Hitachi, Ltd.

Kenya Takarai

Masashi Kitamura

Fumio Tajima

Yuji Enomoto

Yuji Nomoto

Hiroshi Kanazawa

Takayuki Koyama

Susumu Tajima

A pump is driven by a compact electric motor in which a coil is disposed in a ring form around and along a stator core which has a plurality of claw magnetic poles that extend alternately from both ends of one member of the stator core toward the end of the other member thereof. A stator core can be made from a compressed powder core by molding with resin, with the molded portion able to serve as a partition separating pump and motor units.

Electric pump

Electric Pump

It is made easy for a stator winding to be wound around a stator core and degradation in efficiency is prevented as much as possible. A stator () includes a plurality of phases, i.e., of circumferentially divided stator magnetic poles (). The stator magnetic poles () are each composed of an arcuate stator core () having a plurality of axially extending claw poles () and a circumferentially elliptically wound stator winding (). The stator magnetic poles () are magnetically divided; therefore, magnetic flux leakage is reduced to improve efficiency. Air flowing between the stator magnetic poles () can improve a cooling effect.

Rotating electrical machine and alternating-current generator

Growing community of inventors

Atsugi, Japan

Kenya Takarai