CN109474211B - Method, device and system for detecting starting sub-synchronization of synchronous motor - Google Patents
Method, device and system for detecting starting sub-synchronization of synchronous motor Download PDFInfo
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The application relates to a method, a device and a system for detecting the starting subsynchronous of a synchronous motor, wherein the method comprises the following steps: and acquiring induced current data detected by the asynchronous starting current detection device, and filtering the induced current data to obtain filtered current data. And obtaining the slip frequency of the starting of the synchronous motor according to the filtered current data. And when the filtered current data and the slip frequency meet the preset excitation switching condition, carrying out excitation switching on the synchronous motor. And performing out-of-step detection on the synchronous motor according to current data acquired and filtered after excitation of the synchronous motor, so as to obtain a detection result. The method has the advantages that the slip frequency of the synchronous motor starting is calculated by collecting the induced current of the rotor when the starting winding of the synchronous motor is started asynchronously, further excitation switching control is carried out, out-of-step detection is carried out after the synchronous motor is excited and switched, complex peripheral hardware does not need to be added, interference is not prone to occurring, and the detection reliability is improved.
Description
Technical Field
The application relates to the technical field of asynchronous starting control of motors, in particular to a method, a device and a system for detecting starting sub-synchronization of a synchronous motor.
Background
A synchronous motor is an alternating-current motor that generates torque by interaction between a dc-supplied excitation magnetic field and a rotating magnetic field of an armature, and rotates at a synchronous rotational speed. The synchronous motor can be operated under the advanced power factor by adjusting the exciting current, and the power factor of a power grid is favorably improved. The synchronous motor is asynchronously started to 95% of sub-synchronous speed through the starting winding, and forced excitation is carried out when the direction of the induction field of the rotor is consistent with the direction of excitation to be applied, so that the synchronous motor is forced to be dragged into synchronization, and the starting of the motor is completed.
The traditional method for detecting the forward polarity slip excitation of the synchronous motor is to carry out excitation by detecting the rotating speed of a synchronous electric rotor, install a fluted disc at the corresponding position of the electric rotor, detect the rotating speed of the rotor by using an optical inductance sensor, and carry out forward polarity excitation by using the installation position of the fluted disc when the rotating speed reaches 95%. The method needs complex designed peripheral hardware, is easy to interfere and has the defect of low detection reliability.
Disclosure of Invention
In view of the above, it is desirable to provide a method, an apparatus and a system for detecting a start sub-synchronization of a synchronous motor, which can improve detection reliability.
A method for detecting the starting subsynchronization of a synchronous motor comprises the following steps:
acquiring induced current data detected by an asynchronous starting current detection device; the induction current data is obtained by detecting induction current of a rotor when a starting winding of the synchronous motor is asynchronously started by the asynchronous starting current detection device;
filtering the induced current data to obtain filtered current data;
obtaining the starting slip frequency of the synchronous motor according to the filtered current data;
when the filtered current data and the slip frequency meet a preset excitation condition, carrying out excitation on the synchronous motor;
and performing out-of-step detection on the synchronous motor according to current data acquired and filtered after the synchronous motor is excited, so as to obtain a detection result.
A synchronous motor start subsynchronous detection apparatus comprising:
the current data acquisition module is used for acquiring induced current data detected by the asynchronous starting current detection device; the induction current data is obtained by detecting induction current of a rotor when a starting winding of the synchronous motor is asynchronously started by the asynchronous starting current detection device;
the current data filtering module is used for filtering the induced current data to obtain filtered current data;
the slip frequency calculation module is used for obtaining the starting slip frequency of the synchronous motor according to the filtered current data;
the excitation switching control module is used for carrying out excitation switching on the synchronous motor when the filtered current data and the slip frequency meet a preset excitation switching condition;
and the step-out detection module is used for carrying out step-out detection on the synchronous motor according to current data acquired and filtered after the synchronous motor is excited and switched on to obtain a detection result.
A synchronous motor starting sub-synchronous detection system comprises an asynchronous starting current detection device and a controller, wherein the controller is connected with the asynchronous starting current detection device; the asynchronous starting current detection device is arranged in a starting winding of the synchronous motor and used for detecting induced current of a rotor when the starting winding of the synchronous motor is started asynchronously to obtain induced current data and sending the induced current data to the controller, and the controller is used for detecting step loss of the synchronous motor according to the method.
The method, the device and the system for detecting the starting sub-synchronization of the synchronous motor receive induced current data obtained by detecting the induced current of a rotor when a starting winding of the synchronous motor is started asynchronously by the asynchronous starting current detection device. And filtering the induced current data, and obtaining the starting slip frequency of the synchronous motor according to the filtered current data. When the filtered current data and the slip frequency meet the preset excitation condition, carrying out excitation on the synchronous motor; and performing out-of-step detection on the synchronous motor according to current data acquired and filtered after excitation of the synchronous motor, so as to obtain a detection result. The method has the advantages that the slip frequency of the synchronous motor starting is calculated by collecting the induced current of the rotor when the starting winding of the synchronous motor is started asynchronously, further excitation switching control is carried out, and out-of-step detection is carried out after the synchronous motor is excited and switched, so that no complex peripheral hardware is required to be added, the manufacturing cost is reduced, the interference is not easily caused, and the detection reliability is improved.
Drawings
FIG. 1 is a flow diagram of a method for detecting a start-up sub-synchronization of a synchronous motor according to one embodiment;
FIG. 2 is a flow chart of a method for detecting a start-up sub-synchronization of a synchronous motor according to another embodiment;
FIG. 3 is a block diagram of a start-up sub-synchronization detecting apparatus of a synchronous motor according to an embodiment;
FIG. 4 is a block diagram showing the structure of a starting sub-synchronization detecting device of a synchronous motor according to another embodiment;
FIG. 5 is a block diagram of a system for detecting a start-up sub-synchronization of a synchronous motor according to an embodiment;
FIG. 6 is a schematic diagram of an asynchronous start of a synchronous motor in one embodiment;
FIG. 7 is a schematic diagram of induced current of the rotor during an asynchronous start in one embodiment;
FIG. 8 is a diagram illustrating asynchronous start excitation recording according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, a method for detecting a start-up sub-synchronization of a synchronous motor is provided, as shown in fig. 1, including:
step S110: and acquiring induction current data detected by the asynchronous starting current detection device.
The induction current data is obtained by detecting the induction current of the rotor when the starting winding of the synchronous motor is asynchronously started by the asynchronous starting current detection device. Specifically, the controller may receive data of an induced current detected by the asynchronous starting current detecting device, may jump an asynchronous starting resistor in a starting winding of the synchronous motor, and may be configured to detect the induced current of the rotor when the starting winding of the synchronous motor is asynchronously started.
The specific type of the asynchronous starting current detection device is not exclusive, and specifically a hall sensor may be employed. The resistance value R of the asynchronous starting resistor entering the starting winding is 10 × ULn/ILn, ULn is the rated exciting voltage of the synchronous motor, and ILn is the rated exciting current of the synchronous motor. The model selection of the Hall sensor is I ═ ILn 0.2, ILn is rated exciting current of the synchronous motor, I is primary side current of the Hall sensor, and secondary side current of the Hall sensor can be 5A or 1A according to requirements. The controller collects the induced current output by the Hall sensor to obtain induced current data.
In one embodiment, step S110 includes: and sampling the induced current detected by the asynchronous starting current detection device according to a preset sampling interval to obtain induced current data. The specific value of the sampling interval is not unique and can be adjusted according to actual requirements. Specifically, the controller can sample the current of the Hall sensor according to the sampling interval to obtain induced current data, and the operation is simple, convenient and reliable.
Step S120: and filtering the induced current data to obtain filtered current data.
Specifically, the controller filters the sampled induced current data through software, and the filtering function is as follows: 1/(C × S), the principle of which is a direct current through the capacitor. The magnitude of the capacitor C is related to the rotor induced current, and is usually set to 0.1 microfarad, and S is an operation factor. The sampled induced current data is filtered, so that the filtered current data is used for subsequent calculation, clutter interference is reduced, and calculation accuracy is improved.
In one embodiment, step S120 includes step 122 and step 124.
Step 122: and obtaining the filtering data length according to the sampling interval. Specifically, the filtering data length is calculated as follows: and N is 0.4/T, wherein T is a sampling interval, N is a filtering data length, and a filtering bandwidth with the slip of 2.50HZ is set.
Step 124: and filtering the induced current data according to the filtering data length and a preset data threshold value to obtain filtered current data.
The specific value of the data threshold value is not unique and can be set according to the actual situation. Specifically, the set Data threshold Data is used for preventing interference, a Data filtering window is determined according to the Data threshold Data and the filtering Data length N to filter the induced current Data, and a series of Data Dn are obtained after filtering. Within the data filtering window:
Data<Dn n<N
Data<D(n-l)(n-l)<N
the number of counts obtained was: and l is n- (n-l), wherein l is the number of the filtered current data.
Step S130: and obtaining the slip frequency of the starting of the synchronous motor according to the filtered current data.
Specifically, after the induction current data are filtered, the controller calculates the slip frequency of the synchronous motor according to the number of the filtered current data. In one embodiment, step S130 includes: and obtaining the starting slip frequency of the synchronous motor according to the number of the filtered current data and the sampling interval. The method specifically comprises the following steps: and f is 1/(l × T), wherein T is a sampling interval, l is the number of the current data after filtering, and f is a slip frequency of the synchronous motor start.
Step S140: and when the filtered current data and the slip frequency meet the preset excitation switching condition, carrying out excitation switching on the synchronous motor.
The specific content of the excitation commissioning condition is not unique, and in one embodiment, the excitation commissioning condition includes that the slip frequency is less than or equal to a preset slip threshold, and data greater than a preset data threshold exists in the filtered current data. The specific value of the preset slip threshold is not unique and can be adjusted according to the actual situation. Specifically, the controller detects data Dn obtained after filtering, and when the following conditions are satisfied:
1: the slip frequency f is less than or equal to a preset slip threshold
2: the Data threshold Data is less than Dn (as long as there is one Data greater than this value)
When both of the above conditions are satisfied, excitation of the synchronous motor is performed.
Step S150: and performing out-of-step detection on the synchronous motor according to current data acquired and filtered after excitation of the synchronous motor, so as to obtain a detection result.
After the synchronous motor is successfully excited asynchronously, the controller continuously samples and filters the induced current sent by the asynchronous starting current detection device, and detects the step-out of the synchronous motor according to the filtered current data. The way in which the controller performs out-of-sync detection is not exclusive, and in one embodiment, step S150 includes: when current data acquired and filtered after excitation of the synchronous motor is smaller than a preset data threshold value, judging whether the current data crosses the data threshold value within a preset unit time period and the crossing times reach preset times; if so, the detection result is that the synchronous motor is out of step; if not, the detection result is that the synchronous motor does not generate step loss. The crossing data threshold value means that the current data obtained by filtering in the preset unit time period is changed from being smaller than the data threshold value to being larger than the data threshold value, or the current data obtained by filtering in the preset unit time period is changed from being larger than the data threshold value to being smaller than the data threshold value. Specifically, the values of the preset unit time period and the preset times are not unique, and in this embodiment, the preset unit time period is 1 second, and the preset times are 3 times. During the operation of the synchronous motor, the controller detects Data Dn obtained after filtering when the Data threshold value Data > Dn (N < N) is reached, and passes through once within 1 second and three passes are continuously reached, so that the synchronous motor is proved to be out of step.
Further, in one embodiment, as shown in fig. 2, after step S150, the method may further include step S160.
Step S160: and outputting motor out-of-step prompt information when the detection result indicates that the synchronous motor is out of step. When the synchronous motor is out of step, the motor out-of-step prompt information is output to give an alarm, so that the staff can know the information and remind the staff to perform corresponding processing, such as stopping, step-up and other measures, and the control reliability of the synchronous motor is improved. The method for outputting the motor step-out prompt information to give an alarm is not unique, and the alarm can be given by one or more of controlling a display screen to display preset pictures or character information, controlling a loudspeaker to sound and controlling an alarm lamp to flash.
It should be understood that although the various steps in the flow charts of fig. 1-2 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-2 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
According to the synchronous motor starting sub-synchronous detection method, the slip frequency of the synchronous motor starting is calculated by collecting the induced current of the rotor when the starting winding of the synchronous motor is asynchronously started, so that excitation switching control is performed, and out-of-step detection is performed after the synchronous motor is excited, so that no complex peripheral hardware is required to be added, the manufacturing cost is reduced, interference is not easily caused, and the detection reliability is improved.
In one embodiment, a synchronous motor start sub-synchronization detection apparatus is provided, as shown in fig. 3, including a current data acquisition module 110, a current data filtering module 120, a slip frequency calculation module 130, an excitation control module 140, and an out-of-step detection module 150.
The current data acquiring module 110 is used for acquiring the induced current data detected by the asynchronous starting current detecting device. The induction current data is obtained by detecting the induction current of the rotor when the starting winding of the synchronous motor is asynchronously started by the asynchronous starting current detection device. In one embodiment, the current data obtaining module 110 samples the induced current detected by the asynchronous starting current detecting device according to a preset sampling interval to obtain induced current data. The specific value of the sampling interval is not unique and can be adjusted according to actual requirements.
The current data filtering module 120 is configured to filter the induced current data to obtain filtered current data. In one embodiment, the current data filtering module 120 obtains the filtered data length according to the sampling interval; and filtering the induced current data according to the filtering data length and a preset data threshold value to obtain filtered current data.
The slip frequency calculation module 130 is configured to obtain a slip frequency for starting the synchronous motor according to the filtered current data. In one embodiment, the slip frequency calculation module 130 derives the slip frequency of the synchronous motor start based on the number of filtered current data and the sampling interval.
The excitation control module 140 is configured to perform excitation on the synchronous motor when the filtered current data and the slip frequency satisfy a preset excitation condition. The specific content of the excitation commissioning condition is not unique, and in one embodiment, the excitation commissioning condition includes that the slip frequency is less than or equal to a preset slip threshold, and data greater than a preset data threshold exists in the filtered current data.
The step-out detection module 150 is configured to perform step-out detection on the synchronous motor according to current data acquired and filtered after excitation of the synchronous motor, so as to obtain a detection result. In one embodiment, the step-out detection module 150 determines whether the current data crosses the data threshold value within a preset unit time period and the crossing times reach preset times when the current data acquired and filtered after the synchronous motor excitation is less than a preset data threshold value; if so, the detection result is that the synchronous motor is out of step; if not, the detection result is that the synchronous motor does not generate step loss.
Further, in one embodiment, as shown in fig. 4, the apparatus further comprises an out-of-sync prompt module 160.
The out-of-step prompt module 160 is configured to output motor out-of-step prompt information when the detection result indicates that the synchronous motor is out of step. When the synchronous motor is out of step, the motor out-of-step prompt information is output to give an alarm, so that the staff can know the information and remind the staff to perform corresponding processing, such as stopping, step-up and other measures, and the control reliability of the synchronous motor is improved.
For specific limitations of the synchronous motor start sub-synchronization detection device, reference may be made to the above limitations of the synchronous motor start sub-synchronization detection method, which are not described herein again. The modules in the synchronous motor starting sub-synchronous detection device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
According to the synchronous motor starting sub-synchronous detection device, the slip frequency of the synchronous motor starting is calculated by collecting the induced current of the rotor when the starting winding of the synchronous motor is started asynchronously, then excitation switching control is carried out, and out-of-step detection is carried out after the synchronous motor excitation switching, so that no complex peripheral hardware is required to be added, the manufacturing cost is reduced, interference is not easy to occur, and the detection reliability is improved.
In one embodiment, a synchronous motor starting sub-synchronous detection system is further provided, as shown in fig. 5, comprising an asynchronous starting current detection device 210 and a controller 220, wherein the controller 220 is connected to the asynchronous starting current detection device 210; the asynchronous starting current detection device 210 is disposed in a starting winding of the synchronous motor, and is configured to detect an induced current of a rotor when the starting winding of the synchronous motor starts asynchronously, obtain induced current data, and send the induced current data to the controller 220, where the controller 220 is configured to perform step-out detection on the synchronous motor according to the above-mentioned method. Specifically, the asynchronous starting current detection device 210 may employ a hall sensor. In addition, the synchronous motor starting sub-synchronous detection system may further include an asynchronous starting resistor for detecting an induction current of the rotor when the starting winding of the synchronous motor is asynchronously started by inserting the asynchronous starting resistor into the starting winding of the synchronous motor, and the asynchronous starting current detection means may be provided.
According to the synchronous motor starting sub-synchronous detection system, the slip frequency of the synchronous motor starting is calculated by collecting the induced current of the rotor when the starting winding of the synchronous motor is asynchronously started, so that the excitation switching control is performed, and the out-of-step detection is performed after the synchronous motor excitation switching, so that no complex peripheral hardware is required to be added, the manufacturing cost is reduced, the interference is not easily caused, and the detection reliability is improved.
In order to better understand the method, device and system for detecting the starting sub-synchronization of the synchronous motor, the following detailed explanation is provided in conjunction with specific embodiments. Fig. 6 shows a schematic diagram of asynchronous starting of a synchronous motor, in which:
GZ: is a diode;
out1-Out3 are Hall sensors respectively;
SCR4, two series connected SCR modules;
BU: an excitation voltage transmitter;
PV 1: excitation voltage mechanical meter.
Calculation of the principle of one, asynchronous starting
1: and entering the calculation of the asynchronous starting resistor (normally, the asynchronous starting resistor is provided by a motor manufacturer).
R＝10*ULn/ILn；
ULn is rated exciting voltage of the synchronous motor;
ILn: rated exciting current of the synchronous motor;
as shown in fig. 6, RDF1 and RDF2 are asynchronous starting resistors, where RDF1 is RDF2, and RDF1+ RDF2 is R.
2: and (4) asynchronously starting the model selection calculation of the Hall sensor.
I＝ILn*0.2；
ILn: rated exciting current of the synchronous motor;
i: primary side current of the Hall sensor;
the secondary side current of the Hall sensor can be selected to be 5A or 1A according to requirements.
II, secondly: synchronous motor slip calculation
At regular intervals, the current of the hall sensor, which is mounted in the LEM1 in fig. 6, is sampled. Recording in field use is shown in figure 7.
The sampling point number is filtered by software, and the filtering function is as follows: 1/(cs) the principle is a direct current through a capacitor. The magnitude of the capacitance C is related to the rotor induced current, and is usually set to 0.1 microfarad, with S being the operating factor. The calculation method of the filtering data length is as follows:
N＝0.4/T；
t: a sampling interval;
n is the filtering data length;
0.4 (1/0.4 ═ 2.50) set the filter bandwidth with a slip of 2.50 HZ;
after filtering, a series of data Dn (filtered data) is obtained.
A Data threshold Data is set for interference prevention. Within the data filtering window:
Data<Dn n<N；
Data<D(n-l)(n-l)<N；
the number of counts obtained was: n- (n-l) (filtered data);
the slip frequency of the synchronous motor start is obtained as follows: f ═ 1/(l × T) sampling interval: and T.
Thirdly, the method comprises the following steps: detection of cis-polarity
By detecting a series of data Dn obtained after filtering, the following condition is satisfied
1: the slip frequency is less than or equal to a set slip;
2: data is less than Dn (as long as there is one Data greater than this value);
when both of the above conditions are satisfied, excitation is performed.
Fourthly, the method comprises the following steps: after the synchronous motor is successfully excited
The field sequential slip excitation oscillogram is shown in fig. 8, and it can be seen from the oscillogram of fig. 8 that:
1: after the excitation, the stator current oscillation is slowly reduced and disappears after about 600ms, so that the stable operation is achieved;
2: the rotor current waveform reaches steady operation after about 600 ms.
Fifthly: determination of synchronous motor step loss
After the synchronous motor has been successfully fired asynchronously, it can be seen from fig. 8 that the rotor current is always greater than zero for operation. In operation, the synchronous motor is proved to be out of step by detecting a series of Data Dn obtained after filtering when Data > Dn (N < N) passes through once and three times continuously within 1 second. So that corresponding processing is performed, for example: alarming, stopping reminding, step-by-step and other measures.
The magnitude and the direction of the induced current of the rotor when the starting winding of the synchronous motor is asynchronously started are detected, so that the rotating speed of the motor and the induced direction of the magnetic field of the rotor are judged, and the motor is prompted to be quickly, reliably and safely pulled into synchronization. The method can ensure the forward polarity slip excitation of asynchronous starting of the synchronous motor, and can detect whether the synchronous motor is out of step or not in the running process of the synchronous motor.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for detecting the starting subsynchronization of a synchronous motor, comprising:
acquiring induced current data detected by an asynchronous starting current detection device; the induction current data is obtained by detecting induction current of a rotor when a starting winding of the synchronous motor is asynchronously started by the asynchronous starting current detection device;
filtering the induced current data to obtain filtered current data;
obtaining the starting slip frequency of the synchronous motor according to the filtered current data;
when the filtered current data and the slip frequency meet a preset excitation condition, carrying out excitation on the synchronous motor;
and performing out-of-step detection on the synchronous motor according to current data acquired and filtered after the synchronous motor is excited, so as to obtain a detection result.
2. The method of claim 1, wherein the obtaining of the induced current data detected by the asynchronous starting current detection device comprises sampling the induced current detected by the asynchronous starting current detection device according to a preset sampling interval to obtain the induced current data.
3. The method of claim 2, wherein filtering the induced current data to obtain filtered current data comprises:
obtaining the length of filtering data according to the sampling interval;
and filtering the induced current data according to the filtering data length and a preset data threshold value to obtain filtered current data.
4. The method of claim 3, wherein deriving a slip frequency for synchronous motor starting from the filtered current data comprises:
and obtaining the starting slip frequency of the synchronous motor according to the number of the filtered current data and the sampling interval.
5. The method of claim 1, wherein the excitation firing condition includes a slip frequency being less than or equal to a predetermined slip threshold and wherein the filtered current data includes data greater than a predetermined data threshold.
6. The method of claim 1, wherein detecting the step-out of the synchronous motor according to the current data acquired and filtered after the excitation of the synchronous motor, and obtaining the detection result comprises:
when current data acquired and filtered after excitation of the synchronous motor is smaller than a preset data threshold value, judging whether the current data crosses the data threshold value within a preset unit time period and the crossing times reach preset times; if so, the detection result is that the synchronous motor is out of step; if not, the detection result is that the synchronous motor does not generate step loss.
7. The method according to claim 1, wherein the step-out detection is performed on the synchronous motor according to current data acquired and filtered after the excitation of the synchronous motor, and after a detection result is obtained, the method further comprises:
and outputting motor out-of-step prompt information when the detection result indicates that the synchronous motor is out of step.
8. A synchronous motor start subsynchronous detection apparatus, comprising:
the current data acquisition module is used for acquiring induced current data detected by the asynchronous starting current detection device; the induction current data is obtained by detecting induction current of a rotor when a starting winding of the synchronous motor is asynchronously started by the asynchronous starting current detection device;
the current data filtering module is used for filtering the induced current data to obtain filtered current data;
the slip frequency calculation module is used for obtaining the starting slip frequency of the synchronous motor according to the filtered current data;
the excitation switching control module is used for carrying out excitation switching on the synchronous motor when the filtered current data and the slip frequency meet a preset excitation switching condition;
and the step-out detection module is used for carrying out step-out detection on the synchronous motor according to current data acquired and filtered after the synchronous motor is excited and switched on to obtain a detection result.
9. A synchronous motor starting sub-synchronous detection system is characterized by comprising an asynchronous starting current detection device and a controller, wherein the controller is connected with the asynchronous starting current detection device; the asynchronous starting current detection device is arranged in a starting winding of a synchronous motor and used for detecting induced current of a rotor when the starting winding of the synchronous motor is started asynchronously, obtaining induced current data and sending the induced current data to the controller, and the controller is used for detecting step loss of the synchronous motor according to the method of any one of claims 1 to 7.
10. The system of claim 9, wherein the asynchronous starting current detection device is a hall sensor.
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| US10298168B2 (en) * | 2016-07-07 | 2019-05-21 | Schweitzer Engineering Laboratories, Inc. | Slip-dependent motor model |
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