WO2021091158A1

WO2021091158A1 - Cooling structure for rotor of drive motor

Info

Publication number: WO2021091158A1
Application number: PCT/KR2020/014862
Authority: WO
Inventors: 류영현
Original assignee: 송과모터스 주식회사
Priority date: 2019-11-06
Filing date: 2020-10-29
Publication date: 2021-05-14
Also published as: CN114631248A; CN114631248B; KR102238301B1

Abstract

The present invention relates to a cooling structure for a rotor of a drive motor, the cooling structure having an improved assembling property because the cooling structure can be installed on a rotary shaft and a coolant cover through relatively easy and simple processes while a cooling fluid supply pipe only requires an assembling process using a coupling means such as a bolt, etc. by forming the cooling fluid supply pipe of an integrated type that can be installed throughout the inside and outside of a hollow type rotary shaft of the drive motor and installing same throughout inside the rotary shaft and outside of the coolant cover. The cooling structure for the rotor of the drive motor according to the present invention, the rotor of the drive motor including a hollow type rotary shaft and a rotor core coupled to the rotary shaft, comprises: a coolant cover having a through hole for communicating with the inside of the rotary shaft and being coupled to the rotary shaft in a state in which the through hole is connected to the inside of the rotary shaft; the cooling fluid supply pipe having an integrated tubular structure installed throughout the inside of the rotary shaft and the outside of the coolant cover via the through hole, and discharging a cooling fluid supplied from an end at the outside of the coolant cover into the rotary shaft via an opposite end in the rotary shaft; and a coupling means for coupling the cooling fluid supply pipe to the coolant cover.

Description

Rotor cooling structure of drive motor

The present invention forms an integral cooling fluid supply pipe in a form that can be installed across the inside and outside of the hollow rotary shaft of the drive motor and installs it inside the rotary shaft and outside the coolant cover, so that the cooling fluid supply pipe uses fastening means such as bolts. The present invention relates to a rotor cooling structure of a driving motor that requires only an assembly process and can be installed on a rotating shaft and a coolant cover through a relatively easy and simple process, thereby improving assembly performance.

Electric vehicles, generally referred to as eco-friendly vehicles, generate driving power by a driving motor that obtains rotational power through electric energy.

As such, a permanent magnet synchronous motor (PMSM) is widely used as a driving motor used as a power source for an eco-friendly vehicle such as an electric vehicle or a hybrid vehicle.

Permanent magnet type synchronous motors need to maximize the performance of permanent magnets in order to achieve maximum performance under constrained layout conditions. Neodymium (Nd) components in permanent magnets improve the strength of permanent magnets, and dysprosium (Dy) Ingredients improve high temperature demagnetization resistance.

However, rare earth (Nd, Dy) metal components of these permanent magnets are limitedly buried in some countries such as China, are very expensive, and fluctuate in price.

For this reason, in recent years, development of a field winding synchronous motor (WRSM) that can replace a permanent magnet type synchronous motor (PMSM) as a driving motor used as a power source of an eco-friendly vehicle is in progress.

The field winding type synchronous motor replaces the permanent magnet of the permanent magnet type synchronous motor (PMSM) by winding a coil to the rotor as well as the stator to electromagnetize the rotor when current is applied.

In such a field winding type synchronous motor, the rotor is arranged with a certain gap inside the stator, and when power is applied to the stator and the coil of the rotor, a magnetic field is formed, and the rotation of the rotor is prevented by the magnetic action generated between them. Done.

On the other hand, driving motors such as the above-described permanent magnet type synchronous motor or field winding type synchronous motor generate high-temperature heat around the rotor and coils while rotating at high speed.

In addition, due to the heat generated in the rotor and coil as described above, the efficiency of the driving motor may decrease due to power loss and damage to internal parts may occur. Therefore, various types of cooling technologies have been researched and proposed as a technology to prevent this. have.

Referring to FIG. 1, FIG. 1 is a configuration diagram illustrating a rotor cooling structure of an existing drive motor, and the rotation shaft 11 of the rotor 10 has a hollow structure in which one end in the longitudinal direction is closed. This is a method of providing a cooling function to the rotor 10 by installing a coolant tube (20) deep inside the interior of (11).

However, in the case of the rotor cooling structure of such an existing drive motor, the outer diameter of the supply pipe 20 and the inner diameter of the coolant cover 30 are adjusted to press-fit the supply pipe 20 of the cooling fluid into the coolant cover 30. At the same time, a process of hot/cold press-fitting of the precisely processed supply pipe 20 into the coolant cover 30 was required. In addition, a separate inlet pipe (40: inlet pipe) was required.

To further explain, the rotor cooling structure of the existing drive motor is a structure for installing the cooling fluid supply pipe 20 and the installation process thereof is relatively complicated and cumbersome.

In an embodiment of the present invention, an integral cooling fluid supply pipe is formed in a form that can be installed across the inside and outside of the hollow rotary shaft of the drive motor, and the cooling fluid supply pipe is fastened with bolts, etc. by installing it inside the rotary shaft and outside the coolant cover. It provides a rotor cooling structure of a driving motor that requires only an assembly process using means and can be installed on a rotating shaft and a coolant cover through a relatively easy and simple process, thereby improving assembly performance.

In the rotor cooling structure of the drive motor according to an embodiment of the present invention, as a rotor of the drive motor, in the cooling structure of a rotor including a hollow rotary shaft and a rotor core coupled to the rotary shaft, A through hole for communicating with the inside is formed to connect the through hole to the inside of the rotation shaft, and a coolant cover coupled to the rotation shaft, through the through hole, across the inside of the rotation shaft and the outside of the coolant cover. A connection for fastening the cooling fluid supply pipe and the cooling fluid supply pipe to the coolant cover, and a cooling fluid supply pipe that discharges the cooling fluid supplied from one end outside the coolant cover into the rotation shaft through the other end inside the rotation shaft. Means may be included.

In addition, the cooling fluid supply pipe includes a first conduit extending from an inlet of the through hole to a predetermined position in the rotation shaft, a second conduit extending in a round shape from one end of the first conduit toward the inlet of the through-hole, and the second conduit It may have a shape including a third conduit extending in a direction perpendicular to the first conduit from one end of.

In addition, in the cooling fluid supply pipe, a predetermined portion of a single pipe is bent to form the second pipe, and at the same time, both sides form the first pipe and the second pipe around the bent second pipe. A predetermined portion of is bent to form the first pipe and the second pipe, and the third pipe may be coupled to one end of the bent second pipe.

According to an embodiment of the present invention, a cooling fluid supply pipe in a form that can be installed across the inside and outside of the hollow rotary shaft of the drive motor is installed across the inside of the rotation shaft and outside of the coolant cover while only requiring an assembly process using fastening means such as bolts. As a result, the installation of the cooling structure for the rotor of the drive motor is made through a relatively easy and simple process, and assembling property can be remarkably improved.

1 is a configuration diagram illustrating a rotor cooling structure of an existing drive motor

2 is a block diagram illustrating a rotor cooling structure of a drive motor according to an embodiment of the present invention

The following detailed descriptions of the present invention are embodiments in which the present invention may be practiced and refer to the accompanying drawings, which are illustrated as examples of the embodiments. These embodiments will be described in detail sufficient for those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different from each other, but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention in relation to one embodiment. In addition, it should be understood that the location or arrangement of individual components in each described embodiment may be changed without departing from the spirit and scope of the present invention.

Accordingly, the detailed description to be described below is not intended to be taken in a limiting sense, and the scope of the present invention is limited only by the appended claims, along with all scopes equivalent to those claimed by the claims, if appropriately described. Like reference numerals in the drawings refer to the same or similar functions over several aspects.

The terms used in the present invention have been selected from general terms that are currently widely used while considering functions in the present invention, but this may vary according to the intention or precedent of a technician working in the field, the emergence of new technologies, and the like. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meaning of the terms will be described in detail in the description of the corresponding invention. Therefore, the terms used in the present invention should be defined based on the meaning of the term and the overall contents of the present invention, not a simple name of the term.

In the present invention, when a part "includes" a certain component in the whole, it means that other components may be further included rather than excluding other components unless otherwise stated. In addition, “… Wealth”, 　＂… The term “module” refers to a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software.

A rotor cooling structure of a drive motor according to an embodiment of the present invention will be described with reference to FIG. 2.

2 is a block diagram illustrating a rotor cooling structure of a drive motor according to an embodiment of the present invention.

As shown, the rotor cooling structure of the driving motor according to an embodiment of the present invention includes a coolant cover 200, a cooling fluid supply pipe 300, and a fastening means 400.

That is, the rotor 100 is a rotor of a driving motor, and the rotor 100 includes a hollow rotary shaft 110 and a rotor core (not shown) coupled to the rotary shaft 110, The cooling structure of this embodiment is a configuration for the rotor 100 of such a drive motor. In addition, in the present embodiment, it is exemplified that the rotary shaft 110 has a hollow structure in which one end in the longitudinal direction is closed, but the present invention is not limited thereto.

The coolant cover 200 has a through hole 210 for communicating with the inside of the rotation shaft 110, and is coupled to the rotation shaft 110 in a state that connects the through hole 210 with the inside of the rotation shaft 110. .

The cooling fluid supply pipe 300 is an integrated pipe structure installed over the inside of the rotation shaft 110 and the outside of the coolant cover 200 through the through hole 210 of the coolant cover 100, and such a cooling fluid supply pipe 300 serves to discharge the cooling fluid supplied from one end of the outer side of the coolant cover 100 into the rotation shaft 110 through the other end of the rotation shaft 110. In the drawing, the supply of the cooling fluid to the inside of the rotation shaft 110 and a moving path in which the cooling fluid supplied into the rotation shaft 110 is recovered to the outside of the rotation shaft 110 together with a cooling action are illustrated by arrows.

In addition, the cooling fluid supply pipe 300 includes a first pipe 310 extending from an entrance of the through hole 210 of the coolant cover 200 to a predetermined position in the rotation shaft 110, and a through hole 110 of the first pipe 310. ) A form including a second conduit 320 extending in a round shape from one end of the inlet and a third conduit 330 extending in a direction perpendicular to the first conduit 310 from one end of the second conduit 320 Can be

In addition, the cooling fluid supply pipe 300 is formed by bending a predetermined portion of a single pipe to form the second pipe line 320, and at the same time, the first pipe line 310 and the second pipe were bent at both sides of the second pipe line 320. It may be in the form of forming a pipe (320).

In addition, as a different form, in the cooling fluid supply pipe 300, a predetermined portion of the pipe is bent to form the first pipe 310 and the second pipe 320, and the first pipe line 310 and the second pipe line 320 are formed at one end of the bent second pipe line 320. 3 The conduit 330 may be coupled through a method such as welding.

The fastening means 400 functions to fasten the cooling fluid supply pipe 300 to the coolant cover 200, and these fastening means may be implemented in various forms through known techniques such as a configuration using bolts, Therefore, in the present embodiment, a detailed description and illustration thereof have been omitted and briefly illustrated.

Further, reference numeral 500, which is not described, exemplifies a sealing member for preventing leakage of the cooling fluid flowing into the coolant cover 200 for recovery after the cooling action in the rotation shaft 110.

By the above-described configuration, an integral cooling fluid supply pipe 300 is formed in a form that can be installed across the inside and outside of the hollow rotary shaft 110, and it is spread over the inside of the rotary shaft 110 and the outside of the coolant cover 200. By installation, the cooling fluid supply pipe 300 can be installed through a relatively easy and simple process on the rotating shaft 110 and the coolant cover 200 while only requiring an assembly process using fastening means such as bolts.

In other words, the installation configuration of the cooling structure for the rotor 100 of the driving motor is simplified, and through this, the installation work for the rotor 100 of the cooling structure can be easily proceeded.

To further explain, according to this embodiment, as in the rotor cooling structure of the existing drive motor, cold/hot press-in is required to insert one end of the supply pipe of the cooling fluid in close contact with the coolant cover. The process of precisely processing the inner diameter of the runt cover may be omitted.

In addition, a process of coupling a separate inlet pipe to the coolant cover while being connected to one end of the supply pipe may be omitted to supply the cooling fluid to one end of the supply pipe of the cooling fluid.

As described above, in the present description, specific matters such as specific components, etc., and limited embodiments and drawings have been described, but this is provided only to help a more general understanding of the present invention, and the present invention is limited to the above embodiments. No, various modifications and variations are possible from these descriptions by those of ordinary skill in the field to which the present invention belongs.

Therefore, the spirit of the present invention is limited to the described embodiments and should not be written, and all things having equivalent or equivalent modifications to the claims as well as the claims to be described later belong to the scope of the inventive concept.

Claims

In the cooling structure of the rotor comprising a rotor of the drive motor, a hollow rotary shaft and a rotor core coupled to the rotary shaft,

A coolant cover coupled to the rotation shaft in a state in which a through hole for communicating with the inside of the rotation shaft is formed to connect the through hole to the inside of the rotation shaft;

It is an integral tubular structure installed over the inside of the rotation shaft and the outside of the coolant cover through the through hole, and discharges the cooling fluid supplied from one end outside the coolant cover into the rotation shaft through the other end inside the rotation shaft. Cooling fluid supply pipe; And

Rotor cooling structure of a drive motor comprising a fastening means for fastening the cooling fluid supply pipe to the coolant cover.
The method of claim 1,

The cooling fluid supply pipe includes a first pipe extending from an inlet of the through hole to a predetermined position in the rotation shaft, a second pipe extending in a round shape from one end of the first pipe at an inlet of the through hole, and one end of the second pipe And a third conduit extending in a direction perpendicular to the first conduit.
The method of claim 2,

In the cooling fluid supply pipe, a predetermined portion of a single pipe is bent to form the second pipe, and at the same time, both sides of the bent second pipe form the first pipe and the second pipe. A rotor cooling structure of a driving motor, characterized in that a portion is bent to form the first and second pipes, and the third pipe is coupled to one end of the bent second pipe.