Empowering Smart,
Practical Automation.

High-performance Brushless DC Motors & Servo Joints

Crafted for Motion Control.

Our Products

OEM & Solutions

We specialize in comprehensive electric motor solution services.

COSMOTR serves as the international office of COSTR, a leading electric motor manufacturer based in Huizhou, China. Together, we provide global clients with large-scale motor supply, high-quality OEM manufacturing, and advanced R&D services.

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Our Electric Motors Technical Focus

Drive Motors for Power Systems

Advanced alternatives to traditional traction motors. We integrate precision temperature and speed monitoring in design, delivering optimized torque control for high-end applications such as EVs, AGVs, and motorized platforms.

Industrial Automation Motors

Electric Motor solutions tailored for automation lines. Designed for high performance and low cost, our motors adapt to diverse production environments, enhancing efficiency in automated systems.

Robotics Motors

Customized motor solutions for high-performance robotics. Covering various joint modules, our series supports intelligent sensing, high torque, flat profiles, modular integration, and large joint designs.

High-End Brushless Electric Motor OEM From China

High-End Motor OEM

Customized electric motor solutions for high-performance robotics. Covering various joint modules, our series supports intelligent sensing, high torque, flat profiles, modular integration, and large joint designs.

Smart
Automation Integration

Applications include industrial automation, dexterous manipulation, embodied intelligence, service robotics, and advanced vehicle systems.

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Brushless DC Motors for Motion Control

After over a decade of R&D, Cosmotr (Costr) has developed three mature and independently designed product lines of high-torque brushless DC motors, lightweight servo motors with encoders, and coreless motors. Our motors are widely applied in robotic joints, industrial automation, and traction drive systems.

EARTH EA6010
High-Performance Brushless Motor
High-Speed 48V Brushless Motor – 4,000 rpm, Compact Ø68mm
Stator Specification: 60 / 18 slots
Stator Thickness: 10
Torque: 1.24 N·m (rated), 6.79 N·m
Output: Flange / Shaft Output
JUPITER JU18030
High-Performance Brushless Motor
High-Speed 75V Brushless Motor – 2,000 rpm, Compact Ø198mm
Stator Specification: 186 / 36 slots
Stator Thickness: 30
Torque: 33 N·m (rated), 864 N·m
Output: Flange / Shaft Output
PROTON PR60
Brushless Servo Motor
Power: 500 W; Diameter: Ø67 mm; Length: 23 mm; Weight: 300g
Rated Voltage: 42VDC
Up to 4,200 rpm (no-load), 3,000 rpm (rated)
Torque: 0.66 N·m (rated), 2 N·m
Resolution: 16384 (14-bit) Step/turn
SUPERSONIC CY1226
Extreme Speed Coreless Motor
Diameter: Ø12 mm; Length: 30.8 mm; Weight: 16.5g
Rated Voltage: 12VDC
Up to 29000 rpm (nominal), 24200 rpm (max-efficiency)
Torque: 1.30 mNm, 41.19 mN·m (max-power)
Max-efficiency: 64.5%
SATURN SA13030
High-Performance Brushless Motor
High-Speed 75V Brushless Motor – 4,300 rpm, Compact Ø148mm
Stator Specification: 137.6 / 36 slots
Stator Thickness: 30
Torque: 18 N·m (rated), 1035 N·m
Output: Flange / Shaft Output
ELECTRON EL20
Brushless Servo Motor
Power: 36 W; Diameter: Ø29 mm; Length: 13.5 mm; Weight: 50g
Rated Voltage: 42VDC
Up to 6,000 rpm (no-load), 4,000 rpm (rated)
Torque: 0.023 N·m (rated), 0.069 N·m
Resolution: 16384 (14-bit) Step/turn
PULSTRA MC0623
Extreme Speed Coreless Motor
Diameter: Ø6 mm; Length: 28.3 mm; Weight: 4.0g
Rated Voltage: 12VDC
Up to 63200 rpm (nominal), 53240 rpm (max-efficiency)
Torque: 0.43 mNm, 8.47 mN·m (max-power)
Max-efficiency: 64.9%

View All Motors

Next-Gen ProServo Robot Joints

The proServo line includes both planetary and harmonic reducer modules. Each joint integrates a compact servo drive and delivers high torque with precision, ideal for collaborative robots, dexterous hands, and bionic limbs.

COSTR. ProServo PP05
Micro Servo Joint with Planetary Reducer
Ø 32mm; Length 33.4mm; 82g
Rated Voltage: 24V
Rated Power: 35W
Speed: 50rpm (rated), 200rpm (no-load)
Torque: 0.2 N·m (rated), 0.48 N·m (peak)
COSTR. ProServo PP08D
Micro Servo Joint with Planetary Reducer
Ø 40mm; Length 48mm; 199g
Rated Voltage: 24V
Rated Power: 36W
Speed: 50rpm (rated), 50rpm (no-load)
Torque: 1.0 N·m (rated), 2.2 N·m (peak)
COSTR. ProServo PP11L
Micro Servo Joint with Planetary Reducer
Ø 52mm; Length 82mm; 517g
Rated Voltage: 24V
Rated Power: 72W
Speed: 50rpm (rated), 50rpm (no-load)
Torque: 12 N·m (rated), 18 N·m (peak)
COSTR. ProServo PH14
Micro Servo Joint with Harmonic Reducer
Ø 70mm; Length 77.5mm; 1108g
Rated Voltage: 24-48 V; 120W
Rated Speed: 58 rpm / 30 rpm
Rated Torque: 18 Nm / 22 Nm
Reduction Ratio: 51:1 / 101:1
COSTR. ProServo PH17
Micro Servo Joint with Harmonic Reducer
Ø 80mm; Length 88.3mm; 1350g
Rated Voltage: 24-48 V; 130W
Rated Speed: 58 rpm / 30 rpm
Rated Torque: 30 Nm / 38 Nm
Reduction Ratio: 51:1 / 101:1
COSTR. ProServo PH25
Micro Servo Joint with Harmonic Reducer
Ø 110mm; Length 98.5mm; 3098g
Rated Voltage: 24-48 V; 500W
Rated Speed: 30 rpm / 24 rpm
Rated Torque: 96 Nm / 144 Nm
Reduction Ratio: 81:1 / 101:1