US5804904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brushless DC motor and a method of generation power therewith
Assignee: Samsung Electronics Co Ltd
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Filing: 1997-01-16
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Granted: 1998-09-08
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Expires: 2017-01-16
Abstract
Abstract An improved 10-pole 9-slot brushless DC motor used as a spindle motor used in devices, such as a computer hard disk driver or a laser scanner, is provided which reduces cogging torque and improves driving torque. The motor includes a field magnet having an annular permanent magnet which is formed of 10 magnetic poles attached to each other in a radial orientation, for generating a flux field and an armature formed by winding an armature core formed of nine slots and nine salient-poles with windings connected in three phases. Also, the field magnet of the motor is rotated by the rotating magnetic field generated by the armature windings. Since the motor has a short cycle and low cogging torque, the motor is very stable. Also, torque ripple is low and the torque characteristics as a whole are improved, thus achieving high efficiency.
Inventors
- 👤 No-yeol Park
- 👤 Seong-man Jang
- 👤 Gun-hee Jang
- 👤 Jin-yook Yoon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:02
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/03; H02K23/00; H02K23/26; H02K21/00; H02K21/12; H02K21/22; H02K3/00; H02K3/04; H02K3/28
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
178 words
A brushless DC motor which generates power from the torque generated between a flux field and a rotating magnetic field, comprising: means for generating the flux field; and means for forming the rotating magnetic field with respect to the flux field, wherein said means for generating the flux field includes an annular field magnet having ten magnetic poles with surfaces alternately arranged in a ring-shaped form along a circumferential orientation and magnetically bonded to each other in a radial orientation, each having an opposing polarity with respect to adjacent magnetic poles, and wherein said means for forming the rotating magnetic field includes an armature core having nine salient-poles at regular intervals from the circumference opposing the surfaces of the magnetic poles of the annular field magnet, and having nine slots each formed between adjacent salient-poles, and having a plurality of armature windings wound around each of the salient-poles with at least one winding, wherein said plurality of armature windings are divided into three groups of windings wound around three consecutive of said nine salient-poles of said armature core.
Claim 2
Dependent Claim
178 words
A brushless DC motor which generates power from the torque generated between a flux field and a rotating magnetic field, comprising: means for generating the flux field; and means for forming the rotating magnetic field with respect to the flux field, wherein said means for generating the flux field includes an annular field magnet having ten magnetic poles with surfaces alternately arranged in a ring-shaped form along a circumferential orientation and magnetically bonded to each other in a radial orientation, each having an opposing polarity with respect to adjacent magnetic poles, and wherein said means for forming the rotating magnetic field includes an armature core having nine salient-poles at regular intervals from the circumference opposing the surfaces of the magnetic poles of the annular field magnet, and having nine slots each formed between adjacent salient-poles, and having a plurality of armature windings wound around each of the salient-poles with at least one winding, wherein said plurality of armature windings are divided into three groups of windings wound around three consecutive of said nine salient-poles of said armature core.
Claim 3
Dependent Claim
25 words
A brushless DC motor as claimed in claim 1, wherein said means for forming the rotating magnetic field is positioned within said annular field magnet.
Claim 4
Dependent Claim
198 words
A brushless DC motor which generates power from the torque generated between a flux field and a rotating magnetic field, comprising: means for generating the flux field; and means for forming the rotating magnetic field with respect to the flux field, wherein said means for generating the flux field includes an annular field magnet having ten magnetic poles with surfaces alternately arranged in a ring-shaped form along a circumferential orientation and magnetically bonded to each other in a radial orientation, each having an opposing polarity with respect to adjacent magnetic poles, and wherein said means for forming the rotating magnetic field includes an armature core having nine salient-poles at regular intervals from the circumference opposing the surfaces of the magnetic poles of the annular field magnet, and having nine slots each formed between adjacent salient-poles, and having a plurality of armature windings wound around each of the salient-poles with at least one winding, wherein said plurality of armature windings are divided into three groups of windings wound around three consecutive of said nine salient-poles of said armature core, and connected in three phases to permit voltages of different phases to be applied to the respective groups of windings.
Claim 5
Dependent Claim
198 words
A brushless DC motor which generates power from the torque generated between a flux field and a rotating magnetic field, comprising: means for generating the flux field; and means for forming the rotating magnetic field with respect to the flux field, wherein said means for generating the flux field includes an annular field magnet having ten magnetic poles with surfaces alternately arranged in a ring-shaped form along a circumferential orientation and magnetically bonded to each other in a radial orientation, each having an opposing polarity with respect to adjacent magnetic poles, and wherein said means for forming the rotating magnetic field includes an armature core having nine salient-poles at regular intervals from the circumference opposing the surfaces of the magnetic poles of the annular field magnet, and having nine slots each formed between adjacent salient-poles, and having a plurality of armature windings wound around each of the salient-poles with at least one winding, wherein said plurality of armature windings are divided into three groups of windings wound around three consecutive of said nine salient-poles of said armature core, and connected in three phases to permit voltages of different phases to be applied to the respective groups of windings.
Claim 6
Dependent Claim
19 words
A brushless DC motor as claimed in claim 3, wherein said three groups of windings form a Y connection.
Claim 7
Dependent Claim
139 words
A brushless DC motor which generates power from the torque generated between a flux field and a rotating magnetic field, comprising: a flux generator generating the flux field, and including an annular field magnet having ten magnetic poles with surfaces alternately arranged in a ring-shaped form along a circumferential orientation, each having an opposing polarity with respect to adjacent magnetic poles; and a magnetic field generator generating the rotating magnetic field with respect to the flux field, and including an armature core having nine salient-poles and nine slots each formed between adjacent salient-poles, and having a plurality of armature windings wound around at least one of the salient poles with at least one winding, wherein said plurality of armature windings are divided into three groups of windings wound around three consecutive of said nine salient-poles of said armature core.
Claim 8
Dependent Claim
139 words
A brushless DC motor which generates power from the torque generated between a flux field and a rotating magnetic field, comprising: a flux generator generating the flux field, and including an annular field magnet having ten magnetic poles with surfaces alternately arranged in a ring-shaped form along a circumferential orientation, each having an opposing polarity with respect to adjacent magnetic poles; and a magnetic field generator generating the rotating magnetic field with respect to the flux field, and including an armature core having nine salient-poles and nine slots each formed between adjacent salient-poles, and having a plurality of armature windings wound around at least one of the salient poles with at least one winding, wherein said plurality of armature windings are divided into three groups of windings wound around three consecutive of said nine salient-poles of said armature core.
Claim 9
Dependent Claim
159 words
A brushless DC motor which generates power from the torque generated between a flux field and a rotating magnetic field, comprising: a flux generator generating the flux field, and including an annular field magnet having ten magnetic poles with surfaces alternately arranged in a ring-shaped form along a circumferential orientation, each having an opposing polarity with respect to adjacent magnetic poles; and a magnetic field generator generating the rotating magnetic field with respect to the flux field, and including an armature core having nine salient-poles and nine slots each formed between adjacent salient-poles, and having a plurality of armature windings wound around at least one of the salient poles with at least one winding, wherein said plurality of armature windings are divided into three groups of windings wound around three consecutive of said nine salient-poles of said armature core, and connected in three phases to permit voltages of different phases to be applied to the respective groups of windings.
Claim 10
Dependent Claim
159 words
A brushless DC motor which generates power from the torque generated between a flux field and a rotating magnetic field, comprising: a flux generator generating the flux field, and including an annular field magnet having ten magnetic poles with surfaces alternately arranged in a ring-shaped form along a circumferential orientation, each having an opposing polarity with respect to adjacent magnetic poles; and a magnetic field generator generating the rotating magnetic field with respect to the flux field, and including an armature core having nine salient-poles and nine slots each formed between adjacent salient-poles, and having a plurality of armature windings wound around at least one of the salient poles with at least one winding, wherein said plurality of armature windings are divided into three groups of windings wound around three consecutive of said nine salient-poles of said armature core, and connected in three phases to permit voltages of different phases to be applied to the respective groups of windings.
Claim 11
Dependent Claim
21 words
A brushless DC motor as claimed in claim 6, wherein said three groups of windings form a three phase Y connection.
Claim 12
Dependent Claim
65 words
A brushless DC motor as claimed in claim 5, wherein said plurality of armature windings are connected in phases to permit voltages of different phases to be applied to said plurality of armature windings, and wherein a first phase to which current should initially be provided for starting the rotation of the motor is different depending on a position of a rotor of the motor.
Claim 13
Dependent Claim
138 words
In a brushless DC motor having a rotor which generates power, a method of generating the power, comprising the steps of: (a) generating a flux field using an annular field magnet having ten magnetic poles with surfaces alternately arranged in a ring-shaped form along a circumferential orientation, each having an opposing polarity with respect to adjacent magnetic poles, and (b) generating a magnetic field with respect to the flux field using an armature core having nine salient-poles and nine slots each formed between adjacent salient-poles, and having a plurality of armature windings wound around at least one of the salient-poles with at least one winding, wherein said generating step (b) further comprises the step of dividing the plurality of armature windings into three groups of windings wound around three consecutive of said nine salient-poles of said armature core.
Claim 14
Dependent Claim
138 words
In a brushless DC motor having a rotor which generates power, a method of generating the power, comprising the steps of: (a) generating a flux field using an annular field magnet having ten magnetic poles with surfaces alternately arranged in a ring-shaped form along a circumferential orientation, each having an opposing polarity with respect to adjacent magnetic poles, and (b) generating a magnetic field with respect to the flux field using an armature core having nine salient-poles and nine slots each formed between adjacent salient-poles, and having a plurality of armature windings wound around at least one of the salient-poles with at least one winding, wherein said generating step (b) further comprises the step of dividing the plurality of armature windings into three groups of windings wound around three consecutive of said nine salient-poles of said armature core.
Claim 15
Dependent Claim
41 words
A method as claimed in claim 9, wherein said generating step (b) further comprises the step of connecting the three groups of windings in three phases to permit voltages of different phases to be applied to the respective groups of windings.
Claim 16
Dependent Claim
30 words
A method as claimed in claim 9, wherein said generating step (b) further comprises the step of connecting the three groups of windings to form a three phase Y connection.
Claim 17
Dependent Claim
40 words
A method as claimed in claim 9, wherein said generating step (b) further comprises the step of connecting the plurality of armature windings in phases to permit voltages of different phases to be applied to said plurality of armature windings.
Claim 18
Dependent Claim
43 words
A method as claimed in claim 12, wherein said generating step (b) further comprises the step of connecting the plurality of armature windings in a first phase for starting the rotation of the rotor, the first phase dependent on an initial rotor position.
Claim 19
Dependent Claim
182 words
A brushless DC motor which generates power from the torque generated between a flux field and a rotating magnetic field, comprising: a flux generator generating the flux field, and including an annular field magnet having magnetic poles with surfaces alternately arranged in a ring-shaped form along a circumferential orientation, each having an opposing polarity with respect to adjacent magnetic poles; and a magnetic field generator generating the rotating magnetic field with respect to the flux field, and including an armature core having salient-poles and slots each formed between adjacent salient-poles, and having a plurality of armature windings wound around at least one of the salient-poles with at least one winding, said plurality of armature windings are divided into groups of windings wound around consecutive of said salient-poles of said armature core, and connected in three phases forming a three phase Y connection to permit voltages of different phases to be applied to the respective groups of windings, wherein said plurality of armature windings are divided into three groups of windings wound around three consecutive of said nine salient-poles of said armature core.
Claim 20
Dependent Claim
182 words
A brushless DC motor which generates power from the torque generated between a flux field and a rotating magnetic field, comprising: a flux generator generating the flux field, and including an annular field magnet having magnetic poles with surfaces alternately arranged in a ring-shaped form along a circumferential orientation, each having an opposing polarity with respect to adjacent magnetic poles; and a magnetic field generator generating the rotating magnetic field with respect to the flux field, and including an armature core having salient-poles and slots each formed between adjacent salient-poles, and having a plurality of armature windings wound around at least one of the salient-poles with at least one winding, said plurality of armature windings are divided into groups of windings wound around consecutive of said salient-poles of said armature core, and connected in three phases forming a three phase Y connection to permit voltages of different phases to be applied to the respective groups of windings, wherein said plurality of armature windings are divided into three groups of windings wound around three consecutive of said nine salient-poles of said armature core.
Claim 21
Dependent Claim
69 words
A method as claimed in claim 10, wherein said generating step (b) further comprises the steps of: detecting the position of said field magnet using a counter electromotive force waveform induced from each of said plurality of armature windings upon rotation of said motor; and commuting current flowing direction in said plurality of armature windings of each of said three phases whenever said field magnet rotates a 12° interval.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-09-07 | 2002-03-09 | 2002-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-07 | 2006-03-09 | 2006-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-07 | 2010-03-09 | 2010-09-08 | $7700.00 | Window Closed / Lapsed |