Denso Corporation

Sukhwa Jung

Atsushi Kobayashi

Naoki Watanabe

Michihiro Makita

Tetsuya Ohmi

Yuki Matsumoto

Tsukasa Kono

Magnets are arranged at intervals along a stroke direction with an interposed space. Magnetic pole surfaces of adjacent ones of the magnets have opposite poles. A detector is arranged with a gap in a gap direction against a magnetic pole surface of each of the magnets and acquires a sine signal and a cosine signal as detection signals of phases corresponding to the positions of the magnets, based on a change in a magnetic field received from the magnets according to movement of the detector relative to the detection object in the stroke direction. A signal processor acquires the sine signal and the cosine signal from the detector, generates, based on the sine signal and the cosine signal, an arctangent signal corresponding to a stroke amount of the detection object relative to the detector, and acquires the arctangent signal as a position signal.

Linear position sensor

A control apparatus is provided for controlling energization of a multiple-winding rotating electric machine. The control apparatus includes inverters respectively corresponding to winding sets of the machine and a controller. The unit of a group of components provided for the energization of one winding set is defined as a system. The controller is configured to: (1) offset switching timings of switch elements of each of the inverters from those of switch elements of any other of the inverters; and (2) determine switching patterns of systems, based on an evaluation function of common-mode voltages of the systems, so as to minimize electro-magnetic interference due to the common-mode voltages. In each of the systems, the common-mode voltage of the system is defined as the difference in electric potential between a neutral point in voltage of a DC power source and a neutral point of the winding set corresponding to the system.

Control apparatus for multiple-winding rotating electric machine

A control apparatus controls a rotating machine including a stator having groups of phase windings, to control current application to the groups. The control apparatus includes power converters converting received power to AC power and supplying the AC power to the rotating machine, a harmonic component cancellation section reducing a harmonic component superimposed on a fundamental wave component by a cancellation process in an estimated-rotating coordinate system for at least one of voltage and current of each system, when a unit of a group of components controlling current application to a specific group of the windings is defined as a system, an induced voltage estimation section estimating an induced voltage based on information common to the systems including a voltage value and a current value calculated by the cancellation process, and a magnetic-pole-position estimation section estimating a magnetic pole position of a rotor based on the estimated induced voltage.

Growing community of inventors

Kariya, Japan

Sukhwa Jung