Outer rotor type step motor

Abstract

The present invention relates to an outer rotor type step motor, and particularly to the outer rotor type step motor described as follows. The outer rotor type step motor is composed of a stator and a rotor. The stator is composed of a plurality of cores. Each core is provided with pole teeth with an arc surface at the end. A coil is wound on the outer peripheral surface of an extension part which extends from the pole tooth with width larger than the pole tooth for extending. An annular magnet with magnetic poles formed through the alternation of N-poles and S-poles with a certain space (clearance) from the outer peripheral surface of the stator. Furthermore the outer peripheral surface of the magnet is provided with a housing used for protecting the magnet. Furthermore through an outer electrical signal exerted to the stator, the rotor is rotated by means of the rotation of rotating shafts provided on the housing and the central shaft of the stator, wherein, the outer rotor type step motor has following advantages: improved ratio between volume and torque, simple structure, simplified manufacturing process and reduced production price.

Description

technical field [0001] The present invention relates to an outer rotor type stepping motor (Outer Rotor type Step Motor), and particularly relates to an outer rotor type stepping motor as follows: composed of a stator and a rotor, the stator is composed of a plurality of cores on which end A pole tooth whose part is an arc surface is extended by winding a coil on the outer peripheral surface of the extension part extending from the pole tooth with a width narrower than that of the pole tooth, and is spaced from the outer peripheral surface of the stator on the rotor. The ring magnets whose magnetic poles are alternately formed by N poles and S poles are arranged at a certain interval (gap), and a case for protecting the above magnets is arranged on the outer peripheral surface of the above magnets, and by an external electric signal applied to the above stator, The above-mentioned rotor is rotated by means of the rotation of the rotating shaft provided on the above-mentioned c...

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Problems solved by technology

[0005] This is because, in terms of motor torque, it is related to the interlocking area of ​​the rotor and stator and the design of the coil wound on the stator. Since the interlocking area of ​​the stator coil and the interstitial part of the inner rotor type stepping motor is bounded, so Although the general external rotor type motor can be improved in the above-mentioned torque, there is a problem that it cannot be lowered in terms of structure.

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