Main Characteristics - Fastech Ezi-STEP-BT-42 Series Operating Manual

2. Main Characteristics

1
Step-Out Detection(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, the current, and
the back-emf signal, the on-borad DSP estimates the
current position of a rotor and enables to detect the
loss-of-synchronization (so far seemingly impossible
task in a conventional stepping motor drive), in turn
realizing operation in high-speed region without
worrying about loss-of-synchronization*.
* effective only over 300 rpm
2
Microstep and Filtering(patent pending)
High Precision microstep function and Filtering (Patent pending)
The high-performance DSP resolves the basic resolution of
Contrary to a conventional driver, Ezi-STEP adjusts PWM control signal in every 25 usec, which makes
it possible to more precise current control and realizes a high-precision microstep operation.
3
Software Damping(patent pending)
Vibration suppression and High-speed operation (Patent pending)
Ideally the applied currents to a stepping motor are a precise sinusoidal waves. But in practice the
magnetic flux nonlinearity of the motor, the lowering of current due to the increase of back emf at high-
speed and the lowering of the phase voltage are the sources of motor vibration.
For these practice Ezi-STEP detects these nonlinearity with DSP and adjusts the phase of the current
according to the pole position of the motor, drastically suppressing vibration. As reducing the vibration of
the motor, it is possible to operate in high-speed regime.
* This is real measured speed that using 100000[pulse/rev]encoder.
Software Damping OFF
Torque
300
1.8。 up to maximum 0.0072。 (1/250 steps).
Software
Damping
Software Damping ON
Detecting area of
loss-of-synchronization
(rpm)
5