SMAA model Magnetic DC Voltage Drum Brake
Spring applied / Electrically Released
GDA500 General Duty DC Magnet Drum Brakes
Spring applied / Electrically Released, US Navy High Speed Hoist Brakes
Spring Set DC electrically Released Drum Brakes:
Industry Type:
- General Industrial Code, Prefix: GDA
- Steel Industry Standard, Prefix: SDA
- High Integrity Nuclear, Prefix: HDA
Dimensions:
- Metric as DIN standard code: DL
- Imperial as A.I.S.E. standard code: SMAA
- Also non-standard drum sizes and base fixings
Construction:
- Fabricated steel mechanism
- Ductile iron brake shoes
- Major pivots non-ferrous bushed
- All pins ground stainless steel (lubricators optional)
- Friction linings high temperature non asbestos
Magnet:
- -DC tractive type with encapsulated coil
Special Options:
- Self adjusting mechanism (compensating for wear)
- Mechanical release lever
- Limit switches to monitor release/ set or wear
- Hydraulic override by remote pedal
- Special materials and finishes as required including high integrity specifications
- Separate enclosed control units for DC or AC supplies
Applications:
- Mechanical handling equipment, cranes, winches, elevators, lifts, also rolling mills, mixers etc.
Engineering:
- Design and selection assistance available always
DIN Brake Model Data:
| BRAKE MODEL |
DRUM DIA. “D” |
MAGNET SIZE | TORQUE MAX. |
WEIGHT |
| mm | Nm | kg | ||
| GDA100 | 100 | DA100 | 32 | 11 |
| GDA160 | 160 | DA160 | 80 | 28 |
| GDA200 | 200 | DA200 | 213 |
46 |
| GDA250 | 250 | DA250 | 362 | 64 |
| GDA315 | 315 | DA315 | 565 | 100 |
| GDA400 | 400 | DA400 | 1487 | 246 |
| GDA500 | 500 | DA500 | 1900 | 264 |
| GDA630 | 630 | DA630 | 5885 | 620 |
AISE Brake Model Data:
| BRAKE MODEL |
DRUM DIA. “D” |
MAGNET SIZE | TORQUE MAX |
WEIGHT |
| in | Lbft | Lb | ||
| SMAA4 | 4 | DA100 | 24 | 25 |
| SMAA6 | 6 | DA160 | 59 | 62 |
| SMAA8 | 8 | DA200 | 157 | 101 |
| SMAA10 | 10 | DA250 | 267 | 141 |
| SMAA13 | 13 | DAH315 | 626 | 220 |
| SMAA16 | 16 | DA400 | 1097 | 542 |
| SMAA19 | 19 | DAH500 | 2620 | 816 |
| SMAA23 | 23 | DA630 | 4000 | 1367 |
| SMAA30 | 30 | DA710 | 9000 | 1500 |
Magnetic Brake Actuator Data:
- Short stroke DC tractive type, all fabricated steel construction
- Resin encapsulated coil with Class F insulation
- Optional replaceable coil arrangement
- 100% continuously rated up to 40ºC
- Airgap dust and drip protected by neoprene qaiter
- Terminal Box IP55 standard enclosure
Brake Selection:
Characteristics of DC Magnetic Drum Brakes
All DC magnets tend to inherently show reponse due to build up and decay of the magnetic field. The actual times are dependent on brake magnet size and vary with excitation voltage, coil temperature and spring loading (torque). The magnet stroke which increases as the brake linings wear will also influence set and release times.
Coil Forcing DC Magnets (Shunt wound voltage operated)
Brake release and set times can be reduced by using an economy circuit. This separate brake control unit will initially apply full voltage to release the brake magnet, after a set time period the circuit will drop voltage to only hold off the brake. Control units are enclosed ventilated drip proof IP22 for DC supplies or totally enclosed IP55 with rectifier for 1 or 3 phase AC supplies.
Series Wound DC Magnets (Current Operated, usually inline with motor drive)
For use with crane rated DC series hoist motors to release the brake at 40% motor full load current and hold off at 10% current.