Ti5 Robot CRA-RI70-80-PRO-S-XX Integrated Robot Joint Module (Harmonic, 500W, 17-bit, Hollow-Shaft Ø15, CAN/EtherCAT, IP65, 51–102:1)

Overview

Ti5 Robot CRA-RI70-80-PRO-S-XX is a compact, high-torque integrated robot joint module built around a harmonic reducer and a 500 W permanent-magnet servo. It pairs a hollow-shaft design (Ø15 mm) with IP65 protection and optional single/dual magnetic encoders, giving precise position control through CAN or EtherCAT. With multiple ratios (51/81/101/102:1), rated output torque up to 50 N·m and peak up to 108 N·m, this robot joint module delivers a high load-to-weight ratio for humanoids, collaborative arms, exoskeletons, gimbals and mobile robots.

Key Features

• Harmonic-drive integrated joint with 500 W servo, compact Ø75 mm body.

• Multiple ratios: 51, 81, 101 and 102:1 to balance speed and torque.

• Precision sensing: 17-bit magnetic encoder; single or dual encoder options (motor-side + joint-side).

• Industrial buses: CAN standard; EtherCAT available.

• Hollow shaft Ø15 mm for cable/air-tube routing; electromagnetic brake optional.

• IP65 dust- and water-resistant enclosure.

• High efficiency drive: 24–48 VDC supply, rated 6.1 A, max continuous 8.4 A.

• Lightweight package: 0.95 kg (standard) or 1.3 kg (-B long version).

• Low backlash: 10–20 arcsec depending on ratio.

• Long pigtail: ~5 m cable for easy integration.

Specifications

Actuator & Mechanics

• Reduction ratios: 51 / 81 / 101 / 102 : 1

• Backlash (arcsec): 20 / 20 / 10 / 10

• Hollow shaft (through-hole): Ø15 mm

• Pole pairs: 10

• Protection: IP65

• Mounting: bolt-circle flange (screw installation); threaded hole pattern per drawing

Electrical

• Motor power: 500 W

• Supply voltage: 24–48 VDC

• Rated current: 6.1 A; Max continuous current: 8.4 A

• Phase resistance: 0.38 Ω

• Inductance: ≈0.33 mH

• Torque constant (Nm/A): ≈0.118 (standard), ≈0.13 (-B)

• Encoder: 17-bit magnetic, single or dual

• Communication: CAN (standard), EtherCAT (option)

Dimensions & Mass (from drawings)

• Outer diameter: ≈Ø75 mm

• Length: 71.4 ± 0.5 mm (CRA-RI70-80-PRO-S-XX)

• Length (long version): 96.9 ± 0.5 mm (CRA-RI70-80-PRO-S-XX-B)

• Weight: 0.95 kg (standard) / 1.3 kg (-B)

• Rotor inertia (g·cm²): ≈569 (standard) / ≈679 (-B)

• Cable length: ≈5 m

Output Performance by Ratio
(output side; values taken from the data images)

Environmental

• Operating temperature: up to ≈60 °C (per sheet)

Options

• Single / Dual encoder

• With / Without brake

• CAN or EtherCAT

Notes: Dimensions and ratings above are read from the supplied specification images/drawings for CRA-RI70-80-PRO-S-XX and the longer -B variant. Choose ratio/encoder/bus/brake according to your control system and load case.

Applications

• Humanoid robots (hip/knee/ankle, shoulder/elbow joints)

• Collaborative & industrial robotic arms

• Exoskeletons and rehabilitation devices

• UAV/UGV gimbals and stabilized platforms

• Mobile robots/AGVs/AMRs steering or articulation joints

• Automation fixtures and positioning stages

• Marine/vehicle mechanisms requiring compact, sealed joints

Details

Harmonic joint module CRA-RI70-80-PRO-S-XX with 500W motor, 24–48V power, CAN communication, high-precision encoder, and specs for torque, speed, and electrical performance.

CRA-RI70-80-PRO-S-XX-B harmonic drive module with 51-102 reduction ratios, 63-108 N.m peak torque, 500W motor, 24-48V supply, CAN bus, 17 CPR encoder, and 679 g*cm² inertia.