Position control device
AssigneeOkuma Corporation
InventorSatoshi Eguchi
Life of this patent
Estimating the term…
Abstract
A position control device includes a subtracter for subtracting a q-axis current detection value iq from a q-axis current command value iq* to output a q-axis current error Δiq, an adder for adding a q-axis current compensation amount iqc* for compensating for response timing of q-axis current to the q-axis current error Δiq, a q-axis current controller for amplifying an output of the adder by I-P control to calculate a q-axis voltage error Δvq and calculating a q-axis voltage command value vq* on the basis of the q-axis voltage error Δvq, and a second adder for adding a q-axis voltage feedforward amount vqf corresponding to a time derivative value s·iq of the q-axis current to the q-axis voltage command value vq* to calculate a final q-axis voltage command value.
Claims2
A position control device using a PWM inverter as a power converter and for arithmetically controlling current for an electric motor by a two-phase (d- and q-axis) rotational coordinate system, comprising:
- a subtracter for subtracting a q-axis current detection value from a q-axis current command value to output a q-axis current error;
- an adder for adding a q-axis current compensation amount for compensating for response timing of q-axis current to the q-axis current error;
- a q-axis current controller for amplifying an output of the adder by I-P control to calculate a q-axis voltage error and calculating a q-axis voltage command value on the basis of the q-axis voltage error;
- and
- a second adder for adding a q-axis voltage feedforward amount corresponding to a time derivative value of the q-axis current to the q-axis voltage command value to calculate a final q-axis voltage command value.
Dependencies are inferred from the claim text.