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Test Report

 

TIDA-00830 

– November 2015 

 

 

 

TIDA-00830 

24V Stepper Motor Design with AutoTune™ TI Reference Design 

 
 

 

Design Overview 

TIDA-00

830 is an application overview of TI’s 

automatic stepper motor tuning feature known as 
AutoTune™.  This design showcases how quickly 
AutoTune™ can adapt to changes in system inputs or 
motor characteristics without the user having to apply 
any type of parameter tuning.  The hardware for this 
design is sourced from the DRV8880 Evaluation 
Module so the user has the ability to work with the 
entire feature set of this device.  
 

Design Resources

 

TIDA-00830 

 

Design Folder 

DRV8880

 

 

Product Folder 

MSP430F2617

 

 

Product Folder 

FT232RL

 

 

Product Folder 

 

STEP/DIR

Step size

Decay mode

UART

USB

Stepper 

Motor

DRV8880

MSP430

FT232RL

3.3-V LDO

V

M

Design Features 

 

6.5- to 45-V operation with up to 2.0-A full-
scale (max drive current) 

 

Configurable PWM Off-Time of 10-, 20-, or 
30-µs  

 

3.3-V, 10-mA LDO Regulator supply 

 

AutoTune stepper 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 is tuning.  Tuning involves selecting the best decay 
mode to operate the stepper motor efficiently.  A well-behaved current waveform makes for a well-
behaved stepper.  These steppers will run smoothly (less vibration), quietly (less noise) and efficiently 
(less power dissipation).  Unfortunately, there are a lot of factors that can affect the waveform, such as 
supply voltage, motor parameters, motor speed and load.  Finding a fixed decay mode to match these 
settings can sometimes be difficult, especially if these parameters shift during operation.  Texas 
Instruments AutoTune offered in the DRV8880 makes this process much simpler by determining the 
proper decay mode and fast decay percentage based on individual motor characteristics and system 
inputs.   

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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