DC brushless motor with external rotor

Patent metadata

Field	Value
Publication number	US-9385572-B2
Application number	US-201313844968-A
Country	US
Kind code	B2
Filing date	Mar 16, 2013
Priority date	Oct 31, 2012
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

A DC brushless motor having an external rotor, the motor including: a shaft, a stator assembly, an end cover, a housing, and a plurality of permanent magnets. The end cover includes a bearing. The housing includes: an inner wall, and an end. The shaft is connected with the stator assembly. The stator assembly is arranged inside the housing. The permanent magnets are positioned outside the stator assembly on the inner wall of the housing. The end cover is disposed on the end of the housing. The shaft is disposed on the bearing of the end cover.

First claim

The invention claimed is:

1. A DC brushless motor, comprising:
a) a shaft;
b) a stator assembly;
c) an end cover, the end cover comprising a bearing and a plurality of through holes;
d) a housing, the housing comprising: a side wall comprising an inner surface and an end; and
e) a plurality of permanent magnets;
wherein
the shaft is connected with the stator assembly;
the stator assembly is arranged inside the housing;
the permanent magnets are positioned outside the stator assembly and on the inner surface of the side wall of the housing;
a plurality of positions of the end of the side wall of the housing protrudes from the end of the side wall of the housing and is bent toward the shaft whereby forming a plurality of mounting bosses that is integral with the side wall of the housing;
an outer surface of each of the plurality of mounting bosses is substantially perpendicular to the inner surface of the side wall of the housing;
each of the plurality of mounting bosses comprises a threaded hole;
the end cover is disposed on the end of the housing, wherein the outer surface of each of the plurality of mounting bosses is in contact with the end cover;
each of the plurality of through holes is directly connected to the threaded hole of one of the plurality of mounting bosses;
the end cover is fixed on the plurality of mounting bosses by a screw;
the screw extends through the through hole, is received inside the threaded hole, and does not protrude out of the threaded hole; and
the shaft is disposed on the bearing of the end cover.

2. The motor of claim 1 , wherein
a gap is arranged in an axial direction on a side wall of the end cover outside the through hole;
a recess in a ring shape is arranged on the side wall of the end cover;
the gap is in communication with the recess;
an end of the inner surface of the side wall of the housing is convex to form a fixture block; and
the fixture block passes through the gap and is inserted into the recess.

3. The motor of claim 2 , wherein an end surface of the end cover is provided with a plurality of clay recesses.

4. The motor of claim 1 , wherein an end surface of the end cover is provided with a plurality of clay recesses.

5. The motor of claim 1 , wherein a mounting bracket is arranged outside the housing.

6. The motor of claim 1 , wherein
the stator assembly comprises: a stator core, and a winding;
the winding is wound on the stator core;
one end of an external lead is connected with one end of the winding; and
the other end of the external lead passes through a shaft hole of the shaft.

7. The motor of claim 1 , wherein the plurality of permanent magnets is stuck to the inner surface of the side wall of the housing by glue.

Assignees

• Zhongshan Broad Ocean Motor Co

Inventors

• Lu Chuping
• Tang Songfa
• Zeng Chongsheng

Classifications

• H02K7/003

  Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28) · CPC title

• H02K5/165 Primary

  radially supporting the rotor around a fixed spindle; radially supporting the rotor directly (H02K5/167, H02K5/173 take precedence) · CPC title

• H02K1/28

  Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures · CPC title

• H02K21/22 Primary

  with magnets rotating around the armatures, e.g. flywheel magnetos · CPC title

• H02K11/0094

  Structural association with other electrical or electronic devices · CPC title