CPM-80-25 Integrated Cycloidal Joint Module¶
Product Overview¶
CPM-80-25 is a compact robot joint module using an integrated cycloidal pinwheel transmission. The no-driver configuration uses an 80 mm maximum outer diameter and 29.7 mm axial thickness; the current integrated-driver reference configuration is 41.2 mm thick. The 25:1 transmission is intended for compact robot joints requiring moderate continuous torque and short-duration peak torque.
The product can be supplied with or without an integrated driver. Driver, encoder, communication and closed-loop control functions apply only to the configuration confirmed in the quotation.
Engineering Evaluation Fast Track¶
CPM-80-25 has released public resources for early mechanical and performance evaluation, including simplified STEP models, a mechanical-interface reference and measured performance data.
If the required torque, speed, diameter, thickness, motor, output interface or electronics does not match CPM-80-25 exactly, use the module as a cycloidal reference platform and start a custom transmission review.
View CPM-80-25 Engineering Resources Custom Cycloidal Transmission Engineering Request Engineering Review
The image above shows the version without an integrated driver.
Product Identity¶
| Item | Description |
|---|---|
| Model | CPM-80-25 |
| Product type | Integrated cycloidal robot joint module |
| Transmission | Cycloidal pinwheel |
| Main material | Steel |
| Driver configuration | With or without integrated driver |
Key Benefits¶
- Compact 80 mm outer diameter
- 29.7 mm axial profile without integrated driver
- 41.2 mm axial profile for the current integrated-driver reference configuration
- 10 Nm rated output torque
- 50 Nm peak output torque
- 120 rpm rated output speed
- 5-10 arcmin backlash
- 24-48 VDC operating range
- Optional integrated control configuration
Key Specifications¶
| Parameter | Value |
|---|---|
| Transmission structure | Cycloidal pinwheel |
| Outer diameter | 80 mm |
| Product thickness - no driver | 29.7 mm |
| Product thickness - integrated driver reference | 41.2 mm |
| Reduction ratio | 25:1 |
| Backlash | 5-10 arcmin |
| Operating voltage | 24-48 VDC |
| Rated motor power | 500 W |
| Rated output speed | 120 rpm |
| No-load output speed | 168 rpm |
| Rated output torque | 10 Nm |
| Peak output torque | 50 Nm |
| Weight - no driver | 430 g |
| Weight - integrated driver reference | 512 g |
| Allowable radial force | 500 N |
| Allowable axial force | 500 N |
Configuration Comparison¶
| Configuration | Max. OD | Axial thickness | Weight | Public CAD |
|---|---|---|---|---|
| No integrated driver | 80 mm | 29.7 mm | 430 g | Available |
| Current integrated-driver reference | 80 mm | 41.2 mm | 512 g | Available |
The integrated-driver dimensions above correspond to the currently released reference outline. Future driver or encoder variants may use a different rear housing, connector arrangement or total thickness and should be confirmed against the quoted configuration.
Peak Torque Condition¶
Peak torque: 50 Nm
Peak duration depends on operating voltage, current limit, duty cycle and thermal conditions. Confirm the required peak-torque duration with SigGear before selection.
Motor and Electrical Parameters¶
| Parameter | Value |
|---|---|
| Motor KV value | 104 rpm/V |
| Thermistor | 10 kOhm, B3435, +/-1% |
| Phase inductance | 235 uH |
| Phase current full scale | 33 A |
| Rated bus current | 12 A |
| Static working bus current | 0.08 A |
| Motor structure | 18 slots / 20 poles |
| Phase resistance | 224 uOhm |
| NTC B value | 3435 |
| Back-EMF constant | 0.0727 Vs/rad |
Driver and Encoder Configuration¶
Two representative configurations are shown on this page:
- Without integrated driver: motor, cycloidal transmission and Hall-sensor wiring are supplied as a mechanical and motor assembly.
- With integrated driver: the current released reference outline is 80 mm maximum OD, 41.2 mm axial thickness and 512 g. Driver, encoder, connector and firmware details remain configuration-dependent.
Encoder, communication, closed-loop control, connector and cable details must be confirmed in the quotation and technical agreement.
Communication and Control¶
For a driver-equipped configuration, available communication and control functions are confirmed according to the selected driver and project requirements.
Possible project configurations may include:
- CAN communication
- RS485 communication
- Position control
- Velocity control
- Torque control
- PID closed-loop control
Final functions, protocol details and control limits must be confirmed in the quotation and technical agreement.
Mechanical Load Capacity¶
| Parameter | Value |
|---|---|
| Allowable radial force | 500 N |
| Allowable axial force | 500 N |
The suitability of the joint module for external radial and axial loads depends on the installation geometry, load direction, speed and duty cycle.
Standard Mechanical Configuration¶
The standard mechanical assembly includes:
- BLDC motor
- Cycloidal pinwheel reduction mechanism
- Housing and output structure
Electrical and control components depend on the selected configuration.
Optional Configuration¶
- Integrated driver
- Encoder and sensor configuration
- CAN or RS485 communication
- Custom cables and connectors
- Custom mechanical interfaces
- Customer branding and labeling
What Is Not Automatically Included¶
Unless specifically stated in the quotation, the following are not automatically included:
- External power supply
- Host controller
- Communication adapter
- Application-specific mounting hardware
- Detailed production drawing or internal assembly documentation
- Noise-test report
- Service-life report
Recommended Applications¶
- Humanoid robot joints
- Quadruped robot joints
- Compact robotic arms
- Exoskeleton joints
- Rehabilitation robots
- Research and education platforms
Product Images¶
| Version without integrated driver | Version with integrated driver |
|---|---|
|
 |
The images show representative mechanical configurations. The version without an integrated driver includes the motor and cycloidal transmission assembly with its sensor wiring. The driver-equipped version uses a different rear housing and interface arrangement. Final driver, encoder, connector, cable, communication and control functions must be confirmed in the quotation.
Engineering Resources¶
The following CPM-80-25 v1.0 public engineering resources are approved for engineering evaluation and early mechanical design-in:
View Technical Datasheet v1.0 Download STEP - No Driver Download STEP - Integrated Driver View Mechanical Interface v1.0 View Measured Performance Data
The public STEP models are simplified external-interface models for packaging, mounting and early design-in. Internal cycloidal geometry, bearings, motor internals, PCB details and proprietary assembly construction are not included.
For final tooling or production release, request the controlled drawing for the exact ordered configuration.
Evaluation and Design-In¶
Custom Cycloidal Transmission Engineering Sample Validation Workflow Design-In Checklist
Selection Information Required¶
Please provide:
- Application and installation position
- Rated and peak torque
- Required peak-torque duration
- Required output speed
- Operating voltage
- Size and weight limits
- Duty cycle
- External radial and axial loads
- Driver and encoder requirement
- Communication interface
- Estimated prototype and annual quantity
Related Selection and Application Guides¶
Robot Joint Actuator and Gearbox Selection Guide Humanoid Robot Joint Actuators and Gearboxes Robotic Arm Joint Actuators and Gearboxes Exoskeleton Joint Actuators and Gearboxes Request CAD, Sample and Quote
Contact SigGear¶
Wanrong Wang
International Sales, SigGear
wangwanrong@siggear.com