Abstract: The invention relates to a starter-generator machine (10) for starting turbine type aircraft engines. The machine combines an induction motor with a synchronous samarium cobalt generator. In the machine, a rotor-shaped stator (22) is fixed and positioned inside a squirrel-cage induction rotor (18) which has an array of samarium-cobalt magnets (24) attached on the outer diameter thereof. The compound dual machine operates as a starter by using the induction rotor to accelerate the permanent magnet rotor, and thus the aircraft engine via a drive pinion (34), up to some low synchronous speed, when ac power is applied to the outside stator (16) to lock in the permanent-magnet rotor (24) synchronously with the rotating field created in the stator (16) of the synchronous generator. As the speed of the rotor (24) is then increased, the engine speed is also increased via the drive pinion (34).In a second embodiment, a cartridge type induction-motor (70) is utilized to initially start an aircraft engine.

Abstract: There is provided a termination assembly for a cable shield which is particularly useful in connecting the shield to ground. The termination includes a tubular rivet for compressing a serrated ring into the shield for making electrical and mechanical termination. A resilient Belleville washer is compressed by the rivet for maintaining the termination.

Abstract: The invention relates to a power generation system comprising a Brayton cycle turbine for directly driving a first air compressor. A motor/generator is adapted to drive said turbine in the power generating condition and be driven by said turbine in the start condition. A second air compressor is also directly driven by said turbine and is coupled to said turbine, motor/generator, and said first air compressor by a gear system. A heat exchanger between said second air compressor and said turbine provides heat energy to drive the system.

Abstract: An apparatus for controlling an elevator, which comprises a managing first electronic computer for managing the service of the start and stop of an elevator cage and a controlling second electronic computer for controlling the speed of the cage in accordance with a command from said first computer, wherein when the managing first computer becomes defective, the cage is conveyed to the nearest floor by the controlling second computer and when the second computer becomes defective, the cage is conveyed at a low speed to the nearest floor by the first computer and a manual operating circuit. Therefore, regardless of which of the first and/or second computers become defective, the cage can be automatically operated to the nearest floor and the passengers in the cage can be rescued.

Abstract: A vehicle anti-skid braking system, particularly for articulated vehicles, in which a fail-safe device is incorporated to disable the braking-releasing function if a skid signal is generated during the initial period of operation of the braking system before the brakes have been effectively applied.

Abstract: In a motor in which the currents to the exciting coils are controlled by the signals from the Hall elements (H1, H2) which detect the pole positions of a permanent magnet (Mg), the Hall elements are positioned at an electrical angle of 45.degree. with respect to the exciting coils (22, L1, L2, L3, L4), and the output signals of said Hall elements are converted into pulses for conducting digital control of the currents to the exciting coils.

Abstract: An image density detecting device for an image forming apparatus includes a substantially rectangular diffusing member for receiving light from document through a focusing light-transmission member and a plurality of photodiodes embedded at a suitable interval in the bottom of the light diffusing member. The longitudinal dimension of the light receiving surface mentioned above has a longitudinal dimension equal to the width of a document set on a table and a transversal dimension corresponding to an area of the document surface illuminated by an exposure lamp. Light reflected from the document illuminated by the exposure lamp is uniformalized through the light diffusing member before it is detected by the photodiodes.

Abstract: A field coil insulation shield for a motor or generator is made of a single sheet of insulating material, and defines portions which substitute for the paper insulator conventionally disposed around a field pole and between a field coil and a motor frame, and portions which substitute for individual wrappings with tape to form the field coil and to protect it from the structure of the field pole which holds it in position. The portions which substitute for a wrapping of tape are provided with elongated projections which are latchingly received around the edge of a central aperture, through which the field pole passes.

Abstract: A control circuit for a DC inverter for an induction motor comprises:circuitry to produce a control waveform characterized by a sequence of pulse groups wherein the durations of the pulse groups increase with time, and wherein the widths of the pulses within each group increase with time, the circuitry supplying the waveform to the inverter.The circuits typically includes:(i) a first oscillator having a sawtooth output,(ii) a ramp generator having a voltage output which changes with time,(iii) a first comparator operatively connected with and responsive to the first oscillator and ramp generator outputs to produce an output characterized by a duty cycle which increases with time, and(iv) a second oscillator responsive to the comparator output to produce an output having a frequency which increases with time.

Abstract: A switching circuit for producing a current drive for a bipolar brushless motor in solid-state form comprising cross-linked switching transistors which are controlled by control transistors which in turn are controlled by a decoder. The decoder may have provided as input signals either signals derived from the rotation in the motor in which case it acts as an asynchronous motor or may be controlled by signals from a counter which receives input pulses in which case the motor will rotate to accordance with the input pulses.

Abstract: This invention is designed to prevent the large charging current from flowing to the capacitor at the start of the elevator for preventing damage of the elements of the rectifier device. Thus the present device provides a control device for an a.c. elevator which includes:a commercial a.c. source,a capacitor for smoothing the output voltage of the commercial a.c. source,an inverter for converting the smoothed output voltage of the capacitor into an a.c. power of the variable frequency,an a.c. motor for driving the elevator car by the a.c. power supplied from said inverter, anda rectifier for rectifying the voltage of the commercial a.c. source and charging said capacitor by the thus rectified voltage at least when the car is stopped.

Abstract: An anti-log power amplifier for energizing a reversible electric motor of an electrically assisted power steering system for an automotive vehicle. The power amplifier has a preamplifier which amplifies the output signal of a torque sensor detecting the torque applied to the vehicle's steering wheel, an anti-log signal generator exponentially modifying the amplified output signal, a pulse width modulator converting the exponentially modified signal to a pair of complementary pulse width signals, and a pair of bridged power amplifiers for energizing the reversible electric motor in response to the complementary pulse width signal. The bridged power amplifiers are further responsive to the exponentially modified signal for increasing the electrical power delivered to the reversible electric motor under high torque loads.

Abstract: The motor comprises a stator with three pole pieces having pole faces which define a cylindrical space, two windings which are magnetically coupled to the first and the second pole piece, and to the first and the third pole piece respectively, a rotor which is concentric with respect to the cylindrical space and which comprises a first permanent magnet, and a second permanent magnet coupled with the first magnet for holding the rotor, in the absence of any other influence, in a position in which the magnetic axis of the first magnet coincides with a rest axis. The field produced in the cylindrical space by the flow of a current in any one of the windings is at an obtuse angle to the rest axis.The rotor performs 360.degree. steps in response to pairs of current pulses, the first of which is applied to one of the windings and the second is applied to the other of the windings.

Abstract: A passenger vehicle door obstruction sensing control apparatus includes a first time period that begins when a door close command signal is received and the vehicle doors start to close. This first time period permits the door drive motor to reach a steady-state speed of operation. Then a motor speed responsive signal is provided to a speed reduction sensing apparatus for opening the doors for a second time period whenever the motor speed reduces below a predetermined limit.

Abstract: A speed pattern generator, and method of generating a speed pattern, for use by an elevator car during a run to a target floor. The speed pattern includes a time based portion and a distance-to-go based portion. Calculations during the time based portion are minimized by calculating spaced points or decision speeds on the acceleration portion of the desired speed pattern. The points selected are those points at which decisions must be made as to whether the acceleration portion of the pattern should be continued. The pattern is changed at a predetermined jerk limited rate between the decision points, until a decision is made which indicates acceleration should be reduced to zero, either because the maximum desired magnitude of the speed pattern is being approached, or because the advanced floor position (AVP floor) of the elevator car has reached the target floor.

Abstract: A circuit (30) for regulating the current level in a pulse width modulated stepper motor drive (10), the circuit (30) comprising a clock (26) for providing a signal output at a preset and predetermined frequency and duty cycle. A power supply (Vs) supplies current for energizing the windings (A-D) of a stepping motor, the circuit (30) chopping the current and controlling the chop duty cycle to maintain a predetermined current in stepping motor windings (A-D), the chop frequency being directly related to said clock frequency. The circuit (30) senses the current flowing through the windings (A-D) of the motor, and compares, in a differential amplifier (32), the sensed current to a predetermined current level (Vref).

Abstract: In a power control for a turbo-generator, the acceleration power of the difference between the mechanical power supplied to the turbo-generator set and the power delivered by it is determined and, if the supplied power preponderates, a correction signal directed toward closing control valves is fed to the power control by means of a valve positioning controller, Thereby, the power control need not be disconnected in the event of disturbances such as load shedding and network short circuit, but can practically remain engaged continuously.

Abstract: A current transformer having at least one ring-shaped core with a secondary winding mounted thereon, and a primary conductor, located within its casing. An inner tube is provided between the ring-shaped core and the primary conductor, one end of the tube being electrically connected to the casing and its other parts electrically insulated therefrom. A cylindrical, electrically conductive screening shield at least partially overlaps the inner tube and is electrically connected to the casing on the side of the ring-shaped core which is distal from the electrical connection between the casing and the inner tube, while the other parts of the shield are electrically insulated from the casing. This overlap forms a short-circuit loop for any steep progressing wave which is generated when switching on a potential-free part of the circuitry, or when due to an interruption, a small capacitive current breaks off.

Abstract: Herein disclosed is a battery-operated, dot type recording apparatus which comprises a drive mechanism unit having its number of revolutions regulated by the output of a quartz oscillator, a circuit for connecting a d.c. power source with a meter only when a measured value is to be recorded, and delay switching means for causing the tip of a pointer of a meter to hit the recording paper at the time when that meter becomes stable. Thus, the dot type recording apparatus is so constructed of a small number of mechanical means that it can reliably operate for a long time, while having its adjustment and maintenance facilitated, with little influence from changes in circumstances.

Abstract: The invention pertains to a control circuit (10) for controlling the speed of a pair of motors (12,14), including a pair of switching elements (68,74) coupling power to the motors (12,14), a pair of controllable circuits (64,74) for driving the switching elements (68, 74), a circuit (36) for generating digital numbers representing the same command speed for each of the motors (12,14), a circuit (38) for generating digital numbers representing differential command speeds for the motors (12,14), and a data processor (56) for controlling the pair of controllable circuits (64,74) in response to the digital numbers. By utilizing digital and integrated circuit technology, prior, essentially linear, control apparatus, which are relatively unreliable, expensive and slow, need not be used.