A MOTOR PRIMER Baldor ProSPEC（汽车底漆美国宝德公司ProSPEC）.pdf

A MOTOR PRIMER Part 1 Gary Donner Bill Subler Steve Evon Senior Member IEEE Member IEEE Reliance Electric Texaco Inc. Reliance Electric 101 Reliance Rd 2101 E Pacific Coast Hwy 101 Reliance Rd. Kings Mountain, NC 28086 P.O. Box 817 Kings Mountain, NC 28086 Wilmington , CA 90748 0817 Abstract: In recent years much has been written about power supply are displaced by 120°. The current in phase applying motors on Variable Speed Drives, high speed A reaches its positive maximum 120° ahead of phase B, rigid shaft motors, impact on API Standard 541, motor and the current in phase B will be 120° ahead of phase C. diagnostics and etc. Most of these papers and articles A plot of three-phase current of an induction motor can be assume that the reader has significant knowledge of motor seen in figure 1. theory and operation. However, this assumption is overly optimistic, considering that few, if any colleges teach Figure 1 motor theory today and that application experience at Time 1 Time 2 Time 3 Time 4 motor user locations has been reduced in recent years. This paper is the first of a series of papers. The authors will present motor theory and application information t