Technical Specifications

• Nominal Rated Operating Voltage: 24 VDC
• Continuous Rated Output Power (S1 Continuous Duty): 120 W
• Continuous Stall Torque: 0.38 N·m
• Peak Overload Torque: 1.14 N·m, maximum 1-second overload cycle
• Rated Continuous Rotation Speed: 3500 rpm
• Maximum Mechanical No-Load Speed: 6000 rpm
• Commutation Mode: Graphite carbon brush mechanical commutator
• Integrated Brake (A3 Suffix): Power-off spring holding brake, static holding torque 0.42 N·m, 24 VDC brake release coil
• Shaft Specification: 6 mm diameter smooth solid output shaft
• Mounting Flange Standard: 42 × 42 mm miniature square aluminum mounting flange
• Overall Motor Length (with integrated brake): 96 mm
• Net Weight: 0.78 kg
• Insulation Class: B-grade (130 °C maximum winding temperature)
• Protection Rating: IP54 housing and shaft sealing
• Operating Ambient Temperature Range: 0 °C to +40 °C
• Storage Temperature Range: -40 °C to +85 °C
• Certifications: CE, RoHS 2

Functional Features

1. Miniature 42 mm flange ultra-small body design adapts to ultra-narrow mechanical installation space of desktop and portable automation equipment
2. Ferrite permanent magnet rotor structure delivers stable low-speed torque output with low manufacturing cost
3. Integrated power-off holding brake locks motor shaft instantly after brake coil power loss to prevent vertical miniature load gravity sliding
4. Replaceable miniature carbon brush cartridge for convenient on-site maintenance without complete motor disassembly
5. Embedded winding PTC thermal sensor provides real-time overtemperature monitoring and drive protection trigger signal
6. Single shared terminal block integrates motor armature power wiring and brake coil wiring to simplify on-site cable layout
7. Low electromagnetic radiation design avoids signal interference to surrounding miniature sensors and optical components

Performance Highlights

1. Ultra-high torque-to-volume ratio miniature structure realizes high output torque under limited mechanical installation space
2. Brake static holding torque exceeds motor continuous stall torque, eliminating vertical miniature load slip risk under power-off state
3. Optimized commutator and carbon brush contact structure reduces electrical noise and speed fluctuation below 1 rpm low-speed operation
4. Compact lightweight design reduces overall equipment moving platform payload weight for high dynamic response miniature axes
5. 70,000-hour carbon brush service life under rated continuous low-load operating conditions

Material Composition

• Motor Housing: Thin-wall die-cast aluminum alloy matte black anodized casing
• Stator Winding: B-grade enameled copper magnet wire
• Rotor Magnet: Sintered ferrite permanent magnet ring
• Commutation Assembly: Copper commutator segments, low-wear graphite carbon brush elements
• Brake Unit: Steel friction disc, stainless steel compression spring, copper brake coil winding
• Output Shaft: Precision ground 4130 alloy steel solid shaft with anti-rust passivation treatment
• Bearing Parts: Miniature sealed single-row deep groove ball bearings front and rear

Structural Characteristics

1. 42×42 mm miniature standard square mounting flange with four M3 symmetrical threaded mounting holes
2. Middle body reserved independent side access cover for carbon brush cartridge replacement without brake module disassembly
3. Front motor body + rear integrated brake two-section stacked compact assembly layout to minimize overall motor length
4. Single front-end wiring terminal block concentrates armature power and brake coil wiring terminals
5. Single-row miniature double bearing support limits shaft radial and axial play within ≤ 0.015 mm

Working Principle

1. BDS4 series low-voltage servo drive outputs adjustable DC armature current to motor stator winding; mechanical commutator and carbon brush sequentially switch armature current phase to generate rotating magnetic field
2. Ferrite permanent magnet rotor interacts with stator rotating magnetic field to produce continuous rotary torque driving miniature mechanical load
3. 24 VDC energized brake coil generates electromagnetic suction force to compress internal spring and release friction disc for free shaft rotation; power cut removes electromagnetic force, spring pushes friction disc to lock output shaft mechanically
4. PTC thermal sensor embedded inside stator winding transmits resistance temperature signal to servo drive; drive reduces output current or triggers fault stop once winding temperature exceeds safe threshold
5. Optimized micro air gap magnetic circuit design suppresses torque ripple to guarantee stable uniform rotation at ultra-low operating speed

Advantage Highlights

1. 24 VDC low-voltage operating specification eliminates high-voltage safety protection design requirements for small battery-powered portable equipment
2. All-in-one motor with integrated brake reduces mechanical assembly part quantity and fixture design difficulty for miniature automation equipment
3. Side-mounted brush replacement access cover greatly shortens on-site maintenance operation time and labor cost
4. IP54 dust-proof sealing grade can be installed in semi-open workshop environment without full sealed cabinet protection
5. Full compatibility with all BDS4 series low-voltage digital servo drives, one-click auto-tuning without manual parameter input

Applicable Industries

Installation Requirements

1. 42 mm mounting flange surface flatness tolerance ≤ 0.03 mm; uneven mounting surface generates abnormal bearing vibration noise
2. Shaft coupling radial misalignment limited to ≤ 0.02 mm; miniature elastic coupling mandatory, rigid direct shaft connection prohibited
3. M3 mounting screw tightening torque fixed at 0.6 N·m; over-tightening deforms thin aluminum flange plate
4. Brake coil wiring must be separated from motor power cables with shielded twisted pair to avoid PWM current interference causing brake release failure
5. Any mounting spatial orientation permitted; vertical downward shaft installation needs auxiliary dust-proof cap to prevent dust accumulation on shaft seal

Operation & Maintenance Precautions

1. Cut off both motor armature power and 24 V brake power supply before opening brush access cover to avoid unexpected shaft rotation injury risk
2. Replace carbon brush cartridge immediately when residual brush length is less than 2 mm; excessively worn brush scratches copper commutator permanently
3. Brake friction disc surface must be kept clean and oil-free; any grease contamination reduces holding torque sharply
4. Prohibit continuous operation above +40 °C ambient temperature; long-term high temperature causes ferrite magnet irreversible demagnetization
5. Do not extend original wiring harness via random wire splicing; splice points introduce resistance and electromagnetic signal interference faults