U.S. patent application number 10/382911 was filed with the patent office on 2004-08-19 for single magnetic conductive plate structure for forming a single pole plate brushless dc motor.
This patent application is currently assigned to Sunonwealth Electric Machine Industry Co., Ltd.. Invention is credited to Hong, Ching-Sheng, Horng, Alex, Horng, Yin-Rong.
Application Number | 20040160135 10/382911 |
Document ID | / |
Family ID | 33457978 |
Filed Date | 2004-08-19 |
United States Patent
Application |
20040160135 |
Kind Code |
A1 |
Horng, Alex ; et
al. |
August 19, 2004 |
SINGLE MAGNETIC CONDUCTIVE PLATE STRUCTURE FOR FORMING A SINGLE
POLE PLATE BRUSHLESS DC MOTOR
Abstract
A single magnetic conductive plate for a single pole plate
brushless dc motor comprises a pole plate, a plurality of pole
faces, and an axial hole. The pole plate, the pole faces and an
axial hole are integrated into the single magnetic conductive
plate. The pole plate is regarded as a base and adapted to combine
with a coil to form a stator. The pole faces are punched and
equi-spaced round the axial hole proximal the coil. The axial hole
is adapted to combine with a mounting seat for supporting a
rotor.
Inventors: |
Horng, Alex; (Kaohsiung,
TW) ; Horng, Yin-Rong; (Kaohsiung, TW) ; Hong,
Ching-Sheng; (Kaohsiung, TW) |
Correspondence
Address: |
BACON & THOMAS, PLLC
625 SLATERS LANE
FOURTH FLOOR
ALEXANDRIA
VA
22314
|
Assignee: |
Sunonwealth Electric Machine
Industry Co., Ltd.
Kaohsiung
TW
|
Family ID: |
33457978 |
Appl. No.: |
10/382911 |
Filed: |
March 7, 2003 |
Current U.S.
Class: |
310/67R ;
310/164; 310/257 |
Current CPC
Class: |
H02K 21/24 20130101;
H02K 1/145 20130101; H02K 21/227 20130101; H02K 29/08 20130101;
Y10S 310/06 20130101 |
Class at
Publication: |
310/067.00R ;
310/164; 310/257 |
International
Class: |
H02K 007/00; H02K
011/00; H02K 019/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 14, 2003 |
JP |
2003-037268 |
Claims
What is claimed is:
1. A single magnetic conductive plate for a single pole plate
brushless de motor, comprising: a pole plate made of a single
magnetic conductive sheet and served as a base plate for combing
with a coil; a plurality of pole faces punched by the single
magnetic conductive sheet; and an axial hole formed at a center of
the pole plate.
2. The single magnetic conductive plate as defined in claim 1,
wherein the pole faces are equi-spaced round the axial hole.
3. The single magnetic conductive plate as defined in claim 1,
wherein the pole faces are consisted of an inner pole face set and
an outer pole face set which are equi-spaced on two concentric
circles.
4. The single magnetic conductive plate as defined in claim 3,
wherein the inner and outer pole face sets are arranged in
staggered manner.
5. The single magnetic conductive plate as defined in claim 3,
wherein the inner and outer pole face sets are arranged in radial
aligned manner.
6. The single magnetic conductive plate as defined in claim 1,
wherein the pole faces are further bent to form axial pole faces
adapted to face an axial permanent magnet of a rotor so that the
axial pole faces are actuating the axial permanent magnet.
7. The single magnetic conductive plate as defined in claim 6,
wherein the pole faces are bent inward to form the associated axial
pole faces.
8. The single magnetic conductive plate as defined in claim 6,
wherein the pole faces are bent outward to form the associated
axial pole faces.
9. The single magnetic conductive plate as defined in claim 1,
wherein the coil is proximal an inner circumference of the pole
faces.
10. The single magnetic conductive plate as defined in claim 1,
wherein the coil is proximal an outer circumference of the pole
faces.
11. The single magnetic conductive plate as defined in claim 3,
wherein the coil is proximal an inner circumference of the inner
pole face set.
12. The single magnetic conductive plate as defined in claim 1,
wherein the axial hole is adapted to combine with a mounting seat
for accommodating a bearing and a rotor extending therethrough.
13. The single magnetic conductive plate as defined in claim 1,
wherein the axial hole projecting a mounting seat for integrating
therewith.
14. The single magnetic conductive plate as defined in claim 12,
wherein the pole plate is served as the base plate for supporting
stator members, such as a printed circuit board.
15. The single magnetic conductive plate as defined in claim 14,
wherein the pole plate further comprises a through hole, a wire
extending from the printed circuit board to a permanent magnet of a
rotor, and a Hall element connecting to the wire.
16. The single magnetic conductive plate as defined in claim 15,
wherein the pole plate further comprises a recession adapted to
receive the Hall element.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention is related to a singel magnetic
conductive plate structure for forming a single pole plate
brushless de motor and more particularly to a single magnetic
conductive plate being punched to form a pole plate, pole faces, an
axial hole and a base that stator members are reduced in
amount.
[0003] 2. Description of the Related Art
[0004] Referring to FIG. 1, an axial winding stator generally
comprises an upper pole plate set 10a, a lower pole plate set 10b,
a coil 20, a stator seat 21, and an axial tube 22. The pole plate
sets 10a and 10b are attached to either side of the stator seat 21
and consisted of pole plates 11a and 11b, and pole faces 12a and
12b. In assemble operation, the coil 20 is wound the stator seat 21
and the axial tube 22 is extended successively through an axial
hole 13a of the upper pole plate set 10a, a center hole 23 of the
stator seat 21 and an axial hole 13b of the lower pole plate set
10b that a motor stator is constituted. Consequently, the stacked
combination of the stator members must increase their axial
thickness. However, the total thickness of the conventional motor
cannot be effectively reduced and it is undesired for an electronic
device with a specific thin thickness, a notebook computer for
example.
[0005] The present invention intends to provide a single magnetic
conductive plate being punched to form a pole plate, pole faces, an
axial hole, and a base that stator members are reduced. The base is
adapted to support a coil and a substrate to reduce a total
thickness of a stator and manufacture cost in such a way to
mitigate and overcome the above problem.
SUMMARY OF THE INVENTION
[0006] The primary objective of this invention is to provide a
single magnetic conductive plate for forming a single pole plate
brushless de motor, which is punched to form a pole plate, pole
faces, an axial hole and a base so as to reduce the count of the
stator members and an axial thickness thereof.
[0007] The secondary objective of this invention is to provide the
single magnetic conductive plate for forming the single pole plate
brushless dc motor, which is regarded as a base for supporting a
coil and a substrate so as to simplify the entire structure of the
stator and reduce manufacture cost.
[0008] The single magnetic conductive plate for forming the single
pole plate brushless dc motor of the present invention mainly
comprises a pole plate, a plurality of pole faces, and an axial
hole. The pole plate, the pole faces and an axial hole are
integrated into the single magnetic conductive plate. The pole
plate is regarded as a base and adapted to combine with a coil to
form a stator. The pole faces are punched and equi-spaced round the
axial hole proximal the coil. The axial hole is adapted to combine
with a mounting seat for supporting a rotor.
[0009] Other objectives, advantages and novel features of the
invention will become more apparent from the following detailed
description and the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The present invention will now be described in detail with
reference to the accompanying drawings herein:
[0011] FIG. 1 is an exploded perspective view of a conventional
brushless dc motor in accordance with prior art;
[0012] FIG. 2 is a perspective view of a single magnetic conductive
plate in accordance with a first embodiment of the present
invention;
[0013] FIG. 3 is a cross-sectional view of combing a single pole
plate brushless motor with a rotor in accordance with the first
embodiment of the present invention;
[0014] FIG. 4 is a perspective view of a single magnetic conductive
plate in accordance with a second embodiment of the present
invention;
[0015] FIG. 5 is a cross-sectional view of combing a first single
pole plate brushless motor with a rotor in accordance with the
second embodiment of the present invention;
[0016] FIG. 6 is a cross-sectional view of combing a second single
pole plate brushless motor with a rotor in accordance with the
second embodiment of the present invention;
[0017] FIG. 7 is a cross-sectional view of combing a third single
pole plate brushless motor with a rotor in accordance with the
second embodiment of the present invention;
[0018] FIG. 8 is a perspective view of a single magnetic conductive
plate in accordance with a third embodiment of the present
invention;
[0019] FIG. 9 is a cross-sectional view of combing a single pole
plate brushless motor with a rotor in accordance with the third
embodiment of the present invention;
[0020] FIG. 10 is a perspective view of a single magnetic
conductive plate in accordance with a fourth embodiment of the
present invention; and
[0021] FIG. 11 is a cross-sectional view of combing a single pole
plate brushless motor with a rotor in accordance with the fourth
embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0022] Referring now to the drawings, there are four embodiments of
the present invention shown therein, all of which include generally
a primary stator member and a secondary rotor member.
[0023] Referring initially to FIGS. 2 and 3, a single pole plate
brushless dc motor in accordance with the present invention
generally includes a single magnetic conductive plate designated as
numeral 10, a coil designated as numeral 20, and a rotor designated
as numeral 30. The axial combination of the single magnetic
conductive plate 10 and the coil 20 is adapted to combine with the
rotor 30 to form a single pole plate brushless dc motor.
[0024] Construction of the single magnetic conductive plate 10
shall be described in detail, referring now to FIGS. 2 and 3. The
single magnetic conductive plate 10 is punched and formed by a
magnetic-conductive sheet. The single magnetic conductive plate 10
comprises a pole plate 11, a plurality of pole faces 12, and an
axial hole 13. The main body of the single magnetic conductive is
formed as the pole plate 11 and it is regarded as a base for
supporting stator members--a coil 20 and a substrate 26 for
example. The pole faces 12 are projected in a vertical direction
from the pole plate 11 and circled a space round the axial hole 13
for accommodating stator components. The axial hole 13 is formed at
a center of the pole plate 11 and adapted to receive a mounting
seat 24 and a bearing 25 to thereby form a stator. In assemble
operation, the bearing 25 is employed for receiving passage of a
shaft 31 of the rotor 30 so that a permanent magnet 32 of the rotor
30 is able to radially align with one of an inner circumference or
an inner circumference of the pole faces 12. On the contrary, the
coil 20 is attached to the other circumference of the pole faces 12
while a radial air gap forming between the pole faces 12 and the
permanent magnet 32 and having a predetermined distance
therebetween. In rotation operation, when the substrate (PCB) 26
energizes the coil 20, the pole faces 12 generates an alternative
magnetic field in the air gap to thereby rotate the rotor 30.
[0025] Assembling the stator shall now be described with reference
to FIG. 3. The pole plate 11 is further provided with a through
hole 14 through which a wire 261 of the substrate 26 is passed and
it is extended to a recession (not shown) proximal the permanent
magnet 32. A Hall element 262 is placed in the recession to thereby
extend proximal the permanent magnet 32 and detects its poles
during operation. In addition, in manufacture operation of the
single magnetic conductive plate 10, the mounting seat 24 is
integrally projected from the axial hole 13 in vertical to thereby
reduce stator members in amount.
[0026] Referring to FIGS. 4 through 11, reference numerals of
second through fourth embodiments have applied the identical
numerals of the first embodiment. Single magnetic conductive plates
of the second through fourth embodiments have the similar
configuration and same function as the first embodiment and the
detailed descriptions are omitted.
[0027] Referring to FIGS. 4 and 5, a single magnetic conductive
plate 10 in accordance with the second embodiment, in comparison
with the first embodiment, comprises an additional set of pole
faces 12'. The pole faces 12' are formed from an inner periphery of
the axial hole 13 and served as an inner pole face set while the
pole faces 12 serving as an outer pole face set. In structural
arrangement, the pole faces 12 and 12' are equi-spaced on two
concentric circles round the axial hole 13. Preferably, the two
sets of the pole faces 12 and 12' are arranged in staggered manner
or radial aligned manner so that the design choice of the single
magnetic conductive plate is increased.
[0028] Referring again to FIG. 5, in assemble operation, the coil
12 is proximal the inner circumferences of the pole faces 12. It is
a preferred choice that the rotor 30 is formed with a relatively
large diameter so that the permanent magnet 32 of the rotor 30 is
aligning with an outer circumference of the pole laces 12. In
rotation operation, an alternative magnetic field of the pole faces
12 drives the permanent magnet 32 of the rotor 30.
[0029] Referring again to FIG. 6, in assemble operation, the coil
12 is proximal the inner circumferences of the pole faces 12'. It
is an another preferred choice that the rotor 30 is formed with a
relatively small diameter so that the permanent magnet 32 of the
rotor 30 is running between the two sets of the pole faces 12 and
12'. In rotation operation, an alternative magnetic field of the
pole faces 12' drives the permanent magnet 32 of the rotor 30.
[0030] Referring again to FIG. 7, the single magnetic conductive
plate 10 is applied to an axial air gap of the motor structure. The
rotor 13 comprises an axial permanent magnet 32' to form an axial
air gap with the pole faces 12 and 12'. In rotation operation, an
alternative magnetic field of the pole faces 12 and 12' drives the
permanent magnet 32' of the rotor 30.
[0031] Referring again to FIG. 5, a wire 261 of the substrate 26 is
passed through the pole faces 12' and extended to a through hole
14' proximal the permanent magnet 32. A Hall element 262 is placed
in the through hole 14' to thereby extend proximal the permanent
magnet 32 and detect its poles during operation.
[0032] Referring again to FIG. 6, a wire 261 of the substrate 26 is
extended to the through hole 14' proximal the permanent magnet 32.
A Hall element 262 is placed in the through hole 14' to thereby
extend proximal the permanent magnet 32 and detect its poles during
operation.
[0033] Referring again to FIG. 7, a Hall element 262 is projected
from the substrate 26 to thereby extend proximal the permanent
magnet 32 and detect its poles during operation.
[0034] Referring to FIGS. 8 and 9, a single magnetic conductive
plate 10 in accordance with the third embodiment, in comparison
with the first and second embodiments, comprises axial pole faces
121 instead of radial pole faces. The axial pole faces 121 are bent
inward from the pole faces 12 and applied to an axial air gap of
the motor structure.
[0035] Referring again to FIG. 9, in assemble operation, the axial
pole plates 121 are facing the axial permanent magnet 32' of the
rotor 30 to form an axial air gap. In rotation operation, an
alternative magnetic field of the axial pole faces 121 drives the
axial permanent magnet 32' of the rotor 30.
[0036] Referring to FIGS. 10 and 11, a single magnetic conductive
plate 10 in accordance with the fourth embodiment, in comparison
with the third embodiment, comprises axial pole faces 122 extending
outward instead of extending inward. The axial pole faces 122 are
bent outward from the pole faces 12 and applied to an axial air gap
of the motor structure.
[0037] Referring again to FIG. 11, in assemble operation, the axial
pole plates 122 are facing the axial permanent magnet 32' of the
rotor 30 to form an axial air gap. In rotation operation, an
alternative magnetic field of the axial pole faces 122 drives the
axial permanent magnet 32' of the rotor 30.
[0038] Referring again to FIGS. 1 and 2, a single magnetic
conductive plate 12 is made of a single magnetic conductive sheet
and punched to form a pole plate 11, pole faces 12 and an axial
hole 13. The pole plate 11 is served as a base to support stator
members. In comparison with the conventional motor, the single
magnetic conductive plate 12 is able to simplify entire structure,
to lower manufacture cost, to reduce total thickness and to
increase design choice.
[0039] Although the invention has been described in detail with
reference to its presently preferred embodiment, it will be
understood by one of ordinary skill in the art that various
modifications can be made without departing from the spirit and the
scope of the invention, as set forth in the appended claims.
* * * * *