CN2196207Y

CN2196207Y - Energy saving brake electromagnet

Info

Publication number: CN2196207Y
Application number: CN 94211860
Authority: CN
Inventors: 温广仁; 叶菘
Original assignee: HENGHE ELECTRONIC PRODUCTS CORP BEIJING CITY
Current assignee: HENGHE ELECTRONIC PRODUCTS CORP BEIJING CITY
Priority date: 1994-05-11
Filing date: 1994-05-11
Publication date: 1995-05-03
Anticipated expiration: 2004-05-11

Abstract

The utility model belongs to an improved technical field of the AC electromagnet with an armature. In order to overcome disadvantages of the oversize air gap between the traditional electromagnet heel piece and the armature, low conversion efficiency of the electromagnet and low dependability, the utility model adopts measures that the whole magnet circuit is formed by a case in place of the heel piece; an armature control axial trough is arranged on the rear cover; the armature is arranged in and is slide-assembled with the armature control axial trough; the control circuit adopts coil connection in series and is provided with a bleeder circuit to enhance the dependability of the electromagnet. Comparing to the traditional structure, the utility model can save electricity above 90% and is an ideal power save product with advantages of long service life and low costs.

Description

Energy saving brake electromagnet

The utility model belongs to a kind of improvement technical field that the alternating electromagnet of armature is arranged.

Alternating electromagnet is mainly as the control unit in the automation electrical equipment such as various breaks, solenoid valve, relay, contactor.Electromagnet in the past mainly is made up of yoke, armature, pull bar, coil.Yoke and armature are to be formed by stacking by silicon steel plate, and the air gap of yoke and armature is excessive, and electromagnetic conversion efficient is low must to apply the stronger magnetic field of big electric current formation, just can guarantee electromagnetic actuation.Therefore coil need be done very greatly, and then causes the increase of electromagnet volume and weight, and working life is also lower.Still keep with big electric current behind the electromagnetic actuation in addition, energy loss is big, and coil easily burns.Chinese patent 2046675 publication numbers are divided into magnet spool: starting coil and keep coil, and two coils from parallel connection of coils, two groups of coil electricities during startup, the little electric current of impedance are big.After the armature adhesive, disconnect starting coil, the big electric current of impedance is little, thereby realize that big current start, little electric current keep in the hope of economize on electricity, but not enough be that starting coil disconnects the mechanical contact arcing under big electric current, not only easily damage the contact, reliability also reduces, and also may cause on-the-spot fire.

Therefore, the purpose of this utility model is: design a kind of energy-conservation Breake Electromagnet, realize contactless current switching (explosion-proof), and economize on electricity and the high advantage of reliability are arranged.

The utility model realizes that the method for purpose is: bonnet is provided with armature control axial trough, the armature rear portion be positioned at armature control axial trough and with its sliding joining, the displacement process of armature is to carry out in armature control axial trough, armature is controlled the axial trough rear end and is provided with through hole.The shell that constitutes whole magnetic loop is made with low-carbon steel material, in order to improve electromagnetic conversion efficient.Have in control circuit by capacitor C 1, resistance R 1 and transistor BG1 form the leadage circuit of the electric charge of supplying with timing capacitor C2.In order to improve the reliability of work of electromagnet, the said structure design has realized the purpose of this utility model.

The utility model has the advantages that: the shell that constitutes whole magnetic loop has substituted a large amount of silicon steel plates, and its shell itself plays the effect of yoke, and the shell of formation sealed mode can also shield to coil.At its rear portion of whole displacement process that is provided with armature control axial trough, armature on the bonnet all is to carry out in axial trough, and axial trough and armature rear portion cunning are joined, and make the armature rear portion form mobile axle.In circuit, add the charge discharging resisting circuit, guaranteed electromagnet correct adhesive and release when frequent use the fast.

Below in conjunction with Figure of description and embodiment structure of the present utility model is further described.

Fig. 1, be the utility model structural representation

Fig. 2, be the circuit theory diagrams of control circuit for electromagnet

With low-carbon steel material one-step casting shell 1 of the present utility model; select for use permeability magnetic material low carbon steel to form the enclosed shell mechanism; winding starting coil 10 and current-limiting inductor 6 are fixed in the enclosure on the skeleton 5 that insulating material is made; shell not only plays protection fixed coil and the effect that is connected bonnet 2 and control circuit 7, constitutes whole magnetic loop for again electromagnet itself.One end of push rod 4 pass shell front end center portion be connected armature 3 in the heart, the other end withstands on the mechanical connecting element that needs braking, the adhesive by electromagnet produces the push rod locomotivity with the control mechanical connecting element.

Make bonnet 2 with low carbon steel, the center portion of bonnet is provided with armature control axial trough 8, the armature rear portion is positioned at it and joins (for the tratitional technology structure) with its cunning, armature is to carry out in armature control axial trough in the whole displacement process behind the electromagnetic actuation, axial trough makes armature front portion, the unsettled surface of contact that has reduced armature and skeleton inner casing in middle part, thereby has reduced armature surface friction drag.Required inrush current and magnetic intensity reduce significantly.Cause resistance of air for preventing to make after armature and armature control axial trough cunning from joining in the axial trough air to cut off, be provided with through hole 9 in the axial trough rear end on the bonnet so that inside and outside the shell atmosphere communicate.Bonnet is fixed on outer casing back by traditional connecting means, and control circuit 7 also is fixed on the shell, and armature also can adopt low carbon steel to make.

The circuit theory diagrams of control circuit for electromagnet 7 as shown in Figure 2, the electromagnetic conversion of electromagnet is that the coil L1(by 2 series connection is a starting coil) and L2(be current-limiting inductor) constitute, the moment L2 short circuit that power switch K closes has electric current to flow through in the L1, no current flows through in the L2 coil.There are enough electric currents to flow through during startup on the L1 and make electromagnetic actuation, reduce supply current in the loop, keep the attracting state of electromagnet with little electric current, in the hope of economizing on electricity when time-delay behind the electromagnetic actuation seals in current-limiting inductor L2 electromagnetic circuit a period of time.

Whole control circuit for electromagnet can be divided into: electromagnetic circuit, trigger circuit, delay circuit and charge discharging resisting circuit.

Magnetic circuit is a drive part; by coil L1 and L2, resistance R 8, R9, R10; transistor D2, D3, D4 form; coil L1 and L2 serial connection, and sustained diode 2 in parallel, D3 and top series resistors R8, R9 respectively, line voltage is too high when preventing work; cause that components and parts damage; in circuit, be provided with the piezoresistance R10 of an energy, insert fus BX, constitute dual-protection circuit for preventing overcurrent to voltage-sensitive.Commutation diode D4 becomes dc pulse electricity to sinusoidal ac and supplies with coil L1 and L2, thereby produces electromagnetic conversion, and two sustained diode 2, D3 are for L1 and L2 provide one can make the releasable path of electromagnetism.In circuit, increase R8 and two resistance of R9 for reducing time constant, time constant is diminished, accelerated the conversion and the release of electromagnetic energy, thereby reduce transient current among L1 and the L2, help the reliably working of electromagnet the electromagnet influence of release time.SCR is single-phase silicon-controlled, its effect be moment that power switch K closes to before electromagnet is also not in the adhesive with coil L2 short circuit.Make to produce in the L1 than big electric current to be beneficial to electromagnetic actuation, because L1 is an inductive load, the sharp pulse on the R5 is very narrow, reliably conducting of SCR, resistance R 7 is connected in series SCR so that in the moment of switching on enough anode current is arranged, with the reliable conducting of controllable silicon, so that the reliable adhesive of electromagnet.Form thyristor gating circuit by unijunction transistor UJT and resistance R 3, R4, R5, capacitor C 3, C4, the basic pattern of unidirectional controllable silicon S CR trigger circuit is unijunction transistor UJT and anti-interference capacitor C4 arranged, and the trigger end of SCR is connected on the branch road that resistance R 5 and unijunction transistor UJT be connected into.For preventing controllable silicon SCR false triggering under power network fluctuation and the influence of electric public hazards, designed C4 in the circuit.Delay control circuit is made up of transistor BG2, resistance R 2, R3, diode D1 and timing capacitor C2, is used for the control triggering electric circuit timing working.Serial connection diode D1 and capacitor C 2 so that the voltage on the C2 can have the triggering of a step type to the BG2 base stage, make BG2 only be operated on off state before the base stage of BG2.

Form the leadage circuit of supplying with timing capacitor C2 electric charge by transistor BG1, resistance R 1 and capacitor C 1, the base stage of BG1 has C1 and R1 series connection, and BG1 is carried out instantaneous trigger, so that C2 bleeds off electric charge, guarantees correct adhesive and the release of electromagnet when frequently using fast when each energising.For reducing the fluctuation of voltage, make control time-delay part that a better working environment can be arranged, reference diode DW in parallel is stabilized in a fixed numeric values with its voltage between quenching resistor R6 and BG1 emitter.

The circuit working process is as follows: in the moment of power turn-on K switch, because the voltage at capacitor two ends can not suddenly change, so the voltage at C2 two ends is zero volt, BG2 ends, the trigger circuit work that unijunction transistor is formed.Controllable silicon is opened, and coil L2 is by short circuit, and L1 works, electromagnetic actuation; Meanwhile power supply also charges to C2 by R6 and R2, the current potential of C2 is risen, behind electromagnetic actuation, the current potential of C2 rises to and makes BG2 conducting (delay time is greater than the electromagnetic actuation time), at this moment thyristor gating circuit quits work, and controllable silicon SCR is turn-offed, current-limiting inductor L2 seals in electromagnetic circuit, and L1 and L2 have electric current to flow through, electromagnet enters keeps adhesive, promptly makes armature continue to keep adhesive with little electric current.Have no progeny when power switch K closes, electromagnet discharges,

If K switch is closed once more, power circuit begins time-delay for the second time, and is too short as adjacent twice blanking time, and capacitor C2 has little time to have put electricity, has remaining voltage potential must influence the accuracy of time-delay next time on the C2.The leadage circuit of being made up of C1, R1, BG1 is in the moment of power turn-on K switch, and it is zero substantially that the collector and emitter of the electric charge on the C2 by BG1 is released to.Then power supply ends BG1 after by R6 C1 being charged, and circuit enters the time-delay state.

With the MZJ type Breake Electromagnet of the utility model made than the economize on electricity more than 90% relatively of the MZD Breake Electromagnet of existing use, economize on electricity 90% when wherein starting, economize on electricity 97% when keeping, and volume is little, in light weight, cost is low, long service life, the electromagnet reliability greatly improves.

Claims

1, a kind of energy-conservation Breake Electromagnet, by shell (1), bonnet (2), armature (3), push rod (4), skeleton (5), starting coil (10), current-limiting inductor (6) and control circuit (7) are formed, it is characterized in that: bonnet is provided with armature control axial trough (8), the armature rear portion is positioned at armature control axial trough (8), and with its sliding joining, the displacement process of armature is to carry out in armature control axial trough, armature control axial trough rear end is provided with through hole (9), the shell that constitutes whole magnetic loop is made with low-carbon steel material, has in control circuit by capacitor C 1, it is that resistance R 1 and transistor BG1 form so that timing capacitor C2 goes up the circuit of charge discharging resisting.

2, by the described a kind of energy-conservation Breake Electromagnet of claim 1, it is characterized in that: be in series with resistance R 8, R9 on coil L1 and L2 sustained diode 2 in parallel respectively, the D3 in the control circuit (7), piezoresistance R10 in parallel in total loop, the basic pattern of unidirectional controllable silicon S CR trigger circuit is unijunction transistor UJT and anti-interference capacitor C4 is arranged, serial connection diode D1 and capacitor C 2 before the base stage of BG2, the base stage of BG1 has capacitor C 1 and resistance R 1 series connection, and unidirectional controllable silicon S CR is serially connected with resistance R 7.