Device for voltage equalization in square wave voltages for an electric motor

Patent metadata

Field	Value
Publication number	US-12348100-B2
Application number	US-202017774320-A
Country	US
Kind code	B2
Filing date	Oct 9, 2020
Priority date	Nov 5, 2019
Publication date	Jul 1, 2025
Grant date	Jul 1, 2025

Abstract

Various embodiments of the teachings herein include an apparatus for voltage equalization in square-wave voltages of electric motors. The apparatus may include: a terminal board circuit wherein phases U, V, and W each comprises input and output cabled conductors summing to at least 6 cables; and a bridge between two of the at least six cables connecting two or more of the at least 6 cable inputs and outputs. The bridge is partially conductive such that its electrical resistance markedly reduces above a threshold value. The partial conductivity results from filler particles in an embedding matrix determining a reduction of the resistance in the bridge above the threshold value.

First claim

What is claimed is:

1. An apparatus for voltage equalization in square-wave voltages of electric motors, the apparatus comprising:
a terminal board circuit wherein phases U, V, and W each comprises input and output cabled conductors summing to at least 6 cables; and
a bridge between two of the at least six cables connecting two or more of the at least 6 cable inputs and outputs;
wherein the bridge is partially conductive such that its electrical resistance markedly reduces above a threshold value;
wherein the partial conductivity results from filler particles in an embedding matrix determining a reduction of the resistance in the bridge above the threshold value.

2. The apparatus as claimed in claim 1 , wherein the filler particles are embedded in a polymeric and/or ceramic matrix.

3. The apparatus as claimed in claim 1 , wherein at least some of the filler particles have a partially conductive coating.

4. The apparatus as claimed in claim 3 , wherein the partially conductive coating comprises a doped material.

5. The apparatus as claimed in claim 3 , wherein a thickness of the partially conductive coating of the filler particles is in a range from 10 nm to 100 nm.

6. The apparatus as claimed in claim 1 , wherein at least one fraction of the filler particles comprises hollow filler particles having a partially conductive coating.

7. The apparatus as claimed in claim 1 , further comprising a substrate including wood, pressboard, plastic, epoxy resin, polysiloxane, thermoplastic, fiber-reinforced plastic, ceramic, and/or leather, and carrying the embedding matrix and filler particles.

8. The apparatus as claimed in claim 7 , further comprising a lacquer applied to the substrate in a film thickness in a range between 10 μm and 3 mm.

9. The apparatus as claimed in claim 1 , wherein the embedding matrix comprises a lacquer with the filler particles.

10. The apparatus as claimed in claim 9 , wherein the lacquer comprises a resin or a resin mixture with a compound selected from the group consisting of: epoxy resin, polyetherimide, polysiloxane, and polysilazane.

11. The apparatus as claimed in claim 1 , wherein the filler particles comprise at least one material selected from the group consisting of: a metal oxide, a metal carbide, and a metal nitride.

12. The apparatus as claimed in claim 11 , wherein the filler particles comprise an oxide and/or a carbide including at least one element selected from the group consisting of: tin, zinc, iron, molybdenum, bismuth, lead, chromium, manganese, nickel, cobalt, titanium, vanadium, indium, zirconium, tungsten, silicon, antimony, tellurium, and germanium.

13. The apparatus as claimed in claim 1 , wherein the filler particles are present in the embedding matrix in a concentration of 0.5% by volume to 30% by volume.

14. The apparatus as claimed in claim 1 , wherein the filler particles have a size in a range from 500 nm to 50 μm.

15. The apparatus as claimed in claim 1 , wherein the filler includes two or more filler fractions.

Assignees

• Innomotics Gmbh

Inventors

• Katzenberger Tobias
• Plochmann Bastian

Classifications

• C09D5/24

  Electrically-conducting paints {(conductive materials H01B1/00)} · CPC title

• C08K2201/011

  Nanostructured additives · CPC title

• C08K2201/005

  Additives being defined by their particle size in general · CPC title

• C08K2201/001

  Conductive additives · CPC title

• C08K9/00

  Use of pretreated ingredients · CPC title