Method for controlling time-average rotational speed of e.g. fan-motor utilized for driving air-conveying blower to dry silica gel, involves switching-on and off electrical power for driving motor, so that motor is continuously rotated

摘要

The method involves switching-on and off electrical power for rotationally driving an electric motor e.g. fan-motor and honeycomb rotary motor, so that the electric motor is continuously rotated. The electric motor is overheated during switching-on the electric motor in short period with respect to continuous operation.