CN201226502Y - Soft actuating apparatus for traveling motor - Google Patents
Soft actuating apparatus for traveling motor Download PDFInfo
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- CN201226502Y CN201226502Y CNU2008200673406U CN200820067340U CN201226502Y CN 201226502 Y CN201226502 Y CN 201226502Y CN U2008200673406 U CNU2008200673406 U CN U2008200673406U CN 200820067340 U CN200820067340 U CN 200820067340U CN 201226502 Y CN201226502 Y CN 201226502Y
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Abstract
The utility model relates to a soft starter for a marching-type electric motor, which comprises a reactor, a magnetic core tractor and an automatic control box. The automatic control box consists of a CPU unit, an input port unit, an output port unit and a variable frequency output unit. The reactor consists of three groups of coils and a magnetic core; the magnetic core is divided into a magnetic core capable of axially moving and a fixed magnetic core; each phase voltage is taken as a group of coils, and the three groups of coils are respectively wound on the magnetic core capable of axially moving. The output port unit of the automatic control box is connected with each group of coils, the electric motor and the input port unit, which are connected in parallel with a bypass main switch, to form a return circuit. The variable frequency output unit of the automatic control box is connected with the magnetic core tractor which is connected with the magnetic core capable of axially moving the reactor. The utility model realizes the soft starting of the electric motor, is a novel starting way with simple circuit, clear principle, convenient operation, little maintenance, investment saving and fast effect, and has broad development prospect.
Description
Technical field
The utility model is applied in the soft start field of high-low pressure asynchronous motor, synchronous motor, is specifically related to a kind of travelling motor soft starter.
Background technology
At present, the startup of all kinds of motor is categorized as full voltage starting and reduced-voltage starting, adopts total head to open basically for the motor of small-power low pressure.So-called full voltage starting is to task voltage starting according to the rated operational voltage value of motor, but such Starting mode generally is applicable to the low power motor of low pressure, the motor of or high-power high-power for those, if very big shortcoming is arranged when adopting full voltage starting: the one, bigger power source need be provided, increased start-up cost, impulse ratio to electrical network is bigger simultaneously, has influence on the other normal operation that is equipped with that installs.The 2nd, bigger to the power supply unit impact, cause the damage of power supply unit easily.The 3rd, to the impact of motor itself, thereby shorten motor useful life or the like.The motor start-up of many high-powers all adopts and reduces the Starting mode of tasking voltage and limiting starting current, promptly so-called soft starting mode thus.The most frequently used soft starting mode has following several at present.
1, voltage starting is tasked in reduction.For example adopt the conversion of physics step-down or Y-△, artificially reduce starting resistor, when running speed is thrown total head again behind certain value.
2, solid-state resistance current-limited startup.
3, liquid resistance current-limited startup, i.e. water resistance method.
4, reactor restriction current start, this type of mode has many branches.
5, controllable silicon tandem promoter.
6, variable frequency starting.
Above Starting mode all finds application in the work of reality, but all has some unsurmountable defectives.For example: cost an arm and a leg, one-time investment is big, the maintenance cost height, and harmonic pollution is serious, and as variable frequency starting, complex structure, energy-saving effect are not remarkable, and spoilage is more high.
In the above soft starting mode of introducing, be most widely used in the reactance mode again, because its branch is maximum.As: switch transformer, saturable reactor, autotransformer etc.We are example with the most frequently used switch transformer, as accompanying drawing 1.
The principle of this mode is by the control to the bidirectional triode thyristor of transformer secondary, and changes the load of transformer secondary, thereby changes the reactance on the former limit of transformer, when reaching motor start-up to the restriction of its starting current.This pattern is maximum in the market.But the shortcoming that this mode is fatal: the life-span is not high, especially the controllable silicon of the secondary of transformer, because its control and overvoltage reason are very easily damaged, so just increased the maintenance cost of equipment, the control section of this equipment is with high content of technology simultaneously, safeguard and the debugging complexity that workload is also big, these all limit the use of producer.
Summary of the invention
The utility model is in order to overcome the problem that existing above-mentioned technology exists, and provide a kind of travelling motor soft starter, the method of the reactance amount by changing inductance, make a whole set of soft start operation of equipment convenient, safeguard simple, stable, with low cost, be about 1/3 of like product, prove that through a large amount of simulation and field experiment this device is truly feasible.
The technical solution of the utility model is:
The travelling motor soft starter, by reactor, three parts of magnetic core hauling machine and automatic control box are formed, automatic control box is by CPU element, the unit, input port, the delivery outlet unit, the frequency conversion output unit is formed, reactor is to be made of three groups of coils and magnetic core, and magnetic core is divided into can move axially magnetic core and fixed magnetic core two parts, every phase voltage is one group of coil, three groups of coils are wrapped in respectively and can move axially on the magnetic core, the delivery outlet unit of automatic control box and every group of coil of a bypass main switch in parallel, motor and unit, input port connect into the loop, the frequency conversion output unit of automatic control box links to each other with the magnetic core hauling machine, and the magnetic core hauling machine links to each other with the moved axially magnetic core of reactor.
1. the magnetic gap of reactor is to change, and coil can design according to the motor of different capabilities;
2. magnetic core hauling machine:, finish moving axially the magnetic core action of advancing as motive power by a small-sized motor, change the magnetic gap of reactor by mechanical reduction case and curve wheel;
3. automatic control box: form by CPU element, unit, input port, delivery outlet unit, frequency conversion output unit, effect is a real-time rotating speed of being gathered motor by the unit, input port, judge by CPU, provide the combined floodgate and the trip signal of bypass main switch by the delivery outlet unit, the frequency conversion output unit can move axially the magnetic core travel rate as changing, the rotating speed of control traction electric machine.
The motor soft start that the utility model is realized, circuit is simple, and principle is clear, and is easy to operate, and maintenance is little, reduced investment, instant effect is a kind of novel Starting mode in the motor soft start, has wide development prospect.
Description of drawings
Fig. 1 is switch transformer commonly used structural representation to the motor soft start.
Fig. 2 is the structural representation to the motor soft start of the present utility model.
Embodiment
The utility model will be further described in conjunction with the accompanying drawings.
As shown in Figure 2, the utility model is by reactor, three parts of magnetic core hauling machine 1 and automatic control box are formed, automatic control box is by CPU element, the unit, input port, the delivery outlet unit, the frequency conversion output unit is formed, reactor is to be made of three groups of coils 3 and magnetic core, and magnetic core is divided into can move axially magnetic core 2 and fixed magnetic core two parts, every phase voltage is one group of coil, three groups of coils 3 are wrapped in respectively and can move axially on the magnetic core 2, the delivery outlet unit of automatic control box and every group of coil of a bypass main switch in parallel, motor 5 and unit, input port connect into the loop, the frequency conversion output unit of automatic control box links to each other with magnetic core hauling machine 1, and magnetic core hauling machine 1 links to each other with the moved axially magnetic core 2 of reactor.
1. the magnetic gap of reactor is to change, and coil can design according to the motor of different capabilities;
2. magnetic core hauling machine:, finish moving axially magnetic core 2 action of advancing as motive power by a small-sized motor, change the magnetic gap 4 of reactor by mechanical reduction case and curve wheel;
3. automatic control box: form by CPU element, unit, input port, delivery outlet unit, frequency conversion output unit, effect is a real-time rotating speed of being gathered motor by the unit, input port, judge by CPU, provide the combined floodgate and the trip signal of bypass main switch by the delivery outlet unit, the frequency conversion output unit can move axially the magnetic core travel rate as changing, the rotating speed of control traction electric machine.
As shown in Figure 2, magnetic core is produced displacement at inductance coil, thereby change the inductance value of coil by machine power.Following formula be inductance value and reactance relational expression Z=WL=2 π fL............ 1.
In the formula: Z is the reactance of coil, and W is an angular frequency, and f is the line frequency, and L is the inductance value of coil.
See that from top formula when frequency when being constant, the reactance of inductance is directly proportional with inductance value.
And the inductance in the coil
In the formula: 1 is the length of coil, and N is the number of turn of coil, and S is the sectional area of coil, u
0Be permeability of vacuum, u
sBe the relative permeability of coil inner magnetic core, R is the fourdrinier wire coefficient.H is the Henry henry.
2. formula is the inductance value of single layer coil, but also can do approximate calculation to multilayer inductor.
From formula as can be known, u
sBe the relative permeability of coil inner magnetic core, the magnetic gap of this coefficient and magnetic core is approximated to the relation of inverse ratio, that is to say, when the magnetic circuit gap of magnetic core changes, for example becomes big, and the magnetic core permeability will diminish.According to following formula, u
0Be 1, when all the other parameters were certain value, magnetic gap was big more, and the inductance value L of coil just diminishes, thereby induction reactance diminishes, and its damping to electric current diminishes, and according to this rule, we design the travelling motor soft starter.According to diagram, before the motor start-up this coil is sealed in the loop, and make the magnetic gap of the magnetic core of coil be in minimum position.The startup power supply that closes, because the damping action of reactance, the inrush current limitation that makes motor is in the setting scope, motor is non-impacting start under low current, by the dragging of control motor, makes the magnetic gap of the magnetic core of coil increase in time and increase then.From the above mentioned, the reactance of coil increases in time and diminishes, and the electric current by motor progressively increases, and rotating speed of motor also increases thereupon.After motor speed reaches rated speed, by the bypass main switch with the full voltage input, the motor normal operation input, thereupon, soft starting device withdraws from the loop automatically, thereby finishes whole operating process of soft starter for motor.By reverse mode, can realize the operation of the soft stop of motor simultaneously.
Claims (1)
1, the travelling motor soft starter, by reactor, three parts of magnetic core hauling machine and automatic control box are formed, automatic control box is by CPU element, the unit, input port, the delivery outlet unit, the frequency conversion output unit is formed, it is characterized in that: reactor is to be made of three groups of coils and magnetic core, and magnetic core is divided into can move axially magnetic core and fixed magnetic core two parts, every phase voltage is one group of coil, three groups of coils are wrapped in respectively and can move axially on the magnetic core, the delivery outlet unit of automatic control box and every group of coil of a bypass main switch in parallel, motor and unit, input port connect into the loop, the frequency conversion output unit of automatic control box links to each other with the magnetic core hauling machine, and the magnetic core hauling machine links to each other with the moved axially magnetic core of reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200673406U CN201226502Y (en) | 2008-05-22 | 2008-05-22 | Soft actuating apparatus for traveling motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200673406U CN201226502Y (en) | 2008-05-22 | 2008-05-22 | Soft actuating apparatus for traveling motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201226502Y true CN201226502Y (en) | 2009-04-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200673406U Expired - Fee Related CN201226502Y (en) | 2008-05-22 | 2008-05-22 | Soft actuating apparatus for traveling motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201226502Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI774069B (en) * | 2020-09-22 | 2022-08-11 | 新代科技股份有限公司 | Actuating apparatus and driving method thereof |
-
2008
- 2008-05-22 CN CNU2008200673406U patent/CN201226502Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI774069B (en) * | 2020-09-22 | 2022-08-11 | 新代科技股份有限公司 | Actuating apparatus and driving method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090422 Termination date: 20110522 |