Canadian Patents Database / Patent 2790300 Summary

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(12) Patent: (11) CA 2790300
(54) English Title: SWITCHED RELUCTANCE MOTOR
(54) French Title: MOTEUR A RELUCTANCE COMMUTEE
(51) International Patent Classification (IPC):
  • H02K 1/06 (2006.01)
  • H02K 29/00 (2006.01)
(72) Inventors (Country):
  • YUAN, DEFANG (Canada)
(73) Owners (Country):
  • YUAN, DEFANG (Canada)
(71) Applicants (Country):
  • YUAN, DEFANG (Canada)
(74) Agent: GOWLING WLG (CANADA) LLP
(45) Issued: 2014-05-20
(22) Filed Date: 2012-09-25
(41) Open to Public Inspection: 2012-12-25
Examination requested: 2012-09-25
(30) Availability of licence: N/A
(30) Language of filing: English

English Abstract

A switched reluctance motor (SRM) with a rotor shaft defining a rotational axis, a rotor disc extending radially from the rotor shaft, the rotor disc has rotor poles spaced equally circumferentially. The SRM also has a stator arrangement with a plurality of member stators. The member stators are spaced equally circumferentially and aligned in a common plane perpendicular to the rotational axis and axially spaced from the rotor disc for forming an axial air gap. Each of the member stators has a stator coil providing a magnetic flux in the axial air gap when energized. Every second member stator of the plurality of member stators forms a respective group, resulting in a first group and a second group of member stators, so that each member stator of the first group is surrounded by two members of the second group on each side. The SRM also has a control circuitry comprising a half-wave rectifier arrangement in a forward direction and a half-wave rectifier arrangement in a reverse direction; the stator coils in the first group are connected to the half-wave rectifier arrangement in the forward direction and the stator coils in the second group are connected to the half- wave rectifier arrangement in the reverse direction. Both the stator arrangement and the rotor disc may be offset by an index angle.


French Abstract

Moteur à reluctance commutée avec arbre rotor définissant un axe de rotation et disque rotor s'étendant de manière radiale par rapport à l'arbre rotor. Le disque rotor est doté de pôles espacés de manière égale et circonférentielle. Le moteur à reluctance commutée comporte aussi un assemblage de stator avec une multitude d'éléments de stator. Les éléments de stator sont espacés de manière égale et circonférentielle et alignés sur un plan commun perpendiculaire à l'axe de rotation et espacés de manière axiale par rapport au disque rotor pour former une fente d'aération axiale. Chaque élément de stator comporte une bobine de stator fournissant un flux magnétique par la fente d'aération axiale lorsqu'il est sous tension. Chaque deuxième élément de stator parmi la multitude d'éléments de stator forme un groupe respectif ce qui produit un premier groupe et un second groupe d'éléments de stator. Chaque élément du premier groupe est entouré de deux éléments du deuxième groupe de chaque côté. Le moteur à reluctance commutée comporte aussi un circuit de contrôle comprenant un ensemble redresseur demi-onde en direction avant et un ensemble redresseur demi-onde en sens inverse. Les bobines de stator du premier groupe sont reliées à l'ensemble redresseur demi-onde en direction avant et les bobines de stator du deuxième groupe sont reliées à l'ensemble redresseur demi-onde en sens inverse. Les deux assemblages de stator et le disque rotor peuvent être décalés en fonction d'un angle d'indexation.


Note: Claims are shown in the official language in which they were submitted.




What is claimed is:


1. A switched reluctance motor comprising:
a rotor shaft defining a rotational axis;

a rotor disc extending radially from the rotor shaft, the rotor disc having a
first
plurality of rotor poles spaced equally circumferentially;

a stator arrangement having a second plurality of member stators; the second
plurality of member stators spaced equally circumferentially; the member
stators
aligned in a common plane perpendicular to the rotational axis and axially
spaced
from the rotor disc for forming an axial air gap; each of the member stators
having
a stator coil providing a magnetic flux in the axial air gap when energized,
the
magnetic flux in the axial air gap being parallel to the rotational axis;
every
second member stator of the second plurality of member stators forming a
respective group, resulting in a first group and a second group of member
stators,
and each member stator of the first group is surrounded by two members of the
second group on each side; and

a control circuitry comprising a half-wave rectifier arrangement in a forward
direction
and a half-wave rectifier arrangement in a reverse direction;

wherein the stator coils in the first group are connected to the half-wave
rectifier
arrangement in the forward direction and the stator coils in the second group
are
connected to the half-wave rectifier arrangement in the reverse direction.


2. The switched reluctance motor of claim 1, wherein the rotor disc is a first
rotor disc
and the stator arrangement is a first stator arrangement, further comprising:



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a second rotor disc and a third rotor disc, each extending radially from the
rotor
shaft, the second rotor disc and the third rotor disc having the first
plurality of rotor
poles spaced equally circumferentially; and

a second stator arrangement and a third stator arrangement, each having an
identical configuration as the first stator arrangement;

wherein the control circuitry further comprises two half- wave rectifier
arrangements
in a forward direction and two half-wave rectifier arrangements in a reverse
direction;

wherein the stator coils in each of the first groups are connected to the half-
wave
rectifier arrangement in the forward direction and the stator coils in each of
the
second groups are connected to the half-wave rectifier arrangement in the
reverse direction; and

wherein two adjacent member stators define a stator sector angle and two
adjacent
rotor poles define a rotor sector angle.


3. The switched reluctance motor of claim 2, wherein the second rotor disc is
indexed
relative to the first rotor disc, and the third rotor disc is indexed relative
to the
second rotor disc.


4. The switched reluctance motor of claim 2, wherein the second stator
arrangement
is indexed relative to the first stator arrangement, and the third stator
arrangement
is indexed relative to the second stator arrangement.


5. The switched reluctance motor of claim 2, wherein the second rotor disc is
indexed
by a third of the rotor sector angle relative to the first rotor disc, and the
third rotor
disc is indexed by a third of the rotor sector angle relative to the second
rotor disc.


6. The switched reluctance motor of claim 2, wherein the second stator
arrangement
is indexed by a third of the rotor sector angle relative to the first stator


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arrangement, and the third stator arrangement is indexed by a third of the
rotor
sector angle relative to the second stator arrangement.


7. The switched reluctance motor of claim 2, wherein the second rotor disc is
indexed
one sixth of the rotor sector angle relative to the first rotor disc, and the
third rotor
disc is indexed one sixth of the rotor sector angle to the second rotor disc.


8. The switched reluctance motor of claim 2, wherein the second stator
arrangement is
indexed one sixth of the rotor sector angle relative to the first stator
arrangement,
and the third stator arrangement is indexed one sixth of the rotor sector
angle to
the second stator arrangement.


9. The switched reluctance motor of claim 1, wherein the first plurality is
half of the
second plurality.


10. The switched reluctance motor of claim 1, wherein each of the member
stators has
a C-shaped core and wherein a back portion of the C-shaped core forms an air
gap.


11. The switched reluctance motor of claim 1, wherein the rotor pole is made
from
material selected from the group consisting of iron, steel including
electrical steel
and silicon steel, ferrite, amorphous magnetic, and perm alloy.


12. The switched reluctance motor of claim 1, wherein the rotor disc is made
from
material selected from the group consisting of aluminum, titanium, steels,
iron,
plastics including fiber-reinforced plastics, and ceramic.


13. The switched reluctance motor of claim 1, wherein the stator coils of the
member
stators in one of the first and second groups are connected in series or in
parallel.

14. The switched reluctance motor of claim 2, wherein the switched reluctance
motor
is powered by a three-phase AC.



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15. A switched reluctance motor comprising:
a rotor shaft defining a rotational axis;

a rotor disc ring connected to the rotor shaft, the rotor disc ring having a
first plurality
of rotor poles spaced equally circumferentially;

a stator arrangement having a second plurality of member stators; the second
plurality of member stators spaced equally circumferentially; the member
stators
aligned in a common plane perpendicular to the rotational axis and axially
spaced
from an in side of the rotor disc ring for forming an axial air gap; each of
the
member stators having a stator coil providing a magnetic flux in the axial air
gap
when energized, the magnetic flux in the axial air gap being parallel to the
rotational axis; every second member stator of the second plurality of member
stators forming a respective group, resulting in a first group and a second
group
of member stators, and each member stator of the first group is surrounded by
two members of the second group on each side; and

a control circuitry comprising a half-wave rectifier arrangement in a forward
direction
and a half-wave rectifier arrangement in a reverse direction;

wherein the stator coils in the first group are connected to the half-wave
rectifier
arrangement in the forward direction and the stator coils in the second group
are
connected to the half-wave rectifier arrangement in the reverse direction.


16. The switched reluctance motor of claim 15, wherein each of the member
stators
has a C-shaped core and wherein a back portion of the C-shaped core forms an
air gap.


17. A method for generating torque by a switched reluctance motor, the method
comprising:

defining a rotational axis in a rotor shaft of the switched reluctance motor;


28




arranging a rotor disc with the rotor shaft, the rotor disc extending radially
from the
rotor shaft;

inserting a first plurality of rotor poles spaced equally circumferentially
into the rotor
disc;

arranging equally circumferentially a second plurality of member stators; the
second
plurality of member stators spaced;

aligning the member stators in a common plane perpendicular to the rotational
axis
and axially spaced from the rotor disc for forming an axial air gap; each of
the
member stators having a stator coil;

grouping every second member stator of the second plurality of member stators
to
form a first group and a second group of member stators, and each member
stator of the first group is surrounded by two members of the second group on
each side; and

providing a control circuitry comprising a half- wave rectifier arrangement in
a
forward direction and a half-wave rectifier arrangement in a reverse
direction,
connecting the stator coils in the first group to the half-wave rectifier
arrangement in
the forward direction;

connecting the stator coils in the second group to the half-wave rectifier
arrangement in the reverse direction; and

energizing the control circuitry and the stator coil to provide a magnetic
flux in the
axial air gap, the magnetic flux in the axial air gap being parallel to the
rotational
axis.



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18. The method of claim 17, further comprising:

arranging a second rotor disc and a third rotor disc, each extending radially
from the
rotor shaft;

inserting a first plurality of rotor poles spaced equally circumferentially
into the
second rotor disc and the third rotor disc; and

arranging a second stator arrangement and a third stator arrangement, each
have
an identical configuration as the first stator arrangement;

wherein the control circuitry further comprises two half- wave rectifier
arrangements
in a forward direction and two half-wave rectifier arrangements in a reverse
direction;

wherein the stator coils in each of the first groups are connected to the half-
wave
rectifier arrangement in the forward direction and the stator coils in each of
the
second groups are connected to the half-wave rectifier arrangement in the
reverse direction.


19. The method of claim 18, wherein the second stator arrangement is indexed
relative to the first stator arrangement, and the third stator arrangement is
indexed
relative to the second stator arrangement.


20. The method of claim 18, wherein the second rotor disc is indexed by a
third of the
rotor sector angle relative to the first rotor disc, and the third rotor disc
is indexed
by a third of the rotor sector angle relative to the second rotor disc.



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Admin Status

Title Date
(22) Filed 2012-09-25
Examination Requested 2012-09-25
(41) Open to Public Inspection 2012-12-25
(45) Issued 2014-05-20
Lapsed 2017-09-25

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Request for Examination $400.00 2012-09-25
Filing $200.00 2012-09-25
Final $150.00 2014-03-04
Maintenance Fee - Patent - New Act 2 2014-09-25 $50.00 2014-09-12
Maintenance Fee - Patent - New Act 3 2015-09-25 $50.00 2015-07-29

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Document
Description
Date
(yyyy-mm-dd)
Number of pages Size of Image (KB)
Cover Page 2012-12-28 1 38
Abstract 2012-09-25 1 32
Description 2012-09-25 24 1,180
Claims 2012-09-25 6 226
Drawings 2012-09-25 3 39
Drawings 2014-01-27 10 353
Cover Page 2014-04-29 1 38
Correspondence 2012-10-25 1 34
Correspondence 2012-10-30 1 13
Prosecution-Amendment 2012-10-18 1 24
Prosecution-Amendment 2013-01-17 1 18
Prosecution-Amendment 2014-01-07 2 58
Prosecution-Amendment 2014-01-27 14 456
Correspondence 2014-03-04 2 47
Fees 2014-09-12 1 33