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Electromagnetic brake in AC direct current

 

 

Description and operation
Electromagnetic brake with negative operation.
The brake coil is powered through a connection to the motor terminal board in the standard version.
The standard supply voltage for the braking unit is 230/400V ±5% 50 Hz.
The braking action is exercised in the absence of power supply. When the power supply is interrupted, the excitation coil (1) is no longer powered and therefore does not exert the magnetic force necessary to restrain the mobile armature (2) which, pushed by the pressure spring (14), compresses the brake disk (3) against the motor flange on one side and the armature itself on the other, thereby creating a braking action.

Adjustment
Two different types of adjustment are possible.

Air gap adjustment
For proper operation, the air gap S between the electromagnet (1) and the mobile armature (2) must be between the limits indicated in the table (Snom-Smax); adjust using the holding screws (10) and nuts (11), using a thickness gauge to make sure that the desired air gap Snom is reached.

Braking torque adjustment
This is done using the headless screw (12) according to the instructions in the table (Cn = rated torque; ΔC = torque variation per one-quarter turn of the screw).
If the hand release lever (5) is present, once the braking torque is adjusted it is also necessary to adjust the free stroke of the lever before release begins, using the holding data of the lever itself.

 

AC Brake
230V/400V/50Hz
63
71
80
90
100
112
132
160
180
200

Snom [mm]

0,20

0,20

0,20

0,20

0,30

0,30

0,30

0,30

0,40

0,40

Smax [mm]

0,40

0,40

0,40

0,45

0,45

0,45

0,55

0,55

0,60

0,60

Cn [Nm] *

5,0

5,0

10,0

20,0

40,0

60,0

90,0

200,0

400,0**

400,0**

ΔC [Nm]

-

-

-

-

-

-

-

-

-

-

Braking time [ms]

5,0

5,0

5,0

6,0

6,0

6,0

8,0

8,0

10,0

10,0

Rapid braking time [ms]

-

-

-

-

-

-

-

-

-

-

Release time [ms]

20,0

20,0

35,0

60,0

90,0

90,0

100,0

150,0

180,0

180,0

Absorbed power [VA]

55,0

55,0

95,0

150,0

185,0

380,0

500,0

650,0

650,0

650,0

Absorbed current [A]                          Δ

 

λ

0,17

0,17

0,21

0,28

0,63

1,18

1,38

1,64

1,64

1,64

0,10

0,10

0,12

0,16

0,36

0,68

0,79

0,95

0,95

0,95

Noise level [dB] ***

68,0

68,0

69,0

69,0

70,0

70,0

70,0

70,0

70,0

70,0

Max speed [rpm]

3600

3600

3600

3600

3600

3600

3600

1800

1800

1800

Weight [kg]

1,3

1,3

1,9

3,0

9,7

9,7

10,3

14,7

24,5

36,0

* Braking torque
** Double disc brake
*** Indicative braking values

 

1. Electromagnet

2. Mobile armature

3. Release lever

4. Toothed hub

5. Release lever

6. Dust protection ring

7. IP65 protection

8. Antagonist spring

9. Spacer tube

10. Brake holding screw

11. Holding nut

12. Headless screw

13. Release lever holding screw

14. Pressure spring

S. Air gap