Outer rotor motor
An outer rotor motor includes a stator, a rotor rotatably disposed outside the stator, a mounting seat, a rotation shaft driven by the rotor, and two bearing mounted to the mounting seat to rotatably support the rotation shaft. The stator includes a stator core and a stator winding wound around the stator core. The mounting seat includes an upper bracket seated on one of opposite axial ends of the rotor, a lower bracket seated on the other axial end of the rotor, a connecting member connected between the upper bracket and the lower bracket, and a cylindrical mounting post fixed to the upper bracket. The cylindrical mounting post extends through and is fixed in the stator core. The rotation shaft is rotatably received in the mounting post. The two bearings are avoided overlapping the stator core in the axial direction.
1. An outer rotor motor comprising:
a stator comprising a stator core and a stator winding wound around the stator core;
a rotor rotatably disposed outside the stator;
a mounting seat comprising an upper bracket seated on one of opposite axial ends of the rotor, a lower bracket seated on the other axial end of the rotor, a connecting member connected between the upper bracket and the lower bracket, and a cylindrical mounting post fixed to the upper bracket, the cylindrical mounting post extending through and fixed in the stator core;
a rotation shaft driven by the rotor and rotatably extending through the cylindrical mounting post; and
two bearings mounted to the mounting seat to rotatably support the rotation shaft, the two bearings are avoided overlapping the stator core in the axial direction;
wherein the cylindrical mounting post comprises a large-diameter portion and a small-diameter portion co-axially connected with the large-diameter portion, the small-diameter portion is disposed between the upper bracket and the lower bracket, the stator core is attached to and supported on the small-diameter portion of the cylindrical mounting post, the large-diameter portion of mounting post is disposed at a side of the upper bracket away from the lower bracket, one of the two bearings is mounted in the large-diameter portion of the cylindrical mounting post.
2. The outer rotor motor of claim 1 , wherein the upper bracket, the lower bracket and the cylindrical mounting post are respectively separately formed.
3. The outer rotor motor of claim 2 , wherein the two bearing comprises a first bearing mounted to an end of the cylindrical mounting post at a side of the upper bracket away from the stator core, and a second bearing mounted to the lower bracket.
4. The outer rotor motor of claim 1 , wherein the cylindrical mounting post is made of plastics by injection molding.
5. The outer rotor motor of claim 4 , wherein the first bearing is embedded in the cylindrical mounting post by over mold.
6. The outer rotor motor of claim 1 , wherein the upper bracket and the lower bracket are sheet-metal parts, the connecting member is made of metal or plastics.
7. The outer rotor motor of claim of 6 , wherein
the upper bracket comprises:
a plate-like main portion,
two wing portions respectively extending from opposite end of the main portion in same direction perpendicular to the main portion, and
two mounting flanges respectively formed at distal ends of the two wing portions;
the lower bracket comprises:
a plate-like main portion,
two wing portions respectively extending from opposite end of the main portion in same direction perpendicular to the main portion, and
two mounting flanges respectively formed at distal ends of the two wing portions;
the connecting member is substantially annular and has two mounting stands thereon;
the mounting flanges of the upper bracket, the mounting flanges of the lower bracket, and the mounting stands of the connecting member are correspondingly fixed to each other.
8. The outer rotor motor of claim 7 , wherein each of the mounting flanges of the upper bracket and the lower bracket defines a plurality of mounting hole; each of the mounting stands defines a plurality of fixing holes, the mounting flanges of the upper bracket, the mounting flanges of the upper bracket, and the mounting stands of the connecting member are correspondingly fixed to each other by a plurality of fasteners correspondingly passing through the mounting holes of the upper bracket, the mounting holes of the lower bracket, and the fixing holes of the connecting member.
9. The outer rotor motor of claim 3 , wherein the lower bracket defines a depression in a side of main portion of the lower bracket facing the upper bracket, and is provided with a latching member, the second bearing is received in the depression, the latching member presses against a top of the second bearing to retain the second bearing in place.
10. The outer rotor motor of claim 1 , wherein the rotor comprises a rotor holder and a magnet attached to the rotor holder, the rotor holder is unrotatably connected to the rotation shaft by a locking ring.
11. The outer rotor motor of claim 10 , wherein the rotor holder comprises a magnet cylindrical mounting portion and a plate-like connecting portion connected to an end of the mounting portion, the connecting portion defines a through hole; the rotation shaft fixed in the through hole of the connecting portion with the locking ring fixedly sleeved on the rotation shaft and fastened in the through hole.
12. The outer rotor motor of claim 1 , wherein the rotation shaft is sleeved by a sleeve having an length smaller than that of the rotation shaft, opposite ends of the rotation shaft extend out of sleeve.
13. The outer rotor motor of claim 12 , wherein the sleeve is rotatably received in the cylindrical mounting post together with the rotation shaft; an end of the sleeve extends out of the cylindrical mounting post to resist against the lower bracket to prevent the cylindrical mounting post from contacting with the lower bracket and thereby being worn out in high speed rotation.
14. The outer rotor motor of claim 1 , further comprising a control board selectively mounted to the upper bracket or the lower bracket.
15. The outer rotor motor of claim 1 is a brushless DC motor.
16. A motor comprising:
a stator comprising a stator core and a stator winding wound around the stator core;
a rotor rotatably disposed outside the stator;
a mounting seat comprising an upper bracket seated on one of opposite axial ends of the rotor, a lower bracket seated on the other axial end of the rotor, a connecting member connected between the upper bracket and the lower bracket, and a cylindrical mounting post fixed to the upper bracket, the cylindrical mounting post at least partially extending through and fixed in the stator core;
a rotation shaft driven by the rotor and rotatably extending through the cylindrical mounting post; and
wherein the cylindrical mounting post comprises a large-diameter portion and a small-diameter portion co-axially connected with the large-diameter portion, the small-diameter portion is disposed between the upper bracket and the lower bracket, the stator core is attached to and supported on the small-diameter portion of the cylindrical mounting post, the large-diameter portion of mounting post is disposed at a side of the upper bracket away from the lower bracket.
17. The motor as claimed in claim 16 , wherein a bearing is mounted in the large-diameter portion of the cylindrical mounting post.
18. The motor as claimed in claim 16 , wherein the upper bracket comprises:
a plate-like main portion defining a through hole for the cylindrical mounting post passing therethrough;
two wing portions respectively extending from opposite end of the main portion in same direction perpendicular to the main portion; and
two mounting flanges respectively formed at distal ends of the two wing portions.
19. The motor as claimed in claim 16 , wherein the lower bracket comprises:
a plate-like main portion;
two wing portions respectively extending from opposite end of the main portion in same direction perpendicular to the main portion; and
two mounting flanges respectively formed at distal ends of the two wing portions;
the connecting member is substantially annular and has two mounting stands thereon;
the mounting flanges of the upper bracket, the mounting flanges of the lower bracket, and the mounting stands of the connecting member are correspondingly fixed to each other.
20. The motor as claimed in claim 16 , wherein the lower bracket defines a depression in a side of main portion of the lower bracket facing the upper bracket, and is provided with a latching member, another bearing is received in the depression, the latching member presses against the second bearing to retain the second bearing in place.