Abstract

The reliability of PMSM drives has been dealt with an important factor in industrial applications requiring a precise operation and high-performance. This paper proposes the fault diagnosis for open-phase faults of PMSM drives using an Extended Kalman Filter (EKF) and DC-link current information. The proposed fault diagnosis can be achieved without additional devices and distinguish where the open-phase fault occurs between PMSM and power electronic equipment. the feasibility of the proposed fault diagnosis scheme is proved by Simulation results.

Introduction

Permanent magnet synchronous motors (PMSMs) are widely used in many applications such as electrical vehicles, appliances, aircraft, and industrial servo drives. The reliability of PMSM drives has been dealt with an important factor in industrial applications requiring precise operation and high performance. There are many diverse faults occurred in PMSM drives. Electrical faults of PMSM drives are frequently occurred in PMSM and power electronics equipment connected to the PMSM. Faults in a PMSM are resulted from open and short phase faults of stator windings, rotor faults, or bearing faults. Faults in power electronics equipment are occurred by open-circuit and short-circuit faults in power devices and connection wires. The reliability of PMSM drives can be improved by the development of fault diagnosis schemes for these faults. In recent years, many different fault diagnosis schemes have been developed and published in papers. Several papers for faults in PMSM drives have been published for the following fault types: rotor faults[1-3] and stator faults[4-5] in PMSM, and open-circuit faults[6] and short-circuit faults[7] in an inverter.