Abstract: A refrigerant circuit includes a compressor, an outdoor heat exchanger, a throttle device, an indoor heat exchanger, and a four-way valve, and it is configured such that refrigerant circulates therethrough. An inverter is configured to control the compressor as being variable in speed. The refrigerant circuit is configured to perform a defrosting operation in which refrigerant discharged from the compressor is introduced into the outdoor heat exchanger. The compressor includes a motor. The inverter has, as an operation mode, a speed control mode in which the motor is controlled such that a rotation speed thereof is closer to a rotation speed corresponding to a command value and an output control mode in which the rotation speed of the motor is controlled such that output from the motor is closer to a target value. The inverter is configured to operate by using the output control mode in the defrosting operation.

Abstract: A power conversion device supplies power to a load. The power conversion device includes a power conversion unit, a control unit, a noise suppression unit, and an error detection unit. The power conversion unit receives power from a first power source. The control unit controls the power conversion unit. The noise suppression unit is connected between the first power source and the power conversion unit and outputs a noise suppression signal to suppress noise generated from the power conversion unit. When an error condition is established, the error detection unit detects an error. The error condition indicates that the error has occurred in the power conversion device or the load. The error condition includes a condition that an amount of noise generated from the power conversion unit is larger than a reference value.

Abstract: A failure diagnosis apparatus includes a controller to control drive of a motor, a wear estimator to estimate an amount of wear of a bearing of the motor based on a current that flows in the motor, and a failure notification unit to diagnose a failure of the motor based on the amount of wear of the bearing of the motor estimated by the wear estimator and to notify a user. When the wear estimator estimates the amount of wear of the bearing of the motor, the controller controls drive of the motor such that the motor is driven in a constant state.

Abstract: A refrigerating and air-conditioning apparatus that performs defrosting operation, the refrigerating and air-conditioning apparatus including: a refrigerant circuit in which a compressor, a first heat exchanger, an expansion device, a second heat exchanger, and a four-way valve are connected to each other by pipes to allow refrigerant to circulate through the refrigerant circuit; a temperature sensor configured to measure a temperature of the compressor; and a heat generation control unit configured to increase a temperature of the compressor when the heat generation control unit detects a decrease in a value measured by the temperature sensor in defrosting operation performed on the first heat exchanger.

Abstract: A direct-current power supply apparatus includes a rectifier circuit that rectifies a power-supply voltage output from an alternating-current power supply, a smoothing capacitor that smooths an output voltage of the rectifier circuit and outputs a direct-current voltage, a switch connected between an output side of the rectifier circuit and an input side of the smoothing capacitor, a zero crossing detector that detects a zero crossing point of the power-supply voltage, and a controller. The controller includes an adjustment circuitry that sets a switching period such that timing of an on switching operation of the switch falls between a zero crossing period that is a period for the zero crossing point detected by the zero crossing detector, and a zero crossing average period, and a switch control circuitry that outputs an on signal to the switch in accordance with the switching period set by the adjustment circuitry.

Abstract: a permanent magnet synchronous motor diagnostic device includes: a negative-sequence current calculator that calculates a negative-sequence current, based on magnitudes of a plurality of phase currents flowing through a permanent magnet synchronous motor that rotates a load; and a deterioration diagnoser that diagnoses deterioration of a plain bearing supporting the permanent magnet synchronous motor, based on the negative-sequence current.

Abstract: A failure prediction device that predicts a failure of a bearing of a compressor mounted on an air-conditioner, the failure prediction device including an observation unit that acquires, as state variables, a first state variable indicating a state of a motor and a second state variable indicating a state of an electrical device, a conversion unit that converts the state variables into a frequency domain, a generation unit that generates failure information on a failure of the bearing using frequency characteristics of the state variables obtained by converting the state variables into the frequency domain by the conversion unit and a learned model representing a relationship between the frequency characteristics of the state variables and model failure information on the failure of the bearing, and an output unit based on the failure information generated by the generation unit.

Abstract: A power converter that includes a rectifier rectifying a voltage supplied from a three-phase AC power supply, a voltage step-down circuit including a voltage step-down switching element, a reactor, a backflow prevention element, and a smoothing capacitor and stepping down a DC voltage supplied from the rectifier, and an inverter circuit converting the DC voltage smoothed by the smoothing capacitor into an AC voltage. The power converter includes an imbalance determining unit determining, based on states of the voltage step-down circuit and the smoothing capacitor, whether or not voltage imbalance has occurred in the three-phase AC power supply and a voltage step-down control unit performing switching of the voltage step-down switching element in a case where the imbalance determining unit determines that the voltage imbalance has occurred.

Abstract: A power converter that includes a rectifier rectifying a voltage supplied from a three-phase AC power supply, a voltage step-down circuit including a voltage step-down switching element, a reactor, a backflow prevention element, and a smoothing capacitor and stepping down a DC voltage supplied from the rectifier, and an inverter circuit converting the DC voltage smoothed by the smoothing capacitor into an AC voltage. The power converter includes an imbalance determining unit determining, based on states of the voltage step-down circuit and the smoothing capacitor, whether or not voltage imbalance has occurred in the three-phase AC power supply and a voltage step-down control unit performing switching of the voltage step-down switching element in a case where the imbalance determining unit determines that the voltage imbalance has occurred.

Abstract: In a pump, a resin magnet included in a rotor portion has a plurality of groove portions in an outer peripheral portion thereof, the groove portions extending in an axial direction.

Abstract: A rotor of an electric motor configured by combining a resin magnet section molded of thermoplastic resin containing ferrite and a rotation shaft includes a magnetic section for position detection integrally formed of the thermoplastic resin on an end face on one side of the resin magnet section, the thermoplastic resin being injected from an inner diameter side of the resin magnet section to the end face. Because the position of the rotor can be detected by the magnetic section without using a magnet for position detection, cost reduction can be achieved while the accuracy of detecting the position of the rotor is ensured.

Abstract: A stator for an electric motor includes a substrate, sensor leads and power leads connected to the substrate, and a lead wiring part that retains the substrate and routes the sensor leads and the power leads. The substrate has a Hall IC that is a position detection circuit for a rotor mounted thereon, and a hole for inserting a terminal provided in a board-in connector formed therein. The substrate is retained only by the lead wiring part, and the sensor leads and the power leads are retained by the lead wiring part.

Abstract: A resin magnet, a magnetic pole position detection resin magnet, and a sleeve bearing, which is disposed inside the resin magnet, are integrally molded together with a thermoplastic resin in a rotor portion. At the same time, an impeller attachment portion is formed by the thermoplastic resin.

Abstract: A stator for an electric motor includes: a stator core that includes a plurality of teeth on which insulating portions are provided; and a coil formed by winding a wire around each of the teeth. A lead-in opening and a lead-out opening are formed in insulating portions provided on an outside diameter side of the stator core. The lead-in opening leads in a crossover wire of the coil routed to an outer peripheral side of the insulating portions to the side of the teeth. The lead-out opening leads out the crossover wire of the coil from the side of the teeth to the outer peripheral side of the insulating portions. The length from an axial end portion of the stator core on an insulating portion side to the lead-in opening is different from the length from the axial end portion to the lead-out opening.

Abstract: The present invention is a molded stator including a stator and a substrate. The molded stator includes: a donut-shaped lead-wire wiring component that wires power-supply lead wires to a winding wire of the stator and that wires sensor lead wires to the position detection circuit; a lead-out component that leads out the power-supply lead wires and the sensor lead wires to outside of the molded stator; a power-supply lead-wire holding component that holds the power-supply lead wires; and a sensor-lead-wire holding component that holds the sensor lead wires. The lead-out component is connected to a latching part that latches the sensor-lead-wire holding component and includes projections as plane parts that are substantially perpendicular to a radial direction of the stator on the radially outer side.

Abstract: The present invention includes a stator; a substrate on which a position detection circuit for a rotor is mounted; a lead wiring part attached to one axial end of the stator and routing a sensor lead to the position detection circuit; and a housing connected to an end of the sensor lead. The substrate is attached to a first surface side of the lead wiring part, and the housing is disposed at a position that is opposed to a position at which the substrate is attached and that is on a second surface side of the lead wiring part, and the lead wiring part includes a housing contact portion provided between the position at which the substrate is attached and the position at which the housing is disposed.

Abstract: To provide an electric-motor rotor including a cylindrical yoke, a resin magnet portion that is formed from resin magnet integrally with the outer periphery of the yoke, a position-detecting magnet that is located on one axial-end side of the resin magnet portion, a plurality of seats that are formed on the axial end surface of the yoke on the side of the position-detecting magnet, each of which includes a pair of protruding portions, and an opening formed between the protruding portions, and a seat connecting portion that is formed with the seats on its top surface, wherein a ribbed runner that supplies the resin magnet to the resin magnet portion through the opening is provided at the opening to form, along with the seat, a seat portion that places thereon the position-detecting magnet.

Abstract: A stator includes: a sensor substrate attached to one end of a stator core in an axial direction of the stator core, the sensor substrate being provided with a bearing through hole and being provided with a notch on a periphery, the notch being used for leading out a power supply lead and a sensor lead; a sensor-lead board-in connector disposed between the bearing through hole and the notch on the surface of the sensor substrate on the counter-stator side, the sensor lead being connected to the sensor-lead board-in connector; and a power-supply-lead board-in connector disposed on the surface of the sensor substrate on the counter-stator side such that the power-supply-lead board-in connector faces the sensor-lead board-in connector with the bearing through hole therebetween, the power supply lead being connected to the power-supply-lead board-in connector.

Abstract: A power-supply-lead retaining part includes a pair of legs extending toward a bearing through hole, a pair of first locking portions provided on the pair of legs and locked to the edge portion of the bearing through hole, and a pair of second locking portions locked to the edge portion of the sensor substrate on both sides of a notch.

Abstract: In a pump, at least one of leg portions of a pilot hole component are extended by a specified distance compared to the other leg portions toward a side opposite to a surface where pilot holes are exposed, and the pilot holes formed in the some leg portions extend through the some leg portions between end planes of the some leg portions and are exposed in the other end plane of the molded stator, the other end plane located at the other end in the axial direction.