Performance Motion Devices Juno MC71112, Руководство пользователя

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Operational Overview
Juno Step Motor Control IC User Guide
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7.3 Control Flow Overview
Figure 7-3:
Step Motor ICs
Control Flow
Overview
Figure 7-3 provides a control flow overview for the Juno step motor control ICs. It shows how a final motor command
is generated starting with the position command source and ending with the motor output module that generates
amplifier control output signals.
The following table provides a brief description of the major step motor control modules:
7.4 Control Applications
Typical Juno step motor control applications are shown in the following sections.
Module Name Function
Microstep Waveform
Generator This module inputs a command position and uses pre-programmed settings such as the
desired current and the number of microsteps per full step to synthesis the two-phase
step motor waveform. This module also provides stall detection via optional quadrature
encoder feedback signals.
Current Loop This module inputs the commanded current for each step motor phase along with the
measured current for each phase and uses a sophisticated proprietary current control
technique to generate motor voltage commands for each motor phase.
Motor Output This module inputs the motor phase commands and generates the appropriate PWM
(Pulse Width Modulation) electrical signals based on the selected output format.
AtRest
SPI Direct Input
Pulse & Direction
Current Loop Motor Output
Current Feedback
Quadrature Feedback (MC74113 Only)
Position
Command
Two-Phase
Step Motor
Output Signals
Profile Generator
Waveform
Generation