Patent ID: 12212216

It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various preferred features illustrative of the basic principles of the disclosure. The specific design features of embodiments of the present disclosure as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment.

In the figures, reference numbers refer to the same or equivalent sections of the present disclosure throughout the several figures of the drawing.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

Hereinafter, preferred exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

FIGS.1,2, and3are perspective diagrams illustrating a stator core of a motor cooling apparatus according to embodiments of the present disclosure, andFIGS.4and5are cross-sectional diagrams taken along lines A-A and B-B inFIG.2, respectively, in which reference numeral100in each drawing indicates a stator core.

The stator core100is one component of a motor, which is a traveling driving source for an electric vehicle or a hybrid electric vehicle, and provided in a structure of having multiple metal plates produced in a predetermined shape (e.g., a shape in which a stator coil may be wound) laminated thereon.

The stator core100is formed with an inlet channel10through which cooling fluid flows from one side portion thereof to an internal predetermined position.

Further, the stator core100is formed with a first cooling channel20and a second cooling channel30branched from an internal edge end of the inlet channel10to extend toward one side and the other side of the stator core100.

At this time, the inlet channel10is connected to a pump of a cooling fluid supply apparatus, and distal ends of the first cooling channel20and the second cooling channel30are connected to reservoirs of the cooling fluid supply apparatus.

Therefore, when the pump of the cooling fluid supply apparatus is driven, the cooling fluid is supplied to the inlet channel10, then cools the stator core while flowing into the first cooling channel20and the second cooling channel30, and then circulates to be recovered to the reservoir of the cooling fluid supply apparatus.

According to embodiments of the present disclosure, since an outer diameter portion of the stator core100is formed with a plurality of protrusions102at equal intervals in a circumferential direction thereof, the inlet channel10is formed on the protrusions102.

Preferably, the inlet channel10is formed on the protrusions102formed on the outer diameter portion of the stator core100from one side thereof toward the other side thereof at a predetermined depth.

In particular, since a first cooling fluid branch core110is laminated on a middle portion of the stator core100, the stator core100laminated and arranged on one side around the first cooling fluid branch core110is formed with the first cooling channel20, and the stator core100laminated and arranged on the other side therearound is formed with the second cooling channel30.

A plurality of first cooling channels20and a plurality of second cooling channels30are horizontally formed to penetrate the stator core100at equal intervals in the circumferential direction of the stator core100.

The first cooling fluid branch core110is provided in a structure in which a branch channel112configured to communicate between the internal edge portion of the inlet channel10of the protrusion102and the first cooling channel20and the second cooling channel30is formed.

More specifically, the branch channel112is configured to include a plurality of first are holes112-1formed to penetrate the outer circumferential portion of the first cooling fluid branch core110to communicate with the first cooling channel20and the second cooling channel30, and a first connection hole112-2formed to be communicable between the first are hole112-1and the inlet channel10of the protrusion102.

Therefore, the stator core100having the first cooling channel20formed on one side around the first cooling fluid branch core110is laminated, and the stator core100having the second cooling channel30formed on the other side therearound is laminated, and therefore, as illustrated inFIG.4, the first cooling channel20and the second cooling channel30are in a state of facing the first are hole112-1of the first cooling fluid branch core110and communicating with each other.

Further, a second cooling fluid branch core120formed with an outlet channel122, which communicates with the second cooling channel30, is laminated on the other side portion of the stator core100.

More specifically, the outlet channel122is configured to include a plurality of second are holes122-1formed to penetrate the second cooling fluid branch core120to communicate with the second cooling channel30, a discharge via hole122-3formed in the protrusion102of the second cooling fluid branch core120, and a second connection hole122-2formed to be communicable between the second are hole122-1and the discharge via hole122-3.

Therefore, the second cooling fluid branch core120is laminated on the outside of the stator core100laminated and arranged on the other side around the first cooling fluid branch core110, and therefore, as illustrated inFIG.4, the second cooling channel30of the stator core100and the second are hole122-1of the second cooling fluid branch core120are in a state of facing and communicating with each other.

Further, a cooling fluid discharge core130is laminated on the outside surface of the second cooling fluid branch core120.

More specifically, the cooling fluid discharge core130is provided in a structure of enclosing and covering the second are hole122-1and the second connection hole122-2of the second cooling fluid branch core120, and a structure of being formed with a discharge hole132communicating with the discharge via hole122-3.

At this time, the discharge hole132of the cooling fluid discharge core130is formed in the protrusion102of the cooling fluid discharge core130, and therefore, as illustrated inFIG.4, is in a state of matching with and communicating with the discharge via hole122-3formed in the protrusion102of the second cooling fluid branch core120.

Meanwhile, a bolting hole104configured to couple the stator core100using a bolt40is formed to penetrate the protrusion102.

In other words, the bolting hole104configured to be coupled with the stator core100with the bolt40is formed to penetrate the protrusion102, which is formed on each of the stator core100having the first cooling channel20, the first cooling fluid branch core110, the stator core100having the second cooling channel30, the second cooling fluid branch core120, and the cooling fluid discharge core130.

Therefore, as illustrated inFIG.5, by inserting and fastening the bolt40into the bolting hole104of the protrusion102, the stator core100having the first cooling channel20, the first cooling fluid branch core110, the stator core100having the second cooling channel30, the second cooling fluid branch core120, and the cooling fluid discharge core130are in a state of closely contacting each other and being coupled to one another.

FIGS.6and7are cross-sectional diagrams illustrating a state where a motor case and a motor case cover are mounted on the stator core of the motor cooling apparatus according to embodiments of the present disclosure.

As illustrated inFIGS.6and7, a motor case140configured to cover an outer circumferential portion of the stator core100is fastened to an outside surface of the cooling fluid discharge core130by the bolt40passing through the bolting hole104of the protrusion102, and a motor case cover150is coupled to the motor case140with the bolt.

Further, when the motor case140is fastened to the outside surface of the cooling fluid discharge core130with the bolt40, a nozzle cover50having a nozzle hole configured to return the cooling fluid passing through the discharge hole132to the reservoir of the cooling fluid supply device is fastened together between the cooling fluid discharge core130and the motor case140with the bolt40.

Therefore, the cooling fluid passing through the discharge hole132of the cooling fluid discharge core130via the second cooling channel30of the stator core100may be easily returned to the reservoir through the nozzle hole of the nozzle cover50.

Further, when the motor case cover150is coupled to the motor case140with the bolt, the motor case cover150is in a state of closely contacting and being arranged on one side portion of the stator core100having the first cooling channel20.

At this time, as illustrated inFIG.6, the motor case cover150is formed with a cooling fluid supply hole152connected to a discharge side of the pump of the cooling fluid supply apparatus to supply the cooling fluid to the inlet channel10of the protrusion102, and a cooling fluid discharge nozzle154configured to return the cooling fluid passing through a distal end of the first cooling channel20to the reservoir of the cooling fluid supply apparatus.

Therefore, by the driving of the pump of the cooling fluid supply apparatus, the cooling fluid may be easily supplied to the inlet channel10of the protrusion102through the cooling fluid supply hole152of the motor case cover150, and the cooling fluid discharged via the first cooling channel20of the stator core100may be easily returned to the reservoir through the cooling fluid discharge nozzle154.

Here, a cooling operation of the motor cooling apparatus according to embodiments of the present disclosure having the above configuration will be described as follows.

FIG.8is a cross-sectional diagram illustrating a state where the cooling fluid is circulated in the stator core of the motor cooling apparatus according to embodiments of the present disclosure.

First, the cooling fluid is supplied to the inlet channel10of the protrusion102through the cooling fluid supply hole152of the motor case cover150by driving the pump of the cooling fluid supply apparatus.

Subsequently, the cooling fluid supplied to the inlet channel10sequentially passes through the first connection hole112-2and the first are hole112-1of the branch channel112of the first cooling fluid branch core110.

Subsequently, from the first are hole112-1, the cooling fluid is branched to and flows into the first cooling channel20of the stator core100laminated on one side around the first cooling fluid branch core110and at the same time, is branched to and flows into the second cooling channel30of the stator core100laminated on the other side around the first cooling fluid branch core110, thereby cooling the stator core.

Next, the cooling fluid discharged from the first cooling channel20via the first cooling channel20of the stator core100is returned to the reservoir through the cooling fluid discharge nozzle154.

Further, the cooling fluid discharged from the second cooling channel30via the second cooling channel30of the stator core100sequentially passes through the second are hole122-1and the second connection hole122-2of the outlet channel122of the second cooling fluid branch core120, the discharge via hole122-3formed in the protrusion102of the second cooling fluid branch core120, and the discharge hole132of the cooling fluid discharge core130, and then is returned to the reservoir through the nozzle hole of the nozzle cover50.

As described above, the cooling fluid circulation flow path including the inlet channel10and the first and second cooling channels20,30horizontally branched from the inlet channel10may be formed in the stator core100of the motor such that the cooling fluid is supplied to the inlet channel10, and then branched to the left and right of the stator core100along the first and second cooling channels20,30to be circulated, thereby easily cooling the stator core, and eventually maximizing the cooling efficiency of the motor.