CN2216304Y

CN2216304Y - Passive energy-saving self-excited motor

Info

Publication number: CN2216304Y
Application number: CN 94238285
Authority: CN
Inventors: 朱跃钢
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-09-28
Filing date: 1994-09-28
Publication date: 1995-12-27
Anticipated expiration: 2004-09-28

Abstract

The utility model relates to a motor, which realizes the reactive compensation of the inner sides of motors. The utility model is that a wiring tap is let from each stator winding, a capacitor is connected with each section of each stator winding in parallel, and the stator winding which is connected with the capacitor in parallel is connected in the shape of a triangle or a star. The loss of active electric energy caused by the flow of idle work in the motor and the power supply system is furthest reduced; the power saving effect is remarkable; the utility model is suitable for the modification of all the existing high-low voltage three-phase asynchronous motors of inductance fixing type; the motor is an ideal energy-saving motor.

Description

Passive energy-saving self-excited motor

The utility model relates to a kind of motor, particularly a kind of idle self-excitation energy-saving motor.

A large amount of at present motor of producing and using all are separated exciting electromagnetic induction motor.It needs to absorb a large amount of reactive powers from electric power system, causes a large amount of reactive powers to flow in power supply-distribution system like this and causes electric energy loss.Up-to-date " Electrometer's Unactive technology " can address the above problem preferably, but the energy loss that it causes to consume idle of motor itself and at motor internal is powerless.

The purpose of this utility model is to provide a kind of idle internal compensation of motor that has, and reduces the idle self-excitation energy-saving motor of motor electric energy loss.

The utility model is realized with following mode: idle self-excitation energy-saving motor, it comprises motor stator winding and iron core and rotor, after causing wiring tap on the every phase stator winding of motor, the two ends of every section winding in every phase stator winding also meet capacitor C, and the stator winding that connects behind the capacitor C is connected into triangle or star.The wiring tap of drawing of every phase stator winding has more than one or two.The wiring tap of drawing of stator winding is to draw at the middle part of stator winding, and stator winding is divided into common winding L1 and compensation winding L 2, on every mutually public winding L 1 and compensation winding L 2 respectively and meet capacitor C.Stator winding with and the capacitor C that connects between be that switch with the control switching is connected.The unloaded compensation capacity of compensation condenser group is the Ie(1-empty load of motor reactive power of motor when not compensating), under the rated load situation, opening-closing capacitor bank compensates to the motor rated reactive power grouping of capacitance compensation capacity.

The utility model is idle self-excitation energy-saving motor, utilizing idle self-excitation effect to adjust having of motor internal electric field and magnetic field distributes and the flow direction, make motor draw the idle idle internal compensation that becomes, reduce idle in motor interior and electric power system, flowing to the utmost and the active energy loss that causes from electric power system.It improves 0.1-0.5 than the power factor of existing energy-saving motor, reduce no-load loss 10%, being subjected to terminal voltage to improve 5-10 lies prostrate, other energy indexs all increase, the utility model is applicable to the remodeling of all high-low pressure triphase induction type asynchronous motors, is a kind of comparatively ideal energy-saving motor.

Accompanying drawing has provided the embodiment of two kinds of modes of connection of the present utility model:

Fig. 1 is the circuit theory diagrams of the utility model motor delta connection

Fig. 2 is the circuit theory diagrams of the utility model motor star-star connection

Below in conjunction with accompanying drawing the utility model is described in further detail:

Fig. 1, Fig. 2 have provided a kind of stator winding triangle of wiring tap and circuit diagram of star-star connection of drawing of the utility model.It is to draw a wiring tap from the middle part of every phase winding of threephase stator winding, stator winding is divided into common winding L1 and compensation winding L 2, on every mutually public winding L 1 and compensation winding L 2 respectively and meet capacitor C, constitute idle self-excitation energy-saving motor, this mode is the simplest during fabrication, in general after stator winding being drawn a plurality of wiring taps, again on every section winding and meet capacitor C, be connected with control switch between capacitor C and the winding, be convenient to switched capacitor C, such compensation effect is more satisfactory, but difficult during fabrication.So drawing a tap at the stator winding middle part gets final product.

Being illustrated in figure 1 as the JO2-32-2-4KW motor modifications is idle self-excitation energy-saving motor, motor stator winding L is 224 circles altogether, draw that common winding L1 is 112 circles after the tap, the compensation winding is 112 circles, through drawing two groups of building-out capacitor amounts of wiring tap parallel connection respectively for after the capacitor group of 20uF, be connected into triangle, its parameters relationship is as follows after tested:

UAB＝380V UBC＝381V UAC＝383V

Uab＝181V Ubc＝180V Uac＝181V

Empty load of motor electric current I A=3.1A when not compensating, IB=2.9A, IC=3.1A; No-load power factor COS φ.=0.12, no-load loss PO=0.19KW; Behind the input compensation capacitor, no-load current IA=1.46A, IB=1.6A, IC=1.48A, offset current ICA=1.6A, ICB=1.52A, ICC=1.58A, compensation rear motor no-load power factor COS φ.=0.22, no-load loss PO=0.16KW.

Above test result explanation, behind the motor retrofit, energy-conservation no-load loss 30W, the consumption reduction rate is 15.7%, reduces no-load current 1.4A, its economize on electricity and other resultant effect are very significant.

Claims

1, a kind of idle self-excitation energy-saving motor, it comprises motor stator winding and iron core and rotor, it is characterized in that after causing wiring tap on the every phase stator winding of motor, the two ends of every section winding in every phase stator winding also meet capacitor C, and the stator winding that connects behind the capacitor C is connected into triangle or star.

2,, it is characterized in that the wiring tap of drawing of every phase stator winding has more than one or two according to the described energy-saving motor of claim 1.

3, according to the described energy-saving motor of claim 1, the wiring tap of drawing that it is characterized in that stator winding is to draw at the middle part of stator winding, stator winding is divided into common winding L1 and compensation winding L 2, on every mutually public winding L 1 and compensation winding L 2 respectively and meet capacitor C.

4, according to the described energy-saving motor of claim 1, it is characterized in that stator winding with and the capacitor C that connects between be that switch with the control switching is connected.

5, according to the described energy-saving motor of claim 1, the unloaded compensation capacity that it is characterized in that the compensation condenser group is the Ie(1-empty load of motor reactive power of motor when not compensating), under the rated load situation, opening-closing capacitor bank compensates to the motor rated reactive power grouping of capacitance compensation capacity.