ACCELERATION AND DECELERATION CONTROL APPARATUS AND METHOD THEREOF

• US 20090315502A1
• Filed: 12/07/2008
• Published: 12/24/2009
• Est. Priority Date: 06/20/2008
• Status: Abandoned Application

• Current Assignee: Foxnum Technology Co., Ltd.
• Original Assignee: Foxnum Technology Co., Ltd.
• Inventors: KING, YUEH-HSUN, CHIU, JHY-HAU
• Application Number:
  US12/329,612
• Publication Number:
  US 20090315502A1
• Time in Patent Office: Days
• US Class Current: 318/573
• CPC Class Codes: G05B 19/4163 Adaptive control of feed or cutting velocity without NC B23Q15/12
• CPC Class Codes: G05B 2219/43036 Velocity profile with given starting and stopping speed vector
• CPC Class Codes: G05B 2219/43049 Digital convolution for velocity profile, also successive convolution

Abstract

An acceleration/deceleration control apparatus for a computer numerical control machine tool includes an interpolator, a motion-transforming unit, and a drive transforming unit. The interpolator receives a velocity signal and outputs a pulse velocity signal. The motion unit is connected to the interpolator and includes an operation filter. The operation filter includes a plurality of different weight values and a plurality of registers corresponding to the numbers of the weights to calculate the pulse velocity signal to an acceleration/deceleration pulse velocity signal by a first function. The weight values are derived by a second function corresponding to the shape of the acceleration/deceleration pulse velocity signal. The driving unit is connected to the motion unit and transforms the acceleration/deceleration pulse velocity signal to a driving signal to drive a motor.

Claims

1. An acceleration/deceleration control apparatus for servo control of a computer numerical control (CNC) machine, the apparatus comprising:

an interpolator configured for receiving a velocity signal and outputting a velocity pulse signal;

a motion-transforming unit connected to the interpolator and configured for receiving the velocity pulse signal, the motion-transforming unit comprising an operation filter, the operation filter comprising a plurality of registers and using a plurality of weight values corresponding to the registers, and configured for obtaining an acceleration/deceleration pulse signal according to a first function;

a drive transforming unit connected to the motion-transforming unit and configured for transforming the acceleration/deceleration pulse signal to a driving signal.

2. The acceleration/deceleration control apparatus as claimed in claim 1, wherein the first function is

$V^{\prime }$



x 

[ ω

] = ∑

i = o n - 1 

{ f 

( i ) Ks ×

Vx 

[ ω

- i ] }

wherein V′

x[ω

] is an acceleration/deceleration pulse signal, Vx[ω

−

i] is a velocity pulse signal corresponding to the weights, ƒ

(i) is the value of the weight, Ks is the sum of ƒ

(i), and n is the number of registers.

3. The acceleration/deceleration control apparatus as claimed in claim 1, wherein the weight values are provided by a second, Gaussian function:

$f<br><br>\left(n\right)=\frac{1}{\mathrm{\sigma <br><br>}<br><br>\sqrt{2<br><br>\mathrm{\pi <br><br>}}}<br><br>{\mathrm{<br><br>}}^{-\frac{{\left(n-\mathrm{\mu <br><br>}\right)}^2}{2<br><br>{\mathrm{\sigma <br><br>}}^2}}$

wherein σ

is standard deviation, μ

is expectation value, and n is the number of sampling periods T.

4. The acceleration/deceleration control apparatus as claimed in claim 1, wherein the weight values are given by an extreme value distribution function corresponding to the shape of the acceleration/deceleration pulse signal,

5. The acceleration/deceleration control apparatus as claimed in claim 1, wherein the driving signal is a pulse or voltage.

6. An acceleration/deceleration control method for servo control of a CNC machine, the method comprising:

providing an interpolator for receiving a velocity signal and outputting a velocity pulse signal;

receiving the velocity pulse signal, and calculating an acceleration/deceleration pulse signal by a first function, based on receiving the velocity pulse signal, using a motion-transforming unit connected to the interpolator, the motion-transforming unit comprising an operation filter comprising a plurality of registers and using a plurality of weight values corresponding to the registers,

receiving the acceleration/deceleration pulse signal and obtaining a driving signal transformed by a drive transforming unit, based on the acceleration/deceleration pulse signal, to drive a motor, the drive transforming unit connected to the motion-transforming unit.

7. The acceleration/deceleration control method as claimed in claim 6, wherein the first function formula is

$V^{\prime }$



x 

[ ω

] = ∑

i = o n - 1 

{ f 

( i ) Ks ×

Vx 

[ ω

- i ] }

wherein V′

x[ω

] is an acceleration/deceleration pulse signal, Vx[ω

−

i] is a pulse velocity signal corresponding to the weight values, ƒ

(i) is the value of the weight, Ks is the sum of ƒ

(i), and n is the number of registers.

8. The acceleration/deceleration control method as claimed in claim 6, wherein the weight values are given by a second function, a Gaussian function of:

$f<br><br>\left(n\right)=\frac{1}{\mathrm{\sigma <br><br>}<br><br>\sqrt{2<br><br>\mathrm{\pi <br><br>}}}<br><br>{\mathrm{<br><br>}}^{-\frac{{\left(n-\mathrm{\mu <br><br>}\right)}^2}{2<br><br>{\mathrm{\sigma <br><br>}}^2}}$

wherein σ

is a standard deviation, μ

is an expectation value, and n is the number of sampling periods T.

9. The acceleration/deceleration control method as claimed in claim 6, wherein the weight values are given by a second function which is an extreme value distribution function corresponding to the acceleration/deceleration pulse signal.

10. The acceleration/deceleration control method as claimed in claim 6, wherein the drive transforming unit transforms the driving signal to a pulse or a voltage.