Electromechanical control circuit, electric drive assembly system and vehicle

Abstract

An electromechanical control circuit (100), an electric drive assembly system, and a vehicle are disclosed. The electromechanical control circuit (100) includes a three-phase AC electromechanical machine (111) and a three-phase inverter (112). In the electromechanical drive mode, the three-phase inverter (112) is configured to receive DC power from an external power battery (200) and output AC power for driving the three-phase AC electromechanical machine (111). In the DC boost charging mode, the three-phase windings in the wire slots of the electromechanical stator of the three-phase AC electromechanical machine (111) are used as inductive energy storage elements (La, Lb, Lc) of a DC boost charging circuit. The inductive energy storage elements (La, Lb, Lc) and the three-phase inverter (112) cooperate to form a DC boost charging circuit. As a result, an external power module charges the external power battery (200) through the DC boost charging circuit. The three-phase inverter (112) is provided, and the wire slots are at least 54 wire slots.

Description

Technical Field

[0001] The present disclosure relates to the field of electromechanical control, and in particular, to an electromechanical control circuit, an electric drive assembly system, and a vehicle.

Background Art

[0002] The widespread use of vehicles, especially electric vehicles in the civilian and commercial sectors, has imposed higher requirements on the vehicle charging process.

[0003] Currently, when the voltage of the charging post (i.e., the external power supply module) is lower than the voltage of the power battery during rapid DC charging of the vehicle power battery, the power battery is charged using a DC boost charging method, that is, a DC boost charging circuit is provided between the external power supply module and the power battery to realize the boost charging process. However, when an additional DC boost charging circuit is provided, the structural complexity and volume of the vehicle's internal circuit increase significantly, the flexibility of the dedicated circuit decreases, and when the vehicle's inverter and AC electromechanical machine are used for the additional purpose of forming a DC boost charging circuit, generally, in the existing AC electromechanical structure configuration, the requirements of the boost charging process cannot be met only by using the inductance of the three-phase winding of the AC electromechanical machine. Therefore, generally, an additional inductive element is further provided in the DC boost charging circuit to realize the boost charging function. However, by providing an additional inductive energy storage module, the complexity of the vehicle's internal circuit structure inevitably increases, and thus the manufacturing cost rises. Furthermore, there is still room for further improving the performance of the AC electromechanical machine in existing vehicles. In particular, in order to meet the corresponding driving demand, it is necessary to further increase the output rotation speed of the AC electromechanical machine and realize a high rotation speed electromechanical machine.

[0004] Therefore, there is a need for an electromechanical control circuit that can realize the boosting charging process of an external power supply module for a power battery in a simple and convenient manner according to actual needs while also realizing effective control of the electromechanical components of a vehicle. The electromechanical control circuit is structurally simple and has high reliability and flexibility during use. In particular, it does not require additional inductive elements, and the boosting charging function can be realized by the three-phase windings of an AC electromechanical component that functions as an inductive energy storage element in a DC boosting charging circuit. In particular, the electromechanical component in the electromechanical control circuit can, for example, have a high output rotation speed.

Summary of the Invention

[0005] In response to the above problems, the present disclosure provides an electromechanical control circuit, an electric drive assembly system, and a vehicle.

[0006] According to one aspect of the present disclosure, an electromechanical control circuit including a three-phase AC electromechanical component and a three-phase inverter is proposed. In the electromechanical drive mode, the three-phase inverter is configured to receive DC power from an external power battery and output AC power for driving the three-phase AC electromechanical component. In the DC boosting charging mode, the three-phase windings in the wire slots of the electromechanical stator of the three-phase AC electromechanical component are used as the inductive energy storage element of the DC boosting charging circuit, and the inductive energy storage element and the three-phase inverter cooperate to form a DC boosting charging circuit. As a result, the external power supply module charges the external power battery through the DC boosting charging circuit, and the wire slots are at least 54 wire slots.

[0007] In some embodiments, the inductive energy storage element is formed only by the three-phase windings in the wire slots of the electromechanical stator of the three-phase AC electromechanical component.

[0008] In some embodiments, the wire slots are 54 wire slots, 60 wire slots, 66 wire slots, or 72 wire slots.

[0009] In some embodiments, the electromechanical stator has six poles.

[0010] In some embodiments, the electromechanical stator has eight poles and the wire slots are seventy-two wire slots.

[0011] In some embodiments, in the DC boost charging mode, the first end of the three-phase inverter is electrically connected to an external power battery, the second end of the three-phase inverter is electrically connected to an external power module and an external power battery, the midpoints of the three-phase bridge arms of the three-phase inverter are respectively connected to the corresponding ends of the three-phase windings of the three-phase AC electromechanical machine, and the other ends of the three-phase windings of the three-phase AC electromechanical machine are electrically connected to the external power module through a common connection point.

[0012] In some embodiments, in the DC boost charging mode, the common connection point of the three-phase windings of the three-phase AC electromechanical machine is electrically connected to the external power module, and as a result, no additional inductive element is provided between the common connection point and the external power module.

[0013] In some embodiments, the nominal rotational speed of the three-phase AC electromechanical machine is at least 17,000 revolutions per minute.

[0014] In some embodiments, the nominal rotational speed of the three-phase AC electromechanical machine is 20,000 revolutions per minute.

[0015] According to another aspect of the present disclosure, an electric drive assembly system including the above-described electromechanical control circuit is further proposed.

[0016] According to another aspect of the present disclosure, a vehicle including the above-described electric drive assembly system is further proposed.

[0017] As a result of using the electromechanical control circuit, the electric drive assembly system, and the vehicle provided in the present disclosure, first, the electromechanical device of the vehicle can be effectively controlled by the electromechanical control circuit; second, according to actual needs, the electromechanical control circuit can be additionally used as a DC boost charging circuit, thereby realizing the boost charging process of the external power supply module for the power battery in a simple and convenient manner. The electromechanical control circuit is structurally simple and has high reliability and flexibility during use; third, the electromechanical device in the electromechanical control circuit can have a high output rotation speed in the drive mode for moving the vehicle forward.

[0018] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings used in describing the embodiments are briefly described below. Obviously, the drawings described below show only some embodiments of the present disclosure, and those skilled in the art can obtain other drawings based on these drawings without creative efforts. The following drawings are not drawn with meticulous attention to scale with actual dimensions, but focus on showing the essence of the present disclosure.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 4

DETAILED DESCRIPTION OF THE INVENTION

[0020] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without inventive efforts shall also fall within the protection scope of the present disclosure.

[0021] As shown in this application and the claims, unless otherwise explicitly specified in the context, words such as "a", "one", "one type", and / or "the" do not particularly mean the singular form and may include the plural form. Generally, the terms "comprise" and "include" only indicate that the explicitly specified steps and elements are included, but these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements.

[0022] Currently, during the rapid DC charging of a vehicle power battery, when the voltage of the charging post (i.e., the external power supply module) is lower than the voltage of the power battery, a boost charging method is used to charge the power battery. That is, in order to implement the boost charging method, a DC boost charging circuit is provided between the external power supply module and the power battery. However, when an additional DC boost charging circuit is provided, the structural complexity and volume of the vehicle's internal circuit increase significantly, the flexibility of the dedicated circuit decreases, and when the vehicle's inverter and AC electrical machine are used for the additional purpose of forming a DC boost charging circuit, generally, in the existing AC electrical machine structure configuration, the requirements of the boost charging process cannot be met by only using the inductance of the three-phase winding of the AC electrical machine. Therefore, generally, an additional inductive element is further provided in the DC boost charging circuit to realize the boost charging function. However, by providing an additional inductive energy storage module, inevitably, the complexity of the vehicle's internal circuit structure increases, and thus the manufacturing cost rises. In addition, considering the existing driving needs, it is also desirable to further increase the rotational speed of the electrical machine in order to realize an electrical machine with a high rotational speed.

[0023] Therefore, according to the actual needs, the present application proposes an electrical machine control circuit that can realize the boost charging process of the external power supply module for the power battery in a simple and convenient manner and can also realize effective control of the vehicle's electrical machine. This electrical machine control circuit is structurally simple, has high reliability and flexibility during use, and the rotational speed output by the electrical machine in the electrical machine control circuit is higher.

[0024] According to one aspect of the present disclosure, an electrical machine control circuit 100 is proposed. FIG. 1 shows a schematic block diagram of the electrical machine control circuit 100 according to an embodiment of the present disclosure.

[0025] Referring to FIG. 1, the electrical machine control circuit 100 includes, for example, a three-phase AC electrical machine 111 and a three-phase inverter 112.

[0026] The three-phase AC electrical machine 111 is an AC electrical machine having a three-phase winding, and may be, for example, a synchronous electrical machine or an asynchronous electrical machine, such as a permanent magnet synchronous electrical machine. However, it should be understood that the embodiments of the present disclosure are not limited in terms of a specific type of electrical machine of the three-phase AC electrical machine.

[0027] The three-phase inverter 112 is an electronic device that converts DC power into three-phase AC power. For example, by connecting the midpoints of the three-phase bridge arms of the three-phase inverter to the three-phase windings of the three-phase AC electrical machine respectively, the connection between the three-phase inverter and the three-phase AC electrical machine is realized. Specifically, the three-phase inverter includes six switching control elements, and these switching control elements may be, for example, transistors, MOS transistors or other devices. Each pair of the switching control elements forms a one-phase bridge arm together, and a plurality of pairs form a three-phase bridge arm together. The connection points of the two switching control elements in each phase of the bridge arm are connected to one-phase winding of the three-phase AC electrical machine.

[0028] However, in the above, only one exemplary structure of the three-phase inverter is shown, and it should be understood that other types of devices, such as IGBT devices, can also be selected as the switching control elements.

[0029] Furthermore, the electric machine control circuit can be configured, for example, for an electric machine driving mode or a DC boost charging mode. In the electric machine driving mode, the three-phase AC electrical machine receives electric machine operation control by the three-phase inverter based on the vehicle's power battery (i.e., the external power battery 200). In the DC boost charging mode, when it is necessary to charge the vehicle's power battery 200, if the charging voltage of the connected power module (i.e., the external power module 300) (for example, DC400 - 500V) is not higher than the voltage of the power battery 200 (DC500 - 1000V), the power module cannot fully charge the power battery, and it is necessary to boost the voltage of the power module before charging the power battery 200.

[0030] In the electromechanical drive mode, the three-phase inverter receives DC power from the external power battery 200 and outputs AC power for driving a three-phase AC electromechanical device.

[0031] For example, if the three-phase inverter has a three-phase bridge arm and six switching control elements, for example, each phase of the bridge arm has two switching control elements, and the on / off states of the upper and lower bridge arms of this bridge arm are controlled separately, at this time, for example, by controlling the on / off states of the six switching control elements, it is possible to control the current and / or voltage of each phase winding of the three-phase AC electromechanical device connected to the three-phase bridge arm, and thereby drive the three-phase AC electromechanical device based on the external power battery 200.

[0032] In the DC boost charging mode, the three-phase windings in the wire slots of the electromechanical stator of the three-phase AC electromechanical device are used as the inductive energy storage element of the DC boost charging circuit. The inductive energy storage element and the three-phase inverter cooperate to form a DC boost charging circuit. As a result, the external power supply module 300 charges the external power battery 200 through the DC boost charging circuit.

[0033] For example, in the DC boost charging mode, the three-phase windings of the three-phase AC electric machine receive DC power from the external power module 300 and are simultaneously used as the inductive energy storage element of the DC boost charging circuit. The three-phase bridge arms of the three-phase inverter may be controlled to be in the first on / off state. As a result, the external power module 300 first charges the three-phase windings of the three-phase AC electric machine through the three-phase inverter. When the charging of the three-phase windings of the three-phase AC electric machine is completed, the three-phase bridge arms of the three-phase inverter are controlled to be in the second on / off state. As a result, the power module and the three-phase windings of the three-phase AC electric machine together discharge to the power battery 200. At this time, since the three-phase windings also output voltage during the discharging process, this corresponds to the superposition of the voltage of the three-phase windings and the voltage of the power module. As a result, the process of boosting the voltage of the external power module 300 is realized. Therefore, the external power module 300 can effectively realize the boost charging of the external power battery 200.

[0034] Furthermore, the wire slots are at least 54 wire slots (hereinafter also referred to as wire slots). The wire slots refer to the wire slots of the electric machine stator of the three-phase AC electric machine and are used to accommodate the three-phase windings.

[0035] For example, in the case of a three-phase AC electric machine having 48 wire slots, it has 16 wire slots corresponding to the windings of each phase, that is, the number of turns connected in series of the windings of each phase of the electric machine is 16. When an electric machine having 54 wire slots is used, it has 18 wire slots corresponding to the windings of each phase, that is, the number of turns connected in series of the windings of each phase of the electric machine is 18. By comparison, by using the structure with 54 wire slots, the number of wire slots of the windings of each phase can be significantly increased. Considering the correspondence between the number of wire slots in the stator and the number of series-connected windings, it is obvious that the number of series connections of the windings of each phase of the three-phase windings increases significantly. Thereby, the inductance of the windings of each phase of the three-phase windings increases significantly.

[0036] Therefore, in this application, by setting the number of wire slots of the electromechanical stator to at least 54, it becomes possible to increase the inductance of the three-phase winding accordingly. When the three-phase winding is used as the inductive energy storage element of the DC boost charging circuit, since the electrical energy stored by the inductor is directly proportional to the inductance of the inductor, the amount of charge that can be stored in the inductive energy storage element increases, and thus the output power increases. Therefore, the performance is improved in the process of supplying the power battery for boost charging. Specifically, when outputting low power, the voltage drop of the three-phase winding with high inductance is smaller than that of the three-phase winding with low inductance when outputting the same power, so the voltage stability and reliability of the boost charging process can be ensured.

[0037] In addition, compared with the 48 wire slots currently commonly used, setting the number of wire slots of the electromechanical stator to at least 54 makes it easier to consider the high rotational speed and high torque output of the electromechanical simultaneously.

[0038] Specifically, first, the size of the rotor arranged in the electromechanical machine becomes smaller by configuring the electromechanical machine to have at least 54 wire slots. Using this rotor with a smaller radius helps to increase the output rotational speed of the electromechanical machine.

[0039] Second, despite the decrease in the radius of the rotor, since the number of wire slots (at least 54) in the stator has increased, the torque of the electromechanical machine can still be maintained at a high level to meet the driving requirements. Here, the process of maintaining high torque by setting at least 54 wire slots will be described in more detail.

[0040] Specifically, the formula for the total torque of the electromechanical machine is as follows.

Equation

[0041] Based on the operating characteristics of the electromechanical device and the formula for the total torque of the electromechanical device, it is known that the total torque of the electromechanical device is related to several parameters such as the radius of the rotor, the number of windings connected in series in each phase (corresponding to the number of wire slots of the stator in each phase), the current, and the number of pole pairs.

[0042] Therefore, when the radius of the rotor is reduced, if the number of stator wire slots is set to at least 54, compared with the case where the number of wire slots is 48 in the prior art, the number of wire slots increases significantly (i.e., the number of turns connected in series in each phase increases), and as a result, based on the reduction of the outer diameter of the rotor, the electromechanical torque is still maintained at a high level (a high rotational speed is achieved).

[0043] Specifically, in an electromechanical device with a high rotational speed (for example, the rated rotational speed is 17,000 revolutions per minute or more), the outer diameter of the electromechanical rotor will be further reduced. In this case, by increasing the number of wire slots to 54 or more while reducing the outer diameter of the rotor to increase the rotational speed, it is possible to maintain the same output torque as when the outer diameter of the rotor is not reduced.

[0044] It should be understood that in order to further increase the inductance of the three-phase AC winding and improve the electromechanical characteristics, according to actual needs, a larger number of wire slots, such as 60 wire slots, 66 wire slots, etc., can be set.

[0045] Based on the above, in the present application, first, in the electromechanical drive mode, the electromechanical control circuit is configured to receive DC power from an external power battery by a three-phase inverter and output AC power for driving a three-phase AC electromechanical, so that the electromechanical can be effectively controlled in this way. In the DC boost charging mode, the three-phase windings in the wire slots of the electromechanical stator are configured to be used as an inductive energy storage element of the DC boost charging circuit, and the inductive energy storage element and the three-phase inverter cooperate to form a DC boost charging circuit. As a result, the external power module charges the external power battery by the DC boost charging circuit. Thus, the electromechanical control circuit can be used for the additional purpose of realizing a boost charging process for the external power battery. Further, compared with the electromechanical control circuit currently applied to the DC boost charging circuit (the number of wire slots in the stator of the three-phase AC electromechanical is generally 48), by setting the number of wire slots in the stator to at least 54, that is, by increasing the number of wire slots in the electromechanical stator, the inductance of the three-phase windings of the electromechanical can be effectively increased. As a result, when the three-phase windings are used as the inductive energy storage element of the DC boost charging circuit, the voltage stability and reliability of the boost charging process are ensured, and thus an efficient and reliable charging process can be realized. In addition, increasing the number of wire slots in the stator also helps to optimize the structure of the three-phase AC electromechanical and realize high rotational speed and high torque output. Therefore, the design in the present application can simultaneously realize the optimization of the boost charging function (high electromechanical inductance) and the optimization of the output performance of the electromechanical itself (high electromechanical rotational speed).

[0046] In some embodiments, the inductive energy storage element is formed only by the three-phase windings in the wire slots of the electromechanical stator of the three-phase AC electromechanical 111.

[0047] In this application, as a result of configuring to form an inductive energy storage element only by the three-phase windings in the wire slots of the electric machine stator of the three-phase AC electric machine 111, the boost charging process for the power battery in the DC boost charging mode can be effectively realized by the inductive energy storage element formed by the three-phase windings in at least 54 wire slots without the need for additional components, and in particular, without the need for additional inductive elements to assist the boost charging process. Therefore, the circuit structure of the DC boost charging circuit is significantly simplified and the cost is reduced.

[0048] In some embodiments, the wire slots are 54 wire slots, 60 wire slots, 66 wire slots, or 72 wire slots.

[0049] Configuring the wire slots of the stator to be 60, 66, or 72, based on considering the operating performance of the electric machine at the same time, first, because the number of wire slots in the stator is large, it is possible to further increase the inductance of the three-phase windings of the electric machine, and an effect that a stable and highly reliable boost charging process can be effectively realized; second, by increasing the number of wire slots in the stator, it is possible to reduce the rotor diameter to obtain a high rotational speed output, and at the same time, it is also possible for the electric machine to maintain a high torque output, which has the effect of helping to achieve the high rotational speed and high torque output of the electric machine.

[0050] In some embodiments, the electric machine stator has 6 poles.

[0051] Providing 6 poles helps to reduce the core loss of the electric machine. Specifically, the formula for the core loss of the electric machine is as follows.

[0052] CoreLoss = k h fB 2 +k C f 2 B 2 +k e (fB)1.5 2) Here, CoreLoss represents the core loss of the electrical machine, and k h , k C and k e are parameters selected according to actual needs, f is the operating frequency of the electrical machine, and B represents the magnitude of the external magnetic field.

[0053] From the above, it is known that the core loss of the electrical machine is directly proportional to the operating frequency of the electrical machine, and it is known that the operating frequency of the electrical machine is related to the rotational speed of the electrical machine and the number of pole pairs of the electrical machine. Therefore, selecting a smaller number of poles (i.e., reducing the number of pole pairs) can lower the operating frequency of the electrical machine, and as a result, the core loss of the electrical machine is known to be reduced, and thus the efficiency of the electrical machine is improved.

[0054] In the present application, by configuring the electrical machine stator to have 6 poles, first, the core loss can be reduced compared to an electrical machine stator having 8 poles, thereby improving the electrical machine performance. Second, the 6 poles correspond to the cases where the number of wire slots of the stator is 54, 60, 66, and 62, and while increasing the inductance of the three-phase winding of the electrical machine, good electrical machine operating characteristics can be realized.

[0055] Particularly preferably, the electrical machine stator can be configured to have, for example, 54 wire slots and 6 poles, whereby, based on using an electrical machine control circuit for an additional purpose of boost charging, high winding inductance, high nominal rotational speed, and low core loss can be realized, and at the same time, the complexity of the manufacturing process can be reduced.

[0056] In some embodiments, the electrical machine stator has 8 poles and the wire slots are 72 wire slots.

[0057] Based on the above, in the present application, by configuring the electromechanical stator to have 8 poles and 72 wire slots, that is, when the pole configuration of the stator is 8 poles, 72 wire slots are provided to conform to this configuration, and the effect that good electromechanical operating performance can be obtained is achieved. Furthermore, by increasing the number of wire slots of the electromechanical device, the inductance of the three-phase windings of the electromechanical device can be increased more, and it becomes easier to consider both the high rotational speed and high torque output of the electromechanical device simultaneously.

[0058] In some embodiments, the method of connecting a three-phase inverter and a three-phase AC electromechanical device can be described in more detail, for example. FIG. 2 shows a circuit diagram of an electromechanical control circuit 100 according to an embodiment of the present disclosure.

[0059] Referring to FIG. 2, a three-phase AC electromechanical device 111, a three-phase inverter 112, an external power battery 200, and an external power supply module 300 are shown.

[0060] Furthermore, as shown in FIG. 2, in the DC boost charging mode, the first end 112a of the three-phase inverter 112 is electrically connected to the external power battery 200, and the second end 112b of the three-phase inverter 112 is electrically connected to the external power supply module 300 and the external power battery 200.

[0061] Furthermore, the midpoints of the three-phase bridge arms of the three-phase inverter 112 are respectively connected to the corresponding ends of the three-phase windings of the three-phase AC electromechanical device, and the other ends of the three-phase windings of the three-phase AC electromechanical device are electrically connected to the external power supply module 300 via a common connection point N.

[0062] For example, referring to FIG. 2, the midpoint of the first-phase bridge arm in the three-phase bridge arm is, for example, a, and the midpoint a of the first-phase bridge arm is connected to the corresponding end of the first-phase winding La, for example. The midpoint b of the second-phase bridge arm is connected to the corresponding end of the second-phase winding Lb, for example, and the midpoint c of the third-phase bridge arm is connected to the corresponding end of the third-phase winding Lc, for example.

[0063] Based on the above, in this application, by configuring a specific connection relationship between the three-phase inverter and the three-phase AC electrical machine, specifically, the first end of the three-phase inverter is electrically connected to an external power battery, and the second end of the three-phase inverter is configured to be electrically connected to an external power supply module and an external power battery. The midpoints of the three-phase bridge arms of the three-phase inverter are respectively connected to the corresponding ends of the three-phase windings of the three-phase AC electrical machine, and the other ends of the three-phase windings of the three-phase AC electrical machine are electrically connected to the external power supply module through a common connection point. In this way, the electric machine control circuit can effectively perform its functions in both the electric machine drive mode and the DC boost charging mode. In particular, due to this connection relationship, in the DC boost charging mode, it becomes easy to additionally use the three-phase windings of the three-phase AC electrical machine as inductive energy storage elements, and the boost charging process for the external power battery can be realized.

[0064] In some embodiments, as shown in FIG. 2, in the DC boost charging mode, the common connection point N of the three-phase windings of the three-phase AC electrical machine is electrically connected to the external power supply module 300. As a result, no additional inductive element is provided between the common connection point N and the external power supply module 300.

[0065] The statement "The common connection point N of the three-phase windings of the three-phase AC electrical machine is electrically connected to the external power supply module 300, and as a result, no additional inductive element is provided between the common connection point N and the external power supply module 300" that appears at this point in this application is for explaining that no inductive element for assisting the boosting operation is provided between these two electrical components, namely the common connection point N and the external power supply module 300. It should be understood that it is not for imposing a restriction that no additional electrical component is provided between these two electrical elements. Depending on actual needs, in order to achieve a stable and highly reliable connection between the three-phase windings and the external power supply module, it is generally possible to provide another electrical element, such as a switching element K1, a relay, a connector, or another electrical component, etc., between the common connection point N of the three-phase windings of the three-phase AC electrical machine and the external power supply module 300.

[0066] Furthermore, the second end of the three-phase inverter is electrically connected to the external power supply module, and as a result, no additional inductive element is provided between the second end of the three-phase inverter and the external power supply module.

[0067] The statement "No additional inductive element is provided between the second end of the three-phase inverter and the external power supply module" that appears at this point in this application is for explaining that no inductive element for assisting the boosting operation is provided between these two electrical components. It should be understood that it is not for imposing a restriction that no additional electrical element is provided between these two electrical components. Depending on actual needs, another electrical element such as a switching element K2 may be provided between the second end of the three-phase inverter and the external power supply module.

[0068] Based on the above, without providing an additional inductive element between the common connection point of the three-phase windings of the three-phase AC electrical machine and the external power supply module, and without providing an additional inductive element between the second end of the three-phase inverter and the external power supply module, as a result, based on using the electric machine control circuit for an additional purpose of boost charging, only the three-phase windings of the three-phase AC electrical machine having at least 54 wire slots are used as the inductive energy storage element in the DC boost charging circuit. Therefore, while effectively realizing the boost charging function, the volume of the DC boost charging circuit can be significantly reduced, and the structural complexity of the circuit is reduced.

[0069] In some embodiments, the nominal rotational speed of the three-phase AC electrical machine is at least 17,000 revolutions per minute.

[0070] For example, according to the actual needs, the nominal rotational speed of the three-phase AC electrical machine can reach, for example, 17,000 revolutions per minute, 18,000 revolutions per minute, 19,000 revolutions per minute, or 20,000 revolutions per minute.

[0071] Based on the above, in this application, by appropriately configuring the poles and wire slots of the three-phase AC electrical machine, for example, by configuring 54 wire slots and 6 poles, the three-phase AC electrical machine can achieve a high nominal rotational speed, such as a nominal rotational speed of 17,000 revolutions per minute or more. As a result, the three-phase AC electrical machine can effectively realize a high rotational speed output, and therefore, the operating performance of the three-phase AC electrical machine is effectively improved.

[0072] In some embodiments, the nominal rotational speed of the three-phase AC electrical machine is 20,000 revolutions per minute.

[0073] The configuration of the magnetic poles and wire slots of the three-phase AC electrical machine in this application enables the rated rotational speed of the three-phase AC electrical machine to reach 20,000 revolutions per minute. Compared with the existing rated rotational speed of 16,000 revolutions per minute, the output rotational speed of the three-phase AC electrical machine can be significantly increased in this application, realizing a higher rotational speed output, further improving the operating performance of the three-phase AC electrical machine, and helping the three-phase AC electrical machine to adapt to various different application scenarios.

[0074] Here, the electrical machine control circuit 100 shown in FIG. 2 and its DC boost charging mode will be described in more detail with reference to, for example, a specific application scenario.

[0075] Referring again to FIG. 2, a three-phase AC electrical machine 111, a three-phase inverter 112, an external power battery 200, and an external power supply module 300 are shown. Further, the three-phase AC electrical machine 111 is, for example, a permanent magnet synchronous electrical machine, and is of a three-phase four-wire type, that is, current is input and output via an N wire drawn from the connection point N of the three-phase windings.

[0076] The three-phase inverter includes six switching control elements. The switching control elements are transistors. The upper and lower switching control elements form a one-phase bridge arm, and these bridge arms are combined to form a three-phase bridge arm. Specifically, transistor VT1 and transistor VT2 constitute the first-phase bridge arm, transistor VT3 and transistor VT4 constitute the second-phase bridge arm, and transistor VT5 and transistor VT6 constitute the third-phase bridge arm. As described above, the midpoints of the three-phase bridge arms of the three-phase inverter are respectively connected to the corresponding ends of the three-phase windings of the three-phase AC electrical machine.

[0077] Diodes D1, D2, D3, D4, D5, and D6 are also provided in the three-phase inverter. Each switching control unit of the three-phase inverter is connected in anti-parallel with the corresponding diode. For example, taking the first bridge arm as an example, the transistor VT1 of the upper bridge arm and the diode D1 are connected in anti-parallel, and the transistor VT2 of the lower bridge arm and the diode D2 are connected in anti-parallel. Further, capacitors C1 and C2 are also provided in the circuit. Capacitor C1 is connected in parallel with the external power battery, and capacitor C2 is connected in parallel with the external power supply module. The capacitances of capacitors C1 and C2 can be selected according to actual needs, for example.

[0078] Furthermore, switches K1 and K2 are also provided in the circuit. They are configured to be in the off state or on state according to the operating mode of the electromechanical control circuit, connect the external power supply module 300 during the boost charging process, and disconnect the external power supply module from the electromechanical control circuit during the electromechanical drive process, thereby preventing the power supply module from affecting the electromechanical drive process.

[0079] Here, the boost charging process will be described in more detail with reference to FIGS. 3A and 3B. The boost charging process includes, for example, a first stage and a second stage. In the first stage, the external power supply module charges the three-phase windings of the three-phase AC electromechanical device. In the second stage, the external power supply module and the three-phase windings of the three-phase AC electromechanical device charge the power battery together. FIG. 3A shows the direction of current flow when the electromechanical control circuit 100 of FIG. 2 is in the first stage of the DC boost charging mode. In this stage, the external power supply module charges the three-phase windings of the three-phase AC electromechanical device. FIG. 3B shows the direction of current flow when the electromechanical control circuit 100 of FIG. 2 is in the second stage of the DC boost charging mode. In this stage, the external power supply module and the three-phase windings of the three-phase AC electromechanical device charge the power battery together.

[0080] Referring to FIG. 3A, in the DC boost charging mode, first, in the first stage, the external power supply module charges the three-phase windings of the three-phase AC electrical machine. At this time, switches K1 and K2 are in the closed state, and as a result, the external power supply module can be connected to the electrical machine control circuit. The external power supply module mentioned here may be, for example, a DC charging post on the road. Further, at this time, the three-phase windings in the wire slots of the electrical machine stator of the three-phase AC electrical machine 111 are used as the inductive energy storage element of the DC boost charging circuit, and the inductive energy storage element and the three-phase inverter 112 cooperate to form the DC boost charging circuit. At this time, the transistors VT2, VT4, VT6 of the three-phase inverter are controlled to be in the on state, while the transistors VT1, VT3, VT5 of the three-phase inverter are controlled to be in the off state. As a result, all of the lower bridge arms of the three-phase bridge arms of the three-phase inverter are in the on state, and all of the upper bridge arms of the three-phase bridge arms are in the off state. At this time, the first charging loop is formed by the external power supply module, the three-phase windings Lc, Lb, La of the three-phase AC electrical machine, and the three-phase lower bridge arms in the three-phase inverter. The external power supply module charges the three-phase windings of the three-phase AC electrical machine through, for example, the first charging loop, and the flow direction of the current in the first charging loop is as shown in FIG. 3A.

[0081] Subsequently, referring to FIG. 3B, after charging the three-phase windings of the three-phase AC electrical machine, in the second stage, the transistors VT1, VT3, VT5, VT2, VT4, VT6 of the three-phase inverter can be further controlled to, for example, all be in the off state. At this time, all the lower bridge arms of the three-phase bridge arms are in the off state, and the three-phase windings of the three-phase AC electrical machine can be connected to the power battery via the diodes D1, D3, D5 in the upper bridge arm of the three-phase inverter, for example. At this time, the external power supply module, the three-phase windings Lc, Lb, La of the three-phase AC electrical machine, and the three-phase upper bridge arm in the three-phase inverter form a second charging loop, and the output voltage of the external power supply module and the output voltage of the three-phase windings are superimposed and used together to charge the power battery. As a result, the voltage of the external power supply module is boosted, thereby realizing a stable and highly reliable boost charging process.

[0082] Furthermore, the three-phase AC electrical machine has, for example, an electrical machine structure having 54 wire slots and 6 poles.

[0083] As described above, the 54-wire slot configuration significantly increases the inductance of the three-phase windings of the three-phase AC electrical machine. For example, compared with the 48-wire slot configuration (where the winding of each phase corresponds to 16 wire slots, i.e., a series-connected winding with 16 turns), in the 54-wire slot configuration, the winding of each phase corresponds to 18 wire slots, i.e., the winding of each phase has a series-connected winding with 18 turns. Thereby, the number of turns of the series-connected windings of each phase is significantly increased, and thereby the inductance of the windings of each phase is increased.

[0084] Moreover, by configuring 54 wire slots, the performance of the electromechanical device itself is also optimized. First, the 54-wire slot configuration enables the accommodation of an electromechanical rotor with a smaller outer diameter, and the reduction in the outer diameter of the rotor helps to achieve a high rotational speed output of the electromechanical device. Second, while achieving a high rotational speed, the 54-wire slot configuration also makes it easier to consider the output torque while increasing the rotational speed. Therefore, the electromechanical device has not only a high rotational speed but also a high output torque. In addition, by configuring the three-phase AC electromechanical device to have 6 poles, that is, by further configuring it to adopt a structural configuration of 54 wire slots and 6 poles, a reduction in core loss due to a small number of poles (6 poles) is realized.

[0085] FIG. 4 shows a graph comparing the performance of an electromechanical device having 54 wire slots and 6 poles according to an embodiment of the present disclosure with that of an electromechanical device having 48 wire slots and 8 poles.

[0086] Referring to FIG. 4, this shows the performance, particularly with respect to torque and power, when the rotational speed of an electromechanical device having 54 wire slots and an electromechanical device having 48 wire slots is changed. Specifically, the types of electromechanical devices compared here are an electromechanical device with 54 wire slots and 6 poles and an electromechanical device with 48 wire slots and 8 poles. From the graph comparing the electromechanical characteristics in FIG. 4, it can be seen that at each rotational speed setting, the power and torque performance of the electromechanical device having 54 wire slots is superior to that of the electromechanical device having 48 wire slots. In particular, in the electromechanical device having 54 wire slots, a rotor with a smaller outer diameter is used, but the output torque of the electromechanical device having 54 wire slots can still be maintained at substantially the same level as the output torque of the electromechanical device having 48 wire slots (where a rotor with a larger outer diameter is installed). The electromechanical device having 54 wire slots can maintain a high output torque while reducing the outer diameter of the rotor to achieve a high rotational speed, so that both a high rotational speed and a high torque output can be considered simultaneously.

[0087] According to another aspect of the present disclosure, for example, an electric drive assembly system including the above-described electromechanical control circuit is proposed.

[0088] The electric drive assembly system is a system used to realize drive control of a drive electric machine (three-phase AC electric machine) of a vehicle. The electric drive assembly system may further include other electrical components or devices, for example, according to actual needs. Embodiments of the present disclosure are not limited by a specific configuration of the electric drive assembly system or the type of components included therein.

[0089] Based on the above, in the present application, by configuring the electric drive assembly system to include an electromechanical control circuit, in the electromechanical drive mode, the three-phase inverter receives DC power from an external power battery and outputs AC power for driving a three-phase AC electromechanical device, enabling effective control of the electromechanical device. Further, in the DC boost charging mode, the three-phase windings in the wire slots of the electromechanical stator are used as the inductive energy storage element of the DC boost charging circuit, and the inductive energy storage element and the three-phase inverter cooperate to form a DC boost charging circuit. As a result, the external power module charges the external power battery through the DC boost charging circuit. Thus, the electromechanical control circuit can be used for the additional purpose of realizing a boost charging process for the external power battery. Further, compared with the electromechanical control circuit currently applied to the DC boost charging circuit (the number of wire slots in the stator of the three-phase AC electromechanical device is generally 48), by setting the number of wire slots in the stator to at least 54, that is, by increasing the number of wire slots in the electromechanical stator, the inductance of the three-phase windings of the electromechanical device can be effectively increased. As a result, when the three-phase windings are used as the inductive energy storage element of the DC boost charging circuit, the voltage stability and reliability of the boost charging process are ensured, and thus an efficient and reliable charging process can be realized. In addition, increasing the number of wire slots in the stator also helps to optimize the structure of the three-phase AC electromechanical device and achieve high rotational speed and high torque output. Therefore, the design in the present application can simultaneously realize the optimization of the boost charging function (high electromechanical inductance) and the optimization of the output performance of the electromechanical device itself (high electromechanical rotational speed).

[0090] In some embodiments, the electromechanical control circuit in the electric drive assembly system can have, for example, the above-described structure and can perform the above-described functions.

[0091] According to another aspect of the present disclosure, a vehicle is also proposed. The vehicle includes, for example, the above-described electric drive assembly system.

[0092] The vehicle is, for example, a pure electric vehicle or a hybrid vehicle.

[0093] Based on the above, in the present application, by configuring the vehicle to be equipped with an electric drive assembly system, in the electromechanical drive mode, a three-phase inverter receives DC power from an external power battery and outputs AC power for driving a three-phase AC electromechanical machine, so that the electromechanical machine can be effectively controlled. Further, in the DC boost charging mode, the three-phase windings of the wire slots of the electromechanical stator are used as an inductive energy storage element of the DC boost charging circuit, and the inductive energy storage element and the three-phase inverter cooperate to form a DC boost charging circuit. As a result, the external power module charges the external power battery through the DC boost charging circuit. In this way, the electromechanical control circuit can be used for the additional purpose of realizing a boost charging process for the external power battery, so that multiple different operation modes can be realized in a simple and convenient way while simplifying the internal circuit of the vehicle. Furthermore, by configuring the wire slots of the stator to have at least 54 wire slots, the inductance of the three-phase windings in the electromechanical machine can be effectively increased, the voltage stability and reliability of the boost charging process can be ensured, and an efficient and reliable charging process can be realized. In addition, the structure of the three-phase AC electromechanical machine is optimized, which helps to achieve high rotational speed and high torque output.

[0094] In some embodiments, the electric drive assembly system of the vehicle can include, for example, an electromechanical control circuit, can have, for example, the above-described structure, and can perform the above-described functions.

[0095] In this application, certain terms are used to describe the embodiments of this application. For example, "the first / second embodiment", "embodiment", and / or "some embodiments" refer to features, structures, or characteristics related to at least one embodiment of this application. Therefore, it should be noted that the "embodiment", "an embodiment", or "alternative embodiment" mentioned two or more times in different places in this specification does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0096] Unless otherwise defined, all terms (including technical and scientific terms) used in this specification shall have the same meaning as commonly understood by those skilled in the art. Terms that are generally defined in a dictionary shall not be construed in an idealized or overly formalized sense unless explicitly defined as such in this specification, but should be construed as having the same meaning as in the context of the related art.

[0097] The above is an explanation of the present disclosure and should not be considered as limiting the present disclosure. Although specific exemplary embodiments of the present disclosure have been described, those skilled in the art will readily understand that many modifications can be made to the exemplary embodiments without departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure as defined by the claims. It should be understood that the above is an explanation of the present disclosure and should not be considered as being limited to the specific embodiments disclosed, and in addition, modifications made to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims. The present disclosure is defined by the claims and their equivalents.

Claims

1. An electromechanical control circuit, comprising: a three-phase AC electromechanical machine; and a three-phase inverter configured, in an electromechanical drive mode, to receive DC power from an external power battery and output AC power for driving the three-phase AC electromechanical machine, and in a DC boost charging mode, the three-phase windings in the wire slots of the electromechanical stator of the three-phase AC electromechanical machine are used as an inductive energy storage element of a DC boost charging circuit, and the inductive energy storage element and the three-phase inverter cooperate to form the DC boost charging circuit, so that an external power module charges the external power battery through the DC boost charging circuit. A three-phase inverter, wherein the wire slots are at least 54 wire slots, the electromechanical control circuit.

2. The electromechanical control circuit according to claim 1, wherein the inductive energy storage element is formed only by the three-phase windings in the wire slots of the electromechanical stator of the three-phase AC electromechanical machine.

3. The electromechanical control circuit according to claim 1 or 2, wherein the wire slots are 54 wire slots, 60 wire slots, 66 wire slots or 72 wire slots.

4. The electromechanical control circuit according to claim 3, wherein the electromechanical stator has 6 poles.

5. The electromechanical control circuit according to claim 1 or 2, wherein the electromechanical stator has 8 poles and the wire slots are 72 wire slots.

6. In the DC boost charging mode, a first end of the three-phase inverter is electrically connected to the external power battery, a second end of the three-phase inverter is electrically connected to the external power module and the external power battery, midpoints of three-phase bridge arms of the three-phase inverter are respectively connected to corresponding ends of the three-phase windings of the three-phase AC electromechanical machine, and the other ends of the three-phase windings of the three-phase AC electromechanical machine are electrically connected to the external power module through a common connection point. The electromechanical control circuit according to claim 1 or 2.

7. The electromechanical control circuit according to claim 6, wherein in the DC boost charging mode, the common connection point of the three-phase windings of the three-phase AC electromechanical machine is electrically connected to the external power module, and as a result, no additional inductive element is provided between the common connection point and the external power module.

8. The electric machine control circuit according to claim 1 or 2, wherein the rated rotational speed of the three-phase AC electric machine is at least 17,000 revolutions per minute.

9. The electric machine control circuit according to claim 8, wherein the rated rotational speed of the three-phase AC electric machine is 20,000 revolutions per minute.

10. An electric drive assembly system comprising the electric machine control circuit according to any one of claims 1 to 9.

11. A vehicle comprising the electric drive assembly system according to claim 10.

Images