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Содержание TIDA-00830

Страница 1: ...motor tuning Simple GUI for driver input control and motor tuning Onboard USB communication for easy connectivity with external controller 100 mil header gives test probe access to all driver input controls Featured Applications Automatic Teller and Money Handling Machines 3D Printers Factory Automation and Robotics Video Security Cameras 1 Introduction For stepper motors a common design problem i...

Страница 2: ...rs a different decay mode depending on the state of the decay mode setting pins and ATE pin Depending on if the sine DAC table is increasing or decreasing steps will also affect the decay mode the device uses All of these features included in the DRV8880s current regulation system allow the driver to have constant control over how much current is being supplied to the stepper motor 3 Current Rippl...

Страница 3: ...the current decay Each drive cycle has a mandatory tBLANK interval to drive the motor Once the tBLANK interval has elapsed the device can continue with the remainder of the tDRIVE interval if it has not hit the current limit ITRIP or stop driving and begin decaying current if the current limit has been reached based on whichever decay setting AutoTune chooses tBLANK tDRIVE tSLOW tOFF tFAST ITRIP I...

Страница 4: ...d from 100 to 25 torque using AutoTune and Slow Fast decay modes In Figure 6 AutoTune is being used to quickly adapt to the change in required torque and keep the regulation pattern constant Minimal current ripple is observed during the lower current steps Figure 7 uses a fixed decay setting where the current decreases more slowly through the winding until it falls below the current limit Figure 6...

Страница 5: ...r to start drawing less current from the power supply If the motor were tuned at room temperature and without any load that same tuning may no longer be ideal once temperature increases AutoTune can actively adapt to changes in motor resistance caused by the increase in temperature Using a QSH 4218 41 10 035 stepper motor running at 1000 PPS under loaded conditions for 350 seconds at 1 8 micro ste...

Страница 6: ...o change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of these resources is prohibited No license is granted to any other TI intellectual property right or to any third party intellectual property right TI disclaims responsibility for and you will fully indemn...

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