Electric motor and method of making the same

1. An electric motor comprising:

a stator comprising:

a housing having an open end;

a plurality of adhesive strips applied on an inner surface of the housing;

a plurality of magnets bonded to the inner surface of the housing by the adhesive strips, wherein the adhesive covers at least 70% of the outer surface of each magnet after the magnets are assembled to the housing; and

an end cap assembly mounted to the open end of the housing; and

a rotor mounted to the stator, wherein the adhesive strips are formed in an annular shape and are arranged in parallel along an axial direction of the housing, each magnet has a first axial end projecting on the inner surface of the housing at a first line, and a second axial end projecting on the inner surface of the housing at a second line, the adhesive strips located between the first line and the second line.

2. The electric motor of claim 1 , wherein one of the adhesive strips located closest to the first line is spaced from the first line by a distance ranged from 0.5 mm to 1.0 mm.

3. The electric motor of claim 1 , wherein the housing has a non-circular cross section.

4. The electric motor of claim 3 , wherein the housing has a polygon cross section, comprising four side portions and four corner portions, the side portions and corner portions are arranged alternately in a circumferential direction of the housing, and the corner portion is curved and convex.

5. The electric motor of claim 4 , wherein the side portion is curved and convex.

6. The electric motor of claim 5 , wherein the side portion comprises two arc segments and a straight segment connected between the arc segments, each of the arc segments adjoining a respective corner portion.

7. The electric motor of claim 4 , wherein the magnets are arranged corresponding to the corner portions, in such a manner that a circumferential central portion of each magnet corresponds to a respective corner portion, and two circumferential end portions of each magnet correspond to side portions adjacent to the corner portion.

8. The electric motor of claim 7 , wherein the magnet is bonded to the inner surface of the housing by at least three adhesive strips, at least one of the adhesive strip is applied on the inner surface of the corner portion, and at least one of the adhesive strips is applied on the inner surface of the side portion adjacent to the corner portion.

9. The electric motor of claim 1 , wherein the adhesive strips cover at least 80% area of the outer surface of the magnet.

10. The electric motor of claim 1 , wherein the adhesive strips cover at least 90% area of the outer surface of the magnet.

11. A method of manufacturing an electric motor, comprising the steps of:

providing a housing assembly;

providing a rotor assembly;

providing an end cap assembly; and

assembling the housing assembly, the rotor assembly and the end cap assembly together,

wherein the step of providing the housing assembly comprises:

providing a housing having an open end;

applying strips of adhesive onto an inner surface of the housing;

providing a plurality of magnets; and

bonding the magnets to the inner surface of the housing via the adhesive, wherein bonding the magnets to the inner surface of the housing comprises pressing the magnets towards the housing to make the strips of adhesive become thinner and wider under the pressure applied by the magnets, wherein before pressing the magnets, the strips of adhesive are spaced from one axial end of each of the magnets positioned to the inner surface of the housing to form a gap between the axial end of each of the magnets and the inner surface of the housing, and then the gaps are filled by one of the trips of adhesive after the magnets are pressed to make the strips of adhesive become thinner and wider.

12. The method of claim 11 , wherein the strips of adhesive are applied in a circumferential direction of the housing.