Hitachi, Ltd.

Tadao Shimotsu

Kunio Miyashita

Tsunehiro Endo

Shigehisa Hagura

Seiji Ishida

Seizi Yamashita

Norinaga Suzuki

Kenji Nandoh

Toshihiko Wada

Syoji Tanabe

Hiroyuki Benya

An inverter apparatus includes a basic control section including a main circuit which includes an inverter, and a control unit which controls the main circuit. The inverter apparatus also includes an I/O block which is connected to the basic control section, and is selected from a plurality of different types of I/O blocks. The I/O block includes an input/output interface. The input/output interface includes a signal connection terminal which transmits an input/output signal to/from the control unit. Operation management specifications of the main circuit are fixed independently of operation management specifications of the input/output interface. Operation specifications of the inverter apparatus change depending on the operation management specifications of the input/output interface, and are determined by the type of the I/O block which is connected to the basic control section, such that connecting the different types of I/O blocks to the basic control section causes the inverter apparatus to have different operation specifications.

Inverter apparatus having operation specifications determined by type of

Frequency inverter

A synchronized induction motor comprises a stator including a cylindrical armature core having an armature winding wound thereon for generating a rotating magnetic field, a cylindrical housing for housing the stator therein, end brackets mounted at opposite open ends of the housing and having a bearing mounted at a center portion thereof a rotor shaft concentrically arranged in the stator axially of the armature core and rotatably supported by bearings, a rotor core mounted concentrically with the rotor shaft on the rotor shaft and magnetically coupled to the armature core through an air gap, end plates mounted to sandwich the rotor core, starting secondary conductors arranged axially of the rotor shaft in the vicinity of an outer circumference of the rotor core and adapted to cooperate with the stator which is held by the end plate to form an induction motor, end rings for shorting the ends of the secondary conductors on the end plates, balance rings mounted on the rotor shaft in the vicinity of the bearings, sumarium-cobalt split-type permanent magnets arranged around the outer circumference of the rotor core axially of the rotor shaft, and an epoxy fiber impregnated glass fiber tape or stainless steel tape for holding the permanent magnets on the rotor core. The permanent magnets are magnetized after they have been mounted on the rotor core.

Synchronized induction motor

Growing community of inventors

Sakura, Japan

Tadao Shimotsu