The high-performance magnets and a new method for winding the stator reduce motor volume by 50% and weight by 35%. The motors/drives employ sinusoidal motor-current waveform, instead of trapezoidal waveform, to achieve low-torque ripple, low vibration and acoustic noise, and reduced harmonics.
Hitachi America Ltd., Power and Industrial Div., 50 Prospect Ave., Tarrytown, NY 10591, (914) 631-0600, hitachi.us
