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The present invention relates to a drive element such as a driving wheel for a goods-handling cart or the like, or such as a hoisting winch, the drive element comprising a wheel or a drum and an electric motor for rotating the wheel or the drum. The electric motor is a synchronous motor having a per

The present invention relates to a drive element such as a driving wheel for a goods-handling cart or the like, or such as a hoisting winch, the drive element comprising a wheel or a drum and an electric motor for rotating the wheel or the drum. The electric motor is a synchronous motor having a permanent-magnet rotor and a stator comprising teeth and respective individual windings on said teeth.

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The present invention relates to a drive element such as a driving wheel for a goods-handling cart or the like, or such as a hoisting winch, the drive element comprising a wheel or a drum and an electric motor for rotating the wheel or the drum. The electric motor is a synchronous motor having a per

The present invention relates to a drive element such as a driving wheel for a goods-handling cart or the like, or such as a hoisting winch, the drive element comprising a wheel or a drum and an electric motor for rotating the wheel or the drum. The electric motor is a synchronous motor having a permanent-magnet rotor and a stator comprising teeth and respective individual windings on said teeth. es coupled and the inside yokes coupled are effected to move relative to each other based on magnetic action caused to occur between a magnetic field generated by the closed magnetic path and a magnetic field generated by the coils. 4. A linear motor configured with a plurality of voice coil-type linear motor units arranged in parallel to each other, comprising: inside yokes arranged side by side; magnets separately provided in a plurality of sections on the inside yokes along the respective axial directions thereof; and outside yokes having cylindrical hollow portions, into which the inside yokes are inserted, and having coils wound on the inside of the hollow portions correspondingly to the magnets separately provided in the plurality of sections, wherein the magnets are magnetized to a single pole in surfaces facing the coils, and are configured such that the magnets of the voice coil-type linear motor units adjacent to each other may be of magnetic poles different from each other, a closed magnetic path is formed by the outside yokes, the inside yoke, and the magnets, by feeding current through the coils, the outside yokes coupled and the inside yokes coupled are effected to move relative to each other based on magnetic action caused to occur between a magnetic field generated by the closed magnetic path and a magnetic field generated by the coils. 5. A linear motor, comprising: a movable unit comprising an outside yoke having a cylindrical hollow portion and an annular magnet fixed so as to cover nearly all surface of the inner peripheral surface of the hollow portion; and a fixed unit comprising a column-shaped inside yoke and a coil wound around an outer periphery portion of the inside yoke, wherein the movable unit and the fixed unit are arranged side by side, respectively in plural pairs, opposite ends of the plurality of the fixed units are coupled by individual auxiliary yokes, and the outside yokes are face-joined to each other such that the inner peripheral surfaces of the magnets of the movable units adjacent to each other may be of different magnetic poles, and guide mechanisms for holding nearly uniform gaps between the outer periphery portions of the coils and the inner peripheral surfaces of the magnets are provided between the side of the auxiliary yokes and the outside yokes. 6. A linear motor, comprising: a movable unit comprising an outside yoke having a cylindrical hollow portion and an annular magnet, fixed so as to cover nearly all surface of the inner peripheral surface of the hollow portion; and a fixed unit comprising a column-shaped inside yoke and coils separately wound in two sections around the outer periphery portions of the inside yoke, wherein the fixed units is arranged side by side, four movable units are mounted to face the coils of four sections such that the inner peripheral surfaces of the magnets adjacent to each other may be of different magnetic poles, and opposite ends of the fixed units are coupled by coupling blocks, and the outside yokes of two sets of the movable units arranged side by side are face-joined to each other, and the motor further comprises: holding means for coupling between two face-joined movable units to hold a constant spacing of one movable stroke between them, and guide mechanisms, provided between the side of the coupling blocks and the outside yokes, for holding uniform gaps between the outer periphery portions of the coils and the inner peripheral surfaces of the magnets. 7. A linear motor, comprising: a fixed unit comprising an outside yoke having a cylindrical hollow portion and an annular magnet fixed so as to cover nearly all surface of the inner peripheral surface of the hollow portion; and a movable unit comprising a column-shaped inside yoke and coils wound around the outer periphery portion of the inside yoke, wherein the movable unit and the fixed unit are arranged side by side, respectively in