Abstract:
Methods of manufacturing electrical resistance heating elements (200) are provided which include mating a pair of polymeric components (220, 280) around an electrical resistance heating material (218) prior to fusing the polymeric components together, preferably by heat or pressure or both, while also evacuating a quantity of air from the seam between the components, before, after, or during the fusing step.
Abstract:
A winding form assembly for a stator winding machine includes a pair of winding forms (40, 42) mounted on a stator pole piece (24) and a latch assembly for latching the winding forms (40, 42) to one another. Two ways to support the forms (40, 42) on the pole piece (24) and two latch mechanisms are disclosed.
Abstract:
A tight-tolerance, low-resistance, high-power chip resistor for mounting on a circuit board (14) in parallel and adjacent relationship to such board. There are discrete terminal plates (11, 12) mounted on one surface of a substrate (10) in spaced-apart relationship to each other but still quite close to each other. Electrical connections are made by the customer to the terminal plates (11, 12), at different regions thereof, without adversely affecting the tight-tolerance relationship. The terminal plates (11, 12) additionally provide heat spreading from the resistance film (25), enhancing the power handling capability of this low-resistance, high-power chip resistor.
Abstract:
A PTC thermistor chip which enables easy visual inspection of a soldered portion when it is mounted on a printed board and also enables flow soldering. The chip comprises a first main electrode (12a) and a first sub-electrode (12b) both provided on a first surface of a cuboidal conductive polymer (11) a positive temperature coefficient, and a second main electrode (12c) and a second sub-electrode (12d) both provided on a second surface facing the first surface, with the first main electrode (12a) and the second sub-electrode (12d) and with the first sub-electrode (12b) and the second main electrode (12c) being electrically connected by first and second side electrodes (13a, 13b), respectively.
Abstract:
A resistor which is used for high-density wiring circuits, reduced in current noise, and improved in resistance-value accuracy, and a method for manufacturing the resistor. The resistor is provided with a substrate (21), a pair of upper-surface electrode layers (22) formed on the side sections of the upper surface of the substrate (21), a resistance layer (24) formed so that the layer (24) may be connected electrically to the electrode layers (22), a first trimming groove (25) formed by cutting the resistance layer (24), a resistance restoring layer (26) which is formed to cover the first trimming groove (25), a second trimming groove (27) formed by cutting the resistance layer (24) and the resistance restoring layer (26), and a protective layer (28) provided to cover at least the resistance layer (24) and the second trimming groove (27) so that the current noise from the resistor may be reduced and the resistance-value accuracy of the resistor may be improved by means of the resistance restoring layer (26) and the second trimming groove (27).
Abstract:
A device for making resistors of insulated wire comprises a mechanism (9) receiving the wire (3) reeled off from the resistor (4) placed in a fixing mechanism (5); a current-feeding and a current-collecting electrode (2) intended for resistance and capacitive coupling of the reeled off wire (3) with a metering circuit and with a harmonic osicillator (1); electrical contact elements (6) and (8) of the mechanisms (5) and (9); an emitter follower (10) its potential input being connected to the electrical contact element (6) and its output being connected to the potential input of a phase amplifier-inverter (11), the output of the latter being connected to a limiting amplifier (12) and to a precise voltage divider (14), one of the poles of which is connected, through a sample resistor (13), to the electrical contact element (8). The common point of the precise divider (14) and the electrical contact element (8) are connected, through a differential amplifier (17) having a high-resistance input, to a phase-sensitive indicator (18), the reference signal inputs of the latter being connected to the outputs of the limiting amplifier (12) and the output being connected, through unit (19) of control of a drive (20), to the drive (20), cinematically connected with the mechanism (9) of receipt of the wire.
Abstract:
A plurality of resistors are disclosed herein. The resistor may include one or more resistive elements and a plurality of conductive portions. Openings or slots, which can be configured to adjust temperature coefficient or resistance (TCR) values of the resistor, are formed in the resistive elements. The shape, quantity, and orientation of the openings or slots can vary. In one aspect, header assemblies are provided for securing or holding pins relative to the resistors.