Electric Machinery 电机学 英汉双语 教学课件 ppt 作者 刘慧娟 英文课件 Chapter3-AC machine Fundamentals

er coil.Р3. Pole pitch ? The distance (in number of slots) between two adjacent poles is called pole pitchР Р4. Coil pitch y1 ? The width of each coil is called coil pitch, and the distance (in number of slots) between two sides of a coil is called coil pitch y1. If a coil spans 180 electrical degrees, i.e. y1=, the voltages in the conductors on either side of coil will be exactly the same in magnitude and opposite in direction at all times, such a coil is called full-pitch coil. If y1<, such a coil is called fractional-pitch coil, or short-pitch coil. If y1, the coil is called long-pitch coil.Р5. Slot pitch ? The electrical degree between two adjacent slots is called slot pitch , which can be expressed byР6. The number of slots per pole per phase q Рwhere m is the number of phases