Identification of parameters for switched reluctance electric machines
Disclosed herein is a method for parameter identification in a switched reluctance electric machine comprising: operating the switched reluctance electric machine in response to a desired command; and measuring an actual operating characteristic of the switched reluctance electric machine. The method also includes: modeling the switched reluctance electric machine to formulate an estimated operating characteristic based on the desired command; comparing the actual operating characteristic and the estimated operating characteristic to formulate an error there between; and determining a parameter estimate for the switched reluctance machine based on the error and a previous parameter estimate. Also disclosed herein is a system for estimating a parameter for a switched reluctance electric machine comprising: a switched reluctance electric machine including a sensor generating and transmitting a sensor signal indicative of a sensed characteristic; and a controller operatively coupled to the sensors executing the abovementioned methodology.
1. A method for parameter identification in a switched reluctance electric machine comprising:
operating said switched reluctance electric machine in response to a desired command;
measuring an actual operating characteristic of said switched reluctance electric machine;
modeling said switched reluctance electric machine to formulate an estimated operating characteristic based on said desired command;
comparing said actual operating characteristic and said estimated operating characteristic to formulate an error there between; and
determining a parameter estimate for said switched reluctance machine based on said error and a previous parameter estimate.
2. The method of claim 1 further including providing nominal parameters to said modeling.
3. The method of claim 1 further including updating said previous estimate based on said parameter estimate.
4. The method of claim 1 further including controlling said switched reluctance machine based on said parameter estimate.
5. The method of claim 1 wherein said desired command comprises at least one of a current command, a voltage command, and a torque command.
6. The method of claim 1 wherein said actual operating characteristic includes position.
7. The method of claim 1 wherein said modeling comprises a look-up table based on said desired command and said previous parameter estimate.
8. The method of claim 1 wherein said modeling comprises a recursive analytical expression based said desired command and said previous parameter estimate.
9. A system for estimating a parameter for a switched reluctance electric machine comprising:
a switched reluctance electric machine including a sensor generating and transmitting a sensor signal indicative of a sensed characteristic;
a controller operatively coupled to said sensors; and
said controller executing method comprising:
operating said switched reluctance electric machine in response to a desired command;
measuring an actual operating characteristic of said switched reluctance electric machine;
modeling said switched reluctance electric machine to formulate an estimated operating characteristic based on said desired command;
comparing said actual operating characteristic and said estimated operating characteristic to formulate an error there between; and
determining a parameter estimate for said switched reluctance machine based on said error and a previous parameter estimate.
10. A steering system with a switched reluctance electric motor and parameter estimation comprising:
a steerable wheel coupled to a switched reluctance motor;
a position sensor generating and transmitting a sensor signal indicative of a rotor position for said switched reluctance motor;
a controller operatively coupled to said motor and said position sensor;
said controller generating command to direct said motor and executing a method for parameter estimation comprising:
operating said switched reluctance electric machine in response to a desired command;
measuring an actual operating characteristic of said switched reluctance electric machine;
modeling said switched reluctance electric machine to formulate an estimated operating characteristic based on said desired command;
comparing said actual operating characteristic and said estimated operating characteristic to formulate an error there between;
determining a parameter estimate for said switched reluctance machine based on said error and a previous parameter estimate.
11. A system for estimating a parameter for a switched reluctance motor in a vehicle steering system comprising:
a means for operating said switched reluctance electric machine in response to a desired command;
a means for measuring an actual operating characteristic of said switched reluctance electric machine;
a means for modeling said switched reluctance electric machine to formulate an estimated operating characteristic based on said desired command;
a means for comparing said actual operating characteristic and said estimated operating characteristic to formulate an error there between;
a means for determining a parameter estimate for said switched reluctance machine based on said error and a previous parameter estimate.