Patent Document ID: 4743818
Application ID: 07032909
Patent Flag: 1

Claim One:
1. Apparatus which performs an operation as a function of the temperature T.sub.Rn of a rotating rotor at a given instant of time comprising: temperature sensing means for determining the temperature T.sub.S of a stator which is mechanically associated with said rotating rotor; current sensing means for digitally sampling the electrical current I flowing in the windings of said stator at a sampling rate .beta., where current I is electromagnetically associated with said rotating rotor; digital calculating means interconnected with said temperature sensing means and said current sensing means for determining said rotor temperature T.sub.Rn according to the following relationship: ##EQU10## where: .delta.=.beta..DELTA.t .DELTA.t=the time between the preceding time said stator temperature was determined and said given instant of time, T.sub.R(n-1) =the rotor temperature of said preceding time, K.sub.1, K.sub.2 and K.sub.3 are constants; and means interconnected with said digital calculating means for performing said operation as a function of T.sub.Rn.