CN114567225A - Charging control method, device and circuit of three-phase motor and electric vehicle - Google Patents

Charging control method, device and circuit of three-phase motor and electric vehicle Download PDF

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Publication number
CN114567225A
CN114567225A CN202210266142.7A CN202210266142A CN114567225A CN 114567225 A CN114567225 A CN 114567225A CN 202210266142 A CN202210266142 A CN 202210266142A CN 114567225 A CN114567225 A CN 114567225A
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China
Prior art keywords
rotor
phase motor
bridge arm
duty ratio
stator winding
Prior art date
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Pending
Application number
CN202210266142.7A
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Chinese (zh)
Inventor
黄华波
初康康
阮鸥
徐循进
李西光
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Geely Holding Group Co Ltd
Weirui Electric Automobile Technology Ningbo Co Ltd
Zeekr Automobile Ningbo Hangzhou Bay New Area Co Ltd
Original Assignee
Zhejiang Geely Holding Group Co Ltd
Weirui Electric Automobile Technology Ningbo Co Ltd
Zeekr Automobile Ningbo Hangzhou Bay New Area Co Ltd
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Application filed by Zhejiang Geely Holding Group Co Ltd, Weirui Electric Automobile Technology Ningbo Co Ltd, Zeekr Automobile Ningbo Hangzhou Bay New Area Co Ltd filed Critical Zhejiang Geely Holding Group Co Ltd
Priority to CN202210266142.7A priority Critical patent/CN114567225A/en
Publication of CN114567225A publication Critical patent/CN114567225A/en
Pending legal-status Critical Current

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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
    • H02P21/22—Current control, e.g. using a current control loop
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B60L53/24—Using the vehicle's propulsion converter for charging
    • 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
    • H02P21/05—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for damping motor oscillations, e.g. for reducing hunting
    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

According to the charging control method, the charging control device, the charging control circuit and the electric vehicle of the three-phase motor, firstly, the current position of a rotor in the three-phase motor is obtained; then, determining the duty ratio of a bridge arm corresponding to the current position of the rotor according to the mapping relation between the position of the rotor and the duty ratio of the bridge arm in a converter corresponding to the three-phase motor; and finally, adjusting the included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor according to the duty ratio of the bridge arm corresponding to the current position of the rotor. Through the mode, because the included angle between the total current vector of the motor stator winding and the position of the permanent magnet flux linkage of the motor rotor can be adjusted according to the current position of the motor rotor, the electromagnetic torque of the motor rotor under the charging mode is reduced, the stability of the charging process is improved, and the loss and the potential safety hazard are reduced.

Description

Charging control method, device and circuit of three-phase motor and electric vehicle
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a charging control method, a charging control device and a charging control circuit for a three-phase motor and an electric vehicle.
Background
Conventional electric vehicles typically include power batteries, motor drive systems, on-board charging systems, battery management systems, and the like. The power battery is a main energy storage device of the electric automobile, and electric energy in the power battery can be converted into traction force through the motor driving system in the running process of the automobile. However, the power battery has a limited duration, and needs to be charged by an onboard charging system.
Owing to receive the restriction of factors such as space, weight, among the prior art, the motor drive of integrated form receives the industry to pay attention to extensively with on-vehicle charging system, and the realization thinking of this type of system is: a motor stator winding and an inverter in a motor driving system are respectively multiplexed into a charging filter inductor and a rectifier in a vehicle-mounted charging system, so that a driving and charging integrated circuit is constructed, and the size and the weight of the vehicle-mounted charging system are greatly reduced.
However, when multiplexed as a charge filter inductance, the current passing through the stator windings of the motor necessarily creates a magnetic field in the motor air gap where the motor rotor is subjected to a continuous tangential torque, causing the motor to vibrate or rotate. The existing driving and charging integrated circuit cannot effectively control the electromagnetic torque of a motor rotor in a charging mode, so that the stopping state of a vehicle is possibly influenced, the stability of the charging process is further reduced, and loss and potential safety hazards are increased.
Disclosure of Invention
The application provides a charging control method, a charging control device, a charging control circuit and an electric vehicle of a three-phase motor, and aims to solve the technical problem that electromagnetic torque applied to a motor rotor in a charging mode cannot be effectively controlled in the prior art.
In a first aspect, the present application provides a charge control method for a three-phase motor, the method including:
acquiring the current position of a rotor in the three-phase motor;
determining the duty ratio of a bridge arm corresponding to the current position of the rotor according to the mapping relation between the position of the rotor and the duty ratio of the bridge arm in a converter corresponding to the three-phase motor;
and adjusting an included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor according to the duty ratio of the bridge arm corresponding to the current position of the rotor.
In an optional embodiment, the determining the duty ratio of the bridge arm corresponding to the current position of the rotor includes:
and determining a duty ratio of a first bridge arm and a duty ratio of a second bridge arm corresponding to the current position of the rotor, wherein the first bridge arm is a bridge arm corresponding to a first stator winding in the three-phase motor, the second bridge arm is a bridge arm corresponding to a second stator winding in the three-phase motor, the first stator winding is used for outputting a first current vector, and the second stator winding is used for outputting a second current vector.
In an alternative embodiment, the sum of the duty cycle of the first leg and the duty cycle of the second leg is 1.
In an optional embodiment, the adjusting an angle between a total current vector of a stator winding in the three-phase motor and a position of a permanent magnet flux linkage of the rotor includes:
and adjusting the included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor within a preset included angle adjusting range.
In an alternative embodiment, the converter comprises a dc-dc converter and/or an ac-dc converter.
In a second aspect, the present application provides a charge control device for a three-phase motor, the device comprising:
the acquisition module is used for acquiring the current position of a rotor in the three-phase motor;
the control module is used for determining the duty ratio of the bridge arm corresponding to the current position of the rotor according to the mapping relation between the position of the rotor and the duty ratio of the bridge arm in the converter corresponding to the three-phase motor; and adjusting an included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor according to the duty ratio of the bridge arm corresponding to the current position of the rotor.
In an optional embodiment, the control module is specifically configured to determine a duty ratio of a first bridge arm and a duty ratio of a second bridge arm corresponding to the current position of the rotor, where the first bridge arm is a bridge arm corresponding to a first stator winding in the three-phase motor, the second bridge arm is a bridge arm corresponding to a second stator winding in the three-phase motor, the first stator winding is configured to output a first current vector, and the second stator winding is configured to output a second current vector.
In an alternative embodiment, the sum of the duty cycle of the first leg and the duty cycle of the second leg is 1.
In an optional implementation manner, the control module is specifically configured to adjust an included angle between a total current vector of a stator winding in the three-phase motor and a position of a permanent magnet flux linkage of the rotor within a preset included angle adjustment range.
In an alternative embodiment, the converter comprises a dc-dc converter and/or an ac-dc converter.
In a third aspect, the present application provides a charge control circuit for a three-phase motor, comprising: a controller, a three-phase motor and an inverter; the controller is respectively connected with the three-phase motor and the converter, and the three-phase motor is connected with the converter; wherein the controller is configured to: acquiring the current position of a rotor in the three-phase motor; determining the duty ratio of a bridge arm corresponding to the current position of the rotor according to the mapping relation between the position of the rotor and the duty ratio of the bridge arm in a converter corresponding to the three-phase motor; and adjusting an included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor according to the duty ratio of the bridge arm corresponding to the current position of the rotor.
In a fourth aspect, the present application provides an electric vehicle comprising: a battery and a charge control circuit; the charge control circuit is connected to the battery, and a controller in the charge control circuit is configured to perform the method according to any one of the first aspect.
According to the charging control method, the charging control device, the charging control circuit and the electric vehicle of the three-phase motor, firstly, the current position of a rotor in the three-phase motor is obtained; then, determining the duty ratio of a bridge arm corresponding to the current position of the rotor according to the mapping relation between the position of the rotor and the duty ratio of the bridge arm in a converter corresponding to the three-phase motor; and finally, adjusting the included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor according to the duty ratio of the bridge arm corresponding to the current position of the rotor. Through the mode, because the included angle between the total current vector of the motor stator winding and the position of the permanent magnet flux linkage of the motor rotor can be adjusted according to the current position of the motor rotor, the electromagnetic torque of the motor rotor under the charging mode is reduced, the stability of the charging process is improved, and the loss and the potential safety hazard are reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings needed to be used in the description of the embodiments or the prior art, and obviously, the drawings in the following description are some embodiments of the present invention, and those skilled in the art can obtain other drawings according to the drawings without inventive labor.
Fig. 1 is a schematic circuit structure diagram of a charging control circuit of a three-phase motor according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a charging control method for a three-phase motor according to an embodiment of the present disclosure;
fig. 3 is a schematic view of current vectors of stator windings in a three-phase motor according to this embodiment;
FIG. 4 shows an electromagnetic torque T provided by an embodiment of the present applicationeA corresponding relation graph between the angle beta and the angle beta;
fig. 5 is a diagram illustrating a correspondence relationship between a duty ratio k and an included angle θ according to an embodiment of the present disclosure;
FIG. 6 shows an electromagnetic torque T provided by an embodiment of the present applicationeComparing schematic diagrams before and after adjustment;
fig. 7 is a schematic flowchart of another charging control method for a three-phase motor according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a charging control device for a three-phase motor according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Conventional electric vehicles typically include power batteries, motor drive systems, on-board charging systems, battery management systems, and the like. The power battery is a main energy storage device of the electric automobile, and electric energy in the power battery can be converted into traction force through the motor driving system in the running process of the automobile. However, the power battery has a limited duration, and needs to be charged by an onboard charging system.
Owing to receive the restriction of factors such as space, weight, among the prior art, the motor drive of integrated form receives the industry wide attention with on-vehicle charging system, and the realization thinking of this type of system is: a motor stator winding and an inverter in a motor driving system are respectively multiplexed into a charging filter inductor and a rectifier in a vehicle-mounted charging system, so that a driving and charging integrated circuit is constructed, and the size and the weight of the vehicle-mounted charging system are greatly reduced.
However, when multiplexed as a charge filter inductance, the current passing through the stator windings of the motor necessarily creates a magnetic field in the motor air gap where the motor rotor is subjected to a continuous tangential torque, causing the motor to vibrate or rotate. The existing driving and charging integrated circuit cannot effectively control the electromagnetic torque of a motor rotor in a charging mode, so that the stopping state of a vehicle is possibly influenced, the stability of the charging process is further reduced, and loss and potential safety hazards are increased.
In order to solve the technical problem, embodiments of the present application provide a charging control method, apparatus, circuit and electric vehicle for a three-phase motor, in which an included angle between a total current vector of a motor stator winding and a position of a permanent magnet flux linkage of a motor rotor is adjusted according to a current position of the motor rotor, so that an electromagnetic torque applied to the motor rotor in a charging mode is reduced, and thus stability of a charging process is improved and loss and potential safety hazards are reduced.
The following describes a circuit configuration of a charge control circuit for a three-phase motor according to the present invention.
Fig. 1 is a schematic circuit structure diagram of a charging control circuit of a three-phase motor according to an embodiment of the present disclosure. As shown in fig. 1, the controller 101 and the integrated drive and charge circuit 102 are included. The integrated driving and charging circuit 102 includes a first interface 1021, a capacitor 1022, a relay switch 1023, a three-phase motor 1024, a direct current-direct current (DC/DC) converter 1025, a capacitor 1026, a second interface 1027, and a relay switch 1028.
The connection relationship between the parts is shown in fig. 1. In addition, the first interface 1021 may be connected to an external charging power source, and the second interface 1027 may be connected to a battery pack of an automobile. The charging current in the charging mode can flow into a single phase in the three-phase motor and flow out of the other two phases in parallel.
It is understood that the controller 101 may be used to control the driving and/or charging process of the integrated driving and charging circuit 102. It should be noted that the charging control circuit may be applicable to a dc charging mode of the electric vehicle, that is, the first interface 1021 may be connected to the dc charging pile. In other embodiments, after the circuit structure is adjusted, for example, an alternating current-direct current (AC/DC) converter is added, the charging control circuit may also be applied to an alternating current charging mode of an electric vehicle, which is not limited in this embodiment of the present application.
It should be understood that the circuit structure of the charging control circuit according to the present disclosure may be the circuit structure of the charging control circuit of the three-phase motor in fig. 1, but is not limited thereto, and may also be other circuit structures that require charging control of the three-phase motor.
The following takes a controller integrated or installed with relevant execution codes as an example, and details the technical solution of the embodiment of the present application with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 2 is a schematic flowchart of a charging control method for a three-phase motor according to an embodiment of the present disclosure, where the embodiment relates to a process of performing charging control on the three-phase motor. As shown in fig. 2, the method includes:
s201, acquiring the current position of a rotor in the three-phase motor.
In this embodiment of the present application, the controller may first obtain a current position of the rotor of the three-phase motor, and then adjust an included angle between a total current vector of the stator winding and a position of a permanent magnet flux linkage of the rotor according to the current position of the rotor.
The embodiment of the application does not limit how to obtain the current position of the rotor. In some embodiments, the controller may acquire the rotor position via corresponding position sensors of the three-phase motor. Illustratively, the current position of the rotor is acquired in real time by a rotary encoder at the shaft end of the three-phase motor. The embodiment of the present application is not limited to the type of the three-phase motor.
The total current vector of the stator windings in a three-phase machine is explained below. For example, fig. 3 is a schematic diagram of current vectors of stator windings in a three-phase motor according to the present embodiment. As shown in fig. 3, the three-phase motor includes a phase a stator winding, a phase B stator winding, and a phase C stator winding, and current vectors corresponding to the phase a stator winding, the phase B stator winding, and the phase C stator winding are ia、ib、ic. Wherein ia、ib、icAre respectively shown as arrows in fig. 3, i can be expresseda、ib、icIs defined as the total current vector i of the stator windingsAnd will ia、ib、ic、isThe magnitude of the current vector is respectively marked as Ia、Ib、Ic、Is. In the integrated circuit of driving and charging, the current can flow in from the A-phase stator winding and flow out from the B-phase and C-phase stator windings in parallel in the charging mode, namely Ib＝Ic＝-0.5Ia。
The following describes the angle β between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor. For example, if the direction of the permanent magnet flux linkage in the rotor is taken as the d axis, a common d-q coordinate system can be established on the rotor of the three-phase motor, and the coordinate system rotates synchronously with the rotor. At this time, the total current vector isThe included angle beta between the position of the permanent magnet flux linkage of the rotor and the position of the permanent magnet flux linkage of the rotor is the total current vector isThe included angle between the d axis and the axis. It will be appreciated that due to IaIs substantially stationary during a certain charging process, and Ib＝Ic＝-0.5IaThus the total current vector isAre all fixed in the direction of the d axis, and the d axis is generated along with the position of the rotorThe angle beta can thus be determined by the position of the rotor.
Next, the electromagnetic torque applied to the rotor in the three-phase motor will be described. Illustratively, equation (1) is an electromagnetic torque equation for a three-phase motor.
Figure BDA0003552617040000071
Wherein, TeIs the electromagnetic torque of the rotor, p is the pole pair number of the three-phase motor,
Figure BDA0003552617040000072
is the size of the permanent magnet flux linkage in the rotor, Ld、LqInductance components of d-and q-axes of the motor, IsThe size of the total current vector in the stator winding is shown, and beta is the included angle between the total current vector and the direction of the permanent magnet flux linkage in the rotor. As can be seen from the formula (1), the charging current IaUnder the condition of fixed size, electromagnetic torque T corresponding to a certain three-phase motoreIs determined by the angle beta.
Due to the total current vector isThe size is fixed, and the direction is superposed with the straight line of the A phase of the stator winding. If the position where the A phase of the stator winding is overlapped with the d axis of the rotor is taken as the initial position, and the anticlockwise direction is taken as the positive direction of the change of the included angle beta when the d axis rotates, the value range of the included angle beta at the moment can be recorded as [0 degrees ], 360 degrees. For example, fig. 4 illustrates an electromagnetic torque T provided by an embodiment of the present applicationeAnd the corresponding relation between the angle beta. If fig. 4 shows, the horizontal axis of the coordinate system is the value of the included angle β, and the vertical axis is the electromagnetic torque TeThe value of (a). As can be seen from fig. 4, during the stationary charging of the vehicle, the electromagnetic torque T is different due to the position of the rotoreMay be extremely large and thus may result in unintended movement of the electric vehicle.
S202, determining the duty ratio of the bridge arm corresponding to the current position of the rotor according to the mapping relation between the position of the rotor and the duty ratio of the bridge arm in the converter corresponding to the three-phase motor.
In this step, after the current position of the rotor is obtained, the controller may determine the duty ratio of the bridge arm corresponding to the current position of the rotor according to a mapping relationship between the position of the rotor and the duty ratios of the bridge arms in the converter corresponding to the three-phase motor.
The embodiment of the application does not limit how to determine the duty ratio of the bridge arm corresponding to the current position of the rotor. In some embodiments, the controller may determine the duty ratio of the first leg and the duty ratio of the second leg corresponding to the current position of the rotor according to the mapping relationship. The first bridge arm is a bridge arm corresponding to a first stator winding in the three-phase motor, the second bridge arm is a bridge arm corresponding to a second stator winding in the three-phase motor, the first stator winding is used for outputting a first current vector, and the second stator winding is used for outputting a second current vector. For example, the charging current may flow into the a-phase stator winding of the three-phase motor, and flow out of the B-phase stator winding and the C-phase stator winding in parallel, where the B-phase stator winding and the C-phase stator winding are respectively connected to the first arm and the second arm of the DC/DC converter.
The embodiment of the application does not limit the relationship between the duty ratios of the first bridge arm and the second bridge arm. In some embodiments, the sum of the duty cycle of the first leg and the duty cycle of the second leg is 1. Illustratively, if the duty ratio of the bridge arm corresponding to the B-phase stator winding is denoted as k, the duty ratio of the bridge arm corresponding to the C-phase stator winding is defined as 1-k, and the value range of k is [0,1], proportional distribution of the charging current between the B-phase and the C-phase can be realized.
Furthermore, I can be changed by adjusting the duty ratio of the bridge arms corresponding to the stator windings of the B phase and the C phaseb、IcTo adjust the total current vector isAnd the included angle theta with the position of the phase A. The correspondence between the duty ratio k and the angle θ will be described below. Exemplarily, fig. 5 is a corresponding relationship diagram between a duty ratio k and an included angle θ provided in the embodiment of the present application. As shown in fig. 5, when k is 1, Ib＝-Ia，IcWhen the angle is equal to 0, the included angle theta is 30 degrees; when k is 0.5, Ib＝Ic＝-0.5IaIf the included angle theta is 0 degree; when k is 1, Ib＝0，Ic＝-IaThe included angle θ is also 30 °. Therefore, if the position of the phase a is taken as the initial position of the included angle θ and the counterclockwise direction is taken as the positive direction of the included angle, the corresponding range of values when the included angle θ changes with the change of the duty ratio k can be taken as [ -30 °,30 ° ]]。
In the embodiment of the present application, how to determine the mapping relationship between the position of the rotor and the duty ratio of the bridge arm in the converter corresponding to the three-phase motor is not limited. In some embodiments, the mapping relationship can be determined according to an electromagnetic torque formula of a three-phase motor, so that the purpose of adjusting the included angle β by adjusting k and further reducing the electromagnetic torque applied to the rotor in the charging process is achieved. For example, according to the current position of the rotor fed back when the automobile stops, the current position of the d-axis can be determined; if the included angle between the current position of the d axis and the position of the phase A is recorded as an included angle alpha, the adjustment range of the included angle beta along with the duty ratio k can be [ alpha-30 degrees ], alpha +30 degrees ] as the adjustment range of the included angle theta can be [ -30 degrees ] and 30 degrees ]; according to the electromagnetic torque formula, the included angle beta and the included angle theta corresponding to the minimum electromagnetic torque can be determined in the adjustment range of the included angle beta, and then the duty ratio k corresponding to the minimum electromagnetic torque can be determined according to the relation between the included angle theta and the duty ratio k, so that the mapping relation between the current position of the rotor and the duty ratio k is established.
Illustratively, table 1 is a table of a mapping relationship between the included angle α and the duty ratio k provided in the embodiments of the present application. In the original scheme, since the value of k is fixed to 0.5, the included angle α and the included angle β have the same size. In the embodiment of the present application, since the value of k can be adjusted, the included angle β — included angle θ can be obtained. As shown by the data in Table 1, the values of k regulate the electromagnetic torque T experienced by the rotor before it is subjected toeCompared with the electromagnetic torque T borne by the rotor after the value of k is adjustedeIs significantly reduced.
TABLE 1
α/° k θ/° Te/Niu Mi (after adjustment) Te/Niu Mi (before adjustment)
10 0.35 9.8 0.1 5.242474009
20 0.20 19.1 0.4 10.95945554
30 0.00 30.0 0.0 17.53458912
40 0.00 30.0 4.8 25.18177455
160 0.80 -19.1 1.9 37.3618953
170 0.65 -9.8 0.3 19.29091877
180 0.50 0.0 0.0 1.37E-14
Illustratively, fig. 6 is an electromagnetic torque T provided by an embodiment of the present applicationeSchematic comparison before and after adjustment. As shown in FIG. 6, the horizontal axis represents the value of the included angle α, and the curve A represents the electromagnetic torque T before k is adjustedeA curve varying with the angle α; curve B is the electromagnetic torque T after k adjustmenteThe variation curve with the included angle alpha. It can be seen from fig. 6 that the electromagnetic torque T applied to the rotor after k adjustment is directly and clearly showneIs obviously reduced.
And S203, adjusting an included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor according to the duty ratio of the bridge arm corresponding to the current position of the rotor.
In this step, after the duty ratio of the bridge arm corresponding to the current position of the rotor is determined, the controller may adjust an included angle between a total current vector of the stator winding in the three-phase motor and a position of a permanent magnet flux linkage of the rotor according to the duty ratio of the bridge arm corresponding to the current position of the rotor.
The embodiment of the present application does not limit how to adjust the included angle β. In some embodiments, the controller may adjust an angle between a total current vector of the stator winding and a position of a permanent magnet flux linkage of the rotor in the three-phase motor within a preset angle adjustment range.
It should be noted that when charging current flows from a tap at a central point of three phases of the three-phase motor and is output in parallel from A, B, C three phases, the electromagnetic torque applied to the rotor of the three-phase motor is small. However, the current ripple frequency in the scheme is high, so that the motor generates heat seriously; secondly, the charging inductance is small, and additional hardware is needed to increase the inductance value. According to the charging control method of the three-phase motor, when charging current flows in from a single phase of the three-phase motor and is output in parallel from other two phases, the Boost inductance value is improved due to the series connection of the phase inductances of the motor, so that the current ripple in the charging process is reduced, and the use of the external charging inductance is reduced.
The application provides a charging control method of a three-phase motor, which comprises the steps of firstly, obtaining the current position of a rotor in the three-phase motor; then, determining the duty ratio of a bridge arm corresponding to the current position of the rotor according to the mapping relation between the position of the rotor and the duty ratio of the bridge arm in a converter corresponding to the three-phase motor; and finally, adjusting the included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor according to the duty ratio of the bridge arm corresponding to the current position of the rotor. Through the mode, because the included angle between the total current vector of the motor stator winding and the position of the permanent magnet flux linkage of the motor rotor can be adjusted according to the current position of the motor rotor, the electromagnetic torque of the motor rotor under the charging mode is reduced, the stability of the charging process is improved, and the loss and the potential safety hazard are reduced.
On the basis of the above embodiment, how the controller determines the duty ratio of the arm corresponding to the current position of the rotor is described below. Fig. 7 is a schematic flowchart of another charging control method for a three-phase motor according to an embodiment of the present application, and as shown in fig. 7, the method includes:
and S701, acquiring the current position of a rotor in the three-phase motor.
S701, determining the duty ratio of the first bridge arm corresponding to the current position of the rotor according to the mapping relation between the position of the rotor and the duty ratio of the first bridge arm.
And S703, determining the duty ratio of the second bridge arm corresponding to the current position of the rotor according to the relationship between the duty ratios of the first bridge arm and the second bridge arm.
And S704, adjusting an included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor according to the duty ratio of the first bridge arm and the duty ratio of the second bridge arm corresponding to the determined current position of the rotor.
Technical terms, technical effects, technical features, and alternative embodiments of S701 to S704 can be understood with reference to S201 to S203 shown in fig. 2, and repeated descriptions thereof will not be repeated here.
The application provides a charging control method of a three-phase motor, which comprises the steps of firstly, obtaining the current position of a rotor in the three-phase motor; then, determining the duty ratio of a bridge arm corresponding to the current position of the rotor according to the mapping relation between the position of the rotor and the duty ratio of the bridge arm in a converter corresponding to the three-phase motor; and finally, adjusting the included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor according to the duty ratio of the bridge arm corresponding to the current position of the rotor. Through the mode, because the included angle between the total current vector of the motor stator winding and the position of the permanent magnet flux linkage of the motor rotor can be adjusted according to the current position of the motor rotor, the electromagnetic torque of the motor rotor in a charging mode in the electric automobile driving and charging integrated circuit is reduced, the stability of the charging process is improved, and the loss and the potential safety hazard are reduced.
Fig. 8 is a schematic structural diagram of a charging control device for a three-phase motor according to an embodiment of the present application. The charging control device of the three-phase motor may be implemented by software, hardware or a combination of the two, and may be, for example, the controller in the above embodiment, to execute the charging control method of the three-phase motor in the above embodiment. As shown in fig. 8, the charge control device 800 for a three-phase motor includes:
an obtaining module 801, configured to obtain a current position of a rotor in a three-phase motor;
the control module 802 is configured to determine a duty ratio of a bridge arm corresponding to a current position of the rotor according to a mapping relationship between the position of the rotor and the duty ratio of the bridge arm in the converter corresponding to the three-phase motor; and adjusting the included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor according to the duty ratio of the bridge arm corresponding to the current position of the rotor.
In an optional embodiment, the control module 802 is specifically configured to determine a duty ratio of a first bridge arm and a duty ratio of a second bridge arm corresponding to the current position of the rotor, where the first bridge arm is a bridge arm corresponding to a first stator winding in the three-phase motor, the second bridge arm is a bridge arm corresponding to a second stator winding in the three-phase motor, the first stator winding is configured to output a first current vector, and the second stator winding is configured to output a second current vector.
In an alternative embodiment, the sum of the duty cycle of the first leg and the duty cycle of the second leg is 1.
In an optional embodiment, the control module 802 is specifically configured to adjust an included angle between a total current vector of a stator winding in the three-phase motor and a position of a permanent magnet flux linkage of the rotor within a preset included angle adjustment range.
In an alternative embodiment, the converter comprises a dc-dc converter and/or an ac-dc converter.
It should be noted that the charging control device for a three-phase motor according to the embodiment shown in fig. 8 may be used to execute the charging control method for a three-phase motor according to any of the embodiments described above, and the specific implementation manner and the technical effect are similar, and are not described again here.
An embodiment of the present application further provides an electric vehicle, including: a battery and a charge control circuit; the charging control circuit is connected with the battery, and a controller in the charging control circuit is used for executing the charging control method of the three-phase motor provided by the method embodiment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (12)

1. A charge control method of a three-phase motor, characterized by comprising:
acquiring the current position of a rotor in the three-phase motor;
determining the duty ratio of a bridge arm corresponding to the current position of the rotor according to the mapping relation between the position of the rotor and the duty ratio of the bridge arm in a converter corresponding to the three-phase motor;
and adjusting an included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor according to the duty ratio of the bridge arm corresponding to the current position of the rotor.
2. The method of claim 1, wherein the determining the duty cycle of the bridge arm corresponding to the current position of the rotor comprises:
and determining a duty ratio of a first bridge arm and a duty ratio of a second bridge arm corresponding to the current position of the rotor, wherein the first bridge arm is a bridge arm corresponding to a first stator winding in the three-phase motor, the second bridge arm is a bridge arm corresponding to a second stator winding in the three-phase motor, the first stator winding is used for outputting a first current vector, and the second stator winding is used for outputting a second current vector.
3. The method of claim 2, wherein the sum of the duty cycle of the first leg and the duty cycle of the second leg is 1.
4. The method of claim 1, wherein said adjusting an angle between a total current vector of stator windings in said three-phase electric machine and a position of a permanent magnet flux linkage of said rotor comprises:
and adjusting the included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor within a preset included angle adjusting range.
5. The method according to any of claims 1-4, wherein the converter comprises a DC-DC converter and/or an AC-DC converter.
6. A charge control device for a three-phase motor, the device comprising:
the acquisition module is used for acquiring the current position of a rotor in the three-phase motor;
the control module is used for determining the duty ratio of a bridge arm corresponding to the current position of the rotor according to the mapping relation between the position of the rotor and the duty ratio of the bridge arm in the converter corresponding to the three-phase motor; and adjusting an included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor according to the duty ratio of the bridge arm corresponding to the current position of the rotor.
7. The device according to claim 6, wherein the control module is specifically configured to determine a duty ratio of a first bridge arm and a duty ratio of a second bridge arm corresponding to the current position of the rotor, where the first bridge arm is a bridge arm corresponding to a first stator winding in the three-phase motor, the second bridge arm is a bridge arm corresponding to a second stator winding in the three-phase motor, the first stator winding is configured to output a first current vector, and the second stator winding is configured to output a second current vector.
8. The apparatus of claim 7, wherein a sum of the duty cycle of the first leg and the duty cycle of the second leg is 1.
9. The device according to claim 6, wherein the control module is specifically configured to adjust an angle between a total current vector of a stator winding in the three-phase motor and a position of a permanent magnet flux linkage of the rotor within a preset angle adjustment range.
10. An arrangement according to any of claims 6-9, characterized in that the converter comprises a dc-dc converter and/or an ac-dc converter.
11. A charge control circuit for a three-phase motor, the circuit comprising:
a controller, a three-phase motor and an inverter;
the controller is respectively connected with the three-phase motor and the converter, and the three-phase motor is connected with the converter;
wherein the controller is configured to: acquiring the current position of a rotor in the three-phase motor; determining the duty ratio of a bridge arm corresponding to the current position of the rotor according to the mapping relation between the position of the rotor and the duty ratio of the bridge arm in a converter corresponding to the three-phase motor; and adjusting an included angle between the total current vector of the stator winding in the three-phase motor and the position of the permanent magnet flux linkage of the rotor according to the duty ratio of the bridge arm corresponding to the current position of the rotor.
12. An electric vehicle, characterized by comprising: a battery and a charge control circuit; the charge control circuit is connected to the battery, and a controller in the charge control circuit is configured to perform the method of any one of claims 1 to 5.
CN202210266142.7A 2022-03-17 2022-03-17 Charging control method, device and circuit of three-phase motor and electric vehicle Pending CN114567225A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210266142.7A CN114567225A (en) 2022-03-17 2022-03-17 Charging control method, device and circuit of three-phase motor and electric vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210266142.7A CN114567225A (en) 2022-03-17 2022-03-17 Charging control method, device and circuit of three-phase motor and electric vehicle

Publications (1)

Publication Number Publication Date
CN114567225A true CN114567225A (en) 2022-05-31

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Country Status (1)

Country Link
CN (1) CN114567225A (en)

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