| US 7,511,448 B2 | ||
| Motor control device | ||
| Kei Terada, Tokyo (Japan); Tetsuaki Nagano, Tokyo (Japan); Yasunobu Harada, Tokyo (Japan); and Kazutaka Takahashi, Tokyo (Japan) | ||
| Assigned to Mitsubishi Electric Corporation, Tokyo (Japan) | ||
| Appl. No. 10/585,416 PCT Filed Jan. 07, 2004, PCT No. PCT/JP2004/000028 § 371(c)(1), (2), (4) Date Sep. 04, 2008, PCT Pub. No. WO2005/067137, PCT Pub. Date Jul. 21, 2005. |
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| Prior Publication US 2008/0309265 A1, Dec. 18, 2008 | ||
| Int. Cl. H02P 27/04 (2006.01) | ||
| U.S. Cl. 318—807 [318/700; 318/400.01; 318/400.07; 318/721; 318/724; 700/12; 700/13; 700/32; 700/33; 700/34] | 17 Claims |
| 1. A motor control device comprising:
a velocity calculation unit that calculates an actual velocity from a detected position that is a position of a motor or of
a load connected to the motor, the detected position being detected by a detector;
a velocity control unit that performs velocity control to cause the actual velocity to follow a velocity command and outputs
a q-axis current command;
a uvw/dq coordinate converting unit that receives a three-phase current detected in an inverter, performs coordinate conversion
from a uvw three-phase coordinate system at rest into a dq synchronous rotation coordinate system, and outputs a d-axis current
detection value and a q-axis current detection value;
a current control unit that receives a d-axis current command, the q-axis current command, the d-axis current detection value,
and the q-axis current detection value, performs current control so that a dq-axis current detection value coincides with
a dq-axis current command, and outputs a d-axis voltage command and a q-axis voltage command;
a dq/uvw coordinate converting unit that receives the d-axis voltage command, the q-axis voltage command, and the detected
position, performs coordinate conversion from the dq synchronous rotation coordinate system into the uvw three-phase coordinate
system at rest, and outputs a three-phase voltage command;
an inverter that receives the three-phase voltage command, applies an actual three-phase voltage to the motor, and drives
the motor at a variable velocity;
a superimposed signal generating unit that outputs a superimposed signal of a repetitive waveform, such as a triangular wave
or a sine wave;
a d-axis current command generating unit that adds the superimposed signal generated by the superimposed signal generating
unit to a d-axis current command nominal value and outputs the d-axis current command; and
an axial misalignment detecting unit that receives the d-axis current command and the q-axis current command output from the
velocity control unit and outputs an axial misalignment angle estimation value.
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