Electromagnetic voltage regulation type high-voltage motor soft start device

Abstract

The utility model relates to an electromagnetic voltage regulation type high-voltage motor soft starting device which comprises a main body iron core structure, the main body iron core structure is divided into an upper part and a lower part, a plurality of iron core stand columns are arranged on the lower part of the main body iron core structure, and the plurality of iron core stand columns are fixed on a main body support through iron core fixing screws; the main body support comprises an upper main body support and a lower main body support, an iron core air gap adjusting screw rod is further arranged between the upper main body support and the lower main body support, and an iron core air gap adjusting screw rod locking nut is arranged on the iron core air gap adjusting screw rod; the plurality of iron core columns are all provided with working windings, and the working windings are provided with electrical output terminals and electrical input adjustable terminals.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of motor voltage reducing starter, and particularly relates to an electromagnetic voltage regulating type high-voltage motor soft starter. BACKGROUND

[0002] The starting of a motor causes great damage to the power grid and the motor itself. If the motor is directly started, the large starting current will have an impact on the power grid similar to that of a three-phase short circuit, which often causes power oscillation and makes the power grid unstable. The starting current contains a large amount of high-order harmonics, which will cause high-frequency resonance with the power grid circuit parameters, resulting in faults such as misoperation of the relay protection and failure of the automatic control. The joule heat generated by the large current repeatedly acts on the outer insulation of the wire, which accelerates the aging of the insulation and reduces the service life. The mechanical force generated by the large current causes the wires to rub against each other, which reduces the service life of the insulation. The vibration of the contacts during the closing of the high-voltage switch will generate an operating overvoltage on the stator winding of the motor. The large current generates a great impact force on the stator coil and the rotor squirrel cage, which can cause faults such as loosening of the clamping, deformation of the coil, and breakage of the squirrel cage.

[0003] The traditional reactor voltage reducing starter cannot meet the requirement of adjusting the size of the starting current. The thyristor type starter has high requirements for voltage balance, generates a large amount of harmonics, pollutes the power grid, has complex control, and has a high failure rate. Therefore, it is necessary to study a relatively stable and harmonic elimination type. SUMMARY

[0004] In order to solve the problems that the existing reactor voltage reducing starter cannot meet the requirement of adjusting the size of the starting current, and the existing thyristor type starter cannot meet the requirement of voltage balance, generates a large amount of harmonics, pollutes the power grid, has complex control, and has a high failure rate.

[0005] The application provides an electromagnetic voltage regulating type high-voltage motor soft starter, which comprises a main body iron core composed of an upper iron core part and a lower iron core part, a plurality of iron core columns are arranged between the upper iron core part and the lower iron core part, and the plurality of iron core columns are fixed to the lower iron core part through iron core fixing screws; the upper iron core part comprises an upper iron core support and an upper cross bar, the lower iron core part comprises a lower iron core support and a lower cross bar, an iron core air gap adjusting screw is further arranged between the upper iron core support and the lower iron core support, and an iron core air gap adjusting screw locking nut is arranged on the iron core air gap adjusting screw; working windings are arranged on the plurality of iron core columns, and electrical output connection terminals and electrical input adjustable connection terminals are arranged on the working windings.

[0006] Further, the working winding comprises high-voltage windings and an electrical control winding, and the electrical control winding is arranged between the two high-voltage windings.

[0007] Further, a magnetic isolation material is arranged between the upper core part and the core column.

[0008] Further, the core column is made of 0.3 or 0.27 mm oriented silicon steel sheets.

[0009] The electromagnetic voltage-regulating high-voltage motor soft starting device provided by the application uses multiple adjustment modes, expands the adjustment range and controllable range, and has diversified adjustment modes and simple structure.

[0010] The application will be further described in detail below in combination with embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is an electrical principle schematic diagram of the electromagnetic voltage-regulating high-voltage motor soft starting device.

[0012] Figure 2 It is a first side schematic diagram of the electromagnetic voltage-regulating high-voltage motor soft starting device.

[0013] Figure 3 It is a core composition side schematic diagram of the electromagnetic voltage-regulating high-voltage motor soft starting device.

[0014] Figure 4 It is a second side schematic diagram of the electromagnetic voltage-regulating high-voltage motor soft starting device.

[0015] Figure 5 It is a top view schematic diagram of the electromagnetic voltage-regulating high-voltage motor soft starting device.

[0016] In the figure, 1 is an upper core part, 1-1 is an upper core support, 1-2 is an upper cross, 2 is a core column, 2-3 is a magnetic isolation material, 3 is a working winding, 3-1 is a high-voltage winding, 4 is an electrical output terminal, 5 is an electrical input adjustable terminal, 6 is a lower core part, 6-1 is a lower core support, 6-2 is a lower cross, 7 is a core fixing screw, 8 is a core air gap adjusting screw, 9 is a core air gap adjusting screw locking nut, and 10 is an electrical control winding. DETAILED DESCRIPTION

[0017] In order to further explain the technical means and effects adopted by the application to achieve the predetermined purposes, the specific implementation mode, structural features and effects of the application will be described in detail below in combination with the drawings and embodiments.

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0019] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "aligned", "overlapped", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0020] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features; in the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0021] Embodiment 1

[0022] The present embodiment provides an electromagnetic voltage regulating type high-voltage motor soft start device as shown in the figure, Figures 1-5 Figure 1 In the device, two or more taps are provided at the tap adjustment, which can adapt to different voltage levels and have the adjustment effect of line resistance at the same time to meet the requirements of different working conditions. The adjustment is fixed adjustment, and the device needs to be adjusted and installed in place in advance before working. In this way, the purpose of changing the starting voltage of the load motor can be achieved. Figures 2-5 The air gap of the iron core is fixed adjustment to meet the requirements of different working conditions, and the device needs to be adjusted and installed in place in advance before working.

[0023] ​Further, the electromagnetic voltage-regulating high-voltage motor soft-start device comprises a main body core composed of an upper core part 1 and a lower core part 6, a plurality of core columns 2 are arranged between the upper core part 1 and the lower core part 6, and the plurality of core columns 2 are fixed between the upper core part 1 and the lower core part 6 through core fixing screws 7; the upper core part 1 comprises an upper core support 1-1 and an upper cross 1-2, the lower core part 6 comprises a lower core support 6-1 and a lower cross 6-2, a core air gap adjusting screw 8 is further arranged between the upper core support 1-1 and the lower core support 6-1, and a core air gap adjusting screw locking nut 9 is arranged on the core air gap adjusting screw 8; working windings 3 are arranged on the plurality of core columns 2, and electrical output connection terminals 4 and electrical input adjustable connection terminals 5 are arranged on the working windings 3.

[0024] Further, the working windings 3 comprise high-voltage windings 3-1 and electrical control windings 10, and the electrical control windings 10 are arranged between the two high-voltage windings 3-1.

[0025] Further, the working windings 3 are of the same process as the high-voltage windings of the dry-type transformer and adopt epoxy resin vacuum casting coils. F-grade epoxy casting system is used for casting in a vacuum state. The working windings 3 have good insulation performance and high mechanical strength and can withstand current impact and cooling impact without cracking; the epoxy casting coils do not absorb water, have good moisture resistance, have low partial discharge, and can safely operate in harsh environmental conditions.

[0026] Further, the core columns 2 are further provided with electrical control windings 10. The electrical control windings 10 are direct current coils for adjusting current to change the magnetic flux of the core columns 2, so as to change the current in the high-voltage windings 3-1 of the working windings 3, so as to achieve the purpose of changing the starting current of the load motor.

[0027] Further, a magnetic isolation material 2-3 is arranged between the upper core part 1 and the core columns 2; preferably, the magnetic isolation material 2-3 is a magnetic isolation plate, and an aluminum magnetic isolation plate is preferably selected.

[0028] Further, the core columns 2 are made of 0.3 or 0.27 mm oriented silicon steel sheets.

[0029] The iron core column 2 is sprayed with rust-proof paint, and gap isolation material 2-3 is laid between the upper and lower iron cores to reduce magnetic noise; the overall structure can effectively reduce vibration and noise, and the structure includes: strong compression of the assembly, the gap between the iron core column 2 and the high-voltage winding 3-1 of the working winding 3 is filled with insulating silicone, which reduces the resonance noise generated during starting, and an elastic rubber pad is provided between the overall assembly and the cabinet mounting base, which is installed on the cabinet to reduce resonance noise. The linear degree is good, the mechanical strength is high, the installation is simple, etc.; it will not be disturbed by the external environment, and will not pollute the external environment, the vibration is small, the noise is low, the magnetic flux leakage is small, and the electromagnetic interference to the environment is small; the overall structure of the product is compact, the installation size is small, and the space occupied is small.

[0030] The iron core column 2 is made of high-quality low-loss cold-rolled oriented silicon steel, which is resistant to saturation and has stable inductance value. It adopts a non-punching design to reduce loss and reduce eddy current heating during operation. It requires special process treatment, has good moisture resistance, and can operate normally in harsh environments with a temperature of -20 to 65 degrees and a humidity of 0 to 90%. After the iron core is stacked, degassing and moisture removal are performed at high temperature. The iron core column 2 is wrapped without fear, and the surface of the iron core is treated to prevent moisture and rust to ensure good no-load performance. The upper cross bar 1-2 and the lower cross bar 6-2 are tightened by the support and the iron core fixing screw 7, and the cross-sectional surface is smooth and treated with anti-rust. In the design, it is required to avoid the resonance phenomenon caused by the inherent frequency of the iron core and the frequency of the magnetic hysteresis vibration. The burr of the processed iron core sheet is not greater than 0.025mm. The oriented iron core column generates greater inductance in the alternating current coil, and the magnetic flux regulation of the iron core is adjusted by the computer according to the starting setting requirements by adjusting the current of the electrical control winding 10 to change the reactance value of the reactor. The purpose of smooth starting is achieved.

[0031] The multiple iron core columns 2 provided between the upper iron core part 1 and the lower iron core part 6 are used in combination, the winding is wrapped around the lower part of the column, and the winding has at least three groups of connection ends to facilitate performance adjustment. The iron core column 2 provided between the upper cross bar 1-2 and the lower cross bar 6-2 is adjusted by the iron core air gap adjustment screw 8 through the upper iron core support 1-1 and the lower iron core support 6-1, and the starting performance is adjusted by the size of the air gap. An electrical control winding 10 is provided inside the iron core assembly, and the starting performance is adjusted by the excitation regulation of the current size. The above-mentioned multiple ways are used to change the voltage and current during motor starting to achieve the purpose of smooth starting of the motor. The device needs to be used in combination with matching switch equipment and control system.

[0032] High-voltage winding adopts insulation material of F-grade as main material for processing, copper material is T2 copper epoxy glass silk wrapped flat copper wire winding, adopts multiple process winding, and good insulation of head, finished product has the advantages of high electrical insulation and mechanical strength, low temperature rise, small heat; adopt epoxy resin vacuum casting, effectively prevent the charged part from direct contact with the outside world.

[0033] Low-voltage winding adopts wrapping and dipping paint treatment, brushing insulating paint, working winding and core column are sleeved, and are fixed by internal pad, upper and lower core clamps are fixed by screw rod, forming a whole, reducing vibration and noise.

[0034] When the starting device is used, the hazards existing in the direct starting of the conventional motor almost disappear; the motor has high cost value and plays a core role in industrial, agricultural and other life production. Its failure often causes great economic loss, so it is necessary to use perfect protection. The starting device uses epoxy resin vacuum casting, which has great environmental adaptability in places with large changes in external environment, can be used in various complex environments, and is completely not disturbed by the external environment. At the same time, the stacking and isolation of the core effectively reduce the noise generated by equipment vibration. The device can be linked with switch cabinet and other electrical equipment, and cooperate with the latest digital control system, which has comprehensive protection function, long service life, low price, reduces investment, and has wide market prospect.

[0035] The device has the advantages of traditional motor starter, which is diversified in adjustment mode, controllable range, simple operation, small maintenance amount, and can be started smoothly and steplessly for many times in a short time without damage to the motor. Its structure is relatively simple, which ensures the normal production of customers, reduces the maintenance frequency, and improves economic benefits.

[0036] Characteristics:

[0037] 1. The device is provided with two or more taps at the tap adjustment position, which can adapt to different voltage grades and has the function of adjusting line resistance at the same time to meet the requirements of different working conditions. The adjustment is fixed adjustment, and the device needs to be adjusted and installed in place in advance before work.

[0038] 2. The air gap of the core is fixed adjustment, which controls the size of the air gap by adjusting the core clamp to adjust the size of the inductance. The adjustment of inductance size is to have better starting performance to meet the needs of different working conditions. The device needs to be adjusted and installed in place in advance before work.

[0039] 3. Self-coupling magnetic regulation: self-coupling magnetic regulation is real-time regulation during starting process, real-time data is monitored by control computer during starting process, and automatic regulation is performed by comparing with basic data, and electrical parameters required by starting are satisfied, and self-coupling magnetic size is changed by controlling SCR conduction foot to satisfy starting performance requirement. Self-coupling magnetic coil is main execution unit, and is installed in iron core window.

[0040] During motor starting, voltage and current signals required by self-regulation are realized by voltage reduction and constant current starting according to actual working condition pre-setting range, load change during starting process and sensor feedback. When current and voltage reach setting value, full voltage signal is sent by control system, thus, smooth and stepless starting motor is ensured, impact of large torque and high voltage, large current on upper switch during starting is avoided, service life of motor is greatly improved, production of user is ensured, and economic loss of user caused by equipment failure due to large current and high voltage is reduced.

[0041] The above is further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled person in the art to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, and all of them shall be regarded as falling within the protection scope of the present application.

Claims

1. An electromagnetic voltage-regulated high-voltage motor soft-starter device, characterized by: The application relates to a main body iron core composed of an upper iron core part (1) and a lower iron core part (6), a plurality of iron core columns (2) are arranged between the upper iron core part (1) and the lower iron core part (6), the plurality of iron core columns (2) are fixed on the lower iron core part (6) through iron core fixing screws (7), the upper iron core part (1) comprises an upper iron core support (1-1) and an upper cross (1-2), the lower iron core part (6) comprises a lower iron core support (6-1) and a lower cross (6-2), an iron core air gap adjusting screw (8) is further arranged between the upper iron core support (1-1) and the lower iron core support (6-1), an iron core air gap adjusting screw locking nut (9) is arranged on the iron core air gap adjusting screw (8), working windings (3) are arranged on the plurality of iron core columns (2), and electrical output connecting terminals (4) and electrical input adjustable connecting terminals (5) are arranged on the working windings (3).

2. The electromagnetic voltage-regulated high-voltage motor soft-starter device of claim 1, wherein: The working windings (3) comprise high-voltage windings (3-1) and electrical control windings (10), and the electrical control windings (10) are arranged between the two high-voltage windings (3-1).

3. The electromagnetic voltage-regulated high-voltage motor soft-starter device of claim 1, wherein: A magnetic isolation material (2-3) is arranged between the upper iron core part (1) and the iron core column (2).

4. An electromagnetic voltage regulating type high voltage motor soft starter according to claim 1, characterized in that: The iron core column (2) is made of 0.3 or 0.27 mm oriented silicon steel sheets.

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