MICA TAPE, ROTARY ELECTRIC COIL MAKING USE OF THE SAME, AND ROTARY ELECTRIC EQUIPMENT INCLUDING THE ROTARY ELECTRIC COIL

摘要

A mica tape comprising mica foil (12), glass cloth (14) and inorganic filler (16) disposed on the glass cloth, the mica tape wound in multiple layers round a circumference of conductor portion of rotary electric coil to thereby form insulating layers, wherein as the inorganic filler (16), use is made of an inorganic filler whose Mohs hardness is in the range of 1 to 7 and whose thermal conductivity is superior to those of mica foil (12) and glass cloth (14). By virtue of the addition and use of inorganic filler with excellent thermal conductance and with Mohs hardness equivalent to or lower than that of the glass cloth of mica tape employed, even when the tape is wound round a conductor portion under application of given tension, the inorganic filler would not injure the glass fiber as a base material of mica tape. Accordingly, there can be formed insulating layers free from any breakage of mica tape and capable of maximum exertion of high thermal conductance possessed by the inorganic filler.