초록 ▼

A rotor composite type three-phase stepping motor having a stator consisting of two stator elements each having 6 n pieces of stator magnetic pole with Ns pieces of pole tooth formed on the tip end of each stator magnetic pole piece, and a permanent magnet held by the two stator elements therebetwee

A rotor composite type three-phase stepping motor having a stator consisting of two stator elements each having 6 n pieces of stator magnetic pole with Ns pieces of pole tooth formed on the tip end of each stator magnetic pole piece, and a permanent magnet held by the two stator elements therebetween, a rotor of magnetic material arranged so as to face to a periphery of the stator through an air gap, Nr pieces of pole tooth being formed on a periphery of the rotor, and exciting windings wound around each stator magnetic pole piece of the stator elements consisting of two sets of three-phase windings each wound around 3n pieces of stator magnetic pole among the 6 n pieces of stator magnetic pole. A mechanical angle formed between the adjacent magnetic pole pieces in the 3n pieces of magnetic pole with each set of three-phase windings is 60.degree. m/n and a mechanical degree angle formed between the 3n pieces of magnetic pole with each set of three-phase windings is (60.degree. m/n-.theta.s), where Nr is a number of rotor pole teeth, each of n, m and Ns is an integer not less than 1, and .theta.s is a step angle of (30.degree.-Nr) k where k is an integer number not less than 1.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of driving a stepping motor comprising a stator having 6 m pieces of stator main magnetic pole extending radially with Ns pieces of pole tooth formed on a tip end of each stator main magnetic pole piece, and windings wound around the stator main magnetic pole p

[ What is claimed is:] [1.]1. A method of driving a stepping motor comprising a stator having 6 m pieces of stator main magnetic pole extending radially with Ns pieces of pole tooth formed on a tip end of each stator main magnetic pole piece, and windings wound around the stator main magnetic pole pieces, anda hybrid type rotor consisting of two magnetic rotor elements arranged so as to face a periphery of the stator through an air gap, Nr pieces of pole tooth being formed on a periphery of each of the rotor elements, wherein phase windings are wound around adjacent three stator main magnetic pole pieces and are connected to form a star connection or a delta connection, the method comprising:exciting the phase windings in order by voltages, a phase of the voltage applied on the winding wound around (n)th main magnetic pole piece being deviated by 30.degree. from a phase of the voltage applied on the winding wound around (n+3)th main magnetic pole piece among the 6 m pieces of the main magnetic poles, where m is an integer and is .gtoreq.1, Ns is an integer and is .gtoreq.1, and Nr is an integer and is .gtoreq.2.