Support assembly for magnetic field coils for protruding pole rotors.

Abstract

DEPCT63 The coil support (28) is designed to include the coil support body (281), which It is made with resin and converging surfaces (281c, 281d) that will converge directly with, respectively, The inner surface along the radius of the adjacent magnetic field coil (24) and the insertion hole (281a) which have been Formed in the radial direction of the rotary shaft (21), the bolt (282) has a hexagonal hole with an end. The base is fixed to the rotor yoke (22) and the tip extends outward in the vertical direction. The radius is inserted into the insertion hole (281a) of the coil support body (281) and disc spring (283). It is inserted between the rotor yoke (22) and the coil support body (281) and presses the body. It supports the coil (281) to the magnetic field coil (24) and will have a dot surface section (281b) which is received Radial formation on the outside of the insert hole (281a) that will have a diameter larger than the insert hole. (281a) -----------------------------------------------------------

Description

Field winding support member for salient pole rotor

[0001] The present invention relates to a field winding support member for a salient pole rotor.

[0002] In the past, in salient-pole rotating electric machines, it has been known to support the field winding of the rotor of a salient-pole rotating electric machine with a lift-up device in order to prevent malfunctions caused by the insulation between each layer of the rotor's field winding shrinking over time (see, for example, Patent Documents 1 and 2 listed below).

[0003] Such a push-up device has a structure in which insulating plates such as high-strength phenolic plates, bakelite plates, glass epoxy laminated plates, etc. are arranged on the underside of the field winding, and the field winding is supported by pressing the field winding radially outward via these insulating plates.

[0004] Japanese Utility Model Application Laid-Open No. 3-77251 Japanese Utility Model Application Laid-Open No. 61-126757

[0005] However, when an insulating plate is placed on the underside of the field winding, this insulating material acts as a heat insulator, which may hinder ventilation cooling and lead to heat generation in the coil.

[0006] Therefore, it is conceivable to do away with the insulating plate, and instead use an insulating material for the portion of the push-up device that comes into contact with the rotor field winding, so that the field winding is directly supported by the push-up device.

[0007] Meanwhile, according to standards such as IEC 60664-1, rotor field windings are generally driven at an effective voltage of 630 V or less, which is equivalent to that of a low-voltage rotating machine, and the minimum creepage distance recommended is 10 mm, although this varies depending on the material and the degree of surface contamination of the insulator. Therefore, the creepage distance for the rotor field winding is usually secured by adding a safety factor to this minimum creepage distance.

[0008] In view of the above, an object of the present invention is to provide a field winding support member for a salient pole rotor that can support the rotor field winding while ensuring the desired insulation creepage distance, even when the insulating plate on the underside of the rotor field winding is eliminated.

[0009] A first aspect of the present invention for solving the above problems provides a field winding support member for a salient pole rotor, the field winding support member for a salient pole rotor having a rotor core, comprising a rotor yoke, magnetic pole protrusions, and magnetic pole heads, mounted on a rotating shaft, with field windings arranged on the circumferential surfaces of the magnetic pole protrusions, and which presses circumferentially adjacent field windings radially outward, the field winding support member comprising: a coil support main body portion made of an insulating material and provided with abutment surfaces that directly abut the radially inner surfaces of adjacent field windings, respectively, and an insertion hole formed along the radial direction of the rotating shaft; a bolt having a base end fixed to the rotor yoke and a tip end that protrudes radially outward and is inserted into the insertion hole of the coil support main body portion; and an elastic body interposed between the rotor yoke and the coil support main body portion and pressing the coil support main body portion toward the field winding side, The coil support main body has a counterbore formed with a diameter larger than that of the insertion hole at a portion radially outward of the insertion hole in the direction of the rotation shaft.

[0010] In addition, a field winding support member for a salient pole rotor according to a second invention for solving the above-mentioned problems is characterized in that the insulating material is a resin.

[0011] According to the field winding support member for a salient pole rotor of the present invention, even if the insulating plate on the underside of the rotor field winding is eliminated, the rotor field winding can be supported while ensuring the desired insulation creepage distance.

[0012] Fig. 3 is a schematic diagram showing the configuration of a salient-pole rotating electric machine. Fig. 4 is a front view of a field winding support member for a salient-pole rotor according to an embodiment of the present invention. Fig. 5 is a cross-sectional view of the coil support main body shown in Fig. 2. Fig. 6 is a top view of the coil support main body shown in Fig. 2. Fig. 7 is an explanatory diagram showing a creepage distance when a field winding support member for a salient-pole rotor according to an embodiment of the present invention is applied. Fig. 8 is an explanatory diagram showing a creepage distance when the coil support main body does not have a counterbore portion.

[0013] Hereinafter, a field winding support member for a salient pole rotor according to the present invention will be described with reference to the drawings.

[0014] 1 to 6, the insulating plate of a salient pole rotor according to one embodiment of the present invention will be described in detail.

[0015] As shown in FIG. 1, the salient-pole rotating electric machine 1 has a substantially cylindrical stator 10 fixed to a frame or the like (not shown), and a salient-pole rotor 20 rotatably held on the inner periphery of the stator 10.

[0016] The rotating shaft 21, rotor yoke 22, and magnetic pole projections 23 of the salient pole rotor 20 are integrally formed, for example, by cutting and molding from a block of magnetic material. The rotating shaft 21 serves as the center of rotation of the salient pole rotor 20, and both axial ends thereof are rotatably supported by bearings (not shown). The rotor yoke 22 is integrally formed at the axial center of the rotating shaft 21, extending axially while surrounding the rotating shaft 21. The magnetic pole projections 23 are integrally formed at positions 90° offset from the outer periphery of the rotor yoke 22 in the circumferential direction. In other words, the magnetic pole projections 23 protrude radially outward from the outer periphery of the rotor yoke 22 and are arranged at equal intervals in the circumferential direction.

[0017] A field winding (field coil) 24 is arranged on the circumferential surface of the magnetic pole protrusion 23 via an insulating plate (not shown). The field winding 24 is formed by laminating plate-shaped conductors and plate-shaped insulating members alternately in the radial direction.

[0018] A pole head 25 is fixed to the top surface (radially outer end surface) of the pole protrusion 23 with a plurality of bolts (not shown). A gap (a gap of several mm in the radial direction) is secured between the outer peripheral surface of the pole head 25 and the inner peripheral surface of the stator 10. The pole protrusion 23 and the pole head 25 form a pole core. The rotor yoke 22, the pole protrusion 23, and the pole head 25 also form a rotor core.

[0019] An insulating plate 27 is provided between the top surface (radially outer end surface) of the field winding 24 and the inner peripheral side surface (radially inner end surface) of the pole head 25 .

[0020] In this embodiment, a coil support (field winding support member) 28 is disposed between two circumferentially adjacent field windings 24, directly contacting the inner peripheral surface side (radially inner end surface) of the field windings 24 and pushing up the field windings 24.

[0021] 2, the coil support 28 includes a coil support main body 281 made of resin (insulating material), a hexagon socket head cap bolt 282 whose tip end is inserted into an insertion hole 281a (see FIG. 3) provided in the coil support main body 281 and whose base end is fixed to the rotor yoke 22, and a disc spring (elastic body) 283 that passes through the hexagon socket head cap bolt 282 and is interposed between the rotor yoke 22 and the coil support main body 281. In this embodiment, the disc spring 283 is supported by a washer 284 interposed between the coil support main body 281 and the coil support main body 281, and a spool retainer 285 interposed between the rotor yoke 22.

[0022] As shown in Figures 3 and 4, the coil support main body 281 is formed in a generally trapezoidal shape when viewed from the side, and the surfaces corresponding to its legs are contact surfaces 281c, 281d that respectively contact the radially inner surfaces of the field windings 24 that are adjacent in the circumferential direction.

[0023] The above-mentioned insertion hole 281a is provided in the center of the coil support main body 281 along the radial direction of the rotary shaft 21. A counterbore portion 281b formed with a larger diameter than the insertion hole 281a is provided on the upper bottom side of the insertion hole 281a (outside in the radial direction of the rotary shaft 21). In this embodiment, the insertion hole 281a is an elongated hole so as to be able to absorb manufacturing errors in the field winding 24, etc., as shown in FIG. 4. Accordingly, the counterbore portion 281b is also an elongated hole.

[0024] In the field winding support member of the salient pole rotor according to this embodiment configured as described above, by providing the counterbore portions 281b, even if the hexagon socket head cap bolts 282 abut against the ends of the insertion holes 281a of the coil support main body 281 due to manufacturing errors in the field winding 24 or the like as shown in FIG. 5, it is possible to ensure a sufficient creepage distance between the field winding 24 and the hexagon socket head cap bolts 282, as shown by the thick line in FIG. 5.

[0025] That is, if the insulating plate on the underside of the field winding 24 is eliminated without providing the counterbore portion 281b, when the hexagon socket head cap bolt 282 abuts against the end of the insertion hole 281a of the coil support main body 281, as in the coil support 28' shown in Figure 6, it becomes difficult to ensure a sufficient creepage distance from the field winding 24 to the hexagon socket head cap bolt 282, as shown by the thick line in Figure 6. In contrast, if the field winding support member for the salient-pole rotor according to this embodiment is used, the desired insulation creepage distance can be ensured as described above, even if the insulating plate on the underside of the field winding 24 is eliminated.

[0026] REFERENCE SIGNS LIST 1 salient pole rotating electric machine 10 stator 20 salient pole rotor 21 rotating shaft 22 rotor yoke 23 magnetic pole salient portion 24 field winding 25 magnetic pole head 25a outer circumferential surface 27 insulating plate 28, 28' coil support 281 coil support main body 281a insertion hole 281b counterbore portion 281c, 281d abutment surface 282 hexagon socket head bolt 283 disc spring 284 washer 285 spool retainer

Claims

DEPCT631. Magnetic field coil support assembly for cantilever rotors. Cantilever rotors are constructed in such a way that the rotor shaft is mounted on a rotor core which incorporates the rotor yoke, magnetic pole protrusions and magnetic pole heads, and magnetic field coils arranged on the circular surfaces of each magnetic pole protrusion. The magnetic field coil support assembly for cantilever rotors presses adjacent magnetic field coils outward in the radial direction. The magnetic field coil support assembly for cantilever rotors is characterized by its assembly consisting of: a coil support body made of electrically insulating material and provided with a joining surface that directly meets, respectively, the inner radial surface of the adjacent magnetic field coils and with an insertion hole formed in the radial direction of the rotary shaft; a bolt with a base end that is fixed to the rotor yoke and a peak end that protrudes outward in the radial direction. The peak end is inserted into the insertion hole of the coil support body;and a flexible body which is inserted between the rotor yoke and the coil support body and presses the coil support body against the field windings where the coil support body is formed on the outer side of the insertion hole in the radial direction of the rotary shaft with a point surface with a diameter larger than the insertion hole.

2. Field winding support assembly for a protruding pole rotor as specified in claim 1, which is characterized by the electrical insulation material being resin.