Electromagnetic coil, mold, and electromagnetic coil manufacturing method

A mold for injection molding electromagnetic coils, wherein the electromagnetic coil comprises an annular body, an inner peripheral wall of the annular body comprises a plurality of claw poles spaced apart in a circumferential direction, an encapsulation layer and a frame, and the encapsulation layer encapsulates an upper annular wall, a lower annular wall, and an outer peripheral wall of the annular body, the encapsulation layer is not disposed between the claw poles;

• the encapsulation layer is formed of a resin material by injection molding,
• wherein the mold comprises an upper mold and a lower mold, wherein the mold defines a mold cavity, the upper mold comprises a first abutting part and a first groove part, and the lower mold comprises a second abutting part and a second groove part;
• the mold further comprises an injection port, and the injection port communicates with the mold cavity;
• during the injection molding, the second abutting part is axially abutted against the lower annular wall of the annular body, and the first abutting part is axially abutted against the upper annular wall of the annular body;
• and
• a space between the first groove part and the upper annular wall of the annular body is configured to accommodate the resin material that encapsulates the upper annular wall, and a space between the second groove part and the lower annular wall of the annular body is configured to accommodate the resin material that encapsulates the lower annular wall, and the upper annular wall, the lower annular wall and the outer periphery wall of the annular body are provided therein with the encapsulation layer.