Abstract: Heating device includes: heater (2) with heating portion (6) generating heat by energization; housing (4) contains the heating portion and forms passage (18) for a heating medium between the housing and the heating portion; temperature detection means (26) detects, in the passage, temperature (T) inside the housing due to heat of the heating medium and the heating portion; and energization controlling means (40) for turning energization of the heater on/off depending on the temperature detected inside the housing. Energization of the heater is turned off to put the heater in an energization standby state if temperature detected inside the housing is equal to or greater than a first specified threshold (TS1), and is turned off to put the heater in an energization complete stop state if the temperature detected inside the housing in the energization standby state is equal to or greater than a second specified threshold (TS2).

Abstract: The present invention relates to a motor control device provided with the function of detecting the rotor position of a synchronous motor in a sensor-less fashion. The motor control device previously stores a current phase ? defined by the two parameters that are an induced voltage peak value Ep and the subtracted value (?e??i) obtained by subtracting an induced voltage electrical angle ?e from a current electrical angle ?i, and based on the actual detected Ep, ?i, and ?e, selects ? by referring to the ? previously stored, and calculates the rotor position ?m by subtracting the selected ? from the actual detected ?i. Then, in case of selecting ?, the actual detected Ep and ?e are corrected according to changes in the current flowing through the coil. As a result, a detection accuracy for the rotor position during a transition period is enhanced.

Abstract: A motor control device according to the present invention includes: a boost converter circuit 30 that boosts a direct-current voltage; an inverter 40 that generates a drive pulse for a motor 50 from the direct-current voltage of the boost converter circuit 30; and a control section 60 that presets a set value Id_hold obtained by multiplying a set value Id_max by an intermediate current threshold coefficient ?, controls a pulse width of the drive pulse of the inverter 40 based on a speed deviation, controls a d-axis current in the motor 50 based on the speed deviation so that the pulse width of the drive pulse of the inverter 40 does not exceed a threshold value, and controls the direct-current voltage of the boost converter circuit 30 based on the speed deviation so that the d-axis current in the motor 50 does not exceed the set value Id_hold.

Abstract: A valve device for a compressor is improved to suppress noise and a decrease in compressor efficiency caused by pressure pulsations, and also to prevent degradation in compressor performance by ensuring durability. In a valve device of a reed valve structure including: a valve hole 103a or 103b formed in a valve plate 103; a valve seat 103e formed in an outer peripheral portion of the valve hole so as to protrude in a boss shape to a groove 103f formed around an outside thereof; and a valve body 151 having a proximal end 151A connected to the valve plate and a distal end 151B allowed to freely come into and out of contact with a seat surface of the valve seat, a plurality of ribs 103g extend radially from a peripheral wall of the valve seat to an outer peripheral wall of the groove.

Abstract: An applied-voltage electrical angle setting method for a synchronous motor includes detecting applied voltage and current of the synchronous motor M, calculating current peak value Ip based on the detected values while calculating present applied voltage phase ?, calculating target current phase ?targ based on the current peak value Ip followed by calculating target applied voltage phase ?targ corresponding to the target current phase in a target value setting unit 20, and calculating new applied voltage electrical angle instruction value ?vtarg, based on change angle ??v obtained by correcting a difference between the present applied voltage phase ? and the target applied voltage phase ?targ by response time constant L/R of the synchronous motor, rotational speed ? calculated based on the applied voltage and the current, and the previous applied voltage electrical angle instruction value ?vtarg, in a voltage electrical angle instruction value setting unit 10.

Abstract: A unitary-side heat pump unit is configured so that a refrigerant circulates sequentially through a first compressor, a first heat exchanger, a cascade heat exchanger, a first expansion valve and an evaporator, and heat exchange with heat media of a heating unit is carried out in the first heat exchanger; a binary-side heat pump unit is configured so that a refrigerant circulates sequentially through a second compressor, a second heat exchanger, a second expansion valve and a cascade heat exchanger, and heat exchange with heat media of the heating unit is carried out in the second heat exchanger; the refrigerants of the unitary-side and binary-side heat pump units include carbon dioxide (CO2) as a main component; and high pressure-side sections of the unitary-side and binary-side heat pump units are activated within substantially identical pressure ranges of supercritical pressure.

Abstract: A motor control device includes a feed-forward control unit configured to detect a change amount of any one of the target voltage, the applied voltage peak value, and the revolution number difference, which are a monitoring target. The control unit is also configured to manipulate an operation amount of a predetermined operation target on the basis of a magnitude of the change amount to correct the number of revolutions of the motor recognized by a controller.

Abstract: A heat exchanger having a plurality of heat-transfer tubes arrayed at intervals in vertical and anteroposterior directions and arranged so that an equilateral triangle is formed by lines connecting the centers of heat-transfer tubes located vertically and anteroposteriorly adjacent to each other; and a plurality of heat-transfer corrugated fins arranged at intervals in an axial direction of the heat-transfer tubes, characterized in that when an external diameter of each of the heat-transfer tubes is V1; a vertical pitch of the heat-transfer tubes is V2, a fin pitch of the heat-transfer corrugated fins is V3, a fin plate thickness of each of the heat-transfer corrugated fins is V4, and a corrugate height of the heat-transfer corrugated fins is V5, any one of V2, V3 and V5 is set within a given range.

Abstract: There is provided a centrifugal air blower capable of effectively suppressing noise caused by the shapes of a tongue part and a bell mouth formed in a scroll casing. The centrifugal air blower includes: a fan 3 composed of a bottom plate 6 fixed to a rotating shaft, multiple blades 8 whose bases are fixed to the outer circumference of the bottom plate, and an annular rim 9 provided concentrically with the bottom plate to couple distal ends of the blades; a scroll casing 4 for housing the fan and having a suction port 11 on one end side in an axial direction of the rotating shaft; a spiral flow passage 19 formed around the fan in the scroll casing; and a tongue part 16 for suppressing an inflow of air from the end of winding to the beginning of winding of the spiral flow passage.

Abstract: A phase voltage setting unit is configured to define an actual current phase region including a current phase error range based on parameters to which is added an individual difference of at least any one of a motor and an inverter. The phase voltage setting unit defines a stable operation current phase region in which a rotor position can be detected through sensorless control, and sets, as a target current, an electric current obtained by adding a phase difference corresponding to the number of revolutions detected by the revolution number detecting unit to an electric current set by current vector control, such that the actual current phase region is within the stable operation current phase region.

Abstract: According to the present invention, after a predetermined voltage is applied to a coil in a state in which the inside of an electric compressor is filled with dielectric liquid and the coil of a motor is immersed in the dielectric liquid, in a first test process, a test product in which a current value when a first predetermined time T1 elapses I1 is less than or equal to a first reference current value is determined as an acceptable product, in a second test process, among the test products in which the current value is greater than the first reference current value in the first test process, a test product in which a current value I2 when a second predetermined time T2 longer than the first predetermined time elapses is less than or equal to a second reference current value is determined as an acceptable product, a test product in which the current value is greater than the second reference current value is determined as a disqualified product, and the first reference current value is a predictive reference

Abstract: A motor control device capable of executing a start mode that takes into consideration both the start performance with respect to a residual load and the life of a drive circuit is provided. A motor control device for executing a start mode in which a rotor is rotated by forced commutation control: stores a current value at the time when a stop command to a synchronous motor is issued; and decides, when a start command to the synchronous motor is issued after the issuance of the stop command, a target current value based on the stored current value in the start mode in response to the start command.

Abstract: Disclosed is a wobble plate type variable displacement compressor that uses a constant velocity universal joint mechanism, which comprises an inner ring and an outer ring, balls that are held between guide grooves of the inner ring and the outer ring to transmit power, wherein a wobble plate is connected and fixed to the outer ring. In the compressor, the connecting structure for the outer ring and the wobble plate is formed by providing a plurality of concave portions arranged in a circumferential direction on one member, by plastically deforming the other member partially at locations corresponding to the concave portions such that it fits into the concave portions, and by fixing both members to each other in the axial direction and in the rotational direction by means of the plastic deformation.

Abstract: A motor control device that can improve stability of sensorless control of a permanent magnetic synchronous motor. Rotor position detection (10) includes motor parameter correction (30) for correcting a parameter (winding resistance of a coil, a magnetic flux amount of a permanent magnet), which is a machine constant of a motor, in order to eliminate an induced voltage difference between a detected induced voltage peak value and a detected estimated induced voltage peak value. The rotor position is detected on the basis of the corrected parameter.

Abstract: A displacement control system (A) of a variable displacement compressor sets a target for pressure in an intake chamber or a crank chamber, on the basis of a detected evaporator-outlet air temperature and a target for evaporator-outlet air temperature. The pressure of a refrigerant in a high-pressure section is detected, and a regulating current is supplied to a solenoid (316) of a displacement control valve, on the basis of the pressure of the refrigerant in the high-pressure section and the target for pressure.

Abstract: This variable displacement compressor comprises: a housing; a piston; a drive shaft rotatably supported by the housing; a rotor that rotates in unison with the drive shaft; a swash plate that rotates in synchronism with the rotation of the rotor connected via a connecting means; a conversion mechanism that converts the rotation of the swash plate into a reciprocating motion of the piston; and a pressure control valve that is capable of controlling the internal pressure of a crank chamber. The variable displacement compressor is characterized in that: the connecting means directly or indirectly connects a first arm projecting from the rotor and a second arm projecting from the swash plate; and the drive shaft is eccentrically inserted into a through-hole that is perforated through the swash plate.

Abstract: Heating device includes: heater (2) with heating portion (6) generating heat by energization; housing (4) contains the heating portion and forms passage (18) for a heating medium between the housing and the heating portion; temperature detection means (26) detects, in the passage, temperature (T) inside the housing due to heat of the heating medium and the heating portion; and energization controlling means (40) for turning energization of the heater on/off depending on the temperature detected inside the housing. Energization of the heater is turned off to put the heater in an energization standby state if temperature detected inside the housing is equal to or greater than a first specified threshold (TS1), and is turned off to put the heater in an energization complete stop state if the temperature detected inside the housing in the energization standby state is equal to or greater than a second specified threshold (TS2).

Abstract: In order to perform overheating protection of a controller for water-heating heaters 3A and 38 for in-vehicle heating, an energization circuit for a heater 3 (3A, 38) includes IGBTs 11 and 12 as switching devices that are disposed therein to be in series with the heater 3, and a first temperature sensor (first thermistor) 21 which measures temperature of these IGBTs 11,12. A comparator 25 is provided to transmit a signal when the temperature of the IGBTs 11,12 is equal to or greater than a predetermined temperature. Then, the IGBTs 1112 can be forcibly turned OFF via the IGBT driver 13 in response to a signal from the comparator 25 without a microprocessor 14 intervening therebetween.

Abstract: A motor control device has an overcurrent test unit to send a first test voltage Vt1 lower than a reference voltage Vref for overcurrent determination and a second test voltage Vt2 not lower than the reference voltage Vref to an overcurrent determination unit when a synchronous motor is not rotated. The motor control device determines that an abnormality occurs in the overcurrent detection unit when the overcurrent determination unit determines that the first test voltage Vt1 causes an overcurrent on the basis of a comparison result, or the second test voltage Vt2 causes no overcurrent on the basis of the comparison result.

Abstract: In a swash plate type variable capacity compressor that changes a stroke of a piston by controlling the pressure of a crank chamber (6), lubrication oil contained in refrigerant gas is maximally prevented from being circulated outside the compressor. Some of discharged refrigerant gas in a discharge chamber (22) flows into the crank chamber (6) through a communication passage (25) (25a and 25b) and a control valve (27), while some of the discharged refrigerant gas flows out to a suction chamber (21) from the crank chamber (6) through a second communication passage (26) and an orifice (28), and the pressure of the crank chamber (6) is controlled through a balance between an inflow amount and an outflow amount. Oil storage chamber (30) extends downstream of the control valve (27) on the first communication passage (25) to separate oil and store the separated oil. Oil return passage (31) returns the oil stored in the oil storage chamber (30) to the crank chamber (6).