Abstract: A transformer including a piezoelectric plate and interdigital electrodes is provided. The interdigitated electrodes includes a plurality of conductive strips disposed over the piezoelectric plate. A cross-sectional Lamé mode resonance is excited in a cross sectional plane of the piezoelectric plate in response to input voltage applied through the interdigitated electrode, producing a voltage gain. A device including the aforementioned transformer is also provided.

Abstract: A commutator (10, 40, 54, 60, 64, 70, 76, 78) for a brush motor includes a cylindrical insulating base (12), a plurality of segments (14) disposed on an outer surface (68) of the insulating base (12), circumferentially spaced from each other, and defining a plurality slots (42) between adjacent segments (14), and a plurality of insulating outgas elements (24) capable of releasing a gas having a lower conductivity than air and disposed on the outer surface (68) of the cylindrical insulating base (12). Each outgas element (24) is located between a corresponding pair of the plurality of segments (14), having a gas releasing surface (26) between the corresponding pair of segments (14) and lower than outer surfaces (28) of the corresponding pair of segments (14). A method for making a commutator is also provided.

Abstract: A brush direct current motor has a first connecting portion and a second connecting portion for respectively connecting the positive and negative electrode of a direct current power source, a stator having a number of coils corresponding to N phases, a rotor, a current converting device and a spark suppression circuit. The spark suppression circuit has N branches. Each branch comprises a first diode and a second diode, the cathode of the first diode and the anode of the second diode are respectively connected to the first connecting portion and the second connecting portion, the anode of the first diode and the cathode of the second diode are connected to a corresponding phase.

Abstract: A brush direct current motor has a first connecting portion and a second connecting portion for respectively connecting the positive and negative electrode of a direct current power source, a stator having a number of coils corresponding to N phases, a rotor, a current converting device and a spark suppression circuit. The spark suppression circuit has N branches. Each branch comprises a first diode and a second diode, the cathode of the first diode and the anode of the second diode are respectively connected to the first connecting portion and the second connecting portion, the anode of the first diode and the cathode of the second diode are connected to a corresponding phase.

Abstract: An electromagnetically excitable coil having a wire, the wire being wound around a wire holder in one winding direction, the wire having a winding start, which generally is disposed at a first end of the coil, and a winding end, which generally is disposed at the same end of the coil, using an uneven number of winding layers, the coil having an elongated cross-section and the cross-section having a longer side and a shorter side, the wire being routed from the second end of the coil to the first end of the coil while forming at least one wire crossing at the shorter side of the cross-section.

Abstract: The mold commutator of the present invention comprises a plurality of commutator segments made of copper or copper alloy and circumferentially arranged, a plurality of spark absorbing elements, disposed between adjacent commutator segments, with paired parallel surfaces respectively having electrodes thereon, and a resin mold portion which integrates these portions into one piece. The spark absorbing element is electrically connected to the commutator segment via the electrode, and spark voltage generated at the commutator segment is absorbed by current flowing between the electrodes.

Abstract: A stator has four or more magnetic poles. A commutator has a plurality of segments arranged in the circumferential direction and a short-circuit conductor for short-circuiting predetermined segments from among these segments. Each segment has an angular width WS, and there is a gap of an angular width WU between the segments. A substantial angular width WB of each of an anode brush and a cathode brush satisfies (n?1)(WS+WU)+WU<WB<n(WS+WU)+WU, where n is an integer no less than two. A plurality of coils are each connected to the corresponding one of the segments in order to form n closed loops. The closed loops each pass through the corresponding segments and are electrically independent of each other.

Abstract: A collective monitor and control for plural networks, in which plural networks remotely located in each other can be collectively monitored, is provided. The collective monitor and control system for plural networks includes independent plural networks, each having plural nodes formed into a ring configuration, transmission paths connecting the plural networks and passing only monitor and control data, and a network service processor connected to one node of the plural networks, the one node connected to the network service processor having a switch circuit for broadcasting the monitor and control data received from one route to other routes linked to the one node.

Abstract: In order to reduce the wear on the brushes (6) and thus extend the operating lives of the brushes and of the commutator motor, brush sparking on the trailing edges (6.2) of the brushes (6) is reduced a commutation magnetic field (M), produced for example by an additional magnet (4) placed axially behind the brushes (6), such that the magnetic field (M) deflects the moving charge carriers in the brushes (6), to thereby reduce the current density at the trailing edges (6.2) of the brushes (6).

Abstract: An improved electric motor having a commutator and brushes incorporates a fluid comprising one or more stable halogenated aliphatic hydrocarbons which is liquid from ambient temperatures up to about 150.degree. F., and means for applying said fluid continuously to brushes adjacent said commutator while the apparatus is running.

Abstract: The apparatus for feeding fuel to a motor vehicle engine from a fuel tank includes a pump portion and a direct current drive motor located in a housing part and through which the fuel flows. The commutator device of the drive motor includes commutator brushes located on the positive side and on the negative side; brush contact springs made from electrically conductive material located on the positive side and on the negative side, and a collector having a sliding surface for the brushes which are pressed on it during operation by the contact springs. To improve reliability of operation of the apparatus a negative potential is applied to the brush contact springs on the positive side and on the negative side and the brush contact springs on the positive side are electrically insulated from the commutator brushes on the positive side.

Abstract: A drive circuit for a wire dot print head including a driving coil, a print lever attracted by the coil in a first direction, a spring for biasing the print lever in a second opposite direction and a damper includes a DC power source connected to a first end of the driving coil. A transistor is connected to the second end of the driving coil. An output circuit provides a gated output to the transistor. The output circuit receives as a first input a print data signal and as a second input a signal from a reference timing signal generator. The reference timing signal generator includes a drive pulse signal generator which provides an output in response to a print timing pulse which causes the output circuit to provide an output for the driving coil to attract the print lever.

Abstract: Commutator apparatus for electric motors includes electrical conductors making electrical contact with brushes through substantially three hundred sixty degrees of rotation of the commutator to provide current paths during time periods of current flow to prevent arcing. The commutator apparatus further includes cylindrical portions and blade portions which overlap and on which brushes are positioned to make the electrical contacts.

Abstract: Disclosed is a method of transferring energy from a stationary generator of power at radio frequencies to a rotating work station such as a coil to heat inductively by selectively connecting the generator as the work station rotates past the generator. A pair of stationary contact strips connected to the generator are used to connect the low voltage, high current radio frequency (RF) energy to the rotating machine. The contact strips are a commutating device in that they can intermittently be connected to a series of brushes or contactors carried by work stations requiring power. The contact strips form a closed loop which shunts the energy at the point where the brushes engage and/or leave the contact strips thereby keeping the current flow to a minimum at those points. As the brushes slide across the contact strips they move from the shunt to the power input points on the contact strips and where the current flow increases because the voltage difference between the strips is the greatest.