CN113933057A - Method and system for detecting locked rotor of permanent magnet motor - Google Patents
Method and system for detecting locked rotor of permanent magnet motor Download PDFInfo
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- CN113933057A CN113933057A CN202111019930.8A CN202111019930A CN113933057A CN 113933057 A CN113933057 A CN 113933057A CN 202111019930 A CN202111019930 A CN 202111019930A CN 113933057 A CN113933057 A CN 113933057A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
Abstract
The embodiment of the invention provides a method and a system for detecting locked rotor of a permanent magnet motor. The method for detecting the locked rotor of the permanent magnet motor comprises the following steps: periodically detecting the temperature of a three-phase MOS device in a controller of the permanent magnet motor; when the temperature of any phase of MOS device is detected to rise, drawing a three-phase temperature curve of the three-phase MOS device; and determining whether the permanent magnet motor is locked according to the difference between the three-phase temperature curves. By adopting the technical scheme of the embodiment of the invention, the occurrence of the locked rotor condition of the permanent magnet motor can be timely and accurately detected, so that the MOS device and the motor are prevented from being damaged due to overhigh temperature.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to a method and a system for detecting locked rotor of a permanent magnet motor.
Background
In the use of the permanent magnet motor, the motor is overloaded under complex working conditions due to insufficient power, for example, the motor is locked, alternating current is changed into direct current, in the worst case, the peak value of the alternating current is changed into direct current in actual operation, and the alternating current flows through a MOSFET device and a motor end in a used controller, so that the motor and the controller are irreversibly damaged if the alternating current lasts for a period of time.
At present, most methods for detecting the locked rotor of the motor are realized by detecting the current and the rotating speed of the motor, and the methods can generate false detection under certain special working conditions to cause the abnormal working of the motor.
Disclosure of Invention
The embodiment of the invention provides a method and a system for detecting the locked rotor of a permanent magnet motor, which can timely and accurately detect the state of the motor and improve the accuracy of the locked rotor detection of the permanent magnet motor
The blocking condition of the permanent magnet motor can be timely and accurately detected, so that the MOS device and the motor are prevented from being damaged due to overhigh temperature.
In order to achieve the above object, an embodiment of the present invention provides a method for detecting a locked rotor of a permanent magnet motor, including; periodically detecting the temperature of a three-phase MOS device in a controller of the permanent magnet motor; when the temperature of any phase of MOS device is detected to rise, drawing a three-phase temperature curve of the three-phase MOS device; and determining whether the permanent magnet motor is locked according to the difference between the three-phase temperature curves.
Optionally, determining whether the permanent magnet motor is locked up according to a first difference between the three-phase temperature curves includes: comparing the three-phase temperature curves to obtain a first difference between the three-phase temperature curves; comparing the three-phase temperature curve with a preset three-phase temperature curve template to obtain a second difference between the three-phase temperature curve and the three-phase temperature curve template; and determining whether the permanent magnet motor is locked according to the first difference and the second difference.
Optionally, determining whether the permanent magnet motor is locked according to the first difference and the second difference includes: and when the first difference indicates that the difference value between any two phase temperature curves in the three-phase temperature curves exceeds a first preset threshold value, and the second difference indicates that any one phase in the three-phase temperature curves exceeds a second preset threshold value of the corresponding temperature curve template, determining that the permanent magnet motor is locked.
Optionally, the three-phase temperature curve template is a temperature curve of a three-phase MOS device corresponding to the worst working condition when the permanent magnet motor normally operates.
Optionally, the method further comprises: the three-phase temperature curve is initially compared with a preset three-phase temperature curve template, and timing is started when any one phase temperature curve in the three-phase temperature curve exceeds the corresponding temperature curve template; and when the timing reaches a timing threshold value, comparing the three-phase temperature curve and comparing the three-phase temperature curve with the three-phase temperature curve template.
Optionally, the method further comprises executing a motor stalling processing procedure when it is determined that stalling of the permanent magnet motor occurs.
Optionally, the method further includes exiting the motor stalling processing routine when the temperatures of the three-phase MOS devices are all detected to fall below the threshold.
According to another aspect of the embodiment of the present invention, there is also provided a system for detecting a locked rotor of a permanent magnet motor, the system comprising; the temperature detection device is used for periodically detecting the temperature of a three-phase MOS device in a controller of the permanent magnet motor; the curve drawing module is used for drawing a three-phase temperature curve of the three-phase MOS device when the temperature rise of any one-phase MOS device is detected; and the judging module is used for determining whether the permanent magnet motor is locked according to the difference between the three-phase temperature curves.
Optionally, the determining module includes: the comparison unit is used for comparing the three-phase temperature curves to obtain a first difference between the three-phase temperature curves; comparing the three-phase temperature curve with a preset three-phase temperature curve template to obtain a second difference between the three-phase temperature curve and the three-phase temperature curve template; and the judging unit is used for determining whether the locked rotor of the permanent magnet motor occurs according to the first difference and the second difference.
According to the method and the system for detecting the locked rotor of the permanent magnet motor, provided by the embodiment of the invention, the temperature of the three-phase MOS device in the permanent magnet motor controller is detected, and whether the locked rotor of the motor occurs is judged according to the difference between the temperature curves of the three-phase MOS device, so that the timeliness and the accuracy of the locked rotor detection of the permanent magnet motor are effectively improved; compared with the mode of detecting the motor locked rotor according to the current in the prior art, the method can avoid false detection caused under special working conditions, thereby ensuring that the occurrence of the motor locked rotor condition can be detected and the normal work of the motor is ensured.
Drawings
Fig. 1 is a flowchart of a method for detecting a locked rotor of a permanent magnet motor according to a first embodiment of the present invention;
fig. 2 is a flowchart of a method for detecting a locked rotor of a permanent magnet motor according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a system for detecting a locked rotor of a permanent magnet motor according to a third embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention is provided in conjunction with the accompanying drawings (like numerals indicate like elements throughout the several views) and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
It will be understood by those of skill in the art that the terms "first," "second," and the like in the embodiments of the present invention are used merely to distinguish one element, step, device, module, or the like from another element, and do not denote any particular technical or logical order therebetween.
Example one
Fig. 1 shows a flowchart of a method for detecting a locked-rotor of a permanent magnet motor according to an embodiment of the present invention. The method for detecting the locked rotor of the permanent magnet motor can be used for detecting whether the locked rotor of the permanent magnet motor occurs according to the temperature difference of the three-phase MOS device in the running process of the permanent magnet motor, so that the accuracy of locked rotor detection of the permanent magnet motor is effectively improved.
According to an exemplary embodiment of the present invention, the execution main body of the method for detecting the stalling of the permanent magnet motor may be a permanent magnet motor controller, but it should be understood by those skilled in the art that, in practical applications, any other device having corresponding data acquisition and processing functions may be referred to the embodiment to execute the method for detecting the stalling of the permanent magnet motor. For example, the pm machine stall detection method may be performed using a control device separate from the pm machine controller, or a control unit integrated in the pm machine controller.
As shown in fig. 1, a danger identification method for an industrial vehicle of the present embodiment includes the steps of:
step S101, periodically detecting the temperature of a three-phase MOS device in a controller of the permanent magnet motor.
In the embodiment of the invention, the three-phase MOS device to be detected comprises three MOS devices, in particular to one MOS device in each phase circuit of the permanent magnet motor controller. In performing temperature detection, the temperature of the three-phase MOS device may be detected by providing a temperature detection device such as a thermistor element at the three-phase MOS device, and performing this step, temperature data detected in real time by the temperature detection device may be periodically acquired, and the acquired temperature data may be stored.
And step S102, when the temperature rise of any phase of MOS device is detected, drawing a three-phase temperature curve of the three-phase MOS device.
Optionally, when the temperature of any one of the three-phase MOS devices is determined to rise according to the detected temperature data, a three-phase temperature curve including three temperature curves with time variation is started to be drawn according to the detected temperature data, that is, one temperature curve is drawn for each phase of MOS device.
And S103, determining whether the permanent magnet motor is locked according to the difference between the three-phase temperature curves.
When the motor is locked, the direct current causes unequal currents to pass through the three-phase MOS device, and accordingly, the thermal temperature change of the three-phase MOS device generates difference. Based on this, according to the method for detecting the stalling of the permanent magnet motor in the embodiment of the invention, whether the stalling of the permanent magnet motor occurs is judged according to the difference between the temperature curves of the three-phase MOS devices, which may include the difference between temperature values of corresponding points of the three-phase temperature curves, the difference between slopes of the three-phase temperature curves, and the like, so that the stalling condition of the motor can be accurately detected.
According to the method for detecting the locked rotor of the permanent magnet motor, the temperature of the three-phase MOS device in the permanent magnet motor controller is detected, whether the motor is locked rotor is judged according to the difference between the temperature curves of the three-phase MOS device, and the timeliness and the accuracy of the locked rotor detection of the permanent magnet motor are effectively improved; moreover, compared with the mode of detecting the motor locked rotor according to the current in the prior art, the method can avoid the false detection caused under the special working condition, thereby ensuring the occurrence of the motor locked rotor condition and ensuring the normal work of the motor.
Example two
Fig. 2 shows a flowchart of a method for detecting a stalling of a permanent magnet motor according to a second embodiment of the present invention, which may be regarded as an optional specific implementation manner of the method for detecting a stalling of a permanent magnet motor according to the first embodiment.
As shown in fig. 2, the method for detecting a locked rotor of a permanent magnet motor in the present embodiment includes the following steps:
step S201, recording an initial temperature value.
When the method for detecting the locked rotor of the permanent magnet motor is executed, a temperature value detected by temperature detection equipment is firstly obtained and recorded as an initial temperature value, and the initial temperature value comprises three temperature values respectively corresponding to three-phase MOS devices.
Step S202, the temperature of a three-phase MOS device in a controller of the permanent magnet motor is periodically detected.
In practical application, the preset interval duration for periodically detecting the temperature of the three-phase MOS device may be determined according to an actual working condition of the permanent magnet motor, for example, the preset interval duration may be set to 10 ms. The preset interval duration is not too long so as to avoid reducing the detection timeliness of the permanent magnet motor locked rotor detection method; the preset interval duration is not too small, so as to avoid higher operation complexity caused by a large amount of detection data.
Step S203, recording the detected current temperature value.
And acquiring the current temperature value detected by the temperature detection equipment every preset interval duration, and recording and storing the current temperature value including the current temperature values corresponding to the three-phase MOS devices.
Step S204, judging whether the temperature rises, if so, executing step S205; if the judgment result is no, step S212 is executed.
Specifically, the obtained current temperature value is compared with a previous temperature value (a temperature value recorded before a preset interval duration), and here, three current temperature values corresponding to the three-phase MOS device are respectively compared with three previous temperature values. If the comparison result indicates that the current temperature value of any phase in the three-phase MOS device is greater than the previous temperature value, it is determined that the temperature is increased, that is, if the determination result is yes, step S205 may be continuously performed. If the comparison result indicates that the current temperature value of the three-phase MOS device is not greater than the previous temperature value, it is determined that the temperature is not increased, that is, the determination result is no, and the step S212 can be continuously executed.
And step S205, drawing a three-phase temperature curve.
When the temperature is determined to rise, three temperature curves respectively corresponding to the three-phase MOS device are drawn according to temperature data obtained from the current temperature value to each time after a preset interval duration.
Step S206, carrying out initial temperature comparison, and if the judgment result is yes, executing step S207; if the judgment result is negative, the detection method is ended.
In the embodiment of the invention, the initial temperature comparison refers to comparing the drawn three-phase temperature curve with a preset three-phase temperature curve template respectively so as to judge whether the three-phase temperature curve exceeds the three-phase temperature curve template. If any phase in the three-phase temperature curve exceeds the corresponding temperature curve template, the judgment result is yes, and step S207 can be continuously executed; otherwise, judging whether the result is negative. Specifically, when the temperature value of the phase temperature curve at each detection point exceeds the temperature value of the corresponding temperature curve template at the corresponding detection point, it may be determined that the phase temperature curve exceeds the corresponding temperature curve template.
The three-phase temperature curve template is a temperature curve of a three-phase MOS device corresponding to the worst working condition when the permanent magnet motor normally operates. That is to say, before the method for detecting the stalling of the permanent magnet motor according to the embodiment of the invention is executed, the temperature data of various working conditions corresponding to the normal operation of the permanent magnet motor are obtained in advance, the working condition with the highest temperature value of the three-phase MOS device is determined as the worst working condition, and the temperature curve of the three-phase MOS device corresponding to the worst working condition is drawn and is preset in the permanent magnet motor controller as the three-phase temperature curve template.
In step S207, time counting is started.
Optionally, an internal timer is arranged in the permanent magnet motor controller, and when the judgment result of the initial temperature comparison is yes, the timer is triggered to start timing.
Step S208, judging whether the timing reaches a timing threshold value, if so, executing step S209; if the judgment result is negative, the detection method is ended.
Optionally, a time value timed by the timer is obtained and compared with a preset timing threshold, and if the obtained time value reaches the timing threshold, the judgment result is yes; and if the acquired time value does not reach the timing threshold value, judging that the result is negative. The timing threshold value can be set according to the temperature increase speed of the MOS device and the actual working condition of the permanent magnet motor, so that the temperature of the MOS device is prevented from increasing to damage the MOS device within the time length corresponding to the timing threshold value.
And step S209, comparing the three-phase temperature curves.
In an optional embodiment, this step is performed, and the three-phase temperature curves are respectively compared to obtain a first difference between the three-phase temperature curves; and comparing the three-phase temperature curves with the three-phase temperature curve templates respectively to obtain a second difference between the three-phase temperature curves and the three-phase temperature curve templates, and judging whether the permanent magnet motor is locked according to the first difference and the second difference.
Step S210 determines whether the first difference exceeds a first threshold and whether the second difference exceeds a second threshold. If the judgment result is yes, executing step S211; if the judgment result is negative, the detection method is ended.
The first difference exceeding the first threshold means that the first difference indicates that the difference between any two phase temperature curves in the three-phase temperature curves exceeds the first preset threshold, specifically, the difference between the highest temperature values of any two phase temperature curves exceeds the first preset threshold, of course, the calculation method of the difference between the two phase temperature curves is not limited thereto, and other calculation methods may also be adopted, for example, the difference between the average temperature values of any two phase temperature curves exceeds the first preset threshold, and for example, the difference between the slopes of any two phase temperature curves exceeds the first preset threshold. Here, the first preset threshold may be set according to a calculation manner of the first difference value.
The second difference exceeding the second threshold means that the second difference indicates that any phase in the three-phase temperature curve exceeds the second preset threshold of the corresponding temperature curve template, specifically, the difference between the highest temperature value of any phase temperature curve and the corresponding temperature curve template exceeds the second preset threshold, of course, the calculation method of the difference between the temperature curve and the temperature curve template is not limited thereto, and other calculation methods may also be adopted, for example, the difference between the average temperature value of any phase temperature curve and the corresponding temperature curve template exceeds the second preset threshold, and for example, the difference between the slope of any phase temperature curve and the corresponding temperature curve template exceeds the second preset threshold. Here, the second preset threshold may be set according to a calculation manner of the second difference value.
Executing the step, and when the first difference exceeds the first threshold and the second difference exceeds the second threshold, if the determination result is yes, continuing to execute step S211; otherwise, judging whether the result is negative, and detecting the contact times.
In step S211, a motor stalling process is executed.
That is to say, when the first difference indicates that the difference value between any two temperature curves in the three-phase temperature curves exceeds the first preset threshold value, and the second difference indicates that any one phase in the three-phase temperature curves exceeds the second preset threshold value of the corresponding temperature curve template, the permanent magnet motor is determined to be locked, and the motor locked-rotor processing program is executed. The motor locked-rotor processing procedure can be a shutdown or cooling treatment measure so as to reduce the temperature of the three-phase MOS device and avoid the MOS device, the controller and the motor from being damaged due to overhigh temperature.
Step S212, judging whether to execute the locked rotor processing program, if so, executing step S213; if the judgment result is negative, step S214 is executed.
When it is determined in step S204 that the detected current temperature value does not rise, the step is executed to determine whether a motor stalling process is being executed, and if the motor stalling process is being executed, step S213 is executed; if the motor stalling processing routine is not executed, step S214 is executed.
Step S213, judging whether the three-phase temperature is lower than a threshold value, if so, executing the step S213; if the judgment result is negative, step S214 is executed.
In the process of executing the motor locked-rotor processing program, judging whether the temperature of the three-phase MOS device is lower than a preset temperature threshold value or not according to the obtained current temperature value, and if the current temperature values of the three-phase MOS device are lower than the preset temperature threshold value, judging that the temperature is positive; and if the current temperature value of any one phase of MOS device in the three-phase MOS device is not lower than the preset temperature threshold value, judging whether the current temperature value is not lower than the preset temperature threshold value. The preset temperature threshold is used for judging whether the temperature of the MOS device is reduced to a safe region, and the specific value can be set according to the performance of the MOS device.
Step S214, updating the initial temperature value and updating in time, and ending the detection method.
When the fact that the temperature of the three-phase MOS device is not increased is detected, updating the obtained current temperature value to an initial temperature value; if the timing has started, the timing is stopped and updated.
In step S215, the motor stalling process is exited, and the detection method is ended.
Namely, when the temperature of the three-phase MOS device is detected to be reduced below the preset temperature threshold, the motor stalling processing program is exited.
According to the method for detecting the locked rotor of the permanent magnet motor, provided by the embodiment of the invention, whether the locked rotor of the permanent magnet motor occurs is judged by detecting the temperature of the three-phase MOS device in the permanent magnet motor controller and according to the difference between the temperature curves of the three-phase MOS device and the difference between the temperature curve and a preset temperature curve template, so that the locked rotor condition of the permanent magnet motor can be timely and accurately detected; and, through carrying out motor locked-rotor processing procedure when detecting that permanent-magnet machine takes place the locked-rotor, can avoid the high temperature to cause MOS device and motor to damage to and through when detecting that the temperature of three-phase MOS device is less than the threshold value, withdraw from motor locked-rotor processing procedure for the motor can normally work, guarantees permanent-magnet machine's work efficiency.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a system for detecting stalling of a permanent magnet motor according to a third embodiment of the present invention, where the system for detecting stalling of a permanent magnet motor may be disposed in a controller of the permanent magnet motor, or may be disposed in a control system of an application scenario of the permanent magnet motor in a manner independent of the controller, and is used to execute the method for detecting stalling of a permanent magnet motor according to the first or second embodiment of the present invention.
As shown in fig. 3, a system for detecting a locked rotor of a permanent magnet motor according to an embodiment of the present invention includes:
the temperature detection device 301 is used for periodically detecting the temperature of a three-phase MOS device in a controller of the permanent magnet motor;
an obtaining module 302, configured to obtain temperature data detected by the temperature detecting device 301;
the curve drawing module 303 is configured to draw a three-phase temperature curve of the three-phase MOS device when a temperature rise of any one-phase MOS device is detected;
and the judging module 304 is configured to determine whether the permanent magnet motor is locked according to the difference between the three-phase temperature curves.
Optionally, the determining module 304 includes:
a comparison unit 3041, configured to compare the three-phase temperature curves to obtain a first difference between the three-phase temperature curves; comparing the three-phase temperature curve with a preset three-phase temperature curve template to obtain a second difference between the three-phase temperature curve and the three-phase temperature curve template;
a determining unit 3042, configured to determine whether the permanent magnet motor is locked according to the first difference and the second difference.
Optionally, the judging unit 3042 is configured to: and when the first difference indicates that the difference value between any two phase temperature curves in the three-phase temperature curves exceeds a first preset threshold value, and the second difference indicates that any one phase in the three-phase temperature curves exceeds a second preset threshold value of the corresponding temperature curve template, determining that the permanent magnet motor is locked.
Optionally, the three-phase temperature curve template is a temperature curve of a three-phase MOS device corresponding to the worst working condition when the permanent magnet motor normally operates.
Optionally, the system for detecting a locked-rotor of a permanent magnet motor further includes a timing module 305, configured to initially compare the three-phase temperature curve with a preset three-phase temperature curve template, and start timing when any one phase temperature curve in the three-phase temperature curve exceeds the corresponding temperature curve template;
the comparison unit 3041 is configured to compare the three-phase temperature curve and the three-phase temperature curve template when the timing reaches the timing threshold.
Optionally, the system for detecting a locked rotor of a permanent magnet motor further includes:
and the processing module 306 is configured to execute a motor stalling processing procedure when it is determined that the permanent magnet motor stalls.
Optionally, the processing module 306 is further configured to exit the motor stalling processing procedure when it is detected that the temperatures of the three-phase MOS devices all fall below the preset temperature threshold.
The system for detecting the locked rotor of the permanent magnet motor in the embodiment of the invention is used for realizing the corresponding detection method in the embodiment of the method, has the beneficial effects of the corresponding method embodiment, and is not described again here.
It should be noted that, according to the implementation requirement, each component described in the embodiment of the present invention may be divided into more components, and two or more components or parts of components may be combined into a new component to achieve the purpose of the embodiment of the present invention.
The above embodiments are only for illustrating the embodiments of the present invention and not for limiting the embodiments of the present invention, and those skilled in the art can make various changes, modifications or substitutions without departing from the spirit and scope of the embodiments of the present invention, so that all equivalent technical solutions also belong to the scope of the embodiments of the present invention, and the scope of patent protection of the embodiments of the present invention should be defined by the claims.
Claims (9)
1. A method for detecting the locked rotor of a permanent magnet motor is characterized by comprising the following steps of;
periodically detecting the temperature of a three-phase MOS device in a controller of the permanent magnet motor;
when the temperature of any phase of MOS device is detected to rise, drawing a three-phase temperature curve of the three-phase MOS device;
and determining whether the permanent magnet motor is locked according to the difference between the three-phase temperature curves.
2. The method according to claim 1, wherein the determining whether the permanent magnet motor is locked according to the first difference between the three-phase temperature curves comprises:
comparing the three-phase temperature curves to obtain a first difference between the three-phase temperature curves;
comparing the three-phase temperature curve with a preset three-phase temperature curve template to obtain a second difference between the three-phase temperature curve and the three-phase temperature curve template;
and determining whether the permanent magnet motor is locked according to the first difference and the second difference.
3. The method according to claim 2, wherein the determining whether the pm machine is locked according to the first difference and the second difference comprises:
and when the first difference indicates that the difference value between any two phase temperature curves in the three-phase temperature curves exceeds a first preset threshold value, and the second difference indicates that any phase in the three-phase temperature curves exceeds a second preset threshold value of the corresponding temperature curve template, determining that the permanent magnet motor is locked.
4. The method for detecting the locked rotor of the permanent magnet motor according to claim 2, wherein the three-phase temperature curve template is a temperature curve of a three-phase MOS device corresponding to the worst working condition when the permanent magnet motor normally operates.
5. The method of claim 2, further comprising:
the three-phase temperature curve is initially compared with a preset three-phase temperature curve template, and timing is started when any one phase temperature curve in the three-phase temperature curve exceeds the corresponding temperature curve template;
and when the timing reaches a timing threshold value, comparing the three-phase temperature curve and comparing the three-phase temperature curve with the three-phase temperature curve template.
6. The method according to any one of claims 1-5, wherein the method further comprises:
and executing a motor locked-rotor processing program when the permanent magnet motor is determined to be locked-rotor.
7. The method of claim 6, further comprising:
and when the temperature of the three-phase MOS device is detected to be reduced below a preset temperature threshold, exiting the motor locked-rotor processing program.
8. A system for detecting the locked rotor of a permanent magnet motor is characterized by comprising a detection module, a detection module and a control module, wherein the detection module is used for detecting the locked rotor of the permanent magnet motor;
the temperature detection device is used for periodically detecting the temperature of a three-phase MOS device in a controller of the permanent magnet motor;
the curve drawing module is used for drawing a three-phase temperature curve of the three-phase MOS device when the temperature rise of any one-phase MOS device is detected;
and the judging module is used for determining whether the permanent magnet motor is locked according to the difference between the three-phase temperature curves.
9. The system according to claim 8, wherein the determining module comprises:
the comparison unit is used for comparing the three-phase temperature curves to obtain a first difference between the three-phase temperature curves; comparing the three-phase temperature curve with a preset three-phase temperature curve template to obtain a second difference between the three-phase temperature curve and the three-phase temperature curve template;
and the judging unit is used for determining whether the locked rotor of the permanent magnet motor occurs according to the first difference and the second difference.
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