CN111510039B - Method, device and equipment for preventing overcurrent of three-phase motor and storage medium - Google Patents
Method, device and equipment for preventing overcurrent of three-phase motor and storage medium Download PDFInfo
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- CN111510039B CN111510039B CN202010247335.9A CN202010247335A CN111510039B CN 111510039 B CN111510039 B CN 111510039B CN 202010247335 A CN202010247335 A CN 202010247335A CN 111510039 B CN111510039 B CN 111510039B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
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Abstract
The invention discloses a method for preventing overcurrent of a three-phase motor, which comprises the following steps: performing reverse Park conversion and reverse Clark conversion on the acquired D-axis required current and Q-axis required current to obtain three-phase current of the motor; when the three-phase current exceeds a preset three-phase current threshold value, correcting the three-phase current to obtain a corrected three-phase current; performing Park conversion and Clark conversion on the corrected three-phase current to obtain a corrected D-axis required current and a corrected Q-axis required current; when the absolute value of the rotating speed of the motor is smaller than a preset rotating speed threshold value, outputting the corrected D-axis required current and Q-axis required current; and when the absolute value of the rotating speed of the motor is greater than the preset rotating speed threshold value, the D-axis required current and the Q-axis required current are obtained again according to the formula, and all the steps are repeatedly executed. By the method, overcurrent faults of the motor can be avoided.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to a method, a device, equipment and a storage medium for preventing a three-phase motor from overcurrent.
Background
Under the working conditions of rapid acceleration, rapid deceleration and rapid motor speed regulation change of the whole vehicle, the current overcurrent fault of the motor phase easily occurs, and when the overcurrent fault occurs, the driving and riding experience of customers is seriously influenced, and serious potential safety hazards can be brought.
In the prior art, after an instruction required by a finished automobile is received, required D-axis current and Q-axis current can be directly obtained by inquiring a torque-rotating speed-D-axis ammeter and a torque-rotating speed-Q-axis ammeter, or the required D-axis current and Q-axis current can be directly obtained through formula calculation, and then modulation signals are output after PID (proportion integration differentiation) regulation and SVPWM (space vector pulse width modulation) algorithm, so that the action of a motor is controlled. However, in the current method, the D-axis current and the Q-axis current are directly obtained according to table lookup or calculation, and then subsequent calculation is directly performed, and whether the required D-axis current and Q-axis current are reasonable or not is not judged, so that phase current overcurrent faults are easy to occur, and potential safety hazards exist.
Disclosure of Invention
The embodiment of the disclosure provides a method, a device, equipment and a storage medium for preventing a three-phase motor from overcurrent. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
In some optional embodiments, a method of preventing overcurrent in a three-phase motor, comprises:
performing reverse Park conversion and reverse Clark conversion on the acquired D-axis required current and Q-axis required current to obtain three-phase current of the motor;
when the three-phase current exceeds a preset three-phase current threshold value, correcting the three-phase current to obtain a corrected three-phase current;
performing Park conversion and Clark conversion on the corrected three-phase current to obtain a corrected D-axis required current and a corrected Q-axis required current;
when the absolute value of the rotating speed of the motor is smaller than a preset rotating speed threshold value, outputting the corrected D-axis required current and Q-axis required current;
and when the absolute value of the rotating speed of the motor is greater than the preset rotating speed threshold value, the D-axis required current and the Q-axis required current are obtained again according to the formula, and all the steps are repeatedly executed.
Further, before performing inverse Park transformation and inverse Clark transformation on the acquired D-axis demand current and Q-axis demand current, the method further includes:
and acquiring the D-axis required current and the Q-axis required current.
Further, when the three-phase current does not exceed the preset three-phase current threshold, the method further comprises the following steps:
and outputting the acquired D-axis required current and the acquired Q-axis required current.
Further, modifying the three-phase current includes:
the phase current which does not exceed the preset three-phase current threshold value is kept unchanged;
and re-assigning the phase currents exceeding the preset three-phase current threshold value, and ensuring that the sum of the corrected three-phase currents is zero.
Further, the obtaining of the D-axis demand current and the Q-axis demand current again according to the formula comprises:
and acquiring the D-axis required current and the Q-axis required current again according to the following formula:
Id＝min(Id’，Id)
and Id is the D-axis required current, Iq is the Q-axis required current, Id 'is the corrected D-axis required current, and Iq' is the corrected Q-axis required current.
In some optional embodiments, an apparatus for preventing overcurrent in a three-phase motor includes:
the first conversion module is used for performing reverse Park conversion and reverse Clark conversion on the acquired D-axis required current and Q-axis required current to obtain three-phase current of the motor;
the correction module is used for correcting the three-phase current when the three-phase current exceeds a preset three-phase current threshold value to obtain a corrected three-phase current;
the second conversion module is used for carrying out Park conversion and Clark conversion on the corrected three-phase current to obtain the corrected D-axis required current and Q-axis required current;
the first output module is used for outputting the corrected D-axis required current and Q-axis required current when the absolute value of the rotating speed of the motor is smaller than a preset rotating speed threshold;
and the first acquisition module is used for acquiring the D-axis required current and the Q-axis required current again according to a formula and repeatedly executing all the steps when the absolute value of the rotating speed of the motor is greater than a preset rotating speed threshold value.
Further, still include:
and the second acquisition module is used for acquiring the D-axis required current and the Q-axis required current before carrying out reverse Park conversion and reverse Clark conversion on the acquired D-axis required current and the acquired Q-axis required current.
Further, still include:
and the second output module is used for outputting the acquired D-axis required current and Q-axis required current when the three-phase current does not exceed the preset three-phase current threshold.
In some optional embodiments, an apparatus for preventing overcurrent of a three-phase motor comprises a processor and a memory storing program instructions, wherein the processor is configured to execute the method for preventing overcurrent of a three-phase motor provided by the above embodiments when executing the program instructions.
In some optional embodiments, a computer readable medium having computer readable instructions stored thereon, the computer readable instructions being executable by a processor to implement a method of preventing overcurrent in a three-phase motor provided by the above embodiments.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the invention provides a method for preventing overcurrent of a three-phase motor, which is characterized in that a prejudgment step is added before the acquired required current is input into the next calculation link, namely, whether the acquired required current is reasonable or not is judged, the required current is corrected under the unreasonable condition, and the corrected required current is input into the subsequent calculation link.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic flow diagram illustrating a method of preventing overcurrent in a three-phase motor in accordance with an exemplary embodiment;
FIG. 2 is a schematic flow diagram illustrating a method of preventing overcurrent in a three-phase motor in accordance with an exemplary embodiment;
fig. 3 is a schematic structural view illustrating an apparatus for preventing overcurrent of a three-phase motor according to an exemplary embodiment;
fig. 4 is a schematic structural diagram illustrating an apparatus for preventing overcurrent in a three-phase motor according to an exemplary embodiment.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The first embodiment is as follows:
the embodiment of the disclosure provides a method for preventing a three-phase motor from overcurrent, and fig. 1 is a schematic flow chart illustrating the method for preventing the three-phase motor from overcurrent according to an exemplary embodiment.
As shown in fig. 1, a method for preventing overcurrent in a three-phase motor includes:
s101, performing reverse Park conversion and reverse Clark conversion on the acquired D-axis required current and the acquired Q-axis required current to obtain three-phase current of the motor;
specifically, before performing inverse Park transformation and inverse Clark transformation on the acquired D-axis required current and Q-axis required current, the method further includes acquiring D-axis required current and Q-axis required current of the motor, wherein the required D-axis current and Q-axis current can be directly obtained by querying a torque-rotating speed-D-axis ammeter and a torque-rotating speed-Q-axis ammeter, or the D-axis current and the Q-axis current can be directly obtained by formula calculation.
And (3) carrying out inverse Park transformation and inverse Clark transformation on the obtained D-axis current and Q-axis current to obtain three-phase currents Iu, Iv and Iw of the motor, and calculating as follows:
wherein Iu, Iv and Iw are three-phase currents of the motor, I α and I β are D-Q axis currents in a stationary coordinate system, Id is a D axis required current, and Iq is a Q axis required current.
S102, when the three-phase current exceeds a preset three-phase current threshold value, correcting the three-phase current to obtain a corrected three-phase current;
specifically, after the three-phase current of the motor is obtained, whether the three-phase current exceeds a three-phase current threshold value is judged, and a threshold value user can determine the three-phase current according to actual conditions.
When any phase current in the three-phase current does not exceed the phase current threshold, the acquired D-axis required current and Q-axis required current can be directly output.
And when any phase current in the three-phase current exceeds a phase current threshold value, correcting the three-phase current to obtain the corrected three-phase current. Further, modifying the three-phase current includes: and keeping the phase current which does not exceed the preset three-phase current threshold unchanged, re-assigning the phase current which exceeds the preset three-phase current threshold, and ensuring that the sum of the corrected three-phase currents is zero. And re-assigning values to the phase currents exceeding the preset three-phase current threshold value by referring to the preset phase current threshold value.
Through this step, the corrected three-phase current can be obtained.
S103, carrying out Park conversion and Clark conversion on the corrected three-phase current to obtain a corrected D-axis required current and a corrected Q-axis required current;
the required current is corrected under the unreasonable condition, and the corrected required current is input into a subsequent calculation link, so that overcurrent faults of the three-phase motor can be effectively avoided.
S104, when the absolute value of the rotating speed of the motor is smaller than a preset rotating speed threshold value, outputting the corrected D-axis required current and Q-axis required current;
specifically, after the corrected D-axis required current and the corrected Q-axis required current are obtained, the motor rotating speed is combined for further judgment, and when the absolute value of the rotating speed of the motor is smaller than a preset rotating speed threshold, the corrected D-axis required current and the corrected Q-axis required current can be directly output. Wherein, the rotating speed threshold value user can be determined according to the actual situation.
And S105, when the absolute value of the rotating speed of the motor is greater than the preset rotating speed threshold value, acquiring the D-axis required current and the Q-axis required current again according to the formula, and repeatedly executing all the steps.
Specifically, when the absolute value of the rotation speed of the motor is greater than the preset rotation speed threshold, the D-axis required current and the Q-axis required current are re-acquired according to the formula, and after the re-acquired D-axis required current and Q-axis required current are obtained, the step S101 is returned to, and all the steps are continuously executed.
Wherein the D-axis demand current and the Q-axis demand current can be reacquired according to the following formulas:
Id＝min(Id’，Id)
and Id is the D-axis required current, Iq is the Q-axis required current, Id 'is the corrected D-axis required current, and Iq' is the corrected Q-axis required current.
Further, before performing inverse Park transformation and inverse Clark transformation on the acquired D-axis demand current and Q-axis demand current, the method further includes:
and acquiring the D-axis required current and the Q-axis required current. The required D-axis current and Q-axis current can be directly obtained by inquiring the torque-rotating speed-D-axis ammeter and the torque-rotating speed-Q-axis ammeter, or the D-axis current and the Q-axis current can be directly obtained through formula calculation.
Further, when the three-phase current does not exceed the preset three-phase current threshold, the method further comprises the following steps:
and outputting the acquired D-axis required current and the acquired Q-axis required current.
Further, modifying the three-phase current includes:
the phase current which does not exceed the preset three-phase current threshold value is kept unchanged;
and re-assigning the phase currents exceeding the preset three-phase current threshold value, and ensuring that the sum of the corrected three-phase currents is zero.
Further, the obtaining of the D-axis demand current and the Q-axis demand current again according to the formula comprises:
and acquiring the D-axis required current and the Q-axis required current again according to the following formula:
Id＝min(Id’，Id)
and Id is the D-axis required current, Iq is the Q-axis required current, Id 'is the corrected D-axis required current, and Iq' is the corrected Q-axis required current.
According to the method provided by the disclosed embodiment, a prejudging step is added before the acquired required current is input into the next calculating link, namely whether the acquired required current is reasonable or not is judged, the required current is corrected under the unreasonable condition, and the corrected required current is input into the subsequent calculating link.
Example two:
the embodiment of the disclosure provides a method for preventing a three-phase motor from overcurrent, and fig. 2 is a schematic flow chart illustrating the method for preventing the three-phase motor from overcurrent according to an exemplary embodiment.
As shown in fig. 2, a method for preventing overcurrent in a three-phase motor includes:
step 1: the required D-axis current and Q-axis current are directly obtained by inquiring the torque-rotating speed-D-axis ammeter and the torque-rotating speed-Q-axis ammeter, or the required D-axis current and the required Q-axis current are directly obtained through formula calculation.
Step 2: and performing inverse Park transformation and inverse Clark transformation on the acquired D-axis required current and Q-axis required current to obtain three-phase currents Iu, Iv and Iw of the motor.
And step 3: judging whether any phase current of three-phase currents Iu, Iv and Iw of the motor exceeds a preset phase current threshold value, outputting the acquired D-axis demand current and Q-axis demand current when any phase current of the three-phase currents Iu, Iv and Iw of the motor does not exceed the preset phase current threshold value, and correcting the phase current value when any phase current of the three-phase currents Iu, Iv and Iw of the motor exceeds the preset phase current threshold value to obtain the corrected three-phase current. Further, modifying the three-phase current includes: and keeping the phase current which does not exceed the preset three-phase current threshold unchanged, re-assigning the phase current which exceeds the preset three-phase current threshold, and ensuring that the sum of the corrected three-phase currents is zero. And re-assigning values to the phase currents exceeding the preset three-phase current threshold value by referring to the preset phase current threshold value.
And 4, step 4: and carrying out Park conversion and Clark conversion on the corrected three-phase current to obtain the corrected D-axis required current and Q-axis required current.
And 5: judging whether the rotating speed value of the motor is smaller than a preset motor rotating speed threshold value or not, directly outputting the corrected D-axis required current and Q-axis required current when the rotating speed absolute value of the motor is smaller than the preset rotating speed threshold value, reacquiring the D-axis required current and the Q-axis required current according to a formula when the rotating speed absolute value of the motor is larger than the preset rotating speed threshold value, and returning to the step 2 to continuously execute all the steps after reacquiring the D-axis required current and the Q-axis required current.
Wherein the D-axis demand current and the Q-axis demand current can be reacquired according to the following formulas:
Id＝min(Id’，Id)
and Id is the D-axis required current, Iq is the Q-axis required current, Id 'is the corrected D-axis required current, and Iq' is the corrected Q-axis required current.
According to the method provided by the disclosed embodiment, the overcurrent fault of the three-phase motor can be effectively avoided.
Example three:
the embodiment of the present disclosure provides a device for preventing a three-phase motor from overcurrent, and fig. 3 is a schematic structural diagram illustrating the device for preventing the three-phase motor from overcurrent according to an exemplary embodiment.
As shown in fig. 3, in an embodiment of the present disclosure, an apparatus for preventing an overcurrent in a three-phase motor includes:
the first conversion module is used for performing reverse Park conversion and reverse Clark conversion on the acquired D-axis required current and Q-axis required current to obtain three-phase current of the motor;
the S302 correction module is used for correcting the three-phase current when the three-phase current exceeds a preset three-phase current threshold value to obtain a corrected three-phase current;
s303, a second conversion module is used for carrying out Park conversion and Clark conversion on the corrected three-phase current to obtain the corrected D-axis required current and Q-axis required current;
the S304 output module is used for outputting the corrected D-axis required current and Q-axis required current when the absolute value of the rotating speed of the motor is smaller than a preset rotating speed threshold;
s305, a first obtaining module, configured to obtain the D-axis required current and the Q-axis required current again according to the formula when the absolute value of the rotation speed of the motor is greater than a preset rotation speed threshold, and repeatedly execute all the steps.
Further, the device for preventing overcurrent of a three-phase motor in the embodiment of the present disclosure further includes:
and the second acquisition module is used for acquiring the D-axis required current and the Q-axis required current before carrying out reverse Park conversion and reverse Clark conversion on the acquired D-axis required current and the acquired Q-axis required current.
Further, the device for preventing overcurrent of a three-phase motor in the embodiment of the present disclosure further includes:
and the second output module is used for outputting the acquired D-axis required current and Q-axis required current when the three-phase current does not exceed the preset three-phase current threshold.
According to the device provided by the disclosed embodiment, a prejudging step is added before the acquired required current is input into the next calculating link, namely whether the acquired required current is reasonable or not is judged, the required current is corrected under an unreasonable condition, and the corrected required current is input into the subsequent calculating link.
Example four:
fig. 4 is a schematic structural diagram illustrating an apparatus for preventing overcurrent in a three-phase motor according to an exemplary embodiment. In the disclosed embodiment, the apparatus for preventing overcurrent of a three-phase motor includes a processor 41 and a memory 42 storing program instructions, and may further include a communication interface 43 and a bus 44. The processor 41, the communication interface 43, and the memory 42 may communicate with each other via a bus 44. The communication interface 43 may be used for information transfer. Processor 41 may invoke logic instructions in memory 42 to perform the method of preventing overcurrent of a three-phase motor provided by the above-described embodiments.
Example five:
the embodiment of the disclosure provides a computer readable medium, on which computer readable instructions are stored, and the computer readable instructions can be executed by a processor to realize the method for preventing the overcurrent of the three-phase motor provided by the embodiment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A method of preventing overcurrent in a three-phase motor, comprising:
performing reverse Park conversion and reverse Clark conversion on the acquired D-axis required current and Q-axis required current to obtain three-phase current of the motor;
when the three-phase current exceeds a preset three-phase current threshold value, correcting the three-phase current to obtain a corrected three-phase current;
performing Park conversion and Clark conversion on the corrected three-phase current to obtain a corrected D-axis required current and a corrected Q-axis required current;
when the absolute value of the rotating speed of the motor is smaller than a preset rotating speed threshold value, outputting the corrected D-axis required current and Q-axis required current;
when the absolute value of the rotating speed of the motor is larger than a preset rotating speed threshold value, acquiring the D-axis required current and the Q-axis required current again according to a formula, and repeatedly executing all the steps;
and acquiring the D-axis required current and the Q-axis required current again according to the following formula:
Id＝min(Id’，Id)
and Id is the D-axis required current, Iq is the Q-axis required current, Id 'is the corrected D-axis required current, and Iq' is the corrected Q-axis required current.
2. The method according to claim 1, wherein before performing inverse Park transformation and inverse Clark transformation on the acquired D-axis demand current and Q-axis demand current, the method further comprises:
and acquiring the D-axis required current and the Q-axis required current.
3. The method of claim 1, further comprising, when the three-phase current does not exceed a preset three-phase current threshold:
and outputting the acquired D-axis required current and the acquired Q-axis required current.
4. The method of claim 1, wherein the modifying the three-phase current comprises:
and re-assigning the three-phase current according to the preset three-phase current threshold value, and ensuring that the sum of the corrected three-phase currents is zero.
5. A device for preventing overcurrent of a three-phase motor, comprising:
the first conversion module is used for performing reverse Park conversion and reverse Clark conversion on the acquired D-axis required current and Q-axis required current to obtain three-phase current of the motor;
the correction module is used for correcting the three-phase current to obtain a corrected three-phase current when the three-phase current exceeds a preset three-phase current threshold;
the second conversion module is used for carrying out Park conversion and Clark conversion on the corrected three-phase current to obtain a corrected D-axis required current and a corrected Q-axis required current;
the first output module is used for outputting the corrected D-axis demand current and Q-axis demand current when the absolute value of the rotating speed of the motor is smaller than a preset rotating speed threshold;
the first acquisition module is used for acquiring the D-axis required current and the Q-axis required current again according to a formula and repeatedly executing all the steps when the absolute value of the rotating speed of the motor is greater than a preset rotating speed threshold;
and acquiring the D-axis required current and the Q-axis required current again according to the following formula:
Id＝min(Id’，Id)
and Id is the D-axis required current, Iq is the Q-axis required current, Id 'is the corrected D-axis required current, and Iq' is the corrected Q-axis required current.
6. The apparatus of claim 5, further comprising:
and the second acquisition module is used for acquiring the D-axis required current and the Q-axis required current before carrying out reverse Park conversion and reverse Clark conversion on the acquired D-axis required current and the acquired Q-axis required current.
7. The apparatus of claim 5, further comprising:
and the second output module is used for outputting the acquired D-axis required current and Q-axis required current when the three-phase current does not exceed a preset three-phase current threshold.
8. An apparatus for preventing overcurrent in a three-phase motor, comprising a processor and a memory storing program instructions, the processor being configured to carry out the method of any one of claims 1 to 4 when executing the program instructions.
9. A computer readable medium having computer readable instructions stored thereon which are executable by a processor to implement a method of preventing overcurrent in a three-phase motor as claimed in any one of claims 1 to 4.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1677836A (en) * | 2004-03-30 | 2005-10-05 | 日本伺服株式会社 | Stepping motor driver |
| CN101039093A (en) * | 2006-03-15 | 2007-09-19 | 株式会社日立制作所 | Vektorsteuerungsvorrichtung fur dauermagnetmotor |
| JP2009005515A (en) * | 2007-06-22 | 2009-01-08 | Sanyo Electric Co Ltd | Motor control unit, and compressor |
| CN103166559A (en) * | 2011-12-16 | 2013-06-19 | 三菱电机株式会社 | Controller |
-
2020
- 2020-03-31 CN CN202010247335.9A patent/CN111510039B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1677836A (en) * | 2004-03-30 | 2005-10-05 | 日本伺服株式会社 | Stepping motor driver |
| CN101039093A (en) * | 2006-03-15 | 2007-09-19 | 株式会社日立制作所 | Vektorsteuerungsvorrichtung fur dauermagnetmotor |
| JP2009005515A (en) * | 2007-06-22 | 2009-01-08 | Sanyo Electric Co Ltd | Motor control unit, and compressor |
| CN103166559A (en) * | 2011-12-16 | 2013-06-19 | 三菱电机株式会社 | Controller |
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