Abstract: A stepping motor has a relationship between an outer diameter of a rotor and an outer diameter of a bearing made of magnetic material that can be adjusted appropriately so as to impart magnetic attractive force to the bearing, the stepping motor including a rotor 400 made of a permanent magnet, a stator 500 including multiple pole teeth 223, 243, 323 and 343 extending in an axial direction of the rotor arranged at an outer circumferential side of the rotor 400, a bearing 250 rotatably supporting one end portion in the axial direction of the rotor 400, and a bearing 260 rotatably supporting the other end portion in the axial direction of the rotor 400.

Abstract: A high acceleration rotary actuator motor assembly is provided comprising a plurality of phase motor elements provided in tandem on a shaft, each phase element including a rotor carrying magnets which alternate exposed poles, the rotor being connected to the shaft and surrounded by a stator formed of a plurality of interconnected segmented stator elements having a contiguous winding to form four magnetic poles, the stator being in electrical communication with a phase electric drive unit, wherein each of the poles exert a magnetic force upon the magnets carried by the rotor when the poles are electrically charged by the phase electric drive unit. The rotors and magnets of each phase motor element are offset about the shaft from one another. In addition, the phase motor elements are electrically isolated from one another.

Abstract: A stepping motor includes a rotor having a rotor magnet fixed to a rotating shaft, a plurality of coil bobbins where coils are wound, a stator yoke group having a plurality of stator yokes each of which surrounds each of the plurality of coil bobbins in an axial direction and a radial direction of the rotating shaft, and the plurality of stator yokes each having pole teeth alternately arranged in a circumferential direction around the rotating shaft so as to be opposed to a side surface of the rotor magnet, and a magnetic attractive force generating member configured to attract the rotor magnet to the axial direction of the rotating shaft by a magnetic attractive force, and a magnetic center of the rotor magnet and a magnetic center of the stator yoke group coincide with each other.

Abstract: A high acceleration rotary actuator motor assembly is provided comprising a plurality of phase motor elements provided in tandem on a shaft, each phase element including a rotor carrying magnets which alternate exposed poles, the rotor being connected to the shaft and surrounded by a stator formed of a plurality of interconnected segmented stator elements having a contiguous winding to form four magnetic poles, the stator being in electrical communication with a phase electric drive unit, wherein each of the poles exert a magnetic force upon the magnets carried by the rotor when the poles are electrically charged by the phase electric drive unit. The rotors and magnets of each phase motor element are offset about the shaft from one another. In addition, the phase motor elements are electrically isolated from one another.

Abstract: Disclosed herein is a PM type step motor used to move a camera or an optical pickup lens of media related equipment. The step motor has a stator unit including first and second stators which butt against and are coupled to each other and each have a bobbin and a yoke attached thereto. Terminal blocks of the first and second stators are spaced apart from each other when the first and second stators are coupled to each other, thus allowing an automatic winding operation using winding equipment to be easily performed. The step motor includes a bushing which has in a central portion thereof a through hole through which a rotating shaft passes and is a two-stage structure having a small outer diameter part and a large outer diameter part, thus allowing the stator unit, the rotating shaft and a casing unit to easily be arranged coaxially.

Abstract: The present invention relates to a stepping motor with a magnet pole pattern having a predetermined pattern around the circumference of the stepping motor. In one embodiment, the pattern relates to a code having a unique single maximum autocorrelation peak over the period of the code. Example codes include Barker codes, PN codes, Kasami codes, Golomb ruler codes, and other codes. In one embodiment, the rotor and stator have a matching pole pattern. In one embodiment, the drive is arranged to align the poles in an inline configuration, alternatively, the drive may be arranged to align the poles in a diagonal configuration. In a further embodiment, one or more sets of poles are provided on the stator, each set being offset rotationally by a partial pole spacing.

Abstract: Disclosed herein is a PM type step motor used to move a camera or an optical pickup lens of media related equipment. The step motor has a stator unit including first and second stators which butt against and are coupled to each other and each have a bobbin and a yoke attached thereto. Terminal blocks of the first and second stators are spaced apart from each other when the first and second stators are coupled to each other, thus allowing an automatic winding operation using winding equipment to be easily performed. The step motor includes a bushing which has in a central portion thereof a through hole through which a rotating shaft passes and is a two-stage structure having a small outer diameter part and a large outer diameter part, thus allowing the stator unit, the rotating shaft and a casing unit to easily be arranged coaxially.

Abstract: Devices and methods are provided for a rotor assembly and an electric motor. One embodiment for a rotor assembly includes a first rotor including a first interface surface and a second rotor including a second interface surface corresponding to the first interface surface. Also, the first rotor is positioned with the first interface surface in direct physical contact with the second interface surface of the second rotor.

Abstract: To realize reduction in vibration and noise while utilizing reluctance torque, a rotating electrical machine includes: a rotor having permanent magnets disposed in a cylindrical surface coaxial with a rotary shaft; and a stator having an annular stator core disposed coaxially with the rotary shaft, and a annular coil for magnetizing the stator core. The stator core has an annular part covering the annular coil, claws disposed at equal intervals in an inner radius surface of the annular part and extending axially, and magnetic gaps formed between neighboring claws. The number of claws is equal to the number of permanent magnets, and magnet flux in a direction orthogonal to a center axis of the magnetic pole of the permanent magnet at right angles in electric angle is larger than magnetic flux in the center axis direction generated between neighboring permanent magnets. Metal interpoles are provided between neighboring permanent magnets.