CN203301406U - Novel dynamic braking circuit - Google Patents

Abstract

The utility model discloses a novel dynamic braking circuit, comprising a breaker QF, a main contactor KM1, a thermal relay FR1, a stop button SB1, a start button SB2, a rectifier bridge D1, a braking torque regulating circuit, and a braking time regulating circuit. three-phase AC power lines are connected with three input ends of a three-phase motor M through the breaker QF, first normally-open contacts KM1-1 of the main contactor KM1, and a coil of the thermal relay FR1 in sequence. The braking torque regulating circuit comprises a potentiometer RP, a capacitor C1, a SCR VS, and a voltage-stabilizer tube VZ. The braking time regulating circuit comprises an adjustable capacitor C2, an intermediate relay KA1, a resistor R, and a rectifier diode VD. A problem of braking torque regulation of the dynamic braking circuit is solved. Through cooperation of the potentiometer RP and the adjustable capacitor C2, optimal braking effect can be obtained, so that adaptability of the dynamic braking circuit is better.

Description

A kind of novel energy-dissipating brake circuit

Technical field

The utility model relates to the circuit for controlling motor of electric equipment, is specifically related to a kind of be used to controlling the novel energy-dissipating brake circuit of motor.

Background technology

The braking of threephase asynchronous is divided three classes usually, i.e. mechanical braking, plug braking and dynamic braking.As shown in Figure 1, its brake torque is by transformer T realization for typical energy-dissipating brake circuit, and braking time is regulated and solved by time relay KT1, and the shortcoming that this circuit exists is: its brake torque is non-adjustable, for different loads, need design different braking circuits.

The utility model content

But the technical problems to be solved in the utility model is to provide the novel energy-dissipating brake circuit that a kind of brake torque wide region is regulated.

For solving the problems of the technologies described above, technical solution adopted in the utility model is: a kind of novel energy-dissipating brake circuit comprises circuit breaker Q F, main contactor KM1, thermal relay FR1, stop button SB1, start button SB2, rectifier bridge D1, brake torque regulating circuit and braking time regulating circuit; Three-phase ac power cord is connected on three inputs of three phase electric machine M through the coil of the first normally opened contact KM1-1, the thermal relay FR1 of circuit breaker Q F, main contactor KM1 successively; Described brake torque regulating circuit is comprised of potentiometer RP, capacitor C 1, controllable silicon VS and voltage-stabiliser tube VZ; Described braking time regulating circuit is comprised of tunable capacitor C2, auxiliary relay KA1, resistance R and rectifier diode VD;

Described stop button SB1 is attempted by on the two-phase of three-phase ac power cord successively with after the normally-closed contact FR1-1 of the coil of the first normally-closed contact KA1-1, the start button SB2 of auxiliary relay KA1, main contactor KM1 and thermal relay FR1 connects, and the second normally opened contact KM1-2 of main contactor KM1 is in parallel with start button SB2;

input of described rectifier bridge D1 be connected on one of three-phase ac power cord after the 4th normally opened contact KA1-4 of auxiliary relay KA1 connects and go up mutually, its another input is connected on zero line, the anode of the output termination controllable silicon VS of described rectifier bridge D1, the negative electrode of controllable silicon VS successively with the second normally opened contact KA1-2 of auxiliary relay KA1, rectifier diode VD, resistance R, after the 4th normally opened contact KM1-4 of main contactor KM1 and tunable capacitor C2 series connection, be connected on zero line, the second normally opened contact KA1-2 of auxiliary relay KA1 and the node of rectifier diode VD connect the input of three phase electric machine M, another output of rectifier bridge D1 and another input that meets three phase electric machine M after the 3rd normally opened contact KA1-3 of auxiliary relay KA1 connects, capacitor C 1 is in parallel with controllable silicon VS after with potentiometer RP, connecting, the control utmost point of controllable silicon VS and the node that meets capacitor C 1 and potentiometer RP after voltage-stabiliser tube VZ connects, the coil of auxiliary relay KA1 is in parallel with tunable capacitor C2 after with the 3rd normally-closed contact KM1-3 of main contactor KM1, connecting.

The beneficial effect that adopts technique scheme to produce is:

The utility model uses potentiometer RP, capacitor C 1, controllable silicon VS and voltage-stabiliser tube VZ to form the brake torque regulating circuit, replace the transformer T in primary circuit, the angle of flow of regulating controllable silicon VS by potentiometer RP carrys out the size of adjustable brake electric current, thereby has realized the adjustable of brake torque; Use tunable capacitor C2, auxiliary relay KA1, resistance R and rectifier diode VD to form the braking time regulating circuit, replace the time relay KT1 in former loop, by the capacity of regulating tunable capacitor C2, carry out the adjustable brake time, realize the adjustable of braking time.

The utility model has solved the brake torque of energy-dissipating brake circuit can regulate problem, by the cooperation of potentiometer RP and tunable capacitor C2, can obtain best braking effect, makes the adaptability of energy-dissipating brake circuit stronger.

The accompanying drawing explanation

Fig. 1 is typical energy-dissipating brake circuit figure;

Fig. 2 is circuit diagram of the present utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.

As shown in Figure 2, the utility model is a kind of novel energy-dissipating brake circuit, comprises circuit breaker Q F, main contactor KM1, thermal relay FR1, stop button SB1, start button SB2, rectifier bridge D1, brake torque regulating circuit 1 and braking time regulating circuit 2; Three-phase ac power cord L1, L2, L3 are connected on three inputs of three phase electric machine M through the coil of the first normally opened contact KM1-1, the thermal relay FR1 of circuit breaker Q F, main contactor KM1 successively; Fuse FU1 also is installed on three-phase ac power cord L1, L2, L3; Brake torque regulating circuit 1 is comprised of potentiometer RP, capacitor C 1, controllable silicon VS and voltage-stabiliser tube VZ; Braking time regulating circuit 2 is comprised of tunable capacitor C2, auxiliary relay KA1, resistance R and rectifier diode VD.

In Fig. 2, stop button SB1 is attempted by on the two-phase of three-phase ac power cord successively with after the normally-closed contact FR1-1 of the coil of the first normally-closed contact KA1-1, the start button SB2 of auxiliary relay KA1, main contactor KM1 and thermal relay FR1 connects, and the second normally opened contact KM1-2 of main contactor KM1 is in parallel with start button SB2.

in Fig. 2, input of rectifier bridge D1 be connected on one of three-phase ac power cord after the 4th normally opened contact KA1-4 of auxiliary relay KA1 connects and go up mutually, on this input of rectifier bridge D1, fuse FU2 also is installed, another input of rectifier bridge D1 is connected on zero line, the anode of the output termination controllable silicon VS of rectifier bridge D1, the negative electrode of controllable silicon VS successively with the second normally opened contact KA1-2 of auxiliary relay KA1, rectifier diode VD, resistance R, after the 4th normally opened contact KM1-4 of main contactor KM1 and tunable capacitor C2 series connection, be connected on zero line, the second normally opened contact KA1-2 of auxiliary relay KA1 and the node of rectifier diode VD connect the input of three phase electric machine M, another output of rectifier bridge D1 and another input that meets three phase electric machine M after the 3rd normally opened contact KA1-3 of auxiliary relay KA1 connects, capacitor C 1 is in parallel with controllable silicon VS after with potentiometer RP, connecting, the control utmost point of controllable silicon VS and the node that meets capacitor C 1 and potentiometer RP after voltage-stabiliser tube VZ connects, the coil of auxiliary relay KA1 is in parallel with tunable capacitor C2 after with the 3rd normally-closed contact KM1-3 of main contactor KM1, connecting.

Operation principle of the present utility model: press the start button SB2 in Fig. 2, main contactor KM1 adhesive self-locking, the 4th normally opened contact KM1-4 adhesive of main contactor KM1, the 3rd normally-closed contact KM1-3 disconnect, contact (3#), (4#) are charged, and tunable capacitor C2 charges through the 4th normally opened contact KM1-4, the contact (5#) of contact (3#), main contactor KM1; During shutdown, press stop button SB1; the main contactor KM1 release of cutting off the power supply; the 4th normally opened contact KM1-4 of main contactor KM1, the 3rd normally-closed contact KM1-3 adhesive; tunable capacitor C2 is through the coil discharge of auxiliary relay KA1; auxiliary relay KA1 adhesive simultaneously; auxiliary relay KA1 the second normally opened contact KA1-2, the 3rd normally opened contact KA1-3 are all closed; the coil of three phase electric machine M is supplied with direct current and is braked by contact (3#), (4#), and the length of braking time is by the Time dependent of tunable capacitor C2 through the coil discharge of auxiliary relay KA1.

Claims (1)

1. a novel energy-dissipating brake circuit, comprise circuit breaker Q F, main contactor KM1, thermal relay FR1, stop button SB1, start button SB2, rectifier bridge D1, brake torque regulating circuit (1) and braking time regulating circuit (2); Three-phase ac power cord is connected on three inputs of three phase electric machine M through the coil of the first normally opened contact KM1-1, the thermal relay FR1 of circuit breaker Q F, main contactor KM1 successively; It is characterized in that: described brake torque regulating circuit (1) is comprised of potentiometer RP, capacitor C 1, controllable silicon VS and voltage-stabiliser tube VZ; Described braking time regulating circuit (2) is comprised of tunable capacitor C2, auxiliary relay KA1, resistance R and rectifier diode VD;

Described stop button SB1 is attempted by on the two-phase of three-phase ac power cord successively with after the normally-closed contact FR1-1 of the coil of the first normally-closed contact KA1-1, the start button SB2 of auxiliary relay KA1, main contactor KM1 and thermal relay FR1 connects, and the second normally opened contact KM1-2 of main contactor KM1 is in parallel with start button SB2;

input of described rectifier bridge D1 be connected on one of three-phase ac power cord after the 4th normally opened contact KA1-4 of auxiliary relay KA1 connects and go up mutually, its another input is connected on zero line, the anode of the output termination controllable silicon VS of described rectifier bridge D1, the negative electrode of controllable silicon VS successively with the second normally opened contact KA1-2 of auxiliary relay KA1, rectifier diode VD, resistance R, after the 4th normally opened contact KM1-4 of main contactor KM1 and tunable capacitor C2 series connection, be connected on zero line, the second normally opened contact KA1-2 of auxiliary relay KA1 and the node of rectifier diode VD connect the input of three phase electric machine M, another output of rectifier bridge D1 and another input that meets three phase electric machine M after the 3rd normally opened contact KA1-3 of auxiliary relay KA1 connects, capacitor C 1 is in parallel with controllable silicon VS after with potentiometer RP, connecting, the control utmost point of controllable silicon VS and the node that meets capacitor C 1 and potentiometer RP after voltage-stabiliser tube VZ connects, the coil of auxiliary relay KA1 is in parallel with tunable capacitor C2 after with the 3rd normally-closed contact KM1-3 of main contactor KM1, connecting.

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