Field weakening vector controller for permanent magnet synchronous motor and control module
AssigneeHitachi, Ltd.
InventorsKazuaki Tobari, Daisuke Maeda, Tsunehiro Endo
Life of this patent
Estimating the term…
Abstract
A field weakening vector controller is disclosed which calculates a d-axis current command value for a power converter to drive a permanent magnet synchronous motor. The field weakening vector controller includes a stabilization calculator, a d-axis current command calculator, a q-axis current command calculator, and a phase calculator. The d-axis current command calculator corrects the d-axis current command value, while the stabilization calculator calculates a product of the phase error and the d-axis command value. The q-axis current command calculator corrects the q-axis current command value using this product.
Claims12
A field weakening vector controller which calculates a d-axis current command value so that the output voltage of a power converter which drives a permanent magnet synchronous motor may be a preset value, wherein:
- said filed weakening vector controller comprises a stabilization calculator, a d-axis current command calculator, a q-axis current command calculator, and a phase calculator;
- said d-axis current command calculator corrects the d-axis current command value using a difference between the d-axis current command value and the d-axis current detection value;
- said stabilization calculator calculates a product of a phase error or a sine signal of the phase error which is the difference between the reference axis of control calculated by said phase calculator and a reference axis of the motor, and the d-axis current command value or the d-axis current detection value;
- and
- said q-axis current command calculator corrects the q-axis current command value using the product.
A field weakening vector controller which calculates a d-axis current command value so that the voltage output from a power converter which drives a permanent magnet synchronous motor may be a preset value, wherein:
- said field weakening a vector controller comprises a stabilization calculator, a d-axis current command calculator, a q-axis current command calculator, a phase calculator, and a frequency calculator;
- said d-axis current command value using a difference between the d-axis current command value and the d-axis current detection value;
- said stabilization calculator calculates a product of a differential value of a speed error which is the difference between a speed command value calculated by said frequency calculator and a calculated speed value, and the d-axis current command value or the d-axis current detection value;
- and
- said q-axis current command calculator corrects the q-axis current command value using the product.
A control module for a field weakening vector controller comprising:
- a power converter which converts D.C. to A.C.;
- and
- a vector controller which calculates a d-axis current command value so that the output voltage of a power converter which drives a permanent magnet synchronous motor may be a preset value, wherein:
- said vector controller comprises a stabilization calculator, a d-axis current command calculator, a q-axis current command calculator, and a phase calculator;
- said d-axis current command calculator corrects the d-axis current command value using a difference between the d-axis current command value and the d-axis current detection value;
- said stabilization calculator calculates a product of a phase error or a sine signal of the phase error which is the difference between the reference axis of control calculated by said phase calculator and a reference axis of the motor, and the d-axis current command value or the d-axis current detection value;
- and
- said q-axis current command calculator corrects the q-axis current command value using the product.
Dependencies are inferred from the claim text.