The new SJ300 Inverter
are among the most powerful of their class. Hitachi's unique "Advanced
Sensorless Vector Control" (ASLV; patent pending) offers
200% starting torque and full torque at zero Hz – without
feedback. The integrated Hitachi 32-bit SuperH RISC processor
delivers the dynamic response needed for high-end applications.
To compensate possible temperature fluctuations within the motor,
which might adversely affect smooth control of the motor, an online/offline
motor-autotuning function is included. A newly developed internal
control process leads to drastically reduce any rotational fluctuation
at low speed, which enhances process stability and precision.