Abstract: A vehicle air conditioning system equipped with a refrigerant circuit comprising an electrically operated compressor is intended to enable simplification of data communication between the inside and outside of a passenger compartment and to enable accurate air conditioning control.

Abstract: An object is to provide an inverter device for an automobile capable of detecting a ground fault with simple circuitry, and in summary, the inverter device has an inverter (inverter module) which generates an AC output from a battery loaded on a vehicle body to drive a motor, and the inverter device comprises a ground fault detection circuit connected between a negative line of the battery and the vehicle body, and a controller, wherein the ground fault detection circuit includes a serial circuit of a resistor element and a condenser element or a serial circuit of a plurality of resistor elements, and a potential at a connection point of the elements is input to the controller to detect a ground fault.

Abstract: An object is to provide a driving device capable of smoothly shifting from a starting state to a sensor-less vector control, in a case where the device drives a motor by the sensor-less vector control, and the device includes a voltage detecting circuit which detects an induced electromotive voltage of the motor. A control circuit starts the motor by rectangular wave control. A magnetic pole position of a rotor is detected based on an induced electromotive voltage of one remaining phase of the motor detected by the voltage detecting circuit. The control circuit controls a main inverter circuit based on the detected magnetic pole position, and accelerates the motor by the rectangular wave control. In a case where a predetermined shift revolution speed is reached, the control circuit shifts to vector control by the sensor-less in which the magnetic pole position detected during the rectangular wave control is used as an initial value.

Abstract: The present invention provides, in case of driving to control a motor for a refrigerant compressor by a sensorless system, a driving device that reduces vibrations and noises at starting, and realizes a smooth connection to the sensorless system. The driving device 22 includes a main inverter circuit 1 that applies quasi three-phase ac voltages to and drives the motor 21 for driving the refrigerant electric compressor forming a refrigerant circuit, current sensors 6V and 6W that detect the currents flown into the motor, and a control circuit 23 that executes driving and controlling by the sensorless system on the basis of the outputs from the current sensors.

Abstract: An object is to provide a driving device capable of smoothly shifting from a starting state to a sensor-less vector control, in a case where the device drives a motor by the sensor-less vector control, and the device includes a voltage detecting circuit which detects an induced electromotive voltage of the motor. A control circuit starts the motor by rectangular wave control. A magnetic pole position of a rotor is detected based on an induced electromotive voltage of one remaining phase of the motor detected by the voltage detecting circuit. The control circuit controls a main inverter circuit based on the detected magnetic pole position, and accelerates the motor by the rectangular wave control. In a case where a predetermined shift revolution speed is reached, the control circuit shifts to vector control by the sensor-less in which the magnetic pole position detected during the rectangular wave control is used as an initial value.

Abstract: A numerical controller capable of displaying a CNC frame and an application frame at the same time without switching between them. Software A for displaying the information of the numerical controller itself performs display processing and stores the video signal data of the CNC frame AS in storage means as bit map data at given update intervals. Display software B in application performs the display processing of the application, generates the video signal data of an application frame BS, synthesizes this bit map with the bit map of the CNC frame AS which is stored in the storage means, transfers the composite image data to the display, and displays a frame in which the CNC frame AS is displayed in the application frame BS. Since the application frame BS and the CNC frame AS are displayed at the same time, it is possible to monitor the two frames, to operate the keys, and the like, which improves the operation.

Abstract: An object is to provide an inverter device capable of realizing exact protection of the winding of a motor. An inverter device for generating a pseudo alternating current by switching a direct current to drive a motor, comprises a controller that executes vector control on the basis of a secondary current applied to the motor. The controller calculates a current density from the secondary current to execute a predetermined protection operation on the basis of the calculated current density. The controller imposes a restriction on the operation frequency of the motor on the basis of the current density.

Abstract: For a purpose of realizing a refrigerant cycle apparatus capable of exactly detecting a pressure reverse phenomenon caused in a compression element of a compressor of a multistage compression type, in the refrigerant cycle apparatus in which the multistage compression type compressor constitutes a refrigerant circuit, including an electromotive element, and first and second compression elements driven by the electromotive element in an airtight container to suck an intermediate-pressure refrigerant gas compressed by the first compression element into the second compression element and to compress and discharge the refrigerant gas, the apparatus comprising: a sensor for detecting a discharge refrigerant pressure of the first compression element; and a control device into which an output of the sensor is input, the control device detects reverse of the discharge refrigerant pressures of the first and second compression elements based on the discharge refrigerant pressure of the first compression element.

Abstract: An object is to provide an inverter device by which a diode for a countermeasure against reverse connection of a direct-current power supply can be abolished, the inverter device has a constitution in which a switching unit is connected between a battery constituting the direct-current power supply and an inverter main circuit, the device comprises: a voltage detection circuit which detects a voltage of a previous stage of the switching unit; a control unit which controls the switching unit; and a voltage input circuit which inputs into the control unit the voltage detected by the voltage detection circuit, and the control unit prohibits a closed circuit of the switching unit in a case where the voltage input from the voltage input circuit indicates a predetermined abnormal value.

Abstract: An object is to provide an inverter device for an automobile capable of detecting a ground fault with simple circuitry, and in summary, the inverter device has an inverter (inverter module) which generates an AC output from a battery loaded on a vehicle body to drive a motor, and the inverter device comprises a ground fault detection circuit connected between a negative line of the battery and the vehicle body, and a controller, wherein the ground fault detection circuit includes a serial circuit of a resistor element and a condenser element or a serial circuit of a plurality of resistor elements, and a potential at a connection point of the elements is input to the controller to detect a ground fault.

Abstract: An object is to provide a vehicle air conditioner which can protect an inverter for an electrically driven compressor by opening a switching device for air conditioning when an abnormality occurs in circuits on a vehicle side and which can protect the circuits on the vehicle side by opening the switching device for air conditioning when an abnormality occurs at the inverter for an electrically driven compressor. In summary, the vehicle air conditioner comprises a condenser for air conditioning which is charged from an in-vehicle battery via the charging device, and an inverter for an electrically operated compressor for air conditioning which is supplied with electric power from the in-vehicle battery via the switching device. In the vehicle air conditioner, a switching device for air conditioning is provided between the condenser for air conditioning and the inverter for an electrically operated compressor.

Abstract: A vehicle air conditioning system equipped with a refrigerant circuit comprising an electrically operated compressor is intended to enable simplification of data communication between the inside and outside of a passenger compartment and to enable accurate air conditioning control.

Abstract: An object is to provide an inverter device capable of realizing exact protection of the winding of a motor. An inverter device for generating a pseudo alternating current by switching a direct current to drive a motor, comprises a controller that executes vector control on the basis of a secondary current applied to the motor. The controller calculates a current density from the secondary current to execute a predetermined protection operation on the basis of the calculated current density. The controller imposes a restriction on the operation frequency of the motor on the basis of the current density.

Abstract: For a purpose of realizing a refrigerant cycle apparatus capable of exactly detecting a pressure reverse phenomenon caused in a compression element of a compressor of a multistage compression type, in the refrigerant cycle apparatus in which the multistage compression type compressor constitutes a refrigerant circuit, including an electromotive element, and first and second compression elements driven by the electromotive element in an airtight container to suck an intermediate-pressure refrigerant gas compressed by the first compression element into the second compression element and to compress and discharge the refrigerant gas, the apparatus comprising: a sensor for detecting a discharge refrigerant pressure of the first compression element; and a control device into which an output of the sensor is input, the control device detects reverse of the discharge refrigerant pressures of the first and second compression elements based on the discharge refrigerant pressure of the first compression element.

Abstract: There is provided an automotive air conditioning system, which is free from troubles in traveling itself caused by power consumption in air conditioning means in an automobile having storage means, power generation means for charging the storage means, and air conditioning means having an electric compressor driven by feeding from the storage means.

Abstract: There is provided an automotive air conditioning system, which is free from troubles in traveling itself caused by power consumption in air conditioning means in an automobile having storage means, power generation means for charging the storage means, and air conditioning means having an electric compressor driven by feeding from the storage means.

Abstract: An air conditioning system comprises a heat source side machine, a plurality of user side machines more than half of which are disposed below the heat source side machine, and liquid phase and gas phase pipes connecting the heat source side machine with the user side machines to form a closed circuit. A phase-changeable fluid included in the closed circuit circulates by utilizing its own specific gravity difference between the liquid and gas phases, so that each of the user side machines can perform cooling and heating operations. The liquid phase pipe and the gas phase pipe can communicate with each other via a gas bypass circuit and/or a liquid bypass circuit including a open-close valve and liquid level detection means, so that bubbles or condensed liquid generated in the closed circuit can be exhausted quickly.

Abstract: In an air conditioning system for circulating a fluid which can change a phase between a gas phase and a liquid phase by a difference of a specific gravity between the gas phase and the liquid phase between an heat source side machine and a plurality of user side machines more than half of which are disposed below the heat source side machine, so that each of the user side machines performs a cooling operation, each of the user side machines is provided with a heat exchanger, a flow control valve for controlling a volume of said fluid supplied to the heat exchanger, a blow means for supplying an air-conditioned air to a room through the heat exchanger, a physical value detecting means for detecting a physical value relating to an air conditioning load such as a temperature and a signal controlling means for the operating and detecting portions, and wherein the heat source side machine is provided with a control means for communicating with said signal controlling means and outputting a control signal to said

Abstract: An air conditioning system comprises a heat source side machine such as an absorption type refrigerator, a plurality of user side machines more than half of which are disposed below the heat source side machine, and liquid phase and gas phase pipes connecting the heat source side machine with the user side machines to form a closed circuit. A phase-changeable fluid circulates between the heat source side machine and the user side machines by utilizing its own specific gravity difference between the liquid and gas phases and a driving force of an electric pump provided to the liquid phase pipe, so that each of the user side machines can perform cooling operation. A receiver tank is provided to the inlet side of the electric pump, and an upper portion of the receiver tank is connected to the gas phase pipe by a pressure-equalizing pipe so as to improve a start characteristic of the cooling operation.

Abstract: In an air conditioning system comprising a heat source side machine for condensing a fluid which can change a phase between a liquid phase and a gas phase to a predetermined temperature and for supplying, and a plurality of user side machines more than half of which are disposed below said heat source side machine, in which piping is constructed in such a manner as to circulate the fluid supplied from said heat source side machine by using a difference in specific gravity between the liquid phase and the gas phase, between said heat source side machine and said user side machine and a cooling of said user side machine is performed by evaporating said fluid in said user side machine, the heat source side machine is provided with a control means for descending a set temperature of said fluid discharged from said heat source side machine after condensed by changing the operating capacity of said heat source side machine when a state that the temperature of said fluid returned back after evaporated in the user si