Abstract: A method of magnetizing a rotor of a motor including the rotor made of an integrated magnet member and a stator is provided. Predetermined magnetic fields are preliminarily applied to the rotor to form magnetic paths and thereafter, the rotor is demagnetized. Then, the rotor is assembled into the stator. The rotor and stator are positioned such that the directions of the magnetic fields which are generated from the stator winding of the stator coincide with the directions of the magnetic paths of the rotor. Subsequently, in the state in which both of the rotor and stator are positioned, a current is supplied to the stator winding and the magnetic fields are generated, thereby magnetizing the rotor by the magnetic fields.

Abstract: An inverting apparatus comprises: a capacitor input type rectifying circuit consisting of a full-wave rectifier and a smoothing capacitor; a single-phase bridge inverter having four semiconductor switches; and a driving control unit for opening and closing the semiconductor switches, wherein the smoothing capacitor is provided with a switch to open and close the smoothing capacitor.

Abstract: A tablet type coordinate input apparatus comprises a flat medium for propagating a longitudinal elastic wave, longitudinal elastic wave detecting elements disposed on part of the end-adjacent side surfaces or of the front surface of the flat medium, a longitudinal elastic wave input member having an end portion terminating in a sharp-pointed end and brought into pressure engagement at that end with any desired position on the surface of the flat medium to radiate the longitudinal elastic wave from that end, an amplifier circuit amplifying electrical signals indicative of the elastic wave detected by the detecting elements, a comparator circuit comparing the signals amplified by the amplifier circuit with a predetermined threshold voltage thereby generating delay pulse signals corresponding to the propagation times of the longitudinal elastic wave, a counter circuit counting the lengths of time elapsed from the time of radiation of the longitudinal elastic wave toward the flat medium as a result of pressure en

Abstract: The present invention continuously speed-controls an electric motor for driving a compressor for refrigerant compression such that the compressor is driven in its maximum rpm if the difference (temperature deviation) between a target cooling temperature and an actual temperature is greater than a first predetermined value, the compressor is stopped if the temperature deviation is less than a second predetermined value, and the compressor is speed-controlled by a digital control signal if the temperature deviation is between said first and second predetermined values.

Abstract: A robot operation control system for point-to-point movement is disclosed in which each motor is provided with a microcomputer and a predetermined acceleration/deceleration control is effected for each microcomputer, so that specified given points may be passed smoothly in a given sequence.

Abstract: A novel refrigerator control system is disclosed which comprises an inverter for driving a motor for a compressor, and a change-over device for driving the compressor directly with a commercial power supply when the compressor motor is not driven by the inverter.

Abstract: A method of manufacturing a fan guard from a plate member wherein inward slits, each having at least a radial slit section are formed in a first section of the plate member located between a central section and a ring-like section radially outwardly spaced therefrom of the plate member such that the radial slit sections extend from the central section to the ring-like section in circumferentially spaced relation to each other. Radially outward slits, each having at least an arcuate slit section, are formed in a second section of the plate member located between the ring-like section and an outer peripheral section of the plate member such that the arcuate slit sections extend from the ring-like section to the outer peripheral section in circumferentially spaced relation to other. Portions each extending between the adjacent two radial slit sections are bent to form louvers.

Abstract: A refrigeration evaporator includes a serpentine refrigerant tube having a plurality of finned straight portions connected by unfinned U-shaped connecting portions to form a stacked assembly of side-by-side finned tube arrays. The fins are rectangular and are provided with a J-shaped cut-out at each corner. The J-shaped cut-outs at confronting corners of the fins of each immediately adjacent pair of finned tube arrays define a U-shaped heater receiving space extending the length of the arrays and which clampingly receives an elongated straight portion of a serpentine electric defroster heater in good heat conductive contact with each fin of the immediately adjacent pair of finned tube arrays. Each fin of the stacked assembly has at least two corners in engagement with the heater. The stacked assembly is disposed transversely in a duct having an air inlet and air outlet.

Abstract: A humidity control apparatus characterized in that a dehumidifying mechanism, which comprises a refrigeration circuit composed of a compressor, a condenser, a decompression device, and an evaporator, a fan for drawing in air past the circuit, and a tank for collecting and storing the moisture in the condensed form, is combined with a humidifying mechanism comprising an intake duct into which part of the air current is bypassed, taking advantage of the dynamic pressure exerted by the fan, ultrasonic humidifying-vapor generator means wherein the air from the intake duct is mixed with water vapor, and a discharge duct through which the air-vapor mixture is discharged to the outside, said generator means being supplied with water from said tank.

Abstract: In a control system for a brushless motor comprising a power source, a plurality of driving coils and contactless switching elements for intermittently supplying voltage across the power source to the driving coils in response to rotor position signals, rotor position signals are chopped by a chopping signal in which a ratio of a high level period to a low level period can be changed, and a portion of the contactless switching elements is driven by the chopped rotor position signals, thereby controlling the rotating speed of the brushless motor.

Abstract: A control system for an air conditioner having detectors for detecting at least the radiation temperature in a room or controlled space, a device for setting a desired room air parameter in response to the detected radiation temperature, and a controller for controlling the air conditioner in accordance with the desired room air parameter.