Rotating electrical machine

Abstract

The invention provides a rotating electrical machine. The rotating electrical machine includes a rotor and a stator. A permanent magnet is attached to the rotor. The stator opposes the rotor with a gap provided therebetween, and has an open slot that opens toward the rotor and in which a high-voltage wire is installed. The gap has a gap length at which the sum of losses including a surface loss that occur when the high-voltage wire is excited and the rotor is rotated at a high rotation speed is less than or equal to a threshold that corresponds to a target loss.

Description

technical field [0001] The disclosed embodiments relate to a rotating electric machine. Background technique [0002] Conventionally, a rotating electrical machine having a rotor to which permanent magnets are attached has been widely used for general industrial purposes and the like (for example, refer to Patent Document 1). [0003] Specifically, the rotating electrical machine of Patent Document 1 includes: a rotor configured by embedding permanent magnets in laminated rotor cores; configuration. [0004] Such a stator has semi-closed winding slots (hereinafter referred to as “semi-closed slots”) in which the circumferential width of the opening is smaller than the inner circumferential width on the inner periphery. Low voltage windings are generally installed in this semi-closed slot. [0005] On the other hand, open winding slots (hereinafter referred to as “open slots”) in which the circumferential width of the opening is equal to the internal circumferential width ...

AI Technical Summary

Problems solved by technology

[0009] Specifically, in the case of a conventional rotating electrical machine, it is preferable to reduce the above-mentioned gap width (gap length) as much as possible to suppress the amount of permanent magnets used, but since the gap length becomes smaller, the gap magnetic flux density becomes higher. , thus increasing the surface loss

In addition, if the above-mentioned open grooves are combined on this basis, the surface loss will be further easily increased.

[0010] That is, combining a rotor with permanent magnets and a stator with open slots can be said to be extremely susceptible to surface loss

Furthermore, since the rotor is heated when the surface loss increases, it becomes easily affected by demagnetization due to heat, and even if the gap length is reduced, the amount of permanent magnets used cannot be suppressed.

[0011] In this regard, although the surface loss can be reduced by increasing the gap length, the amount of permanent magnets used cannot be suppressed, and the total value of surface loss, iron loss, copper loss and other losses (hereinafter referred to as "total loss") increase

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