Abstract: A reluctance type motor comprising a rotor (1), which has n units (n is an integer of 2 or more) of salient poles (1a, 1b).of the same widths and arranged at regular intervals, and a stator armature (16) including a polyphase magnetic poles (16a, 16b, 16c, . . . ) with armature coils (9a, 9b, 9c, . . . ) arranged confronting the outer periphery of the rotor (1). Two sets of adjacent magnetic poles (16a-16b, 16b-16c, . . . ) are successively excited to magnetically attract the salient poles (1a, 1b) so that all of the salient poles act to contribute to torque output without interruption.

Abstract: A plurality of projections (15a), half-projections (16a), and recesses (18a), each having a width equal to an electrical angle of 120 degrees, are formed on the outer peripheral portion of a conductor disk (15) that rotates synchronously with a motor. A coil (10a) that faces only the projections (15a) and a coil (10b) that faces the projections (15a) and the half-projections (16a) are fixed to a stationary armature. Three-phase position detection signals are obtained in accordance with the mode of change in impedances caused when these two coils (10a, 10b) face the outer peripheral portion of the conductor disk (15).

Abstract: A magnetic rotor (5) is provided inside a stator armature (1) of a reluctance motor with an air gap between them. Two salient poles (5a, 5b), each having a width that is 2.5 times each of angular intervals among adjacent slots (1a, 1b, . . . , 1h) of the stator armature (1), are arranged on the outer peripheral portion of the rotor (5). Magnetic fluxes generated by energizing armature coils (2h, 2d) of magnetic poles (4h, 4d) that are not situated at positions where torque is produced are added to magnetic fluxes generated by energizing armature coils (2a, 2e) of magnetic poles (4a. 4e) that are situated at-positions where torque is produced in a direction indicated by arrow R. As a result, leakage fluxes Fa, Fb between the magnetic poles (4a, 4e) and the salients (5a, 5b) of the rotor (5) increase, causing the torque to increase.

Abstract: A three-phase reluctance type motor flat in shape and capable of generating a large output torque and rotating at high speeds, comprising a flat stationary armature (16) having a circumferential surface provided with three multiplied by integral number of magnetic poles wound by first, second and third phase armature coils, salient poles of a magnetic rotor (1) fixed to the inside of the outer periphery of a cup-shaped rotor (3), and a current supply control circuit for obtaining first, second and third phase position detecting signals responsive to the position of the salient poles and for quickly supplying current to the first, second and third phase armature coils based on these position detecting signals, so as to realize a high-speed rotation.

Abstract: At the periphery of a rotating disk (15) rotating in synchronization with an electric motor, first, second, and third sections (11a, 12a, . . . ) with different physical properties are disposed in sequence. Each of these first, second, and third sections has a width of an electrical angle of 120 degrees. One position detecting element (10) fixed to the motor body faces the first, second, and third sections, and as each section passes the element, a 3-phase position detecting signal corresponding to the section is obtained.

Abstract: A current supply control circuit for a reluctance motor supplies armature coils with current flowing in both forward and backward directions. The reluctance motor has a fixed armature having a magnetic pole wound repeatedly with armature coils of plural phases. The current is supplied to the armature coils in a reciprocative manner such that both ends of an armature coil of each phase are connected to positive and negative side switching elements through a plurality of diodes, connected in a forward direction.

Abstract: An object of the present invention is to obtain a reluctance-type motor which generates small vibration, rotates at a high speed, generates a large output torque, and provides a flattened torque characteristics. A rotor is provided with n (n is a positive integer not less than 2) salient poles having the same width and equally spaced at regular angles, and a first fixed armature is provided with magnetic poles confronting the outer peripheral surface of the rotor. The magnetic poles are wound by three- or two-phase armature coils. A second fixed armature and its associated rotor with salient poles are provided to add an output torque eliminating ripple torque of the output torque generated by the first fixed armature.

Abstract: An object of the present invention is to obtain a reluctance-type motor which is small in diameter and has good efficiency in a high speed region, or generates a large output torque without causing vibration, and allows regenerative braking as occasion demands. A magnetic rotor has two salient poles. A fixed armature has eight slots disposed at regular intervals. These eight slots are associated with No. 1-, No. 2-, No. 3-and No. 4-phase armature coils of two-phase full-wave current supply mode, so as to constitute a compact small-diameter motor. Each armature coil is supplied with current by an amount of 90-degree electric angle in response to a position detecting signal. Thus, a maximum torque can be obtained with good efficiency. Using electrostatic energy of a small-capacitance capacitor, transformation of magnetic energy of each armature coil can be completed in a short time. As a result, the motor can rotate at a higher speed.

Abstract: A reluctance type motor and a brushless DC motor having large torque and good efficiency in a high-speed region.When one exciting coil or armature coil is deactivated, magnetic energy stored in the magnetic core is prevented from returning to the electric power source side by means of a back-flow preventing diode. The magnetic energy is charged in a small-capacitance capacitor so as to hold it at a high voltage, thereby causing exciting current to decrease steeply. After a predetermined time has elapsed, a next exciting or armature coil is activated. In this case, the high voltage charged in the capacitor is applied, so that the exciting current builds up sharply.

Abstract: Armature current is maintained at a predetermined level by a chopper circuit, and part of the magnetic energy stored in magnetic cores of armature coils is transferred to a small-capacitance capacitor to be stored as an electrostatic energy in accordance with a chopper frequency when the armature coil is deactivated. The charged electrostatic energy is utilized to compensate energy loss such as iron loss and copper loss occurring when activation of the armature coils is switched so as to make the armature current build up quickly, thereby realizing a reluctance type motor capable of operating in a high-speed region with large torque. The above-described technical feature can be applied to a three-phase DC motor with a magnet rotor and a stepping motor in the same manner to obtain similar function and effect.

Abstract: A reluctance type motor capable of rotating at a high speed with a large output torque includes transistors (20a.about.20f) connected to both ends of respective phase exciting coils (39a.about.39c), a current supply control circuit for successively activating the exciting coils in response to position detecting signals representing the rotational positions of a rotor, and diodes (21a.about.21f) connecting the exciting coils and capacitors (47a.about.47c). When a current supply to the exciting coil is stopped, one of the capacitors is promptly charged with the magnetic energy stored in the exciting coil to rapidly extinguish the magnetic energy and also an exciting current supplied to a subsequently activated exciting coil is rapidly built up by use of a charged voltage in the capacitor.

Abstract: A reluctance type motor capable of rotating at a high speed with a large output torque has transistors (20a-20f) connected to both ends of phase exciting coils (39a-39c), a current supply control circuit for successively activating the exciting coils in response to position detecting signals, which represent rotor rotational positions to be detected by position detecting elements, and diodes (21a-21f) connecting the exciting coils and capacitors (47a-47c). When a current supply to the exciting coil is stopped, the capacitor is promptly charged by a magnetic energy stored in the exciting coil to extinguish the magnetic energy and also to rapidly build up an exciting current supplied to a subsequently activated exciting coil by use of a charged voltage in the capacitor.

Abstract: The present invention relates to a current supply control apparatus capable of actuating a large inductance load at a low electric power source voltage and also capable of improving a responsibility in a current supply control of the inductance load. When a detecting voltage of an absolute value circuit (10) representing a current value flowing in an exiting coil (1), provided as an inductance load, exceeds a standard voltage, transistors (3a, 3b) interposed between a DC electric power source (2a, 2b) and the exciting coil are turned off, and a magnetic energy stored in the exciting coil is utilized to charge a capacitor (5) up to a high voltage so that a current flowing after the transistors have been turned off is quickly reduced.

Abstract: A three-phase Y-connection direct current motor, which is not only capable of operating at a high efficiency and at high speeds but also small-sized and inexpensive. A position detection device includes three Hall elements for detecting the rotational position of a rotor of the motor, and supplies first-, second- and third-phase position detection signals each having a width equivalent to an electrical angle of 120 degrees and position detection signals having a phase difference of 60 degrees with respect to the corresponding ones of the first-, second- and third-phase position detection signals to an energization control circuitThe energization control circuit successively energizes transistors (10a-10d, 11a-11h) of transistor bridge circuits associated with respective phases of armature coils (4a-4c) to supply a current to the armature coils in forward and reverse directions.

Abstract: The object of the present invention is to obtain a motor capable of producing a large torque and operating with good efficiency in a high-speed region. A reluctance type motor according to the present invention, when one armature coil (32a) is deactivated through one switching element connected to a negative voltage terminal, prevents the magnetic energy stored in the magnetic core from returning to the electric power source by means of a back-flow preventing diode (21a). The magnetic energy is used to charge a small-capacitance capacitor (47a) to hold it to a high voltage. Thus, a trailing-off of current becomes steep. After a predetermined time has elapsed, a next armature coil (32e) is activated. As an applied voltage is a high voltage charged in the capacitor, the exciting current builds up sharply. Since the building-up and the trailing-off of the exciting current of the armature coil can be made sharp, the rotational speed can also be increased up to several 10 thousand rpm.

Abstract: The present invention relates to a three-phase Y-connection brushless DC motor capable of not only rotating at a high speed with good efficiency but also capable of holding its armature current at a predetermined value. Three sets of transistor bridge circuits (10a.about.10d, 11a.about.11d, 11e.about.11h) of the motor are separated into six sets of electric circuits. Six pieces of back-flow preventing diodes (17a.about.17f) and capacitors (16a.about.16f), which are in parallel with the back-flow preventing diodes, are connected to output terminals (2a, 2b) of a DC electric power source, which supplies currents to the respective electric circuits. At a terminal end of a position detecting signal, a magnetic energy stored in the armature coil (4a.about.4c) is converted into an electrostatic energy to charge the capacitor to a high voltage and change its armature current steeply. By virtue of this high voltage, an armature current of a next activated armature coil can be built up sharply.

Abstract: The object of the present invention is to obtain an apparatus for realizing a high-speed numerical control of a load with good efficiency. Required numerical control of a load is carried out in such a manner that the motor drives the load connected to the motor as a DC motor in an initial stage of shifting movement of the load, and, when the braking torque is generated for deceleration, the motor starts to operate as a stepping motor in response to a predetermined number of electric pulses in its final stage. Furthermore, when an armature coil is deactivated while the motor is in operation, a back-flow preventing diode prevents a magnetic energy stored in the armature coil from returning to an electric power source, whereby the magnetic energy is used to charge a small-capacitance capacitor to a high voltage, causing an exciting current to decrease rapidly.

Abstract: A reluctance motor is provided which is small-sized and inexpensive, yet excellent in various operating characteristics such as a capability of highspeed operation, and which can be driven with a battery power supply and thus can be used as a drive source for various devices.

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.