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Induction motor and manufacturing method thereof

A technology for induction motors and manufacturing methods, which is applied to asynchronous induction motors, manufacturing squirrel-cage rotors, manufacturing stator/rotor bodies, etc., and can solve the problems of unstable joint between aluminum end rings and copper conductor bars, reduced productivity, and increased costs, etc. question

Inactive Publication Date: 2015-03-25
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the case of friction stir welding a copper conductor bar and an end ring, the temperature of the joint of copper friction stir welding is about 700°C, which is significantly higher than the melting point of aluminum, 660.4°C, and the end ring must be made of copper. Compared with the case where both the conductor bar and the end ring are made of aluminum, the cost is greatly increased
In addition, the scanning speed of the bonding tool is about 1000 mm / min in the case of aluminum with a thickness of 5 mm, but it becomes 200 mm / min in the case of an oxygen-free copper plate with a thickness of 5 mm, and the productivity decreases.
[0010] On the other hand, when the conductor bar is made of copper or copper alloy and the end of the conductor bar is inserted into semi-solidified aluminum or the like, the end ring is integrated by cooling the aluminum, the temperature of the semi-solidified aluminum is higher than that of the semi-solidified aluminum. Copper has a low melting point, so the bond between the aluminum end ring and the copper conductor bar is not stable

Method used

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  • Induction motor and manufacturing method thereof
  • Induction motor and manufacturing method thereof
  • Induction motor and manufacturing method thereof

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no. 1 approach ］

[0027] Below, refer to Figure 1 to Figure 8 The induction motor and the method for manufacturing the induction motor of the present embodiment will be described. In each drawing, the same part is denoted by the same reference numeral, and thus the overlapping description is appropriately omitted.

[0028] In the induction motor of the present embodiment, the plurality of conductor rods embedded in the circumference of the core are constituted by the rod-shaped first metal portion and the block-shaped second metal portion joined to both ends thereof. Then, by joining the end ring 5 to the metal constituting the second metal portion, the conductor bars are electrically short-circuited by the end ring.

[0029] (1. Structure)

[0030] (1-1, overall structure)

[0031] figure 1 It is a cross-sectional view showing the structure of the induction motor according to the embodiment of the present invention. In the induction motor of the present embodiment, the rotor 2 and the st...

no. 2 approach ］

[0084] Next, the second embodiment will be described. This embodiment changes the configuration of the rotor of the first embodiment. Along with this, the conductor bar bonding process in the manufacturing process is also changed.

[0085] (1, the structure of the rotor)

[0086] Figure 9 is a perspective view showing the structure of the rotor of the induction motor in the second embodiment, Figure 10 It is a cross-sectional view showing the structure of the rotor of the induction motor.

[0087] The end ring 5 is formed by die casting so that both ends of the conductor bar 6 are joined, respectively.

[0088] (2. Manufacturing process)

[0089] refer to Figure 11 The manufacturing method of the induction motor of this embodiment is demonstrated. In the present embodiment, the induction motor is manufactured through the following steps.

[0090] (2-1. Conductor bar bonding process)

[0091] In the conductor bar joining step of the second embodiment, the conductor ...

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Abstract

An induction motor includes multiple conductor bars buried and disposed in a rotor core in a circumferential direction, and end rings (5) joined with the multiple conductor bars so as to cause respective both ends thereof to be electrically conducted. Each conductor bar includes a first bar-shape metal portion, and two second metal portions joined with both ends thereof. The second metal portion is formed in a solid block shape. The first and second metal portions are joined with each other by friction stir welding or friction welding.

Description

[0001] References to related applications [0002] This application is based on and claims the benefit of priority from prior Japanese Patent Application No. 2013-194928 filed on September 20, 2013, the entire contents of which are hereby incorporated by reference. technical field [0003] Embodiments of the various aspects described here generally relate to an induction motor including a squirrel-cage rotor and a method of manufacturing the induction motor. Background technique [0004] The cage-type three-phase induction motor operates by three-phase alternating current and does not require a commutator, brushes, etc. Therefore, compared with other types of motors such as DC motors, the structure is simple and the service life is long. Therefore, it is widely used as a power source for industrial equipment such as pumps, blowers (fans), and robots (robots). [0005] The rotor of such an induction motor is composed of a cylindrical iron core, a cage consisting of conductor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K17/16H02K15/02
CPCH02K17/165H02K15/0012Y10T29/49012H02K17/20
Inventor 富冈泰造
Owner KK TOSHIBA