CN203278710U - A New Electromechanical Microcomputer Magnetic Control Device - Google Patents

Abstract

The utility model provides a novel magnetic control device of a motor-type microcomputer. The device comprises an auto transformer system and an intelligent microcomputer controller. The voltage input end of the auto transformer system is connected with a voltage output end of a power supply, and the voltage output end of the auto transformer system is connected with a voltage input end of an electrical device. Connected with the auto transformer system, the intelligent microcomputer controller is used for regulating and controlling the output voltage of the auto transformer system. By using the intelligent microcomputer controller, the device can automatically regulate a running voltage according to an actual load of the motor and reduce a starting current, iron loss and copper loss, so that electric energy is saved, service lifetime of the motor is extended, and a large-power break-out torque is prevented from damaging transmission machinery.

Description

A New Electromechanical Microcomputer Magnetic Control Device

technical field

The utility model relates to the technical field of electromagnetic control, in particular to a novel motor-type microcomputer magnetic control device.

Background technique

Asynchronous motors are important electrical equipment in industrial and agricultural production, which consume more than 60% of the total electricity in the grid. Therefore, the energy saving problem in the operation of asynchronous motors has attracted widespread attention. According to the relevant provisions of national standards, the operating states of a large number of asynchronous motors used by enterprises in working conditions can be divided into economic operating states, allowable operating states and non-economic operating states. In practical applications, the selection of motors is generally based on the condition that they can work normally under the maximum load, so the capacity of the motors is too large, resulting in many motors and their drive systems being in an uneconomical operating state, wasting a lot of power. . In addition, since the starting current of the motor is 4 to 7 times the rated current, direct starting of multiple high-power motors will cause a large voltage drop on the bus, which greatly affects the safe operation of other electrical equipment.

During the power transmission process, in order to reduce the voltage loss and the low voltage caused by the peak power consumption, the power supply department generally adopts the method of increasing the voltage for transmission, so that the actual voltage borne by the power load is higher than its rated voltage. For motors, too high a power supply voltage will not only increase the iron loss and copper loss of the motor, waste a lot of electric energy, but also shorten the service life of the motor due to the increase in temperature rise.

In order to solve the above-mentioned problems, the current common practice is to select a motor whose power is as close as possible to the actual load power when selecting a motor. However, the power of the motor is generally fixed, and it is difficult to achieve an optimal match. Often, the power of the motor is greater than the actual required power. In order to limit the impact of high-power motor direct start on the system, soft start is often used to start the motor. After the motor is started, the soft start device stops running, and the motor is directly powered by the bus to continue running. Therefore, after the motor is running normally , soft start can not make the motor achieve the purpose of energy saving.

Utility model content

The technical problem to be solved by the utility model is to provide a new motor-type microcomputer magnetic control device, which can automatically adjust the operating voltage according to the actual load of the motor and reduce the starting current of the motor.

The technical scheme of the utility model is:

A new motor-type microcomputer magnetic control device, including an autotransformer system and an intelligent microcomputer controller. The voltage input terminals are connected, and the intelligent microcomputer controller is connected with the autotransformer system for adjusting and controlling the output voltage of the autotransformer system.

In the novel motor-type microcomputer magnetic control device, the intelligent microcomputer controller includes a sampling circuit and a contactor control circuit, the sampling circuit is used to collect power supply voltage, motor load current and reactive power, the contactor The switch control circuit is used to control the on and off of the contactor. the

In the novel motor-type microcomputer magnetic control device, a first circuit breaker for controlling bypass output is provided between the voltage output end of the power supply and the voltage output end of the autotransformer system, and the voltage input end of the autotransformer system is connected to the output end of the autotransformer system. A second circuit breaker for controlling the voltage output of the power supply is provided between the voltage output terminals of the power supply, and a second circuit breaker for controlling the voltage output of the autotransformer system is provided between the voltage output terminals of the autotransformer system and the voltage input terminals of the electrical equipment. Three circuit breakers.

In the novel motor-type microcomputer magnetic control device, the autotransformer system includes a three-phase autotransformer and a voltage zeroing control unit composed of a plurality of AC contactors. The taps of the phase autotransformer are connected, the outlet ends are connected in parallel and then grounded, and the control end is connected with the contactor control circuit of the intelligent microcomputer controller.

In the new motor-type microcomputer magnetic control device, the main windings of the three-phase autotransformer are cross-wound on the magnetic columns of the iron core, and the iron core is an amorphous alloy iron core.

In the novel motor-type microcomputer magnetic control device, the sampling circuit of the intelligent microcomputer controller collects the load current of the motor through a current transformer.

The new motor-type microcomputer magnetic control device also includes a reactive power compensation system, the reactive power compensation system includes a reactive power compensation capacitor and a reactive power compensation control unit composed of a plurality of AC contactors, the AC The incoming line end of the contactor is connected with the output end of the power supply line, the outgoing line end is connected with the reactive power compensation capacitor, and the control end is connected with the contactor control circuit of the intelligent microcomputer controller.

In the novel motor-type microcomputer magnetic control device, the circuit breaker is a molded case circuit breaker.

The utility model can automatically adjust its operating voltage according to the actual load of the motor through the intelligent microcomputer controller, reduce its starting current, iron loss and copper loss, not only saves electric energy, prolongs the service life of the motor, but also avoids high-power start-up Damage caused by torque to transmission machinery and equipment. Preferably, the voltage is adjusted by zero-adjustment control, and there is no voltage flicker in the process of voltage adjustment, so that the voltage can be continuously adjusted; the intelligent microcomputer controller collects the power supply voltage, motor load current and reactive power, and adjusts the voltage according to the needs. Automatically adjust the operating voltage of the motor, switch capacitors, and improve the power factor of the motor.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

As shown in Figure 1, a new motor-type microcomputer magnetic control device includes a first molded case circuit breaker 41, a second molded case circuit breaker 42, a third molded case circuit breaker 43, and six AC contactors 51, 52 , 53, 54, 55, 56, three current transformers TA1, TA2, TA3, two reactive compensation capacitors C1, C2, three-phase autotransformer 11, intelligent microcomputer controller 2; three-phase autotransformer 11 and The voltage zeroing control unit composed of AC contactors 51, 52, 53, 54 constitutes an autotransformer system 1, and two reactive power compensation capacitors C1, C2 are composed of a reactive power compensation control unit composed of AC contactors 55, 56 Reactive power compensation system 3, intelligent microcomputer controller 2 includes a sampling circuit and a contactor control circuit, the sampling circuit is used to collect the power supply voltage, motor load current and reactive power, and the contactor control circuit is used to control the on-off of the contactor , the sampling circuit collects the load current of the motor through the current transformers TA1, TA2, and TA3.

The incoming wire ends of the AC contactors 51, 52, 53, 54 are respectively connected one-to-one with the multiple groups of taps of the three-phase autotransformer 11, the outgoing wire ends are connected in parallel and grounded, and the control end is connected with the contactor control circuit of the intelligent microcomputer controller 2 Connection; the incoming line ends of the AC contactors 55 and 56 are connected to the output ends of the power supply lines, the outgoing lines are connected to the reactive power compensation capacitors C1 and C2, and the control ends are connected to the contactor control circuit of the intelligent microcomputer controller 2 .

The incoming line end of the first molded case circuit breaker 41 is connected in parallel with the incoming line end of 42 and then connected to the output end of the power supply voltage, and the outgoing line end of the second molded case circuit breaker 42 is connected to the voltage input end of the three-phase autotransformer 11. The voltage output end of the phase autotransformer 11 is connected to the incoming line end of the third molded case circuit breaker 43, and the outgoing line end of the third molded case circuit breaker 43 is connected in parallel with the outgoing line end of the first molded case circuit breaker 41 and passes through the AC contactor 55 and 56 are connected to C1 and C2, and connected to electrical equipment through current transformers TA1, TA2 and TA3; among them, the first molded case circuit breaker 41 is a manual bypass switch, and when the voltage regulation circuit fails to operate, the second A molded case circuit breaker 41 is switched on, which does not affect the continued use of the following loads.

Working principle of the utility model:

The intelligent microcomputer controller 2 calculates the output voltage required by the electrical equipment by analyzing, judging, and comparing the collected power output voltage and the current transformer signal, and controls the on-off of the AC contactors 51, 52, 53, and 54 , change the output voltage of the three-phase autotransformer 11 to ensure that the needs of electrical equipment are met, and at the same time, according to the situation of reactive power, control the on-off of the AC contactor 55, 56, switch capacitors C1, C2, and improve the electrical equipment. power factor.

The above-mentioned embodiment is only a description of the preferred embodiment of the present utility model, and is not intended to limit the scope of the present utility model. All variations and improvements should fall within the protection scope determined by the claims of the present utility model.

Claims (8)

1. Novel electric type microcomputer magnetic control means, it is characterized in that: comprise autotransformer system and Intellectual computer controller, the voltage input end of autotransformer system is connected with the power supply voltage output end, the voltage output end of autotransformer system is connected with the power consumption equipment voltage input end, described Intellectual computer controller is connected with the autotransformer system, is used for regulating the output voltage of controlling the autotransformer system.

2. Novel electric type microcomputer magnetic control means according to claim 1, it is characterized in that: described Intellectual computer controller comprises sample circuit and contactor control circuit, described sample circuit is used for gathering power supply voltage, motor load electric current and reactive power situation, and described contactor control circuit is used for the break-make of control contactor.

3. Novel electric type microcomputer magnetic control means according to claim 1 is characterized in that:

Be provided with between the voltage output end of power supply voltage output end and autotransformer system for the first circuit breaker of controlling bypass output, be provided with between the voltage input end of autotransformer system and power supply voltage output end for the second circuit breaker of controlling the power supply Voltage-output, be provided with the 3rd circuit breaker of exporting for controlling the autotransformer system voltage between the voltage output end of autotransformer system and power consumption equipment voltage input end.

4. Novel electric type microcomputer magnetic control means according to claim 2 is characterized in that:

Described autotransformer system comprises 3-phase autotransformer and the voltage zeroing control unit that is made of a plurality of A.C. contactors, the end of incoming cables of described A.C. contactor is connected with the tap of 3-phase autotransformer, ground connection after the leading-out terminal parallel connection, control end is connected with the contactor control circuit of Intellectual computer controller.

5. Novel electric type microcomputer magnetic control means according to claim 4 is characterized in that:

The main winding intersection of 3-phase autotransformer is wound on iron core magnetic post, and described iron core is selected amorphous alloy iron core.

6. Novel electric type microcomputer magnetic control means according to claim 2, it is characterized in that: the sample circuit of described Intellectual computer controller gathers the motor load electric current by current transformer.

7. Novel electric type microcomputer magnetic control means according to claim 2, it is characterized in that: this device also comprises reactive compensation system, described reactive compensation system comprises reactive compensation capacitor and the control of reactive power compensating unit that is made of a plurality of A.C. contactors, the end of incoming cables of described A.C. contactor is connected with the supply line output, leading-out terminal is connected with reactive compensation capacitor, and control end is connected with the contactor control circuit of Intellectual computer controller.

8. Novel electric type microcomputer magnetic control means according to claim 3, it is characterized in that: described circuit breaker is breaker of plastic casing.

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