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EP-4742507-A1 - DYNAMOELECTRIC MACHINE WITH A COOLING SYSTEM

EP4742507A1EP 4742507 A1EP4742507 A1EP 4742507A1EP-4742507-A1

Abstract

The invention relates to a dynamoelectric machine (1) with a stator (2) which is arranged in a frame (26) whose frame openings (27) can be closed section by section at least on one side, a winding system which is arranged in axially extending slots of the stator (2) and which forms winding heads (6) on the end faces of the stator (2), a rotor (11) which is arranged coaxially to the stator (2) and spaced apart from the stator (2) by an air gap (8), wherein the rotor (11) is rotatably held by DE and NDE bearings arranged in the frame (26), a top-mounted cooler (18) which is arranged on one side of the frame (26) and corresponds fluidically to the frame openings (27) via top-mounted cooler openings (28), such that cooling circuits (22, 23) of a cooling system can be adjusted, which forms at least a primary circuit (22) and optionally a secondary circuit (23) each by means of guide elements (29), at least one fan arrangement (19,24) axially outside a frame (26) which is arranged in axial extension of the shaft (9) and axially outside the NDE bearing.

Inventors

  • KROMPASKY, ERIK

Assignees

  • Innomotics GmbH

Dates

Publication Date
20260513
Application Date
20241108

Claims (13)

  1. Dynamoelectric machine (1) with a stator (2) which is arranged in a frame (26) whose frame openings (27) can be closed section by section at least on one side, a winding system which is arranged in axially extending slots of the stator (2) and which forms winding heads (6) on the end faces of the stator (2), a rotor (11) which is arranged coaxially to the stator (2) and spaced apart from the stator (2) by an air gap (8), wherein the rotor (11) is rotatably held by DE and NDE bearings arranged in the frame (26), a top-mounted cooler (18) which is arranged on one side of the frame (26) and corresponds fluidically to the frame openings (27) via top-mounted cooler openings (28), such that cooling circuits (22, 23) of a cooling system can be adjusted, which forms at least a primary circuit (22) and optionally a secondary circuit (23) each by means of guide elements (29), at least one fan arrangement (19,24) axially outside a frame (26) which is arranged in axial extension of the shaft (9) and axially outside the NDE bearing.
  2. Dynamoelectric machine (1) according to claim 1, characterized in that the fan arrangement has at least one fan (19).
  3. Dynamoelectric machine (1) according to claim 1 or 2, characterized in that the at least one fan (19) of the fan arrangement is a radial fan.
  4. Dynamoelectric machine (1) according to one of the preceding claims, characterized in that the secondary cooling system (23) is designed as a plate cooler or tube cooler.
  5. Dynamoelectric machine (1) according to one of the preceding claims, characterized in that the primary cooling circuit (22) is designed as X or Z ventilation.
  6. Dynamoelectric machine (1) according to one of the preceding claims, characterized in that the fans (19, 24) of the fan arrangement are designed as intrinsic fans and/or external fans.
  7. Dynamoelectric machine (1) according to one of the preceding claims, characterized by the fact that the dynamoelectric machine (1) has a comparatively large number of pole pairs.
  8. Dynamoelectric machine (1) according to one of the preceding claims, characterized in that at least one bypass device (21) runs within the top cooler (18) as a distribution channel to the DE side within the secondary cooler (23) or top cooler (18), which is designed in particular as a central channel and/or side channels and which has bypass openings (31) opposite on the DE side, which lead, inter alia, into the space of the winding head (6) on the DE side.
  9. Dynamoelectric machine (1) according to one of the preceding claims, characterized in that X or Z ventilation of the primary circuit (22) can be adjusted via cover plates (20) and/or air guide elements (29), in particular at the top cooler openings (28) and/or frame frame openings (27).
  10. Dynamoelectric machine (1) according to one of the preceding claims, characterized in that the radial extent of at least one radial fan, in particular the radial intrinsic fan, is greater than the radial extent of the frame (26).
  11. Dynamoelectric machine (1) according to one of the preceding claims, characterized in that the fan arrangement has sound-insulating material (25).
  12. Dynamoelectric machine (1) according to one of the preceding claims, characterized in that the dynamoelectric machine (1) has a rotor (11) which is equipped as a squirrel-cage rotor or salient-pole rotor or permanent magnet rotor.
  13. Use of a dynamoelectric machine (1) according to one of the preceding claims in industrial applications and in mining in compressors, blowers, fans and pumps.

Description

The invention relates to a dynamo-electric machine with a cooling system. Dynamoelectric machines generate losses during their operation, which must be dissipated to ensure proper operation of the dynamoelectric machine. To dissipate the losses, various cooling principles with a wide variety of cooling media are used, such as gas, especially air, or liquids, especially water. For cooling dynamoelectric machines, mainly shaft-mounted (self-ventilation) or external fans (external ventilation) are used. Slow-running dynamoelectric machines are usually cooled by fans with a comparatively large diameter, which are located inside the housing of the dynamoelectric machines on the DE or NDE side and are directly coupled to the shaft. In closed dynamo-electric machines, there is an internal closed cooling circuit (primary circuit) in which air or another cooling medium is circulated. This cooling medium from the primary circuit can be recooled in a heat exchanger (secondary circuit). Based on this, the invention aims to provide an efficient cooling system, in particular a closed dynamoelectric machine. The problem can be solved by the characteristics of an independent claim. Advantageous configurations can be found in the dependent claims. In the dynamoelectric rotary machine according to the invention, which has a stator arranged in a frame, the frame openings can be partially closed at least on one side. On the other sides, these openings are generally closed, e.g., by means of sheet metal elements, thus forming a closed or partially closed housing. The stator, which comprises a laminated core, is equipped with a winding system arranged in axially extending grooves of the stator's laminated core and forming winding heads at the stator's end faces. These winding heads are positioned by arranging the stator, preferably within the frame, in a section of the frame that is advantageously designed from a flow perspective. A rotor, arranged coaxially to the stator and spaced from it by an air gap, is rotatably mounted via DE and NDE bearings located in the frame. The rotor has a laminated core that is non-rotatably connected to a shaft. The rotor can be designed as a squirrel-cage rotor or as a rotor equipped with permanent magnets. The laminated cores of the stator and/or rotor can each have axially and/or radially extending cooling channels. A top-mounted cooler is provided on the side of the frame where the open frame openings are located. The frame openings correspond to the top-mounted cooler openings arranged on one side of the cooler, such that cooling circuits of a cooling system for the dynamo-electric machine can be adjusted, the cooling system forming a primary circuit and a secondary circuit. The frame openings and the top-mounted cooler openings face each other. A fan assembly is arranged axially outside a frame, in axial extension of the shaft and axially outside the NDE bearing. In a dynamo-electric rotary machine, such as a motor, there is an A-side (drive end; DE side), one end of which has output elements and/or a driven machine (generally shaft attachments) and can be mechanically coupled to these directly or indirectly. The B-side ( non - drive end ; NDE side) of the motor is located at the other axial shaft end and faces away from the DE side. The primary circuit, regardless of whether the ventilation is one- or two-sided (Z- or X-ventilation), refers to a gaseous cooling flow, in particular an air flow or air flow distribution, within the dynamo-electric machine. This flow passes over and/or around and/or through components of the machine, including the stator, short-circuit rings of the rotor, magnetically conductive bodies of the stator and/or rotor (e.g., laminated cores or partial laminated cores), conductors, at least housing sections, bearing shields and bearings. It is designed as a closed circuit (internal cooling circuit) that has no flow-related contact with the outside. The airflow of the primary circuit is generated by one or more in-house fans and/or external fans by pushing or sucking outside the housing of the dynamo-electric machine. A secondary circuit is a cooling flow, liquid cooling flow (e.g. based on water) or gaseous cooling flow (e.g. based on air) in the top-mounted cooler, which is thermally coupled to the cooling flow of the primary circuit, i.e., can cool it back down, whereby the cooling flow or cooling flow distribution, in particular air of the secondary circuit, is generated by internal and/or external fans or corresponding pumps under pushing or suction conditions. Preferably, the secondary circuit is open, meaning it is operated with ambient air, which is drawn in from the surroundings, heated by the medium of the primary circuit, and then released back into the environment. This allows a dynamo-electric machine equipped with such a top-mounted cooler to be installed in almost any location. Filter mats or air filters for heavily contaminated air may need to be insta