DRIVE CONTROL DEVICE OF DYNAMIC PRESSURE BEARING PUMP UNIT, DYNAMIC PRESSURE BEARING PUMP SYSTEM INCLUDING THE DRIVE CONTROL DEVICE, AND DRIVE CONTROL METHOD OF DYNAMIC PRESSURE BEARING PUMP UNIT

摘要

PROBLEM TO BE SOLVED: To provide a technology capable of improving durability of a dynamic pressure bearing pump.;SOLUTION: A drive control device 300 of a dynamic pressure bearing pump unit 1 includes a rotational speed operation volume 350 for varying a rotational speed of an impeller 10, a computer 310, a power conversion circuit 335 for converting power from a power supply circuit 330 in accordance with an instruction from the computer 310 and supplying the power to a motor 210 of a pump drive device 200. In a process of increasing an operation amount of the rotational speed operation volume from 0 operation amount, the power conversion circuit 335 controls the power to be supplied to the motor 210 in such a manner that in an initial operation period from the 0 operation amount to a predetermined specific operation amount, the rotational speed of the impeller is increased at a predetermined rotational speed change rate up to a floatation minimum rotational speed at which the impeller 10 floats from the dynamic pressure bearing surface and is supported in a non-contact state regardless of the changes in the operation amount in the initial operation period, provided that the operation amount of the rotational speed operation volume reaches the specific operation amount.;COPYRIGHT: (C)2013,JPO&INPIT