RU2472243C1 - Method to control double-coil electromagnetic motor of impact effect - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: electric drive comprises a working tool (1), a striker (2), a magnetic conductor (3) of an operating motion coil (4), a magnetic conductor (5) of a reverse motion coil (6) and a buffer (7). The working cycle of an electric drive of reciprocal motion consists in feeding first two half-waves of supply voltage to the reverse motion coil, the third pulse is sent to the operating motion coil. The reverse motion is carried out under impact of the first half-wave, and the operating motion is carried out under action of two other voltage half-waves. The next working cycle is repeated without omissions of supply voltage half-waves. Therefore impact power increase is achieved due to increased frequency of striker strokes, related to absence of a pause in a working cycle, with preservation of single impact energy.

EFFECT: increased impact power of electromagnetic motors.

2 dwg

Description

The invention relates to electrical engineering and can be used in percussion devices with a linear electromagnetic motor, in which the striker (armature) is driven by working and return coils and a buffer device consisting of a spring-loaded inertial mass.

A known method of controlling a two-coil electromagnetic shock motor, consisting in alternately applying pulses of supply voltage to the coils of the electromagnetic motor with an interval of time between them [a.c. 959250 USSR, M.C. H02P 7/62. The way to control the electromagnetic motor of the reciprocating motion / D.N. Malikov, N.P. Ryashentsev, E.M. Timoshenko, I.M. Korolev, A.N. Antonov. - No. 1740416 / 24-07; declared 01/21/72; publ. 09/15/82, Bull. No. 34]. An increase in impact power with this control method is achieved by supplying voltage pulses with a period of at least the total time of the armature working and returning.

The disadvantage of this control method is the low impact power, due to the lowering frequency of the pulses to the coil of the working and return stroke relative to the frequency of the supply voltage.

A known method of supplying a two-coil electromagnetic motor of reciprocating action, used in the drive of percussion machines [a.s. 1403327 USSR, M.C. H02P 7/62. The method of supplying an electromagnetic motor of reciprocating action / V.N. Ryashentsev, N.P. Ryashentsev, A.N. Ryashentsev. - No. 3511325 / 24-07; declared 12.11.82; publ. 06/15/88, bull. No. 22]. The working cycle with this control method is carried out by supplying pulses of supply voltage to the working and return coils with a pause during which the striker moves without exposure to electromagnetic forces. The increase in the specific shock power of the electromagnetic motor is achieved by connecting the motor coil to the power source for a time shorter than the duration of the striker under the action of the forces created by this coil. The coil is disconnected from the power source before the brisk passage of half the stroke.

The disadvantage of this method is the relatively low impact power associated with the supply of the working and return coils only during acceleration of the striker.

These disadvantages are partially eliminated in the method of controlling a two-coil electromagnetic motor [a.s. 1525856 USSR, M.C. H02P 7/62. A way to control a two-coil electromagnetic engine / A.A. Periev, E.M. Timoshenko, A.L. Osokin, V.M. Borisov. - No. 4104981 / 24-07; declared 05/30/86; publ. 11/30/89, Bull. No. 44], which is closest to the essence of the invention and is its prototype. The control method consists in the fact that during the duty cycle of the electromagnetic motor two pulses of the supply voltage are supplied to the coil of the working stroke, and one pulse to the coil of the reverse stroke, and each subsequent duty cycle is repeated after a pause equal to the transit time of one half-wave of the supply voltage.

The increase in shock power in this control method is achieved through the use of three half-waves of voltage per cycle for supplying the working and return coils, which leads to an increase in the energy of a single striker.

However, this method of controlling a two-coil electromagnetic motor develops a relatively low impact power. The disadvantage of the control method is the presence of a dead time pause, during which the movement of the striker is carried out only under the influence of its internal kinetic energy.

The task of the invention is to increase the shock power of an electromagnetic motor by increasing the frequency of strikes of the striker.

This task is achieved by alternately supplying three half-waves of supply voltage for the working cycle, the first two half-waves of the supply voltage are fed to the reverse coil, and the third half-wave is fed to the working coil, with the repetition of the indicated sequence of supplying half-waves of voltage without a pause between cycles.

Figure 1 shows a two-coil electromagnetic engine that implements the proposed method; figure 2 presents the timing diagrams of the duty cycle.

The engine (figure 1) consists of a working tool 1, striker 2, magnetic circuit 3 of the coil of the working stroke 4, magnetic circuit 5 of the reverse coil 6 and the buffer 7.

The control method of a two-coil electromagnetic motor is carried out in such a way that three half-waves of supply voltage are supplied for the duty cycle. The first two half-waves of voltage are supplied to the reverse coil, the third half-wave of voltage is supplied to the coil of the working stroke, and under the action of the first half-wave of voltage, the reverse stroke is made, and under the action of the other two half-waves of voltage, the working stroke. Next, the cycle is repeated without omissions of half-waves of the supply voltage.

Figure 2 presents the timing diagrams of the operating cycles of the engine, where U _pit is the voltage of the supply network; U _oh - voltage reverse coil; U _px is the voltage of the working coil, x is the striker stroke (the bottom point of the line is the striker position at the moment of impact, the top is the striker position at the end of the reverse stroke).

At the initial time, the firing pin is in the leftmost position. At time t ₁ , power is supplied to the reverse coil 6, the striker 2, under the action of the electromagnetic forces of the reverse coil 6, begins to move towards the buffer device 7, makes a blow to it and bounces. At time t ₂ , the second half-wave of voltage is supplied to the reverse coil 6, as a result of which the firing pin receives additional acceleration in the direction of movement to the working tool. At time t ₃ , power is supplied to the travel coil 5, which creates a force acting on the striker until it hits the working tool 1. Then, the striker bounces off the tool and the supply voltage is repeated.

Thus, an increase in shock power is achieved by increasing the frequency of strikes of the striker, associated with the absence of a pause in the duty cycle, while maintaining a unit energy of impact of the engine.

Claims (1)

A control method for a two-coil electromagnetic motor, which consists in alternately supplying three half-waves of supply voltage for the working cycle, characterized in that the first two half-waves are fed to the reverse coil, and the third half-wave is fed to the working coil with repeating the indicated sequence of supplying half-waves of voltage without a pause between cycles .

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