System for detecting failures on a linear motor track
US10585145B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2017 |
| Grant date | Mar 10, 2020 |
| Priority date | — |
| Expiry date | Jul 7, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Sections of a linear motor track can each include a single power sensor configured to detect a power current in an erroneous state and one or more reference sensors configured to detect reference currents in erroneous states. The power sensor can be arranged between multiple drive coils of a section and a DC power rail (or “mid-bus”) for the drive coils. The power sensor can produce a single isolated output to a processor for the section, and the processor, in turn, can compare the output to a threshold for determining an error. The one or more reference sensors can be arranged between lower switches and a DC-reference bus, thereby providing a DC-referenced sensing signal for the drive coil currents. By referencing the processor to the same rail as the DC-referenced current sensing circuit, the reference sensors can produce outputs to the processor without any need for isolation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.