Abstract: An apparatus for use in an automatic door system. Means are provided which compares the current position of the running door with a deceleration point to generate a low speed command upon their coincidence. A speed control responds to decelerate the door to a selected low speed. A measuring device measures a variable run-length of the door which is subject to variations in the mechanical condition of the door. In one embodiment, the device measures a low speed run-length over which the door has moved at a low speed. A comparator compares the measured low speed run-length with a preselected optimal low speed run-length to obtain error or departure from the optimal value. A correction logic produces an updated deceleration point by removing the error from the former deceleration point.

Abstract: A circuit for controlling the energization of an electrical load from an AC source. The circuit has a pair of DC lines, and means is provided for rectifying the AC output of the source to apply a DC voltage across the DC lines in the form of a full wave rectified sinusoidal signal. Signal switching means for connection between the DC lines and the load establishes a conductive path therebetween during a variable time interval when the voltage applied by the full wave rectified sinusoidal signal exceeds the voltage across the load, and means including the switching means is provided for chopping the full wave rectified sinusoidal signal to apply pulses to the load during the variable time interval at a frequency which is high with respect to the frequency of the signal.

Abstract: An elevator group control system in which, in response to origination of a new hall call, a floor-stop call evaluation factor indicative of the degree of saving of power consumption is computed besides a serviceability evaluation factor indicative of the passenger serviceability, for example, the waiting time. One of these evaluation factors is weighted relative to the other to compute an allocation evaluation factor indicative of the suitability of allocation of the new hall call to one of the elevator cars, and the new hall call is allotted to the elevator car which is decided to be most suitable for the service in respect of the value of the allocation evaluation factor.

Abstract: An improvement is disclosed in which a circuit utilizes the internal resistance or bulk resistance of a Hall generator in connection with an amplifier having a feedback resistance which is less or larger than the internal resistance or bulk resistance of the Hall generator. By utilizing this improvement, changes in output voltage of the Hall generator caused by variations in temperature and spread in characteristics can be at least partially compensated.

Abstract: When a plurality of shunt motors connected in parallel are used for driving an electric railcar, the differences in the characteristics of the motors introduced during the manufacturing thereof causes the armature currents to vary greatly even when they are running at the same speed. To control the field current by means a single device, therefore, the armature currents must be corrected by armature choppers. In order to fully recover the kinetic energy possessed by the electric railcar, the present invention automatically corrects for the difference in the characteristics of the shunt motors so that the required braking force is uniformly borne by each of the shunt motors.

Abstract: A reverberation apparatus includes a signal input terminal to be supplied with an input signal, an operational amplifier having an inverted input terminal, a non-inverted input terminal, and an output terminal. The inverted input terminal is connected to the signal input terminal through an input impedance circuit. The non-inverted input terminal is connected to a reference point, and the output terminal is connected to the reference point through an inductance circuit as a load and a first impedance circuit. A second impedance circuit is connected between the inverted input terminal of the operational amplifier and the connection point between the inductance circuit and the first impedance circuit. In this circuit, the inductance circuit functions as a drive circuit of the reverberation apparatus.

Abstract: An elevator speed instruction generating system using an electronic computer to generate speed instruction data comprises a pulse generator adapted to generate a pulse whenever the cage runs a predetermined distance, a counter for subjecting the pulse thus generated to addition and subtraction according to the travelling direction of the cage, and memory means provided in the electronic computer for storing acceleration and deceleration instruction data. Acceleration instruction data are read out of the memory means every predetermined time in the acceleration operation, and in the deceleration operation deceleration instruction data corresponding to the differences between the absolute position of a destination floor and outputs of the counter are read. Adjustment of the elevator, which is required when it is installed in different buildings, can be achieved merely by changing the data stored in the memory means.

Abstract: Apparatus is disclosed for controlling the duty ratio of the application of an energization source such as a battery to a load in the form of a motor for driving a vehicle. More particularly, there is disclosed a motor control implemented by solid state devices and more specifically, SCR elements. The apparatus employs a first oscillator circuit for providing a first train of timing pulses, the frequency of which is determined by the position of an operator manipulatable member, e.g. a vehicle accelerator pedal. The first train of pulses is applied to fire a main SCR. Further, there is provided a second oscillator circuit for providing a second train of pulses for controlling the discharging or dumping of the charge stored upon a commutating capacitor across the main SCR, thereby deactuating or commutating the main SCR.

Abstract: A ring-trip detector circuit is disclosed which detects a subscriber off-hook condition in the presence of a ringing signal. The ring-trip detector employs substantially all low-voltage components which enables it to be fabricated using integrated circuit techniques with the resultant cost and space-saving advantages inherent therein. The ringing signal is disabled upon detection of a DC component which is present in the telephone loop only when the subscriber goes off-hook. This circuit detects the DC voltage component across a resistor (20) in series with the ringing source (19) and the telephone loop (12, 13). The voltage across this resistor (20) is converted by resistance networks (23, 24) into two relatively small currents that are fed to low impedance points (25, 26). A difference current is formed therebetween, which is filtered (31, 45) to remove AC components, and compared with a threshold current (29, 46). Ring-trip occurs when the filtered difference current exceeds the threshold.

Abstract: The invention is a combination induction generator/synchronous generator power system which finds particular use in aircraft environments. The power system includes an induction generator (36) and a tandem generator (38) enclosed in a single housing (34). The tandem generator (38) includes a tandem synchronous generator (46) which optionally excites the induction generator (36) or provides power to the aircraft systems upon activation of the three-phase contactor (48). The tandem generator (38) also includes a tandem synchronous generator (44) which produces, via a phase controlled rectifier bridge (42), 270 VDC power for the aircraft systems.

Abstract: A fast rotating ferrite ring engine that is started by an external starting motor generates a medium mechanical power continuously. The rotating ferrite ring engine body is composed of thin circular ferrite rings affixed to a nonmagnetic plate connected to external devices necessary for the inventive operations, a heat portion, a magnetic field generator both of which are located in the same place where the rings are passing through, and a cooling portion through which the ferrite rings also are passing and restoring cyclically the heated portion of the rings to the cool state that is magnetizable.After starting by an external starter motor, the ferrite ring engine is controlled at a constant peripheral velocity V.sub.O by the countertorque of an externally connected electric power generator.In this state, the magnetic energy which enters into the heat portion is made to V.sub.O .multidot.HB.sub.S .multidot.S.multidot.(1/8.pi.).multidot.10.sup.

Abstract: A method and apparatus for controlling a stepper motor involves the generation of command currents which drive the stepper motor and provided critical damping of the natural resonance of the stepper motor. Digital error signals are developed by selectively combining a position signal and a digital velocity signal which is derived from a feedback signal proportional to velocity. In one embodiment, the digital error signals are converted into command currents for driving the stepper motor in such a manner as to achieve damping of the motor's natural resonance. In an anternative embodiment, the digital error signals and feed forward acceleration signals and/or feed forward velocity signals are converted into command currents for driving the stepper motor so as to achieve damping of the motor's natural resonance, as well as correction for positional errors induced by either velocity or acceleration.

Abstract: The method comprises measuring the voltage induced during the driving pulse in the coil by rotation of the rotor, and interrupting the drive pulse in dependence on the measurement made.The device for carrying out this method comprises a circuit for measuring the induced voltage, a circuit for comparison with a reference value and a circuit for calculating the duration of the drive pulse.

Abstract: A control circuit for an antenna rotator includes a difference amplifier which develops a motor drive signal of both positive and negative polarity for rotation of a DC motor in both clockwise and counterclockwise directions. A feedback loop circuit for control of the motor is provided by a sensor of antenna position, the sensor being coupled between the antenna and the amplifier. Friction in a gear train coupling the motor to the antenna isolates the circuit from wind induced vibrations of the antenna.

Abstract: An optimum acceleration deceleration circuit for stepper motors wherein an error signal is fed to a rate limiter circuit which generates a speed output voltage. The speed output voltage is fed back to the rate limiter circuit through a non-linear gain amplifier and summing amps.

Abstract: The subject-matter of the present invention is a system for the generation of electrical energy by utilizing the kinetic energy of seawater, comprising a floating body exhibiting two floating supports (1) connected by a lower platform (2), a main deck and a large impeller (5) arranged between them and having a horizontal axis (12). The impeller axis is carried by vertical platelike supports (4) which divide the impeller vanes into several sectors. The rotary movement of the impeller is transmitted to a machine park (19-22) located on the main deck (3) for the generation of electrical energy. Despite its large dimensions the system according to the invention is distinguished by its high stability (FIG. 7).

Abstract: A control circuit and auxiliary power supply and a switching means for connecting the load selectively to the auxiliary power supply and the main power supply.The main power supply may be a public utility power line, and the auxiliary power supply is a windmill, a motor and generator all connected together on a common shaft. A control means senses the output voltage of the generator or output frequency and controls the switch to either connect the load to the power line or the auxiliary power supply.A battery is supplied for storing excess windmill power and for driving the motor and generator during periods of low wind.

Abstract: A motor control circuit utilizes sample and hold circuitry whose operation is initiated by an analog switch to control the firing angle of silicon control rectifiers, thereby to minimize wasting of power supplied to the motor being controlled.

Abstract: A sidetone circuit (44) is connected to the terminals of a two-line telephone system. The sidetone circuit (44) receives inputs from a DTMF source (62) and a microphone (72). These inputs are selectively passed through a circuit (82) to produce a modulating signal which controls a current source (46) and a current (54). The current source (46) is connected between the telephone line terminals. The input audio signal from the microphone (72) modulates the current source (46) to impress a voltage upon the telephone line. The current source (54) is connected between a first of the telephone lines and a balance node (60). A resistor (58) is connected between the balance node and the second of the telephone lines. An incoming audio signal over the telephone line is coupled to the balance node (60) for summing with an inverted audio signal. The input audio signal from the microphone (72) is further coupled to the balance node (60).

Abstract: An improved electromagnetic relay having a wafer of material with positive temperature coefficient of resistivity (PTC) mounted inside the relay combines a sturdy construction with low manufacturing costs adapting the relay for use as a starting relay for electric motors of compressors. For this purpose, the magnetic members of the relay are incorporated in the electrical relay circuit and are provided with attachments for plug-on connections of the relay to circuit pins of motor-compressor units.