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A Performance Improvement of V/f Control using a Disturbance Observer
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| Author(s) |
Junichi Itoh, Tetsuma Hoshino, Takayuki Kaneko |
| Abstract |
This paper proposes a dead-time compensation
method with a disturbance observer and a current controller
for V/f control. Dead-time compensation is very important to
improve motor drive performances in the low speed region.
The proposed compensation method is composed in the d-q
rotational frame. The ripple of the d-axis current caused by
the dead-time is suppressed by an auto current regulator, the
ripple of the q-axis current according to the dead-time is
suppressed by the disturbance observer. The control of the
d-axis current is added the auto current regulator to the V/f
control. As a result, the magnitude of the motor current can
keep more than the rated exciting current in spite of the low
speed region with the V/f control. The control of the q-axis
current only uses the disturbance observer to suppress the
voltage error of the dead-time. In this paper, the
performance of the proposed controller in the low speed
region is discussed based on the experimental results. The
proposed method can improve the current distortion to less
than quarter against the conventional method. Although the
disturbance observer requires motor parameters, it is not so
sensitive. |
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| Filename: | T5-129.pdf |
| Filesize: | 593.2 KB |
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| Type |
Members Only |
| Date |
Last modified 2007-03-12 by System |
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