Fujitsu General Limited

Yuji Souma

Kenji Narita

Takashi Suzuki

Yoshichika Fukuda

Koji Kawanishi

Yuji Kawai

Hiroyuki Okudera

Yusuke Kikuchi

Takushi Fujioka

Ken Maeyama

Chanaporn Thanathitipong

Youichi Tanabe

Akihiro Ito

Michihiro Shibamoto

Nopporn Jirojjaturonn

A radial-air-gap induction motor is constituted so as to have two air gaps by setting a rotor between a cylindrical outer stator and inner stator in order to improve an efficiency by increasing the ratio of torque/(square of current) by a two air gaps, apply windings for generating a rotating magnetic field to the outer and inner stators, and form squirrel-cage windings on the rotor.

Induction motor

In a permanent magnet rotor type electric motor in which a permanent magnet is embedded in a rotor, a permanent magnet used for a magnetic pole of one polarity in a rotor core and another permanent magnet used for a magnetic pole of the other polarity have different configurations and materials from each other, so that the selecting range for the magnetic flux density and the reluctance torque of the permanent magnet rotor type electric motor can be increased.

Permanent magnet rotor type electric motor

In an electric motor, such as a DC brushless motor or the like, having a permanent magnet in a rotor, each magnetic pole is formed of three permanent magnets, and the permanent magnets are made of at least two kinds of magnetic materials represented by ferrite magnet and rare-earth magnet. Thus, in a permanent magnet rotor type electric motor, a reluctance torque and a magnetic flux density can be selectively established, and cost is reasonable, corresponding to the quality.

Permanent magnet rotor type electric motor with different permanent

A permanent magnet rotor type electric motor is formed of a stator core generating a rotation magnetic field, and a rotor core rotationally situated inside the stator core. The rotor core includes a first core member for generating a magnet torque, permanent magnets embedded in the first core member for forming magnetic poles, and a second core member for generating a reluctance torque without having a permanent magnet therein. The second core member is coaxially united with the first core member so that the rotor core is divided into the first core member for generating the magnet torque and the second core member for generating the reluctance torque.

In a permanent magnet rotor type electric motor having a stator core generating a rotation magnetic field and provided therein with a rotor core in which each magnetic pole is formed by a permanent magnet, the rotor core is fabricated by coaxially and unitedly joining a first core member and a second core member, in which a first permanent magnet of a predetermined cross-section shape is embedded per magnetic pole in the first core member, and a second permanent magnet which is made of a different material and has a different cross-section shape from those of the first permanent magnet is embedded per magnetic pole in the second core member, thereby achieving the permanent magnet rotor type electric motor having the performance and size appropriate for the intended use.

Growing community of inventors

Kawasaki, Japan

Yuji Souma