Nsk Corporation

Sachio Nakayama

Toru Sakaguchi

Yuzuru Hoshi

Kenji Mori

Yoshiyuki Watanabe

Masahiro Maeda

Yousuke Imamura

Takashi Baba

Masaru Wada

Shinichi Tanaka

Masanori Shingou

Manabu Okamura

An electric power steering apparatus that protects Zener diodes without impairing steering performances by time-integrating a loss power of the Zener diodes for protecting FETs and gradually limiting a duty ratio with an increase in an integrating loss. The apparatus includes a loss power calculating section that calculates a loss power when a difference between an ignition voltage and an inverter applying voltage is equal to or more than a predetermined voltage; an integrating loss calculating section to calculate an integrating loss of the loss power; a permissible loss calculating section to calculate a permissible loss based on a temperature; a minimum value selecting section to select a minimum value of a loss difference of the permissible loss and the integrating loss; and a limit value calculating section to calculate a limit value of the PWM-signal based on the minimum value of the loss difference and the permissible loss.

Electric power steering apparatus

A motor control apparatus that is capable of making the whole control system robust not only with respect to motor parameter variations such as the temperature variation and the manufacturing unevenness but also with respect to disturbances while using a cheap and compact one-shunt type current detecting circuit and simultaneously diagnosing an estimation error and an electric power steering apparatus provide with the motor control apparatus.

Motor control apparatus and electric power steering apparatus provided with the same

The electric power steering apparatus includes a brushless motor as an electric motor. The motor has a rotor and a statorThe statorincludes: a back core BY; a plurality of teeth TS disposed along the circumference of the back core protruding from the back core BY toward its radial center and forming slots SL therebetween; and an exciting coilwound around each of the teeth TS. Each of the slots SL is filled with a resin material. The back core BY is partially press-fitted into a yokeso that the outer surface of the back core BY comes partially into contact with the inner surface of the yokealong their circumferences.

A motor comprising a motor-wiring bus bar including a plurality of annular ring conductors connecting lead wires of the motor including a stator in which a plurality of stator cores having the lead wires is arranged in a circle or connecting the lead wires and a power line together and a plurality of terminals attached to the ring conductors. The ring conductors are different in diameter and arranged concentrically on a same plane.

Motor, method for manufacturing motor, and motor drive controller

Growing community of inventors

Maebashi, Japan

Sachio Nakayama