Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2000-09-14
2003-04-01
Walberg, Teresa (Department: 3742)
Pumps
Motor driven
Electric or magnetic motor
Reexamination Certificate
active
06540489
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to motor driven compressors incorporated in air conditioning systems.
2. Description of Related Art
Known motor driven compressors include a compressing mechanism and a motor, which includes a rotary shaft, which are located within a housing. The rotary shaft drives the compressing mechanism within the housing. In such motor driven compressors, a stator and a rotor, comprising the motor, may be positioned within the housing. An offset of phase between the stator and the rotor is set, and the rotor then is magnetized.
FIG. #
8
depicts a partial cross-sectional view of a known motor driven compressor, as described in Japanese Patent Application Publication No. 09-45530.
Referring to FIG. #
8
, the motor driven compressor includes a;,direct current motor
102
and compressing mechanism (not shown), which is connected to direct current motor
102
via a rotary shaft
103
within a housing
101
. Direct current motor
102
includes stator
104
and rotor
105
. Stator
104
is fixed within housing
101
, and rotor
105
is mounted on rotary shaft
103
. Rotary shaft
103
is rotatably supported by bearing
120
. Suction port
109
is formed within housing
101
. A mark
108
, such as crossing groove, is formed on a first end surface of rotary shaft
103
. Housing
101
has a hole
106
, which is positioned opposite a second end of rotary shaft
103
. Hole
106
is closed by a sealing bolt
107
.
In such known motor driven compressors, after direct current motor
102
, rotary shaft
103
, and compressing mechanism (not shown) are positioned within housing
101
, the offset of phase between stator
104
and rotor
105
is set using a jig (not shown), such as a positioning member. Specifically, from outside housing
101
, the jig (not shown) engages with mark
108
through hole
106
. Subsequently, the jig is rotated around its axis to rotate rotary shaft
103
and rotor
105
. Thereby, the phase offset between stator
104
and rotor
105
is set. Once in position, rotor
102
is magnetized. Finally, after magnetization, hole
106
is closed by sealing bolt
107
. Magnetization occurs when current is provided to stator
104
via an electrical wire (not shown), which causes a magnetic force generated in stator
104
to act upon rotor
105
.
In the known motor driven compressor described above, after magnetization, hole
106
of housing
101
is closed by sealing bolt
107
. This configuration complicates such compressor's structure by increasing the number of parts.
FIG. #
9
depicts a partial cross-sectional view of another known motor driven compressor, as also described in Japanese Patent Application Publication No. 09-45530.
A mark
118
is formed on a first end surface of rotor
105
of direct current motor
102
. Suction port
109
is formed within housing
101
. Suction port
109
is positioned opposite mark
118
. In this known motor driven compressor, after direct current motor
102
and compressing mechanism are installed and enclosed within housing
101
, a jig (not shown) is inserted inside housing
101
through suction port
109
. Subsequently, rotor
105
is rotated to offset the phase between stator
105
and rotor
104
, so as to position mark
118
of rotor
105
opposite suction port
109
. Finally, once mark
118
is in position, rotor
105
is magnetized.
In the known motor driven compressor described above, rotor
105
is machined with a mark, such as a hole. Therefore, this compressor has increased manufacturing costs and during machining, it is difficult to maintain the angle between rotor
105
and rotary shaft
103
.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a motor driven compressor of structure, which allows the rotor to be readily magnetized, and which may reliably set the offset of phase between the rotor and stator for magnetizing the rotor.
It is an another object of the present invention to decrease the number of parts and to provide a motor driven compressor, in which the rotor need not be machined with a mark.
According to an embodiment of the present invention, a motor driven compressor has a motor and a compressing mechanism connected to the motor through a rotary shaft, which are located within a housing, and an offset of phase is set between a stator and a rotor. The rotor is mounted on the rotary shaft, which allows the rotor to rotate, so that it may be magnetized. Further, according to this embodiment, the housing of the motor driven compressor has a communication gas hole, which extends from a suction port to a discharge hole. Additionally, according to this embodiment, the motor driven compressor has a driving member driven together with the rotary shaft, and a mark positioned along a radial axis on a first end surface of the driving member. The mark is used for setting the offset of phase between the stator and the rotor on the basis of the mark, by positioning the mark opposite the suction port.
According to another embodiment of the present invention, a rotor in a motor driven compressor is magnetized by connecting a compressing mechanism to the motor through a rotary shaft, which are located within a housing, and setting the offset of phase between a stator of the motor and the rotor, where the rotor is mounted to a rotary shaft, allowing the rotor to rotate, so that it may be magnetized. Additionally, according to this embodiment, a driving member is driven together with the rotary shaft, and a mark is positioned along a radial axis on a first end surface of the driving for setting the offset of phase between the stator and the rotor on the basis of the mark, by positioning the mark opposite the suction port.
Other objects, features, and advantages will be apparent to persons of ordinary skill in the art in view of the following detailed description of the invention and the accompanying drawings.
REFERENCES:
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patent: 6315528 (2001-11-01), Williams et al.
patent: 9-045530 (1997-02-01), None
Patel Vinod D
Sanden Corporation
Walberg Teresa
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