Composite type three phase stepping motor
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United States of America Patent
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-
Mar 19, 2002
Issued Date -
N/A
app pub date -
Oct 12, 2000
filing date -
Jan 2, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotor composite type three-phase stepping motor having a stator consisting of two stator elements each having 6n 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 6n 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.
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