JP2537380Y2 - Aluminum die-casting frame of rotating electric machine - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to an aluminum die-casting frame of a rotating electric machine in which a casing of the rotating electric machine is formed of aluminum die-casting.

[Prior Art] FIG. 2 is a sectional view showing a part of a conventional rotating electric machine, and FIG. 3 is a left side view of a part of the rotating electric machine shown in FIG.

In the figure, (1) is a cylindrical frame which is a casing of the rotating electric machine, which is formed by casting an iron-based material. (1a) is a plurality of cooling fins radially provided on the outer peripheral portion of the frame (1), and is formed integrally with the frame (1) by casting. Reference numeral (2) denotes a stator of a rotating electric machine constituted by laminating a large number of silicon steel plates. The stator (2) has a plurality of slots provided on an inner peripheral portion thereof. A coil (3) is wound.

Furthermore, the outer diameter shape of the stator (2) is often configured in a square shape (2a) in which a part of a round shape is partially cut away in order to generally improve the yield of silicon steel sheets. The outer diameter portion of the stator (2) and the inner diameter portion of the frame (1) are not in full contact with each other, and are often in partial contact as indicated by a in FIG. .

The frame of the conventional rotating electric machine is configured as described above, and the operation will be described next.

When a stator coil (3) wound around the stator (2) constructed as shown in FIGS. 2 and 3 is energized, the rotating electric machine forms a magnetic circuit in the stator (2). . The height of the magnetic loading of the magnetic circuit is determined by the number of turns of the stator coil (3) if the iron core width is the same.

As shown in FIG. 3, when the outer diameter of the stator (2) is irregular, for example, when it is partially formed into a square shape, and the magnetic load is extremely low, the influence of the magnetic load is almost zero. Although it does not appear, when the magnetic load is increased to some extent, the magnetic flux concentrates on the contact portion a of the stator (2), and the magnetic flux also flows on the frame (1), thereby forming a magnetic circuit.

[Problems to be Solved by the Invention] The conventional rotating electric machine frame is configured as described above. In particular, when it is strongly required to reduce the weight of the rotating electric machine, the frame (1) is cast. Aluminum alloy is required instead of iron-based material. Aluminum alloy is a non-magnetic material, and when the outer diameter of the stator (2) is square as described above, However, there is a problem that a magnetic circuit is not formed in the frame (1), and thus the no-load current is significantly increased. For this reason, it is difficult to form the frame (1) from an aluminum alloy material, and it is necessary to use a magnetic casting material such as an iron-based material.
There was a problem that weight reduction could not be achieved.

This invention has been made in order to solve the above-mentioned problems, and has as its object to obtain an aluminum die-cast frame of a rotating electric machine that forms a frame with a non-magnetic material such as an aluminum alloy material.

[Means for Solving the Problems] The aluminum die-casting frame of the rotating electric machine according to the present invention has a number of slots on an inner peripheral portion of a ring shape, and a stator coil is wound around the slots. In an aluminum die casting frame of a rotary electric machine made of a cylindrical aluminum die cast material for accommodating a stator in an inner diameter portion, the aluminum die casting frame is integrated between the inner diameter portion of the aluminum die casting frame and the outer diameter portion of the stator. The magnetic member comprises an annular portion that comes into contact with the outer peripheral portion of the stator, and a protruding portion formed on an inner diameter portion of the annular portion.

[Operation] In the aluminum die-casting frame of the rotating electric machine according to the present invention, the magnetic member has a stator having an outer diameter shape of, for example, a rectangular shape, and a part of the frame has a magnetic circuit even when the magnetic load is high. When the stator is mounted on the aluminum die-cast frame, it functions as positioning of the stator with respect to the aluminum die-cast frame.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral (4) denotes an aluminum die-casting frame constituting a casing of the rotating electric machine. The aluminum die-casting frame (4) is a magnetic member such as a cylindrical steel pipe made of a magnetic material or an iron-based cast cylinder. (5) is cast. As shown in the cross-sectional view of FIG. 1, the magnetic member (5) has an annular portion that comes into contact with an outer peripheral portion of a stator (2) described later, and has an L-shaped cross section in the radial direction. And is cast into the frame (4) at the position where the stator (2) is to be mounted. That is,
The magnetic member (5) includes an annular portion (5a) and the annular portion (5a).
The protrusion (5b) formed on the inner diameter portion of (a) has an L-shape integrally formed. One piece of the magnetic member (5) having the L-shaped cross section also functions as a positioning when the stator (2) is mounted on the frame (4). That is, in FIG. 1, the stator (2) is inserted from the left to the right with respect to the frame (4), and the stator (2) is inserted.
Is positioned at a position in contact with one piece of the magnetic member (5) having an L-shaped cross section.

(4a) is this aluminum die-cast frame (4)
A plurality of cooling fins radially provided on the outer peripheral portion are formed integrally with the aluminum die casting frame (4). Reference numeral (2) denotes a stator of a rotating electric machine constituted by laminating a large number of silicon steel plates. The stator (2) has a plurality of slots provided on an inner peripheral portion thereof. A coil (3) is wound.

Next, the operation will be described. When a current is applied to the stator coil (3) of the stator (2) of the rotating electric machine configured as shown in FIG. 1, a magnetic circuit is formed in the stator (2).

The aluminum die-casting frame (4) of the present invention is a non-magnetic aluminum alloy die-casting body, and the inner diameter of the aluminum die-casting frame (4) where the stator (2) is mounted is cylindrical. Since the magnetic member (5) is cast, the outer shape of the stator (2) is of an irregular shape partially formed in a rectangular shape or the like, and the magnetic flux concentrates on the contact portion a shown in FIG. However, a part of the aluminum die-casting frame (4), that is, the magnetic member (5) can be used as a magnetic circuit, and the weight can be reduced without increasing the no-load current.

[Effects of the Invention] As described above, according to the invention, the outer casing of the rotating electric machine is made of aluminum die casting, and a magnetic member is cast into the stator mounting inner diameter portion of the aluminum die casting frame. Since it is composed of the annular portion and the protruding portion formed on the inner diameter portion of the annular portion, the weight of the frame can be reduced without increasing the no-load current.

Further, a protrusion formed on the annular portion of the magnetic member,
It exerts the function of positioning when the stator is mounted on the aluminum die-casting frame, improving the workability of assembly.

[Brief description of the drawings]

1 is a sectional view showing a part of a rotating electric machine according to an embodiment of the present invention, FIGS. 2 and 3 show a part of a conventional rotating electric machine, FIG. 2 is a sectional view, and FIG. It is a side view. In the figure, (2) is a stator, (3) is a stator coil,
(4) is a frame, (4a) is a fin, (5) is an iron cast cylinder, (5a) is an annular portion, and (5b) is a locking portion. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Scope of request for utility model registration] 1. A rotating member made of a cylindrical aluminum die-cast material having a ring-shaped inner peripheral portion having a plurality of slots, and a stator in which a stator coil is wound is housed in an inner diameter portion of the slots. In an aluminum die casting frame of an electric machine, a magnetic member integrally cast into the aluminum die casting frame is provided between an inner diameter portion of the aluminum die casting frame and an outer diameter portion of the stator, and the magnetic member is fixed to the aluminum die casting frame. An aluminum die-casting frame for a rotating electric machine, comprising: an annular portion abutting on an outer peripheral portion of a child; and a protruding portion formed on an inner diameter portion of the annular portion.