Abstract: A starter apparatus comprises a D.C. motor, a solenoid actuator, a hollow sleeve having at one end thereof a pinion and a one way clutch. A torque of an armature of the D.C. motor is transmitted through the one way clutch to the hollow sleeve and further transmitted to a ring gear of an engine, which is engaged with a pinion of the hollow sleeve, thereby performing a start up of the engine. The engagement or disengagement between the pinion and the ring gear is carried out by means that the solenoid actuator reciprocates only the hollow sleeve through a shift lever.

Abstract: The invention is an "electric" constant speed/variable speed drive/generator assembly (10), which finds use in aircraft, and in particular, in "all-electric" aircraft. The assembly (10) includes a planetary differential (20) whose output is controlled by a "make-up" induction motor (12). The induction motor (12) includes a squirrel-cage rotor (14) which is rotatable about a rotor-shaped stator (16). The assembly also includes a primary power generator (30) which includes a permanent magnet rotor (18) and an output winding (22). The rotor (18) is co-axial with and rotatable about, the outside of the rotor (14). The outer rotor (18) is driven by the planetary differential (20) in such a manner that the planet-carrier (24) is driven by the aircraft's engine, the ring-gear (26) drives the generator (30), and the sun-gear (32) is connected to the induction motor (12).

Abstract: A first capacitor is discharged with every pulse of a train of pulses of a frequency proportional to the actual speed of a rotary machine under control and is charged up during intervals between these pulses. The voltage of the first capacitor provides a signal to a threshold circuit which operates to provide a second signal whenever the voltage of the first capacitor exceeds a predetermined voltage which may be set in order to set the speed at which the machine is to be controlled. During the presence of the second signal a second capacitor is charged, beginning at a predetermined voltage, preferably zero. The regulating magnitude for the machine to be controlled is derived from the voltage of the second capacitor either directly or indirectly through a controller circuit and a power stage. The circuit is particularly useful for control of the speed of machines that run slowly or can conveniently provide only relatively few speed-indicating pulses per revolution.

Abstract: A stepping motor driving circuit includes a plurality of switching transistors having their emitter-collector paths connected to the corresponding ends of motor coils, a plurality of diodes having their anodes connected to the above-mentioned ends of the motor coils and their cathodes connected to a common terminal, and a braking circuit connected between the cathode of the diodes and the other end of the motor coils, in which the switching transistors are sequentially turned ON to permit excitation currents to pass through the corresponding motor coils. The braking circuit has a variable effective impedance.

Abstract: Energy is stored in a hoop 12 spinning around a stator 10 both made of soft steel. At the interface between them there is a cavity in which there are conductors to provide a magnetic bearing between the hoop and the stator. A magnetic levitation device keep the hoop levitated. Energy is imparted to and withdrawn from the hoop by means of linear reluctance motors.

Abstract: A synchronous wheel-slip control system for a multi-axle vehicle having a speed sensor for producing signals representative of the velocity of each of the wheel axle units. A differentiator connected to each of the speed sensors for differentiating the velocity signals to obtain rate signals. A plurality of truck and car rate comparators for determining when all the wheel axle units are in synchronism. A plurality of truck and car highest velocity circuits for determining the actual highest velocity signal of the wheel axle units and a car differentiator for differentiating the actual highest velocity signal to obtain the actual highest rate signal. A synchronous slip logic network for causing a data processing circuit to initiate a brake force reduction action of one of the trucks when all the wheel axle units are in synchronism and when the actual highest rate signal exceeds a requested rate.

Abstract: An elevator system having an elevator car, a running speed pattern generator, and a landing speed pattern generator. The landing speed pattern generator includes a plurality of different landing patterns stored in memory. When the elevator car enters the landing zone of the target floor, the magnitude of the running speed pattern is detected and a landing speed pattern is selected in response to this magnitude. The selected landing speed pattern is substituted for the running speed pattern, to enable the elevator car to land smoothly and accurately at floor level, notwithstanding errors in the running speed pattern.

Abstract: A vacuum pump is attached to a front side of an alternator, that is, between a driven pulley and the alternator, wherein a pump shaft is detachably coupled to an alternator shaft through a tubular bushing shaft. A seal member is disposed in the tubular bushing shaft for preventing leakage of lubricating oil from the pump to brushes arranged at a rear side of the alternator.

Abstract: A method for operating a frequency converter of the type having an auxiliary commutating device for commutation at speeds which are lower than a machine-related minimum speed of operation. In a first speed range which begins at speed zero, the thyristors of a three-phase bridge of the inverter are commutated cyclically, as customary, six times per revolution of the machine. In a second speed range which is adjacent to the first speed range and below the machine-related minimum speed of operation, only every second commutation is executed. In embodiments of the invention wherein there is provided a third speed range which is adjacent to the second speed range and extending up to the machine-related minimum speed, only every third commutation is executed. In this manner, an auxiliary commutating device having a predetermined frequency limit can be utilized at speeds corresponding to two or three times the speed at which such an auxiliary commutating device could be used in prior art systems.

Abstract: A machine for generating electrical power having a mechanical oscillator arranged to drive the armature of a linear generator. The oscillator, in turn, is driven by an independent prime mover.

Abstract: A control circuit for a DC capstan motor used for driving a tape having control signals thereon is adapted for accurate stopping of the tape during intermittent-motion operation. A frequency generator coupled to the motor generates a frequency signal whose frequency is proportional to the motor's speed. A position signal generating circuit generates a position value that increments by steps upon occurrences of the frequency signal. A clamp circuit clamps the position value to a clamping level upon detection of the control signals. A brake start signal generator provides a brake start pulse signal when the position value exceeds a predetermined threshold, and this brake start pulse signal is used to commence braking of the motor. In order to permit accurate stopping in both forward and reverse directions, the clamping circuit provides one clamping level when a forward mode is selected and another clamping level when a reverse mode is selected.

Abstract: Described is an emergency drive device for an A.C. elevator which comprises; and alternating current motor for driving a car, an inverter for converting a direct current into an alternating current of variable frequency and supplying the resulting alternating current to said alternating current motor, and an emergency power source connected across input terminals of the inverter with the same polarity as said input terminals and designed to supply direct current power to the drive device.

Abstract: A method and apparatus for sensing the current position of a movable element in a position control system which includes first and second control devices each having a command pulse generating means and error storage means for computing and storing an error between a number of command pulses and a number of feedback pulses indicative of an amount of motor movement. The position control system also includes a speed control circuit for driving and controlling the motor on the basis of the error in the storage means, and a switching circuit for selectively connecting the first and second control devices to the speed control circuit, the current position of the movable element being sensed by one control device when the other control device is connected to the speed control circuit.

Abstract: To provide for close adaptation of braking performance by braking pressure maintenance, braking pressure dropping, or braking pressure increase to match wheel acceleration or deceleration, and operating constants within the overall braking system, the wheel anti brake-lock responds when wheel deceleration drops below a predetermined reference threshold. Wheel speed is sensed in steps, for example in intervals of 0.25 km/h, and the steps are counted. A predetermined brake pressure decrease time (t.sub.min) is initiated when wheel speed drops below the reference wheel speed, the total time (t.sub.a) of pressure decrease being the minimum time plus a number of first control time intervals (.DELTA..sub.1t) which depend on the number of speed steps being passed by the wheel as it decelerates. If the wheel speed, after the pressure decrease, does not decelerate at the same rate anymore, a pressure maintenance phase is commanded for a maximum time (.DELTA..sub.

Abstract: A system for controlling the propulsion on motor vehicles which not only enables the output torque of the drive unit of the vehicle to be utilized in an optimum manner in critical driving situations, especially under extreme road conditions, but also endows the vehicle with good stability and enhanced driving safety. A comparator is provided, in a propulsion control system which is triggered by at least one presettable or permanently preset threshold value of the speed of the vehicle, and generating an output signal causing the drive torque to be reduced, as soon as this threshold value is exceeded and a signal is present, which indicates that an individual wheel brake is being activated and/or that one of the driven wheels is tending to spin. The threshold value of the speed of the vehicle, which value governs the control process, is preferably regulated in accordance with the transverse acceleration which acts on the vehicle whenever it follows a curved path.

Abstract: A method and an apparatus for controlling and regulating an electrical motor, especially a reactive motor for time-keeping devices such as clocks. The motor has a permanent-magnetic rotor with at least two poles, and a stator with at least two coils. In a normal speed mode one of coils is supplied with driving pulses whereas the second coil senses the rotational speed of the rotor. If the rotational speed of the rotor falls below a predetermined value, a self-starting mode is initiated wherein the first and second coils are alternately supplied with driving pulses. In this self-starting mode the frequency of the pulses supplied to the first and second coils is increased until normal speed has been reached wherein the self-starting mode is switched off and the normal speed mode regulation is switched on.

Abstract: There is disclosed a control system for stopping a punch press and comprising first and second proximity sensor-amplifier combinations responsive to the cyclical movements of respective parts of the press to generate respective cyclical signals having respective recurrent digital waveforms which remain invariable while the press and such combinations operate normally. A device responds to a misfeed in the stock strip to change the waveform of the first signal. The two signals are fed to logic circuits which respond either to a change in waveform indicative of such fault or to a change in waveform indicative of malfunction of either combination to produce a signal for stopping the machine.

Abstract: A brushless motor comprising seven or more armature windings mounted on a stator, a field magnet mounted on a rotating shaft to rotate therewith with respect to the armature windings, a plurality of semiconductor commutating devices, each being connected to one of the armature windings, and Hall sensors for detecting the polarity of magnetic fields immediately opposite the windings. Each commutating device controls the direction of the electric current to be fed to its respective armature winding, according to the magnetic polarity detected by the Hall sensors. The armature windings are connected together at one end thereof and are connected to respective commutating devices at the other ends thereof.

Abstract: A regulator system for both the Diesel and the electric portions of a Diesel electric locomotive allowing more reliable operation at all locomotive speeds. Said regulator has a regulator to regulate the electric power by varying the excitation (43) of the main generator by means of orders coming from a driver control (1, 8) which set a reference current level and (17) a voltage reference level (19) for the main generator and a Diesel engine gas oil reference level (18). These levels are compared with measurements of true corresponding values (24, 30, 27) and orders (43) for increasing or decreasing excitation are delivered so that the excitation of the main generator remains inside the scope delimited by the various reference levels and a Diesel power regulator which sends out orders to increase or decrease the gas oil injection in accordance with a predetermined Diesel engine speed/injection law and in comparison with the true measurements of the injection and of the Diesel engine speed.

Abstract: A control circuit is used during slow or stop-motion playback operation of a video tape device to drive video tape intermittently. In order to avoid errors in the stopping position of the tape, a pulse width modulated (PWM) signal is provided to a motor controller circuit associated with the capstan motor of the video tape device. A frequency signal generator coupled to this motor generates a frequency signal that varies with the capstan motor speed, and this frequency signal is provided to a retrigger monostable multivibrator which generates a PWM signal whose duty ratio changes in proportion to the capstan motor speed. A drive pulse generator and a brake pulse generator provide drive start and brake start signals, respectively, when it is desired to commence and stop movement of the tape.