Methods and systems for performing fault diagnostics for rotors of electric motors
First Claim
1. A method for fault diagnosis for a rotor of an electric motor, the electric motor also having a stator, the method comprising the steps of:
- generating, via a processor, a measured motor current for the stator;
determining, via the processor, a resolver angle of the rotor;
determining, via the processor, a flux angle of the rotor;
calculating, via the processor, a transformation angle using the resolver angle and the flux angle;
conducting, via the processor, a transformation of the motor current using the transformation angle; and
identifying, via the processor, a fault condition based on the transformation.
8 Assignments
0 Petitions
Accused Products
Abstract
A method for fault diagnosis for a rotor of an electric motor, the electric motor also having a stator, includes the steps of generating, via a processor, a measured motor current for the stator, determining, via the processor, a resolver angle of the rotor, determining, via the processor, a flux angle of the rotor, calculating, via the processor, a transformation angle using the resolver angle and the flux angle, conducting, via the processor, a transformation of the motor current using the transformation angle, and identifying, via the processor, a fault condition based on the transformation.
80 Citations
20 Claims
-
1. A method for fault diagnosis for a rotor of an electric motor, the electric motor also having a stator, the method comprising the steps of:
-
generating, via a processor, a measured motor current for the stator; determining, via the processor, a resolver angle of the rotor; determining, via the processor, a flux angle of the rotor; calculating, via the processor, a transformation angle using the resolver angle and the flux angle; conducting, via the processor, a transformation of the motor current using the transformation angle; and identifying, via the processor, a fault condition based on the transformation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method for fault diagnosis for a rotor of an electric motor, the electric motor also having a stator, the method comprising the steps of:
-
generating, via a processor, a measured motor current for the stator; determining, via the processor, a resolver angle of the rotor; determining, via the processor, a flux angle of the rotor; calculating, via the processor, a first transformation angle using the resolver angle, the flux angle, or both; subtracting, via the processor, the resolver angle from the flux angle, to thereby generate a slip angle; calculating, via the processor, a second transformation angle using the slip angle and the flux angle; conducting, via the processor, a first transformation of the motor current using the first transformation angle, to thereby generate a first fault component; conducting, via the processor, a second transformation of the motor current using the second transformation angle, to thereby generate a second fault component; calculating, via the processor, a fault index using the first fault component and the second fault component; and identifying, via the processor, a fault condition using the fault index. - View Dependent Claims (15, 16, 17)
-
-
18. An electrical system for use in a vehicle, the electrical system comprising:
-
an electric motor having a rotor and a stator; an energy source; an inverter module coupled between the energy source and the stator, the inverter module being configured to provide a commanded voltage from the energy source to a stator of the electric motor; a current sensor coupled between the inverter module and the stator, the current sensor being configured to measure current through the stator, resulting in measured current; and a control module coupled to the inverter module and the plurality of current sensors, the control module being configured to; generate a measured current for the stator; determine a resolver angle of the rotor; determine a flux angle of the rotor; calculate a first transformation angle using the resolver angle, the flux angle, or both; subtract the resolver angle from the flux angle, to thereby generate a slip angle; calculate a second transformation angle using the slip angle and the flux angle; conduct a first transformation of the motor current using the first transformation angle, to thereby generate a first fault component; conduct a second transformation of the motor current using the second transformation angle, to thereby generate a second fault component; calculate a fault index using the first fault component and the second fault component; and identify a fault condition using the fault index. - View Dependent Claims (19, 20)
-
Specification