Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-06-28
2002-07-02
Waks, Joseph (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S215000, C029S596000
Reexamination Certificate
active
06414413
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a brushless DC motor employed with a refrigerant compressor or the like.
2. Description of Related Art
There is a prior art regarding a brushless DC motor that has been disclosed in Japanese Unexamined Patent Publication No. 8-237897.
As the same type of the brushless DC motor disclosed in the publication, there is one shown in
FIG. 6
that includes a sheet-like insulating constituent
51
, an iron core
52
, teeth
53
of the iron core, and a slot aperture
54
between teeth. The insulating constituent, which is formed by folding beforehand, is disposed at the slot or the slot aperture
54
, then a winding is provided on the insulating constituent to assemble the brushless DC motor.
If the winding is, for example, automatically wound by a machine around the iron core of the brushless DC motor as described above, insufficiently folded ends
55
of the insulating constituent
51
are positioned at a center of the slot aperture
54
causes a nozzle
60
for wrapping the winding to push the ends of the insulating constituent. This has been posing a danger of the insulating constituent to be dislocated or broken (refer to FIG.
6
B). The dislocated or broken insulating constituent has been leading to a likelihood of an insulation failure.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a brushless DC motor capable of improving productivity and minimizing chances of insulation failures.
To this end, according to one aspect of the present invention, there is provided a brushless DC motor having a winding directly provided on a tooth of a stator, comprising; a plate-like insulating constituent disposed at the tooth; and a slant portion provided on an end portion of the insulating constituent positioned between teeth such that the slant portion is inclined with respect to a central line between the teeth.
The insulating constituent is formed to be symmetrical with respect to the central line between the teeth.
A coil end or the coil end and an outgoing line are bound using a polyester thread.
A permanent magnet provided in a rotor of the brushless DC motor employs a rare earth material.
In a distal end portion of a tooth of a stator core of a concentrated winding type motor, a cut portion is formed on an inner-diameter tooth portion excluding a tooth body so that the cut portion extends as far as an aperture.
In the distal end portion of a tooth of the stator core of the concentrated winding type motor, the cut portion is provided on one side of the inner-diameter tooth portion excluding the tooth body so that the cut portion extends as far as the aperture.
In the distal end portion of a tooth of the stator core of the concentrated winding type motor, cut portions are provided on both sides of the inner-diameter tooth portion excluding the tooth body so that the cut portions extend as far as the aperture.
In the distal end portion of a tooth of the stator core of the concentrated winding type motor, a hole is provided in the vicinity of a slot aperture in a distal end portion excluding the tooth body.
In the distal end portion of a tooth of the stator core of the concentrated winding type motor, a groove is provided in the vicinity of a slot aperture in the distal end portion excluding the tooth body.
In the distal end portion of a tooth of the stator core of the concentrated winding type motor, a notch is provided so as to substantially increase a width of a gap between opposing tooth distal end portions.
The stator core of the concentrated winding type motor has a jig inserting hole for processing an outgoing line that is opened in an axial direction of the motor on an outer periphery side at a center of a stator tooth so that a relationship represented by H≧T/2 is established when a distance between a tooth and a corner at a slot bottom is denoted by H and a mean tooth width is denoted by T. An outgoing line of a drive coil is secured to a junction insert that is fixedly inserted in the jig inserting hole.
The stator core of the concentrated winding type motor has a jig inserting hole for processing an outgoing line that has been opened in an axial direction of the motor on an outer periphery side at a center of a stator tooth so that a relationship represented by H≧T/2 is established when a distance between a tooth and a corner at a slot bottom is denoted by H and a mean tooth width is denoted by T. An outgoing line of a drive coil is secured to a junction insert that is fixedly inserted in the jig inserting hole. The jig inserting holes and the junction inserts are provided on an arbitrary number of stator teeth.
The stator core of the concentrated winding type motor has: a jig inserting hole for processing an outgoing line that has been opened in an axial direction of the motor on an outer periphery side at a center of a stator tooth so that a relationship represented by H≧T/2 is established when a distance between a tooth and a corner at a slot bottom is denoted by H and a mean tooth width is denoted by T; and a resinous insulating jig fixedly inserted in the jig inserting hole. An inserting shaft of the junction insert has a device for preventing slippage in one direction, and an outgoing line of the drive coil is secured to a junction insert composed of an annular means for securing the outgoing line that has a cut in a part of its top portion.
A tooth distal end of the stator core of the concentrated winding type motor is constructed such that a distance T between a line A connecting right and left distal end points A and A′ of a tooth distal end portion of the stator core and a tangent B of an inner diameter of tooth is T≧0 (closer to an outer diameter of the stator).
In the stator of the concentrated winding type motor, a lead connection and a neutral point of the drive coil are buried in a slot by making use of a space of the slot of the stator core.
In the stator of the concentrated winding type motor, the lead connection and a neutral point of the drive coil is buried in the slot by making use of a space secured in the slot of the stator core for operating a needle of a winding nozzle when winding the drive coil.
In the stator of the concentrated winding type motor, the drive coil is wound with a spacer provided between an end surface of a stator tooth and the drive coil so as to reduce stress applied by the coil to slot insulating paper when winding the coil around a tooth of the stator core.
In the stator of the concentrated winding type motor, the drive coil is wound by providing a spacer, which allows a height H to secure an insulation distance, between the end surface of the stator tooth and the drive coil so as to reduce stress applied by the coil to the slot insulating paper when winding the coil around a tooth of the stator core.
In the stator of the concentrated winding type motor, the drive coil is wound by providing a spacer, which has a shape matching a desired shape of a coil end, between the end surface of the stator tooth and the drive coil so as to reduce stress applied by the coil to the slot insulating paper when winding the coil around a tooth of the stator core.
In the stator of the concentrated winding type motor, plate-like slot insulating paper of 0.2 mm to 0.5 mm is disposed on an inner edge of the slot of the stator core, and a portion of the insulating paper that projects from an end surface of the stator is folded a plural number of times toward a tooth of the stator and welded by heating.
In the stator of the concentrated winding type motor, plate-like slot insulating paper of 0.2 mm to 0.5 mm is disposed on an inner edge of the slot of the stator core, and a portion of the insulating paper that projects from an end surface of the stator is folded toward a tooth of the stator, and a reinforcing insulator is provided between the end surface of the stator and the insulating paper.
In the stator of the concentrated winding type motor, the stator core is provided with a skew that is 7.5±5 degr
Arai Kazuhiko
Igarashi Keijiro
Takezawa Masaaki
Darby & Darby
Sanyo Electric. Co,. Ltd.
Waks Joseph
LandOfFree
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