Electrical motor apparatus having improved cooling system

1. An electric motor apparatus comprising:

a first compartment housing an electric motor mounted on a rotating shaft;

a second compartment housing an electric circuit adapted to connect said electric motor to a power supply source; and

a cooling system adapted to dissipate heat generated by said electric motor apparatus, comprising

a fan mounted on said rotating shaft in a position adjacent to said second compartment and on an opposite side of the shaft with respect to said first compartment;

at least one finned heat exchanger adapted to dissipate heat generated by said electric circuit inside said second compartment;

an additional heat exchanger comprising a pipe bundle connected to a wall of said first compartment so as to extend along a longitudinal extension of said rotating shaft; and

an air conveyor operatively associated with said fan at a conveyor inlet, and forming a ventilation channel enclosing air in operative contact with the finned heat exchanger between the conveyor inlet and inlet of the additional heat exchanger.

2. The electric motor apparatus according to claim 1 , wherein said finned heat exchanger is positioned on a wall of said second compartment and adapted such that a portion of said finned heat exchanger faces the inside of said second compartment, said finned heat changer comprising a plate having one or more mutually coupled modules.

3. The electric motor apparatus according to claim 2 , wherein said air conveyor comprises:

a first portion housing said fan, said first portion being coupled with the wall of said second compartment opposite said first compartment;

a second portion connected transversely to said first portion so as to couple with the wall of said second compartment on which said finned heat exchanger is positioned;

said second portion comprising a ventilation channel having a first opening adapted to allow the entry of a cooling air flow into said ventilation channel, a second opening facing said finned heat exchanger and a third opening facing the pipes of the pipe heat exchanger.

4. The electric motor apparatus according to claim 3 , wherein said ventilation channel comprises an inner wall opposite said second opening which has a first section with curvilinear path with concavity facing said second opening, and a second section that has a first curvilinear segment joined with said first section and concavity facing in the opposite direction to said second opening, and a second substantially rectilinear segment that extends from said first curvilinear segment towards said third opening in a divergent manner with respect to said second opening.

5. The electric motor apparatus according to claim 2 , wherein said one or more modules comprise a central body from which a first series of fins and a second series of fins lean forward transversely and on opposite sides from each other.

6. The electric motor apparatus according to claim 5 , wherein said first series of fins and said second series of fins comprise one or more groups of mutually equidistant fins arranged consecutive to one another along a longitudinal extension of said central body.

7. The electric motor apparatus according to claim 6 , wherein said one or more groups of fins comprise at least a first group and a second group, and wherein one or more mutually parallel bars pass through an opening from which said finned heat exchanger faces the inside of said second compartment, each bar being operatively connected to a portion of said central body between said first group and said second group.

8. The electric motor apparatus according to claim 6 , wherein a ratio of a distance between ends of said fins and said central body to a distance between the fins of said one or more groups of fins has a value between two and four.

9. The electric motor apparatus according to claim 8 , wherein said one or more modules comprise a male connection and a female connection which are defined at opposite ends of said central body.

10. The electric motor apparatus according to claim 9 , wherein said male connection comprises a projection and said female connection comprises a groove.

11. An electric motor apparatus comprising:

a first compartment housing an electric motor mounted on a rotating shaft;

a second compartment housing an electric circuit adapted to connect said electric motor to a power supply source; and

a cooling system adapted to dissipate heat generated by said electric motor apparatus, comprising

a fan mounted on said rotating shaft in a position adjacent to said second compartment and on an opposite side of the shaft with respect to said first compartment;

at least one finned heat exchanger adapted to dissipate heat generated by said electric circuit inside said second compartment, positioned on a wall of said second compartment and adapted such that a portion of said at least one finned heat exchanger faces the inside of said second compartment, said at least one finned heat changer comprising a plate having one or more mutually coupled modules;

an additional heat exchanger comprising a pipe bundle connected to a wall of said first compartment so as to extend along a longitudinal extension of said rotating shaft;

an air conveyor operatively associated with said fan, with said finned heat exchanger and with said additional heat exchanger so as to convey air from said fan towards said finned heat exchanger and said additional heat exchanger, the air conveyor including a first portion housing said fan, said first portion being coupled with the wall of said second compartment opposite said first compartment, a second portion connected transversely to said first portion so as to couple with the wall of said second compartment on which said finned heat exchanger is positioned, said second portion comprising a ventilation channel having a first opening adapted to allow the entry of a cooling air flow into said ventilation channel, a second opening facing said finned heat exchanger and a third opening facing the pipes of the pipe heat exchanger.

12. The electric motor apparatus according to claim 11 , wherein said ventilation channel comprises an inner wall opposite said second opening which has a first section with curvilinear path with concavity facing said second opening, and a second section that has a first curvilinear segment joined with said first section and concavity facing in the opposite direction to said second opening, and a second substantially rectilinear segment that extends from said first curvilinear segment towards said third opening in a divergent manner with respect to said second opening.

13. An electric motor apparatus comprising:

a first compartment housing an electric motor mounted on a rotating shaft;

a second compartment housing an electric circuit adapted to connect said electric motor to a power supply source; and

a cooling system adapted to dissipate heat generated by said electric motor apparatus, comprising

a fan mounted on said rotating shaft in a position adjacent to said second compartment and on an opposite side of the shaft with respect to said first compartment;

at least one finned heat exchanger adapted to dissipate heat generated by said electric circuit inside said second compartment and positioned on a wall of said second compartment such that a portion of said finned heat exchanger faces the inside of said second compartment, said finned heat changer including a plate having one or more mutually coupled modules, the one or more modules including a central body from which a first series of fins and a second series of fins lean forward transversely and on opposite sides from each other, wherein the first series of fins and second series of fins include one or more groups of mutually equidistant fins arranged consecutive to one another along a longitudinal extension of said central body, the one or more groups of fins comprise at least a first group and a second group, and wherein one or more mutually parallel bars pass through an opening from which said finned heat exchanger faces the inside of said second compartment, each bar being operatively connected to a portion of said central body between said first group and said second group;

an additional heat exchanger comprising a pipe bundle connected to a wall of said first compartment so as to extend along a longitudinal extension of said rotating shaft; and

an air conveyor operatively associated with said fan, with said finned heat exchanger and with said additional heat exchanger so as to convey air from said fan towards said finned heat exchanger and said additional heat exchanger.