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MITSUBISHI CNC
III Functional Specifications
13.2 Dynamic Accuracy Compensation
13.2.1 Smooth High-gain (SHG) Control
M720VW
M system
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L system
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This is a high-response and stable position control method using the servo system. This SHG control
achieves an approximately three-fold position loop gain equally compared to the conventional control
method.
The features of the SHG control are as follows.
(1) The acceleration/deceleration becomes smoother, and the mechanical vibration can be suppressed
(approx. 1/2) during acceleration/deceleration. (In other words, the acceleration/deceleration time
constant can be shortened.)
(a)
(c)
(d)
(e)
(a) Conventional control (position loop gain = 33rad/S)
(b) SHG control (position loop gain = 50rad/S)
(c) Speed
(d) Current
(e) Machine vibration
(f) Step response
(g) Time
(h) Conventional control
(i) SHG control
(j) Machine vibration amount (μm)
III - 298
M730VW
M750VW
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(b)
(f)
(g)
M720VS
M730VS
M750VS
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(h)
(i)
(g)
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6.0
3.0
(j)
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