A stepping motor having at least one stator with circularly disposed and equally interspaced poles. A rotor is provided which coacts with the stator and is rigidly connected to a rotatable shaft. The rotor has a number of teeth which corresponds to the number of stator poles, however the pole faces of the rotor teeth are of a different form and size than the pole faces of the stator poles whereby the torque generating intersecting line between the pole faces of the stator poles and the rotor tee...

A stepping motor with a first and a coaxially disposed second stator section. The stator sections are axially separated by a coaxially disposed permanent-magnetic ring. On the inside, each stator section terminates in two coaxially disposed annular systems of teeth. The systems of teeth of each stator section have been shifted nominally by 1/2 tooth pitch relative to the rotor teeth and the systems situated on the outside relative to the permanent magnetic ring as well as the systems of teeth si...

A stepping motor includes a single piece rotor with shafts connected thereto on each end of the rotor, and a pair of coils circumventing the rotor and encased within stators, which stators are positioned adjacent the rotor and spaced from each other. The energization and de-energization of the respective coils provides for one complete step of operation by the pulsing of one coil under stated conditions.

A multiphase rotary stepping motor of the type having a shaft with the rotors distributed axially thereon, and a housing carrying the axially distributed stators, the rotors and stators having their respective pole-forming elements separated by axial air gaps. The shaft is mounted for rotation in the housing by a bearing arrangement which includes an axially fixed bearing, such as a duplex bearing, located at one end of the motor to restrict axial motion of the shaft, and an axially floating bea...

A stepping motor in which a rectangular stator core in the shape of a square frame has poles in the center of the inner side edges of sides thereof, four coils are wound on the poles of stator core, and a rotor is disposed in the space surrounded with the coils and having the height of each of poles being made 0.24 to 0.5 times as much as the outside diameter of the rotor. Each of poles has at the end thereof a plurality of projections according to a step angle. The rotor has projections on the ...

This invention relates to an improvement in a stepping motor composed of a stator housing containing annularly arranged electromagnets or coils with pole pieces and a magnetically conducting rotor composed of a flexible membrane solidly connected to an annular armature plate and connected to a drive shaft axially supported within the stator housing, the rotor being provided at its periphery with a toothed rim, the improvement comprising, in addition to the rotor (5), a second rotor (11) mounted ...

In the disclosed motor, a stator and a rotor are movable relative to each other about a common axis. The stator has stator poles with radially directed stator teeth arranged in a circle around the axis and the rotor includes a first axial portion and a second axial portion with a permanent magnet located between them. The first portion has a plurality of rotor teeth extending axially along the periphery of the first portion and the second portion has a substantially cylindrical surface.

A compact stepping motor is equipped with at least four stator plates positioned in parallel with each other, a rotor with a rotary axis perpendicular to the stator plates, and at least two energizing coils each positioned between each two of the stator plates. The rotor is positioned out of the energizing coils. The center axes of the coils and the rotary axis of the rotor are in parallel with each other. One coil is positioned between one pair of stator plates and one coil is positioned betwee...

Relating to a stepping motor to be used for paper feedings or type head movements in office automation apparatus such as printers or typewriters. A stator (1) is constituted by moulding stator yokes (2), (3), (4), and (5) monolithically by resin with using their inner radius as their reference, and one side of a rotary shaft (11a) of a rotor (11) is supported by a bearing (12a) of a bearing holder member (1a) which is provided on the one-side end plane of a cylinder member of sad stator (1), and...

A stepping motor having a rotary shaft carrying a rotor, a stator, a housing encasing the rotor and a part of the rotary shaft and supporting the stator, and a signal system comprising a signal member provided on the rotary shaft and a sensor so disposed on the housing as to detect the passage of the signal member to produce a signal each revolution of the rotary shaft. The signal member can be a radially extending lug on the rotary shaft or a disc on the rotary shaft with a hole through the dis...