CN-224233464-U - Motor

Abstract

The utility model provides a motor, which comprises a shell and a motor body accommodated in the shell, wherein the motor body comprises a stator assembly and a rotor assembly rotating around the axis of the stator assembly, the shell is provided with a plurality of air inlet windows, the air inlet windows are positioned at the axial end parts of the stator assembly, the position of each air inlet window is correspondingly arranged with a gap between two adjacent stator coils of the stator assembly, and external air flow enters the stator assembly from the air inlet windows. According to the motor provided by the utility model, the air inlet window is arranged at the corresponding position of the gap between the adjacent two stator coils of the stator assembly in the shell, so that external air flow enters the stator assembly from the air inlet window, and compared with the existing motor, the air flow of the external air flow entering the stator assembly is greatly improved, and the heat dissipation and cooling effects of the motor are further greatly improved.

Inventors

• LI LAIFU
• ZHANG MIN

Assignees

• 江苏东成工具科技有限公司

Dates

Publication Date

20260512

Application Date

20250508

Claims (10)

1. 1. An electric machine, the electric machine comprising: The motor comprises a shell, a motor body accommodated in the shell and a cooling fan mounted to the motor body, wherein the motor body comprises a stator assembly and a rotor assembly rotating around the axis of the stator assembly, and the shell is provided with an air inlet and an air outlet; the cooling fan sucks external air from the air inlet, flows through the stator assembly and is discharged from the air outlet, and the air inlet and the air outlet are positioned at two axial ends of the motor body; The casing is equipped with the fresh air inlet window that runs through, the fresh air inlet window is located stator module's axial tip, just the air intake with fresh air inlet window homonymy sets up, every fresh air inlet window's position with clearance between two adjacent stator coils of stator module corresponds the setting, and outside air current is followed fresh air inlet window gets into stator module.
2. 2. The electric machine of claim 1, wherein the air intake extends axially through the housing, the air intake having a smaller cross-sectional area toward the stator assembly than the air intake facing away from the stator assembly.
3. 3. The motor of claim 2, wherein the radial shape of the air inlet window is an isosceles trapezoid, a short side of the isosceles trapezoid is close to the axis of the motor body, and a long side of the isosceles trapezoid is far away from the axis of the motor body.
4. 4. The motor of claim 3, wherein the radial cross-sectional area of the air inlet window is gradually reduced from outside to inside along the axial direction of the motor body, and the wall surface of the air inlet window formed in the casing is a smooth surface with smooth transition.
5. 5. The electric machine of claim 1, wherein the rotor assembly includes a rotor and a motor shaft held to the rotor, the cooling fan being held to the motor shaft and the cooling fan being located at an axially outer end of the air intake window, the cooling fan directing an external air flow from the air intake window to the stator assembly.
6. 6. The electric machine of claim 5, wherein the air intake windows are evenly distributed around the circumference of the motor shaft, the number of air intake windows being the same as the number of stator coils of the stator assembly.
7. 7. The motor of claim 5, wherein the motor body includes a pod coupled to an end of the housing, the pod being positioned axially rearward of the air intake window.
8. 8. The motor of claim 7, wherein the pod is of a horn-like configuration, and wherein an inner diameter of a cross section of the pod proximate the inlet window is less than an inner diameter of a cross section of the pod distal the inlet window.
9. 9. The electric machine of claim 8, wherein the radial cross-sectional area of the pod tapers and transitions smoothly from outside to inside along the axial direction of the machine body, the pod being integrally injection molded.
10. 10. The motor of claim 9, wherein the axial length of the pod ranges from 1 cm to 3 cm.

Description

Motor Technical Field The utility model relates to the technical field of motors, in particular to a motor of an electric tool. Background The motor is an electromagnetic device for converting or transmitting electric energy according to the law of electromagnetic induction. The motor operates mainly based on ampere force law and electromagnetic induction law. The energized conductor receives ampere force in the magnetic field, when the stator winding of the motor is energized with current, a rotating magnetic field is generated, the rotor conductor cuts the magnetic induction line in the rotating magnetic field, induced electromotive force and induced current are generated, and then the energized conductor receives ampere force, so that the rotor rotates, and conversion from electric energy to mechanical energy is realized. The motor generally dissipates heat by a cooling fan, which is generally mounted at an axial end of an electromechanical shaft penetrating the casing. The cooling fan of the existing motor is arranged outside the shell, so that air flow blown into the motor by the cooling fan can be reduced due to the ribs of the shell, and part of air flow blown into the motor can be shielded by the stator coil, so that the heat dissipation and cooling effects of the motor are greatly affected. In view of the foregoing, it is necessary to provide a solution to the above-mentioned problems. Disclosure of Invention The utility model mainly aims to provide a motor, which aims to improve the heat dissipation and cooling effects of the motor. In order to achieve the above object, an embodiment of the present utility model provides an electric motor including: The motor comprises a shell and a motor body accommodated in the shell, wherein the motor body comprises a stator assembly and a rotor assembly rotating around the axis of the stator assembly; The casing is provided with a plurality of air inlet windows, the air inlet windows are positioned at the axial end parts of the stator assembly, the position of each air inlet window is correspondingly arranged with a gap between two adjacent stator coils of the stator assembly, and external air flow enters the stator assembly from the air inlet windows. In some embodiments, the air inlet window extends axially through the housing, and a cross-sectional area of the air inlet window toward the stator assembly is less than a cross-sectional area of the air inlet window away from the stator assembly. In some embodiments, the radial shape of the air inlet window is an isosceles trapezoid structure, a short side of the isosceles trapezoid structure is close to the axis of the motor body, and a long side of the isosceles trapezoid structure is far away from the axis of the motor body. In some embodiments, the radial cross-sectional area of the air inlet window gradually decreases from outside to inside along the axial direction of the motor body, and the wall surface of the air inlet window formed in the casing is a smooth surface with smooth transition. In some embodiments, the rotor assembly includes a rotor and a motor shaft held to the rotor, the motor body includes a cooling fan between the stator assembly and the air intake window and held to the motor shaft, the cooling fan directing an external air flow from the air intake window to the stator assembly. In some embodiments, the air inlet windows are evenly distributed around the circumference of the motor shaft, the number of air inlet windows being the same as the number of stator coils of the stator assembly. In some embodiments, the motor body includes a pod coupled to an end of the housing, the pod being located at an axially rearward end of the air intake window. In some embodiments, the air guide sleeve is in a horn-shaped structure, and the inner diameter of the cross section of the air guide sleeve, which is close to the air inlet window, is smaller than the inner diameter of the cross section of the air guide sleeve, which is far away from the air inlet window. In some embodiments, the radial cross-sectional area of the air guide sleeve gradually becomes smaller and smoothly transits from outside to inside along the axial direction of the motor body, and the air guide sleeve is integrally injection molded. In some embodiments, the axial length of the air guide sleeve ranges from 1 cm to 3 cm. The motor has the beneficial effects that the air inlet window is arranged on the shell corresponding to the gap between the adjacent two stator coils of the stator assembly in the shell, so that external air flow enters the stator assembly from the air inlet window, and compared with the existing motor, the air flow of the external air flow entering the stator assembly is greatly improved, and the heat dissipation and cooling effects of the motor are further greatly improved. Drawings The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consiste