Abstract: In a control apparatus for a rotating electric machine, a phase feedback gain is set such that first and second conditions are met. The first condition is that gain margin and phase margin in frequency characteristics of a first loop transfer function are ensured. The second condition is that a gain intersection angular frequency in frequency characteristics of the first loop transfer function is lower than respective resonance angular frequency in frequency characteristics of first and second transfer functions. An amplitude feedback gain is set such that third and fourth conditions are met. The third condition is that gain margin and phase margin in frequency characteristics of a second loop transfer function are ensured. The fourth condition is that a gain intersection angular frequency in frequency characteristics of a second loop transfer function is lower than respective resonance angular frequency in frequency characteristics of third and fourth transfer functions.

Abstract: A control apparatus for an AC motor includes an inverter, a voltage-command calculation unit calculating a vector used for giving a command to the inverter, a voltage-waveform specifying unit specifying, as a voltage waveform for operating the inverter based on the vector, a pulse pattern selected from previously stored voltage waveforms, or a voltage waveform of a PWM signal generated by a comparison between a phase voltage and a carrier wave, an amplitude-spectrum extraction unit obtaining a bus current of the inverter to extract an amplitude spectrum of a specific frequency corresponding to a resonance frequency of a circuit through which the bus current flows, and a voltage-amplitude limiting unit limiting an amplitude of the vector so that the amplitude spectrum of the specific frequency becomes less than a threshold, if the amplitude spectrum of the specific frequency correlating with the voltage waveform is the threshold or more.

Abstract: A control apparatus operates an inverter by overmodulation pulse width modulation control or rectangular wave control to control an output torque of a motor to a command torque. When a first condition is not met, the inverter is operated by the overmodulation pulse width modulation control. The first condition is that an amplitude parameter increases and reaches a determination value. The amplitude parameter is an amplitude of an output voltage vector of the inverter or a modulation factor of the output voltage of the inverter. When the first condition and a second condition are met, operation of the inverter is switched from operation by the overmodulation pulse width modulation control to operation by the rectangular wave control. The second condition is that a change amount in a negative d-axis direction of a current vector of current flowing to the motor after the first condition is met reaches a predetermined amount.

Abstract: A nonaqueous electrolyte solution for a secondary battery, the nonaqueous electrolyte solution containing an electrolyte, a solvent, and an additive, in which the additive contains a compound represented by formula (1) below, and the content of the compound is 0.01 to 10 parts by mass relative to 100 parts by mass of the total of the solvent. A nonaqueous electrolyte secondary battery employing the nonaqueous electrolyte solution is also disclosed. wherein R1 represents an alkyl group having 1 to 6 carbon atoms, a phenyl group, or an acetoxy group, and R2 represents an alkyl group having 1 to 6 carbon atoms, a phenyl group, or a vinyl group.

Abstract: A nonaqueous electrolyte solution for a secondary battery, the nonaqueous electrolyte solution containing an electrolyte, a solvent, and an additive, in which the additive contains a compound represented by formula (1) below, and the content of the compound is 0.05 to 10 parts by mass relative to 100 parts by mass of the total of the solvent. Also disclosed is a nonaqueous electrolyte secondary battery employing the nonaqueous electrolyte solution. (R1R2C?CH—CO—O—)nY??(1) wherein R1 and R2 are each independently a hydrogen atom, a methyl group, or an amino group, n is 1, 2, or 4, when n is 1, Y is a hydrogen atom or a monovalent organic group, when n is 2, Y is a divalent organic group, and when n is 4, Y is a tetravalent organic group.

Abstract: A nonaqueous electrolytic solution for a secondary battery containing an electrolyte, a solvent and methyl difluoroacetate as an additive in an amount of not less than 0.05 part by mass and not more than 10 parts by mass based on 100 parts by mass of the whole solvent.

Abstract: An inspecting ECU 4 and a GD substrate 3 are connected to an inverter circuit 100 for converting a power to be supplied from a voltage source 2 and outputting the converted power to a motor 5, and switch a conducting state of each of the elements in the inverter circuit 100. A conducting state of the element is switched in accordance with a driving condition for inspection corresponding to a whole active region of the element in a state that an inspecting load 50 is connected to the inverter circuit 100. A phase current flowing in the element and a voltage between terminals of the element through a voltage detector 11 and a current detector 12 are detected to obtain a correlation of an ON time of the element and a phase current value based on the current and the voltage which are detected.

Abstract: An inspecting ECU 4 and a GD substrate 3 are connected to an inverter circuit 100 for converting a power to be supplied from a voltage source 2 and outputting the converted power to a motor 5, and switch a conducting state of each of the elements in the inverter circuit 100. A conducting state of the element is switched in accordance with a driving condition for inspection corresponding to a whole active region of the element in a state that an inspecting load 50 is connected to the inverter circuit 100. A phase current flowing in the element and a voltage between terminals of the element through a voltage detector 11 and a current detector 12 are detected to obtain a correlation of an ON time of the element and a phase current value based on the current and the voltage which are detected.