摘要:
An electric motor operated by AC current, that includes a stator and a rotor supported for rotation about an axis relative to the stator. The stator is provided with field windings angularly distributed about the rotor axis and capable of producing a magnetic field vector in the space of the rotor. Circuitry delivers AC current to the windings in a manner that produces an AC magnetic field vector that moves around the axis of the rotor. The rotor has a construction, such as an axially extending conductive loop, that changes its reluctance in the AC magnetic field depending on its orientation to the AC magnetic field vector whereby the rotor is caused to rotate in synchronization with the movement of the AC magnetic field vector.
摘要:
An ECG system is disclosed having amplification circuitry which, while effectively blocking electrical transients resulting from undesirable low frequency electrical artifacts, nevertheless maximizes the continuity of receipt of desirable heart activity indicating information. The ECG system employs a DC coupled amplifier including an integrating circuit for effectively reducing the DC gain of the amplifier to substantially zero and for providing a pass band gain of about 1,000 at frequencies above about 0.05 Hz. A fast acting saturation sensing circuit is also incorporated. The saturation sensing circuit resets the integrating circuit to offset any artifact produced signal and to thereby minimize loss of the desired ECG hear activity indicating information.
摘要:
A linear solid state servo amplifier operated from a low voltage source and which develops a voltage across the servo motor equal to the source voltage diminished only by the saturation voltages of two of its output transistors has a bridge output stage of complementary transistors and a bridge driver stage of complementary Darlington transistors having as its load a preselected resistor.
摘要:
A solenoid operable from an alternating voltage source is disclosed and the solenoid may actuate a fluid valve with the fluid of the valve wetting the movable armature inside a barrel. The barrel is sealed against fluid leakage at all places except the axial end connected to the valve. A frame is coaxial with the barrel and encloses an electrical coil. A magnetically permeable core is inside the barrel and fixed relative to the frame and this core carries a first pole piece. A second pole piece is on the movable armature for cooperation with the first pole piece. The electrical coil is energized with rectified voltage from the alternating voltage source and this together with the shape of the pole pieces establishes a controlledsaturation of these pole pieces in a range of positions of the armature. This saturation of the pole pieces is established so that the saturation decreases as the armature moves from a first extended position toward a second closed position. This changeable saturation of the pole pieces permits the stroke versus force curve of the solenoid to be improved in comparison to the prior art.
摘要:
A high torque AC motor of the repulsion type that includes at least four stator poles and an armature with chordally oriented windings. The armature windings are cyclically shorted and opened in groups at appropriate angular positions of the armature by a non-contact switch circuit carried on the armature.
摘要:
A brushless repulsion motor in which the rotor carries electronic switch circuits for selectively shorting the rotor windings at appropriate times in its rotational cycle. A non-contact reference signal source on the stator enables the electronic circuitry to operate as desired. The disclosed motor arrangements are useful as substitutes for conventional brush-type repulsion motors, universal series motors, synchronous motors, servomotors and stepping motors.
摘要:
A constant speed hydrostatic drive system is disclosed wherein a generator drive shaft is maintained at a constant speed by utilizing an electro-hydraulic controlled displacement pump responsive to a pressure transducer to control a hydraulic motor. A speed sensor is used to produce a direct current signal responsive to the drive shaft speed. The signal is converted into a series of voltage pulses also responsive to the shaft speed which are compared to a speed reference signal to provide a speed error signal. A loop gain control means is provided to utilize said speed error signal to adjust the shaft speed to coincide with said reference signal. A timing reference and digital trim control are also provided to compensate for long term drifting in the type speed control circuit described above.
摘要:
A method and an apparatus are described for constructing a compact inductive-capacitive circuit, using a spiral inductor of more than one turn, plus a capacitive plate. This method includes duplicating the layout of the spiral, and then offsetting the duplicate so that the trace pattern of the spiral overlaps its duplicate at an insulating distance away, with the duplicate as an underlying capacitive plate. The plate's trace pattern includes at least one gap, plus an extension of its trace to span the region under the terminals of the spiral inductor. For the case where the spiral inductor has more than one turn—plus an underpass—the capacitive plate may also have more than one turn and may also have an underpass. The resulting pair of underpasses may be either overlapping or nonoverlapping. If overlapping, the full circuit requires at least four metal layers, and at least three if the underpasses are nonoverlapping.
摘要:
An electric motor operated by AC current, that includes a stator and a rotor supported for rotation about an axis relative to the stator. The stator is provided with field windings angularly distributed about the rotor axis and capable of producing a magnetic field vector in the space of the rotor. Circuitry delivers AC current to the windings in a manner that produces an AC magnetic field vector that moves around the axis of the rotor. The rotor has a construction, such as an axially extending conductive loop, that changes its reluctance in the AC magnetic field depending on its orientation to the AC magnetic field vector whereby the rotor is caused to rotate in synchronization with the movement of the AC magnetic field vector.
摘要:
Brushless dynamoelectric machines utilizing conventional DC armature construction. The winding of the armature is modified by providing a set of three leads to its coil ring circuit at points spaced angularly about 120.degree.. Electrical energy is carried in these leads instead of a commutator and brush set. In most versions of the machine, a shell rotates about the armature, while the armature is caused to remain stationary. The three lead lines are brought out parallel to the axis of rotation through a bearing supporting the shell.