ElectroCraft SCA-SS-70-10

Core Technical Specifications

• Rated Supply Voltage: 24 V DC industrial bus
• Motor Continuous Torque (Motor Shaft): 2.1 N·m; Output Shaft Continuous Torque: 19.8 N·m
• Peak Stall Torque (Output Shaft): 58 N·m (300% overload for 3s)
• Rated Speed (Output Shaft): 320 RPM; Max No-Load Output Speed: 450 RPM
• Gear Reduction Ratio: 10:1 two-stage planetary gear set
• Encoder Resolution: 1000 line incremental optical encoder, quadrature A/B/Z channel output
• Control Modes: Internal velocity mode, external analog position mode, RS485 Modbus position control
• Digital I/O: 4 NPN digital input, 2 open-collector digital output
• Motor Winding Resistance: 0.82 Ω per phase; Inductance: 1.1 mH per phase
• Operating Temperature Range: -10 °C to +60 °C
• Protection Rating: IP54 standard (shaft seal IP65 optional upgrade)
• Overall Weight: 2.6 kg; Flange Dimension: 70 mm × 70 mm square mounting flange

Functional Features

1. All-in-One Integrated Architecture: Motor, gearbox, encoder, drive amplifier, and control logic integrated to reduce wiring and cabinet space occupation by 60% compared to split servo systems
2. Low Backlash Planetary Gearbox: Backlash ≤ 8 arc-minutes for high precision positioning without gear clearance error
3. Sensorless Backup Rotation: Can maintain basic velocity operation if encoder signal fails for emergency equipment retraction
4. Built-in Position Homing Logic: Configurable limit switch homing, index pulse homing, and soft-stop homing without external controller programming
5. Compact Modbus Communication: RS485 Modbus RTU supports multi-drop networking of up to 32 actuators on a single communication cable
6. Thermal Cutoff Protection: Internal NTC temperature sensor cuts output torque automatically when winding temperature exceeds 125 °C

Material Composition

• Motor Housing: Die-cast aluminum alloy with black hard anodized anti-wear coating
• Planetary Gear Components: Alloy steel (40CrNiMoA) carburized and quenched for high surface hardness
• Gearbox Housing: Cast aluminum alloy with integrated oil storage cavity
• Encencer Housing: ABS flame-retardant plastic with transparent dustproof window
• Output Shaft: Medium carbon steel with quenching and polishing treatment, keyway standard DIN 6885
• Internal Stator Lamination: Silicon steel thin sheets with insulating varnish coating
• Rotor Permanent Magnet: High-energy neodymium iron boron rare earth magnet

Structural Characteristics

• Square 70 mm mounting flange with four M6 through mounting holes for direct machine frame installation
• Coaxial linear layout: Encoder rear section → brushless motor stator → planetary gear reducer → output drive shaft
• Integrated M12 circular multi-pin connector at rear end for combined power, signal, and communication wiring
• Built-in radial shaft lip seal to block liquid and solid particle ingress from output shaft side
• Ribbed outer housing surface to enhance passive air cooling without auxiliary fans
• Removable gearbox lubrication fill plug for periodic grease replenishment

Working Principle

1. 24 V DC power supplied via M12 connector feeds internal drive PCB and brushless motor winding circuits
2. Upper control system transmits position/velocity setpoint via analog voltage or Modbus serial communication
3. Onboard 32-bit microcontroller calculates current loop reference based on position error from encoder feedback
4. Three-phase full-bridge MOSFET inverter generates variable frequency AC current to drive brushless motor rotor permanent magnets
5. Rotor torque transfers through two-stage planetary gear set to amplify output torque and reduce rotational speed at the load shaft
6. Optical encoder continuously samples shaft rotation position and feeds real-time position data back to onboard controller for closed-loop correction
7. Internal thermal and current monitoring circuits trigger torque limiting or full shutdown upon fault detection

Application Scenarios

• Medical automated diagnostic equipment linear actuators
• Small packaging rotary turntables and conveyor diverters
• Laboratory automation robotic sample transfer arms
• 3C electronics testing fixture positioning
• Light-duty material handling automated guided vehicle (AGV) steering axes
• Camera pan-tilt precise rotation platforms

Installation Requirements

1. Mount actuator rigidly to flat metal frame surface; mounting flatness tolerance ≤ 0.05 mm
2. Avoid cantilever load installation; radial overhang load limited to maximum 30 N at shaft end
3. M12 connector wiring must be strain-relieved to prevent cable pull damage to internal solder terminals
4. Maintain 15 mm minimum clearance around housing surface for air convection heat dissipation
5. For vertical downward shaft installation, select IP65 shaft seal option to prevent lubricant grease leakage
6. Load coupling must use flexible jaw coupling to absorb minor parallel and angular shaft misalignment

Operation & Maintenance Precautions

1. Initial 50-hour running-in period: Operate at ≤60% rated torque to wear gear tooth surfaces evenly
2. Replace gearbox synthetic lubricating grease every 2000 operating hours under continuous heavy load
3. Do not apply axial impact force directly to output shaft during equipment assembly; impact will crack internal gear teeth
4. Avoid operation in environments with oil mist or chemical solvent vapor that degrades shaft lip seal material
5. If encoder fault alarm activates, inspect M12 connector pin contact integrity first before disassembly
6. Do not exceed 10-minute continuous stall operation; stall rapidly overheats motor windings and demagnetizes rotor permanent magnets