Abstract: An inertial linear actuator for stabilizing a platform against vibration includes a movable coil having windings which may be energized, supported on an actuator guide for movement. The actuator guide is fixed to the platform and a current is supplied to the movable coil to generate a force for damping sensed vibrations on the platform surface. Permanent magnets parallel to the actuator guide, and a current in the movable coil results in a force being introduced between the movable coil and the stationary actuator guides. A control system on the platform supplies a feedback signal from an accelerometer coupled to the platform to drive electronics. The drive electronics produce a current having the magnitude and direction for creating the actuator force for damping the sensed disturbance.

Abstract: An apparatus for correcting imbalance of a rotor suspended by a magnetic bearing system including a displacement sensor for detecting a displacement of the rotor. An imbalance correcting circuit applies a trial imbalance correcting signal to the magnetic bearing system. A command computer applies an amount of correction to the imbalance correcting circuit and calculates an influence factor of the imbalance correcting signal on the basis of outputs from the displacement sensor before and after the imbalance correcting signal is applied to the magnetic bearing system, so as to cause the imbalance correcting circuit to apply a predetermined imbalance correcting signal produced from the influence factor to the magnetic bearing system, thereby minimizing the output of the displacement sensor to correct mass-imbalance of the rotor.

Abstract: A noncontact magnetic bearing has cylindrical magnetic members magnetized axially, slightly different in radius and different in length, disposed in opposite relation to each other, with their magnetic poles of reverse polarities displaced vertically relative to each other. Either the inner cylindrical magnetic member or the outer cylindrical magnetic member can be used as a shaft, and consequently, the other is fixed to a support member. The inner cylindrical magnetic member and the other cylindrical magnetic member are held at a stable and mutual-noncontact state to provide a noncontact magnetic bearing that is stable axially, as well as radially.

Abstract: The motor includes a rotor (2) with permanent magnets and a stator (3) that surrounds the rotor and includes reluctance pads (9, 10) provided to place the rotor (2), upon stopping, in a position where the startup of the motor will be assured. The reluctance pads (9, 10) are asymmetrical with respect to the magnetic axis (A) of the coils of the stator (3) and include notches (4), at least some of which serve to accommodate at least one coil of the stator (3), in order to assure obtaining a maximum winding coefficient.

Abstract: An encoder motor comprising: an encoder incorporated in the encoder motor, for carrying out positional detection and having an encoder code wheel fitted to a motor rotary shaft of the encoder motor; a coil formed as a moving coil movable together with the motor rotary shaft; a magnet operative with respect to the moving coil; and a bobbin in the form of cylinder on which the moving coil is disposed. The bobbin is arranged concentrically with respect to the motor rotary shaft and directly fixed to the code wheel of the encoder.

Abstract: A variable speed controlled induction motor has a rotor (8) formed in one piece and a plurality of stators (24,25), the rotor having a plurality of rotor cores (2,3) and a plurality of conductive members (5) interconnected and the stators having respective stator windings (22,23). The stator windings (22,23) are connected in series, the rotor conductive members (5) are short-circuited by connecting members (r) at an air space or a non-magnetic core portion disposed between the rotor cores (2,3), and at least one of the plurality of stators (24,25) is associated with a phase shifter (38;47;50;51) providing the voltage of a given phase to the stator windings, whereby the rotational speed can be controlled easily over a wide range with excellent torque characteristics and efficiency.

Abstract: A magnet coupling, in which a ceramic isolating plate 5 is provided between a driven magnet 4 and a drive-side magnet 3 and ceramic bearing members 13, 14 are placed between the respective sides of the isolating plate 5 and the driven magnet 4 and the drive-side magnet 3, whereby the gap between the drive-side and load-side is minimized.

Abstract: In an electrostatic precipitator system powered by a primary power source, the power supply has a converter and a high voltage device. The converter can be coupled to the primary power source for producing a converter voltage with a different frequency content. The high voltage device is driven by the converter, producing from its converted voltage a high voltage. This high voltage is influenced by the different frequency content, having at least one frequency component at a predetermined low frequency which is sized to promote efficient precipitation.

Abstract: To provide an actual speed output signal upon operation of a permanent magnet motor having a generally trapozoidal or rectangular magnetic flux distribution, and the armature includes a plurality of pulse-energized strands, a sensor winding is placed on the armature and so located that it will pick up a harmonic of flux induced in a conductor to be cut by the rotating flux due to the rotor so that the output speed signal will be a multiple and thus readily analyzable with respect to actual speed in electronic circuitry. The sensor winding extends, preferably, in the same armature slots, or adjacent the armature windings, to be cut by all the flux derived by the rotor so that special winding locations on the armature can be avoided and the sensor winding placed on the armature in conventional positions thereof.

Abstract: A force or fluid pressure transducer comprises two plate-like crystals. The force is applied to the first of the two crystals in a direction generally along the crystal faces by two seatings situated at opposing edges of the crystal.An oscillating portion of this first crystal changes its frequency by an amount which is a very accurate measure of the force, providing the ambient temperature of the instrument remains constant.The present invention resides in a second crystal secured to the first crystal at particular force insensitive points, there being very small spacing between the two crystals. The second crystal sustains a negligibly small amount of the force and hence a similar oscillating portion of this second crystal undergoes negligibly small frequency change.Means are provided for adjusting the steady-state temperature behavior of one crystal with respect to that of the other in order to remove residual errors.

Abstract: An apparatus which reduces magnetic cogging between a rotor and stator of an electrical motor or generator. The stator is divided into pairs of angular pie-shaped segments, one member of each pair being shifted angularly with respect to the other member of the pair a distance equal to one-half of one pole pitch. This places the teeth of a shifted stator segment between the alternating magnetic poles of the rotor while the teeth of the unshifted segment are directly opposite the poles. When the rotor is moved, the reluctance torque, or magnetic cogging due to one member of a pair, virtually cancels the reluctance torque of the other member of the pair.

Abstract: An alternator assembly for an automotive vehicle including a rectifier device composed of a plurality of diodes supported on a negative-side cooling fin of semi-circular arc shape, a plurality of diodes supported on a positive-side cooling fin of semi-circular arc shape, and a terminal board supporting a plurality of terminals connected to the diodes. The rectifier device is assembled and held in a unitary structure by a plurality of metal members, and arranged in a space defined by an end frame and a rear cover of the alternator assembly in such a manner that the metal members are in contact at one end thereof with the rear cover and at the other end thereof with the end frame.

Abstract: A wind actuated turbine which causes a magnet-brush spinner and a copper foil covered disc spinner to counter rotate and generate electricity by the Faraday Principle.