Determining a permanent magnet flux state
AssigneeSchneider Toshiba Inverter Europe SAS
InventorsRashad Ghassani, Mohamad Koteich
Life of this patent
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Abstract
Examples include a method for determining a permanent magnet flux state of a rotor in a synchronous motor using a VSD. The method includes obtaining d-axis and q-axis inductance values of the motor, fixing a non-zero stator current magnitude and controlling a motor speed using a speed loop regulation in a stator current angle γ polar coordinate frame to reach a zero motor speed steady state corresponding to the fixed non-zero stator current magnitude, to the obtained d-axis and q-axis inductance values, and to a no-load situation. The method further includes recording coordinates of the reached steady state.
Claims20
A method for determining a permanent magnet flux state of a rotor in a synchronous motor using a variable speed drive, VSD, the method comprising:
- obtaining, at the VSD, d-axis and q-axis inductance values of the motor;
- fixing, by the VSD, a non-zero stator current magnitude;
- controlling, by the VSD, a motor speed of the motor using a speed loop regulation in a stator current angle γ, polar coordinate frame to reach a zero motor speed steady state corresponding to the fixed non-zero stator current magnitude, to the obtained d-axis and q-axis inductance values, and to a no-load situation, wherein controlling the motor speed comprises maintaining the fixed non-zero stator current magnitude constant while adjusting the stator current angle until the zero motor speed steady state is reached;
- and
- recording, at the VSD, coordinates of the reached steady state, wherein the coordinates comprise a value of the stator current angle corresponding to the zero motor speed steady state.
A system for determining a permanent magnet flux state of a rotor in a synchronous motor, the system comprising:
- a variable speed drive (VSD) configured to:
- obtain d-axis and q-axis inductance values of the motor;
- fix a non-zero stator current magnitude;
- control a motor speed of the motor using a speed loop regulation in a stator current angle γ, polar coordinate frame to reach a zero motor speed steady state corresponding to the fixed non-zero stator current magnitude, to the obtained d-axis and q-axis inductance values, and to a no-load situation, wherein controlling the motor speed comprises maintaining the fixed non-zero stator current magnitude constant while adjusting the stator current angle until the zero motor speed steady state is reached;
- and
- record coordinates of the reached steady state, wherein the coordinates comprise a value of the stator current angle corresponding to the zero motor speed steady state.
Dependencies are inferred from the claim text.