System and method for motor fault detection
First Claim
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1. A system that detects a fault condition in a three-phase motor comprising:
- a power module having a plurality of switches arranged in a three-phase inverter configuration to provide three phase current flow through the motor;
a power line connected to the power module;
a sensor having an input, the input being electrically coupled to the power line;
a filter electrically coupled to an output of the sensor; and
a controller having an input and an output electrically coupled to the filter, in which the output of the controller provides a signal to tune the filter to a rotational frequency of the motor, and the input of the controller receives a signal that identifies a fault condition when compared to a predetermined value by the controller.
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Abstract
A system that detects a motor fault includes a current sensor, a filter, and a controller. The sensor is electrically connected to the filter. A controller tunes the filter to a rotational frequency of a motor and compares a filtered signal to a predetermined value. A method that detects the motor fault condition selects an output signal conditioned by either a band pass filter or a low pass filter and compares the selected output to a predetermined value to identify a motor fault.
87 Citations
30 Claims
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1. A system that detects a fault condition in a three-phase motor comprising:
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a power module having a plurality of switches arranged in a three-phase inverter configuration to provide three phase current flow through the motor;
a power line connected to the power module;
a sensor having an input, the input being electrically coupled to the power line;
a filter electrically coupled to an output of the sensor; and
a controller having an input and an output electrically coupled to the filter, in which the output of the controller provides a signal to tune the filter to a rotational frequency of the motor, and the input of the controller receives a signal that identifies a fault condition when compared to a predetermined value by the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system that detects a fault condition in a three-phase power steering motor comprising:
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a power source having a positive terminal and a negative terminal, the positive terminal and the negative terminal connected to the three-phase power steering motor through a plurality of switches;
a current sensor electrically coupled to between the negative terminal of the power source and the plurality of switches;
a band pass filter electrically coupled to an output of the current sensor; and
a controller having an input and an output electrically coupled to the band pass filter, in which the output of the controller provides a signal to tune the band pass filter to a rotational frequency of the three-phase power steering motor, and the input of the controller receives a signal that when compared to a predetermined value by the controller identifies the fault condition in the three-phase power steering motor. - View Dependent Claims (17, 18, 19)
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20. A method for detecting a fault in a three-phase motor in a vehicle comprising the steps of:
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monitoring a sensor between a the three-phase motor and a direct current power source;
filtering an output signal provided by an output of the sensor by a band pass filter and a low pass filter;
selecting an output signal processed by one of the filters based at least in part on the rotational frequency of the three-phase motor; and
comparing the selected output to a predetermined value to identify when a motor fault occurs. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28. A controller usable medium having a controller readable program code embodied therein to detect a fault condition in a three-phase motor in a vehicle, the controller readable program code comprising:
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a first controller readable code to determine the condition of current flowing through a power line between the three-phase motor and a power source; and
a second controller readable code to indicate when a fault condition occurs in response to an output of the first controller readable code and a predetermined value. - View Dependent Claims (29, 30)
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Specification