JPH0653236B2 - Centrifuge control method - Google Patents

Description

The present invention relates to a control method during acceleration of a centrifuge.

[Conventional technology]

FIG. 2 is a block diagram of a conventional centrifuge. In FIG. 2, 1 is a motor, 2 is a rotating body driven by the motor 1, 3 is a chamber for accommodating the rotating body 2, 4 is a cooling pipe provided on the outer periphery of the motor 1, and 5 is provided on the outer periphery of the chamber 3. Cooling pipe, 6 is a first refrigerator for cooling the motor 1 by passing the refrigerant through the cooling pipe 4, and 7 is a second refrigerator for cooling the rotating body 2 in the chamber 3 by passing the refrigerant through the cooling pipe 5. so,
The operations of these two refrigerators are controlled so that the temperatures of the motor 1 and the rotating body 2 become a predetermined temperature.

FIG. 3 is a block diagram showing the electrical configuration of a conventional centrifuge. In FIG. 3, 8 is an arithmetic processing unit, 9 is an input interface, 10 is an output interface, 1
Reference numeral 1 is a memory, and 12 is a start switch. During the operation of the centrifuge, the temperatures of the motor 1 and the rotating body 2 in the chamber 3 are input via the input interface 9, which are compared with the reference value from the memory 11 and the deviation value is calculated by the arithmetic processing unit 8. The output signal is transmitted to the first refrigerator 6 and the second refrigerator 7 via the output interface 10. Thus,
These refrigerators are on / off controlled by the above output signals, and the temperatures of the motor 1 and the rotating body 2 are controlled to a predetermined temperature.

FIG. 4 is a control characteristic diagram of a conventional centrifuge. The centrifuge is designed to accelerate the maximum torque of the motor in the shortest time in order to efficiently separate the sample. Fourth
In the figure, A shows the change in the number of revolutions of the motor 1 during acceleration / deceleration, and B and C show the waveforms of the input voltage of the first refrigerator 6 and the second refrigerator 7.

In the conventional method of controlling a centrifuge, the motor 1 and the first and second refrigerators 6 and 7 are all in the operating state during operation as shown in the figure, and the motor current sharply increases during acceleration. The problem of the power supply capacity of the centrifuge was not taken into consideration.

[Problems to be solved by the invention]

At the time of acceleration, a large amount of motor current flows, and on the other hand, the current also flows to the cooler, which increases the power supply capacity and raises the cost. On the other hand, if an existing power supply device is used, the capacity of the power supply becomes a problem, and the inconvenience that the motor current must be suppressed may occur.

It is an object of the present invention to provide a method for controlling a centrifuge, which can reduce the power supply capacity of the centrifuge and reduce the cost.

[Means for solving problems]

The above-mentioned problems can be solved by stopping the power supply to the first and second refrigerators after the motor is started and before reaching a predetermined rotation speed.

[Action]

In the present invention, the power supply to the first and second refrigerators is stopped after the motor is started until the rotation speed reaches a predetermined value. It becomes possible to obtain a sufficient acceleration torque even when the existing power supply device is used by relaxing the peak of No.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

However, the method of controlling the centrifuge according to the present embodiment uses the equipment configuration described in the section “Prior Art” based on FIGS. 2 and 3 as it is.

In the figure, the centrifuge according to the present invention enters the operating state by turning on the start switch 12, the temperature of the rotating body 2 is compared with the reference value in the memory 11, and the second refrigerator 7 is operated, It is controlled so as to reach a predetermined temperature.

FIG. 1 is a control characteristic diagram of the centrifuge according to this embodiment.
Represents changes in the number of rotations of the motor 1 during acceleration / deceleration, and B and C represent the first refrigerator 6 and the second refrigerator 7.
The waveform of the input voltage of is shown.

As shown in FIG. 1B, the first for cooling the motor 1
The refrigerator 6 is not driven before the motor 1 is started.
This is because the temperature of the motor 1 does not rise before starting the motor 1. Therefore, when the first refrigerator 6 is driven after reaching a predetermined rotation speed, it is possible to reduce the peak of power consumption associated with the sudden acceleration at the time of startup.

Further, as shown in FIG. 1C, the second refrigerator 7 for cooling the rotating body 2 is driven before the motor 1 is started. This is to lower the temperature of the rotating body 2 to a predetermined temperature before starting the motor and then rotate the rotating body 2. Therefore, the power supply to the second refrigerator 7 is stopped at the same time when the motor 1 is started, and then the power supply is started after the predetermined number of rotations is reached, so that the power consumption due to the rapid acceleration at the time of startup is reduced. It becomes possible to relax the peak.

As described above, according to the present embodiment, since the power supply capacity can be smaller than the conventional one, not only the cost can be reduced but also sufficient acceleration torque can be obtained even when the existing power supply device has a problem in the capacity. Become.

〔The invention's effect〕

By using the method for controlling a centrifuge according to the present invention, the power supply capacity of the centrifuge can be made smaller than before, and the cost can be reduced.

[Brief description of drawings]

1 is a control characteristic diagram of a centrifuge according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a conventional centrifuge, and FIG. 3 is a block diagram showing an electrical configuration of a conventional centrifuge. FIG. 4 is a control characteristic diagram of a conventional centrifuge. 1 is a motor, 2 is a rotating body, 6 is a first refrigerator, and 7 is a second
It is a refrigerator.

Claims (1)

[Claims] 1. A centrifuge having a motor, a rotating body driven by the motor, a first refrigerator for cooling the motor, and a second refrigerator for cooling the rotating body. A method for controlling a centrifuge, characterized in that in the machine, power supply to the first and second refrigerators is stopped after the motor is started until a predetermined number of rotations is reached.