HS50_advance_level 2 - 第143页
Stud ent Gu ide HS-5 0 Adva nced II 07/2 002 Ed ition 6 Control & Co mmunicatio n 13 7KHI XQFWLRQRIW KHWUDFNVFDOH HQFRGHUDQGDQDO RJXHVLJQDOV$DQG% $ QDORJXHRXW SXWRIHQF RGHU$DQG% As descri…
07/2002 Edition Student Guide HS-50 Advanced II
6 Control & Communication
12
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A axis controller, a servo amplifier and a axis drive generate all movements in the machine.
The X-, Y-, and the star axis in the HS-50 machine are based on the 3 phase AC principle.
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Digital axis
controller with
additional VC-
controller
Analog servo
amplifier
Axis drive
digital position
detection with
feed back loop
Tracksignals
M
3~
Tracksignals
Incremental
encoder
Encoder
analogue
output
signal
Amplifier with Offset.
Signal multiplication
and digitizing
Track signals A and B and
their inverted signals
Axes controller
Linear or
Rotor scale
Student Guide HS-50 Advanced II 07/2002 Edition
6 Control & Communication
13
7KHIXQFWLRQRIWKHWUDFNVFDOHHQFRGHUDQGDQDORJXHVLJQDOV$DQG%
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As described on the previous page the encoder produces 2 track signals (A and B) that
are phase shifted by 90 degrees. Here we see Track A leading Track B indicating the
axis is moving to the right.
Track scale
Encoder with scale for track A and B
Track A and B measure the same
scale but the encoder scale is shifted
by the half of bright or dark distance.
This makes a 90 degree signal shift.
If the encoder moves to the right track
signal A is the leading signal before
track signal B. If the encoder moves to
the left the reverse happens.
07/2002 Edition Student Guide HS-50 Advanced II
6 Control & Communication
14
'LJLWL]DWLRQRI7UDFN6LJQDOV
Digitization and multiplication of the analogue track signals.
The electronic multiplication of the track signals is based on the voltage level and on the phase
shift of the two track signals (the drawing is simplified). There is a Schmitt Trigger circuit with
phase check and this digitizes and multiplies the analogue track signals. These pulses have a fre-
quency of 25 times that of the analogue waveform with each pulse formed as the analogue wave-
form passes certain predetermined voltage levels.
5,12 ms
0,512 ms