Abstract: A method of and apparatus for measuring the vibration amplitude of an electromagnetic vibratory motor is disclosed in which the current induced in the coils of the motor is sensed and differentiated and applied to dividing means where it is divided by the sensed induced voltage induced in the coils to produce a signal proportional to the instantaneous reluctance of the coils of the vibratory motor. The instantaneous reluctance signal is filtered to remove the line frequency harmonic therein, and this filtered signal is peak detected to produce the vibration amplitude signal. Means are also provided to eliminate the problem associated with the dividing means if the sensed induced voltage approaches zero.

Abstract: The motor comprises a flexible circuit composed of a substrate disposed in an air gap between the stator and the rotor, bearing a coating of copper etched to produce the various circuit components. Conductive paths carry the current to brushes soldered on zones of the circuit. Another path leads to further zones constituting shorted turns interconnected by striated areas constituting resistor elements.

Abstract: A linear pulse motor which includes: a primary magnetic flux generating unit composed of a pair of cores each having a coil wound therearound and a plurality of magnetic poles provided at end portions thereof; and a scale having a row of first teeth formed therein along a direction of relative travel thereof with respect to the magnetic flux generating unit, the scale and the flux generating unit being disposed so that the scale relatively moves with respect to the primary magnetic flux generating unit by generating magnetic flux between gaps formed between the magnetic poles and the teeth facing to the magnetic poles. The magnetic flux generating unit includes a spacer through which the cores are jointed in a parallel manner. Each core has a pair of arms and a substantially U shape, the core being provided on each end of the arms thereof with the magnetic pole.

Abstract: A rotor for a synchronous motor, having a plurality of first magnetic poles (19) formed by a plurality of permanent magnets respectively and disposed at practically equal circumferential intervals on the outer circumference of a yoke (18) fixed to a rotatable motor shaft (14), and a second magnetic pole (18a) projecting radially from the yoke (18) adjacently to each first magnetic pole (19) so as to form a pair of a first magnetic pole (19) and the second magnetic pole (18a), wherein the shape of the pole face of each second magnetic pole (18a) is decided so that the magnetic flux distribution established by a pair of the first magnetic pole (19) and the second magnetic pole (18a) is practically equivalent to a sinusoidal magnetic flux distribution in the sweeping effect by the armature coils of each phase of the stator (11).

Abstract: A magnetic structure including a stator including sensor windings and a field exciter, and a movable armature having a variety of applications, including a synchro resolver and a tachometer. The stator comprises a plurality of planes of oppositely polarized parallel magnetic pole pieces contained in an annular or toroidal structure of rectangular cross-section to circumferentially surround the movable rotor or armature. The parallel pole pieces of opposite polarity form a segment extending radially inward, and are surrounded by a plurality of sense windings, wherein the rotor selectively provides a relatively low reluctance path to one or more of the pole pieces, causing a change in flux and corresponding voltage to be produced in the sense windings. In one embodiment, the pole pieces are energized by a permanent magnet located in the stator to produce a tachometer output voltage upon the sense windings. In that configuration the sense winding signals vary in amplitude according to velocity and position.

Abstract: A controlled force variable reluctance actuator. A variable reluctance actuator having a moving element operated by a solenoid is provided in which the current in the solenoid is controlled by a signal representative of the flux density in the magnetic circuit of the actuator. The signal is produced by a Hall effect device placed in the magnetic circuit. Preferably, the Hall effect device controls the current in the solenoid by controlling its duty cycle; however, continuous control of the current may also be employed. Alternative embodiments are provided for a constant force actuator, an actuator whose force-displacement characteristic is altered, and an actuator in which the force may be selectively controlled. An embodiment is also provided for selectively controlling the position of the moving element based upon measured electric and magnetic parameters of the actuator.

Abstract: A device for monitoring the circumferential speed of a toothed disc (1) capable of being rotated, with a sensor (4) arranged at a defined distance (s) from the toothed rim (2) of the toothed disc (1) and with a sensor casing (7) supported at and securable to a stationay guide member. In order to avoid the need of any additional adjustment of the distance (s) in the event of remounting the sensor (4), a bushing (9) is provided as a guide member which is adapted to be fastened to a carrier element (14) by screw means and which projects into a bore (8) of the casing (7). To arrange a threaded bore (15) in the casing (7), the bore (15) is adapted to accommodate a screw (16) into contact with the bushing (9).

Abstract: The present invention relates to a synchronous electric motor of the type comprising at least one rotor part, substantially of annular disc form, magnetized so as to present on at least one of its opposite planar surfaces at least one series of magnetic poles of alternating polarities, disposed regularly along at least one annular zone, said rotor part being mounted on a rotatable shaft, the motor additionally comprising at least one assembly of several elementary magnetic circuits of a magnetically permeable material and at least one annular electric energizing coil coupled with said assembly of magnetic circuits, each of said circuits having at least one air-gap, and all of said air-gaps being arranged for cooperating with the said magnetic poles of an annular zone of said rotor part, each of said elementary magnetic circuits comprising at least two rectangular and essentially flat pole parts, which are arranged substantially radially with respect to said shaft of the rotor.

Abstract: A device is disclosed for translating the bidirectional, incremental rotation of a disk drive motor of the electric stepping type into the reciprocating, stepwise displacement of a magnetic transducer head in a radial direction of a disklike record medium in a data transfer apparatus employing such record medium. The device includes a lead screw driven by the drive motor and extending parallel to the path of the transducer head. Slidably engaged in the helical groove in the lead screw is an engagement member, such as a ball or pin, which is supported on the head carriage of the data transfer apparatus for causing the linear travel of the transducer head in response to the rotation of the lead screw. The engagement member is affixed to a first cantilever spring on the head carriage, thereby to be biased into working engagement with the lead screw. A second cantilever spring on the head carriage acts on the first cantilever spring and coacts therewith to urge the engagement member against the lead screw.

Abstract: The present invention is directed to an engine and method for converting heat energy to electrical current. The engine includes a heat source with a heat exchanger. Dipole antennas receive heat energy and immediately convert it to electrical current which is then rectified before flowing to a load.

Abstract: A variable reluctance actuator, of either the linear or rotary type, having a moving element operated by a solenoid, is controlled by a Hall effect sensor signal representative of flux density in the magnetic circuit of the actuator. The actuator may be operated in either a constant-force control mode, or a position-sensing or control mode. Substantially constant force, independent of position of the actuator's movable element, is obtained by varying, rather than stabilizing, the sensed magnetic field during movement. Position sensing, independent of actuator force, is obtained by variably controlling the magnitude of the excitation current of the Hall effect sensor in response to the magnitude of the coil current and Hall sensor output.

Abstract: A construction for actuator assemblies is disclosed using a material of low permeance as a structural element, included normal to the axis of coil movement to lower coil inductance by reducing reactance flux in support structures and providing a channel for eddy currents set up in response to coil reactance. The net result is enhanced coil responsiveness to energization.

Abstract: A moving object stop control method using a linear motor comprising a movable element mounted to the moving object and a pair of stators disposed to put therebetween the stop position of the moving object, the pair of stators being applied with exciting voltages opposite phase to each other, the exciting voltages each being reduced of amplitude only by a desired magnitude intermittently with the predetermined timing.

Abstract: An induction motor is suggested with a permanent magnet rotor and a stator which is excited electromagnetically by an alternating field, whereby an electrically conductive rotor outer part (17) is mounted between a freely rotatable permanent magnetic rotor inner part (16) and the stator poles (11,12) in the form of a hollow cylinder or a short circuit cage. The rotor outer part (17) rotates in form of a cage runner asynchronous and drives the connected load, after the start of the permanent magnetic inner part (16) which runs synchronous in the continuous operation. A rotating direction arresting device (36,37) assures a defined rotating direction of a drive shaft (27).

Abstract: To retain end portions (10,11) of armature conductors in slots (6, 37) formed in radially projecting lugs (5) of armature segments (2) of a commutator (1), the side walls of the slots are formed with a deviation from a plane surface, for example by a recess (7) or an inwardly extending projection (38), and the end portions (10, 11) of the windings are then placed in the slot and deformed under punch or stamping pressure to form, together with the recess or the region adjacent the projection, an interfitting projection-and-recess connection which will withstand high centrifugal forces, and prevent loosening of the connection under conditions of shock, vibration, high temperatures and temperature changes, to make the connection particularly suitable for installation in mobile, typically automotive dynamo electric machines.

Abstract: Electric motor with a substantially cylindrical air gap between the stator and the rotor, the stator being fitted to a bearing support for the rotor shaft bearing. In order to reduce noise emissions, the stator is connected to the bearing support by means of an elastic damper and the stator and bearing support are separated from one another by an air gap adjacent at least part of their facing faces.

Abstract: A variable reluctance motor having tapered stator teeth and more rotor teeth than stator teeth. The width of the stator and rotor teeth provides a relatively high rotor tooth ratio and a relatively low stator tooth ratio. With this configuration the motor has very low torque ripple. Magnetic saturation is limited to the tips of the stator teeth, so the motor can be operated at current levels above the saturation point, producing a linear torque to current function and high output torque.

Abstract: A slip ring assembly for an alternator or like electrical apparatus is disclosed which has been particularly configured for highly efficient formation by an injection molding process. The assembly includes a unitary body configured for mounting on the rotor shaft of the associated apparatus, with the assembly further including first and second axially spaced slip ring members positioned on the body. First and second terminals are provided which are respectively electrically joined to the first and second slip ring members, with the terminals extending axially of the body and outwardly of an end of the body which is adjacent to the first slip ring member. The configuration of the body of the assembly is such that it can be very efficiently injection molded, with the slip ring members and terminal elements thereafter positioned on the body for completing fabrication of the assembly.

Abstract: The liquid lithium may be used in a magnetohydrodynamic generator to produce the electrical power. The lithium expansion in the generator is accomplished by a gas whose expansion process is kept nearly isothermal from the high rate of heat transfer from lithium to the gas. The near-constant temperature of lithium in the generator is produced by a chemical reaction with the oxidizer gas sulfur hexafluoride which is also used to expand lithium at a high velocity. Since the oxidizer gas is depleted as it reacts with the fuel lithium, another gas such as helium is introduced at the generator inlet to accelerate the liquid metal across the magnetic field which is applied perpendicularly to the main flow direction. The liquid metal lithium combustion with the sulfur hexafluoride yields a high rate of energy release and the products of combustion are liquids above 1065 degrees Kelvin.

Abstract: A linear DC permanent magnet motor comprising a wound member having a plurality of windings wound on a slotted magnetic structure and a field member movable relative to said wound member, the field comprising permanent magnet means for developing a magnetic field and means for energizing with DC current at least some of the windings, the magnetic field of said permanent magnet means interacting with the energized windings causing said field member to move relative to said wound member. The motor also comprises support means for maintaining air gaps between the wound member and the field member.