CN106569076B - Asynchronous motor three-phase sequence misconnection detection system and method - Google Patents
Asynchronous motor three-phase sequence misconnection detection system and method Download PDFInfo
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Abstract
The invention discloses a system and a method for detecting the misconnection of three-phase sequences of an asynchronous motor, which are characterized in that an excitation signal with stable frequency and amplitude is provided for the asynchronous motor in advance, the excitation signal is equivalent to a test signal, a feedback current under the test signal is sampled, then vector conversion and rotation conversion are carried out on the feedback current, and whether the misconnection of the three-phase sequences of the asynchronous motor is carried out is judged according to a conversion result, so that the misconnection of the asynchronous motor in the working process, direct burning loss and even safety accidents can be avoided.
Description
Technical Field
The invention relates to the field of motor control, in particular to a system and a method for detecting the misconnection of three-phase sequences of an asynchronous motor.
Background
With the popularization of new energy technology, asynchronous motors are widely applied to the fields of walking machinery, forklifts, automobiles and the like, in the production, assembly and use processes, the wiring of a three-phase cable is strictly regulated, and the normal operation of products is directly influenced when the three-phase sequence is misconnected. If the asynchronous motor is controlled in a V/F mode, the phenomenon of forward rotation and reverse rotation and reversal can occur due to misconnection of three-phase sequences, and the safe use is influenced. If the asynchronous motor is vector-controlled, the phenomenon of current and motor jitter can occur due to the misconnection of three-phase sequences, so that the asynchronous motor can generate heat seriously and even can not rotate normally.
In the prior art, whether the three-phase sequence of the asynchronous motor is misconnected or not can be detected by adding extra hardware, but in an actual product, the cost problem is considered, the extra hardware is not added on all the asynchronous motors to detect whether the three-phase sequence is misconnected or not, the misconnection is prevented by strictly requiring the wiring standard, the phenomenon of misconnection caused by human negligence cannot be avoided, once misconnection occurs, the running condition of the motor needs to be observed manually to judge whether the three-phase sequence is misconnected or not, and the wiring is changed to solve the problem when the misconnection occurs. However, the method only depends on subjective judgment, and needs a lot of experience of personnel to solve the problem in time, otherwise, the motor is damaged, and even the personnel are dangerous. How to reduce the cost for detecting whether the three-phase sequence of the asynchronous motor is misconnected is a technical problem to be solved urgently at present.
Disclosure of Invention
In view of this, the invention provides a system and a method for detecting a three-phase misconnection of an asynchronous motor, so as to reduce the cost of detecting whether a three-phase sequence of the asynchronous motor misconnects.
On one hand, the invention provides a three-phase sequence misconnection detection system of an asynchronous motor, which comprises an excitation signal providing device, a current signal sampling device and a control device, wherein the excitation signal providing device is used for providing an excitation signal;
the excitation signal providing device is connected with the asynchronous motor and is used for providing an excitation signal with stable frequency and amplitude for the asynchronous motor;
the current signal sampling device is connected with a current feedback end of the asynchronous motor and the control device, and is used for collecting three-phase current signals of the asynchronous motor under the excitation signal and transmitting the three-phase current signals to the control device;
the control device includes:
the receiving module is connected with the current signal sampling device and used for receiving the three-phase current signals;
the first conversion module is connected with the receiving module and used for carrying out vector conversion on the three-phase current signals to obtain a vector conversion result;
the second transformation module is connected with the first transformation module and used for carrying out rotation transformation on the vector transformation result to obtain a rotation transformation result;
and the judging module is connected with the second conversion module and used for judging whether the three-phase sequence of the asynchronous motor is misconnected or not according to the rotation conversion result.
Further, the determining module includes:
a first judgment unit for judging the formula
Whether the phase sequence of the asynchronous motor is true or not is judged, and if the phase sequence of the asynchronous motor is true, the three-phase sequence of the asynchronous motor is judged not to be misconnected; if the phase sequence of the asynchronous motor is not established, judging that the three-phase sequence of the asynchronous motor is misconnected;
wherein,and I is the peak value of the three-phase current signal as the rotation transformation result.
Further, the determining module further includes a second determining unit, configured to determine, according to the rotation conversion result, a misconnection type of the asynchronous motor when the three-phase sequence of the asynchronous motor is misconnected.
Further, the second judgment unit is specifically configured to judge a formula
If the false connection type is established, judging that the phase A generated by the excitation signal is in false connection with the phase B of the motor, the phase B generated by the excitation signal is in false connection with the phase C of the motor, and the phase C generated by the excitation signal is in false connection with the phase a of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase C of the motor, the phase B generated by the excitation signal is in error connection with the phase a of the motor, and the phase C generated by the excitation signal is in error connection with the phase B of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase B of the motor, the phase B generated by the excitation signal is in error connection with the phase a of the motor, and the phase C generated by the excitation signal is correctly connected with the phase C of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase C of the motor, the phase B generated by the excitation signal is correctly connected with the phase B of the motor, and the phase C generated by the excitation signal is in error connection with the phase a of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is correctly connected with the phase a of the motor, the phase B generated by the excitation signal is in error connection with the phase C of the motor, and the phase C generated by the excitation signal is in error connection with the phase B of the motor;
wherein,and as a result of the rotation transformation, I is a peak value of the three-phase current signal, and w is 2 pi f.
Further, the frequency of the excitation signal is less than 50% of the rated frequency of the asynchronous motor, and the amplitude of the excitation signal enables the three-phase current signal to be within the range of 5% -15% of the rated current of the asynchronous motor.
On the other hand, the invention also provides a three-phase sequence misconnection detection method for the asynchronous motor, which comprises the following steps:
providing an excitation signal with stable frequency and amplitude for the asynchronous motor;
collecting three-phase current signals of the asynchronous motor under the excitation signals;
carrying out vector transformation on the three-phase current signals to obtain a vector transformation result;
carrying out rotation transformation on the vector transformation result to obtain a rotation transformation result;
and judging whether the three-phase sequence of the asynchronous motor is misconnected or not according to the rotation conversion result.
Further, the step of determining whether the three-phase sequence of the asynchronous motor is misconnected according to the rotation conversion result specifically includes: judgment formula
Whether the phase sequence of the asynchronous motor is true or not is judged, and if the phase sequence of the asynchronous motor is true, the three-phase sequence of the asynchronous motor is judged not to be misconnected; if the phase sequence of the asynchronous motor is not established, judging that the three-phase sequence of the asynchronous motor is misconnected;
wherein,and I is the peak value of the three-phase current signal as the rotation transformation result.
Further, the method also comprises the following steps: and under the condition of the three-phase sequence misconnection of the asynchronous motor, judging the misconnection type of the asynchronous motor according to the rotation conversion result.
Further, under the condition that the three-phase sequence of the asynchronous motor is in misconnection, the step of determining the misconnection type of the asynchronous motor according to the rotation conversion result specifically comprises the following steps:
judgment formula
If the false connection type is established, judging that the phase A generated by the excitation signal is in false connection with the phase B of the motor, the phase B generated by the excitation signal is in false connection with the phase C of the motor, and the phase C generated by the excitation signal is in false connection with the phase a of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase C of the motor, the phase B generated by the excitation signal is in error connection with the phase a of the motor, and the phase C generated by the excitation signal is in error connection with the phase B of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase B of the motor, the phase B generated by the excitation signal is in error connection with the phase a of the motor, and the phase C generated by the excitation signal is correctly connected with the phase C of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase C of the motor, the phase B generated by the excitation signal is correctly connected with the phase B of the motor, and the phase C generated by the excitation signal is in error connection with the phase a of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is correctly connected with the phase a of the motor, the phase B generated by the excitation signal is in error connection with the phase C of the motor, and the phase C generated by the excitation signal is in error connection with the phase B of the motor;
the sequence of the judging formula steps can be changed randomly;
wherein,and as a result of the rotation transformation, I is a peak value of the three-phase current signal, and w is 2 pi f.
Further, the frequency of the excitation signal is less than 50% of the rated frequency of the asynchronous motor, and the amplitude of the excitation signal enables the three-phase current signal to be within the range of 5% -15% of the rated current of the asynchronous motor.
The invention provides a system and a method for detecting the misconnection of three-phase sequences of an asynchronous motor, which are characterized in that an excitation signal with stable frequency and amplitude is provided for the asynchronous motor in advance, the excitation signal is equivalent to a test signal, a feedback current under the test signal is sampled, vector conversion and rotation conversion are carried out on the feedback current, and whether the misconnection of the three-phase sequences of the asynchronous motor is carried out is judged according to a conversion result, so that the misconnection of the asynchronous motor in the working process, direct burning loss and even safety accidents can be avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a prior art vector control system for an asynchronous motor;
FIG. 2 is a block diagram of an embodiment of the system for detecting the three-phase sequence misconnection of the asynchronous motor according to the present invention;
FIG. 3 is a structural diagram of an embodiment of a determination module of the system for detecting the three-phase sequence misconnection of the asynchronous motor according to the present invention;
4-9 are schematic diagrams of three-phase connection modes of the asynchronous motor;
FIG. 10 is a flowchart of an embodiment of a method for detecting a three-phase sequence misconnection of an asynchronous motor according to the present invention;
fig. 11 is a flowchart of another embodiment of the method for detecting a three-phase sequence misconnection of an asynchronous motor according to the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, a prior art motor vector control system is shown. In the system, input voltage is subjected to 2R/2S conversion, and is subjected to the control of the on-off time of an IGBT in an inverter by an SVPWM pulse generator, so that three-phase voltage is loaded into an asynchronous motor. The invention is not limited in application scope, and the system for detecting the three-phase sequence misconnection of the asynchronous motor can be applied to any type of motor control system.
Referring to fig. 2, an embodiment of the present invention is shown, which is an asynchronous motor three-phase sequence misconnection detection system, including an excitation signal providing device 100, a current signal sampling device 200, and a control device 300.
Excitation signal providing device 100, connected to the input voltage terminal of the asynchronous motor vector control system illustrated in fig. 1, for providing the asynchronous motor with a frequency f and an amplitude ud、uqThe stable excitation signal of (2). And a current signal sampling device 200 connected with the current feedback end thereof for collecting the excitation signal of the asynchronous motorThe signal providing device 100 provides a feedback three-phase current signal under the excitation signal. The current signal collecting device 200 is further connected to the control device 300, and is configured to transmit the collected three-phase current signal to the control device 300.
A control device 300 comprising: the receiving module 310 is connected with the current signal sampling device 200 and is used for receiving a three-phase current signal; the first conversion module 320 is connected with the receiving module 310, receives the sampled three-phase current signals, and performs vector conversion on the three-phase current signals to obtain a vector conversion result; the second transformation module 330 is connected to the first transformation module 320, and receives the vector transformation result of the first transformation module 320, and performs rotation transformation on the vector transformation result to obtain a rotation transformation result; the determining module 340 is connected to the second converting module 330, receives the rotation conversion result, and determines whether the three-phase sequence of the asynchronous motor is misconnected according to the rotation conversion result.
In this embodiment, an excitation signal with stable frequency and amplitude is provided to the asynchronous motor in advance by the excitation signal providing device 100, which is equivalent to a test signal, and the feedback current under the test signal is sampled by the current signal sampling device 200 and input to the control device 300, the control device 300 performs vector conversion and rotation conversion on the feedback current, and determines whether the three-phase sequence of the asynchronous motor is misconnected according to the conversion result, so as to avoid the asynchronous motor from being misconnected during operation, directly burned and even causing a safety accident.
Preferably, the determining module 340 includes:
first judgment unit 341, judgment formula
And if so, judging that the three-phase sequence of the asynchronous motor is not misconnected. If the phase sequence is not established, the three-phase sequence of the asynchronous motor is judged to be misconnected.
Wherein,for the result of the rotational transformation, I is the peak value of the three-phase current signal.
In this embodiment, a specific structure of the determining module 340 is given, and a specific form of determining whether the three-phase sequence of the asynchronous motor is misconnected is described in detail. Next, the validity of the specific form that the determination module 340 determines whether the three-phase sequence of the asynchronous motor is misconnected is verified.
It is assumed that the asynchronous machine has a frequency f and an amplitude u supplied by the excitation signal supply device 100d、uqUnder the driving of the stable excitation signal, the three-phase current signal sampled by the current signal sampling device 200 is:
Ia＝Icos(wt)
wherein, I is the peak value of the three-phase current signal, w is 2 pi f,is a three-phase current signal.
If the A, B, C three phases of the IGBT are not connected to the a, b, and c three phases of the motor in error, as shown in fig. 4, the vector conversion result of the three-phase current signals is as follows according to the vector conversion formula:
further, as can be seen from the rotation transformation formula, the rotation transformation result is:
by applying three-phase current signalsSum vector transformation resultSubstituting the rotation transformation result can obtain:
therefore, as shown in fig. 4, if there is no connection error between the A, B, C three phases of the IGBT and the a, b, c three phases of the motor, the formula
If the three-phase sequence of the asynchronous motor is not established, the three-phase sequence of the asynchronous motor can be judged to be misconnected.
More preferably, as shown in fig. 3, the determining module 340 further includes a second determining unit 342, configured to determine a misconnection type of the asynchronous motor according to the rotation conversion result when the asynchronous motor is misconnected in the three-phase sequence.
In this embodiment, the determining module 340 further includes a second determining unit 342, which can determine the misconnection type of the asynchronous motor according to the rotation conversion result under the condition that the three-phase sequence of the asynchronous motor is misconnected, and inform an operator, so that the operator can quickly determine which phase sequence is misconnected according to the misconnection type of the asynchronous motor, change the wiring between the phase IGBTs and the motor, and timely and quickly solve the problem of misconnection of the phase sequence without probing where the three-phase wiring is misconnected without any trouble.
In more detail, the second judgment unit 342 is specifically used for judging the formula
If the false-positive type is established, the false-positive type is determined as shown in fig. 5, where phase a generated by the excitation signal is in false-positive with phase B of the motor, phase B generated by the excitation signal is in false-positive with phase C of the motor, and phase C generated by the excitation signal is in false-positive with phase a of the motor.
If not, judging the formula
And if yes, judging that the misconnection type is as follows: as shown in fig. 6, phase a generated by the excitation signal is erroneously connected to phase C of the motor, phase B generated by the excitation signal is erroneously connected to phase a of the motor, and phase C generated by the excitation signal is erroneously connected to phase B of the motor.
If not, judging the formula
And if yes, judging that the misconnection type is as follows: as shown in fig. 7, phase a generated by the excitation signal is erroneously connected to phase B of the motor, phase B generated by the excitation signal is erroneously connected to phase a of the motor, and phase C generated by the excitation signal is correctly connected to phase C of the motor.
If not, judging the formula
And if yes, judging that the misconnection type is as follows: as shown in fig. 8, phase a generated by the excitation signal is erroneously connected to phase C of the motor, phase B generated by the excitation signal is correctly connected to phase B of the motor, and phase C generated by the excitation signal is erroneously connected to phase a of the motor.
If not, judging the formula
And if yes, judging that the misconnection type is as follows: as shown in fig. 9, phase a generated by the excitation signal is correctly connected to phase a of the motor, phase B generated by the excitation signal is incorrectly connected to phase C of the motor, and phase C generated by the excitation signal is incorrectly connected to phase B of the motor.
Wherein,for the result of the rotation transformation, I is the peak value of the three-phase current signal, w ═ 2 pi f.
In this embodiment, a specific form in which the second determination unit 342 determines the misconnection type of the asynchronous motor is given. Next, the validity of this particular form is verified.
As shown in fig. 5, if phase a generated by the excitation signal is erroneously connected to phase B of the motor, phase B generated by the excitation signal is erroneously connected to phase C of the motor, and phase C generated by the excitation signal is erroneously connected to phase a of the motor, it is known that the rotation conversion result of the three-phase current signals is:
as shown in fig. 6, if phase a generated by the excitation signal is erroneously connected to phase C of the motor, phase B generated by the excitation signal is erroneously connected to phase a of the motor, and phase C generated by the excitation signal is erroneously connected to phase B of the motor, it is known that the rotation conversion result of the three-phase current signals is:
as shown in fig. 7, if the phase a generated by the excitation signal is erroneously connected to the phase B of the motor, the phase B generated by the excitation signal is erroneously connected to the phase a of the motor, and the phase C generated by the excitation signal is correctly connected to the phase C of the motor, it is known that the rotation conversion result of the three-phase current signal is:
as shown in fig. 8, if the phase a generated by the excitation signal is erroneously connected to the phase C of the motor, the phase B generated by the excitation signal is correctly connected to the phase B of the motor, and the phase C generated by the excitation signal is erroneously connected to the phase a of the motor, it is known that the rotation conversion result of the three-phase current signal is:
as shown in fig. 9, if the phase a generated by the excitation signal is correctly connected to the phase a of the motor, the phase B generated by the excitation signal is incorrectly connected to the phase C of the motor, and the phase C generated by the excitation signal is incorrectly connected to the phase B of the motor, it can be seen that the rotation conversion result of the three-phase current signal is:
therefore, the second determining unit 342 can determine the misconnection type of the asynchronous motor according to the different rotation conversion results corresponding to the different connection modes.
Preferably, the frequency of the excitation signal is less than 50% of the rated frequency of the asynchronous motor, and the amplitude of the excitation signal is such that the three-phase current signal is in the range of 5% -15% of the rated current of the asynchronous motor.
In the embodiment, the frequency and the amplitude of the excitation signal are further optimized, so that the situation that the amplitude is too small, the feedback current is too small, the accuracy of a detection result is influenced, and the situation that the amplitude is too large, the misoperation of the asynchronous motor, even burning loss and safety accidents are caused can be avoided. More preferably, the frequency of the excitation signal is, in particular, 50 Hz.
On the other hand, as shown in fig. 10, the invention further provides a method for detecting the three-phase sequence misconnection of the asynchronous motor, which comprises the following steps:
s100: and an excitation signal with stable frequency and amplitude is provided for the asynchronous motor.
S200: and acquiring three-phase current signals of the asynchronous motor under the excitation signals.
S300: and carrying out vector transformation on the three-phase current signals to obtain a vector transformation result.
S400: and performing rotation transformation on the vector transformation result to obtain a rotation transformation result.
S500: and judging whether the three-phase sequence of the asynchronous motor is misconnected or not according to the rotation conversion result.
Preferably, in step S500, the step of determining whether the three-phase sequence of the asynchronous motor is misconnected according to the rotation conversion result includes: judgment formula
And if so, judging that the three-phase sequence of the asynchronous motor is not misconnected. If the phase sequence is not established, the three-phase sequence of the asynchronous motor is judged to be misconnected.
Wherein,for the result of the rotational transformation, I is the peak value of the three-phase current signal.
Preferably, the method for detecting the three-phase sequence misconnection of the asynchronous motor further comprises the following steps:
s600: and under the condition of the misconnection of the three-phase sequence of the asynchronous motor, judging the misconnection type of the asynchronous motor according to the rotation conversion result.
Preferably, in step S600, in the case of a three-phase sequence misconnection of the asynchronous motor, the step of determining the misconnection type of the asynchronous motor according to the rotation conversion result specifically includes:
judgment formula
And if so, judging that the misconnection type is that the phase A generated by the excitation signal is misconnected with the phase B of the motor, the phase B generated by the excitation signal is misconnected with the phase C of the motor, and the phase C generated by the excitation signal is misconnected with the phase a of the motor.
If not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase C of the motor, the phase B generated by the excitation signal is in error connection with the phase a of the motor, and the phase C generated by the excitation signal is in error connection with the phase B of the motor.
If not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase B of the motor, the phase B generated by the excitation signal is in error connection with the phase a of the motor, and the phase C generated by the excitation signal is correctly connected with the phase C of the motor.
If not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase C of the motor, the phase B generated by the excitation signal is correctly connected with the phase B of the motor, and the phase C generated by the excitation signal is in error connection with the phase a of the motor.
If not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is correctly connected with the phase a of the motor, the phase B generated by the excitation signal is in error connection with the phase C of the motor, and the phase C generated by the excitation signal is in error connection with the phase B of the motor.
Wherein,for the result of the rotation transformation, I is the peak value of the three-phase current signal, w ═ 2 pi f.
It should be noted that this embodiment is only an example, and the order of the steps of the judgment formula is not limited, and the order of the steps of the judgment formula may be arbitrarily changed.
Preferably, the frequency of the excitation signal is less than 50% of the rated frequency of the asynchronous motor, and the amplitude of the excitation signal is such that the three-phase current signal is in the range of 5% -15% of the rated current of the asynchronous motor.
The above method for detecting the three-phase sequence misconnection of the asynchronous motor corresponds to a system for detecting the three-phase sequence misconnection of the asynchronous motor, and the specific implementation and technical effects thereof are not described herein again. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The system is characterized by comprising an excitation signal providing device, a current signal sampling device and a control device;
the excitation signal providing device is connected with the asynchronous motor and is used for providing an excitation signal with stable frequency and amplitude for the asynchronous motor;
the current signal sampling device is connected with a current feedback end of the asynchronous motor and the control device, and is used for collecting three-phase current signals of the asynchronous motor under the excitation signal and transmitting the three-phase current signals to the control device;
the control device includes:
the receiving module is connected with the current signal sampling device and used for receiving the three-phase current signals;
the first conversion module is connected with the receiving module and used for carrying out vector conversion on the three-phase current signals to obtain a vector conversion result;
the second transformation module is connected with the first transformation module and used for carrying out rotation transformation on the vector transformation result to obtain a rotation transformation result;
the judging module is connected with the second conversion module and used for judging whether the three-phase sequence of the asynchronous motor is misconnected or not according to the rotation conversion result;
the judging module comprises:
a first judgment unit for judging the formula
Whether the phase sequence of the asynchronous motor is true or not is judged, and if the phase sequence of the asynchronous motor is true, the three-phase sequence of the asynchronous motor is judged not to be misconnected; if the phase sequence of the asynchronous motor is not established, judging that the three-phase sequence of the asynchronous motor is misconnected;
wherein,and I is the peak value of the three-phase current signal as the rotation transformation result.
2. The system according to claim 1, wherein the determining module further comprises a second determining unit configured to determine a misconnection type of the asynchronous motor according to the rotation conversion result when the asynchronous motor is connected in a misconnection manner in the three-phase sequence.
3. The system according to claim 2, wherein the second determining unit is specifically configured to determine a formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase B of the motor, the phase B generated by the excitation signal is in error connection with the phase C of the motor, and the phase C generated by the excitation signal is in error connection with the phase a of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase C of the motor, the phase B generated by the excitation signal is in error connection with the phase a of the motor, and the phase C generated by the excitation signal is in error connection with the phase B of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase B of the motor, the phase B generated by the excitation signal is in error connection with the phase a of the motor, and the phase C generated by the excitation signal is correctly connected with the phase C of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase C of the motor, the phase B generated by the excitation signal is correctly connected with the phase B of the motor, and the phase C generated by the excitation signal is in error connection with the phase a of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is correctly connected with the phase a of the motor, the phase B generated by the excitation signal is in error connection with the phase C of the motor, and the phase C generated by the excitation signal is in error connection with the phase B of the motor;
wherein,and as a result of the rotation transformation, I is a peak value of the three-phase current signal, w is 2 pi f, and f is the frequency of the excitation signal.
4. The system according to any one of claims 1 to 3, wherein the frequency of the excitation signal is less than 50% of the rated frequency of the asynchronous motor, and the amplitude of the excitation signal is such that the three-phase current signal is in the range of 5% to 15% of the rated current of the asynchronous motor.
5. A three-phase sequence misconnection detection method for an asynchronous motor is characterized by comprising the following steps:
providing an excitation signal with stable frequency and amplitude for the asynchronous motor;
collecting three-phase current signals of the asynchronous motor under the excitation signals;
carrying out vector transformation on the three-phase current signals to obtain a vector transformation result;
carrying out rotation transformation on the vector transformation result to obtain a rotation transformation result;
judging whether the three-phase sequence of the asynchronous motor is misconnected or not according to the rotation conversion result;
the step of judging whether the three-phase sequence of the asynchronous motor is misconnected or not according to the rotation conversion result specifically comprises the following steps: judgment formula
Whether the phase sequence of the asynchronous motor is true or not is judged, and if the phase sequence of the asynchronous motor is true, the three-phase sequence of the asynchronous motor is judged not to be misconnected; if the phase sequence of the asynchronous motor is not established, judging that the three-phase sequence of the asynchronous motor is misconnected;
wherein,and I is the peak value of the three-phase current signal as the rotation transformation result.
6. The method for detecting the misconnection of the three-phase sequence of the asynchronous motor according to claim 5, further comprising the steps of: and under the condition of the three-phase sequence misconnection of the asynchronous motor, judging the misconnection type of the asynchronous motor according to the rotation conversion result.
7. The method for detecting the misconnection of the three-phase sequence of the asynchronous motor according to claim 6, wherein the step of determining the misconnection type of the asynchronous motor according to the rotation conversion result under the condition that the three-phase sequence of the asynchronous motor is misconnected specifically comprises the following steps:
judgment formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase B of the motor, the phase B generated by the excitation signal is in error connection with the phase C of the motor, and the phase C generated by the excitation signal is in error connection with the phase a of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase C of the motor, the phase B generated by the excitation signal is in error connection with the phase a of the motor, and the phase C generated by the excitation signal is in error connection with the phase B of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase B of the motor, the phase B generated by the excitation signal is in error connection with the phase a of the motor, and the phase C generated by the excitation signal is correctly connected with the phase C of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is in error connection with the phase C of the motor, the phase B generated by the excitation signal is correctly connected with the phase B of the motor, and the phase C generated by the excitation signal is in error connection with the phase a of the motor;
if not, judging the formula
And if yes, judging that the misconnection type is as follows: the phase A generated by the excitation signal is correctly connected with the phase a of the motor, the phase B generated by the excitation signal is in error connection with the phase C of the motor, and the phase C generated by the excitation signal is in error connection with the phase B of the motor;
the sequence of the judging formula steps can be changed randomly;
wherein,and as a result of the rotation transformation, I is a peak value of the three-phase current signal, w is 2 pi f, and f is the frequency of the excitation signal.
8. The method for detecting the misconnection of the three-phase sequence of the asynchronous motor according to any one of the claims 5 to 7, wherein the frequency of the excitation signal is less than 50% of the rated frequency of the asynchronous motor, and the amplitude of the excitation signal is such that the three-phase current signal is within the range of 5% -15% of the rated current of the asynchronous motor.
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