Novel star-delta motor starting system

Abstract

The utility model discloses a novel star-delta motor starting system, and belongs to the technical field of motor starting. The system is composed of two circuits, and specifically comprises a star-delta starting motor system main circuit and a frequency converter starting motor system main circuit. A newly-designed star-delta and frequency converter combined motor starting control system is utilized, a frequency converter control circuit is adopted to start a motor to operate under the normal condition, and when the frequency converter breaks down and stops working, the star-delta control circuit can be directly switched to start the motor to operate under the condition that the frequency converter is not used for starting. And after the frequency converter is overhauled, the star-delta control circuit is stopped, and the frequency converter control circuit is directly switched to start the motor to operate. In the whole starting process, the motor can be quickly switched only by operating the button, the switching is quick and safe, and the operation is simple and convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor starting technical field, concretely relates to a novel star-delta motor starting system. BACKGROUND

[0002] The crusher of the heat supply workshop is one of the main equipment commonly used in the metal smelting plant, and the motor starting system of the crusher adopts the traditional star-delta starting mode, the starting mode is relatively universal and inexpensive in the application of the high-power motor starting system. However, the traditional star-delta starting circuit must realize the control function by buttons, contactors and time relays and other elements, that is, the number and types of elements in the circuit configuration are more, and the starting time is longer, and the starting procedure is more cumbersome, sometimes leading to the smaller torque of the motor after starting, seriously affecting the working efficiency of the motor. Especially, the wiring of the star-delta starting control circuit and the installation of a large number of electrical devices such as contactors and relays must be completed by manual operation, and if a simple change is made after the wiring is completed, a lot of manpower and time must be spent to implement, and the contactors, relays and the like are operated under the conditions of long-term wear and fatigue, and are extremely easy to damage, and sometimes the temperature is too high to cause a large amount of arc on the contact of the relay, which is easy to cause misoperation. At the same time, the motor is easy to consume a large amount of electric energy and generate a large amount of heat and noise when starting under full load.

[0003] In view of the above problems, it is urgent to design a novel star-delta motor starting system, that is, to provide a motor starting system combining star-delta and frequency converter, which can not only solve the above various problems in the starting process of the crusher, but also greatly reduce the operation procedure of the operator, reduce the labor intensity of the personnel and improve the automation degree of the electrical control system of the equipment, and at the same time, the production efficiency and enterprise benefit of the equipment can be improved. The company designs a novel star-delta motor starting system taking the crusher of the heat supply workshop as an example. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a novel star-delta motor starting system, which realizes the rapid, safe and efficient starting of the crusher by using the frequency converter, greatly simplifies the configuration and starting procedure of the existing starting circuit, reduces the electric energy consumption and system safety hidden danger risk. Thus, the problems in the background technology are solved.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] The utility model provides a novel star-delta motor starting system, including introducing 380V three -phase power supply U, V, W phase, and installs the fuse FU to the protection of line, its characterized in that, the output of fuse FU connects the input of total circuit breaker QF I, the output of total circuit breaker QF I is connected with the input of branch circuit breaker QF II and branch circuit breaker QF III respectively, and the output of branch circuit breaker QF II and branch circuit breaker QF III is connected with the input of main contactor KM I and the input of frequency converter VFD respectively, the output of main contactor KM I is connected to the input of thermal relay FR I, the output of frequency converter VFD is connected to the input of frequency conversion alternating current contactor KM IV, the output of frequency conversion alternating current contactor KM IV is connected to the input of thermal relay FR II, and the output of thermal relay FR II and the output of thermal relay FR I are connected to the wiring terminal of crusher main motor M, star contactor KM III is connected to the wiring terminal U II, V II, W II of crusher main motor M, and delta contactor KM II is connected to the wiring terminal U I, V I, W I and U II, V II, W II of the front and back of crusher main motor M.

[0007] The control circuit of the starting system is composed of a star-delta starting motor system control circuit 31 and a frequency converter starting motor system control circuit 32.

[0008] The star-delta starting motor system control circuit 31 includes introducing 220V two-phase power supply U, N phase, and a group of thermal relay FR I normally closed contacts 1 are connected in series from the live wire U phase, the output of the thermal relay FR I normally closed contacts 1 is connected to the star-delta starting circuit stop button 2, the output of the star-delta starting circuit stop button 2 is connected to the star-delta starting circuit start button 3, a group of main contactor KM I normally open contacts 4 are connected in parallel on the star-delta starting circuit start button 3, the output of the star-delta starting circuit start button 3 is divided into 4 paths: the first path is connected to the frequency conversion alternating current contactor KM IV normally closed contact 5 and the main contactor KM I coil 6; the second path is connected to the delta contactor KM II normally closed contact 7, the time relay KT delay opening contact 8 and the star contactor KM III coil 9, and a group of time relay KT coil 10 are connected in parallel between the time relay KT delay opening contact 8 and the star contactor KM III coil 9; the third path is connected to the delta contactor KM II normally open contact 11, the star contactor KM III normally closed contact 12 and the delta contactor KM II coil 13, and a group of time relay KT delay closing contact 14 are connected in parallel between the delta contactor KM II normally open contact 11; the fourth path is connected to a group of star-delta starting circuit running indicator light 15.

[0009] The variable frequency starter motor system control circuit 32 is connected to the zero line N phase from the fire line U phase, and is branched into three paths: the first path is connected to a group of hot relays FR II normally closed contacts 16, the output end of the hot relays FR II normally closed contacts 16 is connected to a variable frequency starter circuit stop button 17, the output end of the variable frequency starter circuit stop button 17 is connected to a variable frequency starter circuit start button 18, a group of variable frequency alternating current contactors KM IV normally open contacts 22 are connected in parallel to the variable frequency starter circuit start button 18, the output end of the variable frequency starter circuit start button 18 is connected to a main contactor KM I normally closed contact 19 and a variable frequency alternating current contactor KM IV coil 20, and a group of variable frequency starter circuit running indicator lights 21 are connected in parallel to the main contactor KM I normally closed contact 19 and the variable frequency alternating current contactor KM IV coil 20; the second path is connected to a variable frequency starter circuit fault indicator light 25 and a variable frequency starter multifunctional relay output normally open contact 24, and a group of variable frequency relay normally open contacts 23 are connected in parallel to the variable frequency starter multifunctional relay output normally open contact 24; the third path is connected to a group of system control circuit power indicator lights 26.

[0010] The four output ends of the star-delta starter motor system control circuit 31 and the three output ends of the variable frequency starter motor system control circuit 32 are all connected to the zero line N phase, forming a closed loop.

[0011] In summary, due to the adoption of the above technical scheme, the beneficial effects of the utility model are:

[0012] The utility model discloses a motor starting control system combined with star-delta and variable frequency device, under normal circumstances, the motor is started by the variable frequency device control circuit, when the variable frequency device stops working due to failure, the motor can be directly switched to star-delta control circuit to start without using the variable frequency device. When the variable frequency device is repaired, the star-delta control circuit is stopped, and the motor is started by the variable frequency device control circuit. The whole starting process of the utility model can realize the quick switching of the motor by operating the button, which is quick, safe, simple and convenient.

[0013] In summary, the utility model can realize the improvement of the starting system of the crusher in the heating workshop by combining star-delta and variable frequency device, and solve the problems of long-term manual starting, complex starting process, long starting time, high equipment failure rate and inconvenient maintenance for maintenance personnel. The utility model has simple and understandable overall structure, convenient and easy operation, stable and safe running, saves a large number of electrical components, reduces energy loss and cost, improves the working efficiency of the equipment, and creates the profit and economic benefit value of the enterprise. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the electrical schematic diagram of the utility model;

[0015] Figure 2 The control circuit diagram of the utility model;

[0016] As shown in the figure: 1-thermal relay FR I normally closed contact; 2-star-delta starting circuit stop button; 3-star-delta starting circuit start button; 4-main contactor KM I normally open contact; 5-frequency conversion AC contactor KM IV normally closed contact; 6-main contactor KM I coil; 7-triangle contactor KM II normally closed contact; 8-time relay KT delay opening contact; 9-star contactor KM III coil; 10-time relay KT coil; 11-triangle contactor KM II normally open contact; 12-star contactor KM III normally closed contact; 13-triangle contactor KM II coil; 14-time relay KT delay closing contact; 15-star-delta starting circuit running indicator light; 16-thermal relay FR II normally closed contact; 17-frequency converter starting circuit stop button; 18-frequency converter starting circuit start button; 19-main contactor KM I normally closed contact; 20-frequency conversion AC contactor KM IV coil; 21-frequency converter starting circuit running indicator light; 22-frequency conversion AC contactor KM IV normally open contact; 23-frequency converter normally open contact EA; 24-frequency converter multifunctional relay output normally open contact RC; 25-frequency converter starting circuit fault indicator light; 26-system control circuit power indicator light; 27-star-delta starting running circuit; 28-frequency converter starting running circuit; 29-frequency converter fault circuit; 30-power indicator circuit; 31-star-delta starting motor system control circuit; 32-frequency converter starting motor system control circuit; 33-new star-delta motor starting system main circuit. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.

[0019] Embodiment 1

[0020] As Figures 1-2The embodiment provides a novel star-delta motor starting system, a starting control mode of which is a method combining star-delta and a frequency converter to control starting operation of the motor, wherein the equipment in the system is: one crusher, and accessories include: one motor (power: 75KW).

[0021] The electrical part of the star-delta starting system of the system includes: three sets of fuses, one total circuit breaker, one branch circuit breaker, three sets of AC contactors, one thermal relay, one starting button, one stop button, one star-delta starting system circuit operation indicator lamp, one time relay, one main motor, and a plurality of control wires.

[0022] The electrical part of the frequency converter starting system of the system includes: one branch circuit breaker, one frequency converter, one frequency conversion AC contactor, one thermal relay, one starting button, one stop button, one frequency converter starting system circuit operation indicator lamp, one frequency converter starting system circuit fault indicator lamp, one control circuit power supply indicator lamp, and a plurality of control wires.

[0023] The utility model discloses a novel star-delta and frequency converter combined motor starting control system, that is, generally under normal circumstances, the frequency converter control circuit is adopted to start the motor to run, when the frequency converter stops working after appearing the fault, can directly switch to the star-delta control circuit to start the motor to run under the condition that the frequency converter is not used to start.

[0024] As shown in Figure 1 The utility model discloses a novel star-delta and frequency converter combined motor starting control system, that is, generally under normal circumstances, the frequency converter control circuit is adopted to start the motor to run, when the frequency converter stops working after appearing the fault, can directly switch to the star-delta control circuit to start the motor to run under the condition that the frequency converter is not used to start.

[0025] The 380V three-phase power supply U, V and W phases are introduced, and a fuse FU is additionally installed to protect the circuit, the output end of the fuse FU is connected with the input end of a total circuit breaker QF I, the output end of the total circuit breaker QF I is connected with the input end of a branch circuit breaker QF II and a branch circuit breaker QF III respectively, the output end of the branch circuit breaker QF II and the branch circuit breaker QF III is connected with the input end of a main contactor KM I and the input end of a frequency converter VFD respectively, the output end of the main contactor KM I is connected with the input end of a thermal relay FR I, the output end of the frequency converter VFD is connected with the input end of a frequency conversion alternating current contactor KM IV, the output end of the frequency conversion alternating current contactor KM IV is connected with the input end of a thermal relay FR II, the output end of the thermal relay FR II and the output end of the thermal relay FR I are connected with the connection terminal of the crusher main motor M; a star contactor KM III is connected with the connection terminal U II, V II and W II of the crusher main motor M, and a delta contactor KM II is connected with the connection terminal U I, V I, W I and U II, V II, W II on the front and back sides of the crusher main motor M, that is, the motor realizes the star interconnection of the three-phase winding through the star contactor KM III, and the motor realizes the delta interconnection of the three-phase winding through the delta contactor KM II.

[0026] As shown in Figure 2 The control circuit of the utility model is composed of two parts, specifically including a star-delta starting motor system control circuit and a frequency converter starting motor system control circuit, specifically:

[0027] The first part is the star-delta starting motor system control circuit 31, specifically as follows: 220V two-phase power supply U and N phases are introduced, wherein after the U phase is introduced, a group of thermal relay FR1 normally closed contact 1 is connected in series, the output end of which is connected with a star-delta starting circuit stop button 2, the output end of the star-delta starting circuit stop button 2 is connected with a star-delta starting circuit start button 3, a group of main contactor KM I normally open contact 4 is connected in parallel on the star-delta starting circuit start button 3, and then four paths are branched from the output end of the star-delta starting circuit start button 3: the first path is connected with a frequency conversion alternating current contactor KM IV normally closed contact 5 and a main contactor KM I coil 6; the second path is connected with a delta contactor KM II normally closed contact 7, a time relay KT delay opening contact 8 and a star contactor KM III coil 9, and a group of time relay KT coil 10 is connected in parallel between the time relay KT delay opening contact 8 and the star contactor KM III coil 9; the third path is connected with a delta contactor KM II normally open contact 11, a star contactor KM III normally closed contact 12 and a delta contactor KM II coil 13, and a group of time relay KT delay closing contact 14 is connected in parallel between the two ends of the delta contactor KM II normally open contact 11; the fourth path is connected with a star-delta starting circuit running indicator light 15.

[0028] The second part circuit is a variable frequency starter motor system control circuit 32, and is specifically as follows: the circuit is continued to be led out from the live wire U phase, and is then divided into three paths: the first path is connected with a group of hot relays FR II normally closed contacts 16, the output end of the hot relays FR II normally closed contacts 16 is connected with a variable frequency starter circuit stop button 17, the output end of the variable frequency starter circuit stop button 17 is connected with a variable frequency starter circuit start button 18, a group of variable frequency alternating current contactors KM IV normally open contacts 22 are connected in parallel on the variable frequency starter circuit start button 18, then the output end of the variable frequency starter circuit start button 18 is connected with a main contactor KM I normally closed contact 19 and a variable frequency alternating current contactor KM IV coil 20, and a group of variable frequency starter circuit running indicator lamps 21 are connected in parallel between the main contactor KM I normally closed contact 19 and the variable frequency alternating current contactor KM IV coil 20. The second path is connected with a variable frequency starter circuit fault indicator lamp 25 and a variable frequency starter multifunctional relay output normally open contact 24, and a group of variable frequency relays normally open contacts 23 are connected in parallel between the variable frequency starter multifunctional relay output normally open contact 24. The third path is connected with a group of power indicator lamps 26 of the system control circuit. Finally, the four output ends of the first part circuit and the three output ends of the second part circuit are all connected with the zero line N phase, so that a closed loop is formed, and the normal operation of the novel star-delta motor starting system control circuit can be realized.

[0029] The specific embodiment of the utility model is to start the operation of the motor through the mode of combination of star-delta and variable frequency starter, and the starting mode is divided into two kinds: one is star-delta starting mode, and the other is variable frequency starter starting mode, and the operator can arbitrarily switch the above two starting modes by pressing the button. When the operator presses the star-delta starting circuit start button, the star-delta starting circuit operates, the motor is started and operated in the star-delta mode, the star-delta starting circuit stop button is pressed after the task is completed, and the motor stops operating. When the operator presses the variable frequency starter starting circuit start button, the variable frequency starter starting circuit operates, the motor is started and operated in the variable frequency starter mode, the variable frequency starter starting circuit stop button is pressed after the task is completed, and the motor stops operating. The whole starting operation process of the utility model is simple, fast, safe and efficient, and in particular in the variable frequency starter starting mode, the variable frequency starter parameters matched with the motor can be set and adjusted according to the coal powder import and export amount of the crusher, and the memory storage of the variable frequency starter is utilized to realize the rapid and efficient starting and stable operation of the motor.

[0030] The circuit of the motor starting system mainly consists of a star-delta starting motor system circuit and a frequency converter starting motor system circuit, wherein a group of contactor normally closed points are respectively connected in series in the control circuits to form interlocks, thereby realizing mutual replacement of the star-delta starting circuit and the frequency converter starting circuit. For example, if the circuit is abnormal in the star-delta starting state, the star-delta starting circuit will switch to the frequency converter starting circuit to continue running, and if the circuit is abnormal in the frequency converter starting state, the frequency converter starting circuit will switch to the star-delta starting circuit to continue running, so that the equipment can continuously run without causing stoppage. Since the frequency converter starting circuit of the system also has protection functions such as overcurrent, overvoltage, short circuit, open phase, undervoltage and locked rotor, the frequency converter and the motor and the like can be protected during equipment running, so that the frequency converter and the motor and the like will not be burnt out.

[0031] It can be known from the operation effect of the utility model that the combination of star-delta and frequency converter can completely realize the starting system transformation of the crusher of the heat supply workshop, and also solves the problems of frequent long-term manual starting, complex starting process, too long starting time, high equipment failure rate and inconvenient maintenance of maintenance personnel and the like. The utility model has simple and understandable overall structure, convenient and feasible operation, stable and safe running, saves a large number of electric components, reduces energy loss and cost, improves the working efficiency of the equipment, creates the profit and economic benefit value of the enterprise.

Claims

1. A novel star-delta motor starting system, comprising introducing 380V three-phase power supply U, V, W phase, and installing a fuse FU to protect the line, characterized in that, The output end of the fuse FU is connected with the input end of the total circuit breaker QF I, the output end of the total circuit breaker QF I is connected with the input end of the branch circuit breaker QF II and QF III respectively, the output end of the branch circuit breaker QF II and QF III is connected with the input end of the main contactor KM I and the input end of the frequency converter VFD respectively, the output end of the main contactor KM I is connected with the input end of the thermal relay FR I, the output end of the frequency converter VFD is connected with the input end of the frequency AC contactor KM IV, the output end of the frequency AC contactor KM IV is connected with the input end of the thermal relay FR II, the output end of the thermal relay FR II and the output end of the thermal relay FR I are connected with the terminal of the main motor M of the crusher; the star contactor KM III is connected with the terminal U II, V II and W II of the main motor M of the crusher, the delta contactor KM II is connected with the terminal U I, V I, W I and U II, V II, W II of the main motor M of the crusher.

2. A novel star-delta motor starting system as claimed in claim 1, wherein: The control circuit of the starting system is composed of a star-delta starting motor system control circuit (31) and a frequency converter starting motor system control circuit (32).

3. A novel star-delta motor starting system as claimed in claim 2, wherein: The star-delta starting motor system control circuit (31) comprises introducing 220V two-phase power supply U, N phase, a group of thermal relay FR I normally closed contact (1) connected in series from the live wire U phase, the output end of the thermal relay FR I normally closed contact (1) is connected with the star-delta starting circuit stop button (2), the output end of the star-delta starting circuit stop button (2) is connected with the star-delta starting circuit start button (3), a group of main contactor KM I normally open contact (4) is connected in parallel on the star-delta starting circuit start button (3), the output end of the star-delta starting circuit start button (3) is divided into 4 paths: the first path is connected with the frequency AC contactor KM IV normally closed contact (5) and the main contactor KM I coil (6); the second path is connected with the delta contactor KM II normally closed contact (7), the time relay KT delay opening contact (8) and the star contactor KM III coil (9), and a group of time relay KT coil (10) is connected in parallel between the time relay KT delay opening contact (8) and the star contactor KM III coil (9); the third path is connected with the delta contactor KM II normally open contact (11), the star contactor KM III normally closed contact (12) and the delta contactor KM II coil (13), and a group of time relay KT delay closing contact (14) is connected in parallel between the delta contactor KM II normally open contact (11); the fourth path is connected with a group of star-delta starting circuit running indicator light (15).

4. A novel star-delta motor starting system as claimed in claim 3, wherein: The frequency converter starting motor system control circuit (32) from the fire U phase continues to draw out and divides 3 ways: the first way connects a group of thermal relay FR II normally closed contact (16), the thermal relay FR II normally closed contact (16) output end connects the frequency converter starting circuit stop button (17), the frequency converter starting circuit stop button (17) output end connects the frequency converter starting circuit start button (18), a group of variable frequency AC contactor KM IV normally open contact (22) is connected in parallel on the frequency converter starting circuit start button (18), the output end of the frequency converter starting circuit start button (18) connects the main contactor KM I normally closed contact (19) and the variable frequency AC contactor KM IV coil (20), and a group of variable frequency converter starting circuit operation indicator (21) is connected in parallel across the main contactor KM I normally closed contact (19) and the variable frequency AC contactor KM IV coil (20); the second way connects the frequency converter starting circuit fault indicator (25) and the frequency converter multifunctional relay output normally open contact (24), and a group of variable frequency relay normally open contact (23) is connected in parallel across the frequency converter multifunctional relay output normally open contact (24); the third way connects a group of system control circuit power indicator (26).

5. A novel star-delta motor starting system as claimed in claim 4, wherein: The four-way output of the star-delta starting motor system control circuit (31) and the three-way output of the frequency converter starting motor system control circuit (32) are all connected to the zero line N phase, forming a closed loop.

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