Simulation of a field-oriented stator voltage of a stator of an asynchronous machine steadily required during operation
AssigneesRobert Bosch GmbH, Samsung SDI Co., Ltd.
InventorHolger Fink
Life of this patent
Estimating the term…
Abstract
A method for simulating a field-oriented stator voltage of a stator of an asynchronous machine required in the steady state during operation using a model, wherein the asynchronous machine is operated without a rotary encoder, in a field-oriented manner and with a graduated voltage, includes providing a field-oriented detected stator voltage. The method further includes providing a field-oriented detected stator current. The method further includes simulating the field-oriented stator voltage required in the steady state during operation on the basis of the field-oriented detected stator voltage and the field-oriented detected stator current.
Claims9
A method for operating an asynchronous machine, without a rotary encoder, the method comprising:
- determining, with a transformation device, (i) a detected field-oriented stator voltage based on a detected stator-oriented stator voltage received from a first sensor and (ii) a detected field-oriented stator current based on a detected stator-oriented stator current received from a second sensor;
- estimating, with a control unit configured to receive the detected field-oriented stator voltage and the detected field-oriented stator current, a required field-oriented stator voltage for steady state operation based on the detected field-oriented stator voltage, the detected field-oriented stator current, and a model, the estimating of the required field-oriented stator voltage at least comprising:
- integrating, with a first proportional integrator of the control unit, the detected field-oriented stator voltage over a first time with a normalization constant that is indicative of a stator inductance of the stator;
- and
- subtracting, with a first combination element of the control unit, the detected field-oriented stator current from the integrated field-oriented stator voltage in order to generate a field-oriented differential current;
- and
- controlling, with a current control unit configured to receive the estimated required field-oriented stator voltage and a setpoint for the field-oriented stator current, a field-oriented stator current of the asynchronous machine by applying graduated voltages to the asynchronous machine based on the estimated required field-oriented stator voltage and the setpoint for the field-oriented stator current.
An apparatus for operating an asynchronous machine without a rotary encoder, the apparatus comprising:
- a transformation device configured to determine (i) a detected field-oriented stator voltage based on a detected stator-oriented stator voltage received from a first sensor and (ii) a detected field-oriented stator current based on a detected stator-oriented stator current received from a second sensor;
- a control unit configured to receive the detected field-oriented stator voltage and the detected field-oriented stator current, the control unit configured to estimate a required field-oriented stator voltage for steady state operation based on the detected field-oriented stator voltage, the detected field-oriented stator current, and a model, the control unit at least comprising:
- a first proportional integrator configured to integrate the detected field-oriented stator voltage over a first time with a normalization constant that is indicative of a stator inductance of the stator;
- and
- a first combination element configured to subtract the detected field-oriented stator current from the integrated field-oriented stator voltage in order to generate a field-oriented differential current;
- and
- a current control unit configured to receive the estimated required field-oriented stator voltage and a setpoint for the field-oriented stator current and control a field-oriented stator current of the asynchronous machine by applying graduated voltages to the asynchronous machine based on the estimated required field-oriented stator voltage and the setpoint for the field-oriented stator current.
Dependencies are inferred from the claim text.