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參數(shù)資料
| 型號： | DK1241A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Advanced Microstepping Motion Control Chipset |
| 中文描述： | 高級微步運動控制芯片組 |
| 文件頁數(shù)： | 33/60頁 |
| 文件大?。?/td> | 422K |
| 代理商： | DK1241A |
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33
1
0
0/256
(min. value)
255/256
(max. value)
128/256
(50 % value)
1
0
1
0
An output pulse width of 0 parts per 256 represents the mnimum
voltage, an output pulse width of 128 per 256 (50 %) represents a
voltage of 50 % total scale and a pulse width of 256 per 256 represents
the maximumpositive voltage.
Motor Drive Configurations
Below is shown a typical amplifier configuration for a 2-phase stepper
motor using either the PWMor DAC output mode.
2-Phase Motor Output Connection Scheme
Axis #1 phase A
Axis #1 Phase B
MC1241A
Mtr #1
Mtr #2
Axis #2 phase A
Axis #2 Phase B
Amplifiers
Using the DAC output mode the digital motor output word for each
phase is typically converted into a DC signal with a value between -10
to +10 volts. This signal can then be input into an off-the-shelf DC-
Servo type amplifier (one amplifier for each phase) or into any other
linear or switching amplifier that performs current control and provides a
bipolar, two-lead output.
In this scheme each amplifier drives one phase of the stepper motor,
with the chipset generating the required sinusoidal waveforms in each
phase to performsmooth, accurate motion.
If the chipset's PWMoutput mode is used the PWMmagnitude and sign
signals are typically connected to an H-bridge-type device. For
maximumperformance current control should be performed by the
amplifier to mnimze the coil current distortion due to inductance and
back-EMF.
Although there are several methods that can be used to achieve current
control with the PWMoutput mode, a common method is to pass the
PWMmagnitude signal through a low pass filter, thereby creating an
analog reference signal which can be directly compared with the current
through the coil.
Several single-chip amplifiers are available which are compatible with
these input signals. These amplifiers require an analog reference input
(low-passed PMWMag signal fromchipset) as well as a sign bit
(PWMSign signal fromchipset). The amplifier in-turn performs current
control typically using a fixed-off time PWMdrive scheme (See
application notes section of this document for an example of such a
circuit)
The diagrambelow shows this amplifier scheme:
MC1241A
PWM Mag. A
PWM Sign A
PWM Mag. B
PWM Sign B
Amplifier
Motor
Current
Control
H-Bridge
Low Pass
Filter
Low Pass
Filter
Current
Control
H-Bridge
Relative to the DAC output method the PWMoutput mode when used
with this amplifier scheme has the advantage of high performance with
a mnimumof external parts. This amplifier scheme is shown below for
a single motor axis (two phases).
3-Phase Drive Configuration
Below is shown a typical amplifier configuration using the MC1241A in
DAC mode for a 3-phase stepper or for an AC Induction motor with 3
phases.
3-Phase Motor Output Connection Scheme
Axis #1 phase A
Axis #1 Phase B
Axis #1 Phase C
MC1241
Mtr #1
Mtr #2
Axis #1
C=-(A+B)
Axis #2
C=-(A+B)
Axis #2 phase A
Axis #2 Phase B
Axis #2 Phase C
Amplifiers
DAC 1A
DAC 1B
DAC 2A
DAC 2B
When using DAC output mode the digital word provided by the chipset
must first be converted into a voltage using an external DAC. Two DAC
channels are required per axis.The third phase is constructed externally
using the expression C = -(A+B). This is usually accomplished with an
Op-amp circuit.
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