Open winding motor for electric vehicle

Abstract

According to the open winding motor for the electric vehicle, multiple groups of multi-phase windings are adjacently arranged around a stator iron core, a phase head and a phase tail of each phase winding are respectively led out, the phase heads of the same phase in the multiple groups are connected in parallel, and the phase tails of the same phase in the multiple groups are connected in parallel, so that multiple phase head parallel lines and multiple phase tail parallel lines are formed in total; and the same group of rotor position sensors are matched with the driver, so that variable-frequency speed regulation control is realized, dynamic switching of winding connection modes is realized, and the performance of the motor can exert the maximum advantage in a complex use environment. Furthermore, the connection center points of the multi-phase windings are separated, so that the motor is in an open winding structure state, multiple phases work independently, interference between the windings is effectively avoided, and the reliability of the motor is greatly improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to an open-winding motor for an electric vehicle. Background Art

[0002] With the progress of society, the audience of convenient travel is gradually increasing, and electric vehicles have become one of the preferred means of transportation. At the same time, the requirements for the performance of electric vehicles are also getting higher and higher. At present, most electric vehicle motors are hub motors, and the windings inside the motors are mostly star-connected, delta-connected, and multi-winding connections; among them, for motors connected in star connection, under the same voltage input, the maximum output torque of the motor is inversely proportional to the speed; under the same torque, low-speed motors have small starting currents and large output torques; high-speed motors have large starting currents and small output torques; and the delta connection improves the motor output power compared to the star connection, and can provide higher speeds under the same torque. Compared with the star-connected motor, the disadvantage is that the starting current is large and the efficiency is low at low speeds; in summary, star motors and delta motors cannot have both speed and torque, and the electrical characteristics of conventional motors have been solidified and cannot break through the characteristic requirements of having higher torque and higher speeds. Under this background, it is necessary to make open-winding motor technology appear to adapt to the above requirements. Utility Model Content

[0003] In view of this, the purpose of the present application is to propose an open-winding motor for electric vehicles to solve some or all of the technical problems in the background technology.

[0004] Based on the above purpose, the present application provides an open-winding motor for an electric vehicle, comprising a stator core, wherein a plurality of winding posts are provided on the stator core, and winding slots are formed between adjacent winding posts;

[0005] The plurality of winding poles are wound with multiple groups of multi-phase windings arranged adjacent to each other in sequence, and the phase heads and phase tails of the same phase windings in the multiple groups are connected in parallel, thereby forming multiple phase head parallel lines and multiple phase tail parallel lines of the multi-phase windings respectively, wherein the multiple phase head parallel lines and the multiple phase tail parallel lines are independently arranged.

[0006] Optionally, the multi-phase winding includes a first phase winding, a second phase winding and a third phase winding which are arranged adjacent to each other.

[0007] Optionally, the plurality of phase-end parallel lines include a first phase-end parallel line, a second phase-end parallel line and a third phase-end parallel line.

[0008] Optionally, the plurality of phase-end parallel lines include a first phase-end parallel line, a second phase-end parallel line and a third phase-end parallel line.

[0009] Optionally, the first phase head parallel line, the second phase head parallel line and the third phase head parallel line are independently arranged in sequence from the outside to the inside, and the first phase tail parallel line, the second phase tail parallel line and the third phase tail parallel line are independently arranged in sequence from the outside to the inside, wherein the third phase tail parallel line is located outside the first phase head parallel line.

[0010] Optionally, the first phase-start parallel wire, the second phase-start parallel wire, the third phase-start parallel wire, the first phase-end parallel wire, the second phase-end parallel wire and the third phase-end parallel wire have the same wire diameter cross-section.

[0011] Optionally, the windings of the first phase winding, the second phase winding and the third phase winding are respectively wound around a group of winding poles, and the group of winding poles includes a first winding pole, a second winding pole and a third winding pole arranged in sequence.

[0012] Optionally, the phase heads of the first phase winding, the second phase winding and the third phase winding are respectively wound around the first winding pole, the third winding pole and the second winding pole from the winding groove between the first winding pole and the third winding pole of the adjacent group of winding poles, and the phase tails are wound out from the winding groove between the second winding pole and the third winding pole.

[0013] Optionally, the first winding pole is wound from bottom to top, and the second winding pole and the third winding pole are wound from top to bottom.

[0014] Optionally, the number of winding turns on several of the winding poles is the same.

[0015] From the above, it can be seen that the present application provides an open-winding motor for electric vehicles, in which multiple groups of multi-phase windings are arranged adjacent to each other around the stator core, and the phase heads and phase tails of each phase winding are led out separately, and the phase heads of the same phases in multiple groups are connected in parallel, and the phase tails of the same phases in multiple groups are connected in parallel, forming a total of multiple phase head parallel lines and multiple phase tail parallel lines. The same group of rotor position sensors is used in conjunction with the driver to achieve variable frequency speed control and dynamic switching of the winding connection method, which can maximize the performance of the motor in a complex usage environment. Furthermore, the connection center points of the multi-phase windings are separated, so that the motor presents an open winding structure state, and the multi-phases work independently, effectively avoiding interference between the windings, greatly improving the reliability of the motor itself, and at the same time, each winding works independently to achieve an increase in the winding terminal voltage, which can achieve a speed of about 1.7 times that of a star-connected motor (that is, the maximum star-connected winding terminal voltage is only half the speed of the DC bus voltage). It can also be combined with the weak magnetic speed-up method to achieve a speed of up to about 2 times that of a star-connected motor, which can greatly broaden the motor's speed range without increasing the DC bus voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the internal part of an open-winding motor for an electric vehicle according to an embodiment of the present application;

[0018] Figure 2 This is a theoretical schematic diagram of a three-phase winding triangle connection method in an embodiment of the present application;

[0019] Figure 3 This is a physical schematic diagram of the three-phase winding triangle connection method of the embodiment of the present application;

[0020] Figure 4 This is a theoretical schematic diagram of the three-phase winding star connection method of an embodiment of the present application;

[0021] Figure 5 This is a physical schematic diagram of the star connection of the three-phase windings according to an embodiment of the present application.

[0022] In the attached figure:

[0023] 1. stator core; 10. winding post; 101. winding slot; 11. first winding post; 12. second winding post; 13. third winding post; 14. Hall slot; AT, first phase parallel line; BT, second phase parallel line; CT, third phase parallel line; AW, first phase parallel line; BW, second phase parallel line; CW, third phase parallel line; A, first phase winding; B, second phase winding; C, third phase winding. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0025] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0027] Reference Figures 1 to 5 As shown, the utility model provides an open-winding motor for an electric vehicle, comprising a stator core 1, wherein the stator core 1 is provided with a plurality of winding posts 10, and winding slots 101 are formed between adjacent winding posts 10;

[0028] The plurality of winding poles 10 are wound with a plurality of groups of multi-phase windings arranged adjacent to each other in sequence, and the phase heads and phase tails of the same phase windings in the plurality of groups are connected in parallel, thereby forming a plurality of phase head parallel lines and a plurality of phase tail parallel lines of the multi-phase windings, respectively, wherein the plurality of phase head parallel lines and the plurality of phase tail parallel lines are independently arranged.

[0029] Specifically, multiple groups of multi-phase windings are arranged adjacent to each other around the stator core 1, and the phase head and phase tail of each phase winding are led out separately. The phase heads of the same phase in multiple groups are connected in parallel, and the phase tails of the same phase in multiple groups are connected in parallel, forming a total of multiple phase head parallel lines and multiple phase tail parallel lines. The same group of rotor position sensors is used in conjunction with the driver to achieve variable frequency speed control and dynamic switching of winding connection methods, which can maximize the performance of the motor in a complex use environment. The phase line and position sensor lead can be integrated in a wiring harness. Furthermore, the connection center points of the multi-phase windings are separated, so that the motor presents an open winding structure state, and the multi-phases work independently, effectively avoiding interference between the windings, greatly improving the reliability of the motor itself, and at the same time, each winding works independently to achieve an increase in the winding terminal voltage, which can achieve a speed of about 1.7 times that of a star-connected motor (that is, the maximum star-connected winding terminal voltage is only half the speed of the DC bus voltage). It can also be combined with the weak magnetic speed-up method to achieve a speed of up to about 2 times that of a star-connected motor, which can greatly broaden the motor's speed range without increasing the DC bus voltage.

[0030] In some embodiments, the multi-phase winding includes a first phase winding A, a second phase winding B, and a third phase winding C that are adjacently arranged. The plurality of phase head parallel lines include a first phase head parallel line AT, a second phase head parallel line BT, and a third phase head parallel line CT. The plurality of phase tail parallel lines include a first phase tail parallel line AW, a second phase tail parallel line BW, and a third phase tail parallel line CW.

[0031] Specifically, the plurality of winding poles 10 are wound with a plurality of groups of first phase windings A, second phase windings B and third phase windings C arranged adjacent to each other in sequence, and the phase heads and phase tails of the plurality of groups of the same phase windings are connected in parallel, thereby forming a first phase head parallel line AT and a first phase tail parallel line AW of the first phase winding A, a second phase head parallel line BT and a second phase tail parallel line BW of the second phase winding B, and a third phase head parallel line CT and a third phase tail parallel line CW of the third phase winding C. In this embodiment, the number of phases of the motor is three-phase, the number of winding lead wires is 2*3, and the same group of rotor position sensors is used in conjunction with the driver to realize variable frequency speed control and dynamic switching of the winding connection mode, so that the motor performance can be brought into full play in a complex use environment. The connection center points of the three-phase stator windings are separated, so that the motor presents an open winding structure state. The three phases work independently, effectively avoiding interference between the windings, greatly improving the reliability of the motor itself, and at the same time, each winding works independently to increase the winding terminal voltage, which can achieve about 1.7 times the speed of the star-connected motor (the maximum voltage of the star-connected winding terminal is only half of the DC bus voltage). Combined with the method of weak magnetic speed-up, the speed of the star-connected motor can be achieved at a maximum of about 2 times. Through this method, the speed range of the motor can be greatly widened without increasing the DC bus voltage.

[0032] In some embodiments, the first phase head parallel line AT, the second phase head parallel line BT and the third phase head parallel line CT are independently arranged in sequence from the outside to the inside, and the first phase tail parallel line AW, the second phase tail parallel line BW and the third phase tail parallel line CW are independently arranged in sequence from the outside to the inside, wherein the third phase tail parallel line CW is located outside the first phase head parallel line AT.

[0033] Specifically, Figure 1 As shown, the first phase head parallel line AT, the second phase head parallel line BT, the third phase head parallel line CT, the first phase tail parallel line AW, the second phase tail parallel line BW and the third phase tail parallel line CW are independently arranged from the outside to the inside, and the multi-phases work independently, effectively avoiding interference between the windings, greatly improving the reliability of the motor itself, and at the same time, each winding works independently to achieve an increase in the winding terminal voltage, which can achieve a speed of about 1.7 times that of the star-connected motor.

[0034] In some embodiments, Figures 2 to 5As shown in the figure, the motor winding can be connected in star or polygon (typically triangle) mode. The conversion of the connection form is completed by the driver. In star connection, the maximum speed of the motor is one factor higher than that in polygon connection. It can be seen that the open winding motor of this structure can not only meet the torque demand to the maximum extent, but also take into account the characteristics of high-speed output, effectively improving the adaptability of the motor to complex road conditions.

[0035] In some embodiments, the first phase start parallel wire AT, the second phase start parallel wire BT, the third phase start parallel wire CT, the first phase end parallel wire AW, the second phase end parallel wire BW and the third phase end parallel wire CW have the same wire diameter cross section.

[0036] Specifically, making the wire diameters of the parallel wires the same can better meet the current transmission requirements, and using the same set of rotor position sensors in conjunction with the driver to achieve variable frequency speed control.

[0037] In some embodiments, the windings of the first phase winding A, the second phase winding B and the third phase winding C are respectively wound around a group of winding poles 10, and the group of winding poles 10 includes a first winding pole 11, a second winding pole 12 and a third winding pole 13 arranged in sequence.

[0038] Furthermore, the phase heads of the first phase winding A, the second phase winding B and the third phase winding C are respectively wound around the first winding pole 11, the third winding pole 13 and the second winding pole 12 from the winding groove 101 between the first winding pole 11 and the third winding pole 13 of the adjacent group of winding poles 10, and the phase tails are wound out from the winding groove 101 between the second winding pole 12 and the third winding pole 13.

[0039] Specifically, Figure 1 As shown, the specific winding structure is equivalent to winding the first winding column and the third winding column first, and then winding the second winding column, and each adjacent grain and grass leads out a lead wire (that is, the lead wire connected to the parallel wire) after each winding slot 101, so as to facilitate the phase head and phase tail of each phase to be connected in parallel, so as to better realize the winding of the motor.

[0040] In some embodiments, the first winding pole 11 is wound from bottom to top, and the second winding pole 12 and the third winding pole 13 are wound from top to bottom.

[0041] Specifically, Figure 1 As shown, the phase head of each phase is wound upward from the root of the first winding pole 11, and then wound from the top to the third winding pole 13, so that the third winding pole 13 is wound from top to bottom, and then the second winding pole 12 is also wound from top to bottom, so that the lead wire is led out from the bottom, which is more convenient to connect with the parallel line. And it can also save the length of the connecting wire.

[0042] Furthermore, the number of winding turns on the plurality of winding poles 10 is the same.

[0043] Furthermore, some of the winding posts 10 are provided with a Hall slot 14, and the Hall slot 14 is a mounting hole that is compatible with the shape and size of the inverted middle Hall element. The utility model is aimed at a motor with a commutation angle of 60 degrees, and designs the middle Hall slot 14 of the motor to be a mounting hole structure that can just match the shape and size of the inverted middle Hall element, thereby improving the success rate of Hall installation and avoiding damage caused by loosening or collision of the Hall during riding.

[0044] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0045] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0046] Although the present invention has been described in conjunction with specific embodiments of the present invention, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art based on the foregoing description.For example, other memory architectures may use the discussed embodiments.

[0047] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. An open-winding motor for an electric vehicle, comprising a stator core (1), wherein the stator core (1) is provided with a plurality of winding posts (10), and winding slots (101) are formed between adjacent winding posts (10); characterized in that: The plurality of winding poles (10) are wound with a plurality of groups of multi-phase windings arranged adjacent to each other in sequence, the phase heads of the same phase windings in the plurality of groups are connected in parallel and the phase tails are connected in parallel, thereby forming a plurality of phase head parallel lines and a plurality of phase tail parallel lines of the multi-phase winding respectively, wherein the plurality of phase head parallel lines and the plurality of phase tail parallel lines are independently arranged.

2. An open winding motor for electric vehicles according to claim 1, characterized in that: The multi-phase winding includes a first phase winding (A), a second phase winding (B) and a third phase winding (C) which are arranged adjacent to each other.

3. An open winding motor for electric vehicles according to claim 2, characterized in that: The plurality of phase parallel lines include a first phase parallel line (AT), a second phase parallel line (BT) and a third phase parallel line (CT).

4. The open winding motor for electric vehicle according to claim 3, characterized in that: The plurality of phase-end parallel lines include a first phase-end parallel line (AW), a second phase-end parallel line (BW), and a third phase-end parallel line (CW).

5. The open winding motor for electric vehicle according to claim 4, characterized in that: The first phase head parallel line (AT), the second phase head parallel line (BT) and the third phase head parallel line (CT) are independently arranged in sequence from the outside to the inside, and the first phase tail parallel line (AW), the second phase tail parallel line (BW) and the third phase tail parallel line (CW) are independently arranged in sequence from the outside to the inside, wherein the third phase tail parallel line (CW) is located outside the first phase head parallel line (AT).

6. The open-winding motor for electric vehicles according to claim 5, characterized in that: The first phase head parallel wire (AT), the second phase head parallel wire (BT), the third phase head parallel wire (CT), the first phase tail parallel wire (AW), the second phase tail parallel wire (BW) and the third phase tail parallel wire (CW) have the same wire diameter cross section.

7. An open-winding motor for electric vehicles according to claim 2, characterized in that: The windings of the first phase winding (A), the second phase winding (B) and the third phase winding (C) are respectively wound around a group of winding poles (10), and the group of winding poles (10) comprises a first winding pole (11), a second winding pole (12) and a third winding pole (13) arranged in sequence.

8. The open-winding motor for electric vehicles according to claim 7, characterized in that: The phase heads of the first phase winding (A), the second phase winding (B) and the third phase winding (C) are respectively wound from the winding groove (101) between the first winding pole (11) and the third winding pole (13) of the adjacent group of winding poles (10) around the first winding pole (11), the third winding pole (13) and the second winding pole (12) in sequence, and the phase tails are wound out from the winding groove (101) between the second winding pole (12) and the third winding pole (13).

9. An open-winding motor for electric vehicles according to claim 8, characterized in that: The first winding pole (11) is wound from bottom to top, and the second winding pole (12) and the third winding pole (13) are wound from top to bottom.

10. The open-winding motor for electric vehicles according to claim 1, characterized in that: The number of winding turns on a plurality of winding poles (10) is the same.

Images