Abstract: An electret includes an electret layer. The electret layer is formed by subjecting a composite film in which inorganic dielectric particles are dispersed and held in a base film to a polarization treatment. The inorganic dielectric particles are mainly composed of an inorganic dielectric material having a bandgap energy of 4 eV or more.

Abstract: To provide a controller for AC rotary electric machine which can compensate error of the actual on-duty with respect to the command on-duty calculated from command voltage with good accuracy, with a simple circuit configuration. A controller for AC rotary electric machine detects an actual on-duty of the switching device based on the detection value of the midpoint potential which is the potential of the connection node of the series connection in the series circuit; calculates an on-duty error based on the difference between the command on-duty and the actual on-duty; and corrects the voltage command or the command on-duty based on the on-duty error.

Abstract: An electronic component includes a member with marking having at least one marking area to be processed digitally, as well as a member other than the member with marking. The marking allows for tracing the production history of individual electronic components.

Abstract: A control device for an AC rotating electric machine includes: a temperature detection unit configured to detect a temperature of a protection part; a maximum current adjustment unit configured to adjust a maximum current of an AC rotating electric machine so as to prevent the temperature of the protection part from exceeding a set temperature; an allowable torque calculation unit configured to calculate an allowable torque based on the maximum current adjusted; a torque command adjustment unit configured to adjust a torque command value directed to the AC rotating electric machine based on the allowable torque; an upper limit number-of-rotation calculation unit configured to calculate an upper-limit number of rotations of the AC rotating electric machine based on the maximum current adjusted; and a number-of-rotation adjustment unit configured to adjust the number of rotations of the AC rotating electric machine based on the upper-limit number of rotations.

Abstract: Provided is a control device for an AC rotating electric machine, which includes: a temperature detection unit configured to detect a temperature of a protection unit provided in an object to be protected when a current is supplied from a power conversion circuit including a switching element to the AC rotating electric machine and output, as a detected temperature, one of the temperature and a temperature of the object to be protected that is estimated from the temperature; a temperature compensation unit configured to calculate, through use of the detected temperature output from the temperature detection unit, a compensated temperature equal to or higher than the detected temperature; and a torque limiting unit configured to limit, through use of the compensated temperature calculated by the temperature compensation unit, a torque command value input thereto.

Abstract: A control device for an AC rotating electric machine includes: a temperature detection unit configured to detect a temperature of a protection part; a maximum current adjustment unit configured to adjust a maximum current of an AC rotating electric machine so as to prevent the temperature of the protection part from exceeding a set temperature; an allowable torque calculation unit configured to calculate an allowable torque based on the maximum current adjusted; a torque command adjustment unit configured to adjust a torque command value directed to the AC rotating electric machine based on the allowable torque; an upper limit number-of-rotation calculation unit configured to calculate an upper-limit number of rotations of the AC rotating electric machine based on the maximum current adjusted; and a number-of-rotation adjustment unit configured to adjust the number of rotations of the AC rotating electric machine based on the upper-limit number of rotations.

Abstract: To provide a controller for AC rotary electric machine which can compensate error of the actual on-duty with respect to the command on-duty calculated from command voltage with good accuracy, with a simple circuit configuration. A controller for AC rotary electric machine detects an actual on-duty of the switching device based on the detection value of the midpoint potential which is the potential of the connection node of the series connection in the series circuit; calculates an on-duty error based on the difference between the command on-duty and the actual on-duty; and corrects the voltage command or the command on-duty based on the on-duty error.

Abstract: In order to reduce deviation of correction amount when calculating a magnetic pole position correction amount of a permanent magnet type rotating electrical machine, and perform magnetic pole position correction with high accuracy, in state where the permanent magnet type rotating electrical machine is rotated, a d-axis current command value and a q-axis current command value in dg vector control are kept substantially zero, an actual d-axis voltage and an actual q-axis voltage are calculated from a midpoint potential detected from a midpoint potential detection unit, a magnetic pole position correction amount is calculated based on a predetermined arithmetic expression from the actual d-axis voltage and the actual q-axis voltage, and magnetic pole position origin correction is performed based on the magnetic pole position correction amount.

Abstract: A power conversion device includes a backup power source as a power source for a discharge controller that discharges electric charges of a capacitor, and an abnormal state in the backup power source or loads is not capable of being dealt with when power is supplied to loads from the backup power source, which makes an output voltage of the backup power source be in an abnormal state. In order to solve the problem, when an abnormality occurs in the backup power source or in loads and the abnormality is detected in power supply from the backup power source, a place where the abnormality occurs is specified. When the specified place where the abnormality occurs is a load, power supply to the load is stopped, thereby preventing the output voltage of the backup power source from being abnormal even when an abnormality occurs in part of power supply destinations.

Abstract: An electronic component includes a member with marking having at least one marking area to be processed digitally, as well as a member other than the member with marking. The marking allows for tracing the production history of individual electronic components.

Abstract: Provided is a control device for an AC rotating electric machine, which includes: a temperature detection unit configured to detect a temperature of a protection unit provided in an object to be protected when a current is supplied from a power conversion circuit including a switching element to the AC rotating electric machine and output, as a detected temperature, one of the temperature and a temperature of the object to be protected that is estimated from the temperature; a temperature compensation unit configured to calculate, through use of the detected temperature output from the temperature detection unit, a compensated temperature equal to or higher than the detected temperature; and a torque limiting unit configured to limit, through use of the compensated temperature calculated by the temperature compensation unit, a torque command value input thereto.

Abstract: An electronic component includes a member with marking having at least one marking area to be processed digitally, as well as a member other than the member with marking. The marking allows for tracing the production history of individual electronic components.

Abstract: In inverter control for supplying power to a motor, a power conversion device includes a temperature sensor for detecting a temperature of the inverter, a voltage sensor for detecting a voltage between terminals of a capacitor that smooths the voltage between terminals between the power source and the inverter, an inverter controller for controlling the inverter, a rotation speed sensor for detecting a rotation speed of the motor, an electric current sensor for detecting electric current supplied to the motor and a discharge determination instruction controller for giving an instruction for discharging electric charges accumulated in the capacitor, in which, control of reducing the rotation speed of the motor and discharge control of the capacitor are performed in accordance with the temperature of the inverter, the rotation speed of the motor and the electric current supplied to the motor.

Abstract: In order to reduce deviation of correction amount when calculating a magnetic pole position correction amount of a permanent magnet type rotating electrical machine, and perform magnetic pole position correction with high accuracy, in state where the permanent magnet type rotating electrical machine is rotated, a d-axis current command value and a q-axis current command value in dg vector control are kept substantially zero, an actual d-axis voltage and an actual q-axis voltage are calculated from a midpoint potential detected from a midpoint potential detection unit, a magnetic pole position correction amount is calculated based on a predetermined arithmetic expression from the actual d-axis voltage and the actual q-axis voltage, and magnetic pole position origin correction is performed based on the magnetic pole position correction amount.

Abstract: In inverter control for supplying power to a motor, a power conversion device includes a temperature sensor for detecting a temperature of the inverter, a voltage sensor for detecting a voltage between terminals of a capacitor that smooths the voltage between terminals between the power source and the inverter, an inverter controller for controlling the inverter, a rotation speed sensor for detecting a rotation speed of the motor, an electric current sensor for detecting electric current supplied to the motor and a discharge determination instruction controller for giving an instruction for discharging electric charges accumulated in the capacitor, in which, control of reducing the rotation speed of the motor and discharge control of the capacitor are performed in accordance with the temperature of the inverter, the rotation speed of the motor and the electric current supplied to the motor.

Abstract: A power conversion device includes a backup power source as a power source for a discharge controller that discharges electric charges of a capacitor, and an abnormal state in the backup power source or loads is not capable of being dealt with when power is supplied to loads from the backup power source, which makes an output voltage of the backup power source be in an abnormal state. In order to solve the problem, when an abnormality occurs in the backup power source or in loads and the abnormality is detected in power supply from the backup power source, a place where the abnormality occurs is specified. When the specified place where the abnormality occurs is a load, power supply to the load is stopped, thereby preventing the output voltage of the backup power source from being abnormal even when an abnormality occurs in part of power supply destinations.

Abstract: In an embodiment, a coil component 10 has a drum core 20 housed in a through hole 32 of a ring core 30, and two types of securing parts are provided in a gap G between an outer circumference of one flange part 24 of the drum core 20 and an inner circumference of the through hole 32. Terminal electrodes 50A, 50B connecting to ends 46A, 46B pulled out from a winding wire 40 wound around the drum core 20 are assembled to the ring core 30. Second securing parts 60A, 60B are arranged to opposite to each other with respect to a center C of the flange part 24, and first securing parts 62A, 62B are provided to cover an outer side of the second securing parts 60A, 60B. A hardness of the second securing part is higher than that of the first securing part.

Abstract: When a motor rotation speed is equal to or greater than a predetermined rotation speed when an automobile collision is detected or when power stops, a motor rotation speed reduction control is carried out by an inverter control unit, and when an inter-terminal voltage of a secondary smoothing capacitor drops below a predetermined voltage during the motor rotation speed reduction control, the motor rotation speed reduction control is stopped, whereby induction voltage caused by motor rotation is applied to the secondary smoothing capacitor, the inter-terminal voltage of the secondary smoothing capacitor is raised, and the motor rotation speed reduction control is carried out while keeping the inter-terminal voltage of the secondary smoothing capacitor within an operating voltage range of the inverter control unit.

Abstract: In a DC-DC voltage conversion device, overheat of a diode element connected in anti-parallel with a semiconductor switching element is a problem, and in order to resolve this, a temperature of a semiconductor switching element of a main conversion circuit is detected, a temperature of a diode element connected in parallel with the semiconductor switching element is calculated using a correction calculation of the detected semiconductor switching element temperature value in accordance with a step-up ratio of the DC-DC voltage conversion device, and diode element overheat protection is carried out in accordance with the calculated temperature value.

Abstract: A power conversion device provided with a DC power source, a voltage boost converter, an inverter, a primary smoothing capacitor, a secondary smoothing capacitor, an intermediate capacitor provided in the voltage boost converter and three voltage sensors which measure the voltages of the capacitors, further including an abnormality diagnosis controller which makes a diagnosis of the presence/absence of an abnormality in the detection characteristics of the voltage sensors, on the basis of the state of transition of the detection results of the voltage sensors which are monitored during a discharge operation by the respective capacitors.