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DC Electromagnetic positive-action brake

 

 

Description and operation
Electromagnetic brake with positive operation, whose braking action is exercised in the presence of power supply.
If the electromagnet (6) power supply is absent, the mobile armature (1) is drawn by the force exerted by the anular spring (4) and allows the shaft (5) to rotate freely.
When the excitation coil (6) is powered power, it exerts the magnetic force needed to attract the mobile armature (1).
The latter overcomes the force of the anular spring (4) and engages the lining (3) attached to the stator, in turn (1) attached to the motor shaft (5) by the key (8), thereby creating a braking action.
The standard voltage for this type of brake is 24 VDC with possible variations of ±10% in the rated voltage.
This type of brake is insulated for class “B”.

Air gap adjustment
For proper operation, the air gap S [mm] between the electromagnet stator [(3)+(6)] and the mobile armature (1) must be between the limits indicated in the table (Snom-Smax).
Once the brake assembly is firmly attached to the motor, adjust using the self-locking air gap setting nut (7), checking with a thickness gauge to make sure that the desired air gap is reached.
This should be done with the brake at ambient temperature.

Braking intervention times
For the direct current brake, powered by an alternatingcurrent diode jumper, it is possible to achieve rapid braking intervention using special power packs.

 

POS.DC Brake
63
71
80
90
100
112
132
160
180
200

Snom [mm]

0,2

0,2

0,2

0,2

0,3

0,3

0,3

0,5

0,5

0,5

Smax [mm]

0,4

0,4

0,4

0,4

0,6

0,6

0,6

1,0

1,0

1,0

Cn [Nm] *

7,5

7,5

15,0

30,0

60,0

60,0

120,0

240,0

480,0

480,0

Braking time [ms]

40,0

100,0

120,0

140,0

200,0

230,0

280,0

340,0

340,0

340,0

Rapid braking time [ms]

30,0

45,0

60,0

70,0

85,0

100,0

115,0

140,0

140,30

140,50

Release time [ms]

20,0

20,0

16,0

16,0

13,0

13,0

12,0

10,0

10,0

10,0

Absorbed power [W]

11,5

11,5

16,0

21,0

28,0

28,0

38,0

45,0

70,0

70,0

Noise level [dB] **

35,5

35,5

36,0

36,0

38,0

38,0

38,0

44,5

44,5

44,5

Max speed [rpm]

6000

6000

5000

4000

3600

3600

3600

3600

3600

3600

* Braking torque
** Indicative braking values

 

1. Mobile armature

2. Hub flange

3. Clutch lining

4. Anular spring

5. Shaft

6. Coil

7. Air gap setting nut

8. Key

S. Air gap