Four-phase hybrid type stepping motor
AssigneeOriental Motor Co., Ltd.
InventorHirobumi Satomi
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Abstract
A four-phase hybrid type stepping motor is disclosed, which comprises a rotor and eight stator poles each formed on a plane facing to an outer side surface of the rotor with a plurality of stator teeth, wherein a pitch between a center of the stator teeth of the first one of the eight stator poles and a center of the stator teeth of the fourth stator pole, a pitch between the center of the stator teeth of the fourth stator pole and a center of the stator teeth of the seventh stator pole and a pitch between the center of the stator teeth of the seventh stator pole and a center of the stator teeth of the second stator pole are common and equal to .tau..sub.c defined as follows: ##EQU1## where Z.sub.R is the number of the rotor teeth and N is an integer close to 3.multidot.Z.sub.R /8.
Claims3
A four-phase hybrid type stepping motor comprising a rotor, eight stator poles are formed on a plane facing to an outer side surface of said rotor with a plurality of stator teeth arranged with a common pitch .tau..sub.s, opposing ones of said stator poles being paired and being separated from each other by 180.degree., and a plurality of windings wound in heteropolar on the four pairs of said stator poles, wherein a pitch between a center of said stator teeth of a first one (1.sub.1) of said stator poles and a center of said stator teeth of a fourth one (1.sub.4) of said stator poles, a pitch between said center of said stator teeth of said fourth stator pole and a center of said stator teeth of a seventh one (1.sub.7) of said stator poles and a pitch between said center of said teeth of said seventh stator pole and a center of said stator teeth of a second one (1.sub.2) of said stator poles are common and equal to .tau..sub.c, said pitches .tau..sub.s and .tau..sub.c being set so that they satisfy the following equations:
- ##EQU4## where .tau..sub.R is a pitch of teeth of said rotor, Z.sub.R is the number of the teeth of said rotor and N is an integer close to 3.multidot.Z.sub.R /8.
Dependencies are inferred from the claim text.