Patent application number | Description | Published |
20100013688 | SIGMA-DELTA TYPE ANALOG-TO-DIGITAL (AD) CONVERTER AND ANGULAR VELOCITY SENSOR USING SAME - An angular velocity sensor with a stable output characteristic using a sigma-delta type analog-to-digital converter comprising an integrator unit for integrating electric charges output from an input switching device and a digital-to-analog converter unit and holding at least two integrated values, a comparator unit for comparing at least the two integrated values output from the integrator unit with a predetermined value, and an arithmetic operation unit for operating an output signal of the comparator unit, the arithmetic operation unit provided with a differential operation unit for computing a difference between at least two comparison signals output from comparator unit. | 01-21-2010 |
20100206069 | PLL CIRCUIT AND ANGULAR VELOCITY SENSOR USING THE SAME - A PLL circuit is provided with an AD converter, a DA converter to which output from the AD converter is inputted, a filter circuit filtering an output signal of the DA converter, a voltage control oscillator outputting a signal of a different frequency in accordance with an output signal from the filter circuit and a frequency divider dividing a signal which the voltage control oscillator outputs. The AD converter operates by a timing signal from the voltage control oscillator and the DA converter outputs an analog signal corresponding to a value which the AD converter outputs by the timing signal outputted from the frequency divider. | 08-19-2010 |
20120111111 | ANGULAR SPEED SENSOR - An angular velocity sensor includes a vibration, first and second sensor electrodes generating an electric charge responsive to an angular velocity applied to the vibration body, first and D/A converters each outputting at least two levels of an electric charge, first and second integrator circuits integrating the electric charge generated by the first and second sensor electrodes and the electric charges output from the first and second D/A converters, respectively, a comparator unit comparing output signals from the first and second integrator circuits, first and second D/A switching units switching levels of the output signals from the first and second D/A converters according to a comparison result of the comparator unit, a first disconnection detecting switch connected between the first sensor electrode and the first integrator circuit, a first voltage source for injecting an electric charge into a point between the first sensor electrode and the first integrator circuit via the first disconnection detecting switch, a second disconnection detecting switch connected between the second sensor electrode and the second integrator circuit, and a second voltage source for injecting an electric charge into a point between the second sensor electrode and the second integrator circuit via the second disconnection detecting switch. This angular velocity sensor has a high reliability and performs stable operation even if ambient environment changes. | 05-10-2012 |
Patent application number | Description | Published |
20090100861 | COMPRESSOR - A stator core of a motor has a plurality of oil return passages extending through one surface and the other surface of the core. On the other surface of the stator core, a hydraulic diameter of each oil return passage is 5 mm or larger, and a ratio of a total area of the oil return passages to an area of a virtual circle having a diameter equal to a maximum outer diameter of the stator core is 5 to 15%. Lubricating oil accumulated on the other surface side of the stator core is returned to an oil reservoir through the oil return passages, and shortage of oil in the oil reservoir is prevented. Furthermore, a cross sectional area of the stator core can be securely kept, and motor efficiency is maintained. | 04-23-2009 |
20090123308 | COMPRESSOR - A compressor has stator of a motor is installed in a closed container, on two planes normal to the center axis | 05-14-2009 |
20090278416 | MOTOR AND COMPRESSOR - Two magnets in a circumferential direction of a rotor are provided in each slot of the rotor. The two magnets are consistently pulled in a direction in which they are mutually separated by magnetism of a stator and fixed on inner surfaces on both sides of the slot in the circumferential direction of the rotor. | 11-12-2009 |
20090285702 | COMPRESSOR - A discharge port of a compression element is positioned inside an outer circumferential surface of a stator, as seen looking in a direction of a rotation axis of a shaft, and overlaps the stator, as seen looking in a direction orthogonal to the rotation axis of the shaft. Accordingly, refrigerant gas discharged from the compression element can be made to flow mainly into spaces inside the outer circumferential surface of the stator. | 11-19-2009 |
20100096945 | INSULATOR FOR MOTOR, STATOR, MOTOR AND COMPRESSOR - An insulator for a motor includes an annular section, a plurality of tooth sections and a plurality of connecting sections. The tooth sections extend radially inward of an inner circumferential surface of the annular section and are circumferentially arranged about the annular section. The connecting sections connect an inner circumferential surface of an annular section to ends of the tooth sections. Each connecting section includes a circumferential planar portion extending circumferentially from the end of a corresponding one of the tooth sections, and a radial planar portion extending radially from the end of the corresponding one of the tooth sections. Preferably, a stator includes a pair of the insulators, a motor includes the stator, and a compressor includes the motor. | 04-22-2010 |
20100296950 | COMPRESSOR - A compressor includes a hermetic container, a compression mechanism section disposed in the hermetic container, and a motor disposed in the hermetic container to drive the compression mechanism section. The motor has a rotor and a stator disposed so as to surround an outer periphery of the rotor. The stator includes a stator core and oil passage grooves. The stator core has a hollow circular cylindrical section and a plurality of circumferentially arranged teeth protruding radially inward from an outer peripheral surface of the hollow circular cylindrical section. The oil passage grooves are located radially outside of the teeth. The oil passage grooves are formed by cutting an outer peripheral surface of the hollow circular cylindrical section. | 11-25-2010 |