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NI 9503 User Manual and Specifications
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© National Instruments
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for any motor. Motors supported by National Instruments have
already been tuned for optimal torque smoothing.
The NI 9503 uses a software-programmable antiresonance
algorithm to reduce stepper motor resonance above 2 RPS. The
antiresonance algorithm allows a stepper motor to use more
available torque and run at higher speeds without stalling.
The NI 9503 supports software-programmable microstepping.
Microstepping divides full steps into smaller steps to create
smoother motion. The NI 9503 supports microstepping rates up to
256. When full-stepping, a resonance can occur, causing vibration
and reducing the motor torque. The NI 9503 offers the best
performance when combining microstepping with the torque
smoothing and antiresonance properties. Refer to the
Step Resolver
topic in the
LabVIEW Help
, available by selecting
Help»
LabVIEW Help
, for information about microstepping options.
The NI 9503 allows for phase current reduction after the motor
stops moving. Unlike servo motors, stepper motor coils remain
fully energized when the motor is not moving. This allows for
strong holding torque, but generates substantial heat in the motor.
Many applications do not require maximum holding torque when
the motor is at rest, which means that the motor is wasting power.
The amount of current reduction and delay before current