外文翻译--高速数控齿轮磨床的一种无噪音磨削主轴英文版.pdfVIP

A Noise-Free Servo-Spindle for High-speed NC Gear Grinding Machines Takashi Emura, Lei Wang, Hisashi Nakamura, Masashi Yamanaka and Yasushi Teshigawara Department of Mechatronics and Precision Engineering, Tohoku University Aoba, Aramaki, Aobaks, Sendai, 980-77 Japan Abstract- The authors developed a productive type NC (Numerically describe about the case of grinding-spindlein the followings. Controlled) gear grinding machine for automobileplants, This NC ma- The grinding-spindleis driven by a high-power brushless ser- chine requires high-accuracy synchronization between the grinding spin- vomotor. Since the maximum output voltage of the servo- dle and workspindle. We must use high-power servomotors and servo- amplifiers to satisfy the specification required for high-speed grinding. amplifier is limited to 200 V and the rated power of the ser- However, since the high-power servo-amplifier causes very large ripple vomotor is 22 kW, the current of field coil has to be more than of motor current at PWM (Pulse-Width Modulation) frequency and in- 200 A at a peak load. For this large current, a wire diameter of duces strong noise, it becomes difficult to get the stable synchronous rota- tion among spindles. Therefore, the authors tried to use two-phase type field coil became large, and the number of turns became a few P U to achievenoise-free high-speed synchronous spindles and to reduce because of the limitation of winding space. Thus inductanceof the noise caused by the current ripple with a kind of current filter. In this paper, an approach for suppressingthe noise and experimental results are the field coil was constrained to a very small value. The mea- descrlbed. sured inductance of one phase is about 30 pH at l kHz and it