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US 2018/0294751 A1Published application
Apparatus, system and method of fault diagnosis for permanent magnet motor
AssigneeKorea Electronics Technology Institute
InventorsJoonsung PARK, Jinhong KIM, Byongjo HYON, Junhyuk CHOI
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Abstract
Disclosed are an apparatus, system and method for detecting, based on a mathematical model, a fault of a permanent magnet motor driven by a square wave. A fault diagnosis apparatus for the permanent magnet motor includes a current voltage measurement unit, a phase shift time calculation unit, and a control unit.
Claims10
A fault diagnosis apparatus for a permanent magnet motor, the apparatus comprising:
- a current voltage measurement unit configured to measure an input current and an input voltage of an inverter connected to the permanent magnet motor driven by a square wave;
- a phase shift time calculation unit configured to calculate a phase shift time between start and end of a phase shift in the permanent magnet motor;
- and
- a control unit configured to calculate an inductance of each phase with respect to a stator of the permanent magnet motor by using the input current and the input voltage measured by the current voltage measurement unit and the phase shift time calculated by the phase shift time calculation unit, to compare the calculated inductance of each phase with a reference inductance of each phase, and to determine whether a fault occurs in the permanent magnet motor.
1 more element
A fault diagnosis system for a permanent magnet motor, the system comprising:
- the permanent magnet motor driven by a square wave;
- an inverter including a plurality of switching devices connected to each other through a three-phase bridge, and configured to output an output current and an output voltage to the permanent magnet motor according to on/off states of the plurality of switching devices;
- and
- a fault diagnosis apparatus including:
- a current voltage measurement unit configured to measure an input current and an input voltage of the inverter,
- a phase shift time calculation unit configured to calculate a phase shift time between start and end of a phase shift in the permanent magnet motor, and
- a control unit configured to calculate an inductance of each phase with respect to a stator of the permanent magnet motor by using the input current and the input voltage measured by the current voltage measurement unit and the phase shift time calculated by the phase shift time calculation unit, to compare the calculated inductance of each phase with a reference inductance of each phase, and to determine whether a fault occurs in the permanent magnet motor.
4 more elements
A fault diagnosis method for a permanent magnet motor, the method comprising:
- at a fault diagnosis apparatus, measuring an input current and an input voltage of an inverter connected to the permanent magnet motor driven by a square wave;
- at the fault diagnosis apparatus, calculating a phase shift time between start and end of a phase shift in the permanent magnet motor;
- at the fault diagnosis apparatus, calculating an inductance of each phase with respect to a stator of the permanent magnet motor by using the input current and the input voltage measured by the current voltage measurement unit and the phase shift time calculated by the phase shift time calculation unit;
- and
- at the fault diagnosis apparatus, determining whether a fault occurs in the permanent magnet motor, by comparing the calculated inductance of each phase with a reference inductance of each phase.
2 more elements
Dependencies are inferred from the claim text.