Abstract: The disclosure describes a system for measuring three-dimensional coordinates comprising a position detector which detects orthogonal coordinate positions of X-, Y-, and Z-axes on a surface to be measured; a noncontact-type displacement measuring instrument which moves along the surface to be measured; a device which controls the attitude of the displacement measuring instrument; a coordinate operation processor which converts the data from said position detecting means, from said noncontact-type displacement measuring instrument, and from said device into three-dimensional coordinates of the surface to be measured; a computer which files and transfers to an external unit the data that are operated by said coordinate operation processor; and a singular point determination processor which introduces the coordinate data from said coordinate operation processor, which extracts any singular points, and which transfers the coordinates thereof to said computer.

Abstract: This invention relates to apparatus for detecting quantities of a rotary member, such as a field system, characterized in that channel identification signals and measurement data after analog-to-digital conversion are combined and then changed into a serial pulse signal by a serializer, that the serial pulse signal is modulated by amplitude modulation and then transmitted to a stationary side, and that on the stationary side, the serial pulse signal is demodulated into a plurality of original analog quantities, which are then indicated, whereby the plurality of quantities of the field system are transmitted by a single transmission system.

Abstract: The present invention relates to a ground detection arrangement for an A.C. generator in which positive and negative D.C. voltages are alternately applied to the neutral point of an armature winding so as to detect voltages proportional to ground currents corresponding to the respective D.C. voltages, a ground resistance is calculated using the sum of the absolute values of both the detected voltages, while a grounding position of a field winding is calculated using the relative sum, the calculated results being displayed, whereby the existence of grounding can be correctly detected regardless of the grounding position, and the grounding position of the field winding can be correctly known.

Abstract: The present invention relates to a ground detection arrangement for an A.C. generator in which positive and negative D.C. voltages are alternately applied to the neutral point of an armature winding so as to detect voltages proportional to ground currents corresponding to the respective D.C. voltages, and the average of the sum of the absolute values of both the detected voltages is compared with a reference value thereby to detect the existence of grounding, whereby the existence of the grounding can be detected without being affected by the grounding position of a field winding.

Abstract: An abnormal vibration monitor is used for a monitor by detecting the abnormal vibration of a rotary device placed in an explosive atmosphere by using a plurality of piezo-pick-ups. In the monitor, many signal wires and power source wires for devices are placed in an explosive atmosphere whereby there is a possibility of an explosion. In order to prevent the explosion, pre-amplifiers for detection which are respectively connected to the piezo-pick-ups and scanners for scanning the pre-amplifiers and power sources are contained in one antiexplosion casing and the casing is placed in the explosive atmosphere and the parts in the casing are connected by only small number of cables to the monitor placed in an nonexplosive atmosphere. The piezo-pick-ups are respectively fixed to parts for vibration out of the casing to give high detection accuracy.

Abstract: Each arm forming a three-phase full wave rectifier bridge includes a semiconductor diode, a current transformer and a fuse. The current transformer is connected to a pulse extinction indicator circuit through a pulse transformer. When no current flows through the arm for a predetermined time or more, the pulse extinction detection circuit produces a DC signal indicating the blowing of the fuse. The rectifier bridge, the current transformers, the fuses and the pulse extinction detection circuit are all disposed on the rotor of a brushless synchronous machine.

Abstract: The rotor of an electric rotary machine is provided with two identical transmitting devices each including an amplitude modulator and a transmitting antenna. One of the modulators modulates a carrier with clock pulses while the other modulator modulates the same carrier with a data signal from the rotor expressed by a binary digital code including pulses identical in both shape and phase to the clock pulses. The transmitting antennas are disposed symmetrically with respect to a receiving antenna located externally of the rotor to induce the two modulated carriers substantially in phase across the receiving antenna.