Electric motor and manufacturing method thereof

Abstract

Disclosed are an electric motor and a manufacturing method thereof. The electric motor comprises a case forming a receiving space therein; a stator received in the case; a rotor performing relative motion with respect to the stator; and a cooling path portion forming a path of a cooling fluid on an outer surface of the case, wherein the cooling path portion includes an outer rib projected toward the outer surface of the case and extended along a circumferential direction to form a receiving space of the cooling fluid therein; inner ribs projected from the outer surface of the case at an innerside of the outer rib, extended axially, and spaced apart from one another along a circumferential direction to form the path of the cooling fluid; and a cooling path cover arranged along a radius direction of the case to block the outsides of the outer rib and the inner rib to form the path of the cooling fluid together with the outer rib and the inner rib. In this case, a heat exchange area of the cooling fluid may be increased to raise cooling performance.

Description

technical field [0001] The invention relates to an electric motor and a manufacturing method thereof, in particular to an electric motor with improved power density through enhanced cooling and a manufacturing method thereof. Background technique [0002] As we all know, an electric motor is a device that converts electrical energy into kinetic energy by utilizing the strength of a current-carrying conductor received in a magnetic field. [0003] According to the type of power supply, electric motors are classified into DC motors and AC motors. [0004] Generally, an electric motor includes a stator and a rotor configured to allow relative movement with respect to the stator. [0005] The rotor is configured for rotational or linear reciprocation relative to the stator. [0006] An electric motor includes a housing in which a stator and a rotor can be accommodated. [0007] When the motor is driven, the temperature of the motor rises due to the heating action of the stato...

AI Technical Summary

Problems solved by technology

[0013] However, in the above-mentioned conventional electric motor, since the spiral path of the cooling fluid is formed around the casing, the heat exchange area between the cooling fluid and the casing is relatively small, and the improvement of the cooling performance is limited.

[0014] Therefore, there will be a problem that the temperature of the stator and / or the rotor will rise too high, so that the output (power density) will relatively deteriorate

[0015] Also, the cooling path is formed in such a way that the spiral tube is inserted into the casing to make the cooling water flow, and the wall thickness of the casing is thus thickened

As a result, the apparent size and weight of the casing increased significantly

[0016] Furthermore, it is difficult to manufacture the motor in such a manner that the helical tube is inserted into the case, thereby causing a problem of increased manufacturing cost

Images