Hitachi, Ltd.

Hisaya Sasamoto

Kazuo Tahara

Haruo Koharagi

Noriyoshi Takahashi

Takayuki Matsui

Seiji Yamashita

Akira Takemura

An electromagnetic push-out unit which controls engagement and disengagement between a pinion gear and a ring gear for an engine in a starter device via a non-magnetic cylindrical member disposed concentrically with a pinion shaft mechanically coupled to an electrical motor. The electromagnetic push-out unit is concentrically disposed around the cylindrical member and comprises an electromagnetic coil, a stationary core for the electromagnetic coil, a movable core facing to the pole face of the stationary core and forming a magnetic circuit together with the stationary core via a first air gap and a bridge member extending along the moving direction of the movable core, magnetically coupled thereto and facing to the stationary core with a second air gap shorter than the first air gap thereby a part of the magnetic flux in the magnetic circuit bypasses through the bridge member to increase magnetic traction force acting between the stationary core and the movable core at the start of the travel of the movable core and to suppress the increase of the magnetic traction force at the end of the travel thereof.

Starter device

A novel armature of an electric rotating machine is disclosed. The armature core is divided axially into two or more members. The coils of the armature winding are fixed on the armature core in such a way that two or more coil sides are disposed in each slot of one member, and the coil sides disposed in the same slot are arranged in adjacent different slots of the other member. The end of each coil is positioned in a manner to substantially equalize the mutual inductance between each pair of adjacent coil ends.

Armature of rotating machine with means to balance the mutual inductance

The first and second interpole compensation windings are disposed on the commutation starting side and the commutation ending side of the interpole cores, respectively. The current flowing through the first and second interpole compensation windings are controlled in response to the first and second voltages detected by the first and second brushes disposed on the commutation starting side and the commutation ending side of the brushes.

Growing community of inventors

Mito, Japan

Hisaya Sasamoto