Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Tomokuni Kato

Youichi Fujita

Sotsuo Miyoshi

Kenta Hatano

Satoshi Kawamura

Masayuki Yokoyama

Sachiko Kawasaki

Naoki Imamura

Taihei Kawasaka

Atsushi Morimoto

Ryo Awaya

A motor control device includes: a first duty ratio computation unit to compute a first duty ratio to be used for control of a motor body portion on the basis of a target rotational position of a rotor and a rotational position of the rotor; a second duty ratio computation unit to compute a second duty ratio corresponding to an upper limit of the absolute value of the first duty ratio on the basis of a linear function including a variable corresponding to the number of rotations of the rotor; and a control signal output unit to output a control signal corresponding to the first duty ratio when the absolute value of the first duty ratio is smaller than the absolute value of the second duty ratio, and to output a control signal corresponding to the second duty ratio when it is not.

Motor control device, brushless DC motor, actuator, and EGR valve device

In a valve device (), when a valve () is closed, an output shaft of an actuator unit () is connected to the valve (). A control unit of the valve device () determines a control constant to be a value by which a response speed of the actuator unit () is smaller as ambient temperature is higher, and performs feedback control.

Valve device

A motor is provided with an insert nutthat has a knurled partat two places on the surface thereof along an axial direction thereof with projectionsfor whirl stop and slip-off stop formed on the knurled part, and that is embedded between the motor rotorand the magnet assemblyto perform fastening between the motor rotorand the magnet assembly, and in the insert nut, a concave partbetween the knurled partsis situated at a mounting boundary between the motor rotorand the magnet assembly

Motor

A valve device has integrally assembled thereto a valve side housinghaving a valve seat, a motor side housingprovided with a motor, and a feeder-side housinghaving a feeder unit, wherein a valve stemprovided with a valvefor abutting against the valve seatis extended to the interior of the feeder-side housing, a rotation stopperof the valve stemis provided at a predetermined position of the valve stem on its way to the feeder-side housing, a screw sectionis provided around the portion of the valve stem passing through the center holeof the rotorof the motor, the screw section being in mesh with a thread sectionformed around the surface of the center hole thereof, and a valve position detecting sensor is provided within the feeder-side housing

A sliding hole is formed so that a screw portion can pass therethrough. Also, a seal member is provided at a portion, through which the screw portion placed in the sliding hole can pass and in which a sliding portion does not slide.

Growing community of inventors

Tokyo, Japan

Tomokuni Kato