Outer rotor type hybrid stepping motor

Details Outer rotor type hybrid stepping motor Outer rotor type hybrid stepping motor

2004-08-19

2008-11-04

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

Reexamination Certificate

active

07446441

ABSTRACT:
An outer rotor type hybrid stepping motor including a stator, a rotor, a magnet disposed axially in either the stator or rotor, a stator core disposed inward from a gap formed between the stator and rotor, the rotor disposed outside the gap, and a stator winding wound around the stator core. The outer rotor type hybrid stepping motor has a cross-sectional area A in the axial direction of the magnet, a gap portion diameter D, a lamination thickness of the stator core in the axial direction L and a residual magnetic flux density of the magnet Br. The lamination thickness of the stator core in the axial direction L and the residual magnetic flux density Br are determined according to the equation D×L/A=k×Br with the condition that coefficient k is kept in a range of 0.56-0.66(1/T). The resulting optimized design parameters for L and Br provide a reduction in size of the outer rotor type hybrid stepping motor, a high output and a high resolution.

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patent: 6034450 (2000-03-01), Kojima et al.
patent: 6441522 (2002-08-01), Scott
patent: 2003/0102727 (2003-06-01), Sakamoto
patent: 2003-070222 (2003-03-01), None
Practical Motor Design Manual (1992); Author: Toshiba, Small Motor Study Group; Publisher: Sogo Electronic Research Co.

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