KR20030002555A - Driving comtrol apparatus for reciprocating compressor - Google Patents

Abstract

PURPOSE: A system for controlling operation of reciprocating compressor is provided to improve stability of the system. CONSTITUTION: A system includes a flywheel part(100) converting voltage impressed to an inside motor into rotary kinetic energy of a flywheel to store and converting the kinetic energy into electric energy to impress to an electric circuit part(10) in a moment when needed by flywheel control signal; a reciprocating compression part(L.COMP) controlling cooling force by varying stroke with vertical movement of a piston by voltage impressed to a motor(M) according to stroke instruction value; and a microcomputer(40) calculating stroke based on voltage and current detected in the reciprocating compression part, comparing the stroke with the stroke instruction value to output corresponding switching control signal and outputting flywheel control signal controlling energy storage and output of the flywheel part.

Description

Driving control device of reciprocating compressor {DRIVING COMTROL APPARATUS FOR RECIPROCATING COMPRESSOR}

The present invention relates to an operation control device for a reciprocating compressor, and more particularly, to a control device for a reciprocating compressor employing a flywheel unit, which is an energy storage device, to improve the stability of a system by using stored electric energy when necessary. It is about.

In general, a reciprocating compressor generates a torque by interrupting the power supplied to a coil wound around a multi-phase stator by using a switching element. By sequentially changing the excitation state between the rotor and the stator, The forward rotational torque can be generated by the suction force.

If the specific excitation state is not changed, the rotor can be stopped at a predetermined position, and various drive control that can generate reverse power by controlling the phase of the input pulse signal applied to the switching element based on the maximum inductance shape. As it is possible, it is applied to electronic products requiring direction control.

In particular, the reciprocating compressor used in the refrigerator or the air conditioner can vary the compression ratio by the voltage applied to the motor, and thus has the advantage of controlling the cooling power according to the user's intention. It will be described in detail with reference to one drawing.

1 is a block diagram showing a configuration of an operation control device of a general reciprocating compressor. As shown in FIG. 1, the piston changes the stroke in vertical motion by the voltage applied to the internal motor according to the stroke command value. A reciprocating compression unit (L.COMP) for adjusting; A voltage detector (30) which detects a voltage generated in the reciprocating compression section (L.COMP) as the stroke is increased by an applied voltage; A current detector 20 which detects a current applied to the reciprocating compressor L.COMP as the stroke is increased by an applied voltage; A microcomputer (40) for calculating a stroke from the voltage and current detected by the voltage detector (30) and the current detector (20), comparing the stroke with a stroke command value, and outputting a switching control signal accordingly; In accordance with the switching control signal of the microcomputer 40, it consists of an electrical circuit section 10 for interrupting the AC power to the triac (Tr1) to apply a voltage to the reciprocating compression section (L.COMP), and thus The operation of the conventional apparatus will be described.

First, the reciprocating compression section (L.COMP), the piston is moved up and down by the applied voltage according to the stroke command value set by the user, thereby the stroke is variable to adjust the cooling force.

Meanwhile, the stroke of the triac Tr1 of the electric circuit unit 10 is increased due to a long turn-on period due to the switching control signal of the microcomputer 40, wherein the motor M of the reciprocating compressor L.COMP is increased. The voltage and the current applied to the) are detected by the voltage detector 30 and the current detector 20, and applied to the microcomputer 40.

Then, the microcomputer 40 calculates a stroke using the applied voltage and current detected from the voltage detector 30 and the current detector 20, and compares the stroke with the stroke command value and accordingly switches the control signal. Outputs

That is, when the calculated stroke is smaller than the stroke command value, the microcomputer 40 outputs a switching control signal for lengthening the on-cycle of the triac Tr1, thereby converting the voltage applied to the reciprocating compressor L.COMP. Increase.

Unlike the above, when the calculated stroke is larger than the stroke command value, the microcomputer 40 outputs a switching control signal for shortening the on-cycle of the triac Tr1 and is applied to the reciprocating compression unit L.COMP. Reduce the voltage.

Here, the relationship between the voltage applied to the motor (M) and the stroke is expressed as a formula.

Here, α is a motor constant that converts an electrical force into a mechanical force, S is a stroke, R is a motor internal resistance, and L is an inductance of the motor M itself.

The inductance voltage ( ) Is the counter electromotive force ( Almost similar to), and the voltage caused by the internal resistance (R) Is the inductance voltage ( ) And back EMF ( It is negligible compared to).

Therefore, the voltage V applied to the motor M is the inductance voltage ( ) And back EMF ( And the voltage V applied to the motor must be large in order to generate the required stroke.

At this time, the reciprocating compressor operating as described above, the operation is stopped when the power supply to the system is interrupted in the event of an accident such as a power failure, there is a problem that the system becomes unstable.

The present invention has been made in order to solve the above problems, after using the flywheel unit of the energy storage device to convert the surplus electrical energy to the rotational kinetic energy of the flywheel and stored, when the power supply is stopped due to an accident such as a power failure It is an object of the present invention to provide an operation control device for a reciprocating compressor that outputs instantaneously as electrical energy to improve the stability of the system.

Figure 1 is a block diagram showing the configuration for the operation control device of a typical reciprocating compressor.

Figure 2 is a block diagram showing the configuration of the operation control device of the reciprocating compressor of the present invention.

** Explanation of symbols for main parts of drawings **

10: electric circuit unit 20: current detection unit

30: voltage detector 40: microcomputer

100: flywheel part

The present invention for achieving the above object by the voltage applied to the internal motor, the reciprocating compression unit by controlling the reciprocating compression unit and the AC power to control the cooling force by varying the stroke in the vertical movement of the piston to triac the reciprocating compression In an operation control apparatus of a reciprocating compressor including an electric circuit unit for applying a voltage to a negative motor, a flywheel control signal converts a voltage applied to an internal motor into rotational kinetic energy of a flywheel and stores the electrical energy if necessary. A flywheel part which is converted into and instantaneously applied to the electric circuit part; A reciprocating compression section (L.COMP) for adjusting the cooling force by varying the stroke in vertical movement by the voltage applied to the internal motor according to the stroke command value; The stroke is calculated from the voltage and current detected by the reciprocating compressor L.COMP, and the stroke is compared with the stroke command value to output a switching control signal according to the stroke command value, and to control the energy storage and output of the flywheel unit. And a microcomputer for outputting a flywheel control signal.

Hereinafter, with reference to the accompanying drawings, the operation and effect of the operation control apparatus of the reciprocating compressor according to the present invention will be described in detail.

Figure 2 is a circuit diagram showing the configuration of the operation control device of the reciprocating compressor of the present invention, by converting the voltage applied to the internal motor to the rotational kinetic energy of the flywheel by the flywheel control signal as shown here, A flywheel unit 100 that converts the electric energy into time and instantaneously applies it to the electric circuit unit 10; A reciprocating compression section (L.COMP) for adjusting the cooling force by varying the stroke in vertical movement by the voltage applied to the internal motor according to the stroke command value; A voltage detector (30) which detects a voltage generated in the reciprocating compression section (L.COMP) as the stroke is increased by an applied voltage; A current detector 20 which detects a current applied to the reciprocating compression section L.COMP as the stroke is increased by an applied voltage; The stroke is calculated from the voltage and current detected by the voltage detector 30 and the current detector 20, the stroke is compared with the stroke command value, and the switching control signal is outputted accordingly, and the energy of the flywheel unit 100 is also calculated. A microcomputer 40 for outputting a flywheel control signal for controlling storage and output; In accordance with the switching control signal of the microcomputer 40, the AC power to the triac (Tr1) to control the electric circuit section 10 for applying a voltage to the reciprocating compression section (L.COMP), such as The operation of the present invention will be described.

First, the reciprocating compression section (L.COMP), the piston is moved up and down by the applied voltage according to the stroke command value set by the user, thereby the stroke is variable to adjust the cooling force.

Meanwhile, the stroke of the triac Tr1 of the electric circuit unit 10 is increased due to a long turn-on period due to the switching control signal of the microcomputer 40, wherein the motor M of the reciprocating compressor L.COMP is increased. The voltage and the current applied to the) are detected by the voltage detector 30 and the current detector 20, and applied to the microcomputer 40.

Then, the microcomputer 40 calculates a stroke using the applied voltage and current detected from the voltage detector 30 and the current detector 20, and compares the stroke with the stroke command value and accordingly switches the control signal. Outputs

Here, the present invention further comprises a flywheel unit 100 for converting and storing the electrical energy applied to the motor to the rotational kinetic energy of the flywheel, the electrical energy stored in the flywheel unit 100 at the time of an accident such as a power failure To drive the system using, a description will be given of such an operation.

First, the microcomputer 40 applies a flywheel control signal for storing electrical energy to the flywheel unit 100 to the flywheel unit 100, and then the flywheel unit 100 is switched to the charging mode, and the motor The applied electric energy is stored as the rotational kinetic energy of the flywheel, that is, the flywheel motor is rated at a small current to store the electric energy as the flywheel rotational kinetic energy.

In this case, the microcomputer 40 detects when the electric energy is sufficiently stored in the flywheel unit 100 and applies a flywheel control signal according thereto, whereby the flywheel unit 100 is switched to the float mode. Maintain the maximum power while maintaining the speed of the flywheel motor with very little current.

If the power supply is stopped due to an accident such as a power failure, by the flywheel control signal of the microcomputer 40, the flywheel unit 100 is switched to the discharge mode to supply power to the electric circuit unit 10 to reciprocate. It will continue to drive the dynamic compression unit (L.COMP).

As described in detail above, the present invention, in driving a reciprocating compressor which is a cryogenic refrigerant compressor for communication equipment, converts and stores surplus electric energy into rotational kinetic energy of a flywheel, and supplies power due to an accident such as a power failure. When stopped, there is an effect of stably operating the system by instantaneous output with electrical energy.

Claims (2)

By the voltage applied to the internal motor, the reciprocating compression unit for varying the stroke by the vertical movement of the piston to control the cooling power and the electric circuit section for applying voltage to the motor of the reciprocating compression unit by intermittent AC power to triac In the operation control device of a reciprocating compressor, A flywheel unit for converting and storing the voltage applied to the internal motor into the rotational kinetic energy of the flywheel by the flywheel control signal, and converting it into electric energy if necessary and applying it to the electric circuit at once; A reciprocating compression section (L.COMP) for adjusting the cooling force by varying the stroke in vertical movement by the voltage applied to the internal motor according to the stroke command value; The stroke is calculated from the voltage and current detected by the reciprocating compression unit (L.COMP), the stroke is compared with the stroke command value, and the switching control signal is outputted accordingly, and the energy storage and output of the flywheel unit is controlled. An operation control apparatus for a reciprocating compressor comprising a microcomputer for outputting a flywheel control signal. The flywheel unit of claim 1, wherein the flywheel motor is rated at a small amount of electric current by the flywheel motor during charging, and maintains the speed of the flywheel motor with a small amount of current while maintaining the maximum power in the float mode. Operation control apparatus for a reciprocating compressor, characterized in that to supply power to drive the reciprocating compressor.