Permanent magnet motor and manufacturing method thereof

Abstract

PROBLEM TO BE SOLVED: To provide a function for confirming that an adhesive agent is filled uniformly between a permanent magnet and a rotor core over the whole area with ease and with certainty when adhering the permanent magnet to the rotor core in a permanent magnet motor. SOLUTION: In a permanent magnet motor, a groove matched to a shape of a permanent magnet is formed to an electromagnetic steel plate constituting a rotor core. An adhesive agent reservoir recessed part to which an adhesive agent flowing out from between bottom surfaces of both parties via a gap between a side wall of the groove and a side wall of the permanent magnet is introduced when the permanent magnet is pushed in the groove to be adhered by the adhesive agent applied between the bottom surfaces of both parties, is formed at an upper end of the side wall of the groove. The quantity of the adhesive agent stored in the recessed part can be visibly recognized to confirm an application state of the adhesive agent. COPYRIGHT: (C)2012,JPO&INPIT

Description

technical field [0001] The invention relates to a permanent magnet motor and a manufacturing method thereof, in particular to a bonding technique of a magnet to a rotor core. Background technique [0002] Usually, in such a permanent magnet motor, the magnet bonding surface formed on the outer peripheral surface or the inner peripheral surface of the rotor core formed by laminating electromagnetic steel sheets has the same width as the magnet and a depth that does not affect the magnetic properties. A plurality of grooves whose depth is one-tenth of the thickness of the magnet is provided, and an adhesive is coated between the bottom surface of the groove and the bottom surface of the magnet, and the magnet is positioned in the groove to form a structure bonded by pushing. [0003] In this way, the following Patent Documents 1 and 2 are cited as techniques for attaching magnets to the outer surface of the rotor core with an adhesive. [0004] Patent Document 1: Japanese Pat...

AI Technical Summary

Problems solved by technology

[0011] However, such spilled adhesive is essentially useless, and contact with workers or other products during the manufacturing process will deteriorate the quality, so it is desirable to keep it to a minimum.

[0012] On the other hand, if the adhesive is too small and the adhesive does not overflow around the magnet, it cannot be confirmed whether the adhesive is evenly filled between the bottom surface of the magnet and the bottom of the groove formed in the rotor core. The application has to be carried out in such a way that the adhesive overflows to some extent, for this reason, after the magnet 1 is pressed in, the process of removing and cleaning the adhesive that has flowed out without any control in the entire area of ​​its periphery is essential

In particular, when the spilled adhesive is cured, it is difficult to remove it, the manufacturing process becomes complicated, and it becomes a cause of cost increase.

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