Inverter motor, inverter and heat sink

Abstract

Inverter motor, comprising an electric motor and an inverter connected thereto, wherein a terminal box base is screwed onto the electric motor, onto which a converter is placed and connected, in particular screwed, wherein the converter comprises a printed circuit board on which an electronic circuit is arranged, also comprising a connector part and a power semiconductor, wherein the printed circuit board is connected to a cover part, in particular screw-connected and / or materially connected by means of a casting compound, wherein the cover part is placed and connected, in particular screw-connected, on the side of the terminal box base facing away from the motor, wherein the cover part projects laterally beyond the terminal box base, in particular in the direction of the motor axis, wherein a mating connector part is arranged in the terminal box base, so that the converter can be plugged in, in particular when placed on the terminal box base, wherein the power semiconductors are connected to a heat sink for heat dissipation, which is connected to the laterally projecting portion of the cover part, wherein the heat sink has cooling elements, such as cooling fins or cooling fingers, and a first part of the cooling elements is arranged on the side of the heat sink facing the motor, characterized in that a second part of the cooling elements is arranged on the side of the heat sink facing away from the motor, wherein the second part at least partially surrounds the cover part in a C-shape or U-shape, wherein the cover part has groove-shaped recesses which extend towards the heat sink.

Description

[0001] The invention relates to an inverter motor, an inverter for an inverter motor and a heat sink.

[0002] It is well known that inverter motors have an inverter connected to an electric motor.

[0003] The closest state of the art known from DE 298 80 014 U1 is an electric motor with an upstream frequency converter.

[0004] A device is known from DE 10 2005 037 488 A1.

[0005] The invention is therefore based on the object of further developing an inverter motor with regard to higher cooling performance.

[0006] According to the invention, the object is achieved in the converter motor according to the features specified in claim 1, the converter according to the features specified in claim 9 and the heat sink according to the features specified in claim 10.

[0007] Important features of the invention in the converter motor, comprising an electric motor and a converter connected thereto, are that a terminal box base is screw-connected to the electric motor, onto which a converter is placed and connected, in particular screw-connected, wherein the converter comprises a printed circuit board on which an electronic circuit is arranged, also comprising a connector part and a power semiconductor, wherein the circuit board is connected to a cover part, in particular screw-connected and / or materially connected by means of a casting compound, wherein the cover part is placed and connected, in particular screw-connected, on the side of the terminal box base facing away from the motor, wherein the cover part projects laterally beyond the terminal box base, in particular in the direction of the motor axis, wherein a mating connector part is arranged in the terminal box base, so that the converter can be plugged in, in particular when placed on the terminal box base, wherein the power semiconductors are connected to a heat sink for heat dissipation, which is connected to the laterally projecting portion of the cover part, wherein the heat sink has cooling elements, such as cooling fins or cooling fingers, and a first part of the cooling elements is arranged on the side of the heat sink facing the motor and a second part of the cooling elements is arranged on the side of the heat sink facing away from the motor, wherein the second part at least partially surrounds the cover part in a C-shape or U-shape.

[0008] The advantage here is that, on the one hand, the converter can be cooled passively, i.e. without actively driven fan current, regardless of installation position. On the other hand, a cost-effective, simple design is possible because the heat sink surrounds the cover section with the additional cooling elements, thus achieving highly effective heat dissipation with only a small amount of additional installation space. In particular, the cooling elements are characterized by the fact that they are raised and thin in such a way that a large surface area per volume can be achieved. The arrangement of the cooling fingers in a U-shaped area at the edge of the cover section allows water to drain away from the cover section and is not trapped by cooling fins or the like.

[0009] In an advantageous design, a grounding cable can be electrically connected to the base of the junction box. This has the advantage of increasing safety.

[0010] In an advantageous embodiment, an electronic circuit for controlling the brake is arranged in the terminal box base. The electronic circuit is connected to the electronic circuit of the converter by means of a cable, in particular a control cable, via a plug connection formed by the connector part and the mating connector part. This is advantageous in that it enables easy maintenance or replacement of the converter.

[0011] In an advantageous embodiment, the cover part is made of plastic or metal. This offers the advantage of cost-effective protection. Furthermore, the signal electronics can be cooled to the environment via the cover part.

[0012] In an advantageous embodiment, the cover part has fewer surface-enlarging formations or cooling elements than the heat sink, in particular such that the volume-to-surface ratio is at least twice that of the heat sink, in particular at least five times that. This is advantageous in that high cooling performance can be achieved.

[0013] In an advantageous embodiment, the edge area of ​​the cover section, surrounded by the second part in a U-shaped frame, extends laterally beyond the terminal box base. This is advantageous because the heat sink is positioned laterally, thus enabling a compact design of the inverter motor. In particular, the heat sink only requires space in the lateral extension of the terminal box base and the cover section mounted on it. No additional space is required upwards, i.e., on the side of the cover section facing away from the motor.

[0014] According to the invention, the cover part has groove-shaped recesses that extend toward the heat sink. This is advantageous because it allows liquid to collect and drain away. This is particularly important for use in wet areas.

[0015] In an advantageous embodiment, the cover part has a curve on its elongated upper side, allowing fluid to drain in any installation position, particularly via the groove-shaped recesses to or from the heat sink. This allows for any installation position, allowing not only fluids to drain in any case, but also enabling passive convective cooling.

[0016] Key features of the converter include its design for a previously described converter motor. This means the converter is equipped with a cooling arrangement that is efficient not only in various mounting positions, but also in wet areas.

[0017] The advantage is that it can be used in a variety of ways.

[0018] Important features of the heat sink for an inverter motor are that it has a base plate on the underside of which cooling fingers are provided, in particular cooling fingers arranged regularly over the entire underside, wherein further cooling fingers are arranged on the upper side of the base plate in a U-shaped edge area of ​​the upper side, in particular wherein the cooling fingers each extend in the normal direction of the respective side of the base plate, in particular, wherein on the upper side an area spaced from the U-shaped edge area is formed as a contact surface for the introduction of the heat of the power semiconductors.

[0019] The advantage here is that the cooling fingers extend from the board on both sides, but with a smooth area on the top for conducting the heat to be dissipated into the environment. The cooling fingers therefore extend only into the ambient air, not into the converter, and especially not into the space surrounding the circuit board.

[0020] Alternatively, cooling fingers extend into the space of the electronic circuit, in particular as close as possible to heat-generating components, so that their heat can be absorbed directly and dissipated to the environment via the heat sink.

[0021] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0022] The invention will now be explained in more detail with the aid of illustrations: As in the Fig.1 as an exploded view, a converter 490 is mounted on a terminal box base 481 and screwed into place. The terminal box base 481 is screwed onto a motor housing part (not shown) of an electric motor. This motor housing part has a recess for the passage of electrical cables, such as stator winding cables. A seal 480 is provided for a tight connection to this recess. The terminal box base is screwed into the motor housing part.

[0023] For the passage of supply lines and, if necessary, data bus lines, plug screws 488 and 491, which are preferably made of plastic, are provided in the wall of the terminal box base 481. The wall of the terminal box base is made of metal, preferably aluminum or steel.

[0024] In the terminal box lower part, a control electronics 136 for brake, in particular comprising a rectifier, is accommodated, whereby a brake installed or attached in or on the motor can be supplied and / or controlled.

[0025] Also arranged in the terminal box base are the connecting cables 495 for connecting the cables connected to the terminal board (not shown) with the connector base 493, which is arranged on a printed circuit board by soldering.

[0026] In addition, a grounding terminal 484 is located in the terminal box base, which is intended for connecting a grounding wire. This grounds the inverter motor and ensures safe operation.

[0027] An electronic memory card (948), specifically a memory card, is plugged into the bottom of the 490 inverter. This allows the inverter's parameter settings to be saved in the memory and transferred to other inverters. This allows for particularly quick and easy parameterization.

[0028] In addition, a braking resistor 478 is thermally connected to the terminal box base for dissipating excess regenerative power from the motor to the environment in the form of heat. Therefore, the terminal box base is preferably made of a good heat conductor, such as aluminum.

[0029] The inverter's heat sink is located on a section of the inverter that extends laterally beyond the terminal box base, i.e., in the direction of the motor axis. It has cooling fins directed toward the motor on one side and cooling fins oriented in the opposite direction, i.e., upwards in the figure. This is the direction away from the motor.

[0030] These upward-facing cooling fingers are arranged in a U-shaped area and form the edge area around the inverter cover. This allows the inverter to dissipate heat as effectively as possible, particularly passively (i.e., purely convective), in all installation positions within a system. Thus, the motor, and especially the inverter, does not require a fan. List of reference symbols 136 Control electronics for brake, in particular comprising rectifier 229 adapters 268 adapters 478 PTC resistor 479 Screw 480 Seal for lower part 481 Terminal box base 484 Earthing terminal 486 lens-head screw 487 Hexagon screw 488 locking screw 490 inverters 491 locking screw 493 Connector base 494 lens-head screw 495 connecting cables 531 locking screw 532 Seal, especially O-ring 534 Seal, especially O-ring 759 Single-core cable 761 single-core cable 812 cable ties 818 single-core cable 948 electronic memory, in particular memory card

Claims

[1] Inverter motor, comprising an electric motor and an inverter connected thereto, wherein a terminal box base is screwed onto the electric motor, onto which a converter is placed and connected, in particular screwed, wherein the converter comprises a printed circuit board on which an electronic circuit is arranged, also comprising a connector part and a power semiconductor, wherein the printed circuit board is connected to a cover part, in particular screw-connected and / or materially connected by means of a casting compound, wherein the cover part is placed and connected, in particular screw-connected, on the side of the terminal box base facing away from the motor, wherein the cover part projects laterally beyond the terminal box base, in particular in the direction of the motor axis, wherein a mating connector part is arranged in the terminal box base, so that the converter can be plugged in, in particular when placed on the terminal box base, wherein the power semiconductors are connected to a heat sink for heat dissipation, which is connected to the laterally projecting portion of the cover part, wherein the heat sink has cooling elements, such as cooling fins or cooling fingers, and a first part of the cooling elements is arranged on the side of the heat sink facing the motor, characterized by , that a second part of the cooling elements is arranged on the side of the heat sink facing away from the motor, wherein the second part at least partially surrounds the cover part in a C-shape or U-shape, wherein the cover part has groove-shaped recesses which extend towards the heat sink. [2] Inverter motor according to claim 1, characterized bythat an earth cable can be electrically connected to the lower part of the junction box. [3] Inverter motor according to at least one of the preceding claims, characterized by that an electronic circuit for controlling the brake is arranged in the terminal box lower part, wherein the electronic circuit is connected to the electronic circuit of the converter by means of a cable, in particular a control cable, via the plug connection formed by the plug connector part and the mating plug connector part. [4] Inverter motor according to at least one of the preceding claims, characterized by that the cover part is made of plastic or metal. [5] Inverter motor according to at least one of the preceding claims, characterized bythat the cover part has fewer surface-enlarging formations or cooling elements than the heat sink, in particular such that the volume to surface ratio is at least twice that of the heat sink, in particular at least five times that. [6] Inverter motor according to at least one of the preceding claims, characterized by that the edge area of ​​the cover part, which is surrounded by the second part in a U-shape, projects laterally beyond the terminal box base. [7] Inverter motor according to at least one of the preceding claims, characterized by that the cover part has a curve on its elongated upper side so that liquid flows away in any installation position. [8] Inverter motor according to claim 7, characterized by that the liquid flows to or from the heat sink via the groove-shaped recesses. [9] Converter for an inverter motor according to at least one of the preceding claims. [10] Heat sink for an inverter motor according to at least one of the preceding claims, wherein the heat sink has a base plate on the underside of which cooling fingers are provided, in particular cooling fingers arranged regularly over the entire underside, wherein further cooling fingers are arranged on the upper side of the base plate in a U-shaped edge area of ​​the upper side, in particular wherein the cooling fingers each extend in the normal direction of the respective side of the base plate, in particular, wherein on the upper side an area spaced from the U-shaped edge area is formed as a contact surface for the introduction of the heat of the power semiconductors.

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