Patent ID: 11929693
Assignee: MAVEL EDT S.P.A.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A system for controlling an electric machine comprising:
a position sensor configured to detect an angular position of a rotor of the electric machine;
at least two alternate current sensors, each configured to detect an alternate current value next to an input phase to the electric machine, and electrically connected to a phase of a supplying circuit of the electric machine, in turn electrically connected to an inverter;
a direct voltage sensor and a direct current sensor configured to respectively detect a voltage and a direct current supplied by electric supply means as input to the inverter; and
an electronic control unit comprising a microprocessor and memory means and configured to process, through suitable information programs, data detected by the sensors and drive the electric machine to perform a control method, the control method comprising:
a first step of detecting an angular position of a rotor of the electric machine;
a second step, simultaneous with the first step, of detecting values of alternate current next to at least two phases of an input current to the electric machine electrically connected to an inverter;
a third step, simultaneous with the first step and the second step, of detecting values of voltage and direct current supplied as input to the inverter by electric supply means;
a fourth step of estimating an estimated torque supplied by the electric machine performed by processing data detected by position sensors, and the values of alternate current in the first step and in the second step, and data obtained by means of simulations of the electric machine;
a fifth step of computing a check torque supplied by the electric machine performed by using the following formula:, T
   
    c
    ⁢
    h
    ⁢
    e
    ⁢
    c
    ⁢
    k
   
  
  =
  
   
    
     P
     
      D
      ⁢
      C
     
    
    ·
    n
   
   ω
  
 

wherein ω is the speed of the rotor of the electric machine computed in a first sub-step starting from the angular position of the rotor of the electric machine detected by the position sensor, PDC is the value of the power supplied to the electric machine by the electric supply means, and n is the efficiency of the electric machine; and

a sixth step of comparing the value of the check torque computed in the fifth step and the value of the estimated torque estimated in the fourth step.