Hitachi Koki Co., Ltd.

Hitachi Koko Co., Ltd.

Satoshi Numata

Noriyasu Matsufuji

Koji Unno

Hiroyuki Takahashi

Masahiro Inaniwa

Shinji Watanabe

Kazuyoshi Tokunaga

Takahiro Fujimaki

Mitsutoshi Yotsuyanagi

Nobuharu Kido

Kahoru Takahashi

Hisanobu Oyama

A centrifugal separator includes an input section for allowing a user to enter operating conditions of a centrifugal separation of a sample accommodated in a rotor driven by a motor. A memory of the centrifugal separator stores a user ID code and a corresponding user name which are registered in advance by the user. Operation of the centrifugal separator is allowed when a user ID code entered through the input section agrees with the registered user ID code.

Centrifugal separator and administration of user and actual operation of the same

A transformer outputs different (high or low) secondary voltages. A switch outputs high or low secondary voltage according to a mode signal. An electric power converter including a rectifying circuit and a switching circuit either charges a smoothing capacitor with an output of the switch or discharges the smoothing capacitor to supply a regenerative current toward the transformer with a power fact improved. An phase signal generation circuit generates PWM or PAM phase signals in accordance with the mode signal. An inverter circuit generates driving signals supplied to the motor in response to the phase signals from power from the smoothing capacitor. A mode determining circuit determines one of modes to generate the mode signal in accordance with a speed command signal and acceleration/deceleration which is indicated by the rotating speed signal and the rotating speed command signal.

Motor control apparatus

A centrifugal apparatus is disclosed which includes a rotor, a motor, a speed signal generator, including a disc having alternate reflective and non-reflective stripes, for generating a rotating speed signal of the rotor, a microprocessor (mpu), an analog processing circuit. The rotating speed of the rotor is judged by both the microprocessor and the analog processing circuit including a F/V converter and a voltage comparator independently, so that an overspeed condition is prevented. The mpu may further detect a motor rotating speed and compare the variation in the rotating speed signal of the rotor and the rotating speed of the motor. If the difference exceeds a reference, the mpu stops the rotor. Another disc of which reflective strip is replaced by a non reflective strip may be provided to the rotor and a pulse compensation circuit for compensating the lack of the pulse in the rotating speed signal is also provided. This type of the disc is provided to distinguish the types of these rotors. The pulse compensation circuit detects the lack of the pulse and then, generates and adds a pulse to the rotating speed signal.

Centrifugal apparatus with protection

A processor (9) within an apparatus for managing a centrifuge by operation results (8) identifies an ID card of a user who operates a centrifuge (1) through a card reader (12). Further, a rotation signal (7) that will serve as operation result data of the centrifuge is received through a counter (10), and a rotation start time and a rotation stop time of a drive section (3) are read by a real-time clock. Still further, the processor (9) calculates the operation result data, displays the calculated data on a display section (16), stores the operation result data in a memory (15), and outputs the operation result data to a printer (13) as may be required by the user.

Centrifuge management system

Growing community of inventors

Hitachinaka, Japan

Satoshi Numata