the non-inverting input end of the op-amp chip.
Optionally, the adoption unit comprises a voltage sampling circuit, and the voltage sampling circuit comprises a three-phase sampling end and a signal output end; the three-phase sampling end is grounded through at least two voltage dividing resistors, and two ends of the voltage dividing resistor close to the ground are connected with the signal output end through a filter circuit and connected to the control unit through the signal output end.
Optionally, a voltage limiting circuit is further connected between the signal output end and the voltage dividing resistor connected with the signal output end, and when the voltage value of the voltage dividing resistor exceeds a threshold value, the current of the voltage sampling circuit is output from the voltage limiting circuit.
Optionally, the voltage limiting circuit includes two diodes connected in series in a forward direction, the former diode is grounded, and the latter diode is connected to a power supply having a preset voltage value; the node between the two diodes is connected to the signal output.
According to the method and the device for detecting the phase sequence of the compressor, the three-phase current and the three-phase voltage are collected firstly, then the back electromotive force difference between the three phases is calculated according to the three-phase current and the three-phase voltage, if the maximum value in the detected back electromotive force difference is larger than or equal to the reference threshold value, the phase sequence connection error is judged to occur, namely, the phase sequence connection error of the compressor can be effectively identified, the reverse rotation damage of the compressor is prevented, and the temperature signal is not required to be accumulated in the detection logic, so that the damage of the compressor can be effectively avoided compared with the technical scheme based on the temperature detection phase sequence.
Drawings
Fig. 1 is a schematic flow chart of a method for detecting a phase sequence of a compressor according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a method for detecting a phase sequence of a compressor according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a phase sequence detecting device of a compressor according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a current sampling circuit in a phase sequence detecting device of a compressor according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a voltage sampling circuit in a phase sequence detecting device of a compressor according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a control system according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
In the related art, when the controller is connected with the compressor, the situation that the phase sequence is misplaced and damaged after the compressor is reversed is avoided in the process because the phase sequence is manually distinguished and then connected by using a lead is needed. Currently, there is no effective solution.
Based on the above problems, the present application provides a method and an apparatus for detecting a phase sequence of a compressor, so as to solve the technical problem that in the related art, the phase sequence connection error of the compressor cannot be effectively identified, resulting in reverse rotation damage of the compressor. The following is a detailed description.
According to an embodiment of the present application, there is provided a method for detecting a phase sequence of a compressor, and in combination with fig. 1, the method includes:
step S101, collecting three-phase current and three-phase voltage at the input side of a compressor;
step S103, calculating back electromotive force differences between the three phases according to the three-phase currents and the three-phase voltages;
step S105, if the maximum value of the back electromotive force differences between the three phases is greater than or equal to the reference threshold, determining that the phase sequence is connected in error, and generating a fault prompting signal.
In this embodiment, first, after the compressor is powered on, three-phase current and three-phase voltage on the input side of the compressor may be collected by sampling units such as a voltage sampling circuit and a current sampling circuit.
Next, in step S103, the back electromotive force difference between each two phases of the three phases may be calculated from the collected three-phase current and three-phase voltage values. For example, naming A, B, C as three phases, i.e. the three-phase line of the compressor is the a phase, the B phase and the C phase, respectively, the corresponding back emf differences can be defined as: the difference between the counter electromotive forces of the A phase and the B phase is E ab The difference between the counter electromotive forces of the B phase and the C phase is E bc The difference between the counter electromotive forces of the C phase and the A phase is E ca 。
Then, in step S105, the maximum value of the three back electromotive force differences, namely, the slave E, is first confirmed ab 、E bc 、E ca The maximum value is marked as E max . Accordingly, in step S105, the preset reference threshold is recorded as E ref . If E is detected max≥ E ref Judging that the three-phase sequence is in a wrong connection state at the moment, generating a fault prompting signal, outputting the fault prompting signal through prompting devices such as sound, light, electricity and the like so as to remind staffAt this time, in the state of phase sequence connection error, the machine needs to be stopped in time, and the phase sequence connection mode is replaced.
After the fault prompting signal is generated, the machine can be stopped by manual control, or step S107 can be executed, and a stop signal is sent to the compressor, namely, the machine is automatically controlled to stop so as to stop the operation of the compressor more timely, and the damage of the compressor caused by reverse rotation is more reliably prevented.
Optionally, in step S103, the calculating the back electromotive force difference between the three phases according to the three-phase current and the three-phase voltage may be calculated by:
for any two-phase line, the back emf difference between the two phases is calculated as follows:
multiplying the stator phase resistance of the compressor by the difference between the stator phase current of the second phase and the stator phase current of the first phase to obtain a first potential term;
multiplying the effective inductance of the stator of the compressor by the instantaneous difference between the stator phase current of the second phase and the stator phase current of the first phase to obtain a second potential term;
and adding the first potential item and the second potential item, and subtracting the line voltage between the second phase and the third phase and the line voltage between the third phase and the first phase to obtain the counter electromotive force difference between the first phase and the second phase.
The derivation of this calculation is as follows:
the set of coupling circuit equations for the stator windings is:
wherein V is a ，V b ，V c The stator terminal voltages of the three phases are A, B, C respectively; r is stator phase resistance; l is the effective inductance of the stator; i a ，I b ，I c A stator phase current of A, B, C three phases; e (E) a ，E b ，E c Is A, B, C back electromotive force of three phases.
The line voltage V can be obtained by subtracting the two phases from the (1) ab ，V bc ，V ca The expression of (2) is:
as described above, the difference E between the counter electromotive forces of the a phase and the B phase is defined ab ＝E a -E b Difference E between counter electromotive forces of B phase and C phase bc ＝E b -E c Difference E between counter electromotive forces of C phase and A phase ca ＝E c -E a The formula (2) can be obtained by adding two by two:
from equation (3), the back electromotive force difference between any two phases can be obtained.
Optionally, the method further comprises:
after the compressor is started, detecting whether the current running frequency of the compressor reaches a preset frequency, if so, calculating the back electromotive force difference between the three phases according to the three-phase current and the three-phase voltage.
This step may be performed before step S101 or step S103. Because the counter electromotive force of the compressor at low frequency is small and cannot be used as a basis for judging whether phase sequence connection errors exist, the counter electromotive force is detected after the compressor is operated to a certain frequency in the embodiment. After the compressor is operated to a predetermined target frequency, a difference E of counter-electromotive force is calculated by sampling the voltage and current ab ，E bc ，E ca And find the maximum value of the three to be E max . Therefore, the judgment result of the connection correctness of the three-phase sequence can be more accurate.
Optionally, the reference threshold is determined according to the following manner:
measuring the maximum value of the back electromotive force between the first three phases when the phase sequence of the compressor is correctly connected;
measuring the maximum value of the back electromotive force between the second three phases when the phase sequence of the compressor is connected in error;
and determining the reference threshold according to the first three-phase counter electromotive force maximum value and the second three-phase counter electromotive force maximum value.
In the above determination manner, during the debugging process of the compressor, when the phase sequence of the compressor is correctly connected, the back electromotive force maximum value of the predetermined frequency is measured, when the phase sequence of the compressor is incorrectly connected, the back electromotive force maximum value of the predetermined frequency is measured, and the back electromotive force maximum values under two different conditions are compared to obtain the preferred threshold value for distinguishing whether the phase sequence error condition of the compressor exists. For example, a value can be taken between two back emf maxima, such as taking the average of the two as the preferred reference threshold.
Optionally, the method further comprises:
step S109, continuously comparing the maximum value of the three-phase back electromotive force differences with the reference threshold value in a preset time;
and step S111, if the maximum value of the back electromotive force differences between the three phases is still smaller than the reference threshold value when the predetermined time is over, controlling the compressor to operate normally.
In step S109 and step S111, the maximum value of the back electromotive force differences between the three phases is continuously detected and compared with the reference threshold value within a predetermined time, that is, a window time for detecting the phase sequence error is provided, if the phase sequence error connection exists, the compressor unit has enough time to enable the back electromotive force difference between the three phases to reach the reference threshold value within the detection time, so that erroneous judgment on the phase sequence connection error caused by the too short detection time is avoided.
Optionally, the predetermined time is determined by the following criteria: and in the preset time, the detected three-phase counter electromotive force difference of the compressor can be enough to reach the reference threshold value, and in the preset time, the compressor is not damaged if the phase sequence of the compressor is misplaced. That is, the preset time is taken as a sampling window time, and the back electromotive force of the compressor can be confirmed to be large enough in the time so as to judge whether the phase sequence error condition of the compressor exists or not, and the operation is carried out in the sampling window time, so that the compressor cannot be damaged when the phase sequence error occurs, and the double effects of detecting the phase sequence and avoiding the damage of the compressor are achieved.
FIG. 2 shows a method for detecting phase sequence of a compressor according to another embodiment of the present application, wherein after power-on initialization, the compressor is controlled to operate to F 1 Hz. Then, the voltage and current are sampled, and the maximum value E of the three-phase counter electromotive force difference value is calculated max Then judge the reference threshold E ref ＞E max If not, reporting a fault to stop, if yes, judging whether the window time is cut off, if not, continuing to sample the voltage and the current, and if yes, normally controlling and operating.
According to an embodiment of the present application, a compressor phase sequence detection apparatus is provided, which is configured to execute the compressor phase sequence detection method described in the foregoing embodiment, and in combination with fig. 3, specifically includes:
a sampling unit 21 for collecting three-phase current and three-phase voltage of the input side of the compressor;
a control unit 23, wherein the control unit 23 is connected with the sampling unit 21, and is used for calculating a back electromotive force difference between three phases according to the three-phase current and the three-phase voltage; and if the maximum value of the back electromotive force differences among the three phases is greater than or equal to a reference threshold value, judging that the phase sequence is connected with errors, and generating a fault prompting signal. The specific detection and control strategy of the control unit 23 may be referred to the description of the above embodiments, and will not be described herein.
Optionally, the sampling unit 21 includes a current sampling circuit; referring to fig. 4, the current sampling circuit includes a three-phase sampling terminal L1 and a reference ground terminal L2; the three-phase sampling end L1 is connected with the non-inverting input end of the operational amplifier chip U1 through a first resistor R1; the reference ground end L2 is connected with the inverting input end of the operational amplifier chip U1 through a second resistor R2; the output end of the operational amplifier chip U1 is connected to the control unit 23; the inverting input end of the operational amplifier chip U1 is also connected with the output end of the operational amplifier chip U1 through a third resistor R3. In addition, the third resistor R3 is also connected in parallel with a seventh capacitor C7.
The operational amplifier chip U1 is also connected with a power supply circuit, and comprises a 3.3V power supply, wherein the 3.3V power supply is connected with the operational amplifier chip U1 through a group of fifth capacitor C5 and sixth capacitor C6 which are connected in parallel.
The three-phase sampling end L1 is connected to a three-phase current output circuit, sampling data enter the control chip through the first signal output end L3 after passing through the operational amplifier chip U1, and the current is calculated and stored through the sampling data in the control chip.
Optionally, a bias circuit for biasing the negative half-axis current to the positive half-axis is further connected to a node between the first resistor R1 and the non-inverting input end of the op-amp chip U1. As an example, the bias circuit includes a fourth resistor R4 and a fourth capacitor C4 connected in parallel with the fourth resistor R4, where one end of the fourth resistor R4 is connected to a 1.65V power supply, and the other end is connected between the first resistor R1 and the non-inverting input terminal of the op-amp chip U1.
In addition, the three-phase sampling terminal L1 and the reference ground terminal L2 are further connected to a first capacitor C1 and a second capacitor C2, which can play a role of filtering as the other capacitors in the above embodiments.
Optionally, the adoption unit 21 includes a voltage sampling circuit, where the voltage sampling circuit includes a three-phase sampling end and a signal output end; the three-phase sampling end is grounded through at least two voltage dividing resistors, and two ends of the voltage dividing resistor close to the ground are connected with the signal output end through a filter circuit and connected to the control unit through the signal output end. For example, in the present embodiment, referring to fig. 5, the three-phase sampling terminal L1 is grounded through a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7. The filter circuit includes an eighth resistor R8 and an eighth capacitor C8.
The three-phase sampling end L1 is connected to three-phase reverse-flow output, and enters the control chip through the second signal output end L4 after voltage division through resistors, and the voltage is calculated and stored through sampling signals in the control chip.
Optionally, a voltage limiting circuit is further connected between the signal output end and the voltage dividing resistor connected with the signal output end, and when the voltage value of the voltage dividing resistor exceeds a threshold value, the current of the voltage sampling circuit is output from the voltage limiting circuit. Thus, the voltage can be controlled within the allowable range of the control chip.
For example, the voltage limiting circuit includes two diodes connected in series in the forward direction, namely a first diode D1 and a second diode D2, the former diode, namely the second diode, is grounded, and the latter diode, namely the first diode D1, is connected to a power source having a preset voltage value, such as 3.3V; the node between the two diodes is connected to the second signal output terminal L4 through an eighth resistor R8. Therefore, the voltage is controlled within 3.3V allowed by the control chip, and when the voltage exceeds 3.3V, the voltage can flow to 3.3V through the first diode D1 and the second diode D2, so that the chip is prevented from being damaged.
It should be understood that the voltage sampling circuit and the current sampling circuit described in the above embodiments are only exemplary, and other suitable voltage and current sampling circuit configurations may be substituted.
Fig. 6 shows a control system including a control chip, an IPM module, CMP (i.e., compressor), a voltage sampling circuit, a current sampling circuit, the IPM module and CMP being connected by a three-phase line U, V, W. The control chip is respectively connected with the IPM module, the voltage sampling circuit and the current sampling circuit.
The sampling end of the current sampling circuit is connected to the IPM three-phase current output, and the sampling end of the voltage sampling circuit is connected to the IPM three-phase reverse current output. The current sampling circuit and the voltage sampling circuit collect the output current voltage of the IPM and send the output current voltage to the control chip for calculating the back electromotive force of the compressor. The specific calculation manner and control strategy executed by the control chip may refer to the description of the above embodiments, and will not be described herein.
In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided by the present application, the described embodiments of the apparatus are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in practice, for example, 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 interfaces, units or modules, or may be in electrical or other forms.
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 on 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 foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.
Claims (13)
1. A method for detecting phase sequence of a compressor, comprising:
collecting three-phase current and three-phase voltage of the input side of the compressor;
calculating back electromotive force differences of three phases according to the three-phase currents and the three-phase voltages;
and if the maximum value of the back electromotive force differences among the three phases is greater than or equal to a reference threshold value, judging that the phase sequence is connected with errors, and generating a fault prompting signal.
2. The method of detecting a phase sequence of a compressor according to claim 1, wherein the calculating a back electromotive force difference between three phases from the three-phase current and the three-phase voltage includes:
for any two-phase line, the back emf difference between the two phases is calculated as follows:
multiplying the stator phase resistance of the compressor by the difference between the stator phase current of the second phase and the stator phase current of the first phase to obtain a first potential term;
multiplying the effective inductance of the stator of the compressor by the instantaneous difference between the stator phase current of the second phase and the stator phase current of the first phase to obtain a second potential term;
and adding the first potential item and the second potential item, and subtracting the line voltage between the second phase and the third phase and the line voltage between the third phase and the first phase to obtain the counter electromotive force difference between the first phase and the second phase.
3. The method of detecting a phase sequence of a compressor according to claim 1, wherein if a maximum value of back electromotive force differences between the three phases is greater than or equal to a reference threshold value, the method further comprises: and sending a shutdown instruction to the compressor.
4. The method of detecting a phase sequence of a compressor of claim 1, further comprising:
after the compressor is started, detecting whether the current running frequency of the compressor reaches a preset frequency, if so, calculating the back electromotive force difference between the three phases according to the three-phase current and the three-phase voltage.
5. The compressor phase sequence detection method of claim 1, wherein the reference threshold is determined according to the following manner:
measuring the maximum value of the back electromotive force between the first three phases when the phase sequence of the compressor is correctly connected;
measuring the maximum value of the back electromotive force between the second three phases when the phase sequence of the compressor is connected in error;
and determining the reference threshold according to the first three-phase counter electromotive force maximum value and the second three-phase counter electromotive force maximum value.
6. The method of detecting a phase sequence of a compressor of claim 1, further comprising:
continuously comparing the maximum value of the three-phase counter electromotive force differences with the reference threshold value within a preset time;
and if the maximum value of the back electromotive force differences among the three phases is still smaller than the reference threshold value when the preset time is cut off, controlling the compressor to normally operate.
7. The compressor phase sequence detection method according to claim 6, wherein the predetermined time is determined by: and in the preset time, the detected three-phase counter electromotive force difference of the compressor can be enough to reach the reference threshold value, and in the preset time, the compressor is not damaged if the phase sequence of the compressor is misplaced.
8. The compressor phase sequence detection device is characterized by comprising
The sampling unit is used for collecting three-phase current and three-phase voltage at the input side of the compressor;
the control unit is connected with the sampling unit and is used for calculating back electromotive force difference between three phases according to the three-phase current and the three-phase voltage; and if the maximum value of the back electromotive force differences among the three phases is greater than or equal to a reference threshold value, judging that the phase sequence is connected with errors, and generating a fault prompting signal.
9. The compressor phase sequence detection apparatus according to claim 8, wherein the sampling unit includes a current sampling circuit; the current sampling circuit comprises a three-phase sampling end and a reference ground end; the sampling end is connected with the non-inverting input end of the operational amplifier chip through a first resistor; the reference ground end is connected with the inverting input end of the operational amplifier chip through a second resistor; the output end of the operational amplifier chip is connected to the control unit; and the inverting input end of the operational amplifier chip is also connected with the output end of the operational amplifier chip through a third resistor.
10. The compressor phase sequence detection device of claim 9, wherein a bias circuit for biasing the negative half-shaft current to the positive half-shaft is further connected to a node between the first resistor and the non-inverting input terminal of the op-amp chip.
11. The compressor phase sequence detection device of claim 8, wherein the employing unit comprises a voltage sampling circuit comprising a three-phase sampling terminal and a signal output terminal; the three-phase sampling end is grounded through at least two voltage dividing resistors, and two ends of the voltage dividing resistor close to the ground are connected with the signal output end through a filter circuit and connected to the control unit through the signal output end.
12. The phase sequence detecting apparatus of claim 11, wherein a voltage limiting circuit is further connected between the signal output terminal and a voltage dividing resistor connected thereto, and when the voltage value of the voltage dividing resistor exceeds a threshold value, a current of the voltage sampling circuit is outputted from the voltage limiting circuit.
13. The phase sequence detecting apparatus of claim 12, wherein the voltage limiting circuit comprises two diodes connected in series in a forward direction, the former diode being grounded, the latter diode being connected to a power supply having a preset voltage value; the node between the two diodes is connected to the signal output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311163563.8A CN117074803A (en) | 2023-09-11 | 2023-09-11 | Method and device for detecting phase sequence of compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311163563.8A CN117074803A (en) | 2023-09-11 | 2023-09-11 | Method and device for detecting phase sequence of compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117074803A true CN117074803A (en) | 2023-11-17 |
Family
ID=88717074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311163563.8A Pending CN117074803A (en) | 2023-09-11 | 2023-09-11 | Method and device for detecting phase sequence of compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117074803A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118962269A (en) * | 2024-10-14 | 2024-11-15 | 兰州大成铁路信号股份有限公司 | Method and device for checking phase sequence of three-phase asynchronous motor |
-
2023
- 2023-09-11 CN CN202311163563.8A patent/CN117074803A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118962269A (en) * | 2024-10-14 | 2024-11-15 | 兰州大成铁路信号股份有限公司 | Method and device for checking phase sequence of three-phase asynchronous motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100566068C (en) | A hardware overvoltage disconnection circuit | |
| CN102257396B (en) | For the method for the controller and/or motor of monitoring three phase electric machine | |
| CN108604876B (en) | Motor control device | |
| CN117074803A (en) | Method and device for detecting phase sequence of compressor | |
| CN111022307A (en) | Compressor control method, compressor controller and air conditioning unit | |
| CN114114011A (en) | Fault detection circuit and electronic equipment | |
| CN102739131B (en) | Motor drive and use the heat pump assembly of this motor drive | |
| CN111044897A (en) | Relay state detection circuit, control method and whole vehicle integrated controller | |
| WO2005074119A1 (en) | Control method of brushless dc motor and the controller thereof | |
| CN208489807U (en) | A kind of brshless DC motor driving control system | |
| CN106026845B (en) | Fan driving device, air conditioning system and fan driving method thereof | |
| CN106787999A (en) | The startup localization method and its circuit of a kind of direct-current brushless no-hall motor | |
| CN211293695U (en) | Controller | |
| CN110442068A (en) | A kind of sample circuit and electric machine control system | |
| CN215817506U (en) | Power supply protection device of air source heat pump unit | |
| CN111287914A (en) | Fan monitoring device and method | |
| CN112146253A (en) | Air conditioner and compressor control method thereof | |
| CN110932236A (en) | Overcurrent open-phase detection protection circuit and method and compressor comprising circuit | |
| CN105929273B (en) | Air conditioner and its indoor electromechanical heater start-up detection system and method | |
| CN214795020U (en) | A phase loss detection circuit and electronic equipment | |
| CN110501604B (en) | Detection device and detection method for open-circuit fault of brushed direct-current fan | |
| CN106200508A (en) | Chain protection control circuit | |
| CN108462151A (en) | For protecting electro-motor to prevent the method and arrangement system of overheat | |
| CN219392160U (en) | Driving phase current sampling circuit, fault detection circuit and direct current fan | |
| RU2573404C2 (en) | Electric tools disconnection from electric mains by means of switches |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |