CN111366844A - Vehicle, motor drive control system, and method and device for detecting phase failure of motor - Google Patents
Vehicle, motor drive control system, and method and device for detecting phase failure of motor Download PDFInfo
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Abstract
The invention provides a vehicle, a motor drive control system, a motor open-phase detection method and a device, wherein the method comprises the following steps: acquiring the rotating speed of the motor and acquiring the current torque of the motor; when the rotating speed of the motor is in a high rotating speed interval and the current torque of the motor is larger than the phase-lack detection torque, the three-phase current of the motor is obtained, and whether the phase-lack fault occurs to the motor is judged according to the current torque of the motor and the three-phase current of the motor, so that the phase-lack can be detected through the torque and the current of the motor, whether various phase-lack faults exist in the motor can be accurately detected, for example, the multiphase phase-lack fault exists, the motor is effectively protected, and the motor is prevented from being damaged. And moreover, defects are detected in a software mode, and a phase-lack protection circuit is not additionally arranged, so that the detection cost is saved.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to a motor open-phase detection method, a motor open-phase detection device, a motor drive control system and a vehicle.
Background
When a three-phase motor is in single-phase or multi-phase failure, the electronic current is increased rapidly, the magnetic field is seriously uneven, and the motor is abnormal in shaking, weak in rotation, reduced in loading performance and high in noise. Severe conditions can cause short circuits in the motor, burning the motor.
The related art proposes a method for detecting a phase loss of a motor by detecting an unbalance of three-phase currents. However, the present inventors have found that the related art has a problem in that if a multi-phase loss occurs, for example, if no current flows in three phases, it is impossible to detect whether the phase loss occurs. In addition, the related technology detects the phase failure by adding the phase failure protection circuit, and the cost is higher.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first object of the present invention is to provide a phase-loss detection method for an electric motor, which can accurately detect whether various phase-loss faults, such as a multi-phase-loss fault, exist in the electric motor.
A second object of the present invention is to provide a phase loss detection apparatus for an electric motor.
A third object of the present invention is to provide a motor drive control system.
A fourth object of the invention is to propose a vehicle.
In order to achieve the above object, a method for detecting a phase failure of an electric machine according to an embodiment of a first aspect of the present invention includes the following steps: acquiring the rotating speed of the motor and acquiring the current torque of the motor; when the rotating speed of the motor is in a high rotating speed interval and the current torque of the motor is larger than the phase-lack detection torque, the three-phase current of the motor is obtained, and whether the phase-lack fault occurs to the motor is judged according to the current torque of the motor and the three-phase current of the motor.
According to the phase-lack detection method of the motor, when the rotating speed of the motor is in a high rotating speed section and the current torque of the motor is larger than the phase-lack detection torque, the three-phase current of the motor is obtained, and whether the phase-lack fault occurs in the motor is judged according to the current torque of the motor and the three-phase current of the motor. Therefore, the phase loss is detected through the torque and the current of the motor, whether various phase loss faults exist in the motor or not can be accurately detected, for example, the multiphase phase loss fault is detected, the motor is effectively protected, and the motor is prevented from being damaged. In addition, the method of the embodiment of the invention detects the open phase by a software mode without additionally adding an open phase protection circuit, thereby saving the detection cost.
According to one embodiment of the invention, judging whether the motor has a phase-lack fault according to the current torque of the motor and the three-phase current of the motor comprises the following steps: determining corresponding open-phase detection current according to the current torque of the motor; and if the phase currents of the three phases of the motor are all smaller than the corresponding phase-lack detection currents, judging that the motor has a phase-lack fault.
According to an embodiment of the present invention, the method for detecting a phase loss of a motor further includes: if the rotating speed of the motor is in a low rotating speed interval, acquiring three-phase voltage and three-phase current of the motor; and judging whether the motor has a phase-lack fault according to the three-phase voltage and the three-phase current of the motor.
According to an embodiment of the present invention, the determining whether the motor has a phase-lack fault according to three-phase voltages and three-phase currents of the motor includes: and if the phase voltage of any phase of the motor is greater than a preset voltage threshold and the phase current is less than a preset current threshold, judging that a phase-lack fault occurs in any phase of the motor.
According to one embodiment of the invention, when the rotating speed of the motor is greater than a preset rotating speed, the rotating speed of the motor is determined to be in a high rotating speed interval; and when the rotating speed of the motor is less than or equal to the preset rotating speed, determining that the rotating speed of the motor is in a low rotating speed interval.
In order to achieve the above object, an embodiment of a second aspect of the present invention provides a phase-loss detection apparatus for an electric motor, including: the first acquisition module is used for acquiring the rotating speed of the motor; the second acquisition module is used for acquiring the current torque of the motor; the third acquisition module is used for acquiring three-phase current of the motor; and the control module is used for acquiring the three-phase current of the motor when the rotating speed of the motor is in a high rotating speed interval and the current torque of the motor is greater than the phase-lack detection torque, and judging whether the phase-lack fault occurs to the motor according to the current torque of the motor and the three-phase current of the motor.
According to the open-phase detection device of the motor, provided by the embodiment of the invention, the control module acquires the three-phase current of the motor when the rotating speed of the motor is in a high rotating speed section and the current torque of the motor is greater than the open-phase detection torque, and judges whether the open-phase fault occurs to the motor according to the current torque of the motor and the three-phase current of the motor. Therefore, the phase loss is detected through the torque and the current of the motor, whether various phase loss faults exist in the motor or not can be accurately detected, for example, the multiphase phase loss fault is detected, the motor is effectively protected, and the motor is prevented from being damaged. In addition, the device provided by the embodiment of the invention detects the defects in a software mode, and a phase-lack protection circuit is not additionally arranged, so that the detection cost is saved.
According to an embodiment of the present invention, the control module is further configured to determine a corresponding open-phase detection current according to a current torque of the motor, and determine that a open-phase fault occurs in the motor when phase currents of three phases of the motor are all smaller than the corresponding open-phase detection current.
According to an embodiment of the present invention, the apparatus for detecting a phase failure of a motor further includes: the fourth acquisition module acquires three-phase voltage of the motor; the control module is used for judging whether the motor has a phase-lack fault according to three-phase voltage and three-phase current of the motor when the rotating speed of the motor is in a low rotating speed interval.
According to an embodiment of the present invention, the control module is further configured to determine that a phase-missing fault occurs in any phase of the motor when a phase voltage of any phase of the motor is greater than a preset voltage threshold and a phase current is less than a preset current threshold.
According to an embodiment of the present invention, the control module is further configured to determine that the rotation speed of the motor is in a high rotation speed interval when the rotation speed of the motor is greater than a preset rotation speed, and determine that the rotation speed of the motor is in a low rotation speed interval when the rotation speed of the motor is less than or equal to the preset rotation speed.
To achieve the above object, an embodiment of a third aspect of the present invention provides a motor drive control system including the phase-loss detection device for a motor.
To achieve the above object, an embodiment of a fourth aspect of the present invention proposes a vehicle including the motor drive control system.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a phase loss detection method of a motor according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for determining a phase loss fault from motor torque and three phase current according to one embodiment of the present invention;
FIG. 3 is a flow chart of a method of phase loss detection for an electric machine according to one embodiment of the present invention;
FIG. 4 is a block diagram of a motor phase loss detection apparatus according to an embodiment of the present invention;
fig. 5 is a block diagram schematically illustrating a phase loss detection apparatus of a motor according to still another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The method for detecting the phase loss of the motor in the related art will be briefly described below.
The phase loss means that one phase or multiple phases in a three-phase circuit of the motor controller cannot work normally. The three-phase motor can have open-phase faults due to poor contact, fuse fusing and the like, and if the motor runs in an open-phase mode, the motor can shake abnormally, rotate powerless, the on-load performance is reduced, the noise is large, and even the motor can be short-circuited and burnt in severe conditions.
For this reason, the related art proposes a method of detecting a phase loss of the motor by detecting an unbalance of three-phase currents. However, the inventor of the present application has found that the related art has a problem in that it is impossible to accurately detect a phase loss fault in multiple phases, for example, if none of the three phases has a current, it is impossible to detect whether a phase loss occurs.
In addition, in the related technology, the additional contactor and the thermal relay are used for open-phase protection, the contactor can protect two phases of the external contactor from being automatically disconnected in the open-phase process, and the thermal relay can cut off the contactor to protect a circuit in the overcurrent process. However, the extra protection circuit increases the detection cost.
Based on this, the embodiment of the invention provides a motor drive control system, and a method and a device for detecting a phase failure of a motor.
A phase-loss detection method of a motor and a phase-loss detection apparatus of a motor according to an embodiment of the present invention are described below with reference to the drawings.
Fig. 1 is a flowchart of a phase loss detection method of a motor according to an embodiment of the present invention. In the embodiment of the invention, when the motor runs at a high speed, the torque and the current of the motor are acquired, and then the open-phase fault of the motor during running is judged by comparing the torque and the current, so that various open-phase faults, such as multi-phase open-phase faults, existing in the motor are accurately detected.
Specifically, as shown in fig. 1, the method for detecting a phase loss of a motor includes the steps of:
s101: and acquiring the rotating speed of the motor and acquiring the current torque of the motor.
The current torque of the motor can be an execution torque sent to the motor controller by the vehicle control unit. For example, the execution torque of the motor may be calculated from the driving force required by the vehicle, and may be directly used as the current torque of the motor in the present embodiment.
S103: when the rotating speed of the motor is in a high rotating speed interval and the current torque of the motor is larger than the phase-lack detection torque, the three-phase current of the motor is obtained, and whether the phase-lack fault occurs to the motor is judged according to the current torque of the motor and the three-phase current of the motor.
Specifically, when the rotating speed of the motor is greater than the preset rotating speed, the rotating speed of the motor is determined to be in a high rotating speed interval.
As an example, the current three-phase current of the motor may be obtained by a hall sensor. .
In some embodiments of the present invention, the motor controller in the vehicle acquires and stores the torque of the motor and the three-phase current of the motor in real time, so that the torque of the motor and the three-phase current of the motor can be directly acquired by communicating with the motor controller when the phase loss detection is performed.
According to an embodiment of the present invention, as shown in fig. 2, the determining whether the motor has a phase-loss fault according to the current torque of the motor and the three-phase current of the motor includes:
s201: and determining corresponding open-phase detection current according to the current torque of the motor.
It is understood that any determined execution torque corresponds to a specific current value when the vehicle is running. For example, a preset relationship for executing a corresponding relationship between the torque and the current value may be established in advance, and after the current torque of the motor is obtained, according to the current torque of the motor, a corresponding open-phase detection current may be obtained through the preset relationship, where the open-phase detection current is a specific current value corresponding to the current torque. For another example, a plurality of torque intervals may be set, each torque interval corresponds to one open-phase detection current, after the current torque of the motor is obtained, a corresponding open-phase detection current may be determined according to the torque interval to which the current torque of the motor belongs, where the open-phase detection current is a specific current value corresponding to the current torque.
S203, if the phase currents of the three phases of the motor are all smaller than the corresponding open-phase detection currents, judging that the open-phase fault occurs to the motor.
It can be understood that, under the condition of normal operation of the motor, the arbitrarily determined execution torque corresponds to a specific current value, a current value I corresponding to each torque value can be set, and meanwhile, a phase-lack detection current I0 corresponding to each torque value is set according to the current value I corresponding to each torque value, when the current torque of the motor is greater than the phase-lack detection torque, under the normal condition, the three-phase current should be greater than the current value I corresponding to the current torque, and under the phase-lack condition, the three-phase current should be close to 0, so that through the comparison of the torque and the phase current of the motor, whether the motor has multi-phase and phase-lack during high-speed operation can be judged.
The open-phase detection current I0 may be a current value I or a current value smaller than the current value I.
Specifically, when a two-phase or multi-phase open-phase fault occurs, the effective value of the three-phase current should be close to 0. And when the current torque of the motor is greater than the default phase detection torque, if the effective values of the three-phase currents are all smaller than the default phase detection current corresponding to the current torque, the multi-phase default phase fault is determined.
Therefore, the phase loss is detected through the torque and the current of the motor, whether multiphase phase loss occurs when the motor runs at a high speed can be accurately detected, the motor is effectively protected, and the motor is prevented from being damaged. In addition, the method of the embodiment of the invention detects the open phase by a software mode without additionally adding an open phase protection circuit, thereby saving the detection cost.
In addition, according to another embodiment of the present invention, determining whether a phase-lack fault occurs in the motor according to the current torque of the motor and the three-phase currents of the motor may include:
and when the current torque of the motor is larger than the phase-lack detection torque and the three-phase current is smaller than the preset phase-lack detection current, judging that the motor has a phase-lack fault.
That is, under normal operating conditions of the motor, any determined actuation torque corresponds to a particular current value. The open-phase detection torque may be set to a current value I, and the open-phase detection current I0 may be set. When the torque of the motor is larger than the phase-lack detection torque, the current of the three phases at the moment is larger than I under the normal condition, and the current of the three phases is close to 0 under the phase-lack condition, so that when the torque of the motor is larger than the phase-lack detection torque and the phase current of the three phases of the motor is smaller than the phase-lack detection current, the multi-phase-lack fault is judged to occur, and the multi-phase-lack fault occurring under the operation state can be detected.
According to an embodiment of the present invention, as shown in fig. 3, when the motor is at a low speed, the method for detecting the phase loss of the motor includes the steps of:
s301, when the rotating speed of the motor is in a low rotating speed interval, three-phase voltage and three-phase current of the motor are obtained.
Specifically, when the rotating speed of the motor is less than or equal to the preset rotating speed, the rotating speed of the motor is determined to be in a low rotating speed interval.
And S303, judging whether the motor has a phase-lack fault according to the three-phase voltage and the three-phase current of the motor.
In one embodiment of the present invention, determining whether a phase-lack fault occurs in the motor according to three-phase voltages and three-phase currents of the motor comprises:
and if the phase voltage of any phase of the motor is greater than a preset voltage threshold and the phase current is less than a preset current threshold, judging that a phase-lacking fault occurs in any phase of the motor.
For example, taking U-phase as an example, if the U-phase voltage is greater than the preset voltage threshold and the U-phase current is less than the preset current threshold, the U-phase has a phase-missing fault.
Therefore, the specific phase loss can be accurately judged, a hardware protection circuit does not need to be additionally arranged, and the detection cost is greatly saved.
Further, in some embodiments of the present invention, after detecting that the phase-loss fault occurs in the motor, the motor controller performs a wave-off action, thereby preventing damage to the motor controller.
It can be understood that, in the embodiment of the present invention, the method for detecting a phase loss of a motor may specifically include: firstly, judging the interval of the rotating speed of the motor, if the rotating speed of the motor is in a low rotating speed interval, judging a phase-missing fault through the sampled three-phase voltage and three-phase current, namely if the phase voltage is greater than a preset voltage threshold and the phase current is less than a preset current threshold, judging that the phase is in a phase-missing state; and if the rotating speed of the motor is in a high rotating speed interval, detecting the phase lack of the motor through the execution torque of the motor and the sampled effective value of the three-phase current.
By adopting the phase-lack detection method of the motor, the problem of two-phase or three-phase-lack faults occurring at high speed of a vehicle can be solved, when the rotating speed of the motor is in a high-speed interval, a corresponding detection torque value and phase-lack detection current are set through a program, and the torque and the current of the motor are compared to judge the multi-phase-lack faults of the motor during high-speed operation, so that the phase-lack of the motor during operation can be accurately detected, and meanwhile, a hardware protection circuit is not required to be additionally arranged, and the detection cost is greatly saved. In addition, when the rotating speed of the motor is in a low-speed interval, whether the motor has a phase failure or not is judged through three-phase voltage and three-phase current of the motor, so that the specific phase failure can be accurately judged, a hardware protection circuit does not need to be additionally added, and the detection cost is greatly saved.
In order to realize the embodiment, the invention further provides a motor phase loss detection device.
Fig. 4 is a block diagram of a motor phase loss detection apparatus according to an embodiment of the present invention, and as shown in fig. 4, a motor phase loss detection apparatus 400 includes a first obtaining module 4011, a second obtaining module 4012, a second obtaining module 4013, and a control module 403.
The first obtaining module 4011 is configured to obtain a rotation speed of the motor; the second obtaining module 4012 is configured to obtain a current torque of the motor; the third obtaining module 4013 is configured to obtain a three-phase current of the motor; the control module 403 is configured to, when the rotation speed of the motor is in the high rotation speed interval and the current torque of the motor is greater than the phase-lack detection torque, obtain three-phase current of the motor, and determine whether a phase-lack fault occurs in the motor according to the current torque of the motor and the three-phase current of the motor.
According to an embodiment of the present invention, the control module 403 is further configured to determine a corresponding open-phase detection current according to the current torque of the motor, and determine that a open-phase fault occurs in the motor when the phase currents of the three phases of the motor are all smaller than the corresponding open-phase detection current.
According to an embodiment of the present invention, as shown in fig. 5, the open-phase detection apparatus 500 of the motor further includes: the fourth obtaining module 4014 obtains three-phase voltage of the motor; the control module 403 is configured to determine whether a phase-lack fault occurs in the motor according to three-phase voltages and three-phase currents of the motor when the rotation speed of the motor is in a low rotation speed interval.
According to an embodiment of the present invention, the control module 403 is further configured to determine that a phase-missing fault occurs in any phase of the motor when the phase voltage of any phase of the motor is greater than a preset voltage threshold and the phase current is less than a preset current threshold.
According to an embodiment of the present invention, the control module 403 is further configured to determine that the rotation speed of the motor is in a high rotation speed interval when the rotation speed of the motor is greater than a preset rotation speed, and determine that the rotation speed of the motor is in a low rotation speed interval when the rotation speed of the motor is less than or equal to the preset rotation speed.
It should be noted that the foregoing explanation of the embodiment of the method for detecting a phase loss of a motor is also applicable to the device for detecting a phase loss of a motor in this embodiment, and is not repeated herein.
Therefore, the phase-lack detection device of the motor can solve the problem of two-phase or three-phase-lack faults when a vehicle is at a high speed, and when the rotating speed of the motor is in a high-speed interval, corresponding detection torque values and phase-lack detection currents are set through a program, and the torque and the current of the motor are compared to judge the multi-phase-lack faults when the motor runs at the high speed, so that the phase-lack of the motor can be accurately detected, a hardware protection circuit is not required to be additionally arranged, and the detection cost is greatly saved. In addition, when the rotating speed of the motor is in a low-speed interval, whether the motor has a phase failure or not is judged through three-phase voltage and three-phase current of the motor, so that the specific phase failure can be accurately judged, a hardware protection circuit does not need to be additionally added, and the detection cost is greatly saved.
Based on the above embodiments, an embodiment of the present invention further provides a motor driving control system, including the phase-loss detection device of the motor in the above embodiments.
Based on the above embodiment, an embodiment of the present invention further provides a vehicle including the motor drive control system of the above embodiment.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (12)
1. A phase-loss detection method of a motor is characterized by comprising the following steps:
acquiring the rotating speed of the motor and acquiring the current torque of the motor;
when the rotating speed of the motor is in a high rotating speed interval and the current torque of the motor is larger than the phase-lack detection torque, the three-phase current of the motor is obtained, and whether the phase-lack fault occurs to the motor is judged according to the current torque of the motor and the three-phase current of the motor.
2. The method for detecting the open phase of the motor according to claim 1, wherein the determining whether the open phase fault occurs to the motor according to the current torque of the motor and the three-phase current of the motor comprises:
determining corresponding open-phase detection current according to the current torque of the motor;
and if the phase currents of the three phases of the motor are all smaller than the corresponding phase-lack detection currents, judging that the motor has a phase-lack fault.
3. The method for detecting a phase loss of an electric motor according to claim 1, further comprising:
when the rotating speed of the motor is in a low rotating speed interval, acquiring three-phase voltage and three-phase current of the motor;
and judging whether the motor has a phase-lack fault according to the three-phase voltage and the three-phase current of the motor.
4. The method for detecting the phase loss of the motor according to claim 3, wherein the determining whether the motor has the phase loss fault according to the three-phase voltages and the three-phase currents of the motor comprises:
and if the phase voltage of any phase of the motor is greater than a preset voltage threshold and the phase current is less than a preset current threshold, judging that a phase-lack fault occurs in any phase of the motor.
5. The method of detecting a phase loss of an electric motor according to claim 3,
when the rotating speed of the motor is greater than a preset rotating speed, determining that the rotating speed of the motor is in a high rotating speed interval;
and when the rotating speed of the motor is less than or equal to the preset rotating speed, determining that the rotating speed of the motor is in a low rotating speed interval.
6. A phase loss detection device for an electric motor, comprising:
the first acquisition module is used for acquiring the rotating speed of the motor;
the second acquisition module is used for acquiring the current torque of the motor;
the third acquisition module is used for acquiring three-phase current of the motor;
and the control module is used for acquiring the three-phase current of the motor when the rotating speed of the motor is in a high rotating speed interval and the current torque of the motor is greater than the phase-lack detection torque, and judging whether the phase-lack fault occurs to the motor according to the current torque of the motor and the three-phase current of the motor.
7. The device according to claim 6, wherein the control module is further configured to determine a corresponding open-phase detection current according to the current torque of the motor, and determine that the motor has an open-phase fault when the phase currents of the three phases of the motor are all smaller than the corresponding open-phase detection current.
8. The apparatus for detecting a phase loss of an electric motor according to claim 6, further comprising:
the fourth acquisition module acquires three-phase voltage of the motor;
the control module is used for judging whether the motor has a phase-lack fault according to three-phase voltage and three-phase current of the motor when the rotating speed of the motor is in a low rotating speed interval.
9. The device according to claim 8, wherein the control module is further configured to determine that a phase-missing fault occurs in any phase of the motor when the phase voltage of any phase of the motor is greater than a preset voltage threshold and the phase current is less than a preset current threshold.
10. The apparatus of claim 8, wherein the control module is further configured to determine that the rotation speed of the motor is in a high rotation speed interval when the rotation speed of the motor is greater than a preset rotation speed, and determine that the rotation speed of the motor is in a low rotation speed interval when the rotation speed of the motor is less than or equal to the preset rotation speed.
11. A motor drive control system characterized by comprising a phase loss detection device of a motor according to any one of claims 6 to 10.
12. A vehicle characterized by comprising the motor drive control system according to claim 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN113687151A (en) * | 2021-08-24 | 2021-11-23 | 合肥美的暖通设备有限公司 | Phase-loss detection method, device, drive circuit, motor, electrical equipment and medium |
| CN117595750A (en) * | 2024-01-19 | 2024-02-23 | 黑龙江惠达科技股份有限公司 | Electrical adjustment self-checking method and system for electric motor of spreader |
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| CN111366844B (en) | 2021-05-14 |
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