Method and system for detecting fault of serial coil type permanent magnet motor
First Claim
1. 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.
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Accused Products
Abstract
A method and system for detecting a fault of a serial coil type permanent magnet motor includes driving the motor based on a predefined current reference value, detecting a phase current vector of the motor, and calculating a current compensation value for removing a negative sequence component of the motor based on the phase current vector. The current compensation value is provided to a negative sequence current controller for calculating a faulty phase and a degree of a fault of the motor using the output of the negative sequence current controller and a fault model to which induced magnetic flux variations in a specific slot of a specific faulty phase of the motor and other slots of the same phase as the specific phase are applied, and applying a current reference value to which the calculated faulty phase and degree of fault are applied.
6 Citations
8 Claims
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1. A system supporting detection of a fault of a serial coil type permanent magnet motor, the system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for detecting a fault of a serial coil type permanent magnet motor, the method comprising the steps of:
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driving the serial coil type permanent motor based on a predefined current reference value; detecting a phase current vector of the motor; calculating a current compensation value for removing a negative sequence component of the motor based on the phase current vector; providing the current compensation value to a negative sequence current controller and calculating a faulty phase and a degree of a fault of the serial coil type permanent motor using the output of the negative sequence current controller and a fault model to which induced magnetic flux variations in a specific slot of a specific faulty phase of the serial coil type permanent motor and other slots of the same phase as the specific phase are applied; and applying a current reference value to which the calculated faulty phase and degree of fault are applied. - View Dependent Claims (8)
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Specification