Abstract: An electric motor device includes an electric motor, an inverter, a noise reducer, a control unit, and a metal housing. The controller controls switching elements using a PWM signal generated from a voltage instruction value and a carrier frequency. The control unit includes a calculation portion that calculates a modulation factor of the voltage instruction value and a setting portion that sets the carrier frequency in accordance with the modulation factor. The carrier frequency set by the setting portion is higher when the modulation factor is less than a predetermined modulation factor than when the modulation factor is greater than or equal to the predetermined modulation factor.

Abstract: An electric motor includes processing circuitry. The processing circuitry is configured to superpose a harmonic on at least one of instruction values, and estimate the position of a rotor by a harmonic superposition method based on the harmonic superposed on the at least one of instruction values. The frequency of a harmonic includes a first frequency and a second frequency that is lower than the first frequency. The processing circuitry is further configured to determine whether a temperature-associated value becomes greater than a threshold value. When the temperature-associated value becomes greater than the threshold value, the processing circuitry is further configured to set the frequency of the harmonic for superposition on the at least one of instruction values to the second frequency.

Abstract: An electric motor includes processing circuitry. The processing circuitry estimates the position of a rotor in a mode selected from an induced voltage mode and a harmonic superimposition mode. The induced voltage mode is a mode of estimating the position of the rotor based on an induced voltage that is generated in three-phase coils. The harmonic superimposition mode is a mode of estimating the position of the rotor by superimposing a harmonic on a command value. The processing circuitry estimates the position of the rotor using the induced voltage mode when the output voltage is greater than or equal to a predetermined threshold value and estimates the position of the rotor using the harmonic superimposition mode when the output voltage is less than the threshold value.

Abstract: An electric motor includes processing circuitry estimates a position of a rotor in a mode selected from an induced voltage mode and a harmonic superimposition mode. The processing circuitry estimates the position of the rotor using the induced voltage mode when the input voltage is less than or equal to a predetermined voltage threshold value or when the phase current is greater than or equal to a predetermined current threshold value and estimates the position of the rotor using the harmonic superimposition mode when the input voltage is greater than the voltage threshold value and the phase current is less than the current threshold value.

Abstract: The solid electrolyte material of the present disclosure comprises lithium and a plurality of anion elements. The plurality of anion elements comprises a pnictogen element, a chalcogen element, and a halogen element. The pnictogen element includes at least one selected from the group consisting of N, P, As, Sb, and Bi, the chalcogen element is at least one selected from the group consisting of S, Se, and Te, and the halogen element is at least one selected from the group consisting of Br and I. The battery of the present disclosure comprises a positive electrode, a negative electrode, and an electrolyte layer provided between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer comprises the solid electrolyte material of the present disclosure.

Abstract: An electric motor includes processing circuitry. The processing circuitry estimates the position of a rotor in a mode selected from an induced voltage mode and a harmonic superimposition mode. The induced voltage mode is a mode of estimating the position of the rotor based on an induced voltage that is generated in three-phase coils. The harmonic superimposition mode is a mode of estimating the position of the rotor by superimposing a harmonic on a command value. The processing circuitry estimates the position of the rotor using the induced voltage mode when the output voltage is greater than or equal to a predetermined threshold value and estimates the position of the rotor using the harmonic superimposition mode when the output voltage is less than the threshold value.

Abstract: An electric motor includes processing circuitry estimates a position of a rotor in a mode selected from an induced voltage mode and a harmonic superimposition mode. The processing circuitry estimates the position of the rotor using the induced voltage mode when the input voltage is less than or equal to a predetermined voltage threshold value or when the phase current is greater than or equal to a predetermined current threshold value and estimates the position of the rotor using the harmonic superimposition mode when the input voltage is greater than the voltage threshold value and the phase current is less than the current threshold value.

Abstract: The solid electrolyte material of the present disclosure comprises a crystal phase comprising Li, Mg, and X. Here, X is at least one selected from the group consisting of F, Cl, Br, and I, and the crystal phase has a crystal structure belonging to the space group Fm-3m. The battery of the present disclosure comprises a positive electrode, a negative electrode, and an electrolyte layer disposed between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer comprises the solid electrolyte material of the present disclosure.

Abstract: The solid electrolyte material of the present disclosure comprises lithium and a plurality of anion elements. The plurality of anion elements includes antimony and at least one element selected from the group consisting of pnictogen elements excluding antimony, chalcogen elements, and halogen elements. The battery of the present disclosure comprises a positive electrode, a negative electrode, and an electrolyte layer disposed between the positive electrode and the negative electrode, wherein at least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer contains the solid electrolyte material of the present disclosure.

Abstract: An electric motor device includes an electric motor, an inverter, a noise reducer, a control unit, and a metal housing. The controller controls switching elements using a PWM signal generated from a voltage instruction value and a carrier frequency. The control unit includes a calculation portion that calculates a modulation factor of the voltage instruction value and a setting portion that sets the carrier frequency in accordance with the modulation factor. The carrier frequency set by the setting portion is higher when the modulation factor is less than a predetermined modulation factor than when the modulation factor is greater than or equal to the predetermined modulation factor.

Abstract: The solid electrolyte material of the present disclosure includes Li, La, O, X, and a hydride. X is at least one selected from the group consisting of F, Cl, Br, and I. The battery of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer. The electrolyte layer is disposed between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer contains the solid electrolyte material of the present disclosure.

Abstract: The solid electrolyte material of the present disclosure consists of Li, La, O, and I. The battery of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer. The electrolyte layer is disposed between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer contains the solid electrolyte material of the present disclosure.

Abstract: A controller uses a differential pressure between a discharge pressure and a suction pressure to estimate an execution time of braking control needed to fix a position of a rotor at a specific angle. Further, the controller executes the braking control by the estimated execution time. This prevents the controller from unnecessarily continuing to execute the braking control.

Abstract: The motor-driven compressor includes an electric motor, a housing, a compression portion, and an inverter device. The inverter device includes an inverter circuit, a current sensor, a coordinate converter, a speed controller, a current controller, a PWM controller, and a rotation angle estimator. The speed controller generates a d-axis current command value and a q-axis current command value such that a necessary torque to drive the electric motor occurs. The inverter device includes a heat-generating current command section that increases a temperature of the electric motor by changing the d-axis current command value and the q-axis current command value. The heat-generating current command section changes the d-axis current command value and the q-axis current command value so as to shift them in a direction in which a d-axis current value increases along a constant torque curve in a d-q coordinate system.

Abstract: The motor-driven compressor includes an electric motor, a housing, a compression portion, and an inverter device. The inverter device includes an inverter circuit, a current sensor, a coordinate converter, a speed controller, a current controller, a PWM controller, and a rotation angle estimator. The speed controller generates a d-axis current command value and a q-axis current command value such that a necessary torque to drive the electric motor occurs. The inverter device includes a heat-generating current command section that increases a temperature of the electric motor by changing the d-axis current command value and the q-axis current command value. The heat-generating current command section changes the d-axis current command value and the q-axis current command value so as to shift them in a direction in which a d-axis current value increases along a constant torque curve in a d-q coordinate system.

Abstract: A motor drive device drives a multi-phase synchronous motor in an electric compressor. The multi-phase synchronous motor includes a rotor that is provided with a permanent magnet and a stator having coils of different phases. The motor drive device includes an inverter that supplies current to the coils and a control unit that controls the inverter. The control unit executes an initial angular position calculation processing of detecting a d-axis and a q-axis as an initial angular position of the rotor, a rotating processing of rotating the d-axis and the q-axis in a direction opposite to rotation of the rotor, an acceleration processing of accelerating the rotation of the rotor, and a sensorless control processing of controlling the rotation of the rotor.

Abstract: A motor drive device drives a multi-phase synchronous motor in an electric compressor. The multi-phase synchronous motor includes a rotor that is provided with a permanent magnet and a stator having coils of different phases. The motor drive device includes an inverter that supplies current to the coils and a control unit that controls the inverter. The control unit executes an initial angular position calculation processing of detecting a d-axis and a q-axis as an initial angular position of the rotor, a rotating processing of rotating the d-axis and the q-axis in a direction opposite to rotation of the rotor, an acceleration processing of accelerating the rotation of the rotor, and a sensorless control processing of controlling the rotation of the rotor.

Abstract: In an electric compressor for a vehicle, a sensor is provided between a filter circuit and a negative terminal of the electric motor that is connected to an in-vehicle power source. An inverter includes a controller which is configured to check the frequency of the ripple component of the input current to the inverter based on the current measured by the current sensor and variably sets the carrier frequency of the inverter so as not to coincide with the checked frequency.

Abstract: A motor-driven compressor in which an electric driving mechanism is capable of keeping high efficiency. The compressor includes an electric driving mechanism, a compression mechanism and a motor drive circuit. The electric driving mechanism is accommodated in a housing. The housing has a main body portion in a cylindrical shape, a bulging portion that bulges in a radially outward direction from the main body portion, and a partition wall. In the main body portion, a stator accommodation chamber is formed. In the stator accommodation chamber, a stator of the electric driving mechanism is accommodated. In the bulging portion, a cluster block accommodation chamber is formed. In the cluster block accommodation chamber, a cluster block is accommodated. A partition wall separates the stator accommodation chamber and the cluster block accommodation chamber in a radial direction. The main body portion and the partition wall support a stator core.

Abstract: A direct-current to three-phase alternating-current inverter system includes a three-phase motor, a plurality of switching elements, an inverter circuit for the three-phase motor, a capacitor, a direct-current power source and a control circuit. The switching elements arranged in the inverter circuit serve as upper and lower arms for the respective three phases of the three-phase motor, respectively. The capacitor is connected in parallel to the respective pairs of the upper and lower arms. The direct-current power source is arranged between the neutral-point of the three-phase motor and the respective lower arms or the respective upper arms. The control circuit controls the switching elements such that at least the switching frequency of one pair of the switching elements for one phase through which the current having the greatest value flows is lower than the switching frequencies of the other pairs of the switching elements for the other phases.