JP2017200354A - Brushless rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure cooling performance of an exciting device while suppressing influence on the arrangement around a rotary rectifier in a brushless rotary electric machine.SOLUTION: A brushless rotary electric machine includes: a rotor having a rotor shaft 11 and a rotor core; a stator having a stator core and a stator coil; an exciting device 100 having a rotary rectifier 110 which rotates with the rotor shaft 11; a frame; and an exciting device cover. The exciting device 100 has: a support member 115 which supports the rotary rectifier 110, is attached to a radial periphery of the rotor shaft 11, and has a discoid shape; and agitation blades 118 which are attached to the support member 115, extend in a radial direction and a rotary shaft direction, and agitate a circulation gas in the exciting device cover 61.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a brushless rotating electrical machine having a rotary rectifier.

  In a synchronous rotating electric machine, an armature winding is usually provided on the stator side and a field winding is provided on the rotor side. The DC power to the field winding provided in the rotor is usually supplied from a rectifier provided on the stationary side via a brush. Since this brush requires maintenance and replacement, there is known a method of making the brushless by providing a rotary rectifier that rotates together with the rotor in order to eliminate the need for the brush.

Japanese Utility Model Publication No. 63-156559 Japanese Patent Publication No. 3-20982 JP-A-5-300700 JP 2010-98789 A

  In particular, in mobile rotating electrical machines such as mobile pack generators, there are particularly severe limitations such as weight limitations and the need to shorten the axial length to the limit. For this reason, it is often difficult to employ a conventional method in which the exciter and the main body are connected by a duct and the cooling gas cooled by the cooler is circulated. For this reason, it is necessary to secure cooling means separately for the main body side and the exciter.

  When the cooling effect from the outside with respect to the heat generation of the rectifier is large, since the rectifier can be made compact, for example, a method of providing a cooling fan attached to the rotor shaft in the vicinity of the rectifier is known (Patent Document 1). In this case, a space for mounting the cooling fan in the axial direction of the rotor shaft is required.

  Alternatively, a method is known in which a vent hole is formed in the rotor connecting member, and a rotary rectifier is disposed on the outer flow path (Patent Document 2). In this case, it is necessary to process the ventilation holes and the like, and the axial direction is longer.

  Alternatively, a method is known in which an axial fan and a radial fan are provided so as to sandwich a rotary exciter on the rotation side, and a hole for guiding the flow is provided (Patent Document 3). Also in this case, a space for mounting the fan in the axial direction of the rotor shaft is required.

  In addition, a method of securing cooling by arranging a rotary rectifier on the surface of a rotating shaft is known (Patent Document 4). In this case, since the surface of the rotating shaft is used, there is a problem that it is necessary to limit the number of rectifiers installed and to ensure the length of the rotating shaft.

  Accordingly, an object of the present invention is to ensure the cooling performance of the excitation device while suppressing the influence on the arrangement of the rotary rectifier in the brushless rotating electric machine having the rotary rectifier.

  In order to achieve the above-described object, a brushless rotating electrical machine according to the present invention includes a rotor shaft that is rotatably supported around a rotating shaft and extends in the rotating shaft direction, and is fixed to the radially outer side of the rotor shaft. A rotor core extending in the direction, a stator core disposed radially outside the rotor core and extending in the rotation axis direction, and a stator winding wound around the stator core A stator having a plurality of rotary rectifiers that rotate together with the rotor shaft, a frame that houses the rotor core and the stator, and an enclosure for the outside air, An exciter cover having a discharge port for outside air, and the exciter supports the plurality of rotary rectifiers and is mounted around the rotor shaft in the radial direction. A plurality of stirring blades that stir the outside air in the exciter cover that is attached to the support member and extends in the radial direction and the rotation axis direction, and the plurality of rotary rectifiers are attached to the support member. The rotary rectifiers have a rectifying element portion and a heat radiating portion having a substantially rectangular parallelepiped shape and having a heat radiating surface formed in a direction perpendicular to the rotation axis. It is characterized by that.

  ADVANTAGE OF THE INVENTION According to this invention, in the brushless rotary electric machine which has a rotation rectifier, the cooling performance of an exciting device can be ensured, suppressing the influence on arrangement | positioning about a rotation rectifier.

It is a sectional elevation of the brushless rotating electrical machine according to the present embodiment. It is a cross-sectional view of the left half part of the II-II line arrow of FIG. It is a perspective view which shows the state by which the stirring blade was attached to the support member in the brushless rotary electric machine which concerns on this embodiment.

  Hereinafter, a brushless rotating electrical machine according to an embodiment of the present invention will be described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

  FIG. 1 is an elevational sectional view of a brushless rotating electrical machine according to an embodiment of the present invention. The brushless rotating electrical machine 200 includes a rotor 10, a stator 20, and an excitation device 100.

  The rotor 10 includes a rotor shaft 11 that extends in the direction of the rotation axis and is rotatably supported, and a rotor core 12 that is disposed on the radially outer side of the rotor shaft 11 and coupled to the rotor shaft 11. An inner fan 15 is attached to the rotor shaft 11 and rotates with the rotation of the rotor shaft 11. The inner fan 15 is a radial fan that sucks the cooling gas in the axial direction and pushes it out in the radial direction.

  The stator 20 is arranged on the outer side in the radial direction of the rotor core 12 and is formed on the surface of the stator core 21 on the inner side in the radial direction with an interval in the circumferential direction. And a stator winding 22 installed in a plurality of extended slots (not shown).

  The exciter 100 includes a rotary rectifier 110, an exciter rotating unit 121, and an exciter fixing unit 122. The rotational rectifier 110 and the exciter rotating unit 121 are attached to the rotor shaft 11 and rotate together with the rotor shaft 11. The exciter fixing part 122 is arranged on the radially outer side of the exciter rotating part 121 and is fixed stationary. A direct current rectified by the rotary rectifier 110 flows through an exciter rotating unit winding (not shown) included in the exciter rotating unit 121. The exciter fixing part winding (not shown) of the exciter fixing part 122 has an alternating current that is excited by the direct current flowing through the exciter rotating part winding.

  The stator 20 and the rotor core 12 are accommodated in the frame 30. Bearing brackets 34 are connected to both ends of the frame 30 in the axial direction. Each of the bearing brackets 34 supports the bearing 32. The bearing 32 supports the rotor shaft 11 to be rotatable. The excitation device 100 is accommodated in the excitation device cover 61.

  A frame entrance opening 41 and a frame exit opening 42 are formed in the frame 30. As the rotor shaft 11 rotates, the inner fan 15 rotates and drives the cooling gas in the frame 30. The cooling gas is pushed out in the radial direction and flows out of the frame through the frame outlet opening 42. From the outside air, outside air that is a cooling gas flows into the frame 30 through the frame inlet opening 41. The cooling gas flowing into the frame 30 cools the rotor 10 and the stator 20 while passing through the rotor 10 and the stator 20 and then flows into the inner fan 15 side.

  On the other hand, as the rotor shaft 11 rotates, a support member 115 (FIG. 2) described later in the excitation device cover 61 rotates. As will be described later, the cooling gas in the exciter cover 61 is driven as the support member 115 rotates. As a result, the outside air, which is a cooling gas, flows from the outside air intake port 62, cools the heat generating part such as the rotary rectifier 110, and then the cooling gas flows out from the outside air discharge port 63.

  FIG. 2 is a longitudinal sectional view of the left half portion taken along line II-II in FIG. FIG. 3 is a perspective view showing a state in which a stirring blade is attached to the support member. In FIG. 3, the rotary rectifier 110 is not shown for easy viewing.

  A support member 115, also called a retaining ring, is attached to the rotor shaft 11. The support member 115 has a through hole formed in the center, and extends in a direction perpendicular to the rotation axis, and has a disk shape.

  Support member openings 115a are formed in the support member 115 at intervals in the circumferential direction. The support member 115 is provided with a plurality of rotary rectifiers 110 spaced apart from each other in the circumferential direction. Each rotary rectifier 110 includes a rectifying element unit 111, a heat radiating unit 112, a connecting unit 113, and a fastening unit 114. Each of the two rotary rectifiers 110 is arranged in front of and behind the support member 115 in the direction of the rotation axis. Each of the two rotary rectifiers 110 shares the same heat dissipation part 112. The heat dissipating part 112 is arranged on the outermost radial direction in the rotary rectifier 110 and penetrates the support member 115 in the rotation axis direction.

  A rectifying element unit 111 is disposed at a position facing the support member opening 115a on the radially inner side of the heat dissipating unit 112. The heat generated in the rectifying element unit 111 is transmitted to the heat radiating unit 112 and transmitted from the surface of the heat radiating unit 112 to the cooling gas to be dissipated. In the rotary rectifier 110, the fastening portion 114 is disposed on the innermost radial direction, and the connecting portion 113 connects the fastening portion 114 and the rectifying element portion 111.

  A stirring blade 118 is attached at a position between the heat dissipating portions 112 adjacent to each other in the circumferential direction of the support member 115. The stirring blade 118 extends in the axial direction and further in the radial direction. Here, compared with the case where the stirring blade 118 is not provided, it is not necessary to expand the space in particular to provide the stirring blade 118, and the stirring blade 118 is installed without affecting the arrangement in the rotary rectifier 110. Can do.

  An annular plate 116 is provided at the radial tip of the support member 115. The annular plate 116 has a cylindrical shape extending in the rotation axis direction, and is coupled to the support member 115 at the center of the length in the rotation axis direction.

  A plurality of air holes 116a are formed in the annular plate 116 at intervals in the circumferential direction. The plurality of vent holes 116a are formed at positions symmetrical to each other in the circumferential direction with the stirring blade 118 interposed therebetween. The plurality of vent holes 116a are provided at positions symmetrical to each other in the axial direction across the axial position of the joint portion between the support member 115 and the annular plate 116.

  The stirring blade 118 may be attached with an inclination with respect to the radial direction. In this case, the airflow can be optimized by changing the position of the vent hole 116a to an appropriate position according to the flow of the airflow.

  When the rotor shaft 11 is rotating, the support member 115 attached to the rotor shaft 11 rotates. As the support member 115 rotates, the rotary rectifier 110 rotates. Further, the stirring blade 118 attached to the support member 115 also rotates.

  As the stirring blade 118 rotates, the cooling gas that moves relative to the rotary rectifier 110 in the circumferential direction is also stirred in the axial direction and the radial direction, and the support member opening 115a and the vent hole 116a also flow in the cooling gas. The cooling gas moves around the rotary rectifier 110 while becoming a path.

  As described above, the flow velocity of the cooling gas around the rotary rectifier 110 is increased, the surface heat transfer coefficient with the cooling gas on the surface of each part including the heat radiating portion 112 of the rotary rectifier 110 is increased, and the cooling capacity is increased. Will improve.

  As described above, in the brushless rotating electrical machine 200 having the rotary rectifier 110, the cooling performance of the excitation device 100 can be ensured while suppressing the influence on the arrangement of the rotary rectifier 110.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, embodiment is shown as an example and is not intending limiting the range of invention. For example, in the embodiment, the case where the main body side and the exciter side are separately cooled has been described as an example, but the present invention is not limited to this. For example, an exciter having a stirring blade according to the present invention may be used in a rotating electrical machine of a type in which an exciter and a main body are connected by a duct and a cooling gas cooled by a cooler is circulated.

  Furthermore, these embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Rotor, 11 ... Rotor shaft, 12 ... Rotor core, 15 ... Inner fan, 20 ... Stator, 21 ... Stator core, 22 ... Stator winding, 30 ... Frame, 32 ... Bearing, 34 ... Bearing Bracket, 41 ... frame inlet opening, 42 ... frame outlet opening, 61 ... exciter cover, 62 ... outside air intake, 63 ... outside air outlet, 100 ... exciter, 110 ... rotary rectifier, 111 ... rectifier element, 112 ... Heat dissipating part, 113 ... connecting part, 114 ... fastening part, 115 ... supporting member, 115a ... supporting member opening, 116 ... annular plate, 116a ... vent hole, 118 ... stirring blade, 120 ... exciter, 121 ... exciter rotating part 122 ... Exciter fixing part, 200 ... Brushless rotating electrical machine

Claims (3)

A rotor shaft rotatably supported around the rotation axis and extending in the direction of the rotation axis; and a rotor core fixed to the outer side in the radial direction of the rotor shaft and extending in the rotation axis direction;
A stator core disposed on the outer side in the radial direction of the rotor core and extending in the direction of the rotation axis, and a stator winding wound around the stator core;
An excitation device having a plurality of rotary rectifiers rotating with the rotor shaft;
A frame for housing the rotor core and the stator;
An exciter cover containing the exciter and having an outside air inlet and an outside air outlet;
With
The excitation device is
A disk-shaped support member that supports the plurality of rotary rectifiers and is attached around the radial direction of the rotor shaft;
A plurality of stirring blades for stirring the outside air in the exciter cover attached to the support member and extending in the radial direction and the rotation axis direction;
The plurality of rotary rectifiers are attached to the support member and are arranged at intervals in the circumferential direction,
Each of the rotary rectifiers includes a rectifying element portion and a heat radiating portion having a substantially rectangular parallelepiped shape and having a heat radiating surface formed in a direction perpendicular to the rotation axis.
This is a brushless rotating electrical machine.   2. The brushless rotating electrical machine according to claim 1, wherein the support member is formed with support material openings corresponding to respective circumferential positions of the plurality of rotary rectifiers at intervals in the circumferential direction. . A cylindrical annular plate attached to the outside of the support member in the radial direction and extending in the axial direction;
3. The brushless rotating electrical machine according to claim 1, wherein the annular plate has a vent hole formed in a radially outer portion of each of the plurality of rotary rectifiers.

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