Search

EP-4098088-B1 - DRIVING MECHANISM COMPRISING A RECTIFIER

EP4098088B1EP 4098088 B1EP4098088 B1EP 4098088B1EP-4098088-B1

Inventors

  • MAYER, RALPH
  • DAMINGER, FRANZ

Dates

Publication Date
20260513
Application Date
20201201

Claims (13)

  1. Drive comprising a converter, wherein the converter has a bottom part (60) and a cover part (2) mounted thereon, wherein a cooling member (3) at least partly encompasses the cover part (2) and has leg regions (51, 70), which are spaced apart from one another, and a yoke region (50), which is connected to each of the leg regions (51, 70), wherein the yoke region (50) at least partly covers a first side of the cover part (2), and each leg region (51, 70) at least partly covers a different side of the cover part (2) in each case, wherein a thermal barrier is arranged between the cooling member (3) and the cover part (2), wherein each of the leg regions (51, 70) at least partly covers a side of the cover part (2) that is different from the first side and the sides covered by the other leg regions (51, 70), i.e. each of the leg regions (51, 70) at least partly covers a different side of the cover part (2) in each case, wherein the thermal barrier comprises an insulation means (4) which is arranged on a surface region of the cooling member (3) facing the cover part (2), wherein the bottom part (60) and the cover part (2) connected to the bottom part (60) enclose a spatial region in which there is arranged a circuit board arrangement (5) to which at least one heat-generating component of signal electronics of the converter and also a power module (6) of the converter are fitted, wherein the power module (6) is connected in a heat-conducting manner to the cooling member (3), and the component is connected in a heat-conducting manner to the cover part (2), wherein filling material (1) is arranged between the cover part (2) and the at least one heat-generating component arranged on a circuit board of the circuit board arrangement (5) and is integrally bonded to both the component and the cover part (2), wherein the filling material (1) has ceramic particles and is heat-conductive, wherein the cover part (2) has a cut-out through which the power module (6) and the cooling member (3) project, wherein the insulation means (4) has a collar region which extends all around the power module (6) and which adjoins the circuit board, wherein the insulation means (4) is arranged between the cooling member (3) and the cover part (2), wherein the insulation means (4) is both tightly connected to the cooling member (3) and tightly connected to the cover part (2), wherein the insulation means (4) is made of a plastics material and acts as a thermal barrier and/or is made of a highly electrically insulating material.
  2. Drive according to claim 1, characterised in that the drive has an electric motor (61), the yoke region (50) being formed to be substantially planar and at least partly covering the cover part (2) on its side facing away from the electric motor (61).
  3. Drive according to any of the preceding claims, characterised in that the in particular three leg regions (51, 70) are arranged in an angled manner, in particular in a vertically angled manner, on the yoke region (50).
  4. Drive according to any of the preceding claims, characterised in that the yoke region (50) is formed to be substantially planar, and each of the leg regions (51, 70) extends in parallel with the normal direction of the yoke region (50) in each case, in particular towards the electric motor (61).
  5. Drive according to any of the preceding claims but at least comprising the features of claim 2, characterised in that the non-drive end of the cover part (2), i.e. that side of the cover part (2) which is the furthest away from the rotor shaft end protruding out of the stator casing of the electric motor (61) and driving the load, is not covered by the cooling member (3).
  6. Drive according to any of the preceding claims, characterised in that the thermal barrier comprises thermally and electrically insulating layers or materials that are intended for insulating fasteners, the fasteners connecting the cooling member (3) to the cover part (2), the fasteners in particular being screws.
  7. Drive according to any of the preceding claims, characterised in that the thermal conductivity of the filling material (1) differs from the thermal conductivity of thermal paste by less than a factor of 2.
  8. Drive according to any of the preceding claims, characterised in that the filling material (1) is formed in multiple pieces, each filling material piece being assigned, in particular unambiguously assigned, to a particular component, in particular heat-generating component, fitted on the circuit board arrangement (5), in particular on a circuit board of the circuit board arrangement (5), the area of the vertical projection of the filling material piece into the circuit board plane in particular only being less than 50% greater than the area of the vertical projection of the component into the circuit board plane.
  9. Drive according to any of the preceding claims, characterised in that the filling material (1) is formed to be resilient such that the changes in the distance between the cover part (2) and the component which are induced by thermal processes while the converter is in operation can be compensated for within the elastic range of the deformation of the filling material (1), the distance between the cover part (2) and the component in particular being greater than two millimetres, in particular greater than five millimetres.
  10. Drive according to any of the preceding claims, characterised in that thermal paste is arranged between the cooling member (3) and the power module (6).
  11. Drive according to any of the preceding claims, characterised in that the drive has an electric motor (61) on which the converter is arranged.
  12. Drive according to claim 11, characterised in that the cooling member (3) has cooling ribs on its exterior, which are formed on the side of the cooling member (3) facing away from the electric motor (61) in a curved manner such that they extend from one particular side face to at least two other side faces, in particular to three side faces.
  13. Drive according to any of the preceding claims, characterised in that an additional fan is arranged on the cooling member, the air stream conveyed by the fan in particular flowing at least partly along the surface of the cooling member (3).

Description

The invention relates to a drive comprising a converter. It is generally known that a drive system has an electric motor powered by an inverter. From the US 5 901 040 A is known to act as a heat sink and Faraday cage for a semiconductor module. From the US 5 508 908 A A motor control system with a cooling arrangement is known. From the EP 2 270 961 A2 An electric motor with a frequency converter upstream is known. From the DE 10 2008 007 825 A1 A converter motor is known. From the DE 10 2007 014 713 B3 A cooling arrangement is known. From theEP 1 701 431 A1A terminal box for an electric motor is known. From theEP 1 176 706 A2A frequency converter with a housing consisting of an upper part and a lower part is known. From theDE 10 2005 037 488 A1A device is known. The invention is based on the objective of further developing a drive that is as compact as possible and has a long service life. According to the invention, the problem is solved by the features specified in claim 1. An advantage of this design is the efficient heat dissipation. The inverter's power electronics can be cooled via the heat sink, and the signal electronics via the cover. Both the cover and the heat sink are made of metal, preferably aluminum. However, since the heat flow generated by the signal electronics is lower than that of the power electronics, the cover can alternatively be made of cast steel. Due to the large size of the heat sink, which extends over several sides of the cover, efficient heat dissipation is achieved, resulting in a compact inverter design. Furthermore, the heat dissipation of the signal electronics through the cover to the surrounding environment, and the separate heat dissipation of the power module via the heat sink to the surrounding environment, ensures a long service life. This is because the thermal load on the signal electronics components is reduced, thus extending their lifespan. In a preferred embodiment, the yoke area is essentially flat and at least partially covers the cover on the side facing away from the electric motor. It is advantageous that the heat sink, with its yoke area, rests at least partially flush against the cover. This allows for compact heat dissipation. In a preferred embodiment, the three leg sections are angled at the yoke area, particularly at a perpendicular angle. It is advantageous that the leg sections laterally cover at least part of the cover. This enables efficient heat dissipation from the power electronics in various mounting directions. In an advantageous embodiment, each leg extends parallel to the normal direction of the planar yoke area, particularly away from the electric motor. It is advantageous that the cover can be grasped laterally on three sides. This enables efficient heat dissipation. Because a thermal barrier is arranged between the cover and the heat sink, heat dissipation from the heat sink to the environment is possible, with the outer surface of the heat sink being accessible to the environment on several differently oriented sides, while the cover still also has open surface areas facing the environment. A smaller free surface area of the cover is sufficient because the signal electronics generate less heat than the power electronics. The cover does not need to have cooling fins, but the heat sink is preferably designed with cooling fins. According to the invention, each leg section at least partially covers a side of the cover part that differs from the first side and from the sides covered by the other leg sections. An advantage of this is that the leg sections cannot be stacked on top of each other, but rather the cover part is always positioned between each pair of leg sections. Thus, the heat sink surrounds the cover part. The heat sink can therefore only be removed from the cover part in a single direction, perpendicular to the normal direction of the yoke section and opposite to the insertion direction, i.e., parallel to the normal direction of the yoke section. In an advantageous embodiment, the B-side of the cover part, i.e., the side of the cover part which is exposed to the stator housing of the electric motor, is The protruding end of the rotor shaft, which drives the load, is furthest away from the heat sink. An advantage of this is that one side of the cover remains free, thus facilitating easy heat dissipation. According to the invention , the lower part and the cover part connected to the lower part surround a space in which a circuit board arrangement is arranged, which is equipped with at least one heat-generating component, signal electronics of the inverter, and a power module of the inverter. The power module is thermally connected to the heat sink, and the component is thermally connected to the cover. An advantage of this design is that the signal electronics are cooled separately from the power electronics. This allows for different temperature levels, with the signal electronics operating at one temperature level and the po