Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2002-01-15
2004-08-03
Tugbang, A. Dexter (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S524100, C029S525060, C029S598000, C029S609000, C029S736000, C310S216006, C310S216055, C310S166000, C310S168000
Reexamination Certificate
active
06769167
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotor for a synchronous reluctance motor and a manufacturing method thereof, and particularly, to a rotor for a synchronous reluctance motor of flux barrier type and a manufacturing method.
2. Description of the Background Art
A synchronous reluctance motor is a kind of synchronous motor, and it has relatively low price, and high efficiency and responsiveness, however, it has a complex structure and it is hard to be manufactured, whereby it takes a lot of costs and times. Therefore, it is not mass-produced nowadays.
The synchronous reluctance motor as described above comprises a stator and a rotor formed by insulatingly stacking a plurality of steel plates. Herein, the stator is nearly similar to a general stator in an induction motor, and the rotor includes a rotor core on which a plurality of flux barriers are formed in order to generate difference between a magnetic resistance.
FIG. 1
is a view showing a rotor core in the synchronous reluctance motor of flux barrier type according to the conventional art.
As shown therein, the conventional rotor core is made by a plurality of magnetic core steel plates
111
formed as circular plates, which are stacked along with a rotation shaft line direction so as to be insulated with each other, and a shaft hole
112
is formed at a center part of the respective core steel plates
111
so as to receive a rotational shaft. A plurality of bolt holes
113
are formed on boundary part of the shaft hole
112
so as to receive a fixing bolt (not shown) which couples and fixes the stacked respective core steel plates
111
integrally in the shaft line direction.
On the other hand, a plurality of magnetic pole portions P
1
~P
4
are formed on boundary part of the respective core steel plates
111
, and a plurality of flux barrier groups B
1
~B
4
are formed between the respective magnetic pole portions P
1
~P
4
so as to generate a difference between the magnetic resistance.
The respective flux barrier group B
1
~B
4
includes a plurality of flux barriers
115
which are formed as penetrating the plate surface so that both ends are abutting on a circumference and a center part has an arc shape protruded toward the shaft hole
112
, and disposed alternatively with magnetic paths
117
in radial direction of the core steel plates
111
. A plurality of lugs
119
, which are depressed from one plate surface and protruded toward the other plate surface, and therefore inserted into the depressed parts of the another lug
119
when the plates are stacked, are formed on the magnetic paths
117
between the respective flux barriers
115
.
However, according to the rotor of the conventional flux barrier type synchronous reluctance motor, many flux barriers
115
and lugs
119
are formed on the core steel plate
111
, and therefore, a strength of the motor is weak so that a distortion may be generated, a phenomenon that the core steel plates
111
are separated from each other at their edges may be generated, and it took much time and cost to assemble so that the manufacturing cost is increased.
Especially, the flux barrier type synchronous reluctance motor is now experimentally manufactured, and can not be mass-produced and utilized.
Also, the rotor of the conventional synchronous reluctance motor can not be applied to a skew type rotor in which the flux barrier is disposed to have a predetermined skew for the rotational shaft due to arranging structure of the lugs
119
and shapes of the flux barriers
115
.
On the other hand,
FIG. 2
is a view showing an another example of the rotor core in the conventional flux barrier type synchronous reluctance motor. As shown therein, a rotor core
120
is made by stacking a plurality of circular plate members
121
including a plurality of holes
122
of arc shapes formed on boundary.
The respective circular plate member
121
is made using one of a magnetic member or non-magnetic member. In case that the circular plate member is made using the magnetic member, the flux barrier is formed by filling a nonmagnetic filling member
123
into the hole
122
of arc shape after stacking the plates. In addition, in case that the circular plate member is made using the nonmagnetic member, a magnetic filling member
123
is filled in the hole
122
after stacking the plates to form a magnetic pole part, whereby the rotation power is generated by the difference of the magnetic resistance.
However, according to the rotor of the conventional flux barrier type synchronous reluctance motor described above, the circular plate members
121
is stacked, after that, the filling member
123
is filled into the holes
122
, and a boundary part
124
is removed by machining after the filling is completed. Therefore, an additional filling device for filling the filling member
123
and an additional device for fabricating the boundary part, and also, it takes much time to manufacture the product and the manufacturing cost is increased.
Also, the rotor of the conventional flux barrier type synchronous reluctance motor is difficult to be applied to the rotor of skew type due to the structure of the hole
122
which is formed as an arc.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a rotor for a synchronous reluctance motor and a manufacturing method which can be easily manufactured, is able to reduce manufacturing cost, and suitable for mass producing by automatically stacking core steel plates regardless of skew type or non skew type.
To achieve the object of the present invention, as embodied and broadly described herein, there is provided a rotor for a synchronous reluctance motor according to the present invention comprising: a plate stacked body made by stacking a plurality of magnetic core steel plates on which a shaft hole is formed at center part and a plurality of flux barrier groups are formed around the shaft hole; end plates which are disposed on both sides of the plate stacked body; a coupling means penetrating the flux barrier groups and coupling the plate stacked body and the end plates as a single body; and a rotational shaft which is inserted into the plate stacked body and the end plates.
The flux barrier group includes a plurality of flux barriers having both end parts abutting on an outer circumference of the core steel plate and a center part of arc shape hole protruded toward the shaft hole.
The flux barriers are formed so that widths of the holes are gradually increased from the outer circumference to the shaft hole along with the radial direction of the core steel plate, and the widths of the holes are gradually reduced toward both ends. In addition, the respective flux barrier includes a straight line part at their center part.
Four flux barrier groups are formed so as to be symmetric with each other, and the respective flux barrier group includes three flux barriers.
The coupling means passes through a flux barrier which is located in the middle of the three flux barriers.
In addition, the coupling means includes a rivet which passes through at least one flux barrier among those the plurality of flux barriers in the plate stacked body from the end plate on one side and is exposed as passing through the end plate on the other side.
Herein, the coupling means may include a fixing bolt which penetrates at least one flux barrier among those plurality of flux barriers in the plate stacked body from the end plate on one side and is exposed to the end plate on the other side, and a nut which is coupled to the exposed end of the fixing bolt using a screw.
An automatic stacking point which is coupled to the other when the plates are stacked is formed on the core steel plate, and the automatic stacking point is protruded from one surface of the core steel plate to the other surface. The automatic stacking point is protruded as a square shape.
The automatic stacking point may be formed on boundary part of the shaft hole, or may be formed on an outer circumference of the core steel plate between
Cheong Dal Ho
Lee Kyung Hun
Oh Jae Yoon
Fleshner & Kim LLP
Kim Paul D
LG Electronics Inc.
Tugbang A. Dexter
LandOfFree
Method of manufacturing a rotor for a synchronous reluctance... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of manufacturing a rotor for a synchronous reluctance..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of manufacturing a rotor for a synchronous reluctance... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3353047