Abstract: A motor with a built-in capacitor is proposed. The capacitor is formed into a ring so that a shaft of the motor penetrates a center portion of the capacitor and is disposed in the motor so that the shaft of the motor penetrates the center portion. The capacitor is mounted at the same time as the motor is mounted and the mounting work of the capacitor is easy. The external shape of the motor itself is the same as that of a conventional motor. The whole structure of the motor is compact as compared with the conventional motor. The motor can be applied to a motor with a capacitor directly connected to a gear mechanism such as a transmission.

Abstract: It is an object of the present invention to provide a linear pulse motor capable of being configured even if the number of salient poles of a stator is odd and having increased ampere-conductors of a winding and large driving force. The linear pulse motor includes a stator having a plurality of salient poles 11, 12, . . . 15 disposed at equal pitch angle and having an inner peripheral surface on which teeth 16 are formed in the direction of a shaft 16, and a mover 2 disposed movably in the shaft direction. A stator core 10 includes stator iron plates 30 laminated while rotated successively by the equal pitch angle of the salient poles. When k is an integer equal to or larger than 1, m is the number of phases, and n is equal to or smaller than m/2 and nearest to m/2, the stator iron plates 30 has km salient poles P1, P2, . . . P5.

Abstract: A linear pulse motor of the present invention comprises a stator core 10 having salient poles with teeth in the axial direction on the inner peripheral surface, stator windings W2 and W4 wound around each salient pole, and a mover which can move freely in the axial direction in the stator. The mover includes magnetic pole blocks 22 and 34 having teeth in the axial direction on the outer peripheral surface thereof and a permanent magnet 40 magnetized to a predetermined polarity. The aforesaid two magnetic pole blocks are arranged in an opposed relationship with respect to each salient pole via a circumferential gap. The magnetic pole block is magnetized to different polarity from each other by the permanent magnet disposed in the mover core. When the tooth tops of one magnetic pole block are opposed to the tooth tops of the salient pole, the tooth tops of the other magnetic pole block are opposed to the tooth bottoms of the salient pole.

Abstract: It is an object of the present invention to provide a linear pulse motor which can increase the number of ampere conductors and attain a multi-phase configuration with a uniform magnetic circuit without increasing the length in the axial direction. The linear pulse motor includes a stator composed of two stator cores having 2.multidot.k.multidot.m salient poles disposed radially in an inner peripheral surface, a permanent magnet held between the stator cores and having a thickness such that a distance between centers of small stator teeth is (N+0.5) times of a tooth pitch and stator windings wound to bestride two salient poles of the stator cores, and a mover including a cylindrical core. Small teeth in the form of ring are disposed in the mover or the stator at equal pitch in the axial direction and small teeth disposed in the axial direction are formed of laminated stator iron plates or mover iron plates each rotated by {(360.multidot.n)/(2.multidot.k.multidot.m)} degrees.

Abstract: A five-phase stepping motor system includes phase windings connected in series with each other to form a ring and pairs of switching devices connected in series with each other, with each pair having an intermediate connection connected to a corresponding junction between the phase windings. One switching device of each pair is connected to a positive pole of a d.c. power source and the other switching device is connected to a negative pole of the power source. The switching devices are turned on and off to connect two junctions to the positive pole of the power source and to connect two junctions to the negative poles of the power source. The switching devices in the remaining pair isolate the remaining junction from the power source. Exciting signals are applied to the switching devices so that the junction in the opened state is shifted to other junctions every pulse.

Abstract: A driving circuit for a multi-phase stepping motor including an odd number of phase windings which are sequentially connected in series to each other so that a starting end of one winding is connected to a terminating end of an adjacent winding to form an annular connection, comprises switching means each connected to a junction between two adjacent windings, and each junction is connected to a positive pole or a negative pole of a drive power source through the switching means or is not connected to any sides of the power source by means of each switching means. The switching means are alternately and repeatedly controlled so that the total number of the junctions connected to the positive pole or the negative pole of the power source when the motor is driven is two or three, or the switching means are controlled so that two or three junctions are alternately and repeatedly connected to the positive pole or the negative pole of the power source each time an input pulse is supplied.

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.

Abstract: The rotor of a stepping motor is formed of a shaft, a cylindrical magnet, first core pieces having an inside diameter substantially equal to the diameter of a rotor shaft and having a number of teeth on the periphery and second core pieces having an inside diameter substantially equal to the outside diameter of the magnet and having a peripheral contour similar to that of the first core pieces. A cylindrical jig is provided having ribs longitudinally formed on the inner peripheral wall which guide the teeth on the periphery of the ring-shaped core pieces. A predetermined number of the first and second ring-shaped core pieces are stacked in succession, in the bottom of the jig and one end portion of magnet is then fit into the hollow of the stack of core pieces.