Diagnostic system for electric motor
US6271637A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 2000 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Feb 8, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/343
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A diagnostic system for electric motors, such as those used in automotive applications. The system comprises a controller for supplying a desired command current to said electric motor, a sensor for measuring the rotational speed of the motor, a sensor for measuring the actual current supplied to the motor by the controller, a diagnostic control unit adapted to receive the measured rotational speed, measured supplied voltage, and a command current level value as inputs. The diagnostic control unit further comprises circuitry to calculate an estimated actual current drawn by the motor and to signal an error condition if the estimated actual current is not within a calculated valid range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.