CN2501238Y - Three-phase asynchronous motor with capacitors - Google Patents

Abstract

The utility model relates to a three-phase asynchronous motor with capacitors, which is formed by connecting three double polar plates capacitors or multi polar plates capacitors in parallel on an existing three-phase asynchronous motor as the capacitive compensation on the spot for the motor (inductive load), thus to realize the reactive power compensation on the spot which is difficult to realize, improve the power factors of the motor, reduce the reactive current of the power transmission line, reduce the loss and improve the power supply quality of the power network, and raise the voltage of the load terminal, the rotating speed and the output speed of the motor, therefore, the reactive power compensators and afterwards compensation facilities of the compensation control device can be reduced and the electricity economy can be improved.

Description

The capacitor threephase asynchronous

The utility model belongs to the motor technology field, is high efficiency threephase asynchronous manufacturing.

Constantly need electrical equipment also along with variation along with what produce, and the core of electrical equipment is a motor; In recent years interrelated data shows that China's power network accounts for peak load (power consumption) to tool is threephase asynchronous, as everybody knows: these inductive loads are in operation, need from power network, draw perceptual reactive current, set up magnetic field to supply with its stator winding, so the voltage of electrical network is reduced, electric energy loss increases, thereby has hindered the output of active power; People improve power factor (PF) in order to reduce electric energy loss at present; Power capacitor is set as reactive power compensation on grid equipment, reduces electric energy loss, improve the electricity consumption economy.And overcompensation is harmful to, though this compensation makes moderate progress to loss, root problem does not solve; Reactive power compensation should and then change along with load variations, the particularly variation of inductive load, for example: factory's underload or stop work to have a rest and just can cause the undesirable transition effect of people unavoidably.Thereby people have set up in transformer station, electrical network, electric power system, and diversified reactive-load compensator and reactive power compensation control device reduce transition effect.Just at present, people are the electricity consumption economy of monopole asynchronous motor, usually dispatch from the factory and just worn start capapcitor, what have has also worn the operation capacitor, to improve the starting performance and the runnability of monopole asynchronous motor, and because the starting performance and the runnability of threephase asynchronous, all good comparatively speaking than single-phase, therefore, the present threephase asynchronous not charged container that dispatches from the factory, still: the essential reactive current that absorbs of asynchronous motor operation reduces voltage, electric energy loss increases, and hinders active power output; Simultaneously also can cause problems such as the undesirable transition effect of people owing to plant produced needs the peak of power consumption and the low ebb that produce.

The purpose of this utility model provides a kind of capacitor threephase asynchronous, and it has, and outside the function of existing threephase asynchronous, also can improve power factor, reduces transition effect and loss.

In order to achieve the above object, the utility model is on existing motor, three two-plate capacitors (three-in-one capacitor) or multipole plate capacitor have been worn, its mode of wearing and present monopole asynchronous motor basic identical (what use is the capacitor of conventional two pole plates) on monopole asynchronous motor; Three pole plate lead-out wires of three two-plate capacitors or multipole plate capacitor, and be connected on the supply terminals of threephase asynchronous, capacitor is fixed on the motor casing, and the realization threephase asynchronous is worn capacitor at random, to reach the purpose of reactive power compensation on the spot.

Owing to adopted such scheme, threephase asynchronous, reactive power compensation have on the spot been realized; Thereby, can reduce the expensive facility of reactive-load compensator and reactive power compensation control device in the electrical network, can improve the power of electric motor factor, reduce the reactive current of transmission line, reduce the wastage, improve grid supply quality, can make load terminal voltage rising, motor speed and the raising of exerting oneself, direct conditions is created in the generation that can be the middle-size and small-size threephase asynchronous of high efficiency.

Embodiment further specifies the utility model below in conjunction with accompanying drawing:

Fig. 1: be the utility model embodiment schematic diagram.

Fig. 2: be the motor wiring schematic diagram.

Among the figure, A, B, C, be three (three-phase) terminals, a, b, c, be respectively three phase windings, the 0th, winding is held altogether, U ₁, U ₂, V ₁, V ₂, W ₁, W ₂, be threephase motor winding termination, C is two plate capacitors, C ₁, multipole plate capacitor, 1 terminal block, 2 wiring copper sheets, 3 power supply wirings.

By finding out among Fig. 1: Fig. 1 _ABe to use three, the capacitor of two pole plates, capacitor threephase asynchronous circuit diagram; It is to use three present known capacitors (two plate capacitors); Three (C) capacitors, six terminations connect with triangle and are combined into three terminations, connect in parallel with threephase asynchronous; Certainly it can use the patent No.: ZL992477883 " three-in-one motor capacitor ".Fig. 1 _BBe to use multipole plate capacitor, capacitor threephase asynchronous circuit diagram; It is to use, and the patent Shen number is: in 99106700.2 " multiple-plate energy-saving capacitors ", the multipole plate capacitor of dihedral (C ₁) three terminal studs, connect in parallel with threephase asynchronous.

Y is a star connection in Fig. 2; △ is a delta connection, is found out by this figure, and its star connection and triangle all are adapted to and connect, above-mentioned capacitor; By finding out the U of power supply wiring (3) in the terminal block (1) ₁, V ₁, W ₁, be equal to A, B, C, three terminals; Thereby when reality was implemented, three terminations of above-mentioned capacitor were to be connected on, U ₁, V ₁, W ₁On; The setting of capacitor can be identical with present monopole asynchronous motor, and it can utilize certainly, and the patent No. is: the setting of ZL992432510 " connection box for motor of containing capacitor ", improve practicality of the present utility model.

Claims (1)

1, a kind of capacitor threephase asynchronous, it is made up of three phase windings, terminals, terminal block etc., it is characterized in that: on three phase windings, be parallel with capacitor (C, C ₁).