A transport refrigeration system includes a compressor, condenser and evaporator; an inverter providing a multiphase, AC output voltage to the compressor; and a DC power system having an output coupled to the inverter, the DC power system including: a primary power source; a DC-AC converter connected to the primary power source; a transformer connected to the DC-AC converter; an AC-DC converter connected to the transformer, the AC-DC converter outputting a primary DC voltage; a secondary power source; and a DC-DC converter connected to the secondary power source, the DC-DC converter outputting a secondary DC voltage; a combination of the primary DC voltage and the secondary DC voltage provides the output of the DC power system.

Certain example embodiments provide a vapor compression refrigeration system, comprising: a compressor configured to suction refrigerant at a low pressure and temperature from a suction return, compress the refrigerant, and output refrigerant at a higher pressure and temperature; a condenser configured to cool refrigerant received from the compressor as the refrigerant passes though coils in the condenser; an expansion device configured to reduce the pressure of the refrigerant received from the condenser; and an evaporator configured to allow the refrigerant received from the expansion device to absorb heat surrounding the evaporator. The system may include a plurality of sensors configured to measure temperature of the system and a controller configured to control, based on the signals from one or more sensors, operation of the compressor and/or an evaporator fan motor configured to allow the refrigerant received from the expansion device to absorb heat surrounding the evaporator.

According to one embodiment, this outdoor unit of an air conditioner includes a compressor, a heat exchanger, an expansion valve, a blower fan, electrical components, and a heat sink. The heat exchanger includes a first group constituted of at least one of the plurality of heat exchangers and a second group constituted of at least one of the plurality of heat exchangers not belonging to the first group. The expansion valve includes a first expansion valve and a second expansion valve. The heat sink is arranged on the flow path of the refrigerant on the upstream side of a confluence position of the refrigerant branches condensed by the heat exchangers of the first group and the second group and on the downstream side of the second expansion valve.

An inverter of a motor-driven compressor includes a circuit board on which an electronic component is mounted. The housing includes a motor housing member that defines a suction chamber, an inverter housing member that defines an inverter accommodating chamber, and a partition wall that separates the suction chamber and the inverter accommodating chamber from each other. The electronic component includes a main body that acts to remove noise. The circuit board faces the partition wall. The main body faces an outer peripheral surface of the motor housing member in a radial direction of the rotary shaft. A projected area of the main body onto the circuit board in the axial direction is smaller than a projected area of the main body onto the outer peripheral surface of the motor housing member in the radial direction.

An object is to inhibit disproportionation reactions that may occur while a refrigerant having a low GWP is used. A freezing apparatus of the present disclosure includes: a compressor, a condenser, an expansion mechanism, and an evaporator. In the freezing apparatus, a working medium containing an ethylene-based fluoroolefin is used as a refrigerant. The compressor includes a suction part that sucks in the working medium, a compression mechanism that compresses the working medium sucked through the suction part, and a refrigerant supply part that supplies the working medium to the compression mechanism via a path different from the suction part. The compressor is an internal low pressure compressor in which the compression mechanism, together with an electric motor, is accommodated in a container, so that the compression mechanism sucks and compresses the working medium present in the container.

The present disclosure provides a motor control device that realizes a drive signal for each phase in a three-phase modulation control system with an analog circuit. The motor control device includes a generator, a modulation unit and inverting unit. The generator is configured to receive an input voltage and generate an analog voltage having a crest value corresponding to the input voltage and having a reference potential or higher. The modulation unit is configured to generate a PWM voltage based on the analog voltage output from the generation unit. The inverting unit is configured to invert a duty in a predetermined period of the PWM voltage.

The present invention relates to a vehicular air conditioning system and provides a vehicular air conditioning system capable of preventing overheating of an inverter that controls the rotation speed of an electric compressor without cutting off the inverter, and consequently preventing the stoppage of an air conditioner due to the cut-off of the inverter and the resultant stoppage of cooling of a passenger room. The vehicular air conditioning system includes an electric compressor, an inverter configured to control a rotation speed of the electric compressor, and a control part configured to execute control so that a refrigerant flow rate on an inlet side of the electric compressor increases when a temperature of the inverter is equal to or higher than a preset overheating warning temperature.

A heating, ventilation, air conditioning, and refrigeration (HVAC&R) system includes a compressor having a housing, a shaft disposed within and extending through the housing, and an impeller coupled to the shaft, where the shaft is configured to rotate relative to the housing and about an axis to rotate the impeller. The HVAC&R system also includes a controller configured to receive data indicative of a distance from a shroud of the impeller to the housing and to adjust a position of the shaft along the axis based on a comparison of the distance from the shroud of the impeller to the housing with a predetermined value.

Provided are an operation recording system, a vehicle, an operation recording method and an operation recording program which make it possible to perform an abnormality analysis of a highly accurate compressor. An operation recording system to be used in an electric compressor of a vehicle air-conditioning system equipped with an inverter circuit (50), said system being equipped with: an acquisition unit for acquiring, as abnormality reference information, at least one type of information from among temperature information at a prescribed position in the inverter circuit (50). voltage information at a prescribed position in the inverter circuit (50) and electric current information at a prescribed position in the inverter circuit (50); and a recording processing unit for recording the abnormality reference information and time information which can be associated with said abnormality reference information in a prescribed recording unit.

A recreational vehicle air conditioning system supports multiple recreational vehicle air conditioning units having closed air conditioning circuits and a controller that is electronically coupled to each of the recreational vehicle air conditioning units to control each of the closed air conditioning circuits to regulate an overall power consumption of the multiple recreational vehicle air conditioning units. A recreational vehicle air conditioning system may also support multiple recreational vehicle air conditioning units where a refrigerant line set is coupled between the recreational vehicle air conditioning units such that a compressor in one of the recreational vehicle air conditioning units is capable of supplying refrigerant to the evaporators of the multiple recreational vehicle air conditioning units, and such that valves coupled in series with each of the evaporators may be regulated to control cooling by each recreational vehicle air conditioning unit.