CN113708701B - Overmodulation method and system of motor controller - Google Patents
Overmodulation method and system of motor controller Download PDFInfo
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- CN113708701B CN113708701B CN202111019489.3A CN202111019489A CN113708701B CN 113708701 B CN113708701 B CN 113708701B CN 202111019489 A CN202111019489 A CN 202111019489A CN 113708701 B CN113708701 B CN 113708701B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010586 diagram Methods 0.000 claims abstract description 106
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 229910052742 iron Inorganic materials 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 230000003247 decreasing effect Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000013486 operation strategy Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/0004—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention provides an overmodulation method and system of a motor controller, wherein the overmodulation method comprises the following steps: acquiring a torque-rotating speed relation schematic diagram of a motor controller; based on a power assembly system formed by a motor controller and a motor, calibrating the power assembly system offline in an experimental environment within a full rotating speed range, a first efficiency map during normal operation and a second efficiency map during overmodulation operation; comparing the first efficiency map with the second efficiency map by taking the rotating speed of the motor as a transverse axis, and selecting an operation state with higher efficiency in the first efficiency map and the second efficiency map under each rotating speed; fitting a torque-rotation speed relation diagram of the powertrain system based on the selected running state; based on a torque-rotation speed relation schematic diagram of the power assembly system, the motor is subjected to overmodulation in a use environment. After the technical scheme is adopted, the efficiency of the power assembly system can be improved, and the endurance mileage of the electric automobile applying the motor controller is increased.
Description
Technical Field
The invention relates to the field of motor control, in particular to an overmodulation method and system of a motor controller.
Background
In a new energy vehicle-mounted driver or other frequency converters, an overmodulation scheme is often adopted to improve the voltage utilization rate of a direct current bus of a motor controller, the operation range is enlarged in a high-speed area, the current is smaller, and the efficiency of the motor controller is improved.
However, in the overmodulation region, since the output voltage of the inverter contains low order harmonics, this increases the core loss of the motor. Therefore, the overmodulation algorithm reduces copper loss of the motor and increases iron loss, the influence on the motor loss is determined according to actual conditions, and in an actual power assembly system, the comprehensive efficiency of the system is comprehensively influenced by the inverter and the motor, so that when a modulation operation strategy of the controller is selected, if only the motor controller is considered, the system efficiency is not necessarily increased.
Therefore, a novel overmodulation method of the motor controller is needed, so that the efficiency of a power assembly system can be improved, and the endurance mileage of an electric vehicle applying the motor controller is increased.
Disclosure of Invention
In order to overcome the technical defects, the invention aims to provide an overmodulation method and system of a motor controller, improve the efficiency of a power assembly system and increase the endurance mileage of an electric automobile applying the motor controller.
The invention discloses an overmodulation method of a motor controller, which comprises the following steps:
Acquiring a torque-rotating speed relation diagram of a motor controller, wherein the torque-rotating speed relation diagram is divided into a normal operation curve and an overmodulation operation curve;
based on a power assembly system formed by a motor controller and a motor, calibrating the power assembly system offline in an experimental environment within a full rotating speed range, a first efficiency map during normal operation and a second efficiency map during overmodulation operation;
comparing the first efficiency map with the second efficiency map by taking the rotating speed of the motor as a transverse axis, and selecting an operation state with higher efficiency in the first efficiency map and the second efficiency map under each rotating speed;
fitting a torque-rotation speed relation diagram of the powertrain system based on the selected running state;
based on a torque-rotation speed relation schematic diagram of the power assembly system, the motor is subjected to overmodulation in a use environment.
Preferably, the step of obtaining a torque-rotation speed relationship diagram of the motor controller, wherein the torque-rotation speed relationship diagram is divided into a normal operation curve and an overmodulation operation curve includes:
acquiring a first curve schematic diagram of a motor controller in normal operation within a full rotation speed range;
Acquiring a second curve diagram of the torque-rotating speed relation diagram in the overmodulation operation within the rotating speed range corresponding to the torque monotonically decreasing area;
and fitting a first curve diagram and a second curve diagram to obtain a torque-rotating speed relation diagram, wherein the first curve diagram is a normal operation curve, and the second curve diagram is an overmodulation operation curve.
Preferably, the step of calibrating the power assembly system offline in the experimental environment is based on a power assembly system formed by the motor controller and the motor, wherein the first efficiency map and the second efficiency map comprise copper loss data and iron loss data of the motor in the full rotation speed range during normal operation and during overmodulation operation.
Preferably, the step of comparing the first efficiency map and the second efficiency map with the rotation speed of the motor as the horizontal axis, and selecting an operation state with higher efficiency in the first efficiency map and the second efficiency map at each rotation speed includes:
comparing the first efficiency map with the second efficiency map by taking the rotating speed of the motor as a transverse axis;
And selecting an operation state with higher efficiency from the first efficiency map and the second efficiency map under each rotating speed, and recording torque data and rotating speed data under the selected operation state.
Preferably, the step of fitting a torque-speed relationship map of the powertrain system based on the selected operating conditions comprises:
based on the selected operation state, torque-rotation speed points comprising torque data and rotation speed data are sequentially connected to form a torque-rotation speed relation diagram of the power assembly system, wherein an overmodulation operation curve in the torque-rotation speed relation diagram of the power assembly system is lower than an overmodulation operation curve in the torque-rotation speed relation diagram of the motor controller, so that an overmodulation operation area is enlarged.
The invention also discloses an overmodulation system of the motor controller, which comprises the motor controller and the motor forming the power assembly system, and an upper computer connected with the power assembly system,
The upper computer generates a torque-rotating speed relation diagram of the motor controller, and the torque-rotating speed relation diagram is divided into a normal operation curve and an overmodulation operation curve;
the upper computer is used for calibrating the first efficiency map in normal operation and the second efficiency map in overmodulation operation of the power assembly system in an off-line mode in an experimental environment within a full rotating speed range;
The upper computer compares the first efficiency map with the second efficiency map by taking the rotating speed of the motor as a transverse axis, and selects an operation state with higher efficiency in the first efficiency map and the second efficiency map under each rotating speed;
based on the selected running state, the upper computer fits a torque-rotating speed relation diagram of the power assembly system;
Based on a torque-rotation speed relation schematic diagram of the power assembly system, the motor executes overmodulation under the use environment.
Preferably, the upper computer acquires a first curve schematic diagram of the motor controller in normal operation within a full rotation speed range;
The upper computer acquires a second curve diagram of the torque-rotating speed relation diagram when the over-modulation operation is performed in a rotating speed range corresponding to the torque monotonically decreasing area;
the upper computer fits a first curve diagram and a second curve diagram which are torque-rotating speed relation diagrams, wherein the first curve diagram is a normal operation curve, and the second curve diagram is an overmodulation operation curve.
Preferably, the first and second efficiency maps comprise copper loss data and iron loss data of the electric machine.
Preferably, the upper computer compares the first efficiency map with the second efficiency map by taking the rotating speed of the motor as a horizontal axis;
the upper computer selects an operation state with higher efficiency from the first efficiency map and the second efficiency map under each rotating speed, and records torque data and rotating speed data under the selected operation state.
Preferably, the upper computer sequentially connects torque-rotation speed points including torque data and rotation speed data based on the selected operation state to form a torque-rotation speed relation diagram of the powertrain system, wherein an overmodulation operation curve in the torque-rotation speed relation diagram of the powertrain system is lower than an overmodulation operation curve in the torque-rotation speed relation diagram of the motor controller, so as to enlarge an overmodulation operation area.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. The novel overmodulation strategy can be provided without increasing hardware cost;
2. By analyzing and calibrating the performance of the power train, the efficiency of the system can be improved, and the endurance mileage of the electric automobile is increased.
Drawings
FIG. 1 is a flow chart of an overmodulation method of a motor controller according to a preferred embodiment of the invention;
FIG. 2 is a graph showing torque versus rotational speed in accordance with a preferred embodiment of the present invention.
Detailed Description
Advantages of the invention are further illustrated in the following description, taken in conjunction with the accompanying drawings and detailed description.
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination" depending on the context.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.
In the following description, suffixes such as "module", "component", or "unit" for representing elements are used only for facilitating the description of the present invention, and are not of specific significance per se. Thus, "module" and "component" may be used in combination.
Referring to fig. 1, there is shown a flow chart of an overmodulation method of a motor controller in accordance with a preferred embodiment of the present invention, in which the overmodulation method includes the steps of:
s100: acquiring a torque-rotating speed relation diagram of a motor controller, wherein the torque-rotating speed relation diagram is divided into a normal operation curve and an overmodulation operation curve;
the motor controller has a torque relationship that can be generated at different rotational speeds, i.e., a torque-rotational speed relationship diagram. In this schematic diagram, it is divided into two parts, a normal operation curve and an overmodulation operation curve, respectively. Normally, the normal operation curve is in a straight line form, which means that at this rotational speed (e.g. at low speed), the same torque can be generated, and the torque will gradually decrease after entering the high speed region. The overmodulation has the effect of effectively improving the output fundamental wave voltage of the inverter, further improving the generated torque, and having great significance for shortening the dynamic response time of the motor and expanding steady-state operation.
S200: based on a power assembly system formed by a motor controller and a motor, calibrating the power assembly system offline in an experimental environment within a full rotating speed range, a first efficiency map during normal operation and a second efficiency map during overmodulation operation;
In the prior art, when overmodulation is used, a curve is defined entirely in terms of motor efficiency, and overmodulation is performed when the coordinates represented by the rotational speed and torque lie on the curve. But in practice this is not an improvement for the efficiency of the system. Therefore, in the step S200, the powertrain system composed of the motor controller and the motor is calibrated offline in the experimental environment, and the powertrain system is in the full rotation speed range, the first efficiency map during normal operation and the second efficiency map during overmodulation operation. Specifically, off-line calibration means that when the power assembly system is tested in an experimental environment and independently, a second efficiency map is drawn in a full-speed range from low speed to high speed under the motor speed, and in normal operation and overmodulation operation. That is, the first and second efficiency maps represent the efficiency of the powertrain system in two states, taking into account the effects of copper and iron losses in the electric machine on the powertrain system.
S300: comparing the first efficiency map with the second efficiency map by taking the rotating speed of the motor as a transverse axis, and selecting an operation state with higher efficiency in the first efficiency map and the second efficiency map under each rotating speed;
After the first efficiency map and the second efficiency map are provided, the rotation speed of the motor is used as a transverse axis to be compared, namely, under various rotation speeds, which operation state has higher efficiency is compared. The comparison mode can be used for comparing each point, and the first efficiency map and the second efficiency map can be drawn in the same coordinate axis so as to compare which map has higher efficiency curve under each rotating speed.
S400: fitting a torque-rotation speed relation diagram of the powertrain system based on the selected running state;
And finally fitting a torque-rotating speed relation diagram of the power assembly system for the selected running state. The torque-speed relationship diagram of the powertrain system shows the normal operating region and what conditions may be used to perform overmodulation at each speed. Referring to fig. 2, it is known that the overmodulation operating region will be enlarged, i.e. the portion originally belonging to the normal operating region will also perform overmodulation, because in these enlarged regions the efficiency of the motor controller may be reduced, but the efficiency of the drive train will be increased.
S500: based on torque-rotating speed relation schematic diagram of power assembly system, over-modulation is performed on motor in use environment
According to the establishment of the torque-rotation speed relation diagram, when the rotation speed and the torque in the overmodulation area are triggered in the use environment, overmodulation is executed.
In a preferred embodiment, the step S100 of obtaining a torque-rotation speed relationship diagram of the motor controller, where the torque-rotation speed relationship diagram is divided into a normal operation curve and an overmodulation operation curve includes:
s110: acquiring a first curve schematic diagram of a motor controller in normal operation within a full rotation speed range;
The first graph shows the rotational speed versus torque for normal operation of the motor when no overmodulation is performed.
S120: acquiring a second curve diagram of the torque-rotating speed relation diagram in the overmodulation operation within the rotating speed range corresponding to the torque monotonically decreasing area;
When the motor is operating normally, the torque will decrease monotonically in the high speed region, as described above, and therefore a new second graph representing the speed-torque relationship will be generated after performing overmodulation in these regions of monotonically decreasing torque.
S130: and fitting a first curve diagram and a second curve diagram to obtain a torque-rotating speed relation diagram, wherein the first curve diagram is a normal operation curve, and the second curve diagram is an overmodulation operation curve.
In yet another preferred embodiment, the step S200 of calibrating the powertrain system offline in the experimental environment within the full rotation speed range based on the powertrain system composed of the motor controller and the motor, the first efficiency map during normal operation and the second efficiency map during overmodulation operation include copper loss data and iron loss data of the motor, so that in the overmodulation region, the iron loss increased by the lower harmonics included in the output voltage of the inverter will be considered within the efficiency.
Preferably or optionally, the step S300 of comparing the first efficiency map and the second efficiency map with the rotation speed of the motor as the horizontal axis, and selecting an operation state having higher efficiency from the first efficiency map and the second efficiency map at each rotation speed includes:
s310: comparing the first efficiency map with the second efficiency map by taking the rotating speed of the motor as a transverse axis;
s320: and selecting an operation state with higher efficiency from the first efficiency map and the second efficiency map under each rotating speed, and recording torque data and rotating speed data under the selected operation state.
As described above, after comparing the first efficiency map and the second efficiency map, torque data and rotation speed data in an operating state having higher efficiency will be recorded in the form of coordinates.
Further, based on the selected operation state, the step S400 of fitting the torque-rotation speed relationship diagram of the powertrain system includes:
S410: based on the selected operation state, torque-rotation speed points comprising torque data and rotation speed data are sequentially connected to form a torque-rotation speed relation diagram of the power assembly system, wherein an overmodulation operation curve in the torque-rotation speed relation diagram of the power assembly system is lower than an overmodulation operation curve in the torque-rotation speed relation diagram of the motor controller, so that an overmodulation operation area is enlarged.
That is, the torque-rotation speed relationship formed by connecting the points in the form of coordinates will be the relationship in the power train. From this new torque-speed relationship diagram, it is known that the overmodulation operating region within the overmodulation operating curve will increase.
The invention also discloses an overmodulation system of the motor controller, which comprises the motor controller and a motor forming a power assembly system, and an upper computer connected with the power assembly system, wherein the upper computer generates a torque-rotating speed relation diagram of the motor controller, and the torque-rotating speed relation diagram is divided into a normal operation curve and an overmodulation operation curve; the upper computer is used for calibrating the first efficiency map in normal operation and the second efficiency map in overmodulation operation of the power assembly system in an off-line mode in an experimental environment within a full rotating speed range; the upper computer compares the first efficiency map with the second efficiency map by taking the rotating speed of the motor as a transverse axis, and selects an operation state with higher efficiency in the first efficiency map and the second efficiency map under each rotating speed; based on the selected running state, the upper computer fits a torque-rotating speed relation diagram of the power assembly system; based on a torque-rotation speed relation schematic diagram of the power assembly system, the motor executes overmodulation under the use environment. In the above embodiment, the upper computer may be various control modules connected to the motor controller, and the like.
Preferably, the upper computer acquires a first curve schematic diagram of the motor controller in normal operation within a full rotation speed range; the upper computer acquires a second curve diagram of the torque-rotating speed relation diagram when the over-modulation operation is performed in a rotating speed range corresponding to the torque monotonically decreasing area;
the upper computer fits a first curve diagram and a second curve diagram which are torque-rotating speed relation diagrams, wherein the first curve diagram is a normal operation curve, and the second curve diagram is an overmodulation operation curve.
Preferably or alternatively, the first and second efficiency maps comprise copper loss data and iron loss data of the electric machine.
Preferably or optionally, the upper computer compares the first efficiency map and the second efficiency map with the rotation speed of the motor as a horizontal axis; the upper computer selects an operation state with higher efficiency from the first efficiency map and the second efficiency map under each rotating speed, and records torque data and rotating speed data under the selected operation state.
Preferably or optionally, the upper computer sequentially connects torque-rotation speed points including the torque data and the rotation speed data based on the selected operation state to form a torque-rotation speed relation diagram of the powertrain system, wherein an overmodulation operation curve in the torque-rotation speed relation diagram of the powertrain system is lower than an overmodulation operation curve in the torque-rotation speed relation diagram of the motor controller, so as to enlarge the overmodulation operation area.
It should be noted that the embodiments of the present invention are preferred and not limited in any way, and any person skilled in the art may make use of the above-disclosed technical content to change or modify the same into equivalent effective embodiments without departing from the technical scope of the present invention, and any modification or equivalent change and modification of the above-described embodiments according to the technical substance of the present invention still falls within the scope of the technical scope of the present invention.
Claims (10)
1. An overmodulation method of a motor controller, comprising the steps of:
acquiring a torque-rotating speed relation diagram of a motor controller, wherein the torque-rotating speed relation diagram is divided into a normal operation curve and an overmodulation operation curve;
based on a power assembly system formed by a motor controller and a motor, calibrating the power assembly system offline in an experimental environment in a full rotating speed range, and a first efficiency map during normal operation and a second efficiency map during overmodulation operation;
Comparing the first efficiency map with the second efficiency map by taking the rotating speed of the motor as a transverse axis, and selecting an operation state with higher efficiency in the first efficiency map and the second efficiency map under each rotating speed;
fitting a torque-rotation speed relation diagram of the powertrain system based on the selected running state;
Based on the torque-rotation speed relation schematic diagram of the power assembly system, the motor is subjected to overmodulation in a use environment.
2. The overmodulation method of claim 1, wherein the step of obtaining a torque-to-speed relationship diagram of the motor controller, the torque-to-speed relationship diagram divided into a normal operating curve and an overmodulation operating curve comprises:
acquiring a first curve schematic diagram of a motor controller in normal operation within a full rotation speed range;
Acquiring a second curve diagram of the torque-rotating speed relation diagram in the overmodulation operation within the rotating speed range corresponding to the torque monotonically decreasing area;
fitting a first curve diagram and a second curve diagram to obtain a torque-rotating speed relation diagram, wherein the first curve diagram is a normal operation curve, and the second curve diagram is an overmodulation operation curve.
3. The overmodulation method of claim 1, wherein the step of calibrating the powertrain system offline in an experimental environment over a full speed range based on a powertrain system comprised of a motor controller and a motor, the first and second efficiency maps comprising copper loss data and iron loss data of the motor during normal operation and during overmodulation operation.
4. The overmodulation method of claim 1, wherein comparing the first and second efficiency maps with a rotation speed of the motor as a horizontal axis, and selecting an operating state having higher efficiency from the first and second efficiency maps at each rotation speed comprises:
Comparing the first efficiency map with the second efficiency map by taking the rotating speed of the motor as a horizontal axis;
And selecting an operation state with higher efficiency from the first efficiency map and the second efficiency map under each rotating speed, and recording torque data and rotating speed data under the selected operation state.
5. The overmodulation method of claim 4, wherein the step of fitting a torque-to-rotational speed relationship map of the powertrain system based on the selected operating condition comprises:
based on the selected operation state, torque-rotation speed points comprising torque data and rotation speed data are sequentially connected to form a torque-rotation speed relation diagram of the power assembly system, wherein an overmodulation operation curve in the torque-rotation speed relation diagram of the power assembly system is lower than an overmodulation operation curve in the torque-rotation speed relation diagram of the motor controller, so that an overmodulation operation area is enlarged.
6. An overmodulation system of a motor controller comprises a motor controller and a motor forming a power assembly system, and an upper computer connected with the power assembly system, and is characterized in that,
The upper computer generates a torque-rotating speed relation diagram of the motor controller, and the torque-rotating speed relation diagram is divided into a normal operation curve and an overmodulation operation curve;
the upper computer is used for calibrating the first efficiency map in normal operation and the second efficiency map in overmodulation operation of the power assembly system in an off-line mode in an experimental environment within a full rotating speed range;
the upper computer compares the first efficiency map with the second efficiency map by taking the rotating speed of the motor as a horizontal axis, and selects an operation state with higher efficiency in the first efficiency map and the second efficiency map under each rotating speed;
based on the selected running state, the upper computer fits a torque-rotating speed relation diagram of the power assembly system;
Based on the torque-rotation speed relation schematic diagram of the power assembly system, the motor executes overmodulation under the use environment.
7. The overmodulation system of claim 6,
The upper computer obtains a first curve schematic diagram of the motor controller in normal operation within a full rotation speed range;
The upper computer acquires a second curve diagram of the torque-rotating speed relation diagram in the overmodulation operation within the rotating speed range corresponding to the torque monotonically decreasing area;
The upper computer fits a first curve diagram and a second curve diagram which are torque-rotating speed relation diagrams, wherein the first curve diagram is a normal running curve, and the second curve diagram is an overmodulation running curve.
8. The overmodulation system of claim 6,
The first and second efficiency maps include copper loss data and iron loss data for the motor.
9. The overmodulation system of claim 6,
The upper computer compares the first efficiency map with the second efficiency map by taking the rotating speed of the motor as a horizontal axis;
the upper computer selects an operation state with higher efficiency from the first efficiency map and the second efficiency map under each rotating speed, and records torque data and rotating speed data under the selected operation state.
10. The overmodulation system of claim 9,
The upper computer is sequentially connected with torque-rotating speed points comprising torque data and rotating speed data based on the selected operating state to form a torque-rotating speed relation diagram of the power assembly system, wherein an overmodulation operating curve in the torque-rotating speed relation diagram of the power assembly system is lower than an overmodulation operating curve in the torque-rotating speed relation diagram of the motor controller so as to enlarge an overmodulation operating area.
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