Abstract: Provided are a radical polymerization method in which, using a radical polymerization initiator with a low concentration of 1 mmol/L or less, a radical-polymerizable fluorine-based monomer can be radical-polymerized under a low temperature environment of a room temperature range without the need for an emulsifier such as PFOA; and a method for producing a radical-polymerized fluorine-based polymer using the radical polymerization method. The radical polymerization method is a radical polymerization method of radical-polymerizing a radical-polymerizable fluorine-based monomer using a polymerization initiator which generates perfluoroalkyl radicals by thermal decomposition, in which the polymerization initiator includes at least one of perfluoro-3-ethyl-2,2,4-trimethyl-3-pentyl or perfluoro-2,2,4-trimethyl-3-isopropyl-3-pentyl.

Abstract: In a control device for a switched reluctance motor, a voltage drop control is executed in which a voltage dropped to be lower than a voltage applied in a case where the switched reluctance motor is driven in a high-load region is applied to the switched reluctance motor, in a case where the switched reluctance motor is driven in a low-load region. The low-load region is a lower load region than the high-load region.

Abstract: A switched reluctance motor system includes a switched reluctance motor, a rotor including a plurality of salient poles, a stator including a plurality of salient poles, coils of three phases wound around the salient poles of the stator, and an electronic control unit. The electronic control unit is configured to drive the switched reluctance motor in a pole configuration pattern of NSNSNS in which the salient poles of the stator that have different polarities are alternately arranged. The electronic control unit is configured to perform current waveform control when an excitation sound frequency of a given order coincides with a resonance frequency of the switched reluctance motor.

Abstract: A switched reluctance motor system includes a switched reluctance motor, a rotor including a plurality of salient poles, a stator including a plurality of salient poles, coils of three phases wound around the salient poles of the stator, and an electronic control unit. The electronic control unit is configured to drive the switched reluctance motor in a pole configuration pattern of NSNSNS in which the salient poles of the stator that have different polarities are alternately arranged. The electronic control unit is configured to perform current waveform control when an excitation sound frequency of a given order coincides with a resonance frequency of the switched reluctance motor.

Abstract: In a control device for a switched reluctance motor, a voltage drop control is executed in which a voltage dropped to be lower than a voltage applied in a case where the switched reluctance motor is driven in a high-load region is applied to the switched reluctance motor, in a case where the switched reluctance motor is driven in a low-load region. The low-load region is a lower load region than the high-load region.