Electric motor inverter

• US 10,362,703 B2
• Filed: 04/09/2018
• Issued: 07/23/2019
• Est. Priority Date: 10/09/2015
• Status: Active Grant

• Current Assignee: Vitesco Technologies Germany GmbH (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: CPT Zwei GmbH (Continental AG)
• Inventors: Blosch, Christoph, Toberer, Bjoern
• Primary Examiner(s): Wu, Jerry
• Application Number:
  US15/947,989
• Publication Number:
  US 20180228048A1
• Time in Patent Office: 470 Days
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H05K 5/0217 Mechanical details of casings covers, lids, hoods or members for covering apertures H05K5/03
• CPC Class Codes: H05K 7/1432 specially adapted for power drive units or power converters
• CPC Class Codes: H05K 7/14322 wherein the control and power circuits of a power converter are arranged within the same casing
• CPC Class Codes: H05K 7/2039 characterised by the heat transfer by conduction from the heat generating element to a dissipating body arrangements for increasing/decreasing heat-transfer, e.g. fins details, F28F13/00
• CPC Class Codes: H05K 7/2089 for power electronics, e.g. for inverters for controlling motor
• CPC Class Codes: H05K 7/20927 Liquid coolant without phase change

Abstract

An electric motor inverter includes at least one DC-link capacitor that has contacting layers. The electric motor inverter also includes circuit breakers which are mounted on at least one substrate, and capacitor connecting plates which are attached with first sections to the contacting layers. Second sections of the capacitor connecting plates which are arranged opposite the first sections are attached to the at least one substrate.

Claims

1. An electric motor inverter comprising:

at least one DC-link capacitor having contacting layers;

circuit breakers mounted on at least one substrate; and

capacitor connecting plates having first sections and second sections, the first sections attached to the contacting layers, the second sections arranged opposite the first sections and attached to the at least one substrate; and

a baseplate, wherein the second sections of the DC-link capacitor and the substrate are attached one next to the other on the baseplate;

a heatsink which is at least partially let into a cutout in the baseplate, and which has a rear side on which the substrate is attached, the baseplate includes a cover plate which closes off the cutout in a seal-forming manner on the same side of the baseplate which is arranged opposite the substrate, with the result that a fluid-tight cooling duct is produced between the front side of the heatsink and the cover plate.

2. The electric motor inverter of claim 1, wherein the capacitor connecting plates have sections at which they lie one on top of the other and are isolated from one another by an insulation layer.

3. The electric motor inverter of claim 1, further comprising:

a baseplate, wherein the DC-link capacitor and the substrate are attached one next to the other on the baseplate.

4. The electric motor inverter of claim 3, wherein the heatsink includes cooling pins or cooling fins which extend in the cutout from a front side, arranged opposite the rear side, of the heatsink.

5. The electric motor inverter of claim 1, wherein the DC-link capacitor is arranged in a metal housing which is adjoined by arms which extend from the metal housing over at least one section of the substrate and are connected in a force-transmitting fashion to the substrate.

6. The electric motor inverter of claim 1, further comprising a driver circuit board which has a driver circuit for the circuit breakers arranged downstream, wherein the driver circuit board extends along the substrate with a perpendicular offset with respect thereto, and wherein the driver circuit board is secured on a carrier plate.

7. The electric motor inverter of claim 6, wherein at least one cutout, through which at least one press-fit connection extends from the driver circuit board to the substrate, is positioned in the carrier plate on which the driver circuit board is secured.

8. The electric motor inverter of claim 6, further comprising:

a control circuit board, downstream of which the driver circuit board is arranged, wherein the control circuit board extends along the substrate, with a perpendicular offset with respect thereto, and the driver circuit board and the control circuit board are stacked one on top of the other and are spaced apart from one another, and wherein the control circuit board is secured on a further carrier plate.

9. The electric motor inverter of claim 8, wherein the control circuit board by at least one first screwed connection is secured on the driver circuit board by at least one first screwed connection, and the control circuit board is secured by second screwed connections, directly on a baseplate on which the DC-link capacitor and the substrate are arranged one next to the other, wherein the at least one first screwed connection is located in the center between two of the screwed connections.

10. The electric motor inverter of claim 1, further comprising an EMC filter arranged on one side of the DC-link capacitor and which is arranged offset along the contacting layers.