An end cap for an electric motor, comprising an insulating body, the insulating body being cylindrical and defining an axial direction, a brush assembly mounted to one axial side of the insulating body, a pair of power terminals fixed by the insulating body, and a filter circuit board mounted to the other axial side of the insulating body; wherein each power terminal has an inserting portion extending in the axial direction; the filter circuit board comprises: two power conductors, for receiving an external power source, each power conductor having an inserting hole to establish an electrical connection with the inserting portion of a corresponding power terminal, an insulating support frame molded onto the two power conductors, and at least one filter element, one end of the at least one filter element being connected to a corresponding power conductor, the other end of the at least one filter element being grounded; and wherein each power conductor has at least one bump, and the end of the at least one filter element is spot welded to the at least one bump; wherein the filter circuit board further comprises at least one grounding conductor configured to be grounded, and the at least one filter element is grounded by connecting the at least one grounding conductor; wherein the cylindrical insulating body has at least one opening in a circumferential side surface, and the at least one grounding conductor has an extended grounding portion which is arranged at the at least one opening; and the end cap is at least partially disposable inside an open end of a stator housing of the electric motor, and the grounding portion is clampable between the stator housing and a metal cover mounted to the open end of the stator housing. each power terminal has an inserting portion extending in the axial direction; the filter circuit board comprises: two power conductors, for receiving an external power source, each power conductor having an inserting hole to establish an electrical connection with the inserting portion of a corresponding power terminal, an insulating support frame molded onto the two power conductors, and at least one filter element, one end of the at least one filter element being connected to a corresponding power conductor, the other end of the at least one filter element being grounded; and wherein each power conductor has at least one bump, and the end of the at least one filter element is spot welded to the at least one bump; wherein the filter circuit board further comprises at least one grounding conductor configured to be grounded, and the at least one filter element is grounded by connecting the at least one grounding conductor; wherein the cylindrical insulating body has at least one opening in a circumferential side surface, and the at least one grounding conductor has an extended grounding portion which is arranged at the at least one opening; and the end cap is at least partially disposable inside an open end of a stator housing of the electric motor, and the grounding portion is clampable between the stator housing and a metal cover mounted to the open end of the stator housing. two power conductors, for receiving an external power source, each power conductor having an inserting hole to establish an electrical connection with the inserting portion of a corresponding power terminal, an insulating support frame molded onto the two power conductors, and at least one filter element, one end of the at least one filter element being connected to a corresponding power conductor, the other end of the at least one filter element being grounded; and wherein each power conductor has at least one bump, and the end of the at least one filter element is spot welded to the at least one bump; wherein the filter circuit board further comprises at least one grounding conductor configured to be grounded, and the at least one filter element is grounded by connecting the at least one grounding conductor; wherein the cylindrical insulating body has at least one opening in a circumferential side surface, and the at least one grounding conductor has an extended grounding portion which is arranged at the at least one opening; and the end cap is at least partially disposable inside an open end of a stator housing of the electric motor, and the grounding portion is clampable between the stator housing and a metal cover mounted to the open end of the stator housing.