公开(公告)号：WO1987000770A1

公开(公告)日：1987-02-12

申请号：PCT/US1986001488

申请日：1986-07-16

Applicant: BECKMAN INSTRUMENTS, INC.

Inventor： BECKMAN INSTRUMENTS, INC. ,  EHRET, Robert, J.

IPC: B04B09/10

CPC classification number: B04B9/10 ,  B04B13/003 ,  H02H7/093

Abstract: An overspeed protection signal override system disables the tach signal from a centrifuge rotor tachometer, so that the inverter-drive control circuit is unable to send a multi-phase motor drive signal to an A.C. induction motor, and the centrifuge rotor and motor are shut down, in response to an alarm signal from the overspeed protection circuit. The override signal is provided to assure that once the overspeed protection circuit of the centrifuge detects an alarm condition characteristic of rotor overspeed, the tach signal which drives the inverter is disabled and withdrawn from motor control, so that an A.C. induction motor will coast to rest even if the current control of the induction motor is not functioning properly.

Abstract translation: 超速保护信号超驰系统禁用离心转子转速计的tach信号，使变频器驱动控制电路不能向交流感应电机发送多相电机驱动信号，离心机转子和电机关闭 响应来自超速保护电路的报警信号。 提供超驰信号以确保一旦离心机的超速保护电路检测到转子超速的报警状态，驱动变频器的tach信号被禁止并从电动机控制中撤出，使得AC感应电动机将惯性停车 即使感应电动机的电流控制不能正常工作。

公开(公告)号：WO1980001359A1

公开(公告)日：1980-07-10

申请号：PCT/US1979001049

申请日：1979-11-28

Applicant: WESTERN STATES MACHINE CO

Inventor： WESTERN STATES MACHINE CO ,  BANGE J

IPC: B04B09/10

CPC classification number: B04B9/10 ,  B04B9/04 ,  Y10T477/328

Abstract: An improved cyclical centrifugal machine (10) includes a rigid support (14) mounted above the basket (22) of the machine, a bearing housing (20) suspended from the support for gyratory motion, a basket-carrying spindle (18) rotatable in fixed position relative to the housing on bearings therein, and an electric motor (12) for bringing the spindle and basket to rotational speed. The improved centrifugal machine (10) also comprises a system for controlling transmission of torque from the motor (12) to the basket (22) by means of a clutch (26) having relatively rotatable clutch members (44) and (50) adapted to transmit torque through liquid films between them. The clutch (26) is operated to vary the torque transmitted from the motor (12) to the basket (22) so as to produce a maximum load to be placed on the motor (12) for producing a desired basket speed. To so operate the clutch (26), signals proportionate respectively to the instantaneous load on the motor (12) and the instantaneous speed of the basket (22) and reference signals representing respectively the maximum load to be placed on the motor (12) and the desired operating speed, are compared to produce from them a resultant signal representing the instantaneous relationship of the actual load on the motor (12) to the maximum load. The clutch (26) is then operated to vary the torque transmitted through the liquid films between the clutch members (44) and (50) in response to the resultant signal to produce the maximum load.

Abstract translation: 循环离心机（10）包括安装在机器筐（22）上方的刚性支撑件（14），悬挂在支撑件上用于旋转运动的轴承壳体（20），可旋转筐支撑轴（18） 相对于壳体在其轴承上的固定位置以及用于使轴和篮转动到转速的电动机（12）。 改进的离心机10还包括用于借助于具有离合器部分44和50的离合器26来控制从发动机12到篮筐22的扭矩传递的系统， ），其可旋转地适于通过放置在它们之间的液体膜来传递扭矩。 离合器（26）可操作以改变从马达（12）传递到篮（22）的转矩，以产生将施加到马达（12）以提供篮的期望速度的最大负载。 为了由此启动分别与发动机（12）上的瞬时负载和筐（22）上的瞬时负载成比例的信号的离合器（26）和分别表示施加到发动机的最大负载的参考信号 （12）和期望的运行速度进行比较，以获得表示在最大负载下施加到马达（12）的当前负载的瞬时关系的结果信号。 然后启动离合器（26）以响应于所产生的信号而改变通过离合器部件（44）和（50）之间的液膜传输的转矩，以产生最大负载。

公开(公告)号：WO1993020947A1

公开(公告)日：1993-10-28

申请号：PCT/DK1993000124

申请日：1993-04-05

Applicant: ALFA-LAVAL SEPARATION A/S ,  NIELSEN, Helmuth, K. ,  CHRISTENSEN, Mogens

Inventor： ALFA-LAVAL SEPARATION A/S

IPC: B04B09/10

CPC classification number: B04B15/06 ,  B04B1/2016 ,  B04B2001/2025

Abstract: The centrifuge has an electric motor (18) of the squirrel cage type for the rotation of the centrifuge drum (2) during centrifugation and an electric control (20) comprising a frequency converter (21) for the control of the RPM of the electric motor (18). When cleaning the drum (2) a frequency converter (21) is coupled into the normal current supply line (25) to the electric motor (18) by means of two change-over switches (22, 23). The nominal power of the frequency converter corresponds to the power consumption of the electric motor (18) when the centrifuge drum (2) rotates at a speed corresponding to the centrifugal force at the internal side of the drum (2) being 1.2 to 0.8 times the gravitational force.

Abstract translation: 离心机具有用于在离心过程中离心机转鼓（2）旋转的鼠笼型电动机（18）和包括用于控制电动机的RPM的变频器（21）的电控制器（20） （18）。 当清洁滚筒（2）时，变频器（21）通过两个转换开关（22,23）耦合到电动机（18）的正常供电线路（25）中。 变频器的额定功率对应于当离心机鼓（2）以与鼓（2）内侧的离心力相对应的速度旋转的电动机（18）的功率消耗为1.2至0.8倍 重力。

公开(公告)号：WO1988009217A1

公开(公告)日：1988-12-01

申请号：PCT/US1988001426

申请日：1988-05-02

Applicant: BECKMAN INSTRUMENTS, INC.

Inventor： BECKMAN INSTRUMENTS, INC. ,  GIEBELER, Robert

IPC: B04B09/10

CPC classification number: B04B13/003 ,  B04B9/10 ,  Y10S388/903 ,  Y10S388/904 ,  Y10S388/93 ,  Y10S388/933

Abstract: An apparatus and method of protecting a centrifuge from rotor overspeed and resultant mishap by computation of the rotor moment of inertia is disclosed. In the preferred embodiment, a centrifuge is driven by a rotor (10) mounted on a shaft (14) which shaft is in turn driven by a constant current motor (16). A tachometer (20) for detecting angular velocity of the drive shaft is used. A desired and ultimate centrifuge operating speed is selected by the operator. The times at which the rotor passes through discrete speeds are recorded and from the time difference the moment of inertia is computed. The moment of inertia can thereafter be utilized to discretely identify or ''finger print'' rotors to disqualify certain rotors from use in particular centrifuge protocols and establish gross limits of centrifuge operating speed.