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FASTECH Co.,Ltd.
Sensorless Stall Detection
1
High precision Microstep function and Filtering (Patent pending)
The high-performance DSP operates at step resolutions of 1.8°up to maximum 0.0072°(1/250
steps) and Ezi-STEP
®
adjusts PWM control signal in every 25μsec, which makes it possible for
more precise current control, resulting in high-precision Microstep operation.
Microstep and Filtering
2
2. Main characteristics
Software Damping
3
Detecting the loss-of-synchronization with
on-board DSP (Patent pending)
Ezi-STEP
®
can detect the loss-of-synchronization
of a stepping motor without the addition of an
external sensor. By monitoring the voltage, current,
and back-emf signal, the on-board DSP estimates
the current position of a rotor and enables it to
detect the loss-of-synchronization (an impossible
task for a conventional stepping motor drive), this
allows for high-speed operation at 100% torque
rating without loss-of-synchronization*.
*Effective only over 300rpm
Vibration suppression and high-speed op-
eration (Patent pending)
Vibration suppression and High-speed operation
(Patent pending) Motor vibration is created by
magnetic flux variations of the motor, lower current
from the drive due to back-emf from the motor at
high speeds and lowering of phase voltages from
the drive. Ezi-STEP
®
drive detects these problems
and the DSP adjusts the phase of the current
according to the pole position of the motor, drasti-
cally suppressing vibration. This allows the smooth
operation of the motor at high speed.
