Denso Corporation

Shingo Inaishi

Satoshi Takada

Rikizou Akagi

Shinya Ishikawa

Hirotsugu Douba

Hideyuki Sumino

Ryuichi Kanbe

A bearingof a support portionfor rotatably supporting a shaftof a rotating bodyto be measured with respect to the magnitude of unbalance thereof is formed into a hollow U-shape and has formed therein an injection portfor injecting a gas towards the shaft. As the shaft can be supported and floats without making contact with the bearing by virtue of the gas injected from the injection port, the friction can be made small and, hence, a change in rotational speed can be made small. The number and position of the injection ports are determined as required.

Unbalance measuring apparatus

It is an object of the present invention to provide a method of manufacturing a rotor for an electric motor, in which displacement of the center of gravity is prevented. According to a feature of the present invention, a rotor for an electric motor comprises an inner core fixed to a rotating shaft of the rotor and multiple coil units respectively fixed to the inner core, wherein the coil unit has an outer core, a bobbin and a winding wound on the bobbin, and wherein weight of outer cores as well as winding units (the bobbin and the winding wound thereon) is respectively measured and stratified into several groups, necessary number of the outer cores and winding units are respectively picked out from the same stratified group and then such outer cores and winding units are assembled to the inner core.

Method of manufacturing a rotor of an electric motor

Growing community of inventors

Gamagoori, Japan

Shingo Inaishi