Method and system for detecting fault of serial coil type permanent magnet motor

A system supporting detection of a fault of a serial coil type permanent magnet motor, the system comprising:

• a serial coil type motor;
• a current sensor configured to sense stator phase current of the motor;
• a compensation current calculator configured to calculate a current compensation value for a negative sequence component generated in the motor on the basis of the sensed phase current;
• a positive sequence current controller configured to generate a control signal for an inverter control by using the current compensation value and also using a current reference value provided from a control system;
• a negative sequence current controller configured to generate a signal for removing the negative sequence component by using both the current compensation value and the current reference value, and then to provide the signal to the positive sequence current controller;
• an inverter configured to generate a motor operation signal according to the control signal;
• a fault detector configured to detect a faulty phase and a degree of a fault by applying the output of the negative sequence current controller to a mathematically defined fault model;
• and
• the control system configured to provide the current reference value to which the faulty phase and the degree of fault are applied,
• wherein the fault model of the fault detector is a fault model to which a magnetic flux variation in a specific slot of a specific faulty phase of the motor and an induced magnetic flux variation in a slot of the same phase as the specific phase are applied.