Stepping motor having external rotor and electromagnetic-combine

Details Stepping motor having external rotor and electromagnetic-combine Stepping motor having external rotor and electromagnetic-combine

1998-01-02

2000-04-18

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

310181, 310184, 310185, 310259, H02K 3714

Patent

active

060518987

ABSTRACT:
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, 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 of the stator elements consisting of two sets of three-phase windings each wound around 3 n pieces of stator magnetic pole among the 6 n pieces of stator magnetic pole. A mechanical degree angle formed between the adjacent magnetic poles in the 3 n pieces of magnetic pole with each set of three-phase windings is 60.degree. m
and a mechanical degree angle formed between the 3 n pieces of magnetic pole with each set of three-phase windings is (60.degree. m
-.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.

REFERENCES:
patent: 4347457 (1982-08-01), Sakamoto
patent: 4763034 (1988-08-01), Gamble
patent: 4910475 (1990-03-01), Lin
patent: 5410200 (1995-04-01), Sakamoto et al.
patent: 5532531 (1996-07-01), Sakamoto

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