Motor parameter estimation method and apparatus

Abstract

A system and method for establishing estimated values of electrical parameters of a motor. The electrical parameters may be established from motor databases, measured input electrical data, measured output data, and various estimations to account for unknown motor parameters. Compensations also may be provided for stator resistance, cable resistance, and other motor parameters. Based on the foregoing data, the system and method also may be used to estimate motor operating parameters, such as torque, efficiency, output power, output speed, and other performance criteria of the motor. The system and method also may establish energy and monetary comparison data between the motor and at least one alternative motor.

1 . A system comprising: 
 means for obtaining electrical parameters of an electric motor based on electrical input data of the electric motor; and    means for establishing energy and monetary comparison criteria between the electric motor and an alternative motor.    
   
   
       2 . The system as recited in  claim 1 , comprising means for estimating at least one operating parameter of the electrical motor based at least partially on the means for obtaining electrical parameters.  
   
   
       3 . The system as recited in  claim 2 , wherein the at least one operating parameter comprises motor torque.  
   
   
       4 . The system as recited in  claim 2 , wherein the at least one operating parameter comprises motor efficiency.  
   
   
       5 . The system as recited in  claim 2 , wherein the at least one operating parameter comprises output power.  
   
   
       6 . The system as recited in  claim 2 , wherein the at least one operating parameter comprises rotor temperature.  
   
   
       7 . The system as recited in  claim 1 , wherein the means for obtaining comprises means for obtaining electrical parameters of the electric motor based on electrical input data of the electric motor and cable resistance data.  
   
   
       8 . The system as recited in  claim 7 , comprising means for establishing cable resistance data based on a cable gauge, a number of cables per phase, a cable length, and a cable temperature.  
   
   
       9 . The system as recited in  claim 1 , wherein the energy and monetary comparison criteria comprises energy usage data of the electric motor and the alternative motor.  
   
   
       10 . The system as recited in  claim 1 , wherein the energy and monetary comparison criteria comprises operation cost data of the electric motor and the alternative motor.  
   
   
       11 . One or more machine-readable media having application instructions encoded thereon, the application instructions comprising: 
 instructions adapted to establish estimated values of a plurality of electrical parameters of an electric motor based at least partially on measured motor parameters; and    instructions adapted to establish monetary comparison data of the electric motor versus an alternative motor.    
   
   
       12 . The one or more machine-readable media as recited in  claim 1   1 , wherein the application instructions comprise instructions adapted to estimate an operating parameter of the electric motor based at least partially on the estimated values.  
   
   
       13 . The one or more machine-readable media as recited in  claim 11 , wherein the application instructions comprise instructions adapted to establish operational cost data of the electric motor.  
   
   
       14 . The one or more machine-readable media as recited in  claim 11 , wherein the application instructions comprise instructions adapted to establish energy comparison data of the electric motor versus the alternative motor.  
   
   
       15 . The one or more machine-readable media as recited in  claim 1   1 , wherein the application instructions comprise instructions adapted to output and/or store the monetary comparison data.  
   
   
       16 . The one or more machine-readable media as recited in  claim 11 , wherein the application instructions comprise instructions adapted to establish operational savings data of the alternative motor versus the electric motor.  
   
   
       17 . A method of analyzing a motor having a rotor and a stator, comprising: 
 providing an instrumentation system with motor input data;    operating the instrumentation system to establish estimated values of a plurality of electrical parameters of the motor based on the motor input data; and    engaging the instrumentation system to establish performance comparison data between the motor and at least one alternative motor.    
   
   
       18 . The method as recited in  claim 17 , further comprising operating the instrumentation system to estimate at least one motor operating parameter based on the estimated values and the motor input data.  
   
   
       19 . The method as recited in  claim 17 , wherein engaging comprises obtaining monetary comparison data of operating costs of the motor and the at least one alternative motor.  
   
   
       20 . The method as recited in  claim 17 , wherein engaging comprises obtaining energy usage comparison data between the motor and the at least one alternative motor.