CN218071229U - Step type combined motor - Google Patents

Abstract

The utility model provides a step type combined motor, which comprises a first motor and a second motor, wherein the first motor and the second motor share a shell and a motor shaft; the first motor is internally provided with a first motor stator assembly, the second motor is internally provided with a second motor stator assembly, the outer diameters of the first motor stator assembly and the second motor stator assembly are different, and the second motor stator assembly and the first motor stator assembly are partially overlapped along the radial direction. The utility model discloses effectively reduce combined motor's axial length and weight, improved material utilization rate, reduce manufacturing cost.

Description

Step type combined motor

Technical Field

The utility model relates to the technical field of electric machines, especially, relate to a cascaded combination motor.

Background

The driving motor for the vehicle is a key part of a power system of the electric vehicle, and the quality of the performance of the driving motor directly influences the performance of the whole vehicle of the vehicle. The performance of the current electric automobile is greatly improved, so that a motor with high power and high torque is required.

In the process of implementing the present invention, the inventor finds that there are at least the following problems in the prior art: the efficiency of the large-torque and high-power single motor in a low-speed and low-load region is poor, and the efficiency of a driving system is low when a vehicle runs at a constant speed or runs in an idle state.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent.

Therefore, the utility model aims to provide an improve cascaded combination motor of low district's efficiency of turning round.

In order to achieve the above object, the present invention provides a step type combined motor, which comprises a first motor and a second motor, wherein the first motor and the second motor share a housing and a motor shaft; the first motor is internally provided with a first motor stator assembly, the second motor is internally provided with a second motor stator assembly, the outer diameters of the first motor stator assembly and the second motor stator assembly are different, and the second motor stator assembly and the first motor stator assembly are partially overlapped along the radial direction.

According to the utility model discloses cascaded combination motor through setting up the motor stator assembly of big or small inequality, the output of two motors, moment of torsion are different, realize the motor coupling of two different powers and moment of torsion from this, and the motor after the combination can realize different motor efficiency curved combination and high efficiency district setting. The utility model discloses cascaded combination motor, second motor stator assembly and first motor stator assembly overlap along radial part, effectively reduce combination motor's axial length and weight, have improved material utilization, reduce manufacturing cost.

According to an embodiment of the present invention, the first motor stator assembly includes a first core and a first coil, the first coil being wound around the first core; the second motor stator assembly comprises a second iron core and a second coil, and the second coil is wound on the second iron core; one end of the first coil close to the second motor is radially overlapped with one end of the second coil close to the first motor.

According to the utility model discloses an embodiment, still include flange and output shaft, the output shaft with the one end body coupling of motor shaft, the flange with the other end of motor shaft is connected.

According to the utility model discloses an embodiment, still include first end cover, second end cover, first bearing, second bearing and bearing seal, first end cover with the second end cover is installed respectively the both ends of casing, first bearing is installed on the first end cover, the second bearing is installed on the second end cover, the motor shaft is fixed first bearing with on the second bearing, the bearing seal is installed first end cover with in the space between the motor shaft.

According to the utility model discloses an embodiment, first motor includes first electric motor rotor assembly, the second motor includes second electric motor rotor assembly, first electric motor rotor assembly with second electric motor rotor assembly installs on the motor shaft, the second coil with first electric motor rotor assembly sets up relatively and leaves the clearance.

According to the utility model discloses an embodiment, the inner wall of casing is equipped with and keeps off the shoulder, first iron core with one side of second iron core with keep off the shoulder and support and lean on, the opposite side is by the briquetting fastening.

According to the utility model discloses an embodiment, the casing has the step face, first coil with the inner wall of step face sets up relatively, the second coil arrives first electric motor rotor assembly's distance is less than the inner wall of step face arrives the distance of first electric motor rotor assembly.

According to the utility model discloses an embodiment still includes cooling device, cooling device's coolant liquid includes at least one of following: water and oil.

According to the utility model discloses an embodiment still includes first controller and second controller, first controller with first motor stator assembly electricity is connected, the second controller with second motor stator assembly electricity is connected.

According to an embodiment of the invention, the type of the first and second electric machines comprises at least one of: induction asynchronous motor, permanent magnet synchronous motor.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. Wherein:

fig. 1 is a schematic cross-sectional view of a stepped combined motor according to an embodiment of the present invention.

Fig. 2 is a logic block diagram of a stepped combined motor according to an embodiment of the present invention.

Description of the reference numerals:

1-shell, 2-first motor stator assembly, 3-first motor rotor assembly, 4-first end cover, 5-flange, 6-output shaft, 7-shaft seal, 8-first bearing, 9-second motor stator assembly, 10-second motor rotor assembly, 11-second bearing, 12-second end cover, 13-pressing block, 14-blocking shoulder, 15-first iron core, 16-first coil, 17-step surface, 18-second iron core and 19-second coil.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.

Fig. 1 is a schematic cross-sectional view of a stepped combined motor according to an embodiment of the present invention.

Referring to fig. 1, a step type combined motor comprises a first motor and a second motor, wherein the first motor and the second motor share a shell 1 and a motor shaft; the first motor is internally provided with a first motor stator assembly 2, the second motor is internally provided with a second motor stator assembly 9, the first motor stator assembly 2 and the second motor stator assembly 9 have different outer diameters, and the second motor stator assembly 9 and the first motor stator assembly 2 are partially overlapped along the radial direction.

The difference between the outer diameters of the first motor stator assembly 2 and the second motor stator assembly 9 can be understood as that the outer diameter of the first motor stator assembly 2 is larger than the outer diameter of the second motor stator assembly 9, or that the outer diameter of the first motor stator assembly 2 is smaller than the outer diameter of the second motor stator assembly 9. For example, the SD400 motor is combined with the SD290 motor, and the SD365 motor is combined with the SD220 motor, wherein the numbers represent the outer diameter of the motor stator assembly. Generally, the outer diameters of the stator assemblies of the motors are different, and the power characteristics of the motors are also different. The second motor stator assembly 9 partially overlaps the first motor stator assembly 2 along the radial direction, which may be understood as a portion of the second motor stator assembly 9 extending into the inner wall of the first motor stator assembly 2, and may also be understood as a portion of the first motor stator assembly 2 extending into the inner wall of the second motor stator assembly 9.

According to the utility model discloses cascaded combination motor through setting up the motor stator assembly of big or small inequality, the output of two motors, moment of torsion are different, realize the motor coupling of two different powers and moment of torsion from this, and the motor after the combination can realize different motor efficiency curved combination and high efficiency district setting. The utility model discloses cascaded combination motor, second motor stator assembly and first motor stator assembly overlap along radial part, effectively reduce combination motor's axial length and weight, have improved material utilization, reduce manufacturing cost.

In some embodiments, referring to fig. 1, the first electric machine stator assembly 2 includes a first core 15 and a first coil 16, the first coil 16 being wound on the first core 15; the second motor stator assembly 9 comprises a second iron core 18 and a second coil 19, and the second coil 19 is wound on the second iron core 18; the end of the first coil 16 close to the second motor radially overlaps the end of the second coil 19 close to the first motor. Therefore, the axial length and the weight of the combined motor can be effectively reduced, and the material utilization rate is improved. The manner in which the coil is wound around the core is various and is not particularly limited.

The first motor comprises a first motor rotor assembly 3, the second motor comprises a second motor rotor assembly 10, and both the first motor rotor assembly 3 and the second motor rotor assembly 10 are mounted on a motor shaft. The first motor rotor assembly 3 and the second motor rotor assembly 10 rotate synchronously with the motor shaft. The second coil 19 is disposed opposite the first motor rotor assembly 3 with a gap, where a reasonable electrical gap is left to prevent short circuit.

In some embodiments, referring to fig. 1, the housing 1 has a step surface 17, the first coil 16 is disposed opposite to an inner wall of the step surface 17, and the distance from the second coil 19 to the first electric motor rotor assembly 3 is smaller than the distance from the inner wall of the step surface 17 to the first electric motor rotor assembly 3. The distance between the two ends of the coils (16, 19) in the axial direction is larger than the length of the corresponding motor rotor assemblies (3, 10), so that when the outer diameters of the first motor stator assembly 2 and the second motor stator assembly 9 have size difference, the motor stator assembly with larger outer diameter can be arranged at the outer position, which is radially outward, of the motor stator assembly with smaller outer diameter.

In some embodiments, the step type combined motor further comprises a flange 5 and an output shaft 6, wherein the output shaft 6 is integrally connected with one end of the motor shaft, and the flange 5 is connected with the other end of the motor shaft. The flange 5 can be connected to a desired rotating device.

In some embodiments, the step type combined motor further comprises a first end cover 4, a second end cover 12, a first bearing 8, a second bearing 11 and a shaft seal 7, wherein the first end cover 4 and the second end cover 12 are respectively installed at two ends of the shell 1, the first bearing 8 is installed on the first end cover 4, and the second bearing 11 is installed on the second end cover 12. Specifically, referring to fig. 1, the inner walls of the first end cap 4 and the second end cap 12 have annular fixing seats arranged along the axial direction, and the bearings can be clamped in the fixing seats. The motor shaft is fixed to the first bearing 8 and the second bearing 11. A shaft seal 7, which is a friction seal or stuffing box, is installed in the space between the first end cap 4 and the motor shaft and is a sealing device provided to prevent leakage between the motor shaft and the housing.

In some specific examples, the inner wall of the housing 1 is provided with a shoulder 14, one side of the first iron core 15 and the second iron core 18 abuts against the shoulder 14, and the other side is fastened by the pressing block 13. During installation, the iron cores (15, 18) are pressed in from two sides of the shell body 1 respectively, and after the iron cores are abutted against the retaining shoulders 14, the pressing blocks 13 are pressed in to fix the iron cores.

It should be noted that the step type combined motor further includes a cooling device, and the cooling liquid of the cooling device may be cooling water, cooling liquid, or cooling water for the cooling device of one of the motors and cooling oil for the cooling device of the other motor.

It is understood that the type of the first motor and the second motor in the step type combined motor includes at least one of: induction asynchronous motor, permanent magnet synchronous motor. The first and second motors may be of the same or different types.

In some specific examples, referring to fig. 2, the step motor further comprises a first controller electrically connected to the first motor stator assembly 2 and a second controller electrically connected to the second motor stator assembly 9. The first and second controllers control the speed of rotation of the first and second electric motor rotor assemblies 3 and 10 by controlling the current in the first and second electric motor stator assemblies 2 and 9. The first motor rotor assembly 3 and the second motor rotor assembly 10 drive the motor shaft to rotate together and output torque. The first motor rotor assembly 3 and the second motor rotor assembly 10 are controlled to form different rotating speeds through the first controller and the second controller, namely, the first motor rotor assembly 3 and the second motor rotor assembly 10 bear different torques. The controller can use a conventional controller module, can fit the motor efficiency area, and gives consideration to high torque and high power and simultaneously highlights the high efficiency of the combined motor. I.e. the first motor efficiency and the second motor efficiency are combined differently for different loads, resulting in a higher overall efficiency. For example, a first motor is used to output 30% of the torque and a second motor is used to output 70% of the torque. Assuming that the two motors are identical, the overall efficiency is lower at 10% load, whereas using the combined motor of the present example, under the same requirements, the motor load ratio is higher with a smaller outer diameter of the stator assembly due to the motor characteristics of each individual, and the efficiency in the low-torque region can be improved, resulting in higher overall efficiency. The motor with the smaller outer diameter of the stator assembly can reduce cost, improve efficiency of a low-torque area, has lower peak torque and better peak power, and can improve power characteristics and efficiency characteristics of a high-speed area. The motor with the larger outer diameter of the stator assembly can improve the medium-load efficiency characteristic, and improve the low-speed high-load power characteristic and the efficiency characteristic.

Because two motors are adopted, when any one motor breaks down, the rest motors can still continue to work. Therefore, the reliability and the safety of the stepped combined motor are improved.

In a further embodiment, the number of motors may be multiple, i.e. the first and second motors each have a number of at least 1, the diameter of each motor being different. The motors still share one motor shaft and one shell to form the cascade combined motor. The operation principle is completely the same as the above embodiments, and will not be described herein.

To sum up, the cascaded combination motor of above-mentioned embodiment's beneficial effect is: the motors with different diameters are combined, so that the coupling of different powers and torques can be realized more easily; the requirements of different motor efficiency combinations of different diameter motor combinations are met. In addition, the coil end parts of the motor stator assembly are arranged in an overlapped mode through the step arrangement, so that the axial length can be reduced, and the weight can be reduced.

It should be noted that, in the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present invention includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. A stepped combined motor comprises a first motor and a second motor, wherein the first motor and the second motor share a shell (1) and a motor shaft; the first motor is internally provided with a first motor stator assembly (2), the second motor is internally provided with a second motor stator assembly (9), the first motor stator assembly (2) and the second motor stator assembly (9) are different in outer diameter, and the second motor stator assembly (9) is partially overlapped with the first motor stator assembly (2) along the radial direction.

2. Stepped combined electrical machine according to claim 1, characterised in that the first electrical machine stator assembly (2) comprises a first core (15) and a first coil (16), the first coil (16) being wound on the first core (15); the second motor stator assembly (9) comprises a second iron core (18) and a second coil (19), and the second coil (19) is wound on the second iron core (18); one end of the first coil (16) close to the second electrical machine radially overlaps one end of the second coil (19) close to the first electrical machine.

3. The stepped combination motor of claim 1, further comprising a flange (5) and an output shaft (6), said output shaft (6) being integrally connected to one end of said motor shaft, said flange (5) being connected to the other end of said motor shaft.

4. The stepped combination motor according to claim 1, further comprising a first end cap (4), a second end cap (12), a first bearing (8), a second bearing (11) and a shaft seal (7), wherein the first end cap (4) and the second end cap (12) are respectively mounted at two ends of the housing (1), the first bearing (8) is mounted on the first end cap (4), the second bearing (11) is mounted on the second end cap (12), the motor shaft is fixed on the first bearing (8) and the second bearing (11), and the shaft seal (7) is mounted in a space between the first end cap (4) and the motor shaft.

5. The step motor according to claim 2, characterized in that said first motor comprises a first motor rotor assembly (3) and said second motor comprises a second motor rotor assembly (10), said first motor rotor assembly (3) and said second motor rotor assembly (10) being mounted on said motor shaft, said second coil (19) being arranged opposite said first motor rotor assembly (3) with a gap.

6. The stepped combined motor according to claim 2, wherein a shoulder (14) is provided on an inner wall of the housing (1), one side of the first core (15) and the second core (18) abuts against the shoulder (14), and the other side is fastened by a pressing block (13).

7. The step motor according to claim 5, wherein said housing (1) has a step surface (17), said first coil (16) is disposed opposite to an inner wall of said step surface (17), and a distance from said second coil (19) to said first motor rotor assembly (3) is smaller than a distance from an inner wall of said step surface (17) to said first motor rotor assembly (3).

8. The stepped compound motor of claim 1, further comprising a cooling device, a cooling fluid of the cooling device comprising at least one of: water and oil.

9. The stepped combination motor of claim 1, further comprising a first controller electrically connected to the first motor stator assembly (2) and a second controller electrically connected to the second motor stator assembly (9).

10. The stepped combination motor of any one of claims 1-9, wherein the type of the first motor and the second motor comprises at least one of: induction asynchronous motor, permanent magnet synchronous motor.

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