JPS62100152A - Manufacture of rotor - Google Patents

Abstract

PURPOSE:To form a clearance between a cage type conductor and a core slot, and to reduce stray load loss by casting a conductive material to a rotor core at low pressure, shaping the cage type conductor and pressing and molding an end ring. CONSTITUTION:A rotor core 4 is fixed into molds 1-3, and a conductive material 14 such as aluminum is injected from a sleeve 15 at pressure smaller than normal pressure. Consequently, a cage type conductor 19 is shaped, and end rings 9 and 10 in the cage type conductor 19 are pressed and molded by a press mold, thus forming a cage type rotor 18. Accordingly, clearances are shaped among the cage type conductor 19 and the inner walls of slots 5 for the rotor core 4, and the same effect as the cage type conductor 19 is insulated is obtained, thus reducing stay load loss, then improving torque characteristics.

Description

[Detailed description of the invention] (b) Industrial application fields This invention relates to an improved method of manufacturing rotors.

(B) Prior art A conventional rotor is constructed as shown in, for example, Japanese Patent Laid-Open No. 58-222763.

Here, a conventional example will be explained with reference to this publication. In FIG. 4, (1) is a fixed mold, (2) is an intermediate mold, and (3) is a movable mold, which constitute a casting mold. (4) is a rotor core, and this rotor core is formed by aligning the slots (5), laminating it on a temporary core bar (6), and tightening it with a split ring (7). Rotor core (4) tightened and fixed with this temporary core metal
is inserted into the internal space (8) of the intermediate mold (2). End rings (9) σα are formed on the clamping surfaces of the pair of fixed mold (1) and movable mold (3), respectively, by opening into the openings of the slots (5) of the rotor core (4). An impaction recess αυ0 is provided for this purpose. The impaction recess 0υ of the fixed type (1) opens into a recess (I3) serving as a runner. This recess communicates with a sleeve α9 into which a molten conductive material (14) is injected after tightening.The conductive material (14) injected from this sleeve is transferred to a
The density is 2.55 ~ by casting at high pressure of 7 an ”
By forming a squirrel cage conductor (l?) of 2.45 g/(2)3, a rotor with a large stall torque of 0 seconds is formed.

(C) Problems to be Solved by the Invention However, since the cage conductor αη is formed by casting under high pressure, the inner wall of the slot (5) and the conductive material I are in close contact with each other, resulting in so-called stray load loss. There was a problem that this caused the torque to decrease.

In order to solve the above problems, this invention lowers the injection pressure of the conductive material forming the squirrel cage conductor than normal injection pressure to prevent stray load loss from occurring, and The purpose is to pressurize the ring and increase the stalling torque.

This invention involves forming a squirrel cage conductor by injecting a conductive material into a rotor core having slots at a pressure lower than the normal injection pressure, and then inserting the end ring of the squirrel cage conductor. Pressure molded.

(E) Function This invention involves casting a conductive material into the rotor core at low pressure to form a squirrel-cage conductor, and then pressure-molding the end ring of the squirrel-cage conductor. A gap is formed between the conductor and the inner wall of the slot to obtain the same effect as if the squirrel cage conductor were insulated.
It aims to improve torque characteristics by reducing stray load loss, and increases the density of the end ring to reduce the resistance value of the squirrel cage conductor, improving stall torque.

(f) Examples The present invention will be explained below based on the examples shown in FIGS. 1 to 3.

Incidentally, the same parts or equivalent parts as in the conventional example shown in FIG. 4 are given the same reference numerals, and the explanation thereof will be omitted.

After reducing the pressure injected from the sleeve [15 and forming the squirrel cage conductor a9 from the casting K, the end ring (9) a of this squirrel cage conductor is formed. [is to be pressure-formed with a press mold (21c2υ).This press mold has four parts (231
231 is provided. This recess is the end ring (9
) It is formed so that αα expands inward.

In the method for manufacturing a rotor configured in this manner, the manufacturing order for a rotor of 0 seconds is as follows: The slots (5) are aligned, the temporary core bar (6) is stacked, the split ring (rotor tightened with force) The iron core (4) is inserted into the internal space (8) of the intermediate mold (2), and a fixed mold (1) and a movable mold (3) are placed on both sides of the intermediate mold.
and b; the tightening is fixed. Then, the conductive material (14) is 40kLi from the sleeve 0!19 provided on the fixed fi+.
/an'' injection pressure, weight density is 2゜15 ~
A cage conductor α9 having a weight of 2.05 g/-3 is formed. After that, the rotor core (4) is taken out from the casting mold, and the squirrel cage conductor (end ring 19 + 91 (to) is press mold (2t) 01) is press-formed to complete the rotor (1). do.

Squirrel cage conductor a! J is formed by lowering the casting pressure, and a gap is formed between the inner wall of the slot (5) and the conductive material (14), and the torque is reduced by the close contact between the inner wall of the slot and the conductive material. Trying to reduce stray load loss.

In addition, the cage-shaped conductor (lj end ring (9) α0) is pressure-formed by the press mold (a) (21) so as to expand inward, and the trap end ring +9 + (1
In addition to crushing and extinguishing the nest that occurred in 0),
The density is increased to reduce the resistance value. Therefore, the stall torque of the rotor α can be improved, and the motor efficiency can be improved.

(g) Effects of the Invention The rotor manufacturing method of the present invention involves forming a squirrel-cage conductor by casting a conductive material into a rotor core having slots at a pressure lower than the normal injection pressure, and then molding the squirrel-cage conductor. The end ring is pressure molded, which creates a gap between the inner wall of the slot and the conductive material to prevent torque loss due to stray load losses. Moreover, since the end ring is press-formed after casting to increase the density of the end ring, the stall torque can be improved without increasing stray load loss.

[Brief explanation of drawings]

1 to 3 illustrate the present invention; FIG. 1 is a sectional view of a rotor casting device; FIG. 2 is a sectional view showing a state in which an end ring is pressurized; and FIG. 3 is a sectional view of the rotor. 4 are sectional views of a conventional casting device. (4)...Rotor core, (5)...Slot,
t9) (10)...end ring, (14)...
Conductive material, 09... squirrel cage conductor. Applicant Sanyo Electric Co., Ltd. and 1 other representative Patent attorney Shizuo Sano No. 1ffl Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A rotation characterized by forming a squirrel-cage conductor by injecting a conductive material into a rotor core having slots at a pressure lower than the normal injection pressure, and then pressure-molding an end ring of the squirrel-cage conductor. Method of producing children.