This application claims priority to Italian Patent Application 102019000005074 filed Apr. 4, 2019, the entirety of which is incorporated by reference herein.

This invention relates to the technical field of electric machines.

More specifically, this invention relates to a rotary electric machine and to a method for producing a machine of this kind.

Generally speaking, this specification also refers to what in technical terms are known as “sealed” electric machines, without thereby losing in generality, that is to say, without excluding, unless otherwise specified, machines known as “open” machines.

The term “sealed rotary electric machine” is used to denote a closed electric machine comprising a sealed container—or enclosure—which is generally composed of a casing and a cap fixed sealedly thereto and from which there extend the shaft of the rotor unit and the terminals for powering and controlling the machine.

The main advantage of sealed electric machines is that the moving parts and electronic control circuitry located inside the container are isolated from extraneous agents such as liquids and dust, for example, which can interfere with the functioning of the electric machine, leading to failures and rapid wear of components.

For convenience, the term “sealed machines is also used to refer to electric machines in which the electronic control circuitry is mounted in a sealed compartment, whilst the stator and the rotor are housed in an open compartment which, for example, can be ventilated for cooling purposes.

Thus, thanks to the isolation provided by their sealed enclosures, these electric machines are characterized by high dependability and long-life durability.

A rotary electric machine of the “sealed” type is illustrated by way of example in patent application WO2013/008180 in the name of the same Applicant.

In order to ensure that the interior of the enclosure or sealed compartment remains free of dust and humidity, these machines are normally assembled in a controlled atmosphere which keeps dust and humidity out of the assembly space completely (or limits their presence to very small quantities).

Up to the present, in the solutions where the internal space is totally inaccessible, the enclosure is sealed by fixing the casing to the cap.

Disadvantageously, a solution of this kind prevents access to the internal space for operations which might become necessary after the enclosure has been sealed.

For example, it may be necessary to access the internal space to work on the shaft of the rotor unit when mounting rotary components thereon.

In this context, the technical purpose which forms the basis of this invention is to propose a rotary electric machine, as well as a method for making it, to overcome at least some of the above mentioned disadvantages of the prior art.

More specifically, this invention has for an aim to provide a rotary electric machine capable of providing access to the internal space of the enclosure after the enclosure has been closed.

The technical purpose indicated and the aims specified are substantially achieved by a rotary electric machine comprising the technical features described in one or more of the accompanying claims.

The dependent claims correspond to possible different embodiments of the invention.

Other features and advantages of the invention are more apparent in the detailed description below, with reference to a non-limiting and non-exclusive preferred embodiment of a rotary electric machine and a method for making it.

