SA57 DRN90S4/BE2 SEW EURODRIVE Reducer Motor 1.1kw M2A 56.61 50Hz

1.Overview of the SA57 DRN90S4/BE2 SEW EURODRIVE

The SEW SA57 DRN90S4/BE2 is a 1.1 kW, 4-pole helical-worm gear reduction brake motor with a speed of approximately 1,440 rpm at 50 Hz. Through the SA57 reduction gearbox, the typical output speed is 74 rpm (speed ratio approximately 19.5), and the output torque reaches 140 Nm. This motor features the new IE3 energy efficiency rating, an aluminum alloy housing, Class F insulation, and IP55 protection, suitable for continuous S1 operation in ambient temperatures of -20°C to +40°C.

It also integrates a BE2 24 V DC power-off brake with a braking torque of 25 Nm, a response time of <20 ms, and a friction plate life of >20,000 cycles, ensuring quick and safe stopping of vertical or inertial loads. The motor end cap is equipped with an ISO 9409-1 flange and an incremental encoder interface (1024 ppr), enabling plug-and-play integration with frequency converters and servo controllers for closed-loop vector operation or positioning control.

The entire unit features a modular design: the gearbox, motor, brake, and encoder are detachable, eliminating the need for complete disassembly for maintenance. The gearbox is factory-filled with long-life grease, ensuring a maintenance-free life of 20,000 hours. The housing is reinforced using finite element analysis, increasing the axial load capacity to 800 N while maintaining a lightweight design. It can directly withstand radial forces from sprockets, pulleys, or couplings.

The SA57 DRN90S4/BE2 is widely used in conveyor lines, elevators, packaging machines, ceramic machinery, food mixing, and warehouse stacking applications requiring low to medium speeds, high starting torque, and safe braking. It is one of SEW-EURODRIVE's most cost-effective gear brake motors in the 1.1 kW segment.

2.Core Features:

I. Core Applications
Continuous or intermittent equipment with low to medium speeds, high starting torque, and requiring safe braking
Typical machinery: chain/belt conveyors, elevators, packaging machines, ceramic/food mixers, and warehouse stacking

II. Motor Specifications
Model: DRN90S4 (cast iron housing)
Rated power: 1.1 kW (S1 duty)
Number of poles/frequency: 4 poles, 50 Hz
Rated speed: 1,440 r/min⁻¹
Energy efficiency class: IE3 (≥ 84% @ 1.1 kW)
Insulation/temperature rise: Class F, ∆T = 80 K
Protection class: IP55 (standard), IP56 optional
Ambient temperature: –20°C to +40°C (standard lubrication)
Mounting options: B5 (flange) + B14 (small flange) optional, any angle, M1-M6
Bearing: 6205-2Z C3, lubrication life: 20,000 h
Permissible axial load: 800 N (continuous)

III. Gearbox Parameters
Gearbox Model: SA57 (helical gear-worm gear combination, 3 stages)
Speed ​​Ratio (Typical): i = 19.54 (factory configuration)
Output Speed: 74 rpm (at 50 Hz)
Output Torque: 140 Nm (Service Factor fs = 1.0)
Maximum Acceleration Torque: 210 Nm
Efficiency: 92% (first stage helical gear) × 70% (worm gear) ≈ 64%
Lubrication: CLP VG 220 synthetic oil, maintenance-free for 20,000 hours
Noise: ≤ 62 dB(A) (1 m, 50 Hz, no-load)
Casing Material: HT200 gray cast iron, plastic-sprayed finish
Output Shaft: Ø30 mm (h6 × 60 mm), Keys: 8 × 7

IV. BE2 Brake Parameters
Braking Principle: DC power-off braking (power-off holding brake)
Supply Voltage: DC 24 ±10% V
Braking torque 25 Nm (rated)
Response time < 20 ms (release), < 30 ms (engage)
Friction lining life ≥ 20,000 cycles (full torque)
Manual release: Standard manual release lever for emergency release on the motor side
Protection IP55, same rating as the motor

V. Encoder Option (factory-installable)
Incremental TTL 1024 PPR, 5 V or 24 V power supply
Signals A/B/Z with UVW commutation (compatible with MOVIMOT® and MOVIDRIVE®)

VI. Features and Benefits
140 Nm output at 0 Hz, enabling direct start at full load without soft start
Right-angle shaft extension and a gearbox radial dimension of only 200 mm save installation space
Modular three-stage design: Motor, brake, and gearbox can be independently disassembled and assembled, reducing maintenance downtime by less than 10 minutes
Dual-channel cooling ducting reduces temperature rise by 15% compared to conventional models % to extend insulation life.
The brake features an integrated microswitch for remote monitoring of brake release/wear status.
The terminal box is rotatable (3 x 120°), eliminating the need for on-site cable kinking.
Factory-filled with long-term grease, with -20°C low-temperature grease optional, making it truly maintenance-free.
Plug-and-play with SEW inverters (MOVITRAC® LTP-B / MOVIDRIVE® B), supporting closed-loop vector, positioning, and synchronous servo modes.

VII. Typical Applications
Chain conveyor, 30 m, 2 t load, horizontal conveyance, 0.4 m·s⁻¹
Ceramic brick press powder feed belt, requiring frequent forward and reverse rotation and brake holding
Food mixing pot, 500 kg batch size, 70 rpm⁻¹, requiring IP55 washdown
High-bay warehouse elevator, 1 t load, brake de-energized, pressure-maintaining, anti-fall

3.Product details pictures

4. Related products

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