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參數(shù)資料
| 型號(hào)： | IM2000S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | HIGH PERFORMANCE MICROSTEPPING STEP MOTOR CONTROLLER |
| 中文描述： | 高性能的微步進(jìn)電機(jī)控制器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 142K |
| 代理商： | IM2000S |
13
C hopping Os c illa t or
The IM2000S contains a built-in oscillator which is
used to clock the internal pulse width modulator.
The oscillator frequency is set by an external RC
circuit.
While it is recommended to set the oscillator
frequency to approximately 20kHz to reduce
motor heating and maintain a frequency above the
audible range, the internal oscillator can accommo-
date a wide range of frequencies. Figure 3.9 shows
the relationship between the chopping frequency
and the RC resistor component values. Note that
the values shown were recorded using a fixed 1nF
capacitor.
R e s e t
The reset input is a Schmitt triggered input used to initialize the IM2000S. The IM2000S must be reset on power-up to
ensure proper operation. In order to initialize the IM2000S, the reset input must be held in a logic LOW state for a
minimum of 200ns.
Upon reset the IM2000S is configured such that Phase A is at 0 and Phase B is full on and in the positive half cycle. The
fault output is cleared as long as no fault condition is active on any of the protection inputs. The current reduction
output will set appoximately 1.5 seconds following the release of the reset input if no step clock input is detected.
The microstep resolution select lines and the direction input are latched on the rising edge of the reset input. This will
occur in either the buss or stand-alone mode of operation.
E xt e r na l L ook up Ta ble
The IM2000S allows the use of an external lookup
table to generate the Phase A and Phase B wave-
forms. This is accomplished by the use of the RSEL
input. By using an external lookup table the user can
tailor the wave shapes to meet individual needs.
When the RSEL input is in a logic LOW state, the
internal lookup tables are selected and the sine and
cosine information is accessed internal to the
IM2000S. When RSEL is HIGH an eight bit address
is output to AD0 - AD7. This eight bit address will
then increment or decrement depending on the state
of the microstep resolution and direction inputs.
The IM2000S uses a unique approach in the genera-
tion of the address. Eight bits are used to get the full
256 positions. Only a quarter of the sine and cosine
waveforms need to be stored. The IM2000S will
automatically reconstruct the entire waveform from
this information. This means only 502 words need to
be stored to generate the entire sine and cosine
waveform for decimal resolutions. The IM2000S will
automatically generate the sign and cosine signs and
the full step output signal internally.
45
40
35
30
25
20
15
10
5
10
20
30
40
50
60
Oscillator Frequency (kHz)
Figure 3.9: Oscillator Frequency Settings
Table 3.4: External Lookup Table
Example Address Locations
p
u
k
o
e
m
o
L
a
l
n
E
r
e
a
e
a
t
E
T
x
#
p
e
t
S
7
e
D
D
H
A
0
(
m
i
e
D
D
A
)
D
0
)
0
0
1
)
2
3
0
5
2
)
4
6
0
0
1
3
)
6
9
0
5
1
4
)
8
C
(
0
0
2
5
)
A
F
0
5
2
6
)
8
C
(
0
0
2
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