| Patent Number |
Title Of Patent |
Date Issued |
| 5173651 |
Electrical drive systems |
December 22, 1992 |
| A direct current brushless electric motor has a rotor, and a stator with inwardly extending teeth, between each pair of which a winding slot is defined. The radially inward face of each tooth has a dummy slot shaped so the reluctance forces between rotor and stator due to the presence of |
| 4859807 |
Wire scribed circuit boards and method of manufacture |
August 22, 1989 |
| This invention relates to interconnection circuit boards and processes for making and modifying interconnection circuit boards wherein adhesive is applied to a wire used in scribing a conductor pattern. The adhesive is activated to a tacky state during the wire scribing operation which f |
| 4853604 |
Position and speed sensors |
August 1, 1989 |
| In a sensor having a drive winding for establishing a forward field, an electrically conductive screen is displaceable relative to a sense winding. In the presence of the drive field, eddy currents are generated in the screen to establish a counter-field opposing the forward field, so |
| 4818322 |
Method for scribing conductors via laser |
April 4, 1989 |
| This invention relates to a method of using laser energy for bonding and stripping conductors during the scribing operation. The method provides and directs discrete laser beam pulses of substantially the same energy content at a rate which continuously varies as the conductor feed rate |
| 4797592 |
Dynamo electric machine with upwardly shifted ripple frequency |
January 10, 1989 |
| A rotary electric dynamo machine in which the ripple component in the output occurs at a higher frequency. One half of the pole faces have a nonuniform airgap while the other half have a uniform air gap and cover a noninteger slot distance. The armature has an odd number of slots. Instea |
| 4782272 |
Electrical drive systems |
November 1, 1988 |
| A direct current brushless electric motor has a rotor, and a stator with inwardly extending teeth, between each pair of which a winding slot is defined. The radially inward face of each tooth has a dummy slot shaped so the reluctance forces between rotor and stator due to the presence of |
| 4763057 |
Control for improving induction transient response by excitation angle control |
August 9, 1988 |
| A variable frequency AC induction motor servo control system wherein slip is momentarily increased in response to error signal transients. In a preferred embodiment, a phase shift is introduced in the energizing stator current as the servo velocity error signal increases over at least th |
| 4763056 |
Power supply systems for reluctance motors |
August 9, 1988 |
| In a power supply system for a variable reluctance motor, each phase winding of the motor is connectible across a pair of supply rails by first and second switch means located respectively between the first supply rail and the winding and between the winding and the second supply rail. T |
| 4750092 |
Interconnection package suitable for electronic devices and methods for producing same |
June 7, 1988 |
| An interconnecting package for attaching electronic devices, such as semiconductor chips, to an interconnection board and processes for the production and mounting thereof. The interconnection package comprises a multiplicity of metallic leads or pins aligned in a regular array and a |
| 4743710 |
Coaxial interconnection boards |
May 10, 1988 |
| In making coaxial interconnection boards according to this invention coaxial conductors are scribed onto a circuit board substrate. The coaxial conductors are preformed and affixed in a predetermined pattern on the substrate using an adhesive. A conductive layer forming a ground plane |
| 4733149 |
Adaptive control system |
March 22, 1988 |
| A real time adaptive control capable of maintaining stable operation with changing inertia. The controller utilizes a pseudo-derivative feedback (PDF) type control wherein dynamic adjustment is achieved by adjusting only a single variable. The variable can be controlled as a function of |
| 4729160 |
Method for manufacturing a composite sleeve for an electric motor |
March 8, 1988 |
| In an electric motor having a plurality of magnets bonded to a rotor hub, a composite sleeve is disposed over the rotor hub and magnets. The composite sleeve may be wound directly upon the rotor hub, or the composite sleeve may be wound upon a mandrel and slid over the rotor hub. |
| 4712005 |
Floating mask encoder with assembly spacer |
December 8, 1987 |
| In an optical shaft encoder for converting rotary motion to an electrical signal, a shaft is rotatably mounted in a base and has a code disk attached thereto. A light source and photodetector are disposed on opposite sides of the code disk. The photodetector is covered by a mask whic |
| 4711026 |
Method of making wires scribed circuit boards |
December 8, 1987 |
| This invention relates to interconnection circuit boards and processes for making and modifying interconnection circuit boards wherein adhesive is applied to a wire used in scribing a conductor pattern. The adhesive is activated to a tacky state during the wire scribing operation which f |
| 4706206 |
Color printing control using halftone control areas |
November 10, 1987 |
| In a multi-color printing process, measurements of the optical density of two different three-color halftone control areas are used to calculate dot gain and solid density of the cyan, magenta and yellow images. Since no single-color solid control targets are used, control targets may be |
| 4703243 |
Stepping motor harmonic suppression |
October 27, 1987 |
| A stepping motor including a plurality of stator poles wherein the stator poles are non-symmetrically displaced from their normal position to reduce harmonics in the torque/displacement crossing of the motor. |
| 4698537 |
Electrical drive systems incorporating variable reluctance motors |
October 6, 1987 |
| In a two-phase salient pole variable reluctance motor in which the number of stator poles is four or a multiple of four, alternate stator poles carry windings of different phases and each stator pole has an elongated pole shoe, so that the pole tips of each adjacent pair of stator poles |
| 4693778 |
Apparatus for making scribed circuit boards and circuit board modifications |
September 15, 1987 |
| This invention relates to an apparatus for making circuit boards in which insulated conductors are applied and bonded to a nonconductive surface to form a conductive path between contact points thereon in a predetermined precise pattern. |
| 4686437 |
Electromechanical energy conversion system |
August 11, 1987 |
| An electromechanical energy conversion system comprising a brushless motor and a stored program controller for controlling motor operation in a plurality of modes in accordance with internally generated and/or external commands. |
| 4683036 |
Method for electroplating non-metallic surfaces |
July 28, 1987 |
| Method for electroplating non-metallic surfaces on a substrate, e.g. of plating holes in metal clad laminates, is disclosed. Metallic sites are formed on the surface and the resulting site-containing surface is electroplated by means of an electroplating bath comprising a component w |
| 4682093 |
Power supply systems for inductive elements |
July 21, 1987 |
| In a power supply system, an inductance L is connected between a rail at a voltage V.sub.1 and a rail at earth through a switch S. When the switch is opened, a current i.sub.2 flowing from the inductance L is directed to a third rail through a diode D, voltage on the third rail rising to |
| 4679321 |
Method for making coaxial interconnection boards |
July 14, 1987 |
| An interconnection board for high frequency signals is made by wire scribing coaxial conductors. The board is provided with holes. The coaxial conductors with signal conductor surrounded by a dielectric in turn surrounded by a conductive shield are wire scribed on a first surface of |
| 4679313 |
Method of making a servo motor with high energy product magnets |
July 14, 1987 |
| A method of making an electric motor with the stator winding inside a slotless cylindrical stator shell. |
| 4677298 |
Method of monitoring ink-water balance on a lithographic printing press |
June 30, 1987 |
| In a lithographic printing system, a light source and a plurality of photodetectors are used to monitor the amount of fountain solution interacting with the ink. The light source irradiates an ink form roller and the photodetectors are disposed at a specular angle and at one or more |
| 4672007 |
Electrodeposition composition and process for providing a Zn/Si/P coating on metal substrates |
June 9, 1987 |
| The present invention provides an aqueous composition and process for the electrodeposition of a layer of zinc containing silicon and phosphorus on a metal substrate. The electrodeposition composition is prepared by reacting metallic silicon and zinc with phosphoric acid and an alkali |
| 4670696 |
Variable speed variable reluctance electrical machines |
June 2, 1987 |
| A drive system includes a reluctance motor, driving a load. The motor has stator and rotor poles and magnetizing windings for each stator pole. The airgap is small so that saturation occurs during pole overlap, and the poles are constructed so that there is torque overlap between phases |
| 4668532 |
System for selective metallization of electronic interconnection boards |
May 26, 1987 |
| An improved process for selective metallization of insulating substrates, as for example in the manufacture of wire scribed interconnection boards, is provided. The substrates optionally include one or more holes or cavities for electrical connections. The process comprises applying an |
| 4666744 |
Process for avoiding blister formation in electroless metallization of ceramic substrates |
May 19, 1987 |
| A process for avoiding blister formation between a metal layer which is electrolessly deposited on a surface of a ceramic substrate and the substrate. The substrate is adhesion promoted with an alkali metal composition containing between 0.35 and 0.9 mole fraction alkali metal compou |
| 4662944 |
Process and composition for sensitizing articles for metallization |
May 5, 1987 |
| Non-metallic articles are sensitized for deposition of adherent metal from electroless metal solutions in contact therewith by treatment with a first medium including cuprous ions and stannous ions thereby absorbing on the surface in situ at least said cuprous ions; thereafter treating t |
| 4661756 |
Servomotor control systems |
April 28, 1987 |
| In a servo control system for a reluctance motor, the output of a reference waveform generator is applied to a power converter through a current controller. Under standstill conditions, at least two of the motor windings are energised so that both forward and reverse torques are esta |
| 4647477 |
Surface preparation of ceramic substrates for metallization |
March 3, 1987 |
| A process for preparing a ceramic substrate for metallization wherein a surface of the ceramic substrate is contacted with an admixture comprised of an inert solid material and a composition containing one or more alkali metal compounds. The admixture and the substrate are heated at leas |
| 4646436 |
Shielded interconnection boards |
March 3, 1987 |
| Discloses a method for making a coaxial conductor interconnection circuit board, as well as the board per se, by providing a first conductive coating on a substrate, scribing an insulated wire signal conductor pattern on the first coating and a second conductive coating over the wire |
| 4645997 |
Transient free solid state automatic power factor correction |
February 24, 1987 |
| In an apparatus for controlling the power factor of a power distribution system connected to inductive loads, banks of delta connected capacitors are added to or removed from the power lines of the power distribution system by a plurality of solid state switching devices which are under |
| 4644199 |
Linear DC permanent magnet motor |
February 17, 1987 |
| 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 energi |
| 4642321 |
Heat activatable adhesive for wire scribed circuits |
February 10, 1987 |
| A non-blocking, solid, adhesive composition comprising, (a) a film forming polymeric resin of average molecular weight between 10,000 and about 100,000 and having an epoxide, hydroxyl or unsaturated functionality greater than about 2, the polymeric resin being selected from the group |
| 4633151 |
Series connected transistor protection circuit |
December 30, 1986 |
| In a motor control system of the type having a plurality of transistors connected in series between a power supply and ground, a protection circuit is utilized to prevent the transistors from turning on simultaneously. The protection circuit introduces time delay into the turn on sig |
| 4631408 |
Method of simultaneously determining gauge and orientation of polymer films |
December 23, 1986 |
| In the manufacture of a multilayer polymer film, the thickness and degree of orientation are simultaneously measured. A beam of infrared radiation having predetermined wavelengths is either transmitted through or reflected by the polymer film to be measured and received by a photodet |
| 4604299 |
Metallization of ceramics |
August 5, 1986 |
| An article comprised of metal directly and adherently bonded onto a ceramic substrate, and a process for producing same, wherein the ceramic is adhesion promoted with molten inorganic compound, treated with halide compounds that promote adsorption of catalyst for metal deposition, and |
| 4602318 |
Substrates to interconnect electronic components |
July 22, 1986 |
| Substrates for interconnecting components in which a filament is applied and affixed to a base in a pre-determined pattern, the base surface and applied filaments are coated with a coating and the coating is hardened to form a substantially flat surface over the base and filaments. The c |
| 4601916 |
Process for bonding metals to electrophoretically deposited resin coatings |
July 22, 1986 |
| An economical process for producing metal plated through holes in metal core circuit boards which permits the formation of small holes and fine conductor lines is disclosed. A metal sheet, which will become the core of a metal core circuit board, is provided with insulation layers on bot |
| 4594311 |
Process for the photoselective metallization on non-conductive plastic base materials |
June 10, 1986 |
| Catalytically imaged thermosetting and thermoplastic resin objects including printed circuit boards are provided. A hydrophilic, adhesion promoted insulating base material is treated in selected areas to produce metallic nuclei in the form of an image of a desired metal pattern. The |
| 4593368 |
Technique for measuring very small spacings |
June 3, 1986 |
| The spacing between two surfaces such as the space between a glass disk and a magnetic head or slider is measured by directing light from a broad spectrum light source onto the two surfaces, and combining the reflected light, with the light at different frequencies being combined con |
| 4579012 |
Compact electromechanical actuator |
April 1, 1986 |
| A compact actuator is disclosed in which the motor, gear reduction and motion control functions are performed by an integral array of components. Instead of having separate interconnected units to perform these functions, the integral array compacts these functions into a single unit, |
| 4574094 |
Metallization of ceramics |
March 4, 1986 |
| An article comprised of metal directly and adherently bonded onto a ceramic substrate, and a process for producing same, wherein the ceramic is adhesion promoted with molten inorganic compound, treated with compounds that promote adsorption of catalyst for metal deposition, and plated wi |
| 4572999 |
Brushless tachometer |
February 25, 1986 |
| A brushless tachometer in which output signal switching is achieved using field effect transistors and which is capable of achieving linearity over a broad range, particularly the zero speed region. According to a preferred embodiment, the brushless tachometer is operated in a current |
| 4565966 |
Method and apparatus for testing of electrical interconnection networks |
January 21, 1986 |
| A method and apparatus for testing circuit boards using two or a small number of probes for making resistive and radio frequency impedance measurements e.g. capacitive measurements. The combination of resistive and impedance measurements substantially reduces the number of tests requ |
| 4562399 |
Brushless DC tachometer |
December 31, 1985 |
| An alternator for use in a brushless DC tachometer which produces are output voltage with a trapezoidal waveshape. The alternator includes a three phase toroidal winding on a plotless core. The windings are concentrated rather than being distributed. The rotor includes high intensity |
| 4562393 |
Modulation scheme for PWM-type amplifiers or motors |
December 31, 1985 |
| In a motor control system for a DC motor, a modulation circuit provides a plurality of pulse width modulated signals to control the current applied to the motor. The motor is coupled to a current sensing resistor and a plurality of switches responsive to the pulse width modulated control |
| 4559485 |
Control systems for AC induction motors |
December 17, 1985 |
| An AC induction motor control system wherein two pulse trains are generated, one pulse train including a pulse for each increment of rotor movement, and the other pulse train having pulses occurring at a rate proportional to slip. The pulse trains are combined in a counter which cont |
| 4551646 |
Double coil constant force extension spring bracket |
November 5, 1985 |
| A brush holder assembly providing longer brush life and easy brush replacement is disclosed. The assembly uses a removeable spring bracket to extend a double coil constant force extension spring straddling a brush. The bracket, straddling the spring and brush, is inserted into a brush |
