Abstract: A method for reducing transference of structure-borne vibration to the chassis of a rotating system reduces the level of offensive acoustics resulting from vibration of the chassis. The method includes connecting a motor to the chassis with a mount that is connected to the motor at a height equal to that of a point of pivot of the motor, a shaft, and a rotary body collectively. In a preferred embodiment, the point of pivot is calculated using the oscillation period of the motor, shaft, and rotary body, when swinging collectively about the location of intersection between the rotary body and the shaft.

Abstract: A winding circuit for use in a fan includes first and second integrated circuits that each include a transistor for powering first and second fan windings in the fan, and at least one of a thermal shutdown element that switches the winding circuit "off" if the integrated circuit reaches a predetermined temperature, and a current regulating circuit. The fan includes a rotor having a magnet, and a stator having a magnet sensor to alternatively transmit current to the first and second windings, which also are located in the stator. The integrated circuits may be autoprotected MOSFETs and the magnet sensor may be a Hall effect sensor.

Abstract: A winding circuit for use with different input signals includes a first main winding, a second main winding, and an auxiliary branch having an auxiliary winding permanently and serially connected to a capacitor. The windings and auxiliary branch are alternatively configurable in one of a first configuration or a second configuration for use with respective first and second input voltages. When in the first configuration, the first main winding, the second main winding, and the auxiliary branch are connected in parallel. The input voltage signal then may be applied across the first main winding. When in the second configuration, the first and second main windings are serially connected, and the auxiliary branch is connected in parallel with one of the first and second main windings. The input voltage signal then may be applied across the first main winding and the second main winding.

Abstract: A rotating system having reduced transference of structure-borne vibration to the chassis and a reduced level of offensive acoustics resulting from the vibration of the chassis. The system includes a chassis, a motor disposed within the chassis, a shaft attached at one end to the motor, and a rotary body coupled to a remaining end of the shaft. The motor, the shaft, and the rotary body collectively define a rotary unit, which includes a pivot point proximate to which a mount is positioned to minimize the transference of structure-borne vibration from the motor to chassis.

Abstract: A turbulator for use with a fluid impelling device comprises a first side, a second side, and an apex toward which the first and second sides taper. The turbulator, circumferentially disposed about an inlet ring located adjacent the impelling device, is coaxially situated with an inlet passage of the inlet ring. The first side, second side, and apex define a triangular cross-section such that as laminar fluid flow from the second side moves over the apex of the turbulator, the laminar fluid flow is transitioned to a turbulent fluid flow on the first side prior to moving into the inlet passage. The turbulator also includes a plurality of evenly spaced slots for disrupting fluid flow symmetry within the inlet passage. The transition to turbulent flow and the disruption of fluid flow symmetry reduce acoustics as fluid is moved through the impelling device.

Abstract: A compact centrifugal fan that draws air in past the impeller hub, which encloses a motor and which spins about a central axis, and then urges the air through a bend in the fluid passageway. As the air passes through the annular inlet channel about the impeller hub, it flows in a forward axial direction. The air passes through the bend in the fluid passageway, as the air is being swept around the hub by the blades of the impeller. After the air passes through the bend, it has a reverse axial flow component, in addition to a circumferential flow component. Air having a forward axial flow component passes by the portion of an impeller blade that is closest to the impeller hub, and air having a reverse axial flow component passes the portion of a blade that is furthest from the impeller hub.

Abstract: A motor including a stator winding energization circuit on a printed circuit board. Terminals secured to the stator have stator winding ends welded thereto. For purpose of mechanically and electrially connecting the stator and the PC board, the stator is connected to the board in the manner of circuit components, by insertion of the terminals in conforming slots on the board and by wave soldering the tips of the terminals to the board's conductors.

Abstract: An integral field and commutation magnet for use in DC brushless motor has both commutation and field magnet portions. Magnetized segments in both the field and commutation portions have oppositely oriented magnetic fields in the outward radial direction. An apparatus and method for making the one piece integral field and commutation magnet employ a fixture with a current conductor associated with magnetic flux paths corresponding to the segments of the commutation and field magnet portions to magnetize a single piece of permanently magnetizable material.

Abstract: A brushless DC fan with a winding supply circuit having an internal voltage regulator can afford current limiting and thermal protection and provide various desired fan speeds without alteration of the basic fan circuit, the windings, or other manufacturing items. A voltage setting circuit element can set fan speed externally and can be used to establish various fan speeds. An internal voltage establishing circuit element sets the maximum speed. The regulator replaces the fan's protective thermistor to shut down the voltage to the windings when locked rotor occurs. Bringing out a lead for the purpose of connecting a speed controlling resistor, thermistor, or active programming means to the internal circuitry enables the fan's end user to alter operation as needed.

Abstract: A motor including a stator winding energization circuit on a printed circuit board. Terminals secured to the stator have stator winding ends welded thereto. For purpose of mechanically and electrically connecting the stator and the PC board, the stator is connected to the board in the manner of circuit components, by insertion of the terminals in conforming slots on the board and by wave soldering the tips of the terminals to the board's conductors.

Abstract: A simplified fan and brushless DC motor has a rotor with an annular permanent magnet that is magnetized in segments about its circumference and is associated with a wave-wound stator coil. Alternate circumferential segments of the magnet are oppositely polarized. Fan blades are located within the annular magnet. The wave-winding varies in position to present alternate magnetic fields opposite in direction to the rotor magnet outer surface to cause rotation thereof. The stator is ironless. The coil can have two bifilar windings alternately energized. A Hall device is, typically, employed for commutation along with suitable switching circuitry.

Abstract: A pressure relief valve particularly suitable for fluid compressors includes a valve seat and a flexible valve closure element cooperating therewith. The closure element, formed from a single sheet of spring steel or similar flexible material, includes a planar portion normally overlying the valve seat to keep the valve closed, and a pair of flexible arms joined at one edge of the planar portion and extending around either side of the planar portion and beyond the opposite edge. In position, the remote ends of the arms are fastened to the supporting structure in a plane common with the valve seat, with the planar portion overlaying the valve seat and closing the valve orifice.