SU1684823A1 - Electromagnetic friction brake - Google Patents

Abstract

The invention relates to electrical engineering and can be used in electric drives of automated control systems, in particular for assembling electric motors used in feed drives of automated machine tools and automatic manipulators. The aim of the invention is to improve the reliability of the electromagnetic friction brake by monitoring its operation. The state of the electromagnetic friction brake control circuit consists of a controllable key, an alarm relay and a readable magnetically controlled element and allows monitoring the brake status by signal devices and Avoid turning on the mechanism when the brake is jammed. 2 Il. a

Description

The invention relates to the field of electrical engineering and can be used in electric drives of automated control systems, in particular for the assembly of electric motors used in feed drives of automated machine tools and automatic manipulators.

The aim of the invention is to increase the reliability of the electromagnetic friction brake by monitoring its response.

Fig. 1 shows a general view of the proposed brake (in Fig. 2, the electrical circuit of its control is a principal one.

The electromagnetic friction brake consists of a friction brake assembly and an electromagnetic drive. The latter contains a winding 1, a permanent magnet 2 and a magnetic core 3 attached to the flange 4 of an electric motor. The friction brake assembly contains a disk edge 5, a brake disk 6 in the form of an elastic membrane fixed to shaft 7 by means of a collet clamp 8, and a brake surface 9 formed at the end of the magnetic conductor 3. The control circuit contains a coil of contactor Yu, one of the conclusions 11 of which connected via control pin 12 to one of the terminals 13 for connecting a power source. The closing magnetically controlled element 14, for example, a reed switch, is arranged to interact with the scattering fields of the permanent magnet 2 and is connected to the control circuit between the other terminal 15 to connect the power supply and the other terminal 16 of the coil of the contactor 10. Power circuits05

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m I-- i l 1 J iro if ch i ieji, i obmogkl 1, M; m HP, i HTK. The im Schamnia electromotor ir-h brakes, the locking short-circuiting megapixels and 7 7 are also connected directly to the winding circuit 1, Hole 20 of the control key 21 is connected to the output terminal 11 of the contactor coil 10 and to the market 15 to connect the power source. The output 22 of the key 21 is connected in parallel to the magnetically controlled element 14, the winding of the alarm relay 23 is connected between the terminals 13 and 16. For the visual control of the state of the hormone, use a cng lamp 24, in series with which the amychAcoupler 25 of the relay 23 is connected. Control 141 mp key 21 contains the key element 26 and the control unit 27, which sets the time, R for which the key element 26 goes and is kept in the closed state. The key element 26 can be made, for example, in the form of a make contact of an intermediate relay, the power supply to which the winding is supplied during the time that is filled in by the block 27.

Electromagnetic friction brake rbotat as follows,

In the initial state, when the terminals 1, 15 are connected to the power source, the supply voltage is applied

and the contactor coil 10 is de-energized. Therefore, the contacts 17 are open and the voltage on the winding 1 of the brake is not applied. In this case, under the action of the magnetic field of the permanent magnet 2, the measles 5 are attracted to the magnetic conductor 3 all the way to the braking surface 9, i.e. the brake is closed and the shaft 7 is inhibited. Since the magnetic circuit of the permanent magnet is almost absent when the core 5 is attracted, the fluxes of its magnet are insignificant and the magnetically controlled element 14 remains pa3OMKHvp.it-, breaking the winding circuit of the relay 23. Non-23 is open and 24 is not illuminated. signaling that the brake is closed.

When the contact is closed, the 12-t pressure applied a voltage to the input 20 of the switch 21, and due to the connection with the (. 11 key control): u; .IMH 10

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1 i, ii Vn; pr1 l and h f i I i,, ii im f from a torus 10 n jif i 1 M m-, | IMFMWI connected g power source 1 tripped and their contacts 17 and 25 zlmmkayugsch. At the same time, the lamp 24 is tajigchetsn, the state of control that the control key 21 has been triggered, the winding 1 is also energized, and it creates a magnetic flux directed oppositely to the magnetic flux of the permanent magnet 2. It is attracted to the cortex 5 and decreases under the membrane deformation 6 moves away from the magneto line 3, t, e, the brake is opened and the shaft 7 is released. The flux of a permanent magnet 2 due to the occurrence, v (stuffy gap between the 5 t core: magnet duct 3 sharply increases and closes the magnet control of the cell 14, the key element 26 remains closed due to the signal from block 27 , After the time set by block 27, the key element 26 opens. However, since element 14 is closed, the coils of contactor 10 and relay 23 remain under voltage. Thus, windings 18 and 1 also remain under voltage, and signal lamp 24 lights up signaled If for some reason, after applying voltage to winding 1, the brake has not opened (for example, due to break in winding 1) and there is no gap between the core of 5 t: magnetic core, the magnet 2 does not increase and the magnetically controlled element 14 remains open, then after the time set by block 27, the key element 26 opens and breaks the supply circuit of the coil of contactor 10. Contacts 17 open, disconnecting the electric motor and brake from the power circuit, preventing they operate in emergency mode while mistakenly closed brake, and the warning light 24 goes off, signaling that the shutdown of the motor due to malfunctions is the brake,

If during normal operation of the battery, when it is in the open position, open contact 12 of the control, then the supply circuit of the coil of the contactor 10 is broken. Thereby

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 I f; I 1 P I lri-POH NOP11. fill - IMM Hh ft 110 1 PR mbmoT Y And 1 PchechaOG and ANCHOR h PPL D (IC 1 Hl PM MLTNRGP MP - GOKYA PERMANENT ML1NITL PrETYAGILEp with kmglit opopo. The flow of dissipation of this ml and pit 2 decreases sharply and the thin-controlled element 14 disconnects, breaks the circuit of the relay coil 21. The contact 25 of the relay 23 opens and the signal lamp 24 stops to light, indicating that the brakes are closed.

If, for any reason, the POOLR of the raskmanik of the control contact 12 and the removal of voltage from the winding 1, the brake is not interrupted (for example, during mechanical jamming of the core), the magnetic control element 14 will remain open. Then the relay 23 continues to be energized to the winding, the contact 25 is closed and the signal lamp 24 is illuminated, indicating that the brake is not closed. At the same time, the voltage to the windings 18 and 1 is not supplied because the control terminal 12 is open.

Claims (1)

Depending on the application and operating conditions of the brake, for example, when it is used in electric motors of the drive for supplying CNC machines, the motor and brake can be controlled according to an operation algorithm embedded in the CNC considering the state of the brake controlled by closing or opening 25 Relay 23. Claims of invention Electromagnetic friction brake containing disconnecting friction M I pi ,,, - G 1 (: l g and I rl i I T 1, G (N Chin NN, HH) f G PCS, and rlmtsch .iciruiMi ccc if, brake took into account t m h i ft i i ANCHOR, BRAKE TP HL L And Inp-n-M1, gungrngsti, reverse-shnon yl t, rp (mlg of pipeline, let us take rgmit (M11,, j}, c and chkor) r RO-U-IO HOI it to the relative displacement n ib; iii. l and h so that, for the purpose of fullness of the basement by providing a bogokolklnogo kontrotch his workpieces, it is equipped with a control circuit containing a contactor, a contact pr p and two outlets for connecting the source 20 the nickname of the key-controlled power the alarm relay and the closing magnetically controlled element, the latter being fixed on the magnetic wire with the possibility of operation from the fields of the permanent magnet scattering, the first output coil of the contactor is connected to one of the power supply terminals via a control contact, and the second output of the contactor coil is connected via a closing magnetically controlled element to the other, the power supply terminal, the control switch key is connected to the first coil output the contactor and to another output of the power source, the output of the control key is connected in parallel to the closing magnet control of the element, and the winding of the alarm relay is connected between one output power supply and a second terminal of the contactor coil. figl