Abstract: A bearing monitor for use with a canned motor pump having a wound stator and a rotor drivably coupled to an impeller, the rotor being mounted on radial journal bearings and axial thrust bearings within a containment can comprises a first and a second target embedded in an outer periphery of the rotor in axial proximity to a first and a second end of the rotor. The monitor includes a plurality of sensors mounted external to the containment can in axial proximity to each of the two targets and radially displaced approximately equally around the periphery of the containment can. A plurality of magnetic field generators create local magnetic fields coupled through the containment can, process fluid, rotor, and at least a portion of one target to one of the sensors. In response to each field, each sensor generates an output signal which varies as a result in a change in the magnetic circuit reluctance caused by bearing wear.

Abstract: Apparatus for detecting a dry bearing condition utilizes an ultrasonic transducer which is intermittently pulsed a certain number of times by a microprocessor and associated circuitry. The number of return pulses received by the ultrasonic transducer is detected by the microprocessor and is used to determine whether a dry bearing condition exists.

Abstract: A rotor position sensing system (10) for a variable reluctance motor having a plurality of phases .PHI..sub.1 -.PHI..sub.3 with each phase having a phase winding wound on stator poles (18, 20 and 22) and first and second switches (Q.sub.1 and Q.sub.2, Q.sub.3 and Q.sub.4, and Q.sub.5 and Q.sub.

Abstract: An alternating current generating system (40) for an air frame producing an output potential in accordance with the invention includes a generator (42) for generating current having a rotor (46) mounted on a shaft (50) which is rotatably driven and a stator (58) from which current is outputted; a variable reluctance generator (44) for generating alternating current outputted from a stator (62) and having a rotor (48) mounted on the shaft to cause alternating current to be generated by the stator and a voltage regulator (84), coupled to the generator for generating current, to an output of (88) of the variable reluctance generator and to an excitation winding (86) of the variable reluctance generator, for producing excitation current applied to the stator of the variable reluctance generator to regulate the voltage outputted by the variable reluctance generator.

Abstract: A hybrid electrical generator (20) is disclosed. The hybrid electrical generator has a permanent magnet generator (22) having a permanent magnet rotor (32) mounted on a shaft (26) with the permanent magnet generator providing an output voltage over an operating range which falls in response to an increasing electrical load. The hybrid electrical generator has a variable reluctance generator (24) having a rotor (34) mounted on the shaft with excitation of a stator (30) being provided by the permanent magnet generator. The variable reluctance generator provides an output voltage which varies in response to an increasing load over an operating range. A voltage regulator, responsive to the electrical outputs of the generators, controls the output voltage of the variable reluctance generator to provide a regulated output voltage which is substantially constant independent of electrical load over an operating range.