Rotor current prediction in an electric motor drive having an only-stationary-side compensation network

Abstract

Embodiments of the disclosure provide an electric drive motor system that includes a stationary-side, a rotating-side, and a stationary-side sensor system operable to detect current on the stationary-side and send current-based sensor readings to a controller. The stationary-side further includes a compensation network. The controller is operable to perform a rotor current prediction operation operable to predict a rotor current associated with a rotor of the rotating-side based at least in part on the current-based sensor readings and a parameter of at least one component of the compensation network of the stationary-side.

What is claimed is: 
     
         1 . An electric drive motor system comprising:
 a stationary-side;   a rotating-side; and   a stationary-side sensor system operable to detect current on the stationary-side and send current-based sensor readings to a controller;   wherein the stationary-side comprises a compensation network; and   wherein the controller is operable to perform a rotor current prediction operation comprising predicting a rotor current associated with a rotor of the rotating-side based at least in part on the current-based sensor readings and a parameter of at least one component of the compensation network of the stationary-side.   
     
     
         2 . The electric drive motor system of  claim 1 , wherein the stationary-side further comprise an inverter operable to convert direct current (DC) received from an energy source to alternating current (AC). 
     
     
         3 . The electric drive motor system of  claim 2 , wherein the current detected by the stationary-side sensor system comprises the AC. 
     
     
         4 . The electric drive motor system of  claim 1  wherein the at least one component of the compensation network of the stationary-side comprises a capacitive element. 
     
     
         5 . The electric drive motor system of  claim 1 , wherein the at least one component of the compensation network of the stationary-side comprises an inductive element. 
     
     
         6 . The electric drive motor system of  claim 5 , wherein the at least one component of the compensation network of the stationary-side further comprises a capacitive element. 
     
     
         7 . The electric drive motor system of  claim 1 , wherein:
 the compensation network of the stationary-side comprises an only-stationary-side (OSS) compensation network; and   the at least one component of the compensation network of the stationary-side comprises a first OSS compensation element of the OSS compensation network.   
     
     
         8 . The electric drive motor system of  claim 7 , wherein the first OSS compensation element is operable to provide a rotating-side compensation function. 
     
     
         9 . The electric drive motor system of  claim 8 , wherein a value of the first OSS compensation element is selected to provide the rotating-side compensation function. 
     
     
         10 . The electric drive motor system of  claim 1 , wherein:
 the stationary-side comprises a stator having stationary-side windings;   the rotating-side comprises the rotor having rotating-side windings; and   the stationary-side windings are operable to wirelessly transfer alternating current (AC) excitation signals to the rotating-side windings.   
     
     
         11 . A method of fabricating an electric drive motor system comprising:
 forming a stationary-side;   forming a rotating-side; and   forming a stationary-side sensor system operable to detect current on the stationary-side and send current-based sensor readings to a controller;   wherein the stationary-side comprises a compensation network; and   wherein the controller is operable to perform a rotor current prediction operation comprising predicting a rotor current associated with a rotor of the rotating-side based at least in part on the current-based sensor readings and a parameter of at least one component of the compensation network of the stationary-side.   
     
     
         12 . The method of  claim 11 , wherein the stationary-side further comprise an inverter operable to convert direct current (DC) received from an energy source to alternating current (AC). 
     
     
         13 . The method of  claim 12 , wherein the current detected by the stationary-side sensor system comprises the AC. 
     
     
         14 . The method of  claim 11  wherein the at least one component of the compensation network of the stationary-side comprises a capacitive element. 
     
     
         15 . The method of  claim 11 , wherein the at least one component of the compensation network of the stationary-side comprises an inductive element. 
     
     
         16 . The method of  claim 15 , wherein the at least one component of the compensation network of the stationary-side further comprises a capacitive element. 
     
     
         17 . The method of  claim 11 , wherein:
 the compensation network of the stationary-side comprises an only-stationary-side (OSS) compensation network; and   the at least one component of the compensation network of the stationary-side comprises a first OSS compensation element of the OSS compensation network.   
     
     
         18 . The method of  claim 17 , wherein the first OSS compensation element is operable to provide a rotating-side compensation function. 
     
     
         19 . The method of  claim 18 , wherein a value of the first OSS compensation element is selected to provide the rotating-side compensation function. 
     
     
         20 . The method of  claim 11 , wherein:
 the stationary-side comprises a stator having stationary-side windings;   the rotating-side comprises the rotor having rotating-side windings; and   the stationary-side windings are operable to wirelessly transfer alternating current (AC) excitation signals to the rotating-side windings.