Abstract: The present invention is a stepping motor used as a driving source for stepping movement of autmatic-machine members. Diodes are connected to the terminal side of a DC power source in a forward direction to prevent accumulated magnetic energy from returning to the power source. A high-voltage large current due to reduction of magnetic energy rushes into an exciting coil to be excited, the magnetic energy of the exciting coil quickly decreases, and a high-speed stepping operation is exeuted. Moreover, the digital signal of each address in a ROM corresponding to the number of steps is read, the read digital signal is converted into an analog signal, acceleration is executed by the frequency of the stepping electric signal corresponding to the frequency proportional to the analog signal for the shortest time without outstepping, and deceleration is executed for the shortest time by reading the ROM backward when the number of steps is halved.

Abstract: A three-phase reluctance type electric motor wherein a magnetic attraction force acts on a rotor in one direction and is not cancelled, thereby reducing mechanical vibration. Since the number of magnetic poles and salient poles is small, a small electric motor of small output power can be obtained. Reduction in the service life of the motor due to the magnetic attraction force acting on the bearings can be prevented by disposing three motors in the same casing. This causes the magnetic attraction force in a radial direction due to the central motor and the magnetic attraction forces in a radial direction due to the two outer motors to act in opposite directions and thus provides balance and maintains a preset attraction force. Every two of the magnetic poles of each phase define a N and S pole pair and a motor of high output torque and high efficiency can be obtained.

Abstract: A drive system capable of driving a driven member with a large force and precisely rapidly positioning the same is disclosed, with use of a control unit for efficiently driving a motor with a large torque. Upon storage of target position data from a computer in a counter circuit of a driving mode switching circuit, the driven member is driven at a high speed with a large force via a ball screw/nut mechanism by the motor which efficiently operates as a two-phase reluctance motor at a high speed with large torque. When a count of the counter circuit, decremented with movement of the driven member, reaches a first preset value, supply of a sequence of position detection signals, indicative of the motor rotational position, to an energization control circuit is changed by a signal switching circuit, so that the motor is driven in the deceleration mode until its speed reaches a preset speed, and then the motor is driven at a constant speed.

Abstract: A reluctance-type motor in which two or more three-phase, half-wave reluctance-type motors are juxtaposed within an outer casing (42), the number of magnetic poles (16a, . . .) and salient poles per motor decreases. Accordingly, a long and narrow motor having a small diameter can be obtained. With a construction in which n number of three-phase, half-wave motors are juxtaposed, the output torque is multiplied by n. Further, by providing a phase difference of 120/n degrees for the output torque of each motor, the torque ripple can be made small and the characteristics at the start-up time become good. By feeding back the magnetic energy in an exciting coil to the D.C. power supply of the applied high voltage, the magnetic energy is extinguished rapidly to prevent a counter-torque from occurring, and a magnetic energy is stored rapidly by the applied high voltage to prevent a reduced torque from occurring.

Abstract: The present invention provides a current supply control apparatus for an inductance load which controls the energizing current of an armature coil for a specified waveform when an electric motor is rotating at high speed. Since a great inductance load requires much time for the accumulation and discharge of magnetic energy, a chopper circuit is utilized for high-response current supply control. The current supply control of the inductance load can be achieved with higher responsiveness, despite the use of a lower applied voltage, by means of a diode (6, 6a) for back flow prevention, a small-capacity capacitor (5), etc.

Abstract: A reluctance-type motor which is used as a drive source of industrial equipment, and particularly as a servo motor, wherein an armature current is held at a preset value by chopper control in a section where a position detecting signal is present. Stored magnetic energy of an armature coil is converted to the stored magnetic energy of an armature coil to be energized next, thereby rapidly extinguishing the discharge current and simultaneously making the rise of the energization current of the next armature coil rapid. Accordingly, a motor of a highspeed and torque can be provided. Power is supplied from a D.C. power supply via a forwardly connected diode, and if necessary, a capacitor connected in parallel with the power supply can be additionally used.

Abstract: A reluctance type electric motor, when an energization current in an exciting coil is interrupted at the end of a position detection signal, large magnetic energy stored in the exciting coil is prevented from being fed back to a power source by a reverse current prevention diode (43a, 43b) and it is forcedly caused to flow into an exciting coil to be next energized. Extinction of the stored magnetic energy in the preceding-stage exciting coil and accumulation of magnetic energy in the succeeding-stage exciting coil can be rapidly effected. A high-speed rotation (up to approximately 100,000 r.p.m.) can be attained with high torque obtained. If a plurality of teeth usually used for magnetic poles are provided, an effect that output torque increased by several times can be attached when a normal rotation speed is obtained.

Abstract: A small and inexpensive 3-phase Y-connection direct current motor operable at high speeds with high efficiency. The motor includes a current supply controlling circuit that receives first to third position detection signals from a position detection device having three Hall elements for detecting the position of a rotor, and fourth to sixth position detection signals supplied from the device [and having .currents to the armature coils of respective phases in the forward and reverse directions.

Abstract: A reluctance type electric motor, in which, when the first excitation coil being energized is discontinued of energizing, a reverse current prevention diode is provided to prevent the discharging electric power of the magnet energy of the first excitation coil from returning to DC power source so as to change accumulated magnetic energy into the magnetic energy of the second excitation coil to be energized next, and to quickly discharge the magnetic energy of the first excitation coil and as well as to quickly accumulate the magnetic energy of the second excitation coil. Furthermore, the magnetic energy of the first excitation coil is charged into a small capacity capacitor to obtain high voltage, the magnetic energy of the second excitation coil is accumulated by utilizing such high voltage, and the magnetic energy is quickly discharged and accumulated so as to prevent generation of the reduced torque and counter torque.