Koyo Seiko Company, Ltd.

Kabushiki Kaisha Toshiba

Sadaaki Mori

Hirohide Inayama

Atsushi Ishihara

Tomofumi Takahashi

Minoru Kitabayashi

Tetsuo Horie

Hideki Jonokuchi

Noburu Fukushima

Hisashi Yoshino

Masakatsu Haga

Masachika Iida

A bridge () in conformity with a tooth opening angle of the stator () is provided between a permanent magnet () and a permanent magnet () in a rotor (), so that a magnetic flux for a reluctance torque is made to pass an inner side of the permanent magnet (). An opening angle of each of ribs () on both sides of the permanent magnet () is set to be equal to or smaller than the teeth interval opening angle and equal to or larger than a half thereof. Thereby, reluctance of the rib () against a magnetic flux in a circumferential direction is increased and leakage of the magnetic flux of the permanent magnet () is prevented.

Brushless DC motor

The power steering apparatus comprises a torque sensor for detecting a steering torque applied to a steering wheel and a steering assist motor which is driven to rotate based on the detected steering torque. The motor is driven under field weakening control in a high-speed rotation area. The motor is a brushless motor comprising a rotor having a plurality of permanent magnets which are respectively fixed in a plurality of recesses provided in a rotor core. With the electric power steering apparatus, a steer-assisting force can be obtained in high-speed steering.

Electric power steering apparatus

A brushless DC motor including a stator having plural slots; and a rotor which has plural permanent magnets and is divided into three rotor blocks in a rotation axis direction, the three rotor blocks being layered so that the arrangement angles of the rotor blocks differ from each other by an amount of a mechanical angle in a rotary direction that is equivalent to one third of a pulsation period of cogging torque generated by the rotor and stator. A brushless DC motor including a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and a stator having plural slots arranged at an equal pitch in a circumferential direction. The magnetic poles of the rotor include magnetic poles whose magnet deviation angle formed by the central line of an effective polar opening angle and the central line of the magnet mounting hole is the first angle; and magnetic poles whose magnet deviation angle is the second angle different from the first angle.

Brushless DC motor and method of manufacturing brushless DC motor

A protection circuit for a semiconductor device is disclosed. This circuit is connected in series with a power semiconductor device to be protected, and is comprised of a circuit breaker and current-limiting device. The current-limiting device limits the overcurrent, thereby providing a time allowance until the circuit breaker begins operate.

Protection circuit for a semiconductor device

Growing community of inventors

Mie, Japan

Sadaaki Mori